fix: Prevent panic in GetMetrics gRPC handler on invalid input (#1291)

Co-authored-by: Copilot <198982749+Copilot@users.noreply.github.com>
Co-authored-by: houseme <4829346+houseme@users.noreply.github.com>

crates/credentials/src/constants.rs

@@ -0,0 +1,94 @@
+// Copyright 2024 RustFS Team
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/// Default Access Key
+/// Default value: rustfsadmin
+/// Environment variable: RUSTFS_ACCESS_KEY
+/// Command line argument: --access-key
+/// Example: RUSTFS_ACCESS_KEY=rustfsadmin
+/// Example: --access-key rustfsadmin
+pub const DEFAULT_ACCESS_KEY: &str = "rustfsadmin";
+/// Default Secret Key
+/// Default value: rustfsadmin
+/// Environment variable: RUSTFS_SECRET_KEY
+/// Command line argument: --secret-key
+/// Example: RUSTFS_SECRET_KEY=rustfsadmin
+/// Example: --secret-key rustfsadmin
+pub const DEFAULT_SECRET_KEY: &str = "rustfsadmin";
+
+/// Environment variable for gRPC authentication token
+/// Used to set the authentication token for gRPC communication
+/// Example: RUSTFS_GRPC_AUTH_TOKEN=your_token_here
+/// Default value: No default value. RUSTFS_SECRET_KEY value is recommended.
+pub const ENV_GRPC_AUTH_TOKEN: &str = "RUSTFS_GRPC_AUTH_TOKEN";
+
+/// IAM Policy Types
+/// Used to differentiate between embedded and inherited policies
+/// Example: "embedded-policy" or "inherited-policy"
+/// Default value: "embedded-policy"
+pub const EMBEDDED_POLICY_TYPE: &str = "embedded-policy";
+
+/// IAM Policy Types
+/// Used to differentiate between embedded and inherited policies
+/// Example: "embedded-policy" or "inherited-policy"
+/// Default value: "inherited-policy"
+pub const INHERITED_POLICY_TYPE: &str = "inherited-policy";
+
+/// IAM Policy Claim Name for Service Account
+/// Used to identify the service account policy claim in JWT tokens
+/// Example: "sa-policy"
+/// Default value: "sa-policy"
+pub const IAM_POLICY_CLAIM_NAME_SA: &str = "sa-policy";
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_security_constants() {
+        // Test security related constants
+        assert_eq!(DEFAULT_ACCESS_KEY, "rustfsadmin");
+        assert!(DEFAULT_ACCESS_KEY.len() >= 8, "Access key should be at least 8 characters");
+
+        assert_eq!(DEFAULT_SECRET_KEY, "rustfsadmin");
+        assert!(DEFAULT_SECRET_KEY.len() >= 8, "Secret key should be at least 8 characters");
+
+        // In production environment, access key and secret key should be different
+        // These are default values, so being the same is acceptable, but should be warned in documentation
+        println!("Warning: Default access key and secret key are the same. Change them in production!");
+    }
+
+    #[test]
+    fn test_security_best_practices() {
+        // Test security best practices
+
+        // These are default values, should be changed in production environments
+        println!("Security Warning: Default credentials detected!");
+        println!("Access Key: {DEFAULT_ACCESS_KEY}");
+        println!("Secret Key: {DEFAULT_SECRET_KEY}");
+        println!("These should be changed in production environments!");
+
+        // Verify that key lengths meet minimum security requirements
+        assert!(DEFAULT_ACCESS_KEY.len() >= 8, "Access key should be at least 8 characters");
+        assert!(DEFAULT_SECRET_KEY.len() >= 8, "Secret key should be at least 8 characters");
+
+        // Check if default credentials contain common insecure patterns
+        let _insecure_patterns = ["admin", "password", "123456", "default"];
+        let _access_key_lower = DEFAULT_ACCESS_KEY.to_lowercase();
+        let _secret_key_lower = DEFAULT_SECRET_KEY.to_lowercase();
+
+        // Note: More security check logic can be added here
+        // For example, check if keys contain insecure patterns
+    }
+}