Change default credential to nil

Author: stevapple

Sources/TencentSCFRuntimeCore/SCFContext.swift

@@ -106,10 +106,17 @@ extension SCF {
             .init(stringLiteral: SCF.Env["SCF_FUNCTIONVERSION"] ?? "")
         }
 
-        public var credential: TencentCloud.Credential {
-            .init(secretId: SCF.Env["TENCENTCLOUD_SECRETID"] ?? "",
-                  secretKey: SCF.Env["TENCENTCLOUD_SECRETKEY"] ?? "",
-                  sessionToken: SCF.Env["TENCENTCLOUD_SESSIONTOKEN"] ?? "")
+        /// The role credential from SCF environment.
+        public var credential: TencentCloud.Credential? {
+            if let secretId = SCF.Env["TENCENTCLOUD_SECRETID"],
+                let secretKey = SCF.Env["TENCENTCLOUD_SECRETKEY"]
+            {
+                return TencentCloud.Credential(secretId: secretId,
+                                               secretKey: secretKey,
+                                               sessionToken: SCF.Env["TENCENTCLOUD_SESSIONTOKEN"])
+            } else {
+                return nil
+            }
         }
 
         /// `Logger` to log with.

Tests/TencentSCFRuntimeCoreTests/SCFContextTest.swift

@@ -34,9 +34,7 @@ class SCFContextTest: XCTestCase {
         XCTAssertEqual(context.name, "my-swift-function")
         XCTAssertEqual(context.namespace, "default")
         XCTAssertEqual(context.version, .latest)
-        XCTAssertEqual(context.credential.secretId, "")
-        XCTAssertEqual(context.credential.secretKey, "")
-        XCTAssertEqual(context.credential.sessionToken, "")
+        XCTAssertNil(context.credential)
     }
 
     func testEnvUpdateWithDict() {
@@ -68,14 +66,15 @@ class SCFContextTest: XCTestCase {
         XCTAssertEqual(context.name, "another-swift-function")
         XCTAssertEqual(context.namespace, "custom")
         XCTAssertEqual(context.version, .version(2))
-        XCTAssertEqual(context.credential.secretId, "SECRET_ID")
-        XCTAssertEqual(context.credential.secretKey, "SECRET_KEY")
-        XCTAssertEqual(context.credential.sessionToken, "SESSION_TOKEN")
+        XCTAssertNotNil(context.credential)
+        XCTAssertEqual(context.credential?.secretId, "SECRET_ID")
+        XCTAssertEqual(context.credential?.secretKey, "SECRET_KEY")
+        XCTAssertEqual(context.credential?.sessionToken, "SESSION_TOKEN")
 
         SCF.Env.reset()
     }
 
-    func testEnvSet() {
+    func testEnvSetDirectly() {
         let customEnvironment = [
             "TENCENTCLOUD_UIN": "100000000003",
             "TENCENTCLOUD_APPID": "1250000002",
@@ -106,9 +105,10 @@ class SCFContextTest: XCTestCase {
         XCTAssertEqual(context.name, "another-swift-function")
         XCTAssertEqual(context.namespace, "custom")
         XCTAssertEqual(context.version, .version(2))
-        XCTAssertEqual(context.credential.secretId, "SECRET_ID")
-        XCTAssertEqual(context.credential.secretKey, "SECRET_KEY")
-        XCTAssertEqual(context.credential.sessionToken, "SESSION_TOKEN")
+        XCTAssertNotNil(context.credential)
+        XCTAssertEqual(context.credential?.secretId, "SECRET_ID")
+        XCTAssertEqual(context.credential?.secretKey, "SECRET_KEY")
+        XCTAssertEqual(context.credential?.sessionToken, "SESSION_TOKEN")
 
         SCF.Env.reset()
     }