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feat: parse inline attachments for incoming mail (#7136)
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Browse source 
- Some email clients send inline attachments using the `multipart/related` Mime-Type and enmime collects these in the `Envelope.OtherParts` list; until now only Envelope.Attachments and Envelope.Inline were considered while parsing incoming mail.
- As some email clients send attachments without filename, especially in the multipart/related case, this PR implements `constructFilename`, which guesses the filename based on the ContentType.

How the issue was disovered:
I implemented an otherwise unrelated application written in go that parses emails with enmime just like Forgejo does.
I noticed that in a few occasions that system would fail to detect all attachments.
Investigating this issue led me to realize the above described issue.
After implementing a fix for that application, I looked through the Forgejo email parsing code and discovered the same problem.

Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/7136
Reviewed-by: Gusted <gusted@noreply.codeberg.org>
Co-authored-by: christopher-besch <mail@chris-besch.com>
Co-committed-by: christopher-besch <mail@chris-besch.com>
This commit is contained in:
christopher-besch 2025-03-07 17:54:26 +00:00 • committed by Gusted
parent b2d01fdde6
commit 3de904c963
2 changed files with 224 additions and 3 deletions
Download patch file Download diff file Expand all files Collapse all files

188
services/mailer/incoming/incoming_test.go
View file

@ -4,6 +4,7 @@
package incoming
import (
"encoding/base64"
"strings"
"testing"
@ -194,4 +195,191 @@ func TestGetContentFromMailReader(t *testing.T) {
require.NoError(t, err)
assert.Equal(t, "mail content without signature", content.Content)
assert.Empty(t, content.Attachments)
// Some versions of Outlook send inline attachments like this, inside a multipart/related part.
// the attached image is from: https://openmoji.org/library/emoji-1F684
mailString = "Content-Type: multipart/related; boundary=\"=_related boundary=\"\r\n" +
"\r\n" +
"This text is for clients unable to decode multipart/related with multipart/alternative.\r\n" +
"\r\n" +
"--=_related boundary=\r\n" +
"Content-Type: multipart/alternative; boundary=\"=_alternative boundary=\"\r\n" +
"\r\n" +
"\r\n" +
"\r\n" +
"--=_alternative boundary=\r\n" +
"Content-Type: text/plain\r\n" +
"\r\n" +
"This is the plaintext.\r\n" +
"\r\n" +
"--=_alternative boundary=\r\n" +
"Content-Type: text/html\r\n" +
"\r\n" +
"<p>This is a mail with multipart/related. Here is an image sent with a filename.</p>\r\n" +
"<img src=cid:_1_2845>\r\n" +
"\r\n" +
"--=_alternative boundary=--\r\n" +
"\r\n" +
"--=_related boundary=\r\n" +
"Content-Transfer-Encoding: base64\r\n" +
"Content-Type: image/png;\r\n" +
" name=\"image001.png\"\r\n" +
"Content-ID: <_1_2845>\r\n" +
"\r\n" +
"iVBORw0KGgoAAAANSUhEUgAAAEAAAAAiCAYAAADvVd+PAAAFLUlEQVRo3t2ZX0iTXxjHP3u35qvT\r\n" +
"6ZzhzKFuzPQq9WKQZS6FvLQf3Wh30ViBQXnViC5+LVKEiC6DjMQgCCy6NChoIKwghhcR1bJ5s5Ei\r\n" +
