Fix og:image:width and og:image:height missing.

app/controllers/page_contents_controller.rb

@@ -1,5 +1,8 @@
 class PageContentsController < OrbitAdminController
   require 'uri'
+
+  IMG_INFO = {}
+
   def index
     params = OrbitHelper.params
     if params["wiki"].present?
@@ -20,9 +23,49 @@ class PageContentsController < OrbitAdminController
     doc = Nokogiri::HTML( html )
     img_srcs = doc.css('img').map{ |i| i['src'] }.compact
     metas = [{"property" => "og:description", "content" => meta_desc},{"property" => "og:type", "content" => "Article"}]
-    # if img_srcs.count > 0
-      # metas << {"property" => "og:image", "content" => URI.join(request.base_url, URI.encode(img_srcs[0])).to_s}
-    # end
+    if img_srcs.count > 0
+      img_src = img_srcs[0]
+      metas << {"property" => "og:image", "content" => URI.join(request.base_url, URI.encode(img_src)).to_s}
+      if img_src.start_with?('/')
+        img_src_path = File.join('public', img_src)
+        image = MiniMagick::Image.open(img_src_path)
+        if image[:width]
+          metas << {"property" => "og:image:width", "content" => image[:width].to_s}
+        end
+        if image[:height]
+          metas << {"property" => "og:image:height", "content" => image[:height].to_s}
+        end
+      else
+        res = get_response(URI.parse(img_src))
+        image = IMG_INFO[img_src]
+        if image.nil?
+          if res.code == "200"
+            image_file = Tempfile.new
+            image_file.binmode
+            image_file.write(res.body)
+            image = MiniMagick::Image.open(image_file.path)
+            IMG_INFO[img_src] = {width: image[:width], height: image[:height]}
+            if image[:width]
+              metas << {"property" => "og:image:width", "content" => image[:width].to_s}
+            end
+            if image[:height]
+              metas << {"property" => "og:image:height", "content" => image[:height].to_s}
+            end
+            image_file.close
+            image_file.unlink
+          else
+            IMG_INFO[img_src] = {}
+          end
+        else
+          if image[:width]
+            metas << {"property" => "og:image:width", "content" => image[:width].to_s}
+          end
+          if image[:height]
+            metas << {"property" => "og:image:height", "content" => image[:height].to_s}
+          end
+        end
+      end
+    end
     OrbitHelper.render_meta_tags(metas)
 
     {
@@ -33,4 +76,51 @@ class PageContentsController < OrbitAdminController
       "url_to_edit" => url_to_edit
     }
   end
+
+private
+  def net_http_get_response(uri,headers={})
+    port = uri.port
+    host = uri.host
+    http = Net::HTTP.new(host, port)
+    scheme = uri.scheme
+    if scheme == "https" || port.to_i == 443
+      http.verify_mode = OpenSSL::SSL::VERIFY_NONE
+      http.use_ssl = true
+    end
+    http.open_timeout = 5
+    relative_path = (uri.path.blank? ? "/" : uri.path)
+    if !relative_path.start_with?("http") && !relative_path.start_with?("/")
+      relative_path = "/" + relative_path
+    end
+    relative_path = relative_path.sub(/^\/\.\.\/(\.\.\/)*/,'/')
+    while relative_path.include?("/../") do
+      relative_path = relative_path.gsub(/\/[^\/]+\/\.\.\//,'/')
+    end
+    relative_path = relative_path.gsub('//','/')
+    relative_path = URI.decode(relative_path)
+    relative_path += (uri.query.blank? ? '' : "?#{URI.decode(uri.query)}")
+    res = http.get(relative_path.gsub(" ","%20"))
+    if res.code == "400"
+      res = http.get(URI.encode(relative_path.gsub(" ","%20")))
+    end
+    res.uri = uri
+    res
+  end
+  def get_response(uri)
+    res = net_http_get_response(uri)
+    if res.code == "301" || res.code == "302"
+      location = res['Location']
+      cookie = res['Set-Cookie']  
+      headers = {
+        'Cookie' => cookie.to_s
+      }
+      if location[0] == "/"
+          uri = URI.parse("#{uri.scheme}://#{uri.host}#{location}")
+      else
+          uri = URI.parse(location)
+      end
+      res = net_http_get_response(uri,headers)
+    end
+    return res
+  end
 end