fix(tee): lowercase enum TEE types (#2798)

## What ❔

We encountered an issue where the staging environment was unable to
deserialize `sgx` to `TeeType::Sgx`. Relevant code:
-
https://github.com/matter-labs/zksync-era/blob/87b02e3ab5c1f61d59dd0f0eefa9ec33a7b55488/core/lib/basic_types/src/tee_types.rs#L7
-
https://github.com/matter-labs/teepot/blob/537521f0ee2bd704fb839fe336f43f8aab5887df/bin/tee-key-preexec/src/main.rs#L53

Relevant logs:
- https://grafana.matterlabs.dev/goto/Q5ENugeSR?orgId=1

## Why ❔

To fix a panic in the staging environment.

## Checklist

- [x] PR title corresponds to the body of PR (we generate changelog
entries from PRs).
- [x] Tests for the changes have been added / updated.
- [ ] Documentation comments have been added / updated.
- [x] Code has been formatted via `zk fmt` and `zk lint`.

core/lib/basic_types/src/tee_types.rs

@@ -1,9 +1,49 @@
+use std::fmt;
+
 use serde::{Deserialize, Serialize};
-use strum::{Display, EnumString};
 
-#[derive(Debug, Clone, Copy, PartialEq, EnumString, Display, Serialize, Deserialize)]
+#[derive(Debug, Clone, Copy, PartialEq, Serialize, Deserialize)]
+#[serde(rename_all = "lowercase")]
 #[non_exhaustive]
 pub enum TeeType {
-    #[strum(serialize = "sgx")]
     Sgx,
 }
+
+impl fmt::Display for TeeType {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            TeeType::Sgx => write!(f, "sgx"),
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use serde_json;
+
+    use super::*;
+
+    #[test]
+    fn test_serialize_teetype() {
+        let json_str = "\"sgx\"";
+        let tee_type: TeeType = serde_json::from_str(json_str).unwrap();
+        assert_eq!(tee_type, TeeType::Sgx);
+
+        for json_str in &["\"Sgx\"", "\"SGX\""] {
+            let result: Result<TeeType, _> = serde_json::from_str(json_str);
+            assert!(result.is_err());
+        }
+    }
+
+    #[test]
+    fn test_deserialize_teetype() {
+        let tee_type = TeeType::Sgx;
+        let json_str = serde_json::to_string(&tee_type).unwrap();
+        assert_eq!(json_str, "\"sgx\"");
+    }
+
+    #[test]
+    fn test_display_teetype() {
+        assert_eq!(TeeType::Sgx.to_string(), "sgx");
+    }
+}

core/lib/prover_interface/tests/job_serialization.rs

@@ -170,7 +170,7 @@ fn test_tee_proof_request_serialization() {
         "signature": [ 0, 1, 2, 3, 4 ],
         "pubkey": [ 5, 6, 7, 8, 9 ],
         "proof": [ 10, 11, 12, 13, 14 ],
-        "tee_type": "Sgx"
+        "tee_type": "sgx"
     }"#;
     let tee_proof_result = serde_json::from_str::<SubmitTeeProofRequest>(tee_proof_str).unwrap();
     let tee_proof_expected = SubmitTeeProofRequest(Box::new(L1BatchTeeProofForL1 {

core/node/proof_data_handler/src/tests.rs

@@ -94,7 +94,7 @@ async fn request_tee_proof_inputs() {
         },
         L1BatchCommitmentMode::Rollup,
     );
-    let req_body = Body::from(serde_json::to_vec(&json!({ "tee_type": "Sgx" })).unwrap());
+    let req_body = Body::from(serde_json::to_vec(&json!({ "tee_type": "sgx" })).unwrap());
     let response = app
         .oneshot(
             Request::builder()
@@ -134,7 +134,7 @@ async fn submit_tee_proof() {
         "signature": [ 0, 1, 2, 3, 4 ],
         "pubkey": [ 5, 6, 7, 8, 9 ],
         "proof": [ 10, 11, 12, 13, 14 ],
-        "tee_type": "Sgx"
+        "tee_type": "sgx"
     }"#;
     let tee_proof_request =
         serde_json::from_str::<SubmitTeeProofRequest>(tee_proof_request_str).unwrap();