allow single "=" as query (#5823)

* allow single = as query

* unit test added

* changelog added

* changed the behavior

* minor change

* more test cases added

Author: Fred1155

.changes/next-release/bugfix-AWSSDKforJavav2-466bf4c.json

@@ -0,0 +1,6 @@
+{
+    "type": "bugfix",
+    "category": "AWS SDK for Java v2",
+    "contributor": "",
+    "description": "Fixed an issue in SdkHttpUtils used in SdkHttpFullRequest where constructing with a query string consisting of a single \"=\" would throw an ArrayIndexOutOfBoundsException."
+}

http-client-spi/src/test/java/software/amazon/awssdk/http/SdkHttpRequestResponseTest.java

@@ -412,6 +412,16 @@ public void testSdkHttpFullRequestBuilderUriWithQueryParamWithoutValue() {
         assertThat(actual.getUri()).hasToString(expected);
     }
 
+    @Test
+    public void testSdkHttpFullRequestBuilderUriWithQueryParamWithoutValueWithEqual() {
+        final String original = "https://github.com/aws/aws-sdk-for-java-v2?foo=";
+        final String expected = "https://github.com/aws/aws-sdk-for-java-v2?foo";
+        URI myUri = URI.create(original);
+
+        SdkHttpRequest actual = SdkHttpRequest.builder().method(SdkHttpMethod.POST).uri(myUri).build();
+        assertThat(actual.getUri()).hasToString(expected);
+    }
+
     @Test
     public void testSdkHttpRequestBuilderNoQueryParams() {
         URI uri = URI.create("https://github.com/aws/aws-sdk-java-v2/issues/2034");
@@ -444,6 +454,16 @@ public void testSdkHttpRequestBuilderUriWithQueryParamWithoutValue() {
         assertThat(actual.getUri()).hasToString(expected);
     }
 
+    @Test
+    public void testSdkHttpRequestWithSingleEqualQuery() {
+        final String original = "http://example.com?=";
+        final String expected = "http://example.com?";
+        URI myUri = URI.create(original);
+
+        SdkHttpRequest actual = SdkHttpRequest.builder().method(SdkHttpMethod.POST).uri(myUri).build();
+        assertThat(actual.getUri()).hasToString(expected);
+    }
+
     private interface BuilderProxy {
         BuilderProxy setValue(String key, String value);
 

utils/src/main/java/software/amazon/awssdk/utils/http/SdkHttpUtils.java

@@ -405,6 +405,7 @@ public static Map<String, List<String>> uriParams(URI uri) {
         return splitQueryString(uri.getRawQuery())
             .stream()
             .map(s -> s.split("="))
+            .map(s -> s.length == 0 ? new String[] {""} : s)
             .map(s -> s.length == 1 ? new String[] { s[0], null } : s)
             .collect(groupingBy(a -> urlDecode(a[0]), mapping(a -> urlDecode(a[1]), toList())));
     }

utils/src/test/java/software/amazon/awssdk/utils/SdkHttpUtilsTest.java

@@ -238,6 +238,36 @@ public void uriParams() throws URISyntaxException {
                                        entry("decoded&Part", Arrays.asList("equals=val")));
     }
 
+    @Test
+    void uriParamsWithSingleEqualQuery()  {
+        URI uri = URI.create("http://example.com?=");
+        Map<String, List<String>> uriParams = SdkHttpUtils.uriParams(uri);
+        assertThat(uriParams).containsKey("");
+        assertThat(uriParams.get(""))
+            .isNotNull()
+            .hasSize(1)
+            .containsNull();
+    }
+    @Test
+    void uriParamsWithSingleEqualWithValueQuery()  {
+        URI uri = URI.create("http://example.com?=nokeyvalue");
+        Map<String, List<String>> uriParams = SdkHttpUtils.uriParams(uri);
+        assertThat(uriParams).containsKey("");
+        assertThat(uriParams.get(""))
+            .isNotNull()
+            .hasSize(1)
+            .contains("nokeyvalue");
+    }
+    @Test
+    void uriParamsWithWithEmptyValueQuery()  {
+        URI uri = URI.create("http://example.com?novaluekey=");
+        Map<String, List<String>> uriParams = SdkHttpUtils.uriParams(uri);
+        assertThat(uriParams).containsKey("novaluekey");
+        assertThat(uriParams.get("novaluekey"))
+            .hasSize(1)
+            .containsNull();
+    }
+
     @Test
     void parseSingleNonProxyHost(){
         String singleHostName = "singleHost" ;