fix: oauth1 signing for url encoded content (#538)

* Fixed OAuth 1.0 signing for requests with URL Encoded Content (typical of POST and PUT HTTP methods)

A simple change the the OAuthParameters intercept method that checks if the request has UrlEncodedContent.  If it does, then its content is added to the GenericUrl so that the signature can be computed correctly.  After the call to computeSignature, the content parameters are removed from the GenericUrl to leave it in its original form.

As per the OAuth 1.0 spec here (https://tools.ietf.org/html/rfc5849#page-28), any form encoded request body with a Content-Type of "application/x-www-form-urlencoded" must be included when the request signature is created.

* Changes to support java 1.7.  Also added new test code.

* style: expanded the wild card imports.

google-oauth-client/src/main/java/com/google/api/client/auth/oauth/OAuthParameters.java

@@ -14,15 +14,19 @@
 
 package com.google.api.client.auth.oauth;
 
+import com.google.api.client.http.HttpContent;
 import com.google.api.client.http.GenericUrl;
 import com.google.api.client.http.HttpExecuteInterceptor;
 import com.google.api.client.http.HttpRequest;
 import com.google.api.client.http.HttpRequestInitializer;
+import com.google.api.client.http.UrlEncodedContent;
 import com.google.api.client.util.Beta;
+import com.google.api.client.util.Data;
 import com.google.api.client.util.escape.PercentEscaper;
 import com.google.common.collect.Multiset;
 import com.google.common.collect.SortedMultiset;
 import com.google.common.collect.TreeMultiset;
+
 import java.io.IOException;
 import java.security.GeneralSecurityException;
 import java.security.SecureRandom;
@@ -53,7 +57,8 @@
  * @author Yaniv Inbar
  */
 @Beta
-public final class OAuthParameters implements HttpExecuteInterceptor, HttpRequestInitializer {
+public final class OAuthParameters implements HttpExecuteInterceptor, HttpRequestInitializer
+{
 
   /** Secure random number generator to sign requests. */
   private static final SecureRandom RANDOM = new SecureRandom();
@@ -271,7 +276,19 @@ public void intercept(HttpRequest request) throws IOException {
     computeNonce();
     computeTimestamp();
     try {
-      computeSignature(request.getRequestMethod(), request.getUrl());
+      GenericUrl url = request.getUrl();
+      HttpContent content = request.getContent();
+      Map<String, Object> urlEncodedParams = null;
+      if (content instanceof UrlEncodedContent) {
+        urlEncodedParams = Data.mapOf(((UrlEncodedContent) content).getData());
+        url.putAll(urlEncodedParams);
+      }
+      computeSignature(request.getRequestMethod(), url);
+      if (urlEncodedParams != null) {
+        for (Map.Entry<String, Object> entry : urlEncodedParams.entrySet()) {
+          url.remove(entry.getKey());
+        }
+      }
     } catch (GeneralSecurityException e) {
       IOException io = new IOException();
       io.initCause(e);

google-oauth-client/src/test/java/com/google/api/client/auth/oauth/OAuthParametersTest.java

@@ -15,7 +15,15 @@
 package com.google.api.client.auth.oauth;
 
 import com.google.api.client.http.GenericUrl;
+
+import java.io.IOException;
 import java.security.GeneralSecurityException;
+import java.util.Collections;
+import java.util.Map;
+
+import com.google.api.client.http.HttpRequest;
+import com.google.api.client.http.UrlEncodedContent;
+import com.google.api.client.http.javanet.NetHttpTransport;
 import junit.framework.TestCase;
 
 /**
@@ -75,6 +83,22 @@ public void testSignature() throws GeneralSecurityException {
         parameters.signature);
   }
 
+  public void testSignatureWithUrlEncodedContent() throws IOException {
+    OAuthParameters parameters = new OAuthParameters();
+    parameters.signer = new MockSigner();
+
+    GenericUrl url = new GenericUrl("https://example.local?foo=bar");
+    Map<String, Object> contentParameters = Collections.singletonMap("this", (Object) "that");
+    UrlEncodedContent content = new UrlEncodedContent(contentParameters);
+
+    HttpRequest request = new NetHttpTransport.Builder().build()
+            .createRequestFactory().buildPostRequest(url, content);
+    parameters.intercept(request);
+
+    assertTrue(parameters.signature.endsWith("%26this%3Dthat"));
+    assertEquals("https://example.local?foo=bar", url.build());
+  }
+
   public void testSignatureWithRepeatedParameter() throws GeneralSecurityException {
     OAuthParameters parameters = new OAuthParameters();
     parameters.signer = new MockSigner();