875192 - Can't pass Blob to content constructor of WebIDL interface

Status: RESOLVED WORKSFORME

(Core :: DOM: Core & HTML, defect)

Description

[Reuben Morais [:reuben]]

In Contacts, when I receive a Blob from the parent and try to create a mozContact by calling the content constructor, I get TypeError: Value does not implement interface Blob.

I talked to bholley and he thinks this should work.

Comment 1

[Boris Zbarsky [:bzbarsky]]

Steps to reproduce, please (presumably starting with a link to the diff to apply?).  I assume there's security wrapper stuff involved, but without knowing exactly what objects are being passed how and to whom it's hard to do anything with this.

Comment 2

[Reuben Morais [:reuben]]

Attachment: Patch

Because this needs to come from the parent over IPC, I'll just attach my entire patch.

Run ./mach mochitest-plain dom/contacts/tests/test_contacts_blobs.html to reproduce.

Comment 3

[Boris Zbarsky [:bzbarsky]]

Looks like this is just a bug somewhere up the chain; when we get into the message manager in the child we have:

(gdb) p aCloneData->mClosure.mBlobs.Length()
$19 = 0

and when we're trying to convert something to a blob what we have is:

(gdb) p temp.toObject().getClass()->name
$22 = 0x101da2173 "Proxy"
(gdb) p js::GetProxyHandler(&temp.toObject())
$23 = ('js::CrossCompartmentWrapper' *) 0x10201a600
(gdb) p js::GetProxyPrivate(&temp.toObject()).toObject().getClass()->name
$24 = 0x101dd32c5 "Object"

which sure isn't a Blob in any way, shape, or form.

Comment 4

[Boris Zbarsky [:bzbarsky]]

Reuben, is this still an issue?

Comment 5

[Reuben Morais [:reuben]]

No, it isn't.