From e3aff2760adbd1dd0651fe9e96a4a6d826e72393 Mon Sep 17 00:00:00 2001
From: restran <grestran@gmail.com>
Date: Tue, 25 Apr 2017 15:49:03 +0800
Subject: [PATCH] support keywords from page.keywords, page.tag or
 theme.keywords

---
 lib/plugins/helper/open_graph.js | 34 ++++++++++++++++++++++----------
 1 file changed, 24 insertions(+), 10 deletions(-)

diff --git a/lib/plugins/helper/open_graph.js b/lib/plugins/helper/open_graph.js
index 035c25e1e4..12e47ceecc 100644
--- a/lib/plugins/helper/open_graph.js
+++ b/lib/plugins/helper/open_graph.js
@@ -5,16 +5,23 @@ var moment = require('moment');
 var util = require('hexo-util');
 var htmlTag = util.htmlTag;
 var stripHTML = util.stripHTML;
+var escapeHTML = util.escapeHTML;
 var cheerio;
 
-function meta(name, content) {
+function meta(name, content, escape) {
+  if (escape !== false) {
+    content = escapeHTML(content);
+  }
   return htmlTag('meta', {
     name: name,
     content: content
   }) + '\n';
 }
 
-function og(name, content) {
+function og(name, content, escape) {
+  if (escape !== false) {
+    content = escapeHTML(content);
+  }
   return htmlTag('meta', {
     property: name,
     content: content
@@ -28,10 +35,12 @@ function openGraphHelper(options) {
 
   var page = this.page;
   var config = this.config;
+  var theme = this.theme;
   var content = page.content;
   var images = options.image || options.images || page.photos || [];
   var description = options.description || page.description || page.excerpt || content || config.description;
-  var keywords = page.tags;
+  // support keywords from page.keywords, page.tag or theme.keywords
+  var keywords = page.keywords || page.tags || theme.keywords;
   var title = options.title || page.title || config.title;
   var type = options.type || (this.is_post() ? 'article' : 'website');
   var url = options.url || this.url;
@@ -68,17 +77,22 @@ function openGraphHelper(options) {
     result += meta('description', description);
   }
 
-  if (keywords && keywords.toArray()) {
-    result += meta('keywords', keywords.map(function(tag) {
-      return tag.name;
-    }).filter(function(keyword) {
-      return !!keyword;
-    }).join());
+  // support keywords in type of string or array
+  if (keywords) {
+    if (typeof keywords === 'string') {
+      result += meta('keywords', keywords);
+    } else if (keywords.toArray()) {
+       result += meta('keywords', keywords.map(function(tag) {
+        return tag.name;
+      }).filter(function(keyword) {
+        return !!keyword;
+      }).join());
+    }
   }
 
   result += og('og:type', type);
   result += og('og:title', title);
-  result += og('og:url', url);
+  result += og('og:url', url, false);
   result += og('og:site_name', siteName);
   if (description) {
     result += og('og:description', description);