I'm trying to use the Reputation.js setLike method in a sharepoint hosted app/add-in which in theory is possible with the following snippet:

var ctx = new SP.ClientContext(webAppUrl);
Microsoft.Office.Server.ReputationModel.Reputation.setLike(ctx, "73eaae6a-9839-43bd-b509-ddc64989536a", "40", true);
    Function.createDelegate(this, function () {
        alert("Everything OK!");
    //Failed to execute, log this in console.
    Function.createDelegate(this, function (e, args) {
        alert("Failed! " + args.get_message());

As a result I get an alert with "The assembly Microsoft.SharePoint.Portal.Proxy, Version=, Culture=neutral, PublicKeyToken=71e9bce111e9429c does not support app authentication."

Is it not possible to Like/Unlike through JSOM? Any pointers or other ways to do this in an app?


At last I managed to solve my problem by creating and use a custom WCF service to call the Reputation.SetLike method. Not really the way I would have preferred but in lack of alternatives it was the fastest way forward.


interface IProxyService
        UriTemplate = "LikeArticle?url={url}&listid={listid}&listitemid={listitemid}&like={like}",
        ResponseFormat = WebMessageFormat.Json,
        BodyStyle = WebMessageBodyStyle.Bare)]
    String LikeArticle(string url, string listid, int listitemid, bool like);


public String LikeArticle(string url, string listid, int listitemid, bool like)
        int likes = -1;
        using (var site = new SPSite(url)) {
            using (var web = site.OpenWeb())
                using (new SPContextFaker(HttpContext.Current, SPContext.GetContext(web)))
                    likes = Reputation.SetLike(listid, listitemid, like);

        return ""+likes;


public class SPContextFaker : IDisposable
    private SPContext _oldSPContext;
    private HttpContext httpContext;
    public SPContextFaker(HttpContext context, SPContext newSPContext)
        _oldSPContext = (SPContext)context.Items["DefaultSPContext"];
        context.Items["DefaultSPContext"] = newSPContext;
        httpContext = context;
    public void Dispose()
        httpContext.Items["DefaultSPContext"] = _oldSPContext;

I merged the following two resources in order to create the solution above:

Programmatically like a blog post with Reputation.SetLike Sharepoint 2013

SharePoint 2013: Create a Custom WCF REST Service Hosted in SharePoint and Deployed in a WSP

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