https://bugzilla.wikimedia.org/show_bug.cgi?id=32195

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             Bug #: 32195
           Summary: Inconsistent Title validation in File & FileRepo
           Product: MediaWiki
           Version: 1.19-svn
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: Unprioritized
         Component: Images and files
        AssignedTo: [email protected]
        ReportedBy: [email protected]
                CC: [email protected], [email protected]
            Blocks: 32031
    Classification: Unclassified


Found while investigating bug 32031 -- a lot of File & FileRepo functions
accept either a string or a Title object as a reference, normalizing strings to
titles with forced NS_FILE and aborting if it's an invalid title object.

However a) this code is duplicated in many functions and b) few or none of them
seem to validate a Title object that gets passed in. As a result some things
seem to sorta work with Media: or other namespaces but somewhere along the line
something breaks.

Should probably have a common input validation function for these methods to
use, which will:
* do the string to title conversion
* discard invalid title objects
* normalize NS_MEDIA to NS_FILE
* discard title objects in non-file namespaces

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