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fune/dom/base/nsContentUtils.h

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/* A namespace class for static content utilities. */
#ifndef nsContentUtils_h___
#define nsContentUtils_h___
#if defined(XP_WIN)
#include <float.h>
#endif
#if defined(SOLARIS)
#include <ieeefp.h>
#endif
#include "js/TypeDecls.h"
#include "js/Value.h"
#include "js/RootingAPI.h"
#include "mozilla/dom/FromParser.h"
#include "mozilla/BasicEvents.h"
#include "mozilla/CORSMode.h"
#include "mozilla/EventForwards.h"
#include "mozilla/GuardObjects.h"
#include "mozilla/TaskCategory.h"
#include "mozilla/TimeStamp.h"
#include "nsContentListDeclarations.h"
#include "nsMathUtils.h"
#include "nsTArrayForwardDeclare.h"
#include "Units.h"
#include "mozilla/dom/AutocompleteInfoBinding.h"
#include "mozilla/dom/BindingDeclarations.h" // For CallerType
#include "mozilla/dom/ScriptSettings.h"
#include "mozilla/FloatingPoint.h"
#include "mozilla/intl/LineBreaker.h"
#include "mozilla/intl/WordBreaker.h"
#include "mozilla/net/ReferrerPolicy.h"
#include "mozilla/Logging.h"
#include "mozilla/NotNull.h"
#include "mozilla/Maybe.h"
#include "mozilla/RangeBoundary.h"
#include "nsIContentPolicy.h"
#include "nsIDocument.h"
#include "nsPIDOMWindow.h"
#include "nsRFPService.h"
#if defined(XP_WIN)
// Undefine LoadImage to prevent naming conflict with Windows.
#undef LoadImage
#endif
class imgICache;
class imgIContainer;
class imgINotificationObserver;
class imgIRequest;
class imgLoader;
class imgRequestProxy;
class nsAutoScriptBlockerSuppressNodeRemoved;
class nsCacheableFuncStringHTMLCollection;
class nsHtml5StringParser;
class nsAtom;
class nsIChannel;
class nsIConsoleService;
class nsIContent;
class nsIContentPolicy;
class nsIContentSecurityPolicy;
class nsIDocShellTreeItem;
class nsIDocumentLoaderFactory;
class nsIDragSession;
class nsIEventTarget;
class nsIFragmentContentSink;
class nsIFrame;
class nsIImageLoadingContent;
class nsIInterfaceRequestor;
class nsIIOService;
class nsILoadInfo;
class nsILoadGroup;
class nsNameSpaceManager;
class nsIObserver;
class nsIParser;
class nsIPluginTag;
class nsIPresShell;
class nsIPrincipal;
class nsIRequest;
class nsIRunnable;
class nsIScriptContext;
class nsIScriptSecurityManager;
class nsIStringBundle;
class nsIStringBundleService;
class nsISupportsHashKey;
class nsIURI;
class nsIUUIDGenerator;
class nsIWidget;
class nsIXPConnect;
class nsNodeInfoManager;
class nsPIDOMWindowInner;
class nsPIDOMWindowOuter;
class nsPresContext;
class nsStringBuffer;
class nsStringHashKey;
class nsTextFragment;
class nsView;
class nsViewportInfo;
class nsWrapperCache;
class nsAttrValue;
class nsITransferable;
class nsPIWindowRoot;
class nsIWindowProvider;
struct JSRuntime;
template<class E> class nsCOMArray;
template<class K, class V> class nsDataHashtable;
template<class K, class V> class nsRefPtrHashtable;
template<class T> class nsReadingIterator;
namespace mozilla {
class Dispatcher;
class ErrorResult;
class EventListenerManager;
class HTMLEditor;
namespace dom {
struct CustomElementDefinition;
class DocumentFragment;
class Element;
class Event;
class EventTarget;
class HTMLInputElement;
class IPCDataTransfer;
class IPCDataTransferItem;
struct LifecycleCallbackArgs;
struct LifecycleAdoptedCallbackArgs;
class MessageBroadcaster;
class NodeInfo;
class nsIContentChild;
class nsIContentParent;
class TabChild;
class Selection;
class TabParent;
} // namespace dom
namespace ipc {
class Shmem;
class IShmemAllocator;
}
namespace gfx {
class DataSourceSurface;
} // namespace gfx
namespace layers {
class LayerManager;
} // namespace layers
} // namespace mozilla
class nsIBidiKeyboard;
extern const char kLoadAsData[];
// Stolen from nsReadableUtils, but that's OK, since we can declare the same
// name multiple times.
const nsString& EmptyString();
const nsCString& EmptyCString();
enum EventNameType {
EventNameType_None = 0x0000,
EventNameType_HTML = 0x0001,
EventNameType_XUL = 0x0002,
EventNameType_SVGGraphic = 0x0004, // svg graphic elements
EventNameType_SVGSVG = 0x0008, // the svg element
EventNameType_SMIL = 0x0010, // smil elements
EventNameType_HTMLBodyOrFramesetOnly = 0x0020,
EventNameType_HTMLXUL = 0x0003,
EventNameType_All = 0xFFFF
};
struct EventNameMapping
{
// This holds pointers to nsGkAtoms members, and is therefore safe as a
// non-owning reference.
nsAtom* MOZ_NON_OWNING_REF mAtom;
int32_t mType;
mozilla::EventMessage mMessage;
mozilla::EventClassID mEventClassID;
// True if mAtom is possibly used by special SVG/SMIL events, but
// mMessage is eUnidentifiedEvent. See EventNameList.h
bool mMaybeSpecialSVGorSMILEvent;
};
typedef bool (*CallOnRemoteChildFunction) (mozilla::dom::TabParent* aTabParent,
void* aArg);
class nsContentUtils
{
friend class nsAutoScriptBlockerSuppressNodeRemoved;
typedef mozilla::dom::Element Element;
typedef mozilla::Cancelable Cancelable;
typedef mozilla::CanBubble CanBubble;
typedef mozilla::ChromeOnlyDispatch ChromeOnlyDispatch;
typedef mozilla::EventMessage EventMessage;
typedef mozilla::TimeDuration TimeDuration;
typedef mozilla::Trusted Trusted;
public:
static nsresult Init();
// Strip off "wyciwyg://n/" part of a URL. aURI must have "wyciwyg" scheme.
static nsresult RemoveWyciwygScheme(nsIURI* aURI, nsIURI** aReturn);
static bool IsCallerChrome();
static bool ThreadsafeIsCallerChrome();
static bool IsCallerContentXBL();
// The APIs for checking whether the caller is system (in the sense of system
// principal) should only be used when the JSContext is known to accurately
// represent the caller. In practice, that means you should only use them in
// two situations at the moment:
//
// 1) Functions used in WebIDL Func annotations.
// 2) Bindings code or other code called directly from the JS engine.
//
// Use pretty much anywhere else is almost certainly wrong and should be
// replaced with [NeedsCallerType] annotations in bindings.
// Check whether the caller is system if you know you're on the main thread.
static bool IsSystemCaller(JSContext* aCx);
// Check whether the caller is system if you might be on a worker or worklet
// thread.
static bool ThreadsafeIsSystemCaller(JSContext* aCx);
// In the traditional Gecko architecture, both C++ code and untrusted JS code
// needed to rely on the same XPCOM method/getter/setter to get work done.
// This required lots of security checks in the various exposed methods, which
// in turn created difficulty in determining whether the caller was script
// (whose access needed to be checked) and internal C++ platform code (whose
// access did not need to be checked). To address this problem, Gecko had a
// convention whereby the absence of script on the stack was interpretted as
// "System Caller" and always granted unfettered access.
//
// Unfortunately, this created a bunch of footguns. For example, when the
// implementation of a DOM method wanted to perform a privileged
// sub-operation, it needed to "hide" the presence of script on the stack in
// order for that sub-operation to be allowed. Additionally, if script could
// trigger an API entry point to be invoked in some asynchronous way without
// script on the stack, it could potentially perform privilege escalation.
//
// In the modern world, untrusted script should interact with the platform
// exclusively over WebIDL APIs, and platform code has a lot more flexibility
// in deciding whether or not to use XPCOM. This gives us the flexibility to
// do something better.
//
// Going forward, APIs should be designed such that any security checks that
// ask the question "is my caller allowed to do this?" should live in WebIDL
// API entry points, with a separate method provided for internal callers
// that just want to get the job done.
//
// To enforce this and catch bugs, nsContentUtils::SubjectPrincipal will crash
// if it is invoked without script on the stack. To land that transition, it
// was necessary to go through and whitelist a bunch of callers that were
// depending on the old behavior. Those callers should be fixed up, and these
// methods should not be used by new code without review from bholley or bz.
static bool LegacyIsCallerNativeCode() { return !GetCurrentJSContext(); }
static bool LegacyIsCallerChromeOrNativeCode() { return LegacyIsCallerNativeCode() || IsCallerChrome(); }
static nsIPrincipal* SubjectPrincipalOrSystemIfNativeCaller()
{
if (!GetCurrentJSContext()) {
return GetSystemPrincipal();
}
return SubjectPrincipal();
}
static bool LookupBindingMember(JSContext* aCx, nsIContent *aContent,
JS::Handle<jsid> aId,
JS::MutableHandle<JS::PropertyDescriptor> aDesc);
// Check whether we should avoid leaking distinguishing information to JS/CSS.
// This function can be called both in the main thread and worker threads.
static bool ShouldResistFingerprinting();
static bool ShouldResistFingerprinting(nsIDocShell* aDocShell);
static bool ShouldResistFingerprinting(nsIDocument* aDoc);
// A helper function to calculate the rounded window size for fingerprinting
// resistance. The rounded size is based on the chrome UI size and available
// screen size. If the inputWidth/Height is greater than the available content
// size, this will report the available content size. Otherwise, it will
// round the size to the nearest upper 200x100.
static void CalcRoundedWindowSizeForResistingFingerprinting(int32_t aChromeWidth,
int32_t aChromeHeight,
int32_t aScreenWidth,
int32_t aScreenHeight,
int32_t aInputWidth,
int32_t aInputHeight,
bool aSetOuterWidth,
bool aSetOuterHeight,
int32_t* aOutputWidth,
int32_t* aOutputHeight);
/**
* Returns the parent node of aChild crossing document boundaries.
* Uses the parent node in the composed document.
*/
static nsINode* GetCrossDocParentNode(nsINode* aChild);
/**
* Do not ever pass null pointers to this method. If one of your
* nsIContents is null, you have to decide for yourself what
* "IsDescendantOf" really means.
*
* @param aPossibleDescendant node to test for being a descendant of
* aPossibleAncestor
* @param aPossibleAncestor node to test for being an ancestor of
* aPossibleDescendant
* @return true if aPossibleDescendant is a descendant of
* aPossibleAncestor (or is aPossibleAncestor). false
* otherwise.
*/
static bool ContentIsDescendantOf(const nsINode* aPossibleDescendant,
const nsINode* aPossibleAncestor);
/**
* Similar to ContentIsDescendantOf, except will treat an HTMLTemplateElement
* or ShadowRoot as an ancestor of things in the corresponding DocumentFragment.
* See the concept of "host-including inclusive ancestor" in the DOM
* specification.
*/
static bool ContentIsHostIncludingDescendantOf(
const nsINode* aPossibleDescendant, const nsINode* aPossibleAncestor);
/**
* Similar to above, but does special case only ShadowRoot,
* not HTMLTemplateElement.
*/
static bool ContentIsShadowIncludingDescendantOf(
const nsINode* aPossibleDescendant, const nsINode* aPossibleAncestor);
/**
* Similar to ContentIsDescendantOf except it crosses document boundaries,
* this function uses ancestor/descendant relations in the composed document
* (see shadow DOM spec).
*/
static bool ContentIsCrossDocDescendantOf(nsINode* aPossibleDescendant,
nsINode* aPossibleAncestor);
/**
* As with ContentIsCrossDocDescendantOf but crosses shadow boundaries but not
* cross document boundaries.
*
* @see nsINode::GetFlattenedTreeParentNode()
*/
static bool
ContentIsFlattenedTreeDescendantOf(const nsINode* aPossibleDescendant,
const nsINode* aPossibleAncestor);
/**
* Same as `ContentIsFlattenedTreeDescendantOf`, but from the flattened tree
* point of view of the style system
*
* @see nsINode::GetFlattenedTreeParentNodeForStyle()
*/
static bool
ContentIsFlattenedTreeDescendantOfForStyle(const nsINode* aPossibleDescendant,
const nsINode* aPossibleAncestor);
/**
* Retarget an object A against an object B
* @see https://dom.spec.whatwg.org/#retarget
*/
static nsINode*
Retarget(nsINode* aTargetA, nsINode* aTargetB);
/*
* This method fills the |aArray| with all ancestor nodes of |aNode|
* including |aNode| at the zero index.
*/
static nsresult GetAncestors(nsINode* aNode,
nsTArray<nsINode*>& aArray);
/*
* This method fills |aAncestorNodes| with all ancestor nodes of |aNode|
* including |aNode| (QI'd to nsIContent) at the zero index.
* For each ancestor, there is a corresponding element in |aAncestorOffsets|
* which is the IndexOf the child in relation to its parent.
*
* This method just sucks.
*/
static nsresult GetAncestorsAndOffsets(nsINode* aNode,
int32_t aOffset,
nsTArray<nsIContent*>* aAncestorNodes,
nsTArray<int32_t>* aAncestorOffsets);
/**
* Returns the common ancestor, if any, for two nodes.
*
* Returns null if the nodes are disconnected.
*/
static nsINode* GetCommonAncestor(nsINode* aNode1, nsINode* aNode2)
{
if (aNode1 == aNode2) {
return aNode1;
}
return GetCommonAncestorHelper(aNode1, aNode2);
}
/**
* Returns the common flattened tree ancestor, if any, for two given content
* nodes.
*/
static nsIContent* GetCommonFlattenedTreeAncestor(nsIContent* aContent1,
nsIContent* aContent2)
{
if (aContent1 == aContent2) {
return aContent1;
}
return GetCommonFlattenedTreeAncestorHelper(aContent1, aContent2);
}
/**
* Returns the common flattened tree ancestor from the point of view of the
* style system, if any, for two given content nodes.
*/
static Element* GetCommonFlattenedTreeAncestorForStyle(
Element* aElement1, Element* aElement2);
/**
* Returns true if aNode1 is before aNode2 in the same connected
* tree.
*/
static bool PositionIsBefore(nsINode* aNode1, nsINode* aNode2);
/**
* Utility routine to compare two "points", where a point is a
* node/offset pair
* Returns -1 if point1 < point2, 1, if point1 > point2,
* 0 if error or if point1 == point2.
* NOTE! If the two nodes aren't in the same connected subtree,
* the result is 1, and the optional aDisconnected parameter
* is set to true.
*
* XXX aOffset1 and aOffset2 should be uint32_t since valid offset value is
* between 0 - UINT32_MAX. However, these methods work even with
* negative offset values! E.g., when aOffset1 is -1 and aOffset is 0,
* these methods return -1. Some root callers depend on this behavior.
* On the other hand, nsINode can have ATTRCHILD_ARRAY_MAX_CHILD_COUN
* (0x3FFFFF) at most. Therefore, they can be int32_t for now.
*/
static int32_t ComparePoints(nsINode* aParent1, int32_t aOffset1,
nsINode* aParent2, int32_t aOffset2,
bool* aDisconnected = nullptr);
static int32_t ComparePoints(const mozilla::RawRangeBoundary& aFirst,
const mozilla::RawRangeBoundary& aSecond,
bool* aDisconnected = nullptr);
/**
* Brute-force search of the element subtree rooted at aContent for
* an element with the given id. aId must be nonempty, otherwise
* this method may return nodes even if they have no id!
