Snippet of code to create a full XML backup of messages from Pulse Messenger

Pulse_SMSBackup.js

/*!
 *
 * Snippet of code to create a full XML backup of messages from Pulse Messenger
 * https://github.com/klinker-apps/messenger-desktop
 *
 * This code utilizes the webapp's core functions.
 *
 * Instructions
 * 1. Log into https://messenger.klinkerapps.com
 * 2. Wait for the UI to load your conversations
 * 3. Open Developer Console
 * 4. Paste the following code
 * 5. Wait for your data to download(check Network tab)
 * 6. Download SMSBackupRestore from PlayStore (https://play.google.com/store/apps/details?id=com.riteshsahu.SMSBackupRestore)
 * 7. Put backup XML file to SD Card
 * 8. Restore using SMSBackupRestore
 *
 * profit 5 cents
 *
 * Changelog:
 * 06 MAY 2018: Changed to multi-query per conversation thread to reduce server load & support slow connections
 *              --> Set custom limit per query @ line 150, default is 20
 *              Added a bit of log output to console
 *
**/


$(function() {
	
	String.prototype.toHtmlEntities = function() {
		// https://stackoverflow.com/a/4237934
		// https://stackoverflow.com/a/27020300
		// https://stackoverflow.com/a/32712035
		var str = this;
		if ($.trim(str) != "") {
			str = str.replace(/</g, "&lt;").replace(/>/g, "&gt;").replace(/"/g, "&quot;").replace(/'/g, "&#39;");
			str = str.replace(/&(?!(amp;)|(lt;)|(gt;)|(quot;)|(#39;)|(apos;))/g, "&amp;");
			str = str.replace(/([^\\])((\\\\)*)\\(?![\\/{])/g, "$1\\\\$2");  //replaces odd backslash(\\) with even.
		}
		return str.replace(/[^\u0009|\u0020-\uD7FF|\uE000-\uFFFD|\uDBFFDFFF-\u10FFFF]/gim, function(s) {
			return "&#" + s.charCodeAt(0) + ";";
		});
	};

	// modified version for xml export
	// only decrypts .data
	// does not convert emojis to web emojis
	// converts non-xml-safe chars
	function decryptMessages_forExport(data) {
		for (var i = data.length - 1; i >= 0; i--) {
				try {
					data[i].data = entityEncode(decrypt(data[i].data));
					data[i].data = data[i].data.toHtmlEntities();
				} catch (err) {
					data[i].data = "";
				}
		}

		// remove duplicate messages
		for (var i = 0; i < data.length; i++) {
				var currentId = data[i].device_id;
				for (var j = i + 1; j < data.length; j++) {
						if (data[j].device_id == currentId) {
								data.splice(j, 1);
								j--;
						}
				}
		}

		return data;
	}

	function export_to_xml(data) {
		/*
		* data needed for SMSBackupRestore
		* protocol="0"
		* address=
		* date=
		* type=1(received)/2(sent)
		* subject="null"
		* body=
		* toa="null"
		* sc_toa="null"
		* service_center=""
		* read="1"
		* status="-1"
		* locked="0"
		* date_sent=
		* readable_date="Jun 4, 2017 23:40:11"
		* contact_name=
		*/
		// xml headers
		var xml_string = "";
		xml_string += "<?xml version='1.0' encoding='UTF-8' standalone='yes' ?>\n";
		xml_string += '<?xml-stylesheet type="text/xsl" href="sms.xsl"?>\n';
		var msg_string = "";
		var msg_count = 0;
		// loop through each conversation thread
		for(var i=0, d, m, n, f; i < data.length; i++) {
			d = data[i];
			f = d.name;
			n = d.number;
			t = d.messages;
			// loop through each message
			for(var j=0, m; j<t.length; j++) {
				m = t[j];
				msg_string += '<sms';
				msg_string += ' protocol="0"';
				msg_string += ' address="' + n + '"';
				msg_string += ' date="' + m.timestamp + '"';
				msg_string += ' type="' + (m.message_type+1) + '"';
				msg_string += ' subject="null"';
				msg_string += ' body="' + m.data + '"';
				msg_string += ' toa="null"';
				msg_string += ' sc_toa="null"';
				msg_string += ' service_center=""';
				msg_string += ' read="1"';
				msg_string += ' status="-1"';
				msg_string += ' locked="0"';
				msg_string += ' date_sent="' + m.timestamp + '"';
				msg_string += ' readable_date=""';
				msg_string += ' contact_name="' + n + '"';
				msg_string += '/>\n';
			}
			msg_count += t.length;
		}
		xml_string += '<smses count="' + msg_count + '" backup_date="' + new Date().getTime() + '">\n';
		xml_string += msg_string;
		xml_string += '</smses>';
		
		// export to sms
		var download = document.createElement("a");
		download.setAttribute('href', 'data:text/csv;charset=utf-8,' + encodeURIComponent(xml_string));
		download.setAttribute('download', 'backup-' + new Date().getTime() + '.xml');
		$("body").append(download);
		download.click();
		
	}

	url="https://api.messenger.klinkerapps.com/api/v1/conversations/index_unarchived?account_id=" + accountId;
	var messages=[];
	var convo_list;
	var fetched=0;
	$.get(url).done(function(data) {
		convo_list = decryptConversations(data);
		console.log("Fetching " + convo_list.length + " conversation threads...");
		for(var i=0; i<convo_list.length; i++) {
			(function(q, z) { // save val of i to q
				var t = "https://api.messenger.klinkerapps.com/api/v1/messages?web=true&account_id=" + accountId + "&conversation_id=" + q.device_id + "";
				var l = 20, o = 0; // limit, offset
				var ret = function() {
					t += "&limit=" + l + "&offset=" + o;
					$.get(t).done(function(data) {
						if(data.length <= 0) {
							// no more messages
							// mark whole thread as fetched
							console.log(" --> fetched thread #" + z);
							fetched++;
							if(fetched >= convo_list.length) {
								console.log("Exporting to XML, please check download progress.");
								export_to_xml(messages);
							}
						} else {
							// decrypt and save messages
							messages.push({
								number: q.phone_numbers,
								name: q.title,
								messages: decryptMessages_forExport(data)
							});
							// get next offset
							o += l;
							setTimeout(ret, 200);
						}
					});
				};
				console.log(" --> fetching thread #" + z);
				ret();
			})(convo_list[i], i + 1);
		}
	});
	
});

You should probably paginate the messages query. That /messages route will accept a limit and offset query parameter. I recommend a limit of 500, or less, messages per query, just to keep the load a bit lower. The endpoint will time out after 30 seconds.

Modified the code to paginate the query per thread and hopefully reduce the load. Thanks for the suggestion 👍

Getting an error
}' is not a valid selector

Does this snippet no longer work? Chrome just says "undefined" when ran in the console.