1134391 - [e10s] "View Image/Video" in remote browser causes unsafe CPOW usage warning

Status: RESOLVED FIXED

(Firefox :: Menus, defect)

Description

[Ian Moody [:Kwan] (UTC+0)]

+++ This bug was initially created as a clone of Bug #1133577 +++

STR:

1) Visit a site with images, <canvas/>, or <video/>s on it in an e10s window
2) Right-click on an image, <canvas/> or <video/>, and choose "View Image/Video"

This causes some "unsafe CPOW usage" warnings in the Browser Console.

In browser/base/content/nsContextMenu.js:

  // Change current window to the URL of the image, video, or audio.
  viewMedia: function(e) {
    var viewURL;

    if (this.onCanvas)
      viewURL = this.target.toDataURL(); <-- Causes CPOW warning [canvas]
    else {
      viewURL = this.mediaURL;
      urlSecurityCheck(viewURL,
                       this.browser.contentPrincipal,
                       Ci.nsIScriptSecurityManager.DISALLOW_SCRIPT);
    }

    var doc = this.target.ownerDocument; <-- Causes CPOW warning
    openUILink(viewURL, e, { disallowInheritPrincipal: true,
                             referrerURI: doc.documentURIObject }); <-- Causes CPOW warning
  },


in toolkit/modules/RemoteWebNavigation.jsm

  loadURI: function(aURI, aLoadFlags, aReferrer, aPostData, aHeaders) {
    if (aPostData || aHeaders)
      throw Components.Exception("RemoteWebNavigation doesn't accept postdata or headers.", Cr.NS_ERROR_INVALID_ARGS);

    this._browser._contentTitle = "";
    this._sendMessage("WebNavigation:LoadURI", {
      uri: aURI,
      flags: aLoadFlags,
      referrer: aReferrer ? aReferrer.spec : null <-- Causes CPOW warning
    });
  },


warning tagged [canvas] only occurs on a <canvas/>

Comment 1

[Ian Moody [:Kwan] (UTC+0)]

Attachment: Make "View Image/Media" command use messages to avoid unsafe CPOW warnings

Relies on the gContextMenuContentData.documentURI addition in bug 1133577.

Comment 2

[Ian Moody [:Kwan] (UTC+0)]

Attachment: Make "View Image/Media" command use messages to avoid unsafe CPOW warnings

Updated for latest bug 1133577 patch

Comment 3

[Ian Moody [:Kwan] (UTC+0)]

Attachment: Make "View Image/Media" command use messages to avoid unsafe CPOW warnings

Well this is the next one in my queue, so this can go first.

toDataURL is a separate function so it can be reused for "Save Image As..."ing a canvas later.
Is Cu.reportError the right thing to put for the promise rejection?

Comment 4

[Mike Conley (:mconley) (:⚙️)]

Comment on attachment 8573592 [details] [diff] [review]
Make "View Image/Media" command use messages to avoid unsafe CPOW warnings

Review of attachment 8573592 [details] [diff] [review]:
-----------------------------------------------------------------

::: browser/base/content/nsContextMenu.js
@@ +1026,5 @@
>    },
>  
> +  toDataURL: function(aTarget) {
> +    let mm = this.browser.messageManager;
> +    return new Promise(function(resolve, reject) {

You never use reject, so you can probably drop it.

@@ +1027,5 @@
>  
> +  toDataURL: function(aTarget) {
> +    let mm = this.browser.messageManager;
> +    return new Promise(function(resolve, reject) {
> +      mm.sendAsyncMessage("ContextMenu:ToDataURL", {}, { aTarget });

A DataURL can represent many things. Let's call this message:

ContextMenu:Canvas:ToDataURL

and the function:

canvasToDataURL

Comment 5

[Ian Moody [:Kwan] (UTC+0)]

Attachment: Make "View Image/Video" command use messages to avoid unsafe CPOW warnings

(In reply to Mike Conley (:mconley) - Needinfo me! from comment #4)
> > +    return new Promise(function(resolve, reject) {
> 
> You never use reject, so you can probably drop it.
Cool, done.

> @@ +1027,5 @@
> >  
> > +  toDataURL: function(aTarget) {
> > +    let mm = this.browser.messageManager;
> > +    return new Promise(function(resolve, reject) {
> > +      mm.sendAsyncMessage("ContextMenu:ToDataURL", {}, { aTarget });
> 
> A DataURL can represent many things. Let's call this message:
> 
> ContextMenu:Canvas:ToDataURL
Done.

> and the function:
> 
> canvasToDataURL
Done, plus the _ prefixing as discussed on IRC.

And reverted the argument name back to "target", so the patch actually works again, tested manually.

Comment 6

[Mike Conley (:mconley) (:⚙️)]

Comment on attachment 8574192 [details] [diff] [review]
Make "View Image/Video" command use messages to avoid unsafe CPOW warnings

Review of attachment 8574192 [details] [diff] [review]:
-----------------------------------------------------------------

Looks great! Thanks Ian!

Comment 7

[Ian Moody [:Kwan] (UTC+0)]

Try run at https://treeherder.mozilla.org/#/jobs?repo=try&revision=094396e39ebf
orange caused by the other patch for bug 1141186 and fixed in https://treeherder.mozilla.org/#/jobs?repo=try&revision=d06d6f239f24

Comment 8

[Ryan VanderMeulen [:RyanVM]]

https://hg.mozilla.org/integration/fx-team/rev/839427d11a62

Comment 9

[Wes Kocher (:KWierso) (Not reading bugmail; email directly if needed)]

https://hg.mozilla.org/mozilla-central/rev/839427d11a62