*/
static Element* MatchElementId(nsIContent *aContent, const nsAString& aId);
/**
* Similar to above, but to be used if one already has an atom for the ID
*/
static Element* MatchElementId(nsIContent *aContent, const nsAtom* aId);
/**
* Reverses the document position flags passed in.
*
* @param aDocumentPosition The document position flags to be reversed.
*
* @return The reversed document position flags.
*
* @see Node
*/
static uint16_t ReverseDocumentPosition(uint16_t aDocumentPosition);
/**
* Returns a subdocument for aDocument with a particular outer window ID.
*
* @param aDocument
* The document whose subdocuments will be searched.
* @param aOuterWindowID
* The outer window ID for the subdocument to be found. This must
* be a value greater than 0.
* @return nsIDocument*
* A pointer to the found nsIDocument. nullptr if the subdocument
* cannot be found, or if either aDocument or aOuterWindowId were
* invalid. If the outer window ID belongs to aDocument itself, this
* will return a pointer to aDocument.
*/
static nsIDocument* GetSubdocumentWithOuterWindowId(nsIDocument *aDocument,
uint64_t aOuterWindowId);
static const nsDependentSubstring TrimCharsInSet(const char* aSet,
const nsAString& aValue);
template<bool IsWhitespace(char16_t)>
static const nsDependentSubstring TrimWhitespace(const nsAString& aStr,
bool aTrimTrailing = true);
/**
* Returns true if aChar is of class Ps, Pi, Po, Pf, or Pe.
*/
static bool IsFirstLetterPunctuation(uint32_t aChar);
static bool IsFirstLetterPunctuationAt(const nsTextFragment* aFrag, uint32_t aOffset);
/**
* Returns true if aChar is of class Lu, Ll, Lt, Lm, Lo, Nd, Nl or No
*/
static bool IsAlphanumeric(uint32_t aChar);
static bool IsAlphanumericAt(const nsTextFragment* aFrag, uint32_t aOffset);
/*
* Is the character an HTML whitespace character?
*
* We define whitespace using the list in HTML5 and css3-selectors:
* U+0009, U+000A, U+000C, U+000D, U+0020
*
* HTML 4.01 also lists U+200B (zero-width space).
*/
static bool IsHTMLWhitespace(char16_t aChar);
/*
* Returns whether the character is an HTML whitespace (see IsHTMLWhitespace)
* or a nbsp character (U+00A0).
*/
static bool IsHTMLWhitespaceOrNBSP(char16_t aChar);
/**
* Is the HTML local name a block element?
*/
static bool IsHTMLBlock(nsIContent* aContent);
enum ParseHTMLIntegerResultFlags {
eParseHTMLInteger_NoFlags = 0,
eParseHTMLInteger_IsPercent = 1 << 0,
// eParseHTMLInteger_NonStandard is set if the string representation of the
// integer was not the canonical one (e.g. had extra leading '+' or '0').
eParseHTMLInteger_NonStandard = 1 << 1,
eParseHTMLInteger_DidNotConsumeAllInput = 1 << 2,
// Set if one or more error flags were set.
eParseHTMLInteger_Error = 1 << 3,
eParseHTMLInteger_ErrorNoValue = 1 << 4,
eParseHTMLInteger_ErrorOverflow = 1 << 5,
// Use this flag to detect the difference between overflow and underflow
eParseHTMLInteger_Negative = 1 << 6,
};
static int32_t ParseHTMLInteger(const nsAString& aValue,
ParseHTMLIntegerResultFlags *aResult);
/**
* Parse a margin string of format 'top, right, bottom, left' into
* an nsIntMargin.
*
* @param aString the string to parse
* @param aResult the resulting integer
* @return whether the value could be parsed
*/
static bool ParseIntMarginValue(const nsAString& aString, nsIntMargin& aResult);
/**
* Parse the value of the <font size=""> attribute according to the HTML5
* spec as of April 16, 2012.
*
* @param aValue the value to parse
* @return 1 to 7, or 0 if the value couldn't be parsed
*/
static int32_t ParseLegacyFontSize(const nsAString& aValue);
static void Shutdown();
/**
* Checks whether two nodes come from the same origin.
*/
static nsresult CheckSameOrigin(const nsINode* aTrustedNode,
const nsINode* unTrustedNode);
// Check if the (JS) caller can access aNode.
static bool CanCallerAccess(nsINode* aNode);
// Check if the (JS) caller can access aWindow.
// aWindow can be either outer or inner window.
static bool CanCallerAccess(nsPIDOMWindowInner* aWindow);
// Check if the principal is chrome or an addon with the permission.
static bool PrincipalHasPermission(nsIPrincipal* aPrincipal, const nsAtom* aPerm);
// Check if the JS caller is chrome or an addon with the permission.
static bool CallerHasPermission(JSContext* aCx, const nsAtom* aPerm);
/**
* Returns the triggering principal which should be used for the given URL
* attribute value with the given subject principal.
*
* If the attribute value is not an absolute URL, the subject principal will
* be ignored, and the node principal of aContent will be used instead.
* If aContent is non-null, this function will always return a principal.
* Otherewise, it may return null if aSubjectPrincipal is null or is rejected
* based on the attribute value.
*
* @param aContent The content on which the attribute is being set.
* @param aAttrValue The URL value of the attribute. For parsed attribute
* values, such as `srcset`, this function should be called separately
* for each URL value it contains.
* @param aSubjectPrincipal The subject principal of the scripted caller
* responsible for setting the attribute, or null if no scripted caller
* can be determined.
*/
static nsIPrincipal* GetAttrTriggeringPrincipal(nsIContent* aContent,
const nsAString& aAttrValue,
nsIPrincipal* aSubjectPrincipal);
/**
* Returns true if the given string is guaranteed to be treated as an absolute
* URL, rather than a relative URL. In practice, this means any complete URL
* as supported by nsStandardURL, or any string beginning with a valid scheme
* which is known to the IO service, and has the URI_NORELATIVE flag.
*
* If the URL may be treated as absolute in some cases, but relative in others
* (for instance, "http:foo", which can be either an absolute or relative URL,
* depending on the context), this function returns false.
*/
static bool IsAbsoluteURL(const nsACString& aURL);
// Check if a node is in the document prolog, i.e. before the document
// element.
static bool InProlog(nsINode *aNode);
static nsNameSpaceManager* NameSpaceManager()
{
return sNameSpaceManager;
}
static nsIIOService* GetIOService()
{
return sIOService;
}
static nsIBidiKeyboard* GetBidiKeyboard();
/**
* Get the cache security manager service. Can return null if the layout
* module has been shut down.
*/
static nsIScriptSecurityManager* GetSecurityManager()
{
return sSecurityManager;
}
// Returns the subject principal from the JSContext. May only be called
// from the main thread and assumes an existing compartment.
static nsIPrincipal* SubjectPrincipal(JSContext* aCx);
// Returns the subject principal. Guaranteed to return non-null. May only
// be called when nsContentUtils is initialized.
static nsIPrincipal* SubjectPrincipal();
// Returns the prinipal of the given JS object. This may only be called on
// the main thread for objects from the main thread's JSRuntime.
static nsIPrincipal* ObjectPrincipal(JSObject* aObj);
static nsresult GenerateStateKey(nsIContent* aContent,
nsIDocument* aDocument,
nsACString& aKey);
/**
* Create a new nsIURI from aSpec, using aBaseURI as the base. The
* origin charset of the new nsIURI will be the document charset of
* aDocument.
*/
static nsresult NewURIWithDocumentCharset(nsIURI** aResult,
const nsAString& aSpec,
nsIDocument* aDocument,
nsIURI* aBaseURI);
/**
* Returns true if |aName| is a name with dashes.
*/
static bool IsNameWithDash(nsAtom* aName);
/**
* Returns true if |aName| is a valid name to be registered via
* customElements.define.
*/
static bool IsCustomElementName(nsAtom* aName, uint32_t aNameSpaceID);
static nsresult CheckQName(const nsAString& aQualifiedName,
bool aNamespaceAware = true,
const char16_t** aColon = nullptr);
static nsresult SplitQName(const nsIContent* aNamespaceResolver,
const nsString& aQName,
int32_t *aNamespace, nsAtom **aLocalName);
static nsresult GetNodeInfoFromQName(const nsAString& aNamespaceURI,
const nsAString& aQualifiedName,
nsNodeInfoManager* aNodeInfoManager,
uint16_t aNodeType,
mozilla::dom::NodeInfo** aNodeInfo);
static void SplitExpatName(const char16_t *aExpatName, nsAtom **aPrefix,
nsAtom **aTagName, int32_t *aNameSpaceID);
// Get a permission-manager setting for the given principal and type.
// If the pref doesn't exist or if it isn't ALLOW_ACTION, false is
// returned, otherwise true is returned. Always returns true for the
// system principal, and false for a null principal.
static bool IsSitePermAllow(nsIPrincipal* aPrincipal, const char* aType);
// Get a permission-manager setting for the given principal and type.
// If the pref doesn't exist or if it isn't DENY_ACTION, false is
// returned, otherwise true is returned. Always returns false for the
// system principal, and true for a null principal.
static bool IsSitePermDeny(nsIPrincipal* aPrincipal, const char* aType);
// Get a permission-manager setting for the given principal and type.
// If the pref doesn't exist or if it isn't ALLOW_ACTION, false is
// returned, otherwise true is returned. Always returns true for the
// system principal, and false for a null principal.
// This version checks the permission for an exact host match on
// the principal
static bool IsExactSitePermAllow(nsIPrincipal* aPrincipal, const char* aType);
// Get a permission-manager setting for the given principal and type.
// If the pref doesn't exist or if it isn't DENY_ACTION, false is
// returned, otherwise true is returned. Always returns false for the
// system principal, and true for a null principal.
// This version checks the permission for an exact host match on
// the principal
static bool IsExactSitePermDeny(nsIPrincipal* aPrincipal, const char* aType);
// Returns true if aDoc1 and aDoc2 have equal NodePrincipal()s.
static bool HaveEqualPrincipals(nsIDocument* aDoc1, nsIDocument* aDoc2);
static mozilla::intl::LineBreaker* LineBreaker()
{
return sLineBreaker.get();
}
static mozilla::intl::WordBreaker* WordBreaker()
{
return sWordBreaker.get();
}
/**
* Regster aObserver as a shutdown observer. A strong reference is held
* to aObserver until UnregisterShutdownObserver is called.
*/
static void RegisterShutdownObserver(nsIObserver* aObserver);
static void UnregisterShutdownObserver(nsIObserver* aObserver);
/**
* @return true if aContent has an attribute aName in namespace aNameSpaceID,
* and the attribute value is non-empty.
*/
static bool HasNonEmptyAttr(const nsIContent* aContent, int32_t aNameSpaceID,
nsAtom* aName);
/**
* Method that gets the primary presContext for the node.
*
* @param aContent The content node.
* @return the presContext, or nullptr if the content is not in a document
* (if GetComposedDoc returns nullptr)
*/
static nsPresContext* GetContextForContent(const nsIContent* aContent);
/**
* Method that gets the pres shell for the node.
*
* @param aContent The content node.
* @return the pres shell, or nullptr if the content is not in a document
* (if GetComposedDoc returns nullptr)
*/
static nsIPresShell* GetPresShellForContent(const nsIContent* aContent);
/**
* Method to do security and content policy checks on the image URI
*
* @param aURI uri of the image to be loaded
* @param aNode, the context the image is loaded in (eg an element)
* @param aLoadingDocument the document we belong to
* @param aLoadingPrincipal the principal doing the load
* @param [aContentPolicyType=nsIContentPolicy::TYPE_INTERNAL_IMAGE] (Optional)
* The CP content type to use
* @param aImageBlockingStatus the nsIContentPolicy blocking status for this
* image. This will be set even if a security check fails for the
* image, to some reasonable REJECT_* value. This out param will only
* be set if it's non-null.
* @return true if the load can proceed, or false if it is blocked.
* Note that aImageBlockingStatus, if set will always be an ACCEPT
* status if true is returned and always be a REJECT_* status if
* false is returned.
*/
static bool CanLoadImage(nsIURI* aURI,
nsINode* aNode,
nsIDocument* aLoadingDocument,
nsIPrincipal* aLoadingPrincipal);
/**
* Returns true if objects in aDocument shouldn't initiate image loads.
*/
static bool DocumentInactiveForImageLoads(nsIDocument* aDocument);
/**
* Convert a CORSMode into the corresponding imgILoader flags for
* passing to LoadImage.
* @param aMode CORS mode to convert
* @return a bitfield suitable to bitwise OR with other nsIRequest flags
*/
static int32_t CORSModeToLoadImageFlags(mozilla::CORSMode aMode);
/**
* Method to start an image load. This does not do any security checks.
* This method will attempt to make aURI immutable; a caller that wants to
* keep a mutable version around should pass in a clone.
*
* @param aURI uri of the image to be loaded
* @param aContext element of document where the result of this request
* will be used.
* @param aLoadingDocument the document we belong to
* @param aLoadingPrincipal the principal doing the load
* @param aReferrer the referrer URI
* @param aReferrerPolicy the referrer-sending policy to use on channel
* creation
* @param aObserver the observer for the image load
* @param aLoadFlags the load flags to use. See nsIRequest
* @param [aContentPolicyType=nsIContentPolicy::TYPE_INTERNAL_IMAGE] (Optional)
* The CP content type to use
* @param aUseUrgentStartForChannel,(Optional) a flag to mark on channel if it
* is triggered by user input events.
* @return the imgIRequest for the image load
*/
static nsresult LoadImage(nsIURI* aURI,
nsINode* aContext,
nsIDocument* aLoadingDocument,
nsIPrincipal* aLoadingPrincipal,
uint64_t aRequestContextID,
nsIURI* aReferrer,
mozilla::net::ReferrerPolicy aReferrerPolicy,
imgINotificationObserver* aObserver,
int32_t aLoadFlags,
const nsAString& initiatorType,
imgRequestProxy** aRequest,
uint32_t aContentPolicyType = nsIContentPolicy::TYPE_INTERNAL_IMAGE,
bool aUseUrgentStartForChannel = false);
/**
* Obtain an image loader that respects the given document/channel's privacy status.
* Null document/channel arguments return the public image loader.
*/
static imgLoader* GetImgLoaderForDocument(nsIDocument* aDoc);
static imgLoader* GetImgLoaderForChannel(nsIChannel* aChannel,
nsIDocument* aContext);
/**
* Returns whether the given URI is in the image cache.
*/
static bool IsImageInCache(nsIURI* aURI, nsIDocument* aDocument);
/**
* Method to get an imgIContainer from an image loading content
*
* @param aContent The image loading content. Must not be null.
* @param aRequest The image request [out]
* @return the imgIContainer corresponding to the first frame of the image
*/
static already_AddRefed<imgIContainer> GetImageFromContent(nsIImageLoadingContent* aContent, imgIRequest **aRequest = nullptr);
/**
* Helper method to call imgIRequest::GetStaticRequest.
*/
static already_AddRefed<imgRequestProxy> GetStaticRequest(nsIDocument* aLoadingDocument,
imgRequestProxy* aRequest);
/**
* Method that decides whether a content node is draggable
*
* @param aContent The content node to test.
* @return whether it's draggable
*/
static bool ContentIsDraggable(nsIContent* aContent);
/**
* Method that decides whether a content node is a draggable image
*
* @param aContent The content node to test.
* @return whether it's a draggable image
*/
static bool IsDraggableImage(nsIContent* aContent);
/**
* Method that decides whether a content node is a draggable link
*
* @param aContent The content node to test.
