DEV: Remove old TODOs for message-id formats (#27196)

Introduced back in 2022 in
e3d495850d,
our new more specific message-id format for inbound and
outbound emails has now been in use for a very long time,
we can remove the support for the old formats:

`topic/:topic_id/:post_id.:random@:host`
`topic/:topic_id@:host`
`topic/:topic_id.:random@:host`

lib/email/message_id_service.rb

@@ -71,29 +71,13 @@ module Email
       def find_post_from_message_ids(message_ids)
         message_ids = message_ids.map { |message_id| message_id_clean(message_id) }
 
-        # TODO (martin) 2023-04-01 We should remove these backwards-compatible
-        # formats for the Message-ID and solely use the discourse/post/999@host
-        # format.
-        topic_ids =
-          message_ids
-            .map { |message_id| message_id[message_id_topic_id_regexp, 1] }
-            .compact
-            .map(&:to_i)
         post_ids =
           message_ids
-            .map { |message_id| message_id[message_id_post_id_regexp, 1] }
-            .compact
-            .map(&:to_i)
-
-        post_ids << message_ids
             .map { |message_id| message_id[message_id_discourse_regexp, 1] }
             .compact
             .map(&:to_i)
 
-        post_ids << Post
+        post_ids << Post.where(outbound_message_id: message_ids).pluck(:id)
-          .where(outbound_message_id: message_ids)
-          .or(Post.where(topic_id: topic_ids, post_number: 1))
-          .pluck(:id)
         post_ids << EmailLog.where(message_id: message_ids).pluck(:post_id)
         post_ids << IncomingEmail.where(message_id: message_ids).pluck(:post_id)
 
@@ -106,24 +90,8 @@ module Email
         Post.where(id: post_ids).order(:created_at).last
       end
 
-      # TODO (martin) 2023-04-01 We should remove these backwards-compatible
-      # formats for the Message-ID and solely use the discourse/post/999@host
-      # format.
       def discourse_generated_message_id?(message_id)
-        !!(message_id =~ message_id_post_id_regexp) ||
+        message_id_discourse_regexp.match?(message_id)
-          !!(message_id =~ message_id_topic_id_regexp) ||
-          !!(message_id =~ message_id_discourse_regexp)
-      end
-
-      # TODO (martin) 2023-04-01 We should remove these backwards-compatible
-      # formats for the Message-ID and solely use the discourse/post/999@host
-      # format.
-      def message_id_post_id_regexp
-        Regexp.new "topic/\\d+/(\\d+|\\d+\.\\w+)@#{Regexp.escape(host)}"
-      end
-
-      def message_id_topic_id_regexp
-        Regexp.new "topic/(\\d+|\\d+\.\\w+)@#{Regexp.escape(host)}"
       end
 
       def message_id_discourse_regexp

spec/fixtures/emails/old_destination.eml

@@ -4,7 +4,7 @@ To: reply+4f97315cc828096c9cb34c6f1a0d6fe8@bar.com
 Cc: foofoo@bar.com
 Date: Fri, 15 Jan 2018 00:12:43 +0100
 Message-ID: <999@foo.bar.mail>
-In-Reply-To: <topic/424242/123456@test.localhost>
+In-Reply-To: <discourse/post/:post_id@test.localhost>
 Mime-Version: 1.0
 Content-Type: text/plain
 Content-Transfer-Encoding: 7bit

spec/lib/email/processor_spec.rb

@@ -180,10 +180,7 @@ RSpec.describe Email::Processor do
     fab!(:topic)
     fab!(:post) { Fabricate(:post, topic: topic, created_at: 3.days.ago) }
     let(:mail) do
-      file_from_fixtures("old_destination.eml", "emails")
+      file_from_fixtures("old_destination.eml", "emails").read.gsub(":post_id", post.id.to_s)
-        .read
-        .gsub("424242", topic.id.to_s)
-        .gsub("123456", post.id.to_s)
     end
 
     it "rejects the email with the right response" do

spec/lib/email/receiver_spec.rb

@@ -93,7 +93,7 @@ RSpec.describe Email::Receiver do
     post = Fabricate(:post, topic: topic)
     user = Fabricate(:user, email: "discourse@bar.com")
 
-    mail = email(:old_destination).gsub("424242", topic.id.to_s)
+    mail = email(:old_destination).gsub(":post_id", post.id.to_s)
     expect { Email::Receiver.new(mail).process! }.to raise_error(
       Email::Receiver::BadDestinationAddress,
     )
@@ -1120,44 +1120,6 @@ RSpec.describe Email::Receiver do
           Email::Receiver.new(mail_string).process!
         end
 
