feat(ffi): add room display name to room alias transformation

bindings/matrix-sdk-ffi/Cargo.toml

@@ -46,6 +46,7 @@ url = { workspace = true }
 zeroize = { workspace = true }
 uuid = { version = "1.4.1", features = ["v4"] }
 language-tags = "0.3.2"
+regex = "1.11.1"
 
 [target.'cfg(target_os = "android")'.dependencies]
 paranoid-android = "0.2.1"

bindings/matrix-sdk-ffi/src/room_alias.rs

@@ -1,7 +1,22 @@
+use regex::Regex;
 use ruma::RoomAliasId;
 
 /// Verifies the passed `String` matches the expected room alias format.
 #[matrix_sdk_ffi_macros::export]
 fn is_room_alias_format_valid(alias: String) -> bool {
     RoomAliasId::parse(alias).is_ok()
+}
+
+/// Transforms a Room's display name into a valid room alias.
+#[matrix_sdk_ffi_macros::export]
+fn room_alias_from_room_display_name(room_name: String) -> String {
+    let whitespace_regex = Regex::new(r"\s+").unwrap();
+    let symbol_regex = Regex::new(r"[!#$&'()*+,/:;=?@\[\]]+").unwrap();
+
+    // Replace whitespaces with `-`
+    let sanitised = whitespace_regex.replace_all(&room_name, "-");
+    // Remove problematic symbols
+    let sanitised = symbol_regex.replace_all(&sanitised, "");
+    // Lowercased
+    sanitised.to_lowercase()
 }