* @return whether it's a draggable link
*/
static bool IsDraggableLink(const nsIContent* aContent);
/**
* Convenience method to create a new nodeinfo that differs only by prefix and
* name from aNodeInfo. The new nodeinfo's name is set to aName, and prefix is
* set to null.
*/
static nsresult QNameChanged(mozilla::dom::NodeInfo* aNodeInfo,
nsAtom* aName,
mozilla::dom::NodeInfo** aResult);
/**
* Returns the appropriate event argument names for the specified
* namespace and event name. Added because we need to switch between
* SVG's "evt" and the rest of the world's "event", and because onerror
* on window takes 5 args.
*/
static void GetEventArgNames(int32_t aNameSpaceID, nsAtom *aEventName,
bool aIsForWindow,
uint32_t *aArgCount, const char*** aArgNames);
/**
* Returns origin attributes of the document.
**/
static mozilla::OriginAttributes
GetOriginAttributes(nsIDocument* aDoc);
/**
* Returns origin attributes of the load group.
**/
static mozilla::OriginAttributes
GetOriginAttributes(nsILoadGroup* aLoadGroup);
/**
* Returns true if this document is in a Private Browsing window.
*/
static bool IsInPrivateBrowsing(nsIDocument* aDoc);
/**
* Returns true if this loadGroup uses Private Browsing.
*/
static bool IsInPrivateBrowsing(nsILoadGroup* aLoadGroup);
/**
* If aNode is not an element, return true exactly when aContent's binding
* parent is null.
*
* If aNode is an element, return true exactly when aContent's binding parent
* is the same as aNode's.
*
* This method is particularly useful for callers who are trying to ensure
* that they are working with a non-anonymous descendant of a given node. If
* aContent is a descendant of aNode, a return value of false from this
* method means that it's an anonymous descendant from aNode's point of view.
*
* Both arguments to this method must be non-null.
*/
static bool IsInSameAnonymousTree(const nsINode* aNode, const nsIContent* aContent);
/**
* Return the nsIXPConnect service.
*/
static nsIXPConnect *XPConnect()
{
return sXPConnect;
}
/**
* Report simple error message to the browser console
* @param aErrorText the error message
* @param classification Name of the module reporting error
*/
static void LogSimpleConsoleError(const nsAString& aErrorText,
const char * classification,
bool aFromPrivateWindow);
/**
* Report a non-localized error message to the error console.
* @param aErrorText the error message
* @param aErrorFlags See nsIScriptError.
* @param aCategory Name of module reporting error.
* @param aDocument Reference to the document which triggered the message.
* @param [aURI=nullptr] (Optional) URI of resource containing error.
* @param [aSourceLine=EmptyString()] (Optional) The text of the line that
contains the error (may be empty).
* @param [aLineNumber=0] (Optional) Line number within resource
containing error.
* @param [aColumnNumber=0] (Optional) Column number within resource
containing error.
If aURI is null, then aDocument->GetDocumentURI() is used.
* @param [aLocationMode] (Optional) Specifies the behavior if
error location information is omitted.
*/
enum MissingErrorLocationMode {
// Don't show location information in the error console.
eOMIT_LOCATION,
// Get location information from the currently executing script.
eUSE_CALLING_LOCATION
};
static nsresult ReportToConsoleNonLocalized(const nsAString& aErrorText,
uint32_t aErrorFlags,
const nsACString& aCategory,
const nsIDocument* aDocument,
nsIURI* aURI = nullptr,
const nsString& aSourceLine
= EmptyString(),
uint32_t aLineNumber = 0,
uint32_t aColumnNumber = 0,
MissingErrorLocationMode aLocationMode
= eUSE_CALLING_LOCATION);
/**
* Report a non-localized error message to the error console base on the
* innerWindowID.
* @param aErrorText the error message
* @param aErrorFlags See nsIScriptError.
* @param aCategory Name of module reporting error.
* @param [aInnerWindowID] Inner window ID for document which triggered the
* message.
* @param [aURI=nullptr] (Optional) URI of resource containing error.
* @param [aSourceLine=EmptyString()] (Optional) The text of the line that
contains the error (may be empty).
* @param [aLineNumber=0] (Optional) Line number within resource
containing error.
* @param [aColumnNumber=0] (Optional) Column number within resource
containing error.
If aURI is null, then aDocument->GetDocumentURI() is used.
* @param [aLocationMode] (Optional) Specifies the behavior if
error location information is omitted.
*/
static nsresult ReportToConsoleByWindowID(const nsAString& aErrorText,
uint32_t aErrorFlags,
const nsACString& aCategory,
uint64_t aInnerWindowID,
nsIURI* aURI = nullptr,
const nsString& aSourceLine
= EmptyString(),
uint32_t aLineNumber = 0,
uint32_t aColumnNumber = 0,
MissingErrorLocationMode aLocationMode
= eUSE_CALLING_LOCATION);
/**
* Report a localized error message to the error console.
* @param aErrorFlags See nsIScriptError.
* @param aCategory Name of module reporting error.
* @param aDocument Reference to the document which triggered the message.
* @param aFile Properties file containing localized message.
* @param aMessageName Name of localized message.
* @param [aParams=nullptr] (Optional) Parameters to be substituted into
localized message.
* @param [aParamsLength=0] (Optional) Length of aParams.
* @param [aURI=nullptr] (Optional) URI of resource containing error.
* @param [aSourceLine=EmptyString()] (Optional) The text of the line that
contains the error (may be empty).
* @param [aLineNumber=0] (Optional) Line number within resource
containing error.
* @param [aColumnNumber=0] (Optional) Column number within resource
containing error.
If aURI is null, then aDocument->GetDocumentURI() is used.
*/
enum PropertiesFile {
eCSS_PROPERTIES,
eXBL_PROPERTIES,
eXUL_PROPERTIES,
eLAYOUT_PROPERTIES,
eFORMS_PROPERTIES,
ePRINTING_PROPERTIES,
eDOM_PROPERTIES,
eHTMLPARSER_PROPERTIES,
eSVG_PROPERTIES,
eBRAND_PROPERTIES,
eCOMMON_DIALOG_PROPERTIES,
eMATHML_PROPERTIES,
eSECURITY_PROPERTIES,
eNECKO_PROPERTIES,
PropertiesFile_COUNT
};
static nsresult ReportToConsole(uint32_t aErrorFlags,
const nsACString& aCategory,
const nsIDocument* aDocument,
PropertiesFile aFile,
const char *aMessageName,
const char16_t **aParams = nullptr,
uint32_t aParamsLength = 0,
nsIURI* aURI = nullptr,
const nsString& aSourceLine
= EmptyString(),
uint32_t aLineNumber = 0,
uint32_t aColumnNumber = 0);
static void ReportEmptyGetElementByIdArg(const nsIDocument* aDoc);
static void LogMessageToConsole(const char* aMsg);
/**
* Get the localized string named |aKey| in properties file |aFile|.
*/
static nsresult GetLocalizedString(PropertiesFile aFile,
const char* aKey,
nsAString& aResult);
/**
* A helper function that parses a sandbox attribute (of an <iframe> or a CSP
* directive) and converts it to the set of flags used internally.
*
* @param aSandboxAttr the sandbox attribute
* @return the set of flags (SANDBOXED_NONE if aSandboxAttr is
* null)
*/
static uint32_t ParseSandboxAttributeToFlags(const nsAttrValue* aSandboxAttr);
/**
* A helper function that checks if a string matches a valid sandbox flag.
*
* @param aFlag the potential sandbox flag.
* @return true if the flag is a sandbox flag.
*/
static bool IsValidSandboxFlag(const nsAString& aFlag);
/**
* A helper function that returns a string attribute corresponding to the
* sandbox flags.
*
* @param aFlags the sandbox flags
* @param aString the attribute corresponding to the flags (null if aFlags
* is zero)
*/
static void SandboxFlagsToString(uint32_t aFlags, nsAString& aString);
/**
* Helper function that generates a UUID.
*/
static nsresult GenerateUUIDInPlace(nsID& aUUID);
static bool PrefetchPreloadEnabled(nsIDocShell* aDocShell);
static void
ExtractErrorValues(JSContext* aCx, JS::Handle<JS::Value> aValue,
nsAString& aSourceSpecOut, uint32_t *aLineOut,
uint32_t *aColumnOut, nsString& aMessageOut);
// Variant on `ExtractErrorValues` with a `nsACString`. This
// method is provided for backwards compatibility. Prefer the
// faster method above for your code.
static void
ExtractErrorValues(JSContext* aCx, JS::Handle<JS::Value> aValue,
nsACString& aSourceSpecOut, uint32_t *aLineOut,
uint32_t *aColumnOut, nsString& aMessageOut);
/**
* Helper function to tell if user ever enabled DevTools explicitely.
* Allows making DevTools related API no-op until user do so.
*/
static bool DevToolsEnabled(JSContext* aCx);
/**
* Fill (with the parameters given) the localized string named |aKey| in
* properties file |aFile|.
*/
private:
static nsresult FormatLocalizedString(PropertiesFile aFile,
const char* aKey,
const char16_t** aParams,
uint32_t aParamsLength,
nsAString& aResult);
public:
template<uint32_t N>
static nsresult FormatLocalizedString(PropertiesFile aFile,
const char* aKey,
const char16_t* (&aParams)[N],
nsAString& aResult)
{
return FormatLocalizedString(aFile, aKey, aParams, N, aResult);
}
/**
* Fill (with the parameters given) the localized string named |aKey| in
* properties file |aFile| consuming an nsTArray of nsString parameters rather
* than a char16_t** for the sake of avoiding use-after-free errors involving
* temporaries.
*/
static nsresult FormatLocalizedString(PropertiesFile aFile,
const char* aKey,
const nsTArray<nsString>& aParamArray,
nsAString& aResult);
/**
* Returns true if aDocument is a chrome document
*/
static bool IsChromeDoc(nsIDocument *aDocument);
/**
* Returns true if aDocument is in a docshell whose parent is the same type
*/
static bool IsChildOfSameType(nsIDocument* aDoc);
/**
* Returns true if the content-type will be rendered as plain-text.
*/
static bool IsPlainTextType(const nsACString& aContentType);
/**
* Returns true iff the type is rendered as plain text and doesn't support
* non-UTF-8 encodings.
*/
static bool IsUtf8OnlyPlainTextType(const nsACString& aContentType);
/**
* Get the script file name to use when compiling the script
* referenced by aURI. In cases where there's no need for any extra
* security wrapper automation the script file name that's returned
* will be the spec in aURI, else it will be the spec in aDocument's
* URI followed by aURI's spec, separated by " -> ". Returns true
* if the script file name was modified, false if it's aURI's
* spec.
*/
static bool GetWrapperSafeScriptFilename(nsIDocument *aDocument,
nsIURI *aURI,
nsACString& aScriptURI,
nsresult* aRv);
/**
* Returns true if aDocument belongs to a chrome docshell for
* display purposes. Returns false for null documents or documents
* which do not belong to a docshell.
*/
static bool IsInChromeDocshell(nsIDocument *aDocument);
/**
* Return the content policy service
*/
static nsIContentPolicy *GetContentPolicy();
/**
* Map internal content policy types to external ones.
*/
static inline nsContentPolicyType
InternalContentPolicyTypeToExternal(nsContentPolicyType aType);
/**
* Map internal content policy types to external ones or preload types:
* * TYPE_INTERNAL_SCRIPT_PRELOAD
* * TYPE_INTERNAL_IMAGE_PRELOAD
* * TYPE_INTERNAL_STYLESHEET_PRELOAD
*
* Note: DO NOT call this function unless you know what you're doing!
*/
static inline nsContentPolicyType
InternalContentPolicyTypeToExternalOrPreload(nsContentPolicyType aType);
/**
* Map internal content policy types to external ones, worker, or preload types:
* * TYPE_INTERNAL_WORKER
* * TYPE_INTERNAL_SHARED_WORKER
* * TYPE_INTERNAL_SERVICE_WORKER
*
* Note: DO NOT call this function unless you know what you're doing!
*/
static nsContentPolicyType InternalContentPolicyTypeToExternalOrWorker(nsContentPolicyType aType);
/**
* Returns true if the content policy type is any of:
* * TYPE_INTERNAL_SCRIPT_PRELOAD
* * TYPE_INTERNAL_IMAGE_PRELOAD
* * TYPE_INTERNAL_STYLESHEET_PRELOAD
*/
static bool IsPreloadType(nsContentPolicyType aType);
/**
* Returns true if the pref "security.mixed_content.upgrade_display_content" is true
* and the content policy type is any of:
* * TYPE_IMAGE
* * TYPE_MEDIA
*/
static bool IsUpgradableDisplayType(nsContentPolicyType aType);
/**
* Quick helper to determine whether there are any mutation listeners
* of a given type that apply to this content or any of its ancestors.
* The method has the side effect to call document's MayDispatchMutationEvent
* using aTargetForSubtreeModified as the parameter.
*
* @param aNode The node to search for listeners
* @param aType The type of listener (NS_EVENT_BITS_MUTATION_*)
* @param aTargetForSubtreeModified The node which is the target of the
* possible DOMSubtreeModified event.
*
* @return true if there are mutation listeners of the specified type
*/
static bool HasMutationListeners(nsINode* aNode,
uint32_t aType,
nsINode* aTargetForSubtreeModified);
/**
* Quick helper to determine whether there are any mutation listeners
* of a given type that apply to any content in this document. It is valid
* to pass null for aDocument here, in which case this function always
* returns true.
*
* @param aDocument The document to search for listeners
* @param aType The type of listener (NS_EVENT_BITS_MUTATION_*)
*
* @return true if there are mutation listeners of the specified type
*/
static bool HasMutationListeners(nsIDocument* aDocument,
uint32_t aType);
/**
* Synchronously fire DOMNodeRemoved on aChild. Only fires the event if
* there really are listeners by checking using the HasMutationListeners
* function above. The function makes sure to hold the relevant objects alive
* for the duration of the event firing. However there are no guarantees
* that any of the objects are alive by the time the function returns.
* If you depend on that you need to hold references yourself.
*
* @param aChild The node to fire DOMNodeRemoved at.
* @param aParent The parent of aChild.
*/
static void MaybeFireNodeRemoved(nsINode* aChild, nsINode* aParent);
/**
* This method creates and dispatches a trusted event.
* Works only with events which can be created by calling
* nsIDocument::CreateEvent() with parameter "Events".
* @param aDoc The document which will be used to create the event.
* @param aTarget The target of the event, should be QIable to
* EventTarget.
* @param aEventName The name of the event.
* @param aCanBubble Whether the event can bubble.
* @param aCancelable Is the event cancelable.
* @param aDefaultAction Set to true if default action should be taken,
* see EventTarget::DispatchEvent.
*/
static nsresult DispatchTrustedEvent(nsIDocument* aDoc,
nsISupports* aTarget,
const nsAString& aEventName,
CanBubble,
Cancelable,
bool* aDefaultAction = nullptr);
/**
* This method creates and dispatches a trusted event using an event message.
* @param aDoc The document which will be used to create the event.
* @param aTarget The target of the event, should be QIable to
* EventTarget.
* @param aEventMessage The event message.
* @param aCanBubble Whether the event can bubble.
* @param aCancelable Is the event cancelable.
* @param aDefaultAction Set to true if default action should be taken,
* see EventTarget::DispatchEvent.
