#314

backend/app/services/video_sources/youtube/client.rb

@@ -0,0 +1,87 @@
+module VideoSources
+  module Youtube
+    class Client
+      API_BASE = 'https://www.googleapis.com/youtube/v3'
+
+      def initialize api_key: ENV.fetch('YOUTUBE_API_KEY')
+        @api_key = api_key
+      end
+
+      def videos video_ids
+        return [] if video_ids.empty?
+
+        response = connection.get('videos', part: 'snippet,statistics',
+                                            id: video_ids.join(','),
+                                            key: @api_key)
+
+        JSON.parse(response.body).fetch('items', []).map do |item|
+          build_video(item)
+        end
+      end
+
+      def comments video_id
+        comments = []
+        page_token = nil
+
+        loop do
+          response = connection.get('commentThreads', {
+              part: 'snippet',
+              videoId: video_id,
+              maxResults: 100,
+              textFormat: 'plainText',
+              pageToken: page_token,
+              key: @api_key }.compact)
+
+          body = JSON.parse(response.body)
+
+          comments.concat(body.fetch('items', []).map { |item| build_comment(item) })
+
+          page_token = body['nextPageToken']
+          break if page_token.blank?
+        end
+
+        comments
+      rescue Faraday::ForbiddenError
+        []
+      end
+
+      private
+
+      def connection
+        @connection ||= Faraday.new(url: API_BASE) do |faraday|
+          faraday.response :raise_error
+        end
+      end
+
+      def build_video item
+        snippet = item.fetch('snippet')
+        statistics = item.fetch('statistics', { })
+
+        { provider: 'youtube',
+          code: item.fetch('id'),
+          user_code: snippet['channelId'],
+          title: snippet['title'].to_s,
+          description: snippet['description'].to_s,
+          tag_names: snippet.fetch('tags', []),
+          views_count: statistics.fetch('viewCount', 0).to_i,
+          uploaded_at: Time.zone.parse(snippet.fetch('publishedAt')) }
+      end
+
+      def build_comment item
+        snippet =
+            item
+            .fetch('snippet')
+            .fetch('topLevelComment')
+            .fetch('snippet')
+
+        { provider_comment_id: item.fetch('id'),
+          user_code: snippet['authorChannelId']&.fetch('value', nil),
+          content: snippet['textDisplay'].to_s,
+          posted_at: Time.zone.parse(snippet.fetch('publishedAt')),
+          reaction_count: snippet.fetch('likeCount', 0).to_i,
+          comment_no: nil,
+          vpos_ms: nil }
+      end
+    end
+  end
+end