FIX: Use markdown for images and attachments in Email::Receiver.

lib/email/receiver.rb

@@ -1031,6 +1031,15 @@ module Email
             if attachment.content_type&.start_with?("image/")
               if raw[attachment.url]
                 raw.sub!(attachment.url, upload.url)
+
+                InlineUploads.match_img(raw) do |match, src, replacement, _|
+                  if src == upload.url
+                    raw = raw.sub(
+                      match,
+                      "![#{upload.original_filename}|#{upload.width}x#{upload.height}](#{upload.short_url})"
+                    )
+                  end
+                end
               elsif raw[/\[image:.*?\d+[^\]]*\]/i]
                 raw.sub!(/\[image:.*?\d+[^\]]*\]/i, attachment_markdown(upload))
               else
@@ -1074,9 +1083,9 @@ module Email
 
     def attachment_markdown(upload)
       if FileHelper.is_supported_image?(upload.original_filename)
-        "<img src='#{upload.url}' width='#{upload.width}' height='#{upload.height}'>"
+        "![#{upload.original_filename}|#{upload.width}x#{upload.height}](#{upload.short_url})"
       else
-        "<a class='attachment' href='#{upload.url}'>#{upload.original_filename}</a> (#{number_to_human_size(upload.filesize)})"
+        "[#{upload.original_filename}|attachment](#{upload.short_url}) (#{number_to_human_size(upload.filesize)})"
       end
     end
 

spec/components/email/receiver_spec.rb

@@ -553,38 +553,77 @@ describe Email::Receiver do
       SiteSetting.incoming_email_prefer_html = false
 
       expect { process(:no_body_with_image) }.to change { topic.posts.count }
-      expect(topic.posts.last.raw).to match(/<img/)
+
+      post = topic.posts.last
+      upload = post.uploads.first
+
+      expect(post.raw).to include(
+        "![#{upload.original_filename}|#{upload.width}x#{upload.height}](#{upload.short_url})"
+      )
 
       expect { process(:inline_image) }.to change { topic.posts.count }
-      expect(topic.posts.last.raw).to match(/Before\s+<img.+>\s+After/)
+
+      post = topic.posts.last
+      upload = post.uploads.first
+
+      expect(post.raw).to include(
+        "![#{upload.original_filename}|#{upload.width}x#{upload.height}](#{upload.short_url})"
+      )
     end
 
     it "supports attached images in HTML part" do
       SiteSetting.incoming_email_prefer_html = true
 
       expect { process(:inline_image) }.to change { topic.posts.count }
-      expect(topic.posts.last.raw).to match(/\*\*Before\*\*\s+<img.+>\s+\*After\*/)
+
+      post = topic.posts.last
+      upload = post.uploads.last
+
+      expect(post.raw).to eq(<<~MD.chomp)
+      **Before**
+
+      ![#{upload.original_filename}|#{upload.width}x#{upload.height}](#{upload.short_url})
+
+      *After*
+      MD
     end
 
     it "supports attachments" do
       SiteSetting.authorized_extensions = "txt|jpg"
       expect { process(:attached_txt_file) }.to change { topic.posts.count }
       post = topic.posts.last
-      expect(post.raw).to match(/\APlease find some text file attached\.\s+<a class='attachment' href='\/uploads\/default\/original\/.+?txt'>text\.txt<\/a> \(20 Bytes\)\z/)
+      upload = post.uploads.first
-      expect(post.uploads.size).to eq 1
+
+      expect(post.raw).to eq(<<~MD.chomp)
+      Please find some text file attached.
+
+      [#{upload.original_filename}|attachment](#{upload.short_url}) (20 Bytes)
+      MD
 
       expect { process(:apple_mail_attachment) }.to change { topic.posts.count }
       post = topic.posts.last
-      expect(post.raw).to match(/\APicture below\.\s+<img.+?src="\/uploads\/default\/original\/.+?jpeg" class="">\s+Picture above\.\z/)
+      upload = post.uploads.first
-      expect(post.uploads.size).to eq 1
+
+      expect(post.raw).to eq(<<~MD.chomp)
+      Picture below.
+
+      ![#{upload.original_filename}|#{upload.width}x#{upload.height}](#{upload.short_url})
+
+      Picture above.
+      MD
     end
 
     it "supports eml attachments" do
       SiteSetting.authorized_extensions = "eml"
       expect { process(:attached_eml_file) }.to change { topic.posts.count }
       post = topic.posts.last
-      expect(post.raw).to match(/\APlease find the eml file attached\.\s+<a class='attachment' href='\/uploads\/default\/original\/.+?eml'>sample\.eml<\/a> \(193 Bytes\)\z/)
+      upload = post.uploads.first
-      expect(post.uploads.size).to eq 1
+
+      expect(post.raw).to eq(<<~MD.chomp)
+      Please find the eml file attached.
+
+      [#{upload.original_filename}|attachment](#{upload.short_url}) (193 Bytes)
+      MD
     end
 
     context "when attachment is rejected" do
@@ -613,8 +652,11 @@ describe Email::Receiver do
       SiteSetting.authorized_extensions = "pdf"
       expect { process(:attached_pdf_file) }.to change { topic.posts.count }
       post = topic.posts.last
-      expect(post.raw).to match(/\A\s+<a class='attachment' href='\/uploads\/default\/original\/.+?pdf'>discourse\.pdf<\/a> \(64 KB\)\z/)
+      upload = post.uploads.last
-      expect(post.uploads.size).to eq 1
+
+      expect(post.raw).to include(
+        "[#{upload.original_filename}|attachment](#{upload.short_url}) (64 KB)"
+      )
     end
 
     it "supports liking via email" do
@@ -759,8 +801,13 @@ describe Email::Receiver do
     it "supports any kind of attachments when 'allow_all_attachments_for_group_messages' is enabled" do
       SiteSetting.allow_all_attachments_for_group_messages = true
       expect { process(:attached_rb_file) }.to change(Topic, :count)
-      expect(Post.last.raw).to match(/<a\sclass='attachment'[^>]*>discourse\.rb<\/a>/)
+
-      expect(Post.last.uploads.length).to eq 1
+      post = Topic.last.first_post
+      upload = post.uploads.first
+
+      expect(post.raw).to include(
+        "[#{upload.original_filename}|attachment](#{upload.short_url}) (#{upload.filesize} Bytes)"
+      )
     end
 
     it "reenables user's PM email notifications when user emails new topic to group" do