com.google.apphosting.utils.servlet.js.webhook.js Maven / Gradle / Ivy
/**
Copyright 2021 Google LLC
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
https://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
function Webhook(formId) {
this.formId = formId;
this.action = null;
this.headers = {};
this.method = null;
this.payload = null;
};
Webhook.prototype.HEADER_KEY = 'header:';
Webhook.prototype.parse = function() {
var form = document.getElementById(this.formId);
if (form == null) {
return 'could not find form with id "' + this.formId + '"';
}
this.action = form.action;
this.method = form.method;
for (var i = 0, n = form.elements.length; i < n; i++) {
var currentElement = form.elements[i];
if (currentElement.tagName != 'INPUT' ||
currentElement.type.toUpperCase() != 'HIDDEN') {
continue;
}
var key = currentElement.name;
var value = currentElement.value;
var headerIndex = key.indexOf(this.HEADER_KEY);
if (headerIndex == 0) {
var header = key.substr(this.HEADER_KEY.length);
if (this.headers[header] === undefined) {
this.headers[header] = [value];
} else {
this.headers[header].push(value);
}
} else if (key == 'payload') {
this.payload = value;
}
}
if (this.action == '') {
return 'action not found';
}
if (this.method == '') {
return 'method not found';
}
return '';
};
Webhook.prototype.send = function(callback) {
var req = null;
if (window.XMLHttpRequest) {
req = new XMLHttpRequest();
} else if (window.ActiveXObject) {
req = new ActiveXObject('MSXML2.XMLHTTP.3.0');
}
try {
req.open(this.method, this.action, false);
for (var key in this.headers) {
// According to the W3C, multiple calls to setRequestHeader should result
// in a single header with comma-seperated values being set (see
// http://www.w3.org/TR/2009/WD-XMLHttpRequest-20090820/). Unfortunately,
// both FireFox 3 and Konqueror 3.5 set the header value to the value in
// the last call to setRequestHeader so the joined header is generated
// manually. The equivalence of headers with comma-separated values and
// repeated headers is described here:
// http://www.w3.org/Protocols/rfc2616/rfc2616-sec4.html#sec4.2
req.setRequestHeader(key, this.headers[key].join(', '));
}
req.send(this.payload);
} catch (e) {
callback(this, req, e);
return;
}
// If the responseText matches our