Use a single auth filter instead of a list

Author: jianghaolu

core/azure-core/src/main/java/com/microsoft/windowsazure/core/pipeline/apache/ApacheConfigSettings.java

@@ -100,13 +100,11 @@ public HttpClientBuilder applyConfig(HttpClientBuilder httpClientBuilder) {
             httpClientBuilder.addInterceptorFirst(new HttpHeaderRemovalFilter());
         }
 
-        if (properties.containsKey("AuthFilters"))
+        if (properties.containsKey("AuthFilter"))
         {
             @SuppressWarnings("unchecked")
-            ArrayList<ServiceRequestFilter> filters = (ArrayList<ServiceRequestFilter>) properties.get("AuthFilters");
-            for (ServiceRequestFilter filter : filters) {
-                httpClientBuilder.addInterceptorFirst(new FilterInterceptor(filter));
-            }
+            ServiceRequestFilter filter = (ServiceRequestFilter) properties.get("AuthFilter");
+            httpClientBuilder.addInterceptorFirst(new FilterInterceptor(filter));
         }
 
         return httpClientBuilder;

core/azure-core/src/main/java/com/microsoft/windowsazure/credentials/TokenCloudCredentials.java

@@ -116,16 +116,7 @@ public void setToken(String token) {
     @Override
     @SuppressWarnings("unchecked")
     public <T> void applyConfig(String profile, Map<String, Object> properties) {
-    	ArrayList<AdalAuthFilter> filters;
-    	if (!properties.containsKey("AuthFilters"))
-    	{
-    		filters = new ArrayList<AdalAuthFilter>();
-    		properties.put("AuthFilters", filters);
-    	} else {
-    		filters = (ArrayList<AdalAuthFilter>)properties.get("AuthFilters");
-    	}
-    	
-    	filters.add(new AdalAuthFilter(this.token));
+        properties.put("AuthFilter", new AdalAuthFilter(this.token));
     }
 
 }

services/keyvault/azure-keyvault/src/main/java/com/microsoft/azure/keyvault/authentication/KeyVaultCredentials.java

@@ -30,6 +30,7 @@
 import com.microsoft.windowsazure.core.pipeline.filter.ServiceRequestContext;
 import com.microsoft.windowsazure.core.pipeline.filter.ServiceRequestFilter;
 import com.microsoft.windowsazure.credentials.CloudCredentials;
+import org.apache.http.auth.AUTH;
 
 /**
  * An implementation of {@link CloudCredentials} that supports automatic bearer
@@ -38,7 +39,7 @@
  */
 public abstract class KeyVaultCredentials extends CloudCredentials implements BearerCredentialsSupport {
 
-    private static final String AUTH_FILTERS_KEY = "AuthFilters";
+    private static final String AUTH_FILTERS_KEY = "AuthFilter";
 
     private final HashMap<String, Map<String, String>> cachedChallenges = new HashMap<String, Map<String, String>>();
 
@@ -48,17 +49,7 @@ public <T> void applyConfig(String profile, Map<String, Object> properties) {
 
         // Modifies properties to add our authenticating filter.
 
-        // First get the existing list of filters...
-        ArrayList<ServiceRequestFilter> filters;
-        if (!properties.containsKey(AUTH_FILTERS_KEY)) {
-            filters = new ArrayList<ServiceRequestFilter>();
-            properties.put(AUTH_FILTERS_KEY, filters);
-        } else {
-            filters = (ArrayList<ServiceRequestFilter>) properties.get(AUTH_FILTERS_KEY);
-        }
-
-        // ...then we add our filter.
-        filters.add(new ServiceRequestFilter() {
+        properties.put(AUTH_FILTERS_KEY, new ServiceRequestFilter() {
 
             @Override
             public void filter(ServiceRequestContext request) {