*/
template <class WidgetEventType>
static nsresult DispatchTrustedEvent(
nsIDocument* aDoc,
nsISupports* aTarget,
EventMessage aEventMessage,
CanBubble aCanBubble,
Cancelable aCancelable,
bool* aDefaultAction = nullptr,
ChromeOnlyDispatch aOnlyChromeDispatch = ChromeOnlyDispatch::eNo)
{
WidgetEventType event(true, aEventMessage);
MOZ_ASSERT(GetEventClassIDFromMessage(aEventMessage) == event.mClass);
return DispatchEvent(aDoc, aTarget, event, aEventMessage,
aCanBubble, aCancelable, Trusted::eYes,
aDefaultAction, aOnlyChromeDispatch);
}
/**
* This method creates and dispatches a untrusted event.
* Works only with events which can be created by calling
* nsIDocument::CreateEvent() with parameter "Events".
* @param aDoc The document which will be used to create the event.
* @param aTarget The target of the event, should be QIable to
* EventTarget.
* @param aEventName The name of the event.
* @param aCanBubble Whether the event can bubble.
* @param aCancelable Is the event cancelable.
* @param aDefaultAction Set to true if default action should be taken,
* see EventTarget::DispatchEvent.
*/
static nsresult DispatchUntrustedEvent(nsIDocument* aDoc,
nsISupports* aTarget,
const nsAString& aEventName,
CanBubble,
Cancelable,
bool* aDefaultAction = nullptr);
/**
* This method creates and dispatches a untrusted event using an event message.
* @param aDoc The document which will be used to create the event.
* @param aTarget The target of the event, should be QIable to
* EventTarget.
* @param aEventMessage The event message.
* @param aCanBubble Whether the event can bubble.
* @param aCancelable Is the event cancelable.
* @param aDefaultAction Set to true if default action should be taken,
* see EventTarget::DispatchEvent.
*/
template <class WidgetEventType>
static nsresult DispatchUntrustedEvent(
nsIDocument* aDoc,
nsISupports* aTarget,
EventMessage aEventMessage,
CanBubble aCanBubble,
Cancelable aCancelable,
bool* aDefaultAction = nullptr,
ChromeOnlyDispatch aOnlyChromeDispatch = ChromeOnlyDispatch::eNo)
{
WidgetEventType event(false, aEventMessage);
MOZ_ASSERT(GetEventClassIDFromMessage(aEventMessage) == event.mClass);
return DispatchEvent(aDoc, aTarget, event, aEventMessage,
aCanBubble, aCancelable, Trusted::eNo,
aDefaultAction, aOnlyChromeDispatch);
}
/**
* This method creates and dispatches a trusted event to the chrome
* event handler (the parent object of the DOM Window in the event target
* chain). Note, chrome event handler is used even if aTarget is a chrome
* object. Use DispatchEventOnlyToChrome if the normal event dispatching is
* wanted in case aTarget is a chrome object.
* Works only with events which can be created by calling
* nsIDocument::CreateEvent() with parameter "Events".
* @param aDocument The document which will be used to create the event,
* and whose window's chrome handler will be used to
* dispatch the event.
* @param aTarget The target of the event, used for event->SetTarget()
* @param aEventName The name of the event.
* @param aCanBubble Whether the event can bubble.
* @param aCancelable Is the event cancelable.
* @param aDefaultAction Set to true if default action should be taken,
* see EventTarget::DispatchEvent.
*/
static nsresult DispatchChromeEvent(nsIDocument* aDoc,
nsISupports* aTarget,
const nsAString& aEventName,
CanBubble,
Cancelable,
bool* aDefaultAction = nullptr);
/**
* Helper function for dispatching a "DOMWindowFocus" event to
* the chrome event handler of the given DOM Window. This has the effect
* of focusing the corresponding tab and bringing the browser window
* to the foreground.
*/
static nsresult DispatchFocusChromeEvent(nsPIDOMWindowOuter* aWindow);
/**
* This method creates and dispatches a trusted event.
* If aTarget is not a chrome object, the nearest chrome object in the
* propagation path will be used as the start of the event target chain.
* This method is different than DispatchChromeEvent, which always dispatches
* events to chrome event handler. DispatchEventOnlyToChrome works like
* DispatchTrustedEvent in the case aTarget is a chrome object.
* Works only with events which can be created by calling
* nsIDocument::CreateEvent() with parameter "Events".
* @param aDoc The document which will be used to create the event.
* @param aTarget The target of the event, should be QIable to
* EventTarget.
* @param aEventName The name of the event.
* @param aCanBubble Whether the event can bubble.
* @param aCancelable Is the event cancelable.
* @param aDefaultAction Set to true if default action should be taken,
* see EventTarget::DispatchEvent.
*/
static nsresult DispatchEventOnlyToChrome(nsIDocument* aDoc,
nsISupports* aTarget,
const nsAString& aEventName,
CanBubble,
Cancelable,
bool* aDefaultAction = nullptr);
/**
* Determines if an event attribute name (such as onclick) is valid for
* a given element type. Types are from the EventNameType enumeration
* defined above.
*
* @param aName the event name to look up
* @param aType the type of content
*/
static bool IsEventAttributeName(nsAtom* aName, int32_t aType);
/**
* Return the event message for the event with the given name. The name is
* the event name with the 'on' prefix. Returns eUnidentifiedEvent if the
* event doesn't match a known event name.
*
* @param aName the event name to look up
*/
static EventMessage GetEventMessage(nsAtom* aName);
/**
* Returns the EventMessage and nsAtom to be used for event listener
* registration.
*/
static EventMessage
GetEventMessageAndAtomForListener(const nsAString& aName, nsAtom** aOnName);
/**
* Return the EventClassID for the event with the given name. The name is the
* event name *without* the 'on' prefix. Returns eBasicEventClass if the event
* is not known to be of any particular event class.
*
* @param aName the event name to look up
*/
static mozilla::EventClassID GetEventClassID(const nsAString& aName);
/**
* Return the event message and atom for the event with the given name.
* The name is the event name *without* the 'on' prefix.
* Returns eUnidentifiedEvent on the aEventID if the
* event doesn't match a known event name in the category.
*
* @param aName the event name to look up
* @param aEventClassID only return event id for aEventClassID
*/
static nsAtom* GetEventMessageAndAtom(const nsAString& aName,
mozilla::EventClassID aEventClassID,
EventMessage* aEventMessage);
/**
* Used only during traversal of the XPCOM graph by the cycle
* collector: push a pointer to the listener manager onto the
* children deque, if it exists. Do nothing if there is no listener
* manager.
*
* Crucially: does not perform any refcounting operations.
*
* @param aNode The node to traverse.
* @param children The buffer to push a listener manager pointer into.
*/
static void TraverseListenerManager(nsINode *aNode,
nsCycleCollectionTraversalCallback &cb);
/**
* Get the eventlistener manager for aNode, creating it if it does not
* already exist.
*
* @param aNode The node for which to get the eventlistener manager.
*/
static mozilla::EventListenerManager*
GetListenerManagerForNode(nsINode* aNode);
/**
* Get the eventlistener manager for aNode, returning null if it does not
* already exist.
*
* @param aNode The node for which to get the eventlistener manager.
*/
static mozilla::EventListenerManager*
GetExistingListenerManagerForNode(const nsINode* aNode);
static void UnmarkGrayJSListenersInCCGenerationDocuments();
/**
* Remove the eventlistener manager for aNode.
*
* @param aNode The node for which to remove the eventlistener manager.
*/
static void RemoveListenerManager(nsINode *aNode);
static bool IsInitialized()
{
return sInitialized;
}
/**
* Checks if the localname/prefix/namespace triple is valid wrt prefix
* and namespace according to the Namespaces in XML and DOM Code
* specfications.
*
* @param aLocalname localname of the node
* @param aPrefix prefix of the node
* @param aNamespaceID namespace of the node
*/
static bool IsValidNodeName(nsAtom *aLocalName, nsAtom *aPrefix,
int32_t aNamespaceID);
/**
* Creates a DocumentFragment from text using a context node to resolve
* namespaces.
*
* Please note that for safety reasons, if the node principal of
* aContextNode is the system principal, this function will automatically
* sanitize its input using nsTreeSanitizer.
*
* Note! In the HTML case with the HTML5 parser enabled, this is only called
* from Range.createContextualFragment() and the implementation here is
* quirky accordingly (html context node behaves like a body context node).
* If you don't want that quirky behavior, don't use this method as-is!
*
* @param aContextNode the node which is used to resolve namespaces
* @param aFragment the string which is parsed to a DocumentFragment
* @param aReturn the resulting fragment
* @param aPreventScriptExecution whether to mark scripts as already started
*/
static already_AddRefed<mozilla::dom::DocumentFragment>
CreateContextualFragment(nsINode* aContextNode, const nsAString& aFragment,
bool aPreventScriptExecution,
mozilla::ErrorResult& aRv);
/**
* Invoke the fragment parsing algorithm (innerHTML) using the HTML parser.
*
* Please note that for safety reasons, if the node principal of aTargetNode
* is the system principal, this function will automatically sanitize its
* input using nsTreeSanitizer.
*
* @param aSourceBuffer the string being set as innerHTML
* @param aTargetNode the target container
* @param aContextLocalName local name of context node
* @param aContextNamespace namespace of context node
* @param aQuirks true to make <table> not close <p>
* @param aPreventScriptExecution true to prevent scripts from executing;
* don't set to false when parsing into a target node that has been
* bound to tree.
* @return NS_ERROR_DOM_INVALID_STATE_ERR if a re-entrant attempt to parse
* fragments is made, NS_ERROR_OUT_OF_MEMORY if aSourceBuffer is too
* long and NS_OK otherwise.
*/
static nsresult ParseFragmentHTML(const nsAString& aSourceBuffer,
nsIContent* aTargetNode,
nsAtom* aContextLocalName,
int32_t aContextNamespace,
bool aQuirks,
bool aPreventScriptExecution);
/**
* Invoke the fragment parsing algorithm (innerHTML) using the XML parser.
*
* Please note that for safety reasons, if the node principal of aDocument
* is the system principal, this function will automatically sanitize its
* input using nsTreeSanitizer.
*
* @param aSourceBuffer the string being set as innerHTML
* @param aDocument the target document
* @param aTagStack the namespace mapping context
* @param aPreventExecution whether to mark scripts as already started
* @param aReturn the result fragment
* @return NS_ERROR_DOM_INVALID_STATE_ERR if a re-entrant attempt to parse
* fragments is made, a return code from the XML parser.
*/
static nsresult ParseFragmentXML(const nsAString& aSourceBuffer,
nsIDocument* aDocument,
nsTArray<nsString>& aTagStack,
bool aPreventScriptExecution,
mozilla::dom::DocumentFragment** aReturn);
/**
* Parse a string into a document using the HTML parser.
* Script elements are marked unexecutable.
*
* @param aSourceBuffer the string to parse as an HTML document
* @param aTargetDocument the document object to parse into. Must not have
* child nodes.
* @param aScriptingEnabledForNoscriptParsing whether <noscript> is parsed
* as if scripting was enabled
* @return NS_ERROR_DOM_INVALID_STATE_ERR if a re-entrant attempt to parse
* fragments is made, NS_ERROR_OUT_OF_MEMORY if aSourceBuffer is too
* long and NS_OK otherwise.
*/
static nsresult ParseDocumentHTML(const nsAString& aSourceBuffer,
nsIDocument* aTargetDocument,
bool aScriptingEnabledForNoscriptParsing);
/**
* Converts HTML source to plain text by parsing the source and using the
* plain text serializer on the resulting tree.
*
* @param aSourceBuffer the string to parse as an HTML document
* @param aResultBuffer the string where the plain text result appears;
* may be the same string as aSourceBuffer
* @param aFlags Flags from nsIDocumentEncoder.
* @param aWrapCol Number of columns after which to line wrap; 0 for no
* auto-wrapping
* @return NS_ERROR_DOM_INVALID_STATE_ERR if a re-entrant attempt to parse
* fragments is made, NS_ERROR_OUT_OF_MEMORY if aSourceBuffer is too
* long and NS_OK otherwise.
*/
static nsresult ConvertToPlainText(const nsAString& aSourceBuffer,
nsAString& aResultBuffer,
uint32_t aFlags,
uint32_t aWrapCol);
/**
* Sets the text contents of a node by replacing all existing children
* with a single text child.
*
* The function always notifies.
*
* Will reuse the first text child if one is available. Will not reuse
* existing cdata children.
*
* @param aContent Node to set contents of.
* @param aValue Value to set contents to.
* @param aTryReuse When true, the function will try to reuse an existing
* textnodes rather than always creating a new one.
*/
static nsresult SetNodeTextContent(nsIContent* aContent,
const nsAString& aValue,
bool aTryReuse);
/**
* Get the textual contents of a node. This is a concatenation of all
* textnodes that are direct or (depending on aDeep) indirect children
* of the node.
*
* NOTE! No serialization takes place and <br> elements
* are not converted into newlines. Only textnodes and cdata nodes are
* added to the result.
*
* @see nsLayoutUtils::GetFrameTextContent
*
* @param aNode Node to get textual contents of.
* @param aDeep If true child elements of aNode are recursivly descended
* into to find text children.
* @param aResult the result. Out param.
* @return false on out of memory errors, true otherwise.
*/
MOZ_MUST_USE
static bool GetNodeTextContent(nsINode* aNode, bool aDeep,
nsAString& aResult, const mozilla::fallible_t&);
static void GetNodeTextContent(nsINode* aNode, bool aDeep,
nsAString& aResult);
/**
* Same as GetNodeTextContents but appends the result rather than sets it.
*/
static bool AppendNodeTextContent(nsINode* aNode, bool aDeep,
nsAString& aResult, const mozilla::fallible_t&);
/**
* Utility method that checks if a given node has any non-empty children. This
* method does not descend recursively into children by default.
*
* @param aDiscoverMode Set to eRecurseIntoChildren to descend recursively
* into children.
*/
enum TextContentDiscoverMode : uint8_t {
eRecurseIntoChildren, eDontRecurseIntoChildren
};
static bool HasNonEmptyTextContent(
nsINode* aNode,
TextContentDiscoverMode aDiscoverMode = eDontRecurseIntoChildren);
/**
* Delete strings allocated for nsContentList matches
*/
static void DestroyMatchString(void* aData);
/*
* Notify when the first XUL menu is opened and when the all XUL menus are
* closed. At opening, aInstalling should be TRUE, otherwise, it should be
* FALSE.
*/
static void NotifyInstalledMenuKeyboardListener(bool aInstalling);
/**
* Check whether the nsIURI uses the given scheme.
*
* Note that this will check the innermost URI rather than that of
* the nsIURI itself.
*/
static bool SchemeIs(nsIURI* aURI, const char* aScheme);
/**
* Returns true if aPrincipal is the system principal.
*/
static bool IsSystemPrincipal(nsIPrincipal* aPrincipal);
/**
* Returns true if aPrincipal is an ExpandedPrincipal.
*/
static bool IsExpandedPrincipal(nsIPrincipal* aPrincipal);
/**
* Returns true if aPrincipal is the system or an ExpandedPrincipal.
*/
static bool IsSystemOrExpandedPrincipal(nsIPrincipal* aPrincipal)
{
return IsSystemPrincipal(aPrincipal) || IsExpandedPrincipal(aPrincipal);
}
/**
* Gets the system principal from the security manager.
*/
static nsIPrincipal* GetSystemPrincipal();
/**
* Gets the null subject principal singleton. This is only useful for
* assertions.
*/
static nsIPrincipal* GetNullSubjectPrincipal() { return sNullSubjectPrincipal; }
/**
* *aResourcePrincipal is a principal describing who may access the contents
* of a resource. The resource can only be consumed by a principal that
* subsumes *aResourcePrincipal. MAKE SURE THAT NOTHING EVER ACTS WITH THE
* AUTHORITY OF *aResourcePrincipal.
* It may be null to indicate that the resource has no data from any origin
* in it yet and anything may access the resource.
