Add support for topic credentials (#17)

* Add Topic Credentials

* Update changelog

Bump the version to 0.5.1

Changelog.md

@@ -1,8 +1,34 @@
-### 0.1.1 - 2018/08/27
+# Changelog
+
+## 0.5.1 - 2018/09/18
+
+- Add TopicCredentials
+
+## 0.5.0 - 2018/08/16
+
+- Added support for MSI authentication
+- Updated ms-rest-js package to 0.19 version
+- Updated ms-rest-azure-env package to 0.1.1 version
+
+## 0.4.0 - 2018/08/08
+
+- Updated ms-rest-js package to 0.18 version
+
+## 0.3.0 - 2018/08/06
+
+- Updated ms-rest-js package to 0.17 version
+
+## 0.2.0 - 2018/07/27
+
+- Updated ms-rest-js package to 0.14 version
+
+## 0.1.1 - 2018/08/27
+
 - Domain is no longer a required parameter for MSITokenCredentials.
 - Rename LoginWithMSIOptions interface to MSIOptions
 
-### 0.1.0 - 2017/09/16
+## 0.1.0 - 2017/09/16
+
 - Initial version of ms-rest-nodeauth
 - Provides following flavors of authentication in different Azure Clouds
   - Authentication via service principal

lib/credentials/topicCredentials.ts

@@ -0,0 +1,29 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT License. See License.txt in the project root for license information.
+
+import { ApiKeyCredentials } from "ms-rest-js";
+
+/**
+ * Creates a new CognitiveServicesCredentials object.
+ */
+export class TopicCredentials extends ApiKeyCredentials {
+  /**
+   * Creates a new EventGrid TopicCredentials object.
+   *
+   * @constructor
+   * @param {string} topicKey   The EventGrid topic key
+   */
+  constructor(topicKey: string) {
+    if (!topicKey || (topicKey && typeof topicKey !== "string")) {
+      throw new Error(`topicKey cannot be null or undefined and must be of type string.`);
+    }
+
+    const options = {
+      inHeader: {
+        "aeg-sas-key": topicKey
+      }
+    };
+
+    super(options);
+  }
+}

package.json

@@ -5,7 +5,7 @@
     "email": "azsdkteam@microsoft.com",
     "url": "https://github.com/Azure/ms-rest-nodeauth"
   },
-  "version": "0.5.0",
+  "version": "0.5.1",
   "description": "Azure Authentication library in node.js with type definitions.",
   "tags": [
     "node",