Changed form parameter parser method to use request input stream instead of the raw API Gateway event body to address #141.

Author: sapessi

aws-serverless-java-container-core/src/main/java/com/amazonaws/serverless/proxy/internal/servlet/AwsProxyHttpServletRequest.java

@@ -25,6 +25,7 @@
 import org.apache.commons.fileupload.FileUploadException;
 import org.apache.commons.fileupload.disk.DiskFileItemFactory;
 import org.apache.commons.fileupload.servlet.ServletFileUpload;
+import org.apache.commons.io.IOUtils;
 import org.apache.commons.io.input.NullInputStream;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -756,7 +757,12 @@ private Map<String, List<String>> getFormUrlEncodedParametersMap() {
             return urlEncodedFormParameters;
         }
         Timer.start("SERVLET_REQUEST_GET_FORM_PARAMS");
-        String rawBodyContent = request.getBody();
+        String rawBodyContent = null;
+        try {
+            rawBodyContent = IOUtils.toString(getInputStream());
+        } catch (IOException e) {
+            throw new RuntimeException(e);
+        }
 
         urlEncodedFormParameters = new TreeMap<>(String.CASE_INSENSITIVE_ORDER);
         for (String parameter : rawBodyContent.split(FORM_DATA_SEPARATOR)) {

aws-serverless-java-container-core/src/test/java/com/amazonaws/serverless/proxy/internal/servlet/AwsProxyHttpServletRequestFormTest.java

@@ -15,6 +15,9 @@
 import javax.ws.rs.core.MediaType;
 
 import java.io.IOException;
+import java.nio.charset.Charset;
+import java.util.Base64;
+import java.util.Map;
 import java.util.Random;
 
 import static org.junit.Assert.assertEquals;
@@ -102,4 +105,18 @@ public void multipart_getParts_binary() {
             fail(e.getMessage());
         }
     }
+
+    @Test
+    public void postForm_getParamsBase64Encoded_expectAllParams() {
+        AwsProxyRequest proxyRequest = new AwsProxyRequestBuilder("/form", "POST")
+                                               .header(HttpHeaders.CONTENT_TYPE, MediaType.APPLICATION_FORM_URLENCODED).build();
+        proxyRequest.setBody(Base64.getEncoder().encodeToString(ENCODED_FORM_ENTITY.getBytes(Charset.defaultCharset())));
+        proxyRequest.setIsBase64Encoded(true);
+
+        HttpServletRequest request = new AwsProxyHttpServletRequest(proxyRequest, null, null);
+        Map<String, String[]> params = request.getParameterMap();
+        assertNotNull(params);
+        assertEquals(2, params.size());
+        assertEquals(true, params.containsKey(PART_KEY_1));
+    }
 }