tsk-51: Added function to extract id from the token

src/token_stuff/mod.rs

@@ -41,12 +41,47 @@ pub fn create_service_token(provided: &String, id: &uuid::Uuid) -> Result<(Strin
 }
 
 pub fn verify_token(key: &String, token: &String) -> bool {
-    let ver = Hs256.verifier_from_bytes(key.as_bytes()).unwrap();
-    let (payload, _header) = jwt::decode_with_verifier(token, &ver).unwrap();
+    match get_payload(key, token) {
+        Ok((payload, _header)) => {
             match payload.subject() {
                 Some(_sub) => true,
                 None => false,
             }
+        }
+        Err(_err) => {
+            false
+        }
+    }
+}
+
+pub fn extract_id_from_token(key: &String, token: &String) -> Result<uuid::Uuid, std::io::Error> {
+    match get_payload(key, token) {
+        Ok((payload, _header)) => {
+            match payload.claim("id") {
+                Some(id) => {
+                    match uuid::Uuid::parse_str(id.as_str().unwrap()) {
+                        Ok(extracted) => {
+                            Ok(extracted)
+                        }
+                        Err(err) => {
+                            Err(std::io::Error::other(err.to_string()))
+                        }
+                    }
+                }
+                None => {
+                    Err(std::io::Error::other("No claim found"))
+                }
+            }
+        }
+        Err(err) => {
+            Err(std::io::Error::other(err.to_string()))
+        }
+    }
+}
+
+fn get_payload(key: &String, token: &String) -> Result<(josekit::jwt::JwtPayload, josekit::jws::JwsHeader), josekit::JoseError> {
+    let ver = Hs256.verifier_from_bytes(key.as_bytes()).unwrap();
+    jwt::decode_with_verifier(token, &ver)
 }
 
 #[cfg(test)]