mod_json_streams/strophe.jsonstreams.js
author Matthew Wild <mwild1@gmail.com>
Tue, 18 Jan 2022 17:01:18 +0000
changeset 4880 0f5f2d4475b9
parent 1343 7dbde05b48a9
permissions -rw-r--r--
mod_http_xep227: Add support for import via APIs rather than direct store manipulation In particular this transitions PEP nodes and data to be imported via mod_pep's APIs, fixing issues with importing at runtime while PEP data may already be live in RAM. Next obvious candidate for this approach is rosters, so clients get immediate roster pushes and other special handling (such as emitting subscribes to reach the desired subscription state).
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/* jsonstreams plugin
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**
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** This plugin upgrades Strophe to support XEP-0295: JSON Encodings for XMPP
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**
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*/
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Strophe.addConnectionPlugin('jsonstreams', {
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    init: function (conn) {
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        var parseXMLString = function(xmlStr) {
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			var xmlDoc = null;
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			if (window.ActiveXObject) {
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				xmlDoc = new ActiveXObject("Microsoft.XMLDOM");
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				xmlDoc.async=false;
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				xmlDoc.loadXML(xmlStr);
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			} else {
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				var parser = new DOMParser();
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				xmlDoc = parser.parseFromString(xmlStr, "text/xml");
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			}
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			return xmlDoc;
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        }
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        // replace Strophe.Request._newXHR with new jsonstreams version
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        // if JSON is detected
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        if (window.JSON) {
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        	var _newXHR = Strophe.Request.prototype._newXHR;
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            Strophe.Request.prototype._newXHR = function () {
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            	var _xhr = _newXHR.apply(this, arguments);
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                var xhr = {
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                	readyState: 0,
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                	responseText: null,
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                	responseXML: null,
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                	status: null,
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                	open: function(a, b, c) { return _xhr.open(a, b, c) },
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                	abort: function() { _xhr.abort(); },
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                	send: function(data) {
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                		data = JSON.stringify({"s":data});
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                		return _xhr.send(data);
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                	}
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                };
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                var req = this;
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                xhr.onreadystatechange = this.func.bind(null, this);
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                _xhr.onreadystatechange = function() {
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                	xhr.readyState = _xhr.readyState;
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                	if (xhr.readyState != 4) {
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                		xhr.status = 0;
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                		xhr.responseText = "";
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                		xhr.responseXML = null;
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                	} else {
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	                	xhr.status = _xhr.status;
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	               		xhr.responseText = _xhr.responseText;
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	               		xhr.responseXML = _xhr.responseXML;
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	                	if (_xhr.responseText && !(_xhr.responseXML
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	                			&& _xhr.responseXML.documentElement
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	                			&& _xhr.responseXML.documentElement.tagName != "parsererror")) {
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	                		var data = JSON.parse(_xhr.responseText);
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	                		if (data && data.s) {
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	                			xhr.responseText = data.s;
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	                			xhr.responseXML = parseXMLString(data.s);
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	                		}
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	                	}
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	                }
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                	if ("function" == typeof xhr.onreadystatechange) { xhr.onreadystatechange(req); }
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                }
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                return xhr;
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            };
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        } else {
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            Strophe.error("jsonstreams plugin loaded, but JSON not found." +
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                          "  Falling back to native XHR implementation.");
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        }
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    }
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});