入館申請のQRコードの送信先を選択できるように修正しました

app/models/admission_code_message.rb

@@ -12,11 +12,22 @@ def initialize(email)
   end
 
   def post
-    ChatMessageSender.new.post_public_message(api_post_body)
+    chat_message_sender = ChatMessageSender.new
+    res = chat_message_sender.post_public_message(api_post_body) if send_to_channel?
+    res = chat_message_sender.post_public_message(api_post_body_direct_message) if send_to_direct_message?
+    res
   end
 
   private
 
+  def send_to_channel?
+    %w[CHANNEL BOTH].include?(ENV.fetch("SEND_MODE"))
+  end
+
+  def send_to_direct_message?
+    %w[DM BOTH].include?(ENV.fetch("SEND_MODE"))
+  end
+
   # @return [Hash] postMessage API post body
   # @see https://api.slack.com/methods/chat.postMessage
   # @see https://github.com/slack-ruby/slack-ruby-client/blob/master/lib/slack/web/api/endpoints/chat.rb
@@ -31,6 +42,16 @@ def api_post_body
       ] }
   end
 
+  def api_post_body_direct_message
+    { icon_emoji: MESSAGES["notification"]["icon"],
+      channel: @email.slack_id,
+      text: "<@#{@email.slack_id}> #{MESSAGES['notification']['text_notification']}",
+      attachments: [
+        color: "good",
+        fields: attachment_fields
+      ] }
+  end
+
   # @return [Array] attachment_field array
   # @private
   def attachment_fields

app/models/chat_message_sender.rb

@@ -14,6 +14,10 @@ def post_public_message(post_body)
     @slack_api_client.chat_postMessage(post_body)
   end
 
+  def post_direct_message(post_body)
+    @slack_api_client.chat_postMessage(post_body)
+  end
+
   # 特定のユーザーだけに見える形で投稿
   # @param post_body [Hash]
   # @see https://api.slack.com/methods/chat.postEphemeral

sample.env

@@ -1,6 +1,6 @@
 # Slack App OAuth Access Token
 SLACK_TOKEN='xoxp-'
-# Slack への通知チャンネル (only public)
+# Slack への通知チャンネル
 SLACK_CHANNEL='#reception'
 # srd-gate.com の認証ユーザー
 SRD_GATE_USERNAME=""
@@ -11,4 +11,6 @@ MAIL_ADDRESS_HOST=""
 # 申請結果を受け取る Email Webhook 用のアドレス（ゲストに届くメール）
 MAIL_ADDRESS_WEBHOOK=""
 # 会社の電話番号（申請に必要）
-COMPANY_TEL="03-1234-5678"
+COMPANY_TEL="03-1234-5678"
+# 通知の送信先（CHANNEL or DM or BOTH）
+SEND_MODE=""

spec/app/models/admission_code_message_spec.rb

@@ -3,6 +3,7 @@
 require "spec_helper"
 require_relative "../../../app/models/email"
 require_relative "../../../app/models/admission_code_message"
+require_relative "../../../app/models/chat_message_sender"
 
 describe AdmissionCodeMessage do
   let(:instance) { described_class.new(email) }
@@ -30,6 +31,50 @@
     EMAIL_BODY
   end
 
+  describe "#post" do
+    context "SEND_MODE が CHANNEL の場合" do
+      it "post_public_message が1回呼ばれること" do
+        allow(ENV).to receive(:fetch).with("SEND_MODE").and_return("CHANNEL")
+        allow(ENV).to receive(:fetch).with("SLACK_CHANNEL").and_return("CH15TJXEX")
+        chat_message_sender = instance_double(ChatMessageSender)
+        allow(ChatMessageSender).to receive(:new).and_return(chat_message_sender)
+        allow(chat_message_sender).to receive(:post_public_message)
+
+        instance.post
+
+        expect(chat_message_sender).to have_received(:post_public_message).once
+      end
+    end
+
+    context "SEND_MODE が DM の場合" do
+      it "post_direct_message が1回呼ばれること" do
+        allow(ENV).to receive(:fetch).with("SEND_MODE").and_return("DM")
+        allow(ENV).to receive(:fetch).with("SLACK_CHANNEL").and_return("CH15TJXEX")
+        chat_message_sender = instance_double(ChatMessageSender)
+        allow(ChatMessageSender).to receive(:new).and_return(chat_message_sender)
+        allow(chat_message_sender).to receive(:post_public_message)
+
+        instance.post
+
+        expect(chat_message_sender).to have_received(:post_public_message).once
+      end
+    end
+
+    context "SEND_MODE が BOTH の場合" do
+      it "post_public_message が2回呼ばれること" do
+        allow(ENV).to receive(:fetch).with("SEND_MODE").and_return("BOTH")
+        allow(ENV).to receive(:fetch).with("SLACK_CHANNEL").and_return("CH15TJXEX")
+        chat_message_sender = instance_double(ChatMessageSender)
+        allow(ChatMessageSender).to receive(:new).and_return(chat_message_sender)
+        allow(chat_message_sender).to receive(:post_public_message)
+
+        instance.post
+
+        expect(chat_message_sender).to have_received(:post_public_message).twice
+      end
+    end
+  end
+
   describe "#api_post_body" do
     before do
       allow(ENV).to receive(:fetch).with("SLACK_CHANNEL").and_return("CH15TJXEX")