* Additional data is being mixed into the resource from aExtraPrincipal
* (which may be null; if null, no data is being mixed in and this function
* will do nothing). Update *aResourcePrincipal to reflect the new data.
* If *aResourcePrincipal subsumes aExtraPrincipal, nothing needs to change,
* otherwise *aResourcePrincipal is replaced with the system principal.
* Returns true if *aResourcePrincipal changed.
*/
static bool CombineResourcePrincipals(nsCOMPtr<nsIPrincipal>* aResourcePrincipal,
nsIPrincipal* aExtraPrincipal);
/**
* Trigger a link with uri aLinkURI. If aClick is false, this triggers a
* mouseover on the link, otherwise it triggers a load after doing a
* security check using aContent's principal.
*
* @param aContent the node on which a link was triggered.
* @param aPresContext the pres context, must be non-null.
* @param aLinkURI the URI of the link, must be non-null.
* @param aTargetSpec the target (like target=, may be empty).
* @param aClick whether this was a click or not (if false, this method
* assumes you just hovered over the link).
* @param aIsTrusted If false, JS Context will be pushed to stack
* when the link is triggered.
*/
static void TriggerLink(nsIContent *aContent, nsPresContext *aPresContext,
nsIURI *aLinkURI, const nsString& aTargetSpec,
bool aClick, bool aIsTrusted);
/**
* Get the link location.
*/
static void GetLinkLocation(mozilla::dom::Element* aElement,
nsString& aLocationString);
/**
* Return top-level widget in the parent chain.
*/
static nsIWidget* GetTopLevelWidget(nsIWidget* aWidget);
/**
* Return the localized ellipsis for UI.
*/
static const nsDependentString GetLocalizedEllipsis();
/**
* Hide any XUL popups associated with aDocument, including any documents
* displayed in child frames. Does nothing if aDocument is null.
*/
static void HidePopupsInDocument(nsIDocument* aDocument);
/**
* Retrieve the current drag session, or null if no drag is currently occuring
*/
static already_AddRefed<nsIDragSession> GetDragSession();
/*
* Initialize and set the dataTransfer field of an WidgetDragEvent.
*/
static nsresult SetDataTransferInEvent(mozilla::WidgetDragEvent* aDragEvent);
// filters the drag and drop action to fit within the effects allowed and
// returns it.
static uint32_t FilterDropEffect(uint32_t aAction, uint32_t aEffectAllowed);
/*
* Return true if the target of a drop event is a content document that is
* an ancestor of the document for the source of the drag.
*/
static bool CheckForSubFrameDrop(nsIDragSession* aDragSession,
mozilla::WidgetDragEvent* aDropEvent);
/**
* Return true if aURI is a local file URI (i.e. file://).
*/
static bool URIIsLocalFile(nsIURI *aURI);
/**
* Get the application manifest URI for this document. The manifest URI
* is specified in the manifest= attribute of the root element of the
* document.
*
* @param aDocument The document that lists the manifest.
* @param aURI The manifest URI.
*/
static void GetOfflineAppManifest(nsIDocument *aDocument, nsIURI **aURI);
/**
* Check whether an application should be allowed to use offline APIs.
*/
static bool OfflineAppAllowed(nsIURI *aURI);
/**
* Check whether an application should be allowed to use offline APIs.
*/
static bool OfflineAppAllowed(nsIPrincipal *aPrincipal);
/**
* If offline-apps.allow_by_default is true, we set offline-app permission
* for the principal and return true. Otherwise false.
*/
static bool MaybeAllowOfflineAppByDefault(nsIPrincipal *aPrincipal);
/**
* Increases the count of blockers preventing scripts from running.
* NOTE: You might want to use nsAutoScriptBlocker rather than calling
* this directly
*/
static void AddScriptBlocker();
/**
* Decreases the count of blockers preventing scripts from running.
* NOTE: You might want to use nsAutoScriptBlocker rather than calling
* this directly
*
* WARNING! Calling this function could synchronously execute scripts.
*/
static void RemoveScriptBlocker();
/**
* Add a runnable that is to be executed as soon as it's safe to execute
* scripts.
* NOTE: If it's currently safe to execute scripts, aRunnable will be run
* synchronously before the function returns.
*
* @param aRunnable The nsIRunnable to run as soon as it's safe to execute
* scripts. Passing null is allowed and results in nothing
* happening. It is also allowed to pass an object that
* has not yet been AddRefed.
*/
static void AddScriptRunner(already_AddRefed<nsIRunnable> aRunnable);
static void AddScriptRunner(nsIRunnable* aRunnable);
/**
* Returns true if it's safe to execute content script and false otherwise.
*
* The only known case where this lies is mutation events. They run, and can
* run anything else, when this function returns false, but this is ok.
*/
static bool IsSafeToRunScript() {
MOZ_ASSERT(NS_IsMainThread(),
"This static variable only makes sense on the main thread!");
return sScriptBlockerCount == 0;
}
// XXXcatalinb: workaround for weird include error when trying to reference
// ipdl types in WindowWatcher.
static nsIWindowProvider*
GetWindowProviderForContentProcess();
// Returns the browser window with the most recent time stamp that is
// not in private browsing mode.
static already_AddRefed<nsPIDOMWindowOuter>
GetMostRecentNonPBWindow();
/**
* Call this function if !IsSafeToRunScript() and we fail to run the script
* (rather than using AddScriptRunner as we usually do). |aDocument| is
* optional as it is only used for showing the URL in the console.
*/
static void WarnScriptWasIgnored(nsIDocument* aDocument);
/**
* Add a "synchronous section", in the form of an nsIRunnable run once the
* event loop has reached a "stable state". |aRunnable| must not cause any
* queued events to be processed (i.e. must not spin the event loop).
* We've reached a stable state when the currently executing task/event has
* finished, see
* http://www.whatwg.org/specs/web-apps/current-work/multipage/webappapis.html#synchronous-section
* In practice this runs aRunnable once the currently executing event
* finishes. If called multiple times per task/event, all the runnables will
* be executed, in the order in which RunInStableState() was called.
*/
static void RunInStableState(already_AddRefed<nsIRunnable> aRunnable);
/* Add a pending IDBTransaction to be cleaned up at the end of performing a
* microtask checkpoint.
* See the step of "Cleanup Indexed Database Transactions" in
* https://html.spec.whatwg.org/multipage/webappapis.html#perform-a-microtask-checkpoint
*/
static void AddPendingIDBTransaction(already_AddRefed<nsIRunnable> aTransaction);
/**
* Returns true if we are doing StableState/MetastableState.
*/
static bool IsInStableOrMetaStableState();
/* Process viewport META data. This gives us information for the scale
* and zoom of a page on mobile devices. We stick the information in
* the document header and use it later on after rendering.
*
* See Bug #436083
*/
static nsresult ProcessViewportInfo(nsIDocument *aDocument,
const nsAString &viewportInfo);
static JSContext *GetCurrentJSContext();
/**
* Case insensitive comparison between two strings. However it only ignores
* case for ASCII characters a-z.
*/
static bool EqualsIgnoreASCIICase(const nsAString& aStr1,
const nsAString& aStr2);
/**
* Convert ASCII A-Z to a-z.
*/
static void ASCIIToLower(nsAString& aStr);
static void ASCIIToLower(nsACString& aStr);
static void ASCIIToLower(const nsAString& aSource, nsAString& aDest);
static void ASCIIToLower(const nsACString& aSource, nsACString& aDest);
/**
* Convert ASCII a-z to A-Z.
*/
static void ASCIIToUpper(nsAString& aStr);
static void ASCIIToUpper(nsACString& aStr);
static void ASCIIToUpper(const nsAString& aSource, nsAString& aDest);
static void ASCIIToUpper(const nsACString& aSource, nsACString& aDest);
/**
* Return whether aStr contains an ASCII uppercase character.
*/
static bool StringContainsASCIIUpper(const nsAString& aStr);
// Returns NS_OK for same origin, error (NS_ERROR_DOM_BAD_URI) if not.
static nsresult CheckSameOrigin(nsIChannel *aOldChannel, nsIChannel *aNewChannel);
static nsIInterfaceRequestor* SameOriginChecker();
/**
* Get the Origin of the passed in nsIPrincipal or nsIURI. If the passed in
* nsIURI or the URI of the passed in nsIPrincipal does not have a host, the
* origin is set to 'null'.
*
* The ASCII versions return a ASCII strings that are puny-code encoded,
* suitable for, for example, header values. The UTF versions return strings
* containing international characters.
*
* @pre aPrincipal/aOrigin must not be null.
*
* @note this should be used for HTML5 origin determination.
*/
static nsresult GetASCIIOrigin(nsIPrincipal* aPrincipal,
nsACString& aOrigin);
static nsresult GetASCIIOrigin(nsIURI* aURI, nsACString& aOrigin);
static nsresult GetUTFOrigin(nsIPrincipal* aPrincipal,
nsAString& aOrigin);
static nsresult GetUTFOrigin(nsIURI* aURI, nsAString& aOrigin);
/**
* This method creates and dispatches "command" event, which implements
* XULCommandEvent.
* If aShell is not null, dispatching goes via
* nsIPresShell::HandleDOMEventWithTarget.
*/
static nsresult DispatchXULCommand(nsIContent* aTarget,
bool aTrusted,
mozilla::dom::Event* aSourceEvent = nullptr,
nsIPresShell* aShell = nullptr,
bool aCtrl = false,
bool aAlt = false,
bool aShift = false,
bool aMeta = false,
// Including MouseEventBinding here leads
// to incude loops, unfortunately.
uint16_t inputSource = 0 /* MouseEvent_Binding::MOZ_SOURCE_UNKNOWN */);
static bool CheckMayLoad(nsIPrincipal* aPrincipal, nsIChannel* aChannel, bool aAllowIfInheritsPrincipal);
/**
* The method checks whether the caller can access native anonymous content.
* If there is no JS in the stack or privileged JS is running, this
* method returns true, otherwise false.
*/
static bool CanAccessNativeAnon();
MOZ_MUST_USE
static nsresult WrapNative(JSContext *cx, nsISupports *native,
const nsIID* aIID, JS::MutableHandle<JS::Value> vp,
bool aAllowWrapping = true)
{
return WrapNative(cx, native, nullptr, aIID, vp, aAllowWrapping);
}
// Same as the WrapNative above, but use this one if aIID is nsISupports' IID.
MOZ_MUST_USE
static nsresult WrapNative(JSContext *cx, nsISupports *native,
JS::MutableHandle<JS::Value> vp,
bool aAllowWrapping = true)
{
return WrapNative(cx, native, nullptr, nullptr, vp, aAllowWrapping);
}
MOZ_MUST_USE
static nsresult WrapNative(JSContext *cx, nsISupports *native,
nsWrapperCache *cache,
JS::MutableHandle<JS::Value> vp,
bool aAllowWrapping = true)
{
return WrapNative(cx, native, cache, nullptr, vp, aAllowWrapping);
}
/**
* Creates an arraybuffer from a binary string.
*/
static nsresult CreateArrayBuffer(JSContext *aCx, const nsACString& aData,
JSObject** aResult);
static void StripNullChars(const nsAString& aInStr, nsAString& aOutStr);
/**
* Strip all \n, \r and nulls from the given string
* @param aString the string to remove newlines from [in/out]
*/
static void RemoveNewlines(nsString &aString);
/**
* Convert Windows and Mac platform linebreaks to \n.
* @param aString the string to convert the newlines inside [in/out]
*/
static void PlatformToDOMLineBreaks(nsString &aString);
MOZ_MUST_USE
static bool PlatformToDOMLineBreaks(nsString &aString,
const mozilla::fallible_t&);
/**
* Populates aResultString with the contents of the string-buffer aBuf, up
* to aBuf's null-terminator. aBuf must not be null. Ownership of the string
* is not transferred.
*/
static void PopulateStringFromStringBuffer(nsStringBuffer* aBuf,
nsAString& aResultString);
static bool IsHandlingKeyBoardEvent()
{
return sIsHandlingKeyBoardEvent;
}
static void SetIsHandlingKeyBoardEvent(bool aHandling)
{
sIsHandlingKeyBoardEvent = aHandling;
}
/**
* Utility method for getElementsByClassName. aRootNode is the node (either
* document or element), which getElementsByClassName was called on.
*/
static already_AddRefed<nsContentList>
GetElementsByClassName(nsINode* aRootNode, const nsAString& aClasses)
{
MOZ_ASSERT(aRootNode, "Must have root node");
return GetFuncStringContentList<nsCacheableFuncStringHTMLCollection>(aRootNode,
MatchClassNames,
DestroyClassNameArray,
AllocClassMatchingInfo,
aClasses);
}
/**
* Returns a presshell for this document, if there is one. This will be
* aDoc's direct presshell if there is one, otherwise we'll look at all
* ancestor documents to try to find a presshell, so for example this can
* still find a presshell for documents in display:none frames that have
* no presentation. So you have to be careful how you use this presshell ---
* getting generic data like a device context or widget from it is OK, but it
* might not be this document's actual presentation.
*/
static nsIPresShell* FindPresShellForDocument(const nsIDocument* aDoc);
/**
* Returns the widget for this document if there is one. Looks at all ancestor
* documents to try to find a widget, so for example this can still find a
* widget for documents in display:none frames that have no presentation.
*
* You should probably use WidgetForContent() instead of this, unless you have
* a good reason to do otherwise.
*/
static nsIWidget* WidgetForDocument(const nsIDocument* aDoc);
/**
* Returns the appropriate widget for this element, if there is one. Unlike
* WidgetForDocument(), this returns the correct widget for content in popups.
*
* You should probably use this instead of WidgetForDocument().
*/
static nsIWidget* WidgetForContent(const nsIContent* aContent);
/**
* Returns a layer manager to use for the given document. Basically we
* look up the document hierarchy for the first document which has
* a presentation with an associated widget, and use that widget's
* layer manager.
*
* You should probably use LayerManagerForContent() instead of this, unless
* you have a good reason to do otherwise.
*
* @param aDoc the document for which to return a layer manager.
* @param aAllowRetaining an outparam that states whether the returned
* layer manager should be used for retained layers
*/
static already_AddRefed<mozilla::layers::LayerManager>
LayerManagerForDocument(const nsIDocument *aDoc);
/**
* Returns a layer manager to use for the given content. Unlike
* LayerManagerForDocument(), this returns the correct layer manager for
* content in popups.
*
* You should probably use this instead of LayerManagerForDocument().
*/
static already_AddRefed<mozilla::layers::LayerManager>
LayerManagerForContent(const nsIContent *aContent);
/**
* Returns a layer manager to use for the given document. Basically we
* look up the document hierarchy for the first document which has
* a presentation with an associated widget, and use that widget's
* layer manager. In addition to the normal layer manager lookup this will
* specifically request a persistent layer manager. This means that the layer
* manager is expected to remain the layer manager for the document in the
* forseeable future. This function should be used carefully as it may change
* the document's layer manager.
*
* @param aDoc the document for which to return a layer manager.
* @param aAllowRetaining an outparam that states whether the returned
* layer manager should be used for retained layers
*/
static already_AddRefed<mozilla::layers::LayerManager>
PersistentLayerManagerForDocument(nsIDocument *aDoc);
/**
* Determine whether a content node is focused or not,
*
* @param aContent the content node to check
* @return true if the content node is focused, false otherwise.
*/
static bool IsFocusedContent(const nsIContent *aContent);
/**
* Returns true if the DOM full-screen API is enabled.
*/
static bool IsFullScreenApiEnabled();
/**
* Returns true if the unprefixed fullscreen API is enabled.
