From cbc0e21926594cbe650db34c466b934fda5c13ef Mon Sep 17 00:00:00 2001
From: Sreejumon <spurayil@imprivata.com>
Date: Tue, 1 Mar 2016 09:35:14 -0800
Subject: [PATCH] Support for XHR responseType and response attributes

Summary:Currently the XMLHttpRequest don't support any response types other than text. This PR will add responseType attribute as well response attribute.

This PR will partially solve the issue https://github.com/facebook/react-native/issues/6017
Closes https://github.com/facebook/react-native/pull/6156

Differential Revision: D2994267

Pulled By: nicklockwood

fb-gh-sync-id: 24642c48655930c8350112bac38e6ed4a42bd40d
shipit-source-id: 24642c48655930c8350112bac38e6ed4a42bd40d
---
 Libraries/Network/XMLHttpRequestBase.js | 33 +++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/Libraries/Network/XMLHttpRequestBase.js b/Libraries/Network/XMLHttpRequestBase.js
index 14e284ae5..96d2ec1d2 100644
--- a/Libraries/Network/XMLHttpRequestBase.js
+++ b/Libraries/Network/XMLHttpRequestBase.js
@@ -43,6 +43,8 @@ class XMLHttpRequestBase {
   readyState: number;
   responseHeaders: ?Object;
   responseText: ?string;
+  response: string | ArrayBuffer | null;
+  responseType: '' | 'arraybuffer' | 'text';
   status: number;
   timeout: number;
   responseURL: ?string;
@@ -83,6 +85,8 @@ class XMLHttpRequestBase {
     this.readyState = this.UNSENT;
     this.responseHeaders = undefined;
     this.responseText = '';
+    this.response = null;
+    this.responseType = '';
     this.status = 0;
     delete this.responseURL;
 
@@ -139,6 +143,15 @@ class XMLHttpRequestBase {
     }
   }
 
+  _stringToArrayBuffer(str: string): ArrayBuffer {
+    var buffer = new ArrayBuffer(str.length);
+    var bufferView = new Uint8Array(buffer);
+    for (var i = 0, l = str.length; i < l; i++) {
+      bufferView[i] = str.charCodeAt(i);
+    }
+    return buffer;
+  }
+
   _didReceiveData(requestId: number, responseText: string): void {
     if (requestId === this._requestId) {
       if (!this.responseText) {
@@ -146,6 +159,17 @@ class XMLHttpRequestBase {
       } else {
         this.responseText += responseText;
       }
+      switch(this.responseType) {
+      case '':
+      case 'text':
+        this.response = this.responseText;
+        break;
+      case 'arraybuffer': // NOTE: not supported by fetch
+        this.response = this._stringToArrayBuffer(this.responseText);
+        break;
+      default: //TODO: Support the other response type as well (eg:- document, json, blob)
+        this.response = null;
+      }
       this.setReadyState(this.LOADING);
     }
   }
@@ -214,6 +238,12 @@ class XMLHttpRequestBase {
     throw new Error('Subclass must define sendImpl method');
   }
 
+  _uintToString(uintArray: Int8Array): string {
+    // $FlowFixMe - Function.apply accepts Int8Array, but Flow thinks it doesn't
+    var encodedString = String.fromCharCode.apply(null, uintArray);
+    return decodeURIComponent(encodedString);
+  }
+
   send(data: any): void {
     if (this.readyState !== this.OPENED) {
       throw new Error('Request has not been opened');
@@ -222,6 +252,9 @@ class XMLHttpRequestBase {
       throw new Error('Request has already been sent');
     }
     this._sent = true;
+    if (data instanceof Int8Array) {
+      data = this._uintToString(data);
+    }
     this.sendImpl(this._method, this._url, this._headers, data, this.timeout);
   }