api: added super simple motd, closes #7866

1 files changed, 105 insertions, 7 deletions

diff --git a/app/controllers/v1/messages_controller.rb b/app/controllers/v1/messages_controller.rb
index a496378..c0ca0c7 100644
--- a/app/controllers/v1/messages_controller.rb
+++ b/app/controllers/v1/messages_controller.rb
@@ -4,17 +4,115 @@ module V1
     before_filter :require_login
 
     def index
-      render json: current_user.messages
+      if Dir.exist?(motd_dir)
+        if !CommonLanguages::available_code?(params[:locale])
+          locale = 'en'
+        else
+          locale = params[:locale]
+        end
+        render json: motd_files_for_locale(locale)
+      else
+        render json: []
+      end
+    end
+
+    # disable per-user messages for now, not supported in the client
+    #def update
+    #  if message = Message.find(params[:id])
+    #    message.mark_as_read_by(current_user)
+    #    message.save
+    #    render json: success(:marked_as_read)
+    #  else
+    #    render json: error(:not_found), status: :not_found
+    #  end
+    #end
+
+    private
+
+    #
+    # returns list of messages, for example:
+    #
+    # [
+    #   {"id": 1, "locale": "en", "text": "<message text>"},
+    #   {"id": 2, "locale": "en", "text": "<message text>"}
+    # ]
+    #
+    # Each message is present only once, using the best choice
+    # for the locale. The order is determined by the id.
+    #
+    def motd_files_for_locale(locale)
+      files = []
+      motd_files.keys.each do |id|
+        if motd_files[id].key?(locale)
+          msg_locale = locale
+        elsif motd_files[id].key?('en')
+          msg_locale = 'en'
+        else
+          msg_locale = motd_files[id].keys.first
+        end
+        files << {
+          "id" => id,
+          "locale" => msg_locale,
+          "text" => motd_files[id][msg_locale]
+        }
+      end
+      files.sort! {|a,b| a["id"].to_i <=> b["id"].to_i }
+      return files
+    end
+
+    #
+    # returns messages of the day as a hash:
+    # { "1": {"en": "message"}, "2": {"en": "message"} }
+    #
+    def motd_files
+      if motd_changed? || @motd_files.nil?
+        @motd_files = load_motd_files
+      else
+        @motd_files
+      end
     end
 
-    def update
-      if message = Message.find(params[:id])
-        message.mark_as_read_by(current_user)
-        message.save
-        render json: success(:marked_as_read)
+    def motd_changed?
+      newest = Dir.glob(File.join(motd_dir, '*.{html,md}')).collect{|file| File.mtime(file)}.max
+      if @timestamp.nil?
+        @timestamp = newest
+        return true
+      elsif @timestamp < newest
+        @timestamp = newest
+        return true
       else
-        render json: error(:not_found), status: :not_found
+        return false
+      end
+    end
+
+    def load_motd_files
+      files = {}
+      Dir.glob(File.join(motd_dir, '*.{html,md}')).each do |file|
+        id, locale, msg = parse_motd_file(file)
+        next unless id
+        files[id] ||= {}
+        files[id][locale] = msg
+      end
+      files
+    end
+
+    def parse_motd_file(file)
+      id, locale, ext = File.basename(file).split('.')
+      if id.nil? || locale.nil? || ext.nil? || id.to_i.to_s != id || !['md', 'html'].include?(ext)
+        Rails.logger.error "ERROR: Could not parse MOTD file #{file}"
+        return nil
+      end
+      contents = File.read(file)
+      if ext == "md"
+        msg = RDiscount.new(contents, :autolink).to_html
+      elsif ext == "html"
+        msg = File.read(file)
       end
+      return id, locale, msg
+    end
+
+    def motd_dir
+      File.join(APP_CONFIG['customization_directory'], 'motd')
     end
 
   end