resize thumbnail pngs to save space

Gemfile

@@ -38,6 +38,7 @@ gem 'devise_token_auth'
 gem 'devise_invitable'
 gem 'omniauth'
 gem 'oj'  # fast json
+gem 'mini_magick'
 
 group :development, :test do
   # Call 'byebug' anywhere in the code to stop execution and get a debugger console

Gemfile.lock

@@ -168,6 +168,7 @@ GEM
     mime-types (3.1)
       mime-types-data (~> 3.2015)
     mime-types-data (3.2016.0521)
+    mini_magick (4.7.2)
     mini_portile2 (2.1.0)
     minitest (5.10.2)
     multi_json (1.12.1)
@@ -354,6 +355,7 @@ DEPENDENCIES
   httparty
   jbuilder (~> 2.0)
   jquery-rails
+  mini_magick
   oj
   omniauth
   rack-cors

app/services/data_view/create_data_view.rb

@@ -7,9 +7,23 @@ class CreateDataView
 
   def run(data_view_params, stream_ids, user, home_view=false)
 
+
+
     # normal data view
     @data_view = DataView.new(data_view_params.merge({owner: user}))
 
+    #resize thumbnail because client can upload any dimension
+    if(!@data_view.image.empty?)
+      metadata = "data:image/png;base64,"
+      base64_string = @data_view.image[metadata.size..-1]
+      blob = Base64.decode64(base64_string)
+      image = MiniMagick::Image.read(blob)
+      image.resize('200x100!')
+      image.format 'png'
+      scaled_image_bytes = image.to_blob
+      @data_view.image = metadata+Base64.strict_encode64(scaled_image_bytes)
+    end
+
     # build nilm associations for permissions
     begin
       #retrieve nilms for every stream in this view

app/services/db_stream/update_stream.rb

@@ -50,12 +50,17 @@ class UpdateStream
   # create or update DbDecimations for the
   # specified DbStream
   def __build_decimations(stream:, entry_group:)
+    if !entry_group.empty?
+      Rails.logger.warn("deleting decimations for #{stream.path}")
+      stream.db_decimations.destroy_all #remove existing decimations
+    end
     entry_group.each do |entry|
       level = entry[:path].match(UpdateStream.decimation_tag)[1].to_i
       decim = stream.db_decimations.find_by_level(level)
       decim ||= DbDecimation.new(db_stream: stream, level: level)
       decim.update_attributes(entry[:attributes])
-      decim.save!
+
+      #decim.save!
     end
   end
 
@@ -71,11 +76,11 @@ class UpdateStream
       # use the metadata if present
       unless element.update_attributes(entry[0] || {})
         element.use_default_attributes
+        element.save!
         Rails.logger.warn(stream_data)
         Rails.logger.warn("corrupt metadata: #{stream.path}:"\
                           "e#{element.column}")
       end
-      element.save!
     end
   end
 

config/initializers/filter_parameter_logging.rb

@@ -2,3 +2,6 @@
 
 # Configure sensitive parameters which will be filtered from the log file.
 Rails.application.config.filter_parameters += [:password]
+Rails.application.config.filter_parameters << lambda do |key, value|
+ value.replace('[BASE64 STRING OMITTED]') if key == 'redux_json' || key == 'image'
+end