Use base64 engine APIs instead of encode/decode

The `base64::encode`/`base64::decode` APIs were deprecated in version
0.21. See https://docs.rs/base64/latest/base64/index.html#usage.

Author: musicinmybrain

src/cookie_store.rs

@@ -1,4 +1,5 @@
 use crate::{async_trait, Result, Session, SessionStore};
+use base64::{engine::general_purpose::STANDARD, Engine as _};
 
 /// A session store that serializes the entire session into a Cookie.
 ///
@@ -32,14 +33,14 @@ impl CookieStore {
 #[async_trait]
 impl SessionStore for CookieStore {
     async fn load_session(&self, cookie_value: String) -> Result<Option<Session>> {
-        let serialized = base64::decode(cookie_value)?;
+        let serialized = STANDARD.decode(cookie_value)?;
         let session: Session = bincode::deserialize(&serialized)?;
         Ok(session.validate())
     }
 
     async fn store_session(&self, session: Session) -> Result<Option<String>> {
         let serialized = bincode::serialize(&session)?;
-        Ok(Some(base64::encode(serialized)))
+        Ok(Some(STANDARD.encode(serialized)))
     }
 
     async fn destroy_session(&self, _session: Session) -> Result {

src/session.rs

@@ -1,3 +1,4 @@
+use base64::{engine::general_purpose::STANDARD, Engine as _};
 use rand::RngCore;
 use serde::{Deserialize, Serialize};
 use std::{
@@ -91,7 +92,7 @@ impl Default for Session {
 fn generate_cookie(len: usize) -> String {
     let mut key = vec![0u8; len];
     rand::thread_rng().fill_bytes(&mut key);
-    base64::encode(key)
+    STANDARD.encode(key)
 }
 
 impl Session {
@@ -138,9 +139,9 @@ impl Session {
     /// # Ok(()) }) }
     /// ```
     pub fn id_from_cookie_value(string: &str) -> Result<String, base64::DecodeError> {
-        let decoded = base64::decode(string)?;
+        let decoded = STANDARD.decode(string)?;
         let hash = blake3::hash(&decoded);
-        Ok(base64::encode(hash.as_bytes()))
+        Ok(STANDARD.encode(hash.as_bytes()))
     }
 
     /// mark this session for destruction. the actual session record