Merge pull request code-dot-org#8332 from code-dot-org/levelSourceScript

Creates the bin/oneoff directory and adds invalidate_level_source_images.

Author: ashercodeorg

bin/oneoff/README.md

@@ -0,0 +1,5 @@
+This directory is intended as a repository of scripts having some (at most)
+short lived purpose. Any scripts having ongoing value should reside elsewhere.
+
+Since many of these scripts would be harmful if accidentally run, consider
+chmod'ing them without the executable bit set.

bin/oneoff/invalidate_level_source_images

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+#!/usr/bin/env ruby
+# Found on production-console in May 2016, with no knowledge beyond its
+# contents.
+# ubuntu@production-console:~$ ls -l invalidate_level_source_images
+# -rw-r--r-- 1 ubuntu ubuntu 845 Nov 25  2014 invalidate_level_source_images
+
+require_relative '../../config/environment'
+
+# invalidate level_source_images by breaking the md5. Future solutions
+# will now create a new LevelSource because it can't find the existing
+# one.
+
+# Some bad level_source_images may have been created before this bug
+# was fixed:
+# https://github.com/code-dot-org/code-dot-org/commit/1db0dfffb2c1a3634d467b67138b31eb3de257b9
+# we want to change the urls (eg: http://studio.code.org/sh/47434474/)
+# by generating a new level source id (instead of just fixing the
+# image) because facebook hangs on to images in the cache for too
+# long.
+
+LevelSource.where(level_id: Script.find_by_name('frozen').level_ids).
+  where('created_at < ?', '2014-11-20').each do |level_source|
+  new_md5 = ("invalid-" + level_source.md5).slice(0..31)
+  level_source.update_attribute(:md5, new_md5)
+end