-        it "posts a reply using a message-id in the format topic/TOPIC_ID/POST_ID@HOST" do
-          expect {
-            process_mail_with_message_id("topic/#{topic.id}/#{post.id}@test.localhost")
-          }.to change { Post.count }.by(1)
-          expect(topic.reload.posts.last.raw).to include(
-            "This is email reply testing with Message-ID formats",
-          )
-        end
-
-        it "posts a reply using a message-id in the format topic/TOPIC_ID@HOST" do
-          expect { process_mail_with_message_id("topic/#{topic.id}@test.localhost") }.to change {
-            Post.count
-          }.by(1)
-          expect(topic.reload.posts.last.raw).to include(
-            "This is email reply testing with Message-ID formats",
-          )
-        end
-
-        it "posts a reply using a message-id in the format topic/TOPIC_ID/POST_ID.RANDOM_SUFFIX@HOST" do
-          expect {
-            process_mail_with_message_id("topic/#{topic.id}/#{post.id}.rjc3yr79834y@test.localhost")
-          }.to change { Post.count }.by(1)
-          expect(topic.reload.posts.last.raw).to include(
-            "This is email reply testing with Message-ID formats",
-          )
-        end
-
-        it "posts a reply using a message-id in the format topic/TOPIC_ID.RANDOM_SUFFIX@HOST" do
-          expect {
-            process_mail_with_message_id(
-              "topic/#{topic.id}/#{post.id}.x3487nxy877843x@test.localhost",
-            )
-          }.to change { Post.count }.by(1)
-          expect(topic.reload.posts.last.raw).to include(
-            "This is email reply testing with Message-ID formats",
-          )
-        end
-
         it "posts a reply using a message-id in the format discourse/post/POST_ID@HOST" do
           expect {
             process_mail_with_message_id("discourse/post/#{post.id}@test.localhost")

spec/lib/imap/sync_spec.rb

@@ -142,7 +142,7 @@ RSpec.describe Imap::Sync do
     end
 
     context "when the message id matches the receiver post id regex" do
-      let(:message_id) { "topic/999/324@test.localhost" }
+      let(:message_id) { "discourse/post/324@test.localhost" }
       it "does not duplicate incoming email" do
         incoming_email = Fabricate(:incoming_email, message_id: message_id)
 

spec/lib/message_id_service_spec.rb

@@ -52,22 +52,11 @@ RSpec.describe Email::MessageIdService do
   end
 
   describe "find_post_from_message_ids" do
-    let(:post_format_message_id) { "<topic/#{topic.id}/#{post.id}.test123@test.localhost>" }
-    let(:topic_format_message_id) { "<topic/#{topic.id}.test123@test.localhost>" }
     let(:discourse_format_message_id) { "<discourse/post/#{post.id}@test.localhost>" }
     let(:default_format_message_id) { "<36ac1ddd-5083-461d-b72c-6372fb0e7f33@test.localhost>" }
     let(:gmail_format_message_id) do
       "<CAPGrNgZ7QEFuPcsxJBRZLhBhAYPO_ruYpCANSdqiQEbc9Otpiw@mail.gmail.com>"
     end
-
-    it "finds a post based only on a post-format message id" do
-      expect(described_class.find_post_from_message_ids([post_format_message_id])).to eq(post)
-    end
-
-    it "finds a post based only on a topic-format message id" do
-      expect(described_class.find_post_from_message_ids([topic_format_message_id])).to eq(post)
-    end
-
     it "finds a post based only on a discourse-format message id" do
       expect(described_class.find_post_from_message_ids([discourse_format_message_id])).to eq(post)
     end
@@ -101,16 +90,6 @@ RSpec.describe Email::MessageIdService do
         incoming_email.post,
       )
     end
-
-    it "gets the last created post if multiple are returned" do
-      incoming_email =
-        Fabricate(
-          :incoming_email,
-          message_id: described_class.message_id_clean(post_format_message_id),
-          post: Fabricate(:post, created_at: 10.days.ago),
-        )
-      expect(described_class.find_post_from_message_ids([post_format_message_id])).to eq(post)
-    end
   end
 
   describe "#discourse_generated_message_id?" do
@@ -119,14 +98,6 @@ RSpec.describe Email::MessageIdService do
     end
 
     it "works correctly for the different possible formats" do
-      expect(check_format("topic/1223/4525.3c4f8n9@test.localhost")).to eq(true)
-      expect(check_format("<topic/1223/4525.3c4f8n9@test.localhost>")).to eq(true)
-      expect(check_format("topic/1223.fc3j4843@test.localhost")).to eq(true)
-      expect(check_format("<topic/1223.fc3j4843@test.localhost>")).to eq(true)
-      expect(check_format("topic/1223/4525@test.localhost")).to eq(true)
-      expect(check_format("<topic/1223/4525@test.localhost>")).to eq(true)
-      expect(check_format("topic/1223@test.localhost")).to eq(true)
-      expect(check_format("<topic/1223@test.localhost>")).to eq(true)
       expect(check_format("discourse/post/1223@test.localhost")).to eq(true)
       expect(check_format("<discourse/post/1223@test.localhost>")).to eq(true)