Fix: Use strum string to parse AA token type string

Signed-off-by: Jiale Zhang <zhangjiale@linux.alibaba.com>

attestation-agent/lib/src/lib.rs

@@ -13,6 +13,7 @@ use attester::{detect_tee_type, BoxedAttester};
 use kbc::{AnnotationPacket, KbcCheckInfo, KbcInstance, KbcModuleList};
 use resource_uri::ResourceUri;
 use std::collections::HashMap;
+use std::str::FromStr;
 
 pub mod config;
 mod token;
@@ -198,7 +199,7 @@ impl AttestationAPIs for AttestationAgent {
             }
         };
 
-        let _token = match serde_json::from_str::<TokenType>(_token_type)
+        let _token = match TokenType::from_str(_token_type)
             .map_err(|e| anyhow!("Unsupported token type: {e}"))?
         {
             #[cfg(feature = "kbs")]

attestation-agent/lib/src/token/mod.rs

@@ -5,22 +5,22 @@
 
 use anyhow::Result;
 use async_trait::async_trait;
-use serde::{Deserialize, Serialize};
+use strum::EnumString;
 
 #[cfg(feature = "kbs")]
 pub mod kbs;
 
 #[cfg(feature = "coco_as")]
 pub mod coco_as;
 
-#[derive(Serialize, Deserialize, Clone, Copy)]
+#[derive(EnumString, Clone, Copy)]
 pub enum TokenType {
     #[cfg(feature = "kbs")]
-    #[serde(rename = "kbs")]
+    #[strum(serialize = "kbs")]
     Kbs,
 
     #[cfg(feature = "coco_as")]
-    #[serde(rename = "coco_as")]
+    #[strum(serialize = "coco_as")]
     CoCoAS,
 }