*/
static bool IsUnprefixedFullscreenApiEnabled()
{ return sIsUnprefixedFullscreenApiEnabled; }
/**
* Returns true if requests for full-screen are allowed in the current
* context. Requests are only allowed if the user initiated them (like with
* a mouse-click or key press), unless this check has been disabled by
* setting the pref "full-screen-api.allow-trusted-requests-only" to false.
*/
static bool IsRequestFullScreenAllowed(mozilla::dom::CallerType aCallerType);
/**
* Returns true if calling execCommand with 'cut' or 'copy' arguments
* is restricted to chrome code.
*/
static bool IsCutCopyRestricted()
{
return !sIsCutCopyAllowed;
}
/**
* Returns true if calling execCommand with 'cut' or 'copy' arguments is
* allowed for the given subject principal. These are only allowed if the user
* initiated them (like with a mouse-click or key press).
*/
static bool IsCutCopyAllowed(nsIPrincipal* aSubjectPrincipal);
/*
* Returns true if the performance timing APIs are enabled.
*/
static bool IsPerformanceTimingEnabled()
{
return sIsPerformanceTimingEnabled;
}
/*
* Returns true if the performance timing APIs are enabled.
*/
static bool IsResourceTimingEnabled()
{
return sIsResourceTimingEnabled;
}
/*
* Returns true if the performance timing APIs are enabled.
*/
static bool IsPerformanceNavigationTimingEnabled()
{
return sIsPerformanceNavigationTimingEnabled;
}
/*
* Returns true if notification should be sent for peformance timing events.
*/
static bool SendPerformanceTimingNotifications()
{
return sSendPerformanceTimingNotifications;
}
/*
* Returns true if the frame timing APIs are enabled.
*/
static bool IsFrameTimingEnabled();
/*
* Returns true if the browser should attempt to prevent the given caller type
* from collecting distinctive information about the browser that could
* be used to "fingerprint" and track the user across websites.
*/
static bool ResistFingerprinting(mozilla::dom::CallerType aCallerType)
{
return aCallerType != mozilla::dom::CallerType::System &&
ShouldResistFingerprinting();
}
/**
* Returns true if the browser should show busy cursor when loading page.
*/
static bool UseActivityCursor()
{
return sUseActivityCursor;
}
/**
* Returns true if the DOM Animations API should be enabled.
*/
static bool AnimationsAPICoreEnabled()
{
return sAnimationsAPICoreEnabled;
}
/*
* Returns true if the DOM Animations Element.animate() API should be enabled.
*/
static bool AnimationsAPIElementAnimateEnabled()
{
return sAnimationsAPIElementAnimateEnabled;
}
/**
* Returns true if the getBoxQuads API should be enabled.
*/
static bool GetBoxQuadsEnabled()
{
return sGetBoxQuadsEnabled;
}
/**
* Returns true if the requestIdleCallback API should be enabled.
*/
static bool RequestIdleCallbackEnabled()
{
return sRequestIdleCallbackEnabled;
}
/**
* Returns true if CSSOM origin check should be skipped for WebDriver
* based crawl to be able to collect data from cross-origin CSS style
* sheets. This can be enabled by setting environment variable
* MOZ_BYPASS_CSSOM_ORIGIN_CHECK.
*/
static bool BypassCSSOMOriginCheck()
{
#ifdef RELEASE_OR_BETA
return false;
#else
return sBypassCSSOMOriginCheck;
#endif
}
/**
* Fire mutation events for changes caused by parsing directly into a
* context node.
*
* @param aDoc the document of the node
* @param aDest the destination node that got stuff appended to it
* @param aOldChildCount the number of children the node had before parsing
*/
static void FireMutationEventsForDirectParsing(nsIDocument* aDoc,
nsIContent* aDest,
int32_t aOldChildCount);
/**
* Returns true if the content is in a document and contains a plugin
* which we don't control event dispatch for, i.e. do any plugins in this
* doc tree receive key events outside of our control? This always returns
* false on MacOSX.
*/
static bool HasPluginWithUncontrolledEventDispatch(nsIContent* aContent);
/**
* Returns the root document in a document hierarchy. Normally this
* will be the chrome document.
*/
static nsIDocument* GetRootDocument(nsIDocument* aDoc);
/**
* Returns true if aWin and the current pointer lock document
* have common scriptable top window.
*/
static bool IsInPointerLockContext(nsPIDOMWindowOuter* aWin);
/**
* Returns the time limit on handling user input before
* EventStateManager::IsHandlingUserInput() stops returning true.
* This enables us to detect long running user-generated event handlers.
*/
static TimeDuration HandlingUserInputTimeout();
static void GetShiftText(nsAString& text);
static void GetControlText(nsAString& text);
static void GetMetaText(nsAString& text);
static void GetOSText(nsAString& text);
static void GetAltText(nsAString& text);
static void GetModifierSeparatorText(nsAString& text);
/**
* Returns if aContent has a tabbable subdocument.
* A sub document isn't tabbable when it's a zombie document.
*
* @param aElement element to test.
*
* @return Whether the subdocument is tabbable.
*/
static bool IsSubDocumentTabbable(nsIContent* aContent);
/**
* Returns if aNode ignores user focus.
*
* @param aNode node to test
*
* @return Whether the node ignores user focus.
*/
static bool IsUserFocusIgnored(nsINode* aNode);
/**
* Returns if aContent has the 'scrollgrab' property.
* aContent may be null (in this case false is returned).
*/
static bool HasScrollgrab(nsIContent* aContent);
/**
* Flushes the layout tree (recursively)
*
* @param aWindow the window the flush should start at
*
*/
static void FlushLayoutForTree(nsPIDOMWindowOuter* aWindow);
/**
* Returns true if content with the given principal is allowed to use XUL
* and XBL and false otherwise.
*/
static bool AllowXULXBLForPrincipal(nsIPrincipal* aPrincipal);
/**
* Perform cleanup that's appropriate for XPCOM shutdown.
*/
static void XPCOMShutdown();
/**
* Checks if internal PDF viewer is enabled.
*/
static bool IsPDFJSEnabled();
/**
* Checks if internal SWF player is enabled.
*/
static bool IsSWFPlayerEnabled();
enum ContentViewerType
{
TYPE_UNSUPPORTED,
TYPE_CONTENT,
TYPE_PLUGIN,
TYPE_UNKNOWN
};
static already_AddRefed<nsIDocumentLoaderFactory>
FindInternalContentViewer(const nsACString& aType,
ContentViewerType* aLoaderType = nullptr);
/**
* This helper method returns true if the aPattern pattern matches aValue.
* aPattern should not contain leading and trailing slashes (/).
* The pattern has to match the entire value not just a subset.
* aDocument must be a valid pointer (not null).
*
* This is following the HTML5 specification:
* http://dev.w3.org/html5/spec/forms.html#attr-input-pattern
*
* WARNING: This method mutates aPattern and aValue!
*
* @param aValue the string to check.
* @param aPattern the string defining the pattern.
* @param aDocument the owner document of the element.
* @result whether the given string is matches the pattern.
*/
static bool IsPatternMatching(nsAString& aValue, nsAString& aPattern,
nsIDocument* aDocument);
/**
* Calling this adds support for
* ontouch* event handler DOM attributes.
*/
static void InitializeTouchEventTable();
/**
* Test whether the given URI always inherits a security context
* from the document it comes from.
*/
static nsresult URIInheritsSecurityContext(nsIURI *aURI, bool *aResult);
/**
* Called before a channel is created to query whether the new
* channel should inherit the principal.
*
* The argument aLoadingPrincipal must not be null. The argument
* aURI must be the URI of the new channel. If aInheritForAboutBlank
* is true, then about:blank will be told to inherit the principal.
* If aForceInherit is true, the new channel will be told to inherit
* the principal no matter what.
*
* The return value is whether the new channel should inherit
* the principal.
*/
static bool ChannelShouldInheritPrincipal(nsIPrincipal* aLoadingPrincipal,
nsIURI* aURI,
bool aInheritForAboutBlank,
bool aForceInherit);
static nsresult Btoa(const nsAString& aBinaryData,
nsAString& aAsciiBase64String);
static nsresult Atob(const nsAString& aAsciiString,
nsAString& aBinaryData);
/**
* Returns whether the input element passed in parameter has the autocomplete
* functionality enabled. It is taking into account the form owner.
* NOTE: the caller has to make sure autocomplete makes sense for the
* element's type.
*
* @param aInput the input element to check. NOTE: aInput can't be null.
* @return whether the input element has autocomplete enabled.
*/
static bool IsAutocompleteEnabled(mozilla::dom::HTMLInputElement* aInput);
enum AutocompleteAttrState : uint8_t
{
eAutocompleteAttrState_Unknown = 1,
eAutocompleteAttrState_Invalid,
eAutocompleteAttrState_Valid,
};
/**
* Parses the value of the autocomplete attribute into aResult, ensuring it's
* composed of valid tokens, otherwise the value "" is used.
* Note that this method is used for form fields, not on a <form> itself.
*
* @return whether aAttr was valid and can be cached.
*/
static AutocompleteAttrState
SerializeAutocompleteAttribute(const nsAttrValue* aAttr,
nsAString& aResult,
AutocompleteAttrState aCachedState =
eAutocompleteAttrState_Unknown);
/* Variation that is used to retrieve a dictionary of the parts of the
* autocomplete attribute.
*
* @return whether aAttr was valid and can be cached.
*/
static AutocompleteAttrState
SerializeAutocompleteAttribute(const nsAttrValue* aAttr,
mozilla::dom::AutocompleteInfo& aInfo,
AutocompleteAttrState aCachedState =
eAutocompleteAttrState_Unknown,
bool aGrantAllValidValue = false);
/**
* This will parse aSource, to extract the value of the pseudo attribute
* with the name specified in aName. See
* http://www.w3.org/TR/xml-stylesheet/#NT-StyleSheetPI for the specification
* which is used to parse aSource.
*
* @param aSource the string to parse
* @param aName the name of the attribute to get the value for
* @param aValue [out] the value for the attribute with name specified in
* aAttribute. Empty if the attribute isn't present.
* @return true if the attribute exists and was successfully parsed.
* false if the attribute doesn't exist, or has a malformed
* value, such as an unknown or unterminated entity.
*/
static bool GetPseudoAttributeValue(const nsString& aSource, nsAtom *aName,
nsAString& aValue);
/**
* Returns true if the language name is a version of JavaScript and
* false otherwise
*/
static bool IsJavaScriptLanguage(const nsString& aName);
static bool IsJavascriptMIMEType(const nsAString& aMIMEType);
static void SplitMimeType(const nsAString& aValue, nsString& aType,
nsString& aParams);
/**
* Function checks if the user is idle.
*
* @param aRequestedIdleTimeInMS The idle observer's requested idle time.
* @param aUserIsIdle boolean indicating if the user
* is currently idle or not. *
* @return NS_OK NS_OK returned if the requested idle service and
* the current idle time were successfully obtained.
* NS_ERROR_FAILURE returned if the the requested
* idle service or the current idle were not obtained.
*/
static nsresult IsUserIdle(uint32_t aRequestedIdleTimeInMS, bool* aUserIsIdle);
/**
* Takes a selection, and a text control element (<input> or <textarea>), and
* returns the offsets in the text content corresponding to the selection.
* The selection's anchor and focus must both be in the root node passed or a
* descendant.
*
* @param aSelection Selection to check
* @param aRoot Root <input> or <textarea> element
* @param aOutStartOffset Output start offset
* @param aOutEndOffset Output end offset
*/
static void GetSelectionInTextControl(mozilla::dom::Selection* aSelection,
Element* aRoot,
uint32_t& aOutStartOffset,
uint32_t& aOutEndOffset);
/**
* Takes a frame for anonymous content within a text control (<input> or
* <textarea>), and returns an offset in the text content, adjusted for a
* trailing <br> frame.
*
* @param aOffsetFrame Frame for the text content in which the offset
* lies
* @param aOffset Offset as calculated by GetContentOffsetsFromPoint
* @param aOutOffset Output adjusted offset
*
* @see GetSelectionInTextControl for the original basis of this function.
*/
static int32_t GetAdjustedOffsetInTextControl(nsIFrame* aOffsetFrame,
int32_t aOffset);
/**
* Returns pointer to HTML editor instance for the aPresContext when there is.
* The HTML editor is shared by contenteditable elements or used in
* designMode. When there are no contenteditable elements and the document
* is not in designMode, this returns nullptr.
*/
static mozilla::HTMLEditor* GetHTMLEditor(nsPresContext* aPresContext);
/**
* Returns true if the privacy.donottrackheader.enabled pref is set.
*/
static bool DoNotTrackEnabled();
/**
* Returns a LogModule that dump calls from content script are logged to.
* This can be enabled with the 'Dump' module, and is useful for synchronizing
* content JS to other logging modules.
*/
static mozilla::LogModule* DOMDumpLog();
/**
* Returns whether a given header is forbidden for an XHR or fetch
* request.
*/
static bool IsForbiddenRequestHeader(const nsACString& aHeader);
/**
* Returns whether a given header is forbidden for a system XHR
* request.
*/
static bool IsForbiddenSystemRequestHeader(const nsACString& aHeader);
/**
* Returns whether a given Content-Type header value is allowed
* for a non-CORS XHR or fetch request.
*/
static bool IsAllowedNonCorsContentType(const nsACString& aHeaderValue);
/**
* Returns whether a given header is forbidden for an XHR or fetch
* response.
*/
static bool IsForbiddenResponseHeader(const nsACString& aHeader);
/**
* Returns the inner window ID for the window associated with a request.
*/
static uint64_t GetInnerWindowID(nsIRequest* aRequest);
/**
* Returns the inner window ID for the window associated with a load group.
*/
static uint64_t GetInnerWindowID(nsILoadGroup* aLoadGroup);
/**
* If the hostname for aURI is an IPv6 it encloses it in brackets,
* otherwise it just outputs the hostname in aHost.
*/
static nsresult GetHostOrIPv6WithBrackets(nsIURI* aURI, nsAString& aHost);
static nsresult GetHostOrIPv6WithBrackets(nsIURI* aURI, nsCString& aHost);
/*
* Call the given callback on all remote children of the given top-level
* window. Return true from the callback to stop calling further children.
*/
static void CallOnAllRemoteChildren(nsPIDOMWindowOuter* aWindow,
CallOnRemoteChildFunction aCallback,
void* aArg);
/*
* Call nsPIDOMWindow::SetKeyboardIndicators all all remote children. This is
* in here rather than nsGlobalWindow because TabParent indirectly includes
* Windows headers which aren't allowed there.
*/
static void SetKeyboardIndicatorsOnRemoteChildren(nsPIDOMWindowOuter* aWindow,
UIStateChangeType aShowAccelerators,
UIStateChangeType aShowFocusRings);
/**
* Given an nsIFile, attempts to read it into aString.
*
* Note: Use sparingly! This causes main-thread I/O, which causes jank and all
* other bad things.
*/
static nsresult SlurpFileToString(nsIFile* aFile, nsACString& aString);
/**
* Returns true if the mime service thinks this file contains an image.
*
* The content type is returned in aType.
*/
static bool IsFileImage(nsIFile* aFile, nsACString& aType);
/**
* Given an IPCDataTransferItem that has a flavor for which IsFlavorImage
* returns true and whose IPCDataTransferData is of type nsCString (raw image
* data), construct an imgIContainer for the image encoded by the transfer
* item.
*/
static nsresult DataTransferItemToImage(const mozilla::dom::IPCDataTransferItem& aItem,
imgIContainer** aContainer);
/**
* Given a flavor obtained from an IPCDataTransferItem or nsITransferable,
* returns true if we should treat the data as an image.
