feat: query webfinger

routers/web/explore/user.go

@@ -17,6 +17,7 @@ import (
 	"code.gitea.io/gitea/modules/sitemap"
 	"code.gitea.io/gitea/modules/structs"
 	"code.gitea.io/gitea/services/context"
+	"code.gitea.io/gitea/services/forgefed"
 )
 
 const (
@@ -99,6 +100,31 @@ func RenderUserSearch(ctx *context.Context, opts *user_model.SearchUserOptions,
 			return
 		}
 	}
+
+	if len(opts.Keyword) > 0 && forgefed.IsFingerable(opts.Keyword) {
+		webfingerRes, err := forgefed.WebFingerLookup(opts.Keyword)
+		if err != nil {
+			ctx.ServerError("SearchUsers", err)
+			return
+		}
+		person, err := forgefed.GetActor(webfingerRes.GetActorLink().Href)
+		if err != nil {
+			ctx.ServerError("SearchUsers", err)
+			return
+		}
+
+		_, err = forgefed.SavePerson(ctx, person)
+		if err != nil {
+			ctx.ServerError("SearchUsers", err)
+			return
+		}
+		//		users, count, err = user_model.SearchUsers(ctx, opts)
+		//		if err != nil {
+		//			ctx.ServerError("SearchUsers", err)
+		//			return
+		//		}
+	}
+
 	if isSitemap {
 		m := sitemap.NewSitemap()
 		for _, item := range users {

routers/web/webfinger.go

@@ -13,25 +13,11 @@ import (
 	"code.gitea.io/gitea/modules/log"
 	"code.gitea.io/gitea/modules/setting"
 	"code.gitea.io/gitea/services/context"
+	"code.gitea.io/gitea/services/forgefed"
 )
 
 // https://datatracker.ietf.org/doc/html/draft-ietf-appsawg-webfinger-14#section-4.4
 
-type webfingerJRD struct {
-	Subject    string           `json:"subject,omitempty"`
-	Aliases    []string         `json:"aliases,omitempty"`
-	Properties map[string]any   `json:"properties,omitempty"`
-	Links      []*webfingerLink `json:"links,omitempty"`
-}
-
-type webfingerLink struct {
-	Rel        string            `json:"rel,omitempty"`
-	Type       string            `json:"type,omitempty"`
-	Href       string            `json:"href,omitempty"`
-	Titles     map[string]string `json:"titles,omitempty"`
-	Properties map[string]any    `json:"properties,omitempty"`
-}
-
 // WebfingerQuery returns information about a resource
 // https://datatracker.ietf.org/doc/html/rfc7565
 func WebfingerQuery(ctx *context.Context) {
@@ -104,7 +90,7 @@ func WebfingerQuery(ctx *context.Context) {
 		aliases = append(aliases, fmt.Sprintf("mailto:%s", u.Email))
 	}
 
-	links := []*webfingerLink{
+	links := []*forgefed.WebfingerLink{
 		{
 			Rel:  "http://webfinger.net/rel/profile-page",
 			Type: "text/html",
@@ -127,7 +113,7 @@ func WebfingerQuery(ctx *context.Context) {
 
 	ctx.Resp.Header().Add("Content-Type", "application/jrd+json")
 	ctx.Resp.Header().Add("Access-Control-Allow-Origin", "*")
-	ctx.JSON(http.StatusOK, &webfingerJRD{
+	ctx.JSON(http.StatusOK, &forgefed.WebfingerJRD{
 		Subject: fmt.Sprintf("acct:%s@%s", url.QueryEscape(u.Name), appURL.Host),
 		Aliases: aliases,
 		Links:   links,

services/forgefed/webfinger.go

@@ -0,0 +1,167 @@
+package forgefed
+
+import (
+	"encoding/json"
+	"errors"
+	"fmt"
+	"net/http"
+	"net/url"
+	"strings"
+
+	"code.gitea.io/gitea/modules/log"
+)
+
+// https://datatracker.ietf.org/doc/html/draft-ietf-appsawg-webfinger-14#section-4.4
+
+type WebfingerJRD struct {
+	Subject    string           `json:"subject,omitempty"`
+	Aliases    []string         `json:"aliases,omitempty"`
+	Properties map[string]any   `json:"properties,omitempty"`
+	Links      []*WebfingerLink `json:"links,omitempty"`
+}
+
+func (w WebfingerJRD) GetAvatar() *WebfingerLink {
+	for _, link := range w.Links {
+		if link.Rel == "http://webfinger.net/rel/avatar" {
+			return link
+		}
+	}
+	return nil
+}
+
+func (w WebfingerJRD) GetProfilePage() *WebfingerLink {
+	for _, link := range w.Links {
+		if link.Rel == "http://webfinger.net/rel/profile-page" && link.Type == "text/html" {
+			return link
+		}
+	}
+	return nil
+}
+
+func (w WebfingerJRD) GetActorLink() *WebfingerLink {
+	for _, link := range w.Links {
+		if link.Rel == "self" && link.Type == "application/activity+json" {
+			return link
+		}
+	}
+	return nil
+}
+
+type WebfingerLink struct {
+	Rel        string            `json:"rel,omitempty"`
+	Type       string            `json:"type,omitempty"`
+	Href       string            `json:"href,omitempty"`
+	Titles     map[string]string `json:"titles,omitempty"`
+	Properties map[string]any    `json:"properties,omitempty"`
+}
+
+func GetHostnameFromResource(resource string) (string, error) {
+	r := resource
+	if strings.HasPrefix(resource, "@") {
+		resource, _ = strings.CutPrefix(resource, "@")
+	}
+	actor, err := url.Parse(resource)
+	if err != nil {
+		return "", err
+	}
+
+	var hostname string
+	switch actor.Scheme {
+	case "":
+		i := strings.Split(resource, "@")
+		if len(i) != 2 {
+			log.Error("Invalid webfinger query " + r)
+			return "", errors.New("Invalid webfinger query " + r)
+		}
+		hostname = i[1]
+	case "mailto":
+		i := strings.Split(resource, "@")
+		if len(i) != 2 {
+			log.Error("Invalid webfinger query " + r)
+			return "", errors.New("Invalid webfinger query " + r)
+		}
+		hostname = i[1]
+	case "https":
+		hostname = actor.Host
+	default:
+		log.Error("Invalid webfinger query " + r)
+		return "", errors.New("Invalid webfinger query" + r)
+
+	}
+	return hostname, nil
+}
+
+// Get Actor object by performing webfinger lookup
+func WebFingerLookup(q string) (*WebfingerJRD, error) {
+	if strings.HasPrefix(q, "@") {
+		q, _ = strings.CutPrefix(q, "@")
+	}
+	actor, err := url.Parse(q)
+	if err != nil {
+		return nil, err
+	}
+
+	var res string
+	switch actor.Scheme {
+	case "":
+		res = fmt.Sprintf("acct:%s", q)
+	case "mailto":
+		res = q
+	case "https":
+		res = q
+	default:
+		return nil, errors.New("Invalid webfinger query")
+
+	}
+
+	hostname, err := GetHostnameFromResource(q)
+