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"+fbtW87WbW1tRbVdmxZC8PTpU8bGxrh//z5fv37dcJxGo2HXrl1ZWVOhUPzybDAYUOSbAYlEgjt3\r\n" +
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"/r3YLuTlAD5+/ChOnDiR3HhdXZ24e/euiMfjYruRcxe4evUqV65c4fPnz6hUKrq7uzl06NA6v157\r\n" +
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"AUCWZXbv3g1AIBBYR/NoNEokEuHLly8kEgkATCYTQ0NDHD9+fFOGrKW2jfRmGxqNJr1CaHJyUuj1\r\n" +
"+j8qNiRJEp2dneL27dtidXU15TrhcFhYLJa/Km4ykeLi4tSF0O++Xl9fz5EjR9Dr9SlPtry8nKqq\r\n" +
"KsxmM1arFa1Wm7ZVQqEQDx8+5N27dznvTG022+YMmJycFEajUQBClmUxMjIiYrGYKDSwVQ3f3t4u\r\n" +
"3rx5k1LJy5cvhd1uF83NzaKoqChvFP5b6e3t/fUAMrX64uKiOHnypFAoFDtm0z9Ll14nVACRSIQz\r\n" +
"Z84wPj4OwMGDBxkbG6OxsXFT/7l37x6Dg4PMz89TJEn0VVXwT2U5dUVq1DlOXdmCsrwcVTQapaen\r\n" +
"B4/HgyzLDA8Pc+7cOSRJ2nTixYsXGR4eBsBaWsK/xmrqitTsSIyOjgpAmEwm8fbt27QCx969e3ck\r\n" +
"5TdyAfr6+gQgxsfH046ct27dEjqdbscfQG9vr1CtNRiZVMR2ux273U4hQOru7gbA5XLh9Xr5H/wn\r\n" +
"yS9WV1dFR0dHQfh0ptLR0fGjDgiHw8LpdIqGhoYdm9P/RCwWS3qXok+ePOHs2bO8fv06eZ3c39+X\r\n" +
"7AZ3MlK2wzMzMwwMDPD48WMAamtr6e/vo7m5uWBCwKYMWFhYoK2tjWAwiEaj4ejRXmw2W8oCqaAO\r\n" +
"wO1209XVhSzLHD5s+3F5UGAwGo2bt8OhUEjU1NQUdBDc8s9QMBhkYmIieVVVaLDZbHwHmmIQk3rD\r\n" +
"exgAAAAASUVORK5CYII=\r\n" +
"\r\n" +
"--=_related boundary=--\r\n" +
"\r\n"
env, err = enmime.ReadEnvelope(strings.NewReader(mailString))
require.NoError(t, err)
content = getContentFromMailReader(env)
assert.Equal(t, "This is the plaintext.", content.Content)
assert.Len(t, content.Attachments, 1)
assert.Equal(t, "image001.png", content.Attachments[0].Name)
expectedAttachment, err := base64.StdEncoding.DecodeString(
"iVBORw0KGgoAAAANSUhEUgAAAEAAAAAiCAYAAADvVd+PAAAFLUlEQVRo3t2ZX0iTXxjHP3u35qvT\r\n" +
"6ZzhzKFuzPQq9WKQZS6FvLQf3Wh30ViBQXnViC5+LVKEiC6DjMQgCCy6NChoIKwghhcR1bJ5s5Ei\r\n" +
"LmtNs/05XYT7Vercaps/94Xn4uU95znvOc/3+XdehRBCsM1YXl7G6/Xi8Xh49uwZMzMzhEIhFhcX\r\n" +
"+fbtW87WbW1tRbVdmxZC8PTpU8bGxrh//z5fv37dcJxGo2HXrl1ZWVOhUPzybDAYUOSbAYlEgjt3\r\n" +
"7nD58mVmZ2cBkCSJ1tZWDhw4wP79+2lpaUGv16PX61Gr1Tm3RN7w/Plz0d7eLgABCKPRKJxOp3j/\r\n" +
"/r3YLuTlAD5+/ChOnDiR3HhdXZ24e/euiMfjYruRcxe4evUqV65c4fPnz6hUKrq7uzl06NA6v157\r\n" +
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"+j8qNiRJEp2dneL27dtidXU15TrhcFhYLJa/Km4ykeLi4tSF0O++Xl9fz5EjR9Dr9SlPtry8nKqq\r\n" +
"KsxmM1arFa1Wm7ZVQqEQDx8+5N27dznvTG022+YMmJycFEajUQBClmUxMjIiYrGYKDSwVQ3f3t4u\r\n" +
"3rx5k1LJy5cvhd1uF83NzaKoqChvFP5b6e3t/fUAMrX64uKiOHnypFAoFDtm0z9Ll14nVACRSIQz\r\n" +
"Z84wPj4OwMGDBxkbG6OxsXFT/7l37x6Dg4PMz89TJEn0VVXwT2U5dUVq1DlOXdmCsrwcVTQapaen\r\n" +
"B4/HgyzLDA8Pc+7cOSRJ2nTixYsXGR4eBsBaWsK/xmrqitTsSIyOjgpAmEwm8fbt27QCx969e3ck\r\n" +
"5TdyAfr6+gQgxsfH046ct27dEjqdbscfQG9vr1CtNRiZVMR2ux273U4hQOru7gbA5XLh9Xr5H/wn\r\n" +
"yS9WV1dFR0dHQfh0ptLR0fGjDgiHw8LpdIqGhoYdm9P/RCwWS3qXok+ePOHs2bO8fv06eZ3c39+X\r\n" +
"7AZ3MlK2wzMzMwwMDPD48WMAamtr6e/vo7m5uWBCwKYMWFhYoK2tjWAwiEaj4ejRXmw2W8oCqaAO\r\n" +
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"exgAAAAASUVORK5CYII=\r\n")
require.NoError(t, err)
assert.Equal(t, expectedAttachment, content.Attachments[0].Content)
// HCL Notes inlines attachments like this: without a filename.
