Check for document lock and release the lock

UnlockFile..html

<div id="locked-doc">

<p>
	<label>Document URL</label>
	<br/>
	<input id="docUrl" type="text" value="http://" style="width:500px" />
</p>
<p>
	<label>Website URL</label>
	<br/>
	<input id="webUrl" type="text" value="http://" style="width:500px" />
</p>

<p>
	<input type="button" value="UNLOCK" onclick="getLockForDoc();" />
</p>

</div>

<script>

//https://pholpar.wordpress.com/2014/04/07/how-to-use-javascript-to-delete-short-term-locks-from-documents-opened-from-sharepoint
//https://sharepoint.stackexchange.com/questions/165970/can-we-unlock-a-shortterm-lock-via-csom-for-sp2013

/*
Unlock document lock through javascript

USAGE:
UnlockFile.aspx?docUrl=http://contoso.com/lib/test.docx&webUrl=http://contoso.com
or
UnlockFile.aspx

*/

//get a parameter from querystring by its name, empty if fails
function getParameterByName(name) {
    name = name.replace(/[\[]/, "\\\[").replace(/[\]]/, "\\\]");
    var regex = new RegExp("[\\?&]" + name + "=([^&#]*)"),
        results = regex.exec(location.search);
    return results == null ? "" : decodeURIComponent(results[1].replace(/\+/g, " "));
}

// define String.format function
if (!String.prototype.format) {
    String.prototype.format = function () {
        var args = arguments;
        return this.replace(/{(\d+)}/g, function (match, number) {
            return typeof args[number] != 'undefined'
              ? args[number]
              : match
            ;
        });
    };
}


function Properties(source) {
    this.source = source;
    this.offspring = [];
 
    this.getPropValue = function (propName) {
        var propValue = "";
        var propNameFullLine = '<li>' + propName + '\n';
        var startPos = this.source.indexOf(propNameFullLine);
        if (startPos > -1) {
            var endPos = this.source.substr(startPos + propNameFullLine.length).indexOf('\n');
            if (endPos > 0) {
                propValue = this.source.substr(startPos + propNameFullLine.length, endPos);
                // trim leading chars
                // http://msdn.microsoft.com/en-us/library/office/ms460937(v=office.14).aspx
                var strDummy = '<li>SW|';
                propValue = unescapeEx(propValue.substr(strDummy.length));
            }
        }
 
        return propValue;
    }
 
    // this function is intended to be accessible from the object itself (e.g. private)
    var unescapeEx = function (value) {
        var result = value.replace(/&#([0-9]|[1-9][0-9]|[[01][0-9][0-9]|2[0-4][0-9]|25[0-5]);/g, function (str, match) { return String.fromCharCode(match); });
 
        return result;
    }
}



function getLockForDoc() {
 	
	var docUrl = $("#docUrl").val();
	var webUrl = $("#webUrl").val();
	
	if(docUrl === "" || webUrl === "")
	{
		alert("Invalid parameters!");
		return;
	}
	
    var escapedDocUrl = encodeURI(docUrl);
 
