refactor PayPro tests

js/util/HTTP.js

@@ -0,0 +1,75 @@
+module.exports = {
+  request: function(options, callback) {
+    preconditions.checkArgument(_.isObject(options));
+
+    options.method = options.method || 'GET';
+    options.headers = options.headers || {};
+    var ret = {
+      success: function(cb) {
+        this._success = cb;
+        return this;
+      },
+      error: function(cb) {
+        this._error = cb;
+        return this;
+      },
+      _success: function() {;
+      },
+      _error: function(_, err) {
+        throw err;
+      }
+    };
+
+    var method = (options.method || 'GET').toUpperCase();
+    var url = options.url;
+    var req = options;
+
+    req.headers = req.headers || {};
+    req.body = req.body || req.data || {};
+
+    var xhr = new XMLHttpRequest();
+    xhr.open(method, url, true);
+
+    Object.keys(req.headers).forEach(function(key) {
+      var val = req.headers[key];
+      if (key === 'Content-Length') return;
+      if (key === 'Content-Transfer-Encoding') return;
+      xhr.setRequestHeader(key, val);
+    });
+
+    if (req.responseType) {
+      xhr.responseType = req.responseType;
+    }
+
+    xhr.onload = function(event) {
+      var response = xhr.response;
+      var buf = new Uint8Array(response);
+      var headers = {};
+      (xhr.getAllResponseHeaders() || '').replace(
+        /(?:\r?\n|^)([^:\r\n]+): *([^\r\n]+)/g,
+        function($0, $1, $2) {
+          headers[$1.toLowerCase()] = $2;
+        }
+      );
+      return ret._success(buf, xhr.status, headers, options);
+    };
+
+    xhr.onerror = function(event) {
+      var status;
+      if (xhr.status === 0 || !xhr.statusText) {
+        status = 'HTTP Request Error: This endpoint likely does not support cross-origin requests.';
+      } else {
+        status = xhr.statusText;
+      }
+      return ret._error(null, status, null, options);
+    };
+
+    if (req.body) {
+      xhr.send(req.body);
+    } else {
+      xhr.send(null);
+    }
+
+    return ret;
+  },
+};