Support webcrawers, bots, opengraph with a basic server-rendered metadata page. Closes #36

controllers/index.go

@@ -1,18 +1,36 @@
 package controllers
 
 import (
+	"fmt"
+	"log"
 	"net/http"
 	"path"
+	"text/template"
 
+	"github.com/gabek/owncast/config"
 	"github.com/gabek/owncast/core"
 	"github.com/gabek/owncast/router/middleware"
 	"github.com/gabek/owncast/utils"
+
+	"xojoc.pw/useragent"
 )
 
+type MetadataPage struct {
+	Config       config.InstanceDetails
+	RequestedURL string
+}
+
 //IndexHandler handles the default index route
 func IndexHandler(w http.ResponseWriter, r *http.Request) {
 	middleware.EnableCors(&w)
 
+	ua := useragent.Parse(r.UserAgent())
+
+	if ua.Type == useragent.Crawler && r.URL.Path == "/" {
+		handleScraperMetadataPage(w, r)
+		return
+	}
+
 	http.ServeFile(w, r, path.Join("webroot", r.URL.Path))
 
 	if path.Ext(r.URL.Path) == ".m3u8" {
@@ -22,3 +40,19 @@ func IndexHandler(w http.ResponseWriter, r *http.Request) {
 		core.SetClientActive(clientID)
 	}
 }
+
+// Return a basic HTML page with server-rendered metadata from the config file
+// to give to Opengraph clients and web scrapers (bots, web crawlers, etc).
+func handleScraperMetadataPage(w http.ResponseWriter, r *http.Request) {
+	tmpl := template.Must(template.ParseFiles(path.Join("static", "metadata.html")))
+
+	fullURL := fmt.Sprintf("http://%s%s", r.Host, r.URL.Path)
+	metadata := MetadataPage{config.Config.InstanceDetails, fullURL}
+
+	w.Header().Set("Content-Type", "text/html")
+	err := tmpl.Execute(w, metadata)
+
+	if err != nil {
+		log.Panicln(err)
+	}
+}