fix: properly expose static cred provider and fix common runtime initialize (#287)

Author: kneekey23

AWSClientRuntime/Sources/Auth/AWSCredentials.swift

@@ -8,18 +8,21 @@
 import AwsCommonRuntimeKit
 
 public struct AWSCredentials {
-    let accessKey: String?
-    let secret: String?
-    let sessionToken: String?
+    let accessKey: String
+    let secret: String
     let expirationTimeout: UInt64
+    let sessionToken: String?
+    
+    public init(accessKey: String, secret: String, expirationTimeout: UInt64, sessionToken: String? = nil) {
+        self.accessKey = accessKey
+        self.secret = secret
+        self.expirationTimeout = expirationTimeout
+        self.sessionToken = sessionToken
+    }
 }
 
 extension AWSCredentials {
-    func toCRTType() -> CRTCredentials? {
-        guard let accessKey = accessKey,
-              let secret = secret else {
-            return nil
-        }
+    func toCRTType() -> CRTCredentials {
         return CRTCredentials(accessKey: accessKey,
                               secret: secret,
                               sessionToken: sessionToken,

AWSClientRuntime/Sources/Auth/AWSCredentialsProvider.swift

@@ -28,14 +28,9 @@ public class AWSCredentialsProvider {
     }
 
     public static func fromStatic(_ credentials: AWSCredentials) throws -> AWSCredentialsProvider {
-        guard let accessKey = credentials.accessKey,
-              let secret = credentials.secret,
-              let sessionToken = credentials.sessionToken else {
-            throw ClientError.authError("Unable to create static credentials provider.  Required: accessKey, secret, and sessionToken.")
-        }
-        let config = AWSCredentialsProviderStaticConfig(accessKey: accessKey,
-                                                        secret: secret,
-                                                        sessionToken: sessionToken)
+        let config = AWSCredentialsProviderStaticConfig(accessKey: credentials.accessKey,
+                                                        secret: credentials.secret,
+                                                        sessionToken: credentials.sessionToken)
         let credsProvider = try CRTAWSCredentialsProvider(fromStatic: config.toCRTType())
         return AWSCredentialsProvider(awsCredentialsProvider: credsProvider)
     }
@@ -55,9 +50,13 @@ public class AWSCredentialsProvider {
     public func getCredentials() throws -> AWSCredentials {
         let credentials = crtCredentialsProvider.getCredentials()
         let result = try credentials.get()
-        return AWSCredentials(accessKey: result.getAccessKey(),
-                              secret: result.getSecret(),
-                              sessionToken: result.getSessionToken(),
-                              expirationTimeout: result.getExpirationTimeout())
+        guard let accessKey = result.getAccessKey(),
+              let secret = result.getSecret() else {
+            throw ClientError.authError("Unable to get credentials.  Required: accessKey, secret.")
+        }
+        return AWSCredentials(accessKey: accessKey,
+                              secret: secret,
+                              expirationTimeout: result.getExpirationTimeout(),
+                              sessionToken: result.getSessionToken())
     }
 }

AWSClientRuntime/Sources/Auth/AWSCredentialsProviderStaticConfig.swift

@@ -14,11 +14,11 @@ public struct AWSCredentialsProviderStaticConfig {
 
     public let secret: String
 
-    public let sessionToken: String
+    public let sessionToken: String?
 
     public init(accessKey: String,
                 secret: String,
-                sessionToken: String,
+                sessionToken: String? = nil,
                 shutDownCallback: ShutDownCallback? = nil) {
         self.accessKey = accessKey
         self.secret = secret
@@ -43,11 +43,11 @@ struct CredentialsProviderStaticConfig: CRTCredentialsProviderStaticConfigOption
 
     var secret: String
 
-    var sessionToken: String
+    var sessionToken: String?
 
     init(accessKey: String,
          secret: String,
-         sessionToken: String,
+         sessionToken: String? = nil,
          shutDownOptions: ShutDownCallback? = nil) {
         self.accessKey = accessKey
         self.secret = secret