/Web/Controls/MetaContent.ascx.cs

/// Author:				    Joe Audette

/// Created:			    2004-08-28

///		

/// 

/// The use and distribution terms for this software are covered by the 

/// Common Public License 1.0 (http://opensource.org/licenses/cpl.php)

/// which can be found in the file CPL.TXT at the root of this distribution.

/// By using this software in any fashion, you are agreeing to be bound by 

/// the terms of this license.

///

/// You must not remove this notice, or any other, from this software.	

/// 

///	2005-09-24 added RSS link feature provided by Philip Gear

///		for enhanced RSS access in FireFox and Netscape

/// 

/// 2009-05-26 added autodiscovery link for OpenSearch support https://developer.mozilla.org/en/Creating_OpenSearch_plugins_for_Firefox

/// 2009-07-27 added config option for content type so its possible to serve as text/html in anticipation of moving to Html 5

/// 2010-04-27 added logic to automatically add <meta name="viewport" content="width=670, initial-scale=0.45, minimum-scale=0.45"/> for iphone

/// 2011-11-23 added option to automatically add open graph protocol description based on regular meta description, enabled by default



using System;

using System.Globalization;

using System.Text;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

using log4net;

using mojoPortal.Business;

using mojoPortal.Business.WebHelpers;

using Resources;



namespace mojoPortal.Web.UI

{

	public partial class MetaContent : UserControl

	{

        private static readonly ILog log = LogManager.GetLogger(typeof(MetaContent));



        //private const string metaEncodingXhtml = "\n<meta http-equiv=\"Content-Type\" content=\"application/xhtml+xml; charset=utf-8\" />";

        //private const string metaEncodingHtml = "\n<meta http-equiv=\"Content-Type\" content=\"text/html; charset=utf-8\" />";



       

        private string keywordCsv = string.Empty;

        private string description = string.Empty;

        private string additionalMetaMarkup = string.Empty;

        private StringBuilder keywords = null;

        private SiteSettings siteSettings = null;

        private bool preZoomForIPhone = true;



        public bool PreZoomForIPhone

        {

            get { return preZoomForIPhone; }

            set { preZoomForIPhone = value; }

        }



        public string KeywordCsv

        {

            get { return keywordCsv; }

            set { keywordCsv = value; }

        }



        public string Description

        {

            get { return description; }

            set { description = value; }

        }



        private bool addOpenGraphDescription = true;

        /// <summary>

        /// see

        /// http://www.mojoportal.com/Forums/Thread.aspx?thread=9301&mid=34&pageid=5&ItemID=2&pagenumber=1#post38648

        /// </summary>

        public bool AddOpenGraphDescription

        {

            get { return addOpenGraphDescription; }

            set { addOpenGraphDescription = value; }

        }



        public string AdditionalMetaMarkup

        {

            get { return additionalMetaMarkup; }

            set { additionalMetaMarkup = value; }

        }



        private bool disableContentType = false;

        public bool DisableContentType

        {

            get { return disableContentType; }

            set { disableContentType = value; }

        }



        public void AddKeword(string keyword)

        {

            if (keyword == null) { return; }



            if (keywords == null)

            {

                keywords = new StringBuilder();

                keywords.Append(keyword);

                return;

            }



            if (keywords.Length > 0)

            {

                keywords.Append("," + keyword);

            }

            else

            {

                keywords.Append(keyword);

            }

        }



        protected void Page_Load(object sender, EventArgs e)

        {}



        protected override void OnPreRender(EventArgs e)

        {

            base.OnPreRender(e);



            if (WebConfigSettings.AutoSetContentType) { AddEncoding(); }



            AddDescription();

            AddKeywords();



            if (additionalMetaMarkup.Length > 0)

            {

                Literal additionalMeta = new Literal();

                additionalMeta.Text = additionalMetaMarkup;

                this.Controls.Add(additionalMeta);

            }



            AddOpenSearchLink();

            AddIPhoneZoom();



        }



        private void AddIPhoneZoom()