*/
static bool IsFlavorImage(const nsACString& aFlavor);
static nsresult IPCTransferableToTransferable(const mozilla::dom::IPCDataTransfer& aDataTransfer,
const bool& aIsPrivateData,
nsIPrincipal* aRequestingPrincipal,
const nsContentPolicyType& aContentPolicyType,
nsITransferable* aTransferable,
mozilla::dom::nsIContentParent* aContentParent,
mozilla::dom::TabChild* aTabChild);
static void TransferablesToIPCTransferables(nsIArray* aTransferables,
nsTArray<mozilla::dom::IPCDataTransfer>& aIPC,
bool aInSyncMessage,
mozilla::dom::nsIContentChild* aChild,
mozilla::dom::nsIContentParent* aParent);
static void TransferableToIPCTransferable(nsITransferable* aTransferable,
mozilla::dom::IPCDataTransfer* aIPCDataTransfer,
bool aInSyncMessage,
mozilla::dom::nsIContentChild* aChild,
mozilla::dom::nsIContentParent* aParent);
/*
* Get the pixel data from the given source surface and return it as a buffer.
* The length and stride will be assigned from the surface.
*/
static mozilla::UniquePtr<char[]> GetSurfaceData(
mozilla::NotNull<mozilla::gfx::DataSourceSurface*> aSurface,
size_t* aLength, int32_t* aStride);
/*
* Get the pixel data from the given source surface and fill it in Shmem.
* The length and stride will be assigned from the surface.
*/
static mozilla::Maybe<mozilla::ipc::Shmem>
GetSurfaceData(mozilla::gfx::DataSourceSurface* aSurface,
size_t* aLength, int32_t* aStride,
mozilla::ipc::IShmemAllocator* aAlloc);
// Helpers shared by the implementations of nsContentUtils methods and
// nsIDOMWindowUtils methods.
static mozilla::Modifiers GetWidgetModifiers(int32_t aModifiers);
static nsIWidget* GetWidget(nsIPresShell* aPresShell, nsPoint* aOffset);
static int16_t GetButtonsFlagForButton(int32_t aButton);
static mozilla::LayoutDeviceIntPoint ToWidgetPoint(const mozilla::CSSPoint& aPoint,
const nsPoint& aOffset,
nsPresContext* aPresContext);
static nsView* GetViewToDispatchEvent(nsPresContext* aPresContext,
nsIPresShell** aPresShell);
/**
* Synthesize a mouse event to the given widget
* (see nsIDOMWindowUtils.sendMouseEvent).
*/
MOZ_CAN_RUN_SCRIPT
static nsresult SendMouseEvent(const nsCOMPtr<nsIPresShell>& aPresShell,
const nsAString& aType,
float aX,
float aY,
int32_t aButton,
int32_t aButtons,
int32_t aClickCount,
int32_t aModifiers,
bool aIgnoreRootScrollFrame,
float aPressure,
unsigned short aInputSourceArg,
uint32_t aIdentifier,
bool aToWindow,
bool *aPreventDefault,
bool aIsDOMEventSynthesized,
bool aIsWidgetEventSynthesized);
static void FirePageShowEvent(nsIDocShellTreeItem* aItem,
mozilla::dom::EventTarget* aChromeEventHandler,
bool aFireIfShowing);
static void FirePageHideEvent(nsIDocShellTreeItem* aItem,
mozilla::dom::EventTarget* aChromeEventHandler);
static already_AddRefed<nsPIWindowRoot> GetWindowRoot(nsIDocument* aDoc);
/*
* Implements step 3.1 and 3.3 of the Determine request's Referrer algorithm
* from the Referrer Policy specification.
*
* The referrer policy of the document is applied by Necko when using
* channels.
*
* For documents representing an iframe srcdoc attribute, the document sets
* its own URI correctly, so this method simply uses the document's original
* or current URI as appropriate.
*
* aDoc may be null.
*
* https://w3c.github.io/webappsec/specs/referrer-policy/#determine-requests-referrer
*/
static nsresult SetFetchReferrerURIWithPolicy(nsIPrincipal* aPrincipal,
nsIDocument* aDoc,
nsIHttpChannel* aChannel,
mozilla::net::ReferrerPolicy aReferrerPolicy);
/*
* Parse a referrer policy from a Referrer-Policy header
* https://www.w3.org/TR/referrer-policy/#parse-referrer-policy-from-header
*
* @param aHeader the response's Referrer-Policy header to parse
* @return referrer policy from the response header.
*/
static mozilla::net::ReferrerPolicy GetReferrerPolicyFromHeader(const nsAString& aHeader);
static bool IsNonSubresourceRequest(nsIChannel* aChannel);
static bool IsNonSubresourceInternalPolicyType(nsContentPolicyType aType);
// The order of these entries matters, as we use std::min for total ordering
// of permissions. Private Browsing is considered to be more limiting
// then session scoping
enum class StorageAccess {
// Don't allow access to the storage
eDeny = 0,
// Allow access to the storage, but only if it is secure to do so in a
// private browsing context.
ePrivateBrowsing = 1,
// Allow access to the storage, but only persist it for the current session
eSessionScoped = 2,
// Allow access to the storage
eAllow = 3,
// Keep this at the end. Used for serialization, but not a valid value.
eNumValues = 4,
};
/*
* Checks if storage for the given window is permitted by a combination of
* the user's preferences, and whether the window is a third-party iframe.
*
* This logic is intended to be shared between the different forms of
* persistent storage which are available to web pages. Cookies don't use
* this logic, and security logic related to them must be updated separately.
*/
static StorageAccess StorageAllowedForWindow(nsPIDOMWindowInner* aWindow);
/*
* Checks if storage for the given document is permitted by a combination of
* the user's preferences, and whether the document's window is a third-party
* iframe.
*
* Note, this may be used on documents during the loading process where
* the window's extant document has not been set yet. The code in
* StorageAllowedForWindow(), however, will not work in these cases.
*/
static StorageAccess StorageAllowedForDocument(nsIDocument* aDoc);
/*
* Checks if storage should be allowed for a new window with the given
* principal, load URI, and parent.
*/
static StorageAccess StorageAllowedForNewWindow(nsIPrincipal* aPrincipal,
nsIURI* aURI,
nsPIDOMWindowInner* aParent);
/*
* Checks if storage should be allowed for the given channel. The check will
* be based on the channel result principal and, depending on preferences and
* permissions, mozIThirdPartyUtil.isThirdPartyChannel().
*/
static StorageAccess StorageAllowedForChannel(nsIChannel* aChannel);
/*
* Checks if storage for the given principal is permitted by the user's
* preferences. The caller is assumed to not be a third-party iframe.
* (if that is possible, the caller should use StorageAllowedForWindow)
*/
static StorageAccess StorageAllowedForPrincipal(nsIPrincipal* aPrincipal);
/*
* Returns true if this window/channel should disable storages because of the
* anti-tracking feature.
*/
static bool StorageDisabledByAntiTracking(nsPIDOMWindowInner* aWindow,
nsIChannel* aChannel,
nsIURI* aURI);
/*
* Returns true if this window/channel is a 3rd party context.
*/
static bool IsThirdPartyWindowOrChannel(nsPIDOMWindowInner* aWindow,
nsIChannel* aChannel,
nsIURI* aURI);
/*
* Returns true if this window's channel has been marked as a tracking
* resource.
*/
static bool IsTrackingResourceWindow(nsPIDOMWindowInner* aWindow);
/*
* Serializes a HTML nsINode into its markup representation.
*/
static bool SerializeNodeToMarkup(nsINode* aRoot,
bool aDescendentsOnly,
nsAString& aOut);
/*
* Returns true iff the provided JSObject is a global, and its URI matches
* the provided about: URI.
* @param aGlobal the JSObject whose URI to check, if it is a global.
* @param aUri the URI to match, e.g. "about:feeds"
*/
static bool IsSpecificAboutPage(JSObject* aGlobal, const char* aUri);
static void SetScrollbarsVisibility(nsIDocShell* aDocShell, bool aVisible);
/*
* Return the associated presentation URL of the presented content.
* Will return empty string if the docshell is not in a presented content.
*/
static void GetPresentationURL(nsIDocShell* aDocShell, nsAString& aPresentationUrl);
/*
* Try to find the docshell corresponding to the given event target.
*/
static nsIDocShell* GetDocShellForEventTarget(mozilla::dom::EventTarget* aTarget);
/**
* Returns true if the "HTTPS state" of the document should be "modern". See:
*
* https://html.spec.whatwg.org/#concept-document-https-state
* https://fetch.spec.whatwg.org/#concept-response-https-state
*/
static bool HttpsStateIsModern(nsIDocument* aDocument);
/**
* Try to upgrade an element.
* https://html.spec.whatwg.org/multipage/custom-elements.html#concept-try-upgrade
*/
static void TryToUpgradeElement(Element* aElement);
/**
* Creates a new XUL or XHTML element applying any appropriate custom element
* definition.
*/
static nsresult NewXULOrHTMLElement(Element** aResult, mozilla::dom::NodeInfo* aNodeInfo,
mozilla::dom::FromParser aFromParser, nsAtom* aIsAtom,
mozilla::dom::CustomElementDefinition* aDefinition);
/**
* Looking up a custom element definition.
* https://html.spec.whatwg.org/#look-up-a-custom-element-definition
*/
static mozilla::dom::CustomElementDefinition*
LookupCustomElementDefinition(nsIDocument* aDoc,
nsAtom* aNameAtom,
uint32_t aNameSpaceID,
nsAtom* aTypeAtom);
static void RegisterCallbackUpgradeElement(Element* aElement,
nsAtom* aTypeName);
static void RegisterUnresolvedElement(Element* aElement, nsAtom* aTypeName);
static void UnregisterUnresolvedElement(Element* aElement);
static void EnqueueUpgradeReaction(Element* aElement,
mozilla::dom::CustomElementDefinition* aDefinition);
static void EnqueueLifecycleCallback(nsIDocument::ElementCallbackType aType,
Element* aCustomElement,
mozilla::dom::LifecycleCallbackArgs* aArgs = nullptr,
mozilla::dom::LifecycleAdoptedCallbackArgs* aAdoptedCallbackArgs = nullptr,
mozilla::dom::CustomElementDefinition* aDefinition = nullptr);
static bool AttemptLargeAllocationLoad(nsIHttpChannel* aChannel);
/**
* Appends all "document level" native anonymous content subtree roots for
* aDocument to aElements. Document level NAC subtrees are those created
* by ancestor frames of the document element's primary frame, such as
* the scrollbar elements created by the root scroll frame.
*/
static void AppendDocumentLevelNativeAnonymousContentTo(
nsIDocument* aDocument,
nsTArray<nsIContent*>& aElements);
/**
* Appends all native anonymous content subtree roots generated by `aContent`
* to `aKids`.
*
* See `AllChildrenIterator` for the description of the `aFlags` parameter.
*/
static void AppendNativeAnonymousChildren(const nsIContent* aContent,
nsTArray<nsIContent*>& aKids,
uint32_t aFlags);
/**
* Query triggeringPrincipal if there's a 'triggeringprincipal' attribute on
* aLoadingNode, if no such attribute is specified, aDefaultPrincipal is
* returned if it is provided, otherwise the NodePrincipal of aLoadingNode is
* returned.
*
* Return true if aLoadingNode has a 'triggeringprincipal' attribute, and
* the value 'triggeringprincipal' is also successfully deserialized, otherwise
* return false.
*/
static bool
QueryTriggeringPrincipal(nsIContent* aLoadingNode,
nsIPrincipal* aDefaultPrincipal,
nsIPrincipal** aTriggeringPrincipal);
static bool
QueryTriggeringPrincipal(nsIContent* aLoadingNode,
nsIPrincipal** aTriggeringPrincipal)
{
return QueryTriggeringPrincipal(aLoadingNode, nullptr, aTriggeringPrincipal);
}
/**
* Returns the content policy type that should be used for loading images
* for displaying in the UI. The sources of such images can be <xul:image>,
* <xul:menuitem> on OSX where we load the image through nsMenuItemIconX, etc.
*/
static void
GetContentPolicyTypeForUIImageLoading(nsIContent* aLoadingNode,
nsIPrincipal** aTriggeringPrincipal,
nsContentPolicyType& aContentPolicyType,
uint64_t* aRequestContextID);
static nsresult
CreateJSValueFromSequenceOfObject(JSContext* aCx,
const mozilla::dom::Sequence<JSObject*>& aTransfer,
JS::MutableHandle<JS::Value> aValue);
static bool
IsShadowDOMEnabled() { return sIsShadowDOMEnabled; }
/**
* Returns true if reserved key events should be prevented from being sent
* to their target. Instead, the key event should be handled by chrome only.
*/
static bool ShouldBlockReservedKeys(mozilla::WidgetKeyboardEvent* aKeyEvent);
/**
* Returns the nsIPluginTag for the plugin we should try to use for a given
* MIME type.
*
* @param aMIMEType The MIME type of the document being loaded.
* @param aNoFakePlugin If false then this method should consider JS plugins.
*/
static already_AddRefed<nsIPluginTag>
PluginTagForType(const nsCString& aMIMEType, bool aNoFakePlugin);
/**
* Returns one of the nsIObjectLoadingContent::TYPE_ values describing the
* content type which will be used for the given MIME type when loaded within
* an nsObjectLoadingContent.
*
* NOTE: This method doesn't take capabilities into account. The caller must
* take that into account.
*
* @param aMIMEType The MIME type of the document being loaded.
* @param aNoFakePlugin If false then this method should consider JS plugins.
* @param aContent The nsIContent object which is performing the load. May be
* nullptr in which case the docshell's plugin permissions
* will not be checked.
*/
static uint32_t
HtmlObjectContentTypeForMIMEType(const nsCString& aMIMEType,
bool aNoFakePlugin,
nsIContent* aContent);
static already_AddRefed<nsISerialEventTarget>
GetEventTargetByLoadInfo(nsILoadInfo* aLoadInfo, mozilla::TaskCategory aCategory);
/**
* Detect whether a string is a local-url.
* https://drafts.csswg.org/css-values/#local-urls
*/
static bool
IsLocalRefURL(const nsString& aString);
/**
* Detect whether a string is a local-url.
* https://drafts.csswg.org/css-values/#local-urls
*/
static bool
IsLocalRefURL(const nsACString& aString);
static bool
IsCustomElementsEnabled() { return sIsCustomElementsEnabled; }
/**
* Compose a tab id with process id and a serial number.
*/
static uint64_t GenerateTabId();
/**
* Check whether we should skip moving the cursor for a same-value .value set
* on a text input or textarea.
*/
static bool
SkipCursorMoveForSameValueSet() { return sSkipCursorMoveForSameValueSet; }
/**
* Determine whether or not the user is currently interacting with the web
* browser. This method is safe to call from off of the main thread.
*/
static bool
GetUserIsInteracting();
// Check pref "privacy.trackingprotection.lower_network_priority" to see
// if we want to lower the priority of the channel.
static bool IsLowerNetworkPriority() { return sLowerNetworkPriority; }
// Whether tracker tailing is turned on - "network.http.tailing.enabled".
static bool IsTailingEnabled() { return sTailingEnabled; }
// Check pref "dom.placeholder.show_on_focus" to see
// if we want to show the placeholder inside input elements
// when they have focus.
static bool ShowInputPlaceholderOnFocus() { return sShowInputPlaceholderOnFocus; }
// Check pref "browser.autofocus" to see if we want to enable autofocusing elements
// when the page requests it.
static bool AutoFocusEnabled() { return sAutoFocusEnabled; }
// Check pref "dom.script_loader.bytecode_cache.enabled" to see
// if we want to cache JS bytecode on the cache entry.
static bool IsBytecodeCacheEnabled() { return sIsBytecodeCacheEnabled; }
// Check pref "dom.script_loader.bytecode_cache.strategy" to see which
// heuristic strategy should be used to trigger the caching of the bytecode.
static int32_t BytecodeCacheStrategy() { return sBytecodeCacheStrategy; }
// Alternate data MIME type used by the ScriptLoader to register and read
// bytecode out of the nsCacheInfoChannel.
static nsCString& JSBytecodeMimeType() { return *sJSBytecodeMimeType; }
/**
* Checks if the passed-in name should override an existing name on the
* window. Values which should not override include: "", "_blank", "_top",
* "_parent" and "_self".
