https://bugzilla.wikimedia.org/show_bug.cgi?id=29640

       Web browser: ---
             Bug #: 29640
           Summary: need an easy way to see if a filename is in use via
                    the API (including InstantCommons)
           Product: MediaWiki
           Version: unspecified
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: Unprioritized
         Component: API
        AssignedTo: [email protected]
        ReportedBy: [email protected]
                CC: [email protected], [email protected],
                    [email protected], [email protected]
    Classification: Unclassified


Right now, it seems that the only way to check if a file name is already in use
on Wikipedia is to do api.php?action=query&titles=<imageTitle>&prop=imageinfo

Then you have to do the following awkward test on the results:
if ( !data.query.pages[-1] || data.query.pages[-1].imageinfo) { // image exists

The reason for this is that the API returns a page id for a local image, or -1
for no image. However, it also returns -1 if it finds an image through
InstantCommons.

It would be nice if there was a simpler way to do this. Maybe
prop=filenameinuse that just returns true or false. There are two uses for
this: 1) Making sure that an image someone wants to use for something on-wiki
actually exists before they use it. 2) Making sure that uploading scripts don't
upload over other files.

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