adding pods method of package managing

Pods/AppAuth/Source/AppAuthCore/OIDExternalUserAgentRequest.h

@@ -0,0 +1,37 @@
+/*! @file OIDExternalUserAgent.h
+    @brief AppAuth iOS SDK
+    @copyright
+        Copyright 2017 The AppAuth Authors. All Rights Reserved.
+    @copydetails
+        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.
+ */
+
+/*! @protocol OIDExternalUserAgent
+    @brief An interface that any external user-agent request may implement to use the
+        @c OIDExternalUserAgent flow.
+ */
+@protocol OIDExternalUserAgentRequest
+
+/*! @brief Method to create and return the complete request URL instance.
+    @return A @c NSURL instance which contains the URL to be opened in an external UI (i.e. browser)
+ */
+- (NSURL*)externalUserAgentRequestURL;
+
+/*! @brief If this external user-agent request has a redirect URL, this should return its scheme.
+        Since some external requests have optional callbacks (such as the end session endpoint), the
+        return value of this method is nullable.
+    @return A @c NSString instance that contains the scheme of a callback url, or nil if there is
+        no callback url for this request.
+ */
+- (NSString*)redirectScheme;
+@end