        {

            if (!preZoomForIPhone) { return; }

            if (HttpContext.Current == null) { return; }

            if (Request.UserAgent == null) { return; }

            if (Request.UserAgent.Length == 0) { return; }

            if (!Request.UserAgent.Contains("iPhone")) { return; }



            //http://developer.apple.com/library/ios/#technotes/tn2010/tn2262/_index.html

            //<meta name="viewport" content="width=device-width" />



            Literal lit = new Literal();

            lit.Text = "\n<meta name=\"viewport\" content=\"width=670, initial-scale=0.45, minimum-scale=0.45\" />";

            this.Controls.Add(lit);



        }



        private void AddKeywords()

        {

            if (keywords != null)

            {

                if (keywordCsv.Length > 0)

                {

                    keywordCsv = keywordCsv + "," + keywords.ToString();

                }

                else

                {

                    keywordCsv = keywords.ToString();

                }

            }



            if (keywordCsv.Length == 0) { return; }



            Literal metaKeywordsLiteral = new Literal();

            metaKeywordsLiteral.Text = "\n<meta name=\"keywords\" content=\"" + keywordCsv + "\" />"; 

            this.Controls.Add(metaKeywordsLiteral);



        }



        private void AddDescription()

        {

            if (description.Length == 0) { return; }



            Literal metaDescriptionLiteral = new Literal();

            metaDescriptionLiteral.Text = "\n<meta name=\"description\" content=\"" + description + "\" />";

            if (addOpenGraphDescription)

            {

                metaDescriptionLiteral.Text += "\n<meta name=\"og:description\" content=\"" + description + "\" />";

            }

            this.Controls.Add(metaDescriptionLiteral);



            

        }



        private void AddEncoding()

        {

            if (disableContentType) { return; }



            string contentTypeMeta = "\n<meta http-equiv=\"Content-Type\" content=\"" 

                + WebConfigSettings.ContentMimeType 

                + "; charset=" + WebConfigSettings.ContentEncoding + "\" />";



            Literal metaEncodingLiteral = new Literal();

            metaEncodingLiteral.Text = contentTypeMeta;

            this.Controls.Add(metaEncodingLiteral);

        }



        private void AddOpenSearchLink()

        {

            if (WebConfigSettings.DisableSearchIndex) { return; }

            if (WebConfigSettings.DisableOpenSearchAutoDiscovery) { return; }



            if (siteSettings == null) { siteSettings = CacheHelper.GetCurrentSiteSettings(); }

            if (siteSettings == null) { return; }



            string searchTitle;

            if (siteSettings.OpenSearchName.Length > 0)

            {

                searchTitle = siteSettings.OpenSearchName;

            }

            else

            {

                searchTitle = string.Format(CultureInfo.InvariantCulture, Resource.SearchDiscoveryTitleFormat, siteSettings.SiteName);

            }



            Literal openSearchLink = new Literal();

            openSearchLink.Text = "\n<link rel=\"search\" type=\"application/opensearchdescription+xml\" title=\""

                + searchTitle + "\" href=\"" + SiteUtils.GetNavigationSiteRoot() + "/SearchEngineInfo.ashx" + "\" />";



            this.Controls.Add(openSearchLink);

        }



        // TODO: http://www.w3.org/P3P/validator/20020128/document implement xml

        //http://www.w3.org/P3P/validator.html

        //private void AddP3PLink()

        //{

        //    if (WebConfigSettings.DisableSearchIndex) { return; }

        //    if (WebConfigSettings.DisableOpenSearchAutoDiscovery) { return; }



        //    if (siteSettings == null) { siteSettings = CacheHelper.GetCurrentSiteSettings(); }

        //    if (siteSettings == null) { return; }



        //    string searchTitle = string.Format(CultureInfo.InvariantCulture, Resource.SearchDiscoveryTitleFormat, siteSettings.SiteName);



        //    Literal openSearchLink = new Literal();

        //    openSearchLink.Text = "\n<link rel=\"P3Pv1\" href=\"" + SiteUtils.GetNavigationSiteRoot() + "/SearchEngineInfo.ashx" + "\" />";



        //    this.Controls.Add(openSearchLink);

        //}



        



	}

}