Bug 1816740 [5/6] - convert nsIFilePicker::capture* to a proper enum r=ipc-reviewers,karlt,mstange,handyman,nika

Convert the various capture* constants in nsIFilePicker into a proper
enum, and perform validation when passing it across IPC.

Additionally, unlike the previous two enums, reduce the size of
CaptureTarget to 8 bits. This is a workaround for its use with
nsAttrValue, which at present very specifically requires that parseable
enums' values fit within an `int16_t` -- and a `uint16_t` does not.

Differential Revision: https://phabricator.services.mozilla.com/D169854

dom/html/HTMLInputElement.cpp

@@ -181,10 +181,10 @@ static const nsAttrValue::EnumTable* kInputDefaultType =
     &kInputTypeTable[ArrayLength(kInputTypeTable) - 2];
 
 static const nsAttrValue::EnumTable kCaptureTable[] = {
-    {"user", static_cast<int16_t>(nsIFilePicker::captureUser)},
+    {"user", nsIFilePicker::captureUser},
-    {"environment", static_cast<int16_t>(nsIFilePicker::captureEnv)},
+    {"environment", nsIFilePicker::captureEnv},
-    {"", static_cast<int16_t>(nsIFilePicker::captureDefault)},
+    {"", nsIFilePicker::captureDefault},
-    {nullptr, static_cast<int16_t>(nsIFilePicker::captureNone)}};
+    {nullptr, nsIFilePicker::captureNone}};
 
 static const nsAttrValue::EnumTable* kCaptureDefault = &kCaptureTable[2];
 
@@ -831,7 +831,8 @@ nsresult HTMLInputElement::InitFilePicker(FilePickerType aType) {
       const nsAttrValue* captureVal =
           GetParsedAttr(nsGkAtoms::capture, kNameSpaceID_None);
       if (captureVal) {
-        filePicker->SetCapture(captureVal->GetEnumValue());
+        filePicker->SetCapture(static_cast<nsIFilePicker::CaptureTarget>(
+            captureVal->GetEnumValue()));
       }
     }
   } else {

dom/ipc/FilePickerMessageUtils.h

@@ -17,6 +17,13 @@ struct ParamTraits<nsIFilePicker::Mode>
           nsIFilePicker::Mode, nsIFilePicker::Mode::modeOpen,
           nsIFilePicker::Mode::modeGetFolder> {};
 
+template <>
+struct ParamTraits<nsIFilePicker::CaptureTarget>
+    : public ContiguousEnumSerializerInclusive<
+          nsIFilePicker::CaptureTarget,
+          nsIFilePicker::CaptureTarget::captureNone,
+          nsIFilePicker::CaptureTarget::captureEnv> {};
+
 template <>
 struct ParamTraits<nsIFilePicker::ResultCode>
     : public ContiguousEnumSerializerInclusive<

dom/ipc/FilePickerParent.cpp

@@ -242,7 +242,7 @@ mozilla::ipc::IPCResult FilePickerParent::RecvOpen(
     nsTArray<nsString>&& aFilters, nsTArray<nsString>&& aFilterNames,
     nsTArray<nsString>&& aRawFilters, const nsString& aDisplayDirectory,
     const nsString& aDisplaySpecialDirectory, const nsString& aOkButtonLabel,
-    const int16_t& aCapture) {
+    const nsIFilePicker::CaptureTarget& aCapture) {
   if (!CreateFilePicker()) {
     Unused << Send__delete__(this, void_t(), nsIFilePicker::returnCancel);
     return IPC_OK();

dom/ipc/FilePickerParent.h

@@ -42,7 +42,7 @@ class FilePickerParent : public PFilePickerParent {
       nsTArray<nsString>&& aFilters, nsTArray<nsString>&& aFilterNames,
       nsTArray<nsString>&& aRawFilters, const nsString& aDisplayDirectory,
       const nsString& aDisplaySpecialDirectory, const nsString& aOkButtonLabel,
-      const int16_t& aCapture);
+      const nsIFilePicker::CaptureTarget& aCapture);
 
   virtual void ActorDestroy(ActorDestroyReason aWhy) override;
 

dom/ipc/PFilePicker.ipdl

@@ -11,6 +11,7 @@ include IPCBlob;
 include "mozilla/dom/FilePickerMessageUtils.h";
 
 using struct mozilla::void_t from "mozilla/ipc/IPCCore.h";
+using nsIFilePicker::CaptureTarget from "nsIFilePicker.h";
 using nsIFilePicker::ResultCode from "nsIFilePicker.h";
 
 namespace mozilla {
@@ -43,7 +44,7 @@ parent:
                nsString defaultExtension, nsString[] filters, nsString[] filterNames,
                nsString[] rawFilters, nsString displayDirectory,
                nsString displaySpecialDirectory, nsString okButtonLabel,
-               int16_t capture);
+               CaptureTarget capture);
 
 child:
     async __delete__(MaybeInputData data, ResultCode result);

widget/nsBaseFilePicker.cpp

@@ -245,12 +245,16 @@ NS_IMETHODIMP nsBaseFilePicker::AppendRawFilter(const nsAString& aFilter) {
   return NS_OK;
 }
 