// the attached image is from: https://openmoji.org/library/emoji-1F684
mailString = "Content-Type: multipart/related; boundary=\"=_related boundary=\"\r\n" +
"\r\n" +
"This text is for clients unable to decode multipart/related with multipart/alternative.\r\n" +
"\r\n" +
"--=_related boundary=\r\n" +
"Content-Type: multipart/alternative; boundary=\"=_alternative boundary=\"\r\n" +
"\r\n" +
"\r\n" +
"\r\n" +
"--=_alternative boundary=\r\n" +
"Content-Type: text/plain\r\n" +
"\r\n" +
"This is the plaintext.\r\n" +
"\r\n" +
"--=_alternative boundary=\r\n" +
"Content-Type: text/html\r\n" +
"\r\n" +
"<p>This is a mail with multipart/related. Here is an image sent without a filename.</p>\r\n" +
"<img src=cid:_1_2845>\r\n" +
"\r\n" +
"--=_alternative boundary=--\r\n" +
"\r\n" +
"--=_related boundary=\r\n" +
"Content-Transfer-Encoding: base64\r\n" +
"Content-Type: image/png\r\n" +
"Content-ID: <_1_2845>\r\n" +
"\r\n" +
"iVBORw0KGgoAAAANSUhEUgAAAEAAAAAiCAYAAADvVd+PAAAFLUlEQVRo3t2ZX0iTXxjHP3u35qvT\r\n" +
"6ZzhzKFuzPQq9WKQZS6FvLQf3Wh30ViBQXnViC5+LVKEiC6DjMQgCCy6NChoIKwghhcR1bJ5s5Ei\r\n" +
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"exgAAAAASUVORK5CYII=\r\n" +
"\r\n" +
"--=_related boundary=--\r\n" +
"\r\n"
env, err = enmime.ReadEnvelope(strings.NewReader(mailString))
require.NoError(t, err)
content = getContentFromMailReader(env)
assert.Equal(t, "This is the plaintext.", content.Content)
assert.Len(t, content.Attachments, 1)
assert.Equal(t, "_1_2845.png", content.Attachments[0].Name)
expectedAttachment, err = base64.StdEncoding.DecodeString(
"iVBORw0KGgoAAAANSUhEUgAAAEAAAAAiCAYAAADvVd+PAAAFLUlEQVRo3t2ZX0iTXxjHP3u35qvT\r\n" +
"6ZzhzKFuzPQq9WKQZS6FvLQf3Wh30ViBQXnViC5+LVKEiC6DjMQgCCy6NChoIKwghhcR1bJ5s5Ei\r\n" +
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"B4/HgyzLDA8Pc+7cOSRJ2nTixYsXGR4eBsBaWsK/xmrqitTsSIyOjgpAmEwm8fbt27QCx969e3ck\r\n" +
"5TdyAfr6+gQgxsfH046ct27dEjqdbscfQG9vr1CtNRiZVMR2ux273U4hQOru7gbA5XLh9Xr5H/wn\r\n" +
"yS9WV1dFR0dHQfh0ptLR0fGjDgiHw8LpdIqGhoYdm9P/RCwWS3qXok+ePOHs2bO8fv06eZ3c39+X\r\n" +
"7AZ3MlK2wzMzMwwMDPD48WMAamtr6e/vo7m5uWBCwKYMWFhYoK2tjWAwiEaj4ejRXmw2W8oCqaAO\r\n" +
"wO1209XVhSzLHD5s+3F5UGAwGo2bt8OhUEjU1NQUdBDc8s9QMBhkYmIieVVVaLDZbHwHmmIQk3rD\r\n" +
"exgAAAAASUVORK5CYII=\r\n")
require.NoError(t, err)
assert.Equal(t, expectedAttachment, content.Attachments[0].Content)
}