How to Add Disclaimer using Costom Action using CSOM [C#]

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using Microsoft.SharePoint.Client;

using System.Text;

using System.Net;



namespace DisclaimerWeb

{

    public class DisclaimerCustomAction

    {

        private ClientContext context;

        private Site siteCollection;

        private string disclaimerFileLocation = string.Empty;

        private string disclaimerFileName = "DisclaimerScript.js";

        private string SiteCollectionUrl = string.Empty;

        private string jQueryFileName = "jquery-1.7.2.min.js";





        public string Message { get;private set; }



        public DisclaimerCustomAction(ClientContext ctx, string siteCollectionUrl)

        {

            this.context = ctx;

            this.SiteCollectionUrl = siteCollectionUrl;

        }

        /// <summary>

        /// Download file from sysconfig site and Upload it to style Library.

        /// </summary>

        /// <returns></returns>

        public bool Upload()

        {

            bool returnVal = false;

            string ServerRelativeUrl=string.Empty;

            try

            {

                siteCollection = context.Site;

                var listCol = context.LoadQuery(siteCollection.RootWeb.Lists.Where(lists => lists.Title == "Style Library"));





                context.Load(siteCollection, sc => sc.RootWeb.ServerRelativeUrl);

                context.ExecuteQuery();

                ServerRelativeUrl = siteCollection.RootWeb.ServerRelativeUrl;

                List styleLib = listCol.FirstOrDefault();

                if (styleLib != null)

                {

                    File disclaimerJSFile = siteCollection.RootWeb.GetFileByServerRelativeUrl(string.Format("{0}/Style Library/{1}",ServerRelativeUrl.TrimEnd('/'), disclaimerFileName));

                    File JqueryFile = siteCollection.RootWeb.GetFileByServerRelativeUrl(string.Format("{0}/Style Library/{1}",ServerRelativeUrl.TrimEnd('/'), jQueryFileName));

                    context.Load(disclaimerJSFile, f => f.CheckOutType, f => f.Exists);



                    try

                    {

                        context.ExecuteQuery();

                        if (disclaimerJSFile.Exists && disclaimerJSFile.CheckOutType == CheckOutType.None)

                        {

                            disclaimerJSFile.CheckOut();

                            context.ExecuteQuery();

                            Message += "File is CheckedOut :" + ServerRelativeUrl;

                        }

                    }

                    catch (ServerException e)

                    {



                        if (e.ServerErrorTypeName != "System.IO.FileNotFoundException")

                        {

                            Message += e.Message;

                            return returnVal;

                        }

                    }

                    context.Load(JqueryFile, jf => jf.Exists);

                    context.ExecuteQuery();

                    if (!JqueryFile.Exists)

                    {

                        var Jquerycontent = DownloadFile(BuildUrlforDownlaod(SiteCollectionUrl, jQueryFileName));



                        JqueryFile = styleLib.RootFolder.Files.Add(new FileCreationInformation()

                        {

                            Content = Encoding.UTF8.GetBytes(Jquerycontent),

                            Url = jQueryFileName,

                            Overwrite = true

                        });

                        JqueryFile.CheckIn(string.Empty, CheckinType.MajorCheckIn);

                    }



                    var filecontent = DownloadFile(BuildUrlforDownlaod(SiteCollectionUrl, disclaimerFileName));



                    disclaimerJSFile = styleLib.RootFolder.Files.Add(new FileCreationInformation()

                    {

                        Content = Encoding.UTF8.GetBytes(filecontent),

                        Url = disclaimerFileName,

                        Overwrite = true

                    });

                    disclaimerJSFile.CheckIn(string.Empty, CheckinType.MajorCheckIn);

                    context.ExecuteQuery();

                    Message += "File Uploaded to Style Library";

                    returnVal = true;

                }

                else

                {

                    Message += "Style Library Not Found .";

                    return returnVal;

                }

            }

            catch (Exception e)

            {



                Message += e.Message;

                return returnVal;

            }



            return returnVal;

        }

        /// <summary>

        /// Download file from Sysconfig StyleLibrary.

        /// </summary>

        /// <param name="url"></param>

        /// <returns></returns>

        private string DownloadFile(string url)

        {

            string returnFile = string.Empty;

            HttpWebRequest request = HttpWebRequest.Create(url) as HttpWebRequest;

            request.Credentials = CredentialCache.DefaultNetworkCredentials;

            using (var sr = new System.IO.StreamReader(request.GetResponse().GetResponseStream()))

            {

                returnFile = sr.ReadToEnd();

            }

            return returnFile;

        }

        /// <summary>

        /// Create CustomAction on SiteCollection

        /// </summary>

        public void CreateCustomAction()

        {

            UserCustomAction JqueryCA = context.Site.UserCustomActions.Add();

            JqueryCA.Location = "ScriptLink";

            JqueryCA.ScriptSrc = string.Format("~SiteCollection/Style Library/jquery-1.7.2.min.js");

            JqueryCA.Sequence = 1000;

            JqueryCA.Name = "JQuery";

            JqueryCA.Update();

            context.ExecuteQuery();

            UserCustomAction DisclaimerCA = context.Site.UserCustomActions.Add();

            DisclaimerCA.Location = "ScriptLink";

            DisclaimerCA.ScriptSrc = string.Format("~SiteCollection/Style Library/{0}",disclaimerFileName);

            DisclaimerCA.Name = "DisclaimerCustomAction";

            DisclaimerCA.Sequence = 1001;

            DisclaimerCA.Update();

            context.ExecuteQuery();

            Message += "Disclaimer Added Successfully";

        }



        private string BuildUrlforDownlaod(string url,string fileName)

        {

            url = url.TrimEnd('/');

            string splitSiteName = url.Substring(0, url.LastIndexOf('/'));

            string styleLibary = "/sysconfigsettings/Style%20Library/";

            return splitSiteName + styleLibary + fileName;

        }



    }

}