feat: allow modifying BoxAPIRequest URL (#1236)

Closes: SDK-3638

Author: lukaszsocha2

src/main/java/com/box/sdk/BoxAPIRequest.java

@@ -49,7 +49,7 @@ public class BoxAPIRequest {
     private final BoxAPIConnection api;
     private final List<RequestHeader> headers;
     private final String method;
-    private final URL url;
+    private URL url;
     private BackoffCounter backoffCounter;
     private int connectTimeout;
     private int readTimeout;
@@ -291,6 +291,14 @@ public URL getUrl() {
         return this.url;
     }
 
+    /**
+     * Sets the URL to the request.
+     *
+     */
+    public void setUrl(URL url) {
+        this.url = url;
+    }
+
     /**
      * Gets the http method from the request.
      *

src/test/java/com/box/sdk/BoxAPIRequestTest.java

@@ -287,6 +287,27 @@ public void interceptorCanModifyRequest() {
         verify(1, getRequestedFor(urlEqualTo("/")));
     }
 
+    @Test
+    public void interceptorCanModifyRequestURL() {
+        String initialPath = "/";
+        String modifiedPath = "/2";
+
+        stubFor(get(urlEqualTo(initialPath))
+                .willReturn(aResponse().withStatus(404)));
+        stubFor(get(urlEqualTo(modifiedPath))
+                .willReturn(aResponse().withStatus(200).withBody("{\"foo\":\"bar\"}")));
+
+        BoxAPIConnection api = createConnectionWith(boxMockUrl().toString());
+        api.setRequestInterceptor(request -> {
+            request.setUrl(boxMockUrl(modifiedPath));
+            return null;
+        });
+
+        new BoxAPIRequest(api, boxMockUrl(), "GET").send();
+        verify(1, getRequestedFor(urlEqualTo(modifiedPath)));
+        verify(0, getRequestedFor(urlEqualTo(initialPath)));
+    }
+
     @Test
     public void addsAuthenticationHeaderByDefault() {
         stubFor(get(urlEqualTo("/"))
@@ -334,4 +355,12 @@ private URL boxMockUrl() {
             throw new RuntimeException(e);
         }
     }
+
+    private URL boxMockUrl(String path) {
+        try {
+            return new URL(format("https://localhost:%d%s", wireMockRule.httpsPort(), path));
+        } catch (MalformedURLException e) {
+            throw new RuntimeException(e);
+        }
+    }
 }