Add discord support

config/locales/client.en.yml

@@ -63,10 +63,23 @@ en:
           param:
             name:
               title: "Name"
-              help: "A name to describe the channel. It is not used for the connection for telegram."
+              help: "A name to describe the channel. It is not used for the connection to Telegram."
             chat_id:
               title: Chat ID
               help: A number given to you by the bot, or a broadcast channel identifier in the form @channelname
             errors:
               channel_not_found: "The specified channel does not exist on Telegram"
-              forbidden: "The bot does not have permission to post to this channel"
+              forbidden: "The bot does not have permission to post to this channel"
+
+        #######################################
+        ########### DISCORD STRINGS ###########
+        #######################################
+        discord:
+          title: "Discord"
+          param:
+            name:
+              title: "Name"
+              help: "A name to describe the channel. It is not used for the connection to Discord."
+            webhook_url:
+              title: Webhook URL
+              help: The webhook URL created in your Discord server settings

config/locales/server.en.yml

@@ -25,6 +25,12 @@ en:
     chat_integration_telegram_access_token: "Your bot's access token from the Telegram botfather"
     chat_integration_telegram_excerpt_length: "Telegram post excerpt length"
     chat_integration_telegram_enable_slash_commands: "Allow telegram subscriptions to be managed using 'slash commands'"
+
+    #######################################
+    ########## DISCORD SETTINGS ###########
+    #######################################
+    chat_integration_discord_enabled: "Enable the Discord chat-integration provider"
+    chat_integration_discord_excerpt_length: "Discord post excerpt length"
   
   chat_integration:
     

config/settings.yml

@@ -37,4 +37,12 @@ plugins:
   chat_integration_telegram_enable_slash_commands:
     default: true
   chat_integration_telegram_secret:
-    hidden: true
+    hidden: true
+
+#######################################
+########## DISCORD SETTINGS ###########
+#######################################
+  chat_integration_discord_enabled:
+    default: false
+  chat_integration_discord_excerpt_length:
+    default: 400

lib/discourse_chat/provider.rb

@@ -90,4 +90,5 @@ module DiscourseChat
 end
 
 require_relative "provider/slack/slack_provider.rb"
-require_relative "provider/telegram/telegram_provider.rb"
+require_relative "provider/telegram/telegram_provider.rb"
+require_relative "provider/discord/discord_provider.rb"

lib/discourse_chat/provider/discord/discord_provider.rb

@@ -0,0 +1,65 @@
+module DiscourseChat
+  module Provider
+    module DiscordProvider
+      PROVIDER_NAME = "discord".freeze
+      PROVIDER_ENABLED_SETTING = :chat_integration_discord_enabled
+      CHANNEL_PARAMETERS = [
+                        {key: "name", regex: '^\S+'},
+                        {key: "webhook_url", regex: '^https:\/\/discordapp\.com\/api\/webhooks\/'}
+                       ]
+
+      def self.send_message(url, message)
+        http = Net::HTTP.new("discordapp.com", 443)
+        http.use_ssl = true
+
+        uri = URI(url)
+
+        req = Net::HTTP::Post.new(uri, 'Content-Type' =>'application/json')
+        req.body = message.to_json
+        response = http.request(req)
+
+        return response
+      end
+
+      def self.generate_discord_message(post)
+
+        display_name = "@#{post.user.username}"
+        full_name = post.user.name || ""
+
+        if !(full_name.strip.empty?) && (full_name.strip.gsub(' ', '_').casecmp(post.user.username) != 0) && (full_name.strip.gsub(' ', '').casecmp(post.user.username) != 0)
+          display_name = "#{full_name} @#{post.user.username}"
+        end
+
+        message = {
+          embeds:[{
+            title: post.topic.title,
+            description: post.excerpt(SiteSetting.chat_integration_discord_excerpt_length, text_entities: true, strip_links: true, remap_emoji: true),
+            url: post.full_url,
+            author:{
+              name: display_name,
+              url: Discourse.base_url+"/u/"+post.user.username,
+              icon_url: post.user.small_avatar_url
+            }
+          }]
+        }
+
+        return message
+      end
+
+      def self.trigger_notification(post, channel)
+        webhook_url = channel.data['webhook_url']+'?wait=true'
+
+        message = generate_discord_message(post)
+
+        response = send_message(webhook_url, message)
+
+        if not response.kind_of? Net::HTTPSuccess
+          error_key = nil
+          raise ::DiscourseChat::ProviderError.new info: {error_key: error_key, message: message, response_body:response.body}  
+        end
+
+      end
+
+    end
+  end
+end

spec/lib/discourse_chat/provider/discord/discord_provider_spec.rb

@@ -0,0 +1,28 @@
+require 'rails_helper'
+
+RSpec.describe DiscourseChat::Provider::DiscordProvider do
+  let(:post) { Fabricate(:post) }
+
+  describe '.trigger_notifications' do
+    before do
+      SiteSetting.chat_integration_discord_enabled = true
+    end
+
+    let(:chan1){DiscourseChat::Channel.create!(provider:'discord', data:{name: "Awesome Channel", webhook_url: 'https://discordapp.com/api/webhooks/1234/abcd'})}
+
+    it 'sends a webhook request' do
+      stub1 = stub_request(:post, 'https://discordapp.com/api/webhooks/1234/abcd?wait=true').to_return(status: 200)
+      described_class.trigger_notification(post, chan1)
+      expect(stub1).to have_been_requested.once
+    end
+
+    it 'handles errors correctly' do 
+      stub1 = stub_request(:post, "https://discordapp.com/api/webhooks/1234/abcd?wait=true").to_return(status: 400)
+      expect(stub1).to have_been_requested.times(0)
+      expect{described_class.trigger_notification(post, chan1)}.to raise_exception(::DiscourseChat::ProviderError)
+      expect(stub1).to have_been_requested.once
+    end
+
+  end
+
+end