Download and attach icons for web apps

app/models/app_catalog/web_app.rb

@@ -1,9 +1,20 @@
 class AppCatalog::WebApp < ApplicationRecord
-
   store :metadata, coder: JSON
 
+  has_one_attached :icon do |attachable|
+    attachable.variant :medium, resize_to_limit: [128,128]
+    attachable.variant :large,  resize_to_limit: [256,256]
+  end
+
+  has_one_attached :apple_touch_icon
+
   validates :url, presence: true, uniqueness: true
   validates :url, format: { with: URI.regexp },
                   if: Proc.new { |a| a.url.present? }
 
+  # before_create :update_metadata
+
+  def update_metadata
+    AppCatalogManager::UpdateMetadata.call(self)
+  end
 end

app/services/app_catalog_manager/fetch_metadata.rb

@@ -1,26 +0,0 @@
-require 'manifique'
-
-module AppCatalogManager
-  class FetchMetadata < AppCatalogManagerService
-    def initialize(app)
-      @app = app
-    end
-
-    def call
-      agent = Manifique::Agent.new(url: @app.url)
-      metadata = agent.fetch_metadata
-
-      @app.name = metadata.name
-
-      [:name, :short_name, :description, :theme_color, :background_color,
-       :display, :start_url, :scope, :share_target].each do |prop|
-        @app.metadata[prop] = metadata.send(prop) if prop
-      end
-    rescue Manifique::Error => e
-      msg = "Fetching web app manifest failed for #{e.url}: #{e.type}"
-      Rails.logger.warn(msg)
-      Sentry.capture_message(msg) if Setting.sentry_enabled?
-      false
-    end
-  end
-end

app/services/app_catalog_manager/update_metadata.rb

@@ -0,0 +1,44 @@
+require "manifique"
+require "down"
+
+module AppCatalogManager
+  class UpdateMetadata < AppCatalogManagerService
+    def initialize(app)
+      @app = app
+    end
+
+    def call
+      agent = Manifique::Agent.new(url: @app.url)
+      metadata = agent.fetch_metadata
+
+      @app.name = metadata.name
+
+      [:name, :short_name, :description, :theme_color, :background_color,
+       :display, :start_url, :scope, :share_target, :icons].each do |prop|
+        @app.metadata[prop] = metadata.send(prop) if prop
+      end
+
+      if icon = metadata.select_icon(sizes: "256x256")
+        attach_remote_image(:icon, icon)
+      end
+      if apple_touch_icon = metadata.select_icon(purpose: "apple-touch-icon")
+        attach_remote_image(:apple_touch_icon, apple_touch_icon)
+      end
+
+      byebug
+    rescue Manifique::Error => e
+      msg = "Fetching web app manifest failed for #{e.url}: #{e.type}"
+      Rails.logger.warn(msg)
+      Sentry.capture_message(msg) if Setting.sentry_enabled?
+      false
+    end
+
+    def attach_remote_image(attachment_name, icon)
+      download_url = "#{@app.url}/#{icon["src"].gsub(/^\//,'')}"
+      filename = "web_apps/#{@app.id}/icons/#{attachment_name}.png"
+
+      tempfile = Down.download(download_url)
+      @app.send(attachment_name).attach(io: tempfile, filename: filename)
+    end
+  end
+end