*/
static bool IsOverridingWindowName(const nsAString& aName);
/**
* If there is a SourceMap (higher precedence) or X-SourceMap (lower
* precedence) response header in |aChannel|, set |aResult| to the
* header's value and return true. Otherwise, return false.
*
* @param aChannel The HTTP channel
* @param aResult The string result.
*/
static bool GetSourceMapURL(nsIHttpChannel* aChannel, nsACString& aResult);
/**
* Returns true if the passed-in mesasge is a pending InputEvent.
*
* @param aMsg The message to check
*/
static bool IsMessageInputEvent(const IPC::Message& aMsg);
static void AsyncPrecreateStringBundles();
static bool ContentIsLink(nsIContent* aContent);
static already_AddRefed<mozilla::dom::EventTarget>
TryGetTabChildGlobalAsEventTarget(nsISupports* aFrom);
static PopupControlState
PushPopupControlState(PopupControlState aState, bool aForce)
{
MOZ_ASSERT(NS_IsMainThread());
PopupControlState old = sPopupControlState;
if (aState < old || aForce) {
sPopupControlState = aState;
}
return old;
}
static void
PopPopupControlState(PopupControlState aState)
{
MOZ_ASSERT(NS_IsMainThread());
sPopupControlState = aState;
}
static PopupControlState GetPopupControlState() { return sPopupControlState; }
// Get a serial number for a newly created inner or outer window.
static uint32_t InnerOrOuterWindowCreated();
// Record that an inner or outer window has been destroyed.
static void InnerOrOuterWindowDestroyed();
// Get the current number of inner or outer windows.
static int32_t GetCurrentInnerOrOuterWindowCount() { return sInnerOrOuterWindowCount; }
static bool CanShowPopup(nsIPrincipal* aPrincipal);
private:
static bool InitializeEventTable();
static nsresult EnsureStringBundle(PropertiesFile aFile);
static bool CanCallerAccess(nsIPrincipal* aSubjectPrincipal,
nsIPrincipal* aPrincipal);
static nsresult WrapNative(JSContext *cx, nsISupports *native,
nsWrapperCache *cache, const nsIID* aIID,
JS::MutableHandle<JS::Value> vp,
bool aAllowWrapping);
static nsresult DispatchEvent(nsIDocument* aDoc,
nsISupports* aTarget,
const nsAString& aEventName,
CanBubble,
Cancelable,
Trusted,
bool* aDefaultAction = nullptr,
ChromeOnlyDispatch = ChromeOnlyDispatch::eNo);
static nsresult DispatchEvent(nsIDocument* aDoc,
nsISupports* aTarget,
mozilla::WidgetEvent& aWidgetEvent,
EventMessage aEventMessage,
CanBubble,
Cancelable,
Trusted,
bool* aDefaultAction = nullptr,
ChromeOnlyDispatch = ChromeOnlyDispatch::eNo);
static void InitializeModifierStrings();
static void DropFragmentParsers();
static bool MatchClassNames(mozilla::dom::Element* aElement,
int32_t aNamespaceID,
nsAtom* aAtom, void* aData);
static void DestroyClassNameArray(void* aData);
static void* AllocClassMatchingInfo(nsINode* aRootNode,
const nsString* aClasses);
static mozilla::EventClassID
GetEventClassIDFromMessage(EventMessage aEventMessage);
// Fills in aInfo with the tokens from the supplied autocomplete attribute.
static AutocompleteAttrState InternalSerializeAutocompleteAttribute(const nsAttrValue* aAttrVal,
mozilla::dom::AutocompleteInfo& aInfo,
bool aGrantAllValidValue = false);
static bool CallOnAllRemoteChildren(mozilla::dom::MessageBroadcaster* aManager,
CallOnRemoteChildFunction aCallback,
void* aArg);
/**
* Gets the current cookie lifetime policy and cookie behavior for a given
* principal by checking with preferences and the permission manager.
*
* Used in the implementation of InternalStorageAllowedForPrincipal.
*/
static void GetCookieBehaviorForPrincipal(nsIPrincipal* aPrincipal,
uint32_t* aLifetimePolicy,
uint32_t* aBehavior);
/*
* Checks if storage for a given principal is permitted by the user's
* preferences. If aWindow is non-null, its principal must be passed as
* aPrincipal, and the third-party iframe and sandboxing status of the window
* are also checked. If aURI is non-null, then it is used as the comparison
* against aWindow to determine if this is a third-party load. We also
* allow a channel instead of the window reference when determining 3rd party
* status.
*
* Used in the implementation of StorageAllowedForWindow and
* StorageAllowedForPrincipal.
*/
static StorageAccess InternalStorageAllowedForPrincipal(nsIPrincipal* aPrincipal,
nsPIDOMWindowInner* aWindow,
nsIURI* aURI,
nsIChannel* aChannel);
static nsINode* GetCommonAncestorHelper(nsINode* aNode1, nsINode* aNode2);
static nsIContent* GetCommonFlattenedTreeAncestorHelper(nsIContent* aContent1,
nsIContent* aContent2);
static nsIXPConnect *sXPConnect;
static nsIScriptSecurityManager *sSecurityManager;
static nsIPrincipal *sSystemPrincipal;
static nsIPrincipal *sNullSubjectPrincipal;
static nsNameSpaceManager *sNameSpaceManager;
static nsIIOService *sIOService;
static nsIUUIDGenerator *sUUIDGenerator;
static nsIConsoleService* sConsoleService;
static nsDataHashtable<nsRefPtrHashKey<nsAtom>, EventNameMapping>* sAtomEventTable;
static nsDataHashtable<nsStringHashKey, EventNameMapping>* sStringEventTable;
static nsTArray<RefPtr<nsAtom>>* sUserDefinedEvents;
static nsIStringBundleService* sStringBundleService;
static nsIStringBundle* sStringBundles[PropertiesFile_COUNT];
class nsContentUtilsReporter;
static nsIContentPolicy* sContentPolicyService;
static bool sTriedToGetContentPolicy;
static RefPtr<mozilla::intl::LineBreaker> sLineBreaker;
static RefPtr<mozilla::intl::WordBreaker> sWordBreaker;
static nsIBidiKeyboard* sBidiKeyboard;
static bool sInitialized;
static uint32_t sScriptBlockerCount;
static uint32_t sDOMNodeRemovedSuppressCount;
// Not an nsCOMArray because removing elements from those is slower
static AutoTArray<nsCOMPtr<nsIRunnable>, 8>* sBlockedScriptRunners;
static uint32_t sRunnersCountAtFirstBlocker;
static uint32_t sScriptBlockerCountWhereRunnersPrevented;
static nsIInterfaceRequestor* sSameOriginChecker;
static bool sIsHandlingKeyBoardEvent;
static bool sAllowXULXBL_for_file;
static bool sDisablePopups;
static bool sIsFullScreenApiEnabled;
static bool sIsUnprefixedFullscreenApiEnabled;
static bool sTrustedFullScreenOnly;
static bool sIsCutCopyAllowed;
static uint32_t sHandlingInputTimeout;
static bool sIsPerformanceTimingEnabled;
static bool sIsResourceTimingEnabled;
static bool sIsPerformanceNavigationTimingEnabled;
static bool sIsUpgradableDisplayContentPrefEnabled;
static bool sIsFrameTimingPrefEnabled;
static bool sIsFormAutofillAutocompleteEnabled;
static bool sIsShadowDOMEnabled;
static bool sIsCustomElementsEnabled;
static bool sSendPerformanceTimingNotifications;
static bool sUseActivityCursor;
static bool sAnimationsAPICoreEnabled;
static bool sAnimationsAPIElementAnimateEnabled;
static bool sGetBoxQuadsEnabled;
static bool sSkipCursorMoveForSameValueSet;
static bool sRequestIdleCallbackEnabled;
static bool sLowerNetworkPriority;
static bool sTailingEnabled;
static bool sShowInputPlaceholderOnFocus;
static bool sAutoFocusEnabled;
#ifndef RELEASE_OR_BETA
static bool sBypassCSSOMOriginCheck;
#endif
static bool sIsBytecodeCacheEnabled;
static int32_t sBytecodeCacheStrategy;
static uint32_t sCookiesLifetimePolicy;
static uint32_t sCookiesBehavior;
static bool sShortcutsCustomized;
static int32_t sPrivacyMaxInnerWidth;
static int32_t sPrivacyMaxInnerHeight;
class UserInteractionObserver;
static UserInteractionObserver* sUserInteractionObserver;
static nsHtml5StringParser* sHTMLFragmentParser;
static nsIParser* sXMLFragmentParser;
static nsIFragmentContentSink* sXMLFragmentSink;
/**
* True if there's a fragment parser activation on the stack.
*/
static bool sFragmentParsingActive;
static nsString* sShiftText;
static nsString* sControlText;
static nsString* sMetaText;
static nsString* sOSText;
static nsString* sAltText;
static nsString* sModifierSeparator;
// Alternate data mime type, used by the ScriptLoader to register and read the
// bytecode out of the nsCacheInfoChannel.
static nsCString* sJSBytecodeMimeType;
static bool sDoNotTrackEnabled;
static mozilla::LazyLogModule sDOMDumpLog;
static PopupControlState sPopupControlState;
static int32_t sInnerOrOuterWindowCount;
static uint32_t sInnerOrOuterWindowSerialCounter;
};
/* static */ inline
nsContentPolicyType
nsContentUtils::InternalContentPolicyTypeToExternal(nsContentPolicyType aType)
{
switch (aType) {
case nsIContentPolicy::TYPE_INTERNAL_SCRIPT:
case nsIContentPolicy::TYPE_INTERNAL_SCRIPT_PRELOAD:
case nsIContentPolicy::TYPE_INTERNAL_WORKER:
case nsIContentPolicy::TYPE_INTERNAL_SHARED_WORKER:
case nsIContentPolicy::TYPE_INTERNAL_SERVICE_WORKER:
case nsIContentPolicy::TYPE_INTERNAL_WORKER_IMPORT_SCRIPTS:
return nsIContentPolicy::TYPE_SCRIPT;
case nsIContentPolicy::TYPE_INTERNAL_EMBED:
case nsIContentPolicy::TYPE_INTERNAL_OBJECT:
return nsIContentPolicy::TYPE_OBJECT;
case nsIContentPolicy::TYPE_INTERNAL_FRAME:
case nsIContentPolicy::TYPE_INTERNAL_IFRAME:
return nsIContentPolicy::TYPE_SUBDOCUMENT;
case nsIContentPolicy::TYPE_INTERNAL_AUDIO:
case nsIContentPolicy::TYPE_INTERNAL_VIDEO:
case nsIContentPolicy::TYPE_INTERNAL_TRACK:
return nsIContentPolicy::TYPE_MEDIA;
case nsIContentPolicy::TYPE_INTERNAL_XMLHTTPREQUEST:
case nsIContentPolicy::TYPE_INTERNAL_EVENTSOURCE:
return nsIContentPolicy::TYPE_XMLHTTPREQUEST;
case nsIContentPolicy::TYPE_INTERNAL_IMAGE:
case nsIContentPolicy::TYPE_INTERNAL_IMAGE_PRELOAD:
case nsIContentPolicy::TYPE_INTERNAL_IMAGE_FAVICON:
return nsIContentPolicy::TYPE_IMAGE;
case nsIContentPolicy::TYPE_INTERNAL_STYLESHEET:
case nsIContentPolicy::TYPE_INTERNAL_STYLESHEET_PRELOAD:
return nsIContentPolicy::TYPE_STYLESHEET;
default:
return aType;
}
}
/* static */ inline
nsContentPolicyType
nsContentUtils::InternalContentPolicyTypeToExternalOrWorker(nsContentPolicyType aType)
{
switch (aType) {
case nsIContentPolicy::TYPE_INTERNAL_WORKER:
case nsIContentPolicy::TYPE_INTERNAL_SHARED_WORKER:
case nsIContentPolicy::TYPE_INTERNAL_SERVICE_WORKER:
return aType;
default:
return InternalContentPolicyTypeToExternal(aType);
}
}
class MOZ_RAII nsAutoScriptBlocker {
public:
explicit nsAutoScriptBlocker(MOZ_GUARD_OBJECT_NOTIFIER_ONLY_PARAM) {
MOZ_GUARD_OBJECT_NOTIFIER_INIT;
nsContentUtils::AddScriptBlocker();
}
~nsAutoScriptBlocker() {
nsContentUtils::RemoveScriptBlocker();
}
private:
MOZ_DECL_USE_GUARD_OBJECT_NOTIFIER
};
class MOZ_STACK_CLASS nsAutoScriptBlockerSuppressNodeRemoved :
public nsAutoScriptBlocker {
public:
nsAutoScriptBlockerSuppressNodeRemoved() {
++nsContentUtils::sDOMNodeRemovedSuppressCount;
}
~nsAutoScriptBlockerSuppressNodeRemoved() {
--nsContentUtils::sDOMNodeRemovedSuppressCount;
}
};
namespace mozilla {
namespace dom {
class TreeOrderComparator {
public:
bool Equals(nsINode* aElem1, nsINode* aElem2) const {
return aElem1 == aElem2;
}
bool LessThan(nsINode* aElem1, nsINode* aElem2) const {
return nsContentUtils::PositionIsBefore(aElem1, aElem2);
}
};
} // namespace dom
} // namespace mozilla
#define NS_INTERFACE_MAP_ENTRY_TEAROFF(_interface, _allocator) \
if (aIID.Equals(NS_GET_IID(_interface))) { \
foundInterface = static_cast<_interface *>(_allocator); \
if (!foundInterface) { \
*aInstancePtr = nullptr; \
return NS_ERROR_OUT_OF_MEMORY; \
} \
} else
/*
* In the following helper macros we exploit the fact that the result of a
* series of additions will not be finite if any one of the operands in the
* series is not finite.
*/
#define NS_ENSURE_FINITE(f, rv) \
if (!mozilla::IsFinite(f)) { \
return (rv); \
}
#define NS_ENSURE_FINITE2(f1, f2, rv) \
if (!mozilla::IsFinite((f1)+(f2))) { \
return (rv); \
}
#define NS_ENSURE_FINITE4(f1, f2, f3, f4, rv) \
if (!mozilla::IsFinite((f1)+(f2)+(f3)+(f4))) { \
return (rv); \
}
#define NS_ENSURE_FINITE5(f1, f2, f3, f4, f5, rv) \
if (!mozilla::IsFinite((f1)+(f2)+(f3)+(f4)+(f5))) { \
return (rv); \
}
#define NS_ENSURE_FINITE6(f1, f2, f3, f4, f5, f6, rv) \
if (!mozilla::IsFinite((f1)+(f2)+(f3)+(f4)+(f5)+(f6))) { \
return (rv); \
}
// Deletes a linked list iteratively to avoid blowing up the stack (bug 460444).
#define NS_CONTENT_DELETE_LIST_MEMBER(type_, ptr_, member_) \
{ \
type_ *cur = (ptr_)->member_; \
(ptr_)->member_ = nullptr; \
while (cur) { \
type_ *next = cur->member_; \
cur->member_ = nullptr; \
delete cur; \
cur = next; \
} \
}
#endif /* nsContentUtils_h___ */
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