-NS_IMETHODIMP nsBaseFilePicker::GetCapture(int16_t* aCapture) {
+NS_IMETHODIMP nsBaseFilePicker::GetCapture(
-  *aCapture = 0;
+    nsIFilePicker::CaptureTarget* aCapture) {
+  *aCapture = nsIFilePicker::CaptureTarget::captureNone;
   return NS_OK;
 }
 
-NS_IMETHODIMP nsBaseFilePicker::SetCapture(int16_t aCapture) { return NS_OK; }
+NS_IMETHODIMP nsBaseFilePicker::SetCapture(
+    nsIFilePicker::CaptureTarget aCapture) {
+  return NS_OK;
+}
 
 // Set the filter index
 NS_IMETHODIMP nsBaseFilePicker::GetFilterIndex(int32_t* aFilterIndex) {

widget/nsBaseFilePicker.h

@@ -31,8 +31,8 @@ class nsBaseFilePicker : public nsIFilePicker {
   NS_IMETHOD Open(nsIFilePickerShownCallback* aCallback) override;
   NS_IMETHOD AppendFilters(int32_t filterMask) override;
   NS_IMETHOD AppendRawFilter(const nsAString& aFilter) override;
-  NS_IMETHOD GetCapture(int16_t* aCapture) override;
+  NS_IMETHOD GetCapture(nsIFilePicker::CaptureTarget* aCapture) override;
-  NS_IMETHOD SetCapture(int16_t aCapture) override;
+  NS_IMETHOD SetCapture(nsIFilePicker::CaptureTarget aCapture) override;
   NS_IMETHOD GetFilterIndex(int32_t* aFilterIndex) override;
   NS_IMETHOD SetFilterIndex(int32_t aFilterIndex) override;
   NS_IMETHOD GetFiles(nsISimpleEnumerator** aFiles) override;

widget/nsFilePickerProxy.cpp

@@ -54,13 +54,13 @@ nsFilePickerProxy::AppendFilter(const nsAString& aTitle,
 }
 
 NS_IMETHODIMP
-nsFilePickerProxy::GetCapture(int16_t* aCapture) {
+nsFilePickerProxy::GetCapture(nsIFilePicker::CaptureTarget* aCapture) {
   *aCapture = mCapture;
   return NS_OK;
 }
 
 NS_IMETHODIMP
-nsFilePickerProxy::SetCapture(int16_t aCapture) {
+nsFilePickerProxy::SetCapture(nsIFilePicker::CaptureTarget aCapture) {
   mCapture = aCapture;
   return NS_OK;
 }

widget/nsFilePickerProxy.h

@@ -37,8 +37,8 @@ class nsFilePickerProxy : public nsBaseFilePicker,
                   nsIFilePicker::Mode aMode) override;
   NS_IMETHOD AppendFilter(const nsAString& aTitle,
                           const nsAString& aFilter) override;
-  NS_IMETHOD GetCapture(int16_t* aCapture) override;
+  NS_IMETHOD GetCapture(nsIFilePicker::CaptureTarget* aCapture) override;
-  NS_IMETHOD SetCapture(int16_t aCapture) override;
+  NS_IMETHOD SetCapture(nsIFilePicker::CaptureTarget aCapture) override;
   NS_IMETHOD GetDefaultString(nsAString& aDefaultString) override;
   NS_IMETHOD SetDefaultString(const nsAString& aDefaultString) override;
   NS_IMETHOD GetDefaultExtension(nsAString& aDefaultExtension) override;
@@ -74,7 +74,7 @@ class nsFilePickerProxy : public nsBaseFilePicker,
   nsString mFile;
   nsString mDefault;
   nsString mDefaultExtension;
-  int16_t mCapture;
+  nsIFilePicker::CaptureTarget mCapture;
 
   bool mIPCActive;
 

widget/nsIFilePicker.idl

@@ -53,10 +53,12 @@ interface nsIFilePicker : nsISupports
                                                 // *.rm; *.rmvb; *.smil; *.webm;
                                                 // *.wmv; *.xvid
 
-  const short captureNone     = 0;              // No capture target specified.
+  cenum CaptureTarget: 8 {
-  const short captureDefault  = 1;              // Missing/invalid value default.
+    captureNone     = 0,                        // No capture target specified.
-  const short captureUser     = 2;              // "user" capture target specified.
+    captureDefault  = 1,                        // Missing/invalid value default.
-  const short captureEnv      = 3;              // "environment" capture target specified.
+    captureUser     = 2,                        // "user" capture target specified.
+    captureEnv      = 3,                        // "environment" capture target specified.
+  };
 
  /**
   * Initialize the file picker widget.  The file picker is not valid until this
@@ -206,7 +208,12 @@ interface nsIFilePicker : nsISupports
    */
   attribute AString okButtonLabel;
 
-  attribute short capture;
+  /**
+   * Implementation of HTMLInputElement's `capture` property.
+   *
+   * Not used by Firefox Desktop.
+   */
+  attribute nsIFilePicker_CaptureTarget capture;
 };
 
 [scriptable, function, uuid(0d79adad-b244-49A5-9997-2a8cad93fc44)]