git.r.bdr.sh - rbdr/olden-mail/blob - src/middleware/find_mailboxes_compatibility.rs

   1 use super::Middleware;
   2
   3 /// `MailDrop` can't find folders to sync because it implements `IMAPv3` and
   4 /// sends FIND MAILBOXES /*, which does not exist in `IMAPv4`.
   5 /// which is not understood by modern servers. It instead replaces it with
   6 /// a LIST command.
   7 pub struct FindMailboxesCompatibility {
   8     tags: Vec<String>,
   9 }
  10
  11 impl FindMailboxesCompatibility {
  12     pub fn new() -> Self {
  13         FindMailboxesCompatibility { tags: vec![] }
  14     }
  15 }
  16
  17 impl Middleware for FindMailboxesCompatibility {
  18     fn client_message(&mut self, input: &[u8]) -> Vec<u8> {
  19         let command = String::from_utf8_lossy(input);
  20         if command.contains("FIND MAILBOXES /*") {
  21             if let Some(tag) = command.split("FIND MAILBOXES /*").next() {
  22                 // We'll need to convert the LIST to a FIND
  23                 self.tags.push(tag.trim().to_string());
  24                 let replacement = format!("{} LIST \"\" \"*\"\r\n", tag.trim());
  25                 return replacement.into_bytes();
  26             }
  27         }
  28         input.to_vec()
  29     }
  30
  31     fn server_message(&mut self, input: &[u8]) -> Vec<u8> {
  32         let command = String::from_utf8_lossy(input);
  33         let contains_ok_completed = self
  34             .tags
  35             .iter()
  36             .any(|tag| command.contains(&format!("{tag} OK Completed")));
  37
  38         // We want to only modify responses that were a result of a MAILBOX call.
  39         if !contains_ok_completed {
  40             return input.to_vec();
  41         }
  42
  43         let lines: Vec<String> = command
  44             .lines()
  45             .filter_map(|line| {
  46                 // The IMAPv3 spec specifically says INBOX is excluded from MAILBOX
  47                 if line.starts_with("* LIST") && line.trim_end().ends_with("\"/\" INBOX") {
  48                     return None;
  49                 }
  50
  51                 // Transform IMAPv4 "* LIST" lines to IMAPv3 "* MAILBOX"
  52                 if line.starts_with("* LIST") {
  53                     if let Some(last_slash_pos) = line.rfind("\"/\"") {
  54                         let mailbox_name = line[(last_slash_pos + 1)..].replace('"', "");
  55                         return Some(format!("* MAILBOX {}\r", mailbox_name.trim()));
  56                     }
  57                 }
  58
  59                 Some(line.to_string())
  60             })
  61             .collect();
  62
  63         lines.join("\n").into_bytes()
  64     }
  65 }