Special char decoding (rfc2047)

Cargo.toml

@@ -25,6 +25,7 @@ num_cpus = "1.16.0"
 percent-encoding = "2.3.1"
 mailparse = "0.13"
 lazy_static = "1.5.0"
+rfc2047-decoder = "1.0.5"
 
 [profile.release]
 opt-level = "z"

src/smtp/mail.rs

@@ -1,6 +1,7 @@
 use mailparse::parse_mail;
 use serde::{Deserialize, Serialize};
 use std::collections::HashSet;
+use rfc2047_decoder::decode;
 
 #[derive(Default, Serialize, Deserialize)]
 pub struct Mail {
@@ -69,7 +70,8 @@ impl Mail {
 pub fn get_subject(data: &str) -> Option<String> {
     for line in data.lines() {
         if line.to_lowercase().starts_with("subject:") {
-            return Some(line[8..].trim().to_string());
+            let subject = line[8..].trim().to_string();
+            return Some(decode(&subject).unwrap_or(subject));
         }
     }
 

src/tests/parsing_tester.rs

@@ -6,6 +6,7 @@ mod parsing_tester {
     fn test_parse_body_multipart() {
         let body = std::fs::read_to_string("test/samples/discord_mail.body").unwrap();
         let subject = get_subject(&body);
+        println!("subject: {:?}", subject);
         let mail = Mail {
             from: Default::default(),
             to: Default::default(),
@@ -20,7 +21,8 @@ mod parsing_tester {
         let (from, _) = get_data_from_to(&mail.data);
         assert!(from.contains("[email protected]"));
 
-        assert_eq!(mail.subject.unwrap(), "Verify Email Address for Discord");
+        //should've decoded the subject with rfc2047 decoder
+        assert_eq!(mail.subject.unwrap(), "Vérifie ton adresse e-mail Discord");
     }
 
     #[test]

test/samples/discord_mail.body

@@ -18,7 +18,7 @@ Date: Fri, 27 Sep 2024 21:02:51 +0000 (UTC)
 From: Discord <[email protected]>
 Mime-Version: 1.0
 Message-ID: <U5GSwRpZSPWUCqqfA4y23g@geopod-ismtpd-2>
-Subject: Verify Email Address for Discord
+Subject: =?UTF-8?B?VsOpcmlmaWU=?= ton adresse e-mail Discord
 X-SG-EID:
  =?us-ascii?Q?u001=2Encph=2Fx3Jw0NdHDwq6twCdiOEjRqduaW+3S=2FWXBRXzv62NXoGt1LlW8ZOp?=
  =?us-ascii?Q?GajFHOcRQzla331F6ukAeYmLWbVWcEmwbstknFb?=