    $.ajax({
        url: webUrl + '/_vti_bin/_vti_aut/author.dll',
        type: 'POST',
        contentType: 'application/x-www-form-urlencoded',
        headers: {
            'MIME-Version': '1.0',
            'User-Agent': 'MSFrontPage/14.0',
            'Accept': 'auth/sicily',
            'X-Vermeer-Content-Type': 'application/x-www-form-urlencoded'
        },
        data: 'method=getDocsMetaInfo%3a14%2e0%2e0%2e6009&url%5flist=%5b' + escapedDocUrl + '%5d&listHiddenDocs=false&listLinkInfo=false',
        complete: function (result) {
            if ((result.readyState == 4) && (result.status == 200)) {
                var rawResponse = result.responseText;
                var startPos = rawResponse.indexOf('<li>meta_info=\n<ul>');
                if (startPos > 0) {
                    var endPos = rawResponse.substr(startPos).indexOf('</ul>');
                    if (endPos > 0) {
                        var props = new Properties(rawResponse.substr(startPos, endPos));
                        var lockId = props.getPropValue('vti_sourcecontrollockid');
                        var checkedOutBy = props.getPropValue('vti_sourcecontrolcheckedoutby');
                        var lockExpires = props.getPropValue('vti_sourcecontrollockexpires');
                        if (lockId == "") {
                            alert("File is not locked.");
                        }
                        else {
                            if (confirm(String.format("File is locked by '{0}' until '{1}', LockId = '{2}'.\r\nUnlocking the file can cause problems if the user is still editing the file and would like to save it later.\r\nDo you want to clear the lock?", checkedOutBy, lockExpires, lockId))) {
                                releaseLock(escapedDocUrl, lockId);
                            }
                        }
                    }
                }
            }
        }
    });
}



// message template to unlock a document
var releseLockReq = '\r\n';
releseLockReq += '–urn:uuid:8cfcbb22-dd52-4889-b29d-9ff2dcf909b2\r\n';
releseLockReq += 'Content-ID: <f13ad06d-8530-4af1-8cf3-d6d75c1635d4@tempuri.org>\r\n';
releseLockReq += 'Content-Transfer-Encoding: 8bit\r\n';
releseLockReq += 'Content-Type: application/xop+xml;charset=utf-8;type="text/xml; charset=utf-8"\r\n';
releseLockReq += '\r\n';
releseLockReq += '<s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/"><s:Body><RequestVersion Version="2" MinorVersion="0" xmlns="http://schemas.microsoft.com/sharepoint/soap/"/><RequestCollection CorrelationId="{35E42C96-FE02-41FE-B4D8-F7DEC43AF784}" xmlns="http://schemas.microsoft.com/sharepoint/soap/"><Request Url="{0}" RequestToken="1"><SubRequest Type="ExclusiveLock" SubRequestToken="1"><SubRequestData ExclusiveLockRequestType="ReleaseLock" ExclusiveLockID="{1}"/></SubRequest></Request></RequestCollection></s:Body></s:Envelope>\r\n';
releseLockReq += '–urn:uuid:8cfcbb22-dd52-4889-b29d-9ff2dcf909b2–\r\n';
 
function releaseLock(escapedDocUrl, lockId) {
    $.ajax({
        url: webUrl + '/_vti_bin/cellstorage.svc/CellStorageService',
        type: 'POST',
        contentType: 'multipart/related; type="application/xop+xml"; boundary="urn:uuid:8cfcbb22-dd52-4889-b29d-9ff2dcf909b2"; start="<f13ad06d-8530-4af1-8cf3-d6d75c1635d4@tempuri.org>"; start-Info="text/xml; charset=utf-8"',
        headers: {
            'MIME-Version': '1.0',
            'User-Agent': 'Microsoft Office Upload Center 2010 (14.0.6124) Windows NT 6.1',
            'SOAPAction': 'http://schemas.microsoft.com/sharepoint/soap/ICellStorages/ExecuteCellStorageRequest'
        },
        data: String.format(releseLockReq, escapedDocUrl, lockId),
        complete: function (result) {
            var succeeded = false;
            if ((result.readyState == 4) && (result.status == 200)) {
                var rawResponse = result.responseText;
                // check the result the primitive way
                succeeded = (rawResponse.indexOf('ErrorCode="Success"') > -1);
            }
            if (succeeded) {
                alert('Lock is released.');
            } else {
                alert('An error has occured during the request. Lock is not released, try again later.');
            }
        }
    });
}

//lets work
var webUrl = getParameterByName("webUrl");
if(webUrl !== "")
	$("#webUrl").val(webUrl);
	
var docUrl = getParameterByName("docUrl");
if(docUrl !== "")
	$("#docUrl").val(docUrl);
	


</script>