Extending webfinger response (issue:2851) (#3053)

* Extending webfinger response #2851
1. Added Logo
 - rel: avatar as there wasn't any appropriate value in [Link relations registry](https://www.iana.org/assignments/link-relations/)
 - type: default value image/png or else it is determined file type extension
2. Added Stream
 - rel: stream as there wasn't appropriate value in [Link relations registry](https://www.iana.org/assignments/link-relations/)
 - type: video/H264 based on [IANA media types](https://www.iana.org/assignments/media-types/media-types.xhtml#video)

Changes after review:

1. Updated the rel type for avatar based on webfinger rel.
2. Updated the rel type for stream link and href value that closely associates to it.

* adding period after comments

* updating typo

activitypub/apmodels/utils.go

@@ -4,6 +4,7 @@ import (
 	"encoding/json"
 	"net/url"
 	"path"
+	"path/filepath"
 
 	"github.com/go-fed/activity/streams"
 	"github.com/go-fed/activity/streams/vocab"
@@ -60,3 +61,50 @@ func Serialize(obj vocab.Type) ([]byte, error) {
 
 	return b, err
 }
+
+// MakeLocalIRIForStreamURL will return a full IRI for the local server stream url.
+func MakeLocalIRIForStreamURL() *url.URL {
+	host := data.GetServerURL()
+	u, err := url.Parse(host)
+	if err != nil {
+		log.Errorln("unable to parse local IRI stream url", err)
+		return nil
+	}
+
+	u.Path = path.Join(u.Path, "/hls/stream.m3u8")
+
+	return u
+}
+
+// MakeLocalIRIforLogo will return a full IRI for the local server logo.
+func MakeLocalIRIforLogo() *url.URL {
+	host := data.GetServerURL()
+	u, err := url.Parse(host)
+	if err != nil {
+		log.Errorln("unable to parse local IRI stream url", err)
+		return nil
+	}
+
+	u.Path = path.Join(u.Path, "/logo/external")
+
+	return u
+}
+
+// GetLogoType will return the rel value for the webfinger response and
+// the default static image is of type png.
+func GetLogoType() string {
+	imageFilename := data.GetLogoPath()
+	if imageFilename == "" {
+		return "image/png"
+	}
+
+	logoType := "image/jpeg"
+	if filepath.Ext(imageFilename) == ".svg" {
+		logoType = "image/svg+xml"
+	} else if filepath.Ext(imageFilename) == ".gif" {
+		logoType = "image/gif"
+	} else if filepath.Ext(imageFilename) == ".png" {
+		logoType = "image/png"
+	}
+	return logoType
+}

activitypub/apmodels/webfinger.go

@@ -26,7 +26,9 @@ type Link struct {
 // MakeWebfingerResponse will create a new Webfinger response.
 func MakeWebfingerResponse(account string, inbox string, host string) WebfingerResponse {
 	accountIRI := MakeLocalIRIForAccount(account)
-
+	streamIRI := MakeLocalIRIForStreamURL()
+	logoIRI := MakeLocalIRIforLogo()
+	logoType := GetLogoType()
 	return WebfingerResponse{
 		Subject: fmt.Sprintf("acct:%s@%s", account, host),
 		Aliases: []string{
@@ -43,6 +45,16 @@ func MakeWebfingerResponse(account string, inbox string, host string) WebfingerR
 				Type: "text/html",
 				Href: accountIRI.String(),
 			},
+			{
+				Rel:  "http://webfinger.net/rel/avatar",
+				Type: logoType,
+				Href: logoIRI.String(),
+			},
+			{
+				Rel:  "alternate",
+				Type: "application/x-mpegURL",
+				Href: streamIRI.String(),
+			},
 		},
 	}
 }