iqdb: update API client to use new version of IQDB.

Replace the old IQDB API client with a new client for the new forked
version of IQDB at https://github.com/danbooru/iqdb.

Changes:

* The /iqdb_queries endpoint now returns `hash` and `signature` fields.
  The `signature` is the full decoded Haar signature, while the `hash`
  is a encoded version of the signature.
* The /iqdb_queries endpoint no longer returns `width` and `height`
  fields in the response (these were always 128x128).
* We no longer need the IQDBs frontend server, now we talk to the IQDB
  instance directly.
* We no longer send add/remove image commands to IQDB through AWS SQS,
  now we send them to IQDB directly. They are sent in a delayed job so
  that if IQDB is down, uploading images is still possible, the add
  image commands will just get queued up.
* Fix a bug where regenerating an image's thumbnails didn't regenerate
  IQDB, because IQDB silently ignored add image commands when the image
  already existed in the database.

app/controllers/iqdb_queries_controller.rb

@@ -5,7 +5,8 @@ class IqdbQueriesController < ApplicationController
     # XXX allow bare search params for backwards compatibility.
     search_params.merge!(params.slice(:url, :image_url, :file_url, :post_id, :limit, :similarity, :high_similarity).permit!)
 
-    @high_similarity_matches, @low_similarity_matches, @matches = IqdbProxy.new.search(search_params)
+    iqdb_params = search_params.to_h.symbolize_keys
+    @high_similarity_matches, @low_similarity_matches, @matches = IqdbClient.new.search(**iqdb_params)
     respond_with(@matches, template: "iqdb_queries/show")
   end
 

app/controllers/mock_services_controller.rb

@@ -31,7 +31,7 @@ class MockServicesController < ApplicationController
     render json: @data
   end
 
-  def iqdbs_similar
+  def iqdb_query
     @data = posts.map { |post| { post_id: post.id, score: rand(0..100)} }
     render json: @data
   end