improved file type detection

Cargo.lock

@@ -893,6 +893,7 @@ dependencies = [
  "http-body-util",
  "infer",
  "jsonwebtoken",
+ "mime_guess",
  "password-hash",
  "reqwest",
  "serde",

Cargo.toml

@@ -14,6 +14,7 @@ clap = { version = "4.5.53", features = ["derive"] }
 dashmap = "6.1.0"
 infer = "0.19.0"
 jsonwebtoken = "9.3.1"
+mime_guess = "2.0.5"
 password-hash = "0.5.0"
 serde = { version = "1.0.219", features = ["derive"] }
 serde_json = "1.0.143"

src/routes/messages.rs

@@ -406,17 +406,21 @@ async fn create_message_with_attachments(
                 return Err(APIError::FileTooLarge);
             }
 
-            // Determine file type
-            let kind = infer::get(&data);
-            let mime = kind
-                .map(|k| k.mime_type())
+            let mut mime = mime_guess::from_path(&file_name)
+                .first_raw()
                 .unwrap_or("application/octet-stream");
 
+            if mime == "application/octet-stream" {
+                if let Some(kind) = infer::get(&data) {
+                    mime = kind.mime_type();
+                }
+            }
+
             let file_type = if mime.starts_with("image/") {
                 "image"
             } else if mime.starts_with("video/") {
                 "video"
-            } else if mime.starts_with("text/") {
+            } else if mime.starts_with("text/") || std::str::from_utf8(&data).is_ok() {
                 "textfile"
             } else {
                 "binaryfile"