#1866: Support twitpic source rewriting

* html work page -> full image
* thumbnail -> full image

test/unit/downloads/twitpic_test.rb

@@ -0,0 +1,44 @@
+require 'test_helper'
+
+module Downloads
+  class TwitpicTest < ActiveSupport::TestCase
+    context "a download for a twitpic html page" do
+      setup do
+        @source = "http://twitpic.com/cpprns"
+        @tempfile = Tempfile.new("danbooru-test")
+        @download = Downloads::File.new(@source, @tempfile.path)
+        VCR.use_cassette("download-twitpic-html", :record => :new_episodes) do
+          @download.download!
+        end
+      end
+
+      should "set the direct image link as the source" do
+        assert_equal("http://d3j5vwomefv46c.cloudfront.net/photos/large/768786760.jpg?1368245083", @download.source)
+      end
+
+      should "work" do
+        puts ::File.read(@tempfile.path).inspect
+        assert_equal(89_409, ::File.size(@tempfile.path))
+      end
+    end
+
+    context "a download for a twitpic thumbnail" do
+      setup do
+        @source = "http://d3j5vwomefv46c.cloudfront.net/photos/thumb/768786760.jpg?1368245083"
+        @tempfile = Tempfile.new("danbooru-test")
+        @download = Downloads::File.new(@source, @tempfile.path)
+        VCR.use_cassette("download-twitpic-thumb", :record => :new_episodes) do
+          @download.download!
+        end
+      end
+
+      should "instead download the original version" do
+        assert_equal("http://d3j5vwomefv46c.cloudfront.net/photos/large/768786760.jpg?1368245083", @download.source)
+      end
+
+      should "work" do
+        assert_equal(89_409, ::File.size(@tempfile.path))
+      end
+    end
+  end
+end