change user_id encoding to hex

Cargo.toml

@@ -1,11 +1,10 @@
 [package]
 name = "colink-server"
-version = "0.1.9"
+version = "0.1.10"
 edition = "2021"
 
 [dependencies]
 async-trait = "0.1"
-base64 = "0.13.0"
 chrono = "0.4"
 futures-lite = "1.12"
 hex = "0.4"

src/service/auth.rs

@@ -84,7 +84,7 @@ impl crate::server::MyService {
             ));
         }
         self.check_user_consent(&user_consent_to_be_checked, &self.public_key.serialize())?;
-        let user_id = base64::encode(&user_public_key.serialize());
+        let user_id = hex::encode(&user_public_key.serialize());
         let mq_uri = match self.mq.create_user_account().await {
             Ok(mq_uri) => mq_uri,
             Err(e) => return Err(Status::internal(e)),

src/service/task.rs

@@ -561,7 +561,7 @@ impl crate::server::MyService {
         }
         self.check_user_consent(decision.user_consent.as_ref().unwrap(), core_public_key_vec)?;
         // After checking user consent, we need to verify that the user_id match up with the UserConsent's user public key.
-        let user_pubilc_key_vec_from_userid: &Vec<u8> = &base64::decode(user_id).unwrap();
+        let user_pubilc_key_vec_from_userid: &Vec<u8> = &hex::decode(user_id).unwrap();
         let user_public_key_vec_from_userconsent: &Vec<u8> =
             &decision.user_consent.as_ref().unwrap().public_key;
         if user_pubilc_key_vec_from_userid != user_public_key_vec_from_userconsent {