Github user agamemnus commented on the pull request:
https://github.com/apache/cordova-plugin-whitelist/pull/6#issuecomment-111581796
``cdvfile://`` is a protocol used in Cordova for accessing saved files:
https://github.com/apache/cordova-plugin-file.
Regarding ``content://``, a little back-story which should help explain.
Google Play has a 50 megabyte apk size upload limit. To go beyond that it uses
an expansion file system which allows up to (I think) 2 gigabytes of extra
storage. The expansion files are typically downloaded to and stored in
``Phone/Android/obb`` as zip files with 0 compression ("STORE"). To access the
files Google recommends using a content provider
(http://developer.android.com/guide/topics/providers/content-providers.html).
(A content provider is used for a few more things, as well...)
I made a comprehensive plugin for using these expansion files here:
https://github.com/agamemnus/cordova-plugin-xapkreader/. It links to and makes
use of 2 Android libraries made by Google called ``play_apk_expansion`` and
``play_licensing``. A number of people wanted to use Cordova 5, but the plugin
doesn't work with 5 because ant support is not supported or broken.
Unfortunately, Gradle support is somewhat broken as well as I describe in
https://issues.apache.org/jira/browse/CB-9132.
Even going past the Gradle issues, the whitelist requirement in Cordova 5
means that by default ``content://`` files (the method used to access files in
the zip file) are not usable. There are two fixes to this -- patching the
whitelist plugin, or adding content:// in the CSP tag.
P.S.: Even with this whitelist plugin patch, I am having issues loading JPG
files (but not other types of files) using the ``content://`` protocol (my
Chrome debugger claims that ``content://`` protocol is unrecognized), but this
may be a Chromium or Crosswalk issue.
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