feat(activitypub-base): copy from movies-diary with username-based actor URLs

crates/adapters/activitypub-base/src/urls.rs

@@ -0,0 +1,30 @@
+use url::Url;
+
+use crate::error::Error;
+
+pub const AS_PUBLIC: &str = "https://www.w3.org/ns/activitystreams#Public";
+
+pub fn extract_user_id_from_url(url: &Url) -> Option<uuid::Uuid> {
+    let path = url.path();
+    path.strip_prefix("/users/")
+        .and_then(|s| s.split('/').next())
+        .and_then(|s| uuid::Uuid::parse_str(s).ok())
+}
+
+pub fn activity_url(base_url: &str) -> Result<Url, Error> {
+    Url::parse(&format!("{}/activities/{}", base_url, uuid::Uuid::new_v4()))
+        .map_err(|e| Error::bad_request(anyhow::anyhow!(e)))
+}
+
+pub fn actor_url(base_url: &str, user_id: uuid::Uuid) -> Url {
+    Url::parse(&format!("{}/users/{}", base_url, user_id))
+        .expect("base_url is always a valid URL prefix")
+}
+
+/// Extract the username segment from a /users/:username URL.
+pub fn extract_username_from_url(url: &Url) -> Option<String> {
+    url.path()
+        .strip_prefix("/users/")
+        .and_then(|s| s.split('/').next())
+        .map(|s| s.to_string())
+}