Added customizable og-metadata to notes

Signed-off-by: Erik Michelson <erik@liltv.de>

lib/response.js

@@ -98,12 +98,14 @@ function responseCodiMD (res, note) {
   var meta = models.Note.parseMeta(extracted.meta)
   var title = models.Note.decodeTitle(note.title)
   title = models.Note.generateWebTitle(meta.title || title)
+  var opengraph = models.Note.parseOpengraph(meta, title)
   res.set({
     'Cache-Control': 'private', // only cache by client
     'X-Robots-Tag': 'noindex, nofollow' // prevent crawling
   })
   res.render('codimd.ejs', {
-    title: title
+    title: title,
+    opengraph: opengraph
   })
 }
 
@@ -217,6 +219,7 @@ function showPublishNote (req, res, next) {
       var updatetime = note.lastchangeAt
       var title = models.Note.decodeTitle(note.title)
       title = models.Note.generateWebTitle(meta.title || title)
+      var ogdata = models.Note.parseOpengraph(meta, title)
       var data = {
         title: title,
         description: meta.description || (markdown ? models.Note.generateDescription(markdown) : null),
@@ -232,7 +235,8 @@ function showPublishNote (req, res, next) {
         GA: meta.GA,
         disqus: meta.disqus,
         cspNonce: res.locals.nonce,
-        dnt: req.headers.dnt
+        dnt: req.headers.dnt,
+        opengraph: ogdata
       }
       return renderPublish(data, res)
     }).catch(function (err) {