#4257 Added functionality to create previews for post links using open graph data from those links. (#4890)

2017-01-20 23:11:13 +05:30
--- a/vendor/github.com/dyatlov/go-opengraph/examples/advanced.go
+++ b/vendor/github.com/dyatlov/go-opengraph/examples/advanced.go
@@ -0,0 +1,58 @@
+package main
+
+import (
+	"fmt"
+	"strings"
+
+	"github.com/dyatlov/go-opengraph/opengraph"
+	"golang.org/x/net/html"
+)
+
+func main() {
+	h := `<html><head><meta property="og:type" content="article" />
+  <meta property="og:title" content="WordPress 4.3 &quot;Billie&quot;" />
+  <meta property="og:url" content="https://wordpress.org/news/2015/08/billie/" /></head><body></body></html>`
+
+	og := opengraph.NewOpenGraph()
+
+	doc, err := html.Parse(strings.NewReader(h))
+	if err != nil {
+		fmt.Println(err)
+		return
+	}
+
+	var parseHead func(*html.Node)
+	parseHead = func(n *html.Node) {
+		for c := n.FirstChild; c != nil; c = c.NextSibling {
+			if c.Type == html.ElementNode && c.Data == "meta" {
+				m := make(map[string]string)
+				for _, a := range c.Attr {
+					m[a.Key] = a.Val
+				}
+
+				og.ProcessMeta(m)
+			}
+		}
+	}
+
+	var f func(*html.Node)
+	f = func(n *html.Node) {
+		for c := n.FirstChild; c != nil; c = c.NextSibling {
+			if c.Type == html.ElementNode {
+				if c.Data == "head" {
+					parseHead(c)
+					continue
+				} else if c.Data == "body" { // OpenGraph is only in head, so we don't need body
+					break
+				}
+			}
+			f(c)
+		}
+	}
+	f(doc)
+
+	fmt.Printf("Type: %s\n", og.Type)
+	fmt.Printf("Title: %s\n", og.Title)
+	fmt.Printf("URL: %s\n", og.URL)
+	fmt.Printf("String/JSON Representation: %s\n", og)
+}
--- a/vendor/github.com/dyatlov/go-opengraph/examples/simple.go
+++ b/vendor/github.com/dyatlov/go-opengraph/examples/simple.go
@@ -0,0 +1,27 @@
+package main
+
+import (
+	"fmt"
+	"strings"
+
+	"github.com/dyatlov/go-opengraph/opengraph"
+)
+
+func main() {
+	html := `<html><head><meta property="og:type" content="article" />
+  <meta property="og:title" content="WordPress 4.3 &quot;Billie&quot;" />
+  <meta property="og:url" content="https://wordpress.org/news/2015/08/billie/" /></head><body></body></html>`
+
+	og := opengraph.NewOpenGraph()
+	err := og.ProcessHTML(strings.NewReader(html))
+
+	if err != nil {
+		fmt.Println(err)
+		return
+	}
+
+	fmt.Printf("Type: %s\n", og.Type)
+	fmt.Printf("Title: %s\n", og.Title)
+	fmt.Printf("URL: %s\n", og.URL)
+	fmt.Printf("String/JSON Representation: %s\n", og)
+}