Fix querying iqdb by image id

app/logical/iqdb.rb

@@ -54,18 +54,24 @@ module Iqdb
   end
 
   def query_file(file, score_cutoff)
-    thumb = generate_thumbnail(file.path)
+    Tempfile.open("yiffy2-#{file.md5}") do |tempfile|
-    return [] unless thumb
+      file.binmode
+      tempfile.binmode
+      tempfile.write(file.read)
+      tempfile.rewind
+      thumb = generate_thumbnail(tempfile.path)
+      raise(Error, "failed to generate thumb for #{file.md5}") unless thumb
 
       response = make_request("/query", :post, get_channels_data(thumb))
-    return [] if response.status != 200
+      raise(Error, "iqdb request failed") if response.status != 200
 
       process_iqdb_result(JSON.parse(response.body), score_cutoff)
     end
+  end
 
   def query_hash(hash, score_cutoff)
     response = make_request("/query", :post, { hash: hash })
-    return [] if response.status != 200
+    raise(Error, "iqdb request failed") if response.status != 200
 
     process_iqdb_result(JSON.parse(response.body), score_cutoff)
   end
@@ -73,7 +79,7 @@ module Iqdb
   def process_iqdb_result(json, score_cutoff)
     raise(Error, "Server returned an error. Most likely the url is not found.") unless json.is_a?(Array)
 
-    json.filter! { |entry| (entry["score"] || 0) >= (score_cutoff.presence || 60).to_i }
+    json.filter! { |entry| (entry["score"] || 0) >= (score_cutoff.presence || 50).to_i }
     json.map do |x|
       x["image"] = APIImage.find_by!(iqdb_id: x["post_id"])
       x