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parse: fix content-type parsing error

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If an error occurs when parsing the content-type, check if the
content-type is quoted; if so, remove quotes. If this is not the case,
then return a text/plain content-type as a sane fallback option, so that
the message can be at least viewed in plaintext.

Fixes: https://todo.sr.ht/~rjarry/aerc/44
Signed-off-by: Koni Marti <koni.marti@gmail.com>
Acked-by: Robin Jarry <robin@jarry.cc>
This commit is contained in:
Koni Marti 2022-06-02 14:43:34 +02:00 committed by Robin Jarry
parent 8b6f9719a8
commit 955f7683af
3 changed files with 96 additions and 1 deletions
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27
worker/lib/parse.go
View file

@ -64,12 +64,37 @@ func splitMIME(m string) (string, string) {
return parts[0], parts[1]
}
func fixContentType(h message.Header) (string, map[string]string) {
ct, rest := h.Get("Content-Type"), ""
if i := strings.Index(ct, ";"); i > 0 {
ct, rest = ct[:i], ct[i:]
}
// check if there are quotes around the content type
if strings.Contains(ct, "\"") {
header := strings.ReplaceAll(ct, "\"", "")
if rest != "" {
header += rest
}
h.Set("Content-Type", header)
if contenttype, params, err := h.ContentType(); err == nil {
return contenttype, params
}
}
// if all else fails, return text/plain
return "text/plain", nil
}
func ParseEntityStructure(e *message.Entity) (*models.BodyStructure, error) {
var body models.BodyStructure
contentType, ctParams, err := e.Header.ContentType()
if err != nil {
return nil, fmt.Errorf("could not parse content type: %v", err)
// try to fix the error; if all measures fail, then return a
// text/plain content type to display at least plaintext
contentType, ctParams = fixContentType(e.Header)
}
mimeType, mimeSubType := splitMIME(contentType)
body.MIMEType = mimeType
body.MIMESubType = mimeSubType

25
worker/lib/parse_test.go
View file

@ -10,6 +10,31 @@ import (
"git.sr.ht/~rjarry/aerc/models"
)
func TestMessageInfoParser(t *testing.T) {
rootDir := "testdata/message/valid"
msgFiles, err := ioutil.ReadDir(rootDir)
die(err)
for _, fi := range msgFiles {
if fi.IsDir() {
continue
}
p := fi.Name()
t.Run(p, func(t *testing.T) {
m := newMockRawMessageFromPath(filepath.Join(rootDir, p))
mi, err := MessageInfo(m)
if err != nil {
t.Fatal("Failed to create MessageInfo with:", err)
}
if perr := mi.Error; perr != nil {
t.Fatal("Expected no parsing error, but got:", mi.Error)
}
})
}
}
func TestMessageInfoHandledError(t *testing.T) {
rootDir := "testdata/message/invalid"
msgFiles, err := ioutil.ReadDir(rootDir)

45
worker/lib/testdata/message/valid/quoted-mime-type vendored Normal file
View file

@ -0,0 +1,45 @@
Subject: Your ECOLINES tickets
X-PHP-Originating-Script: 33:functions.inc.php
From: ECOLINES <ecolines@ecolines.lv>
Content-Type: multipart/mixed;
boundary="PHP-mixed-ba319678ca12656cfb8cd46e736ce09d"
Message-Id: <E1nvIQS-0004tm-Bc@legacy.ecolines.net>
Date: Sun, 29 May 2022 15:53:44 +0300
--PHP-mixed-ba319678ca12656cfb8cd46e736ce09d
Content-Type: multipart/alternative; boundary="PHP-alt-ba319678ca12656cfb8cd46e736ce09d"
--PHP-alt-ba319678ca12656cfb8cd46e736ce09d
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: 7bit
Your tickets are attached to this message. Also You can print out Your tickets from our website www.ecolines.net<b
r />
…
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Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: 7bit
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
…
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Content-Transfer-Encoding: base64
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Content-Transfer-Encoding: base64
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…
--PHP-mixed-ba319678ca12656cfb8cd46e736ce09d--