Adjust middleware to modify responses

[rbdr/olden-mail] / src / middleware / find_mailboxes_compatibility.rs

diff --git a/src/middleware/find_mailboxes_compatibility.rs b/src/middleware/find_mailboxes_compatibility.rs
index f1a450b514e8b41856bbfc736a211153a22f6847..a1ddda20358d23c444e8db6513fb376058fb9937 100644 (file)
--- a/src/middleware/find_mailboxes_compatibility.rs
+++ b/src/middleware/find_mailboxes_compatibility.rs
@@ -1,14 +1,68 @@
 use log::debug;
 
 use log::debug;
 

-/// MailDrop can't find folders to sync because it sends FIND MAILBOXES /*
+use super::Middleware;
+
+/// `MailDrop` can't find folders to sync because it implements IMAPv3 and
+/// sends FIND MAILBOXES /*, which does not exist in IMAPv4.

 /// which is not understood by modern servers. It instead replaces it with
 /// a LIST command.
 /// which is not understood by modern servers. It instead replaces it with
 /// a LIST command.

-pub fn middleware(input: &[u8]) -> Vec<u8> {
-    let command = String::from_utf8_lossy(input);
-    if let Some(tag) = command.split("FIND MAILBOXES /*").next() {
-        let replacement = format!("{} LIST \"/INBOX\" \"*\"\r\n", tag.trim());
-        debug!("### {replacement}");
-        return replacement.into_bytes();
+pub struct FindMailboxesCompatibility {
+    tags: Vec<String>,
+}
+
+impl FindMailboxesCompatibility {
+    pub fn new() -> Self {
+        FindMailboxesCompatibility { tags: vec![] }
+    }
+}
+
+impl Middleware for FindMailboxesCompatibility {
+    fn client_message(&mut self, input: &[u8]) -> Vec<u8> {
+        let command = String::from_utf8_lossy(input);
+        if command.contains("FIND MAILBOXES /*") {
+            if let Some(tag) = command.split("FIND MAILBOXES /*").next() {
+                // We'll need to convert the LIST to a FIND
+                self.tags.push(tag.to_string());
+                let replacement = format!("{} LIST \"\" \"*\"\r\n", tag.trim());
+                debug!("### {replacement}");
+                return replacement.into_bytes();
+            }
+        }
+        input.to_vec()
+    }
+
+    fn server_message(&mut self, input: &[u8]) -> Vec<u8> {
+        let command = String::from_utf8_lossy(input);
+        let contains_ok_completed = self
+            .tags
+            .iter()
+            .any(|tag| command.contains(&format!("{} OK Completed", tag)));
+
+        // We want to only modify responses that were a result of a MAILBOX call.
+        if !contains_ok_completed {
+            return input.to_vec();
+        }
+
+        let lines: Vec<String> = command
+            .lines()
+            .filter_map(|line| {
+                // The IMAPv3 spec specifically says INBOX is excluded from MAILBOX
+                if line.starts_with("* LIST") && line.trim_end().ends_with("\"/\" INBOX") {
+                    return None;
+                }
+
+                // Transform IMAPv4 "* LIST" lines to IMAPv3 "* MAILBOX"
+                if line.starts_with("* LIST") {
+                    if let Some(last_slash_pos) = line.rfind('/') {
+                        let mailbox_name = line[(last_slash_pos + 1)..].trim();
+                        return Some(format!("* MAILBOX {}\r", mailbox_name));
+                    }
+                }
+
+                return Some(line.to_string());
+            })
+            .collect();
+
+        return lines.join("\n").into_bytes();

     }
     }

-    return input.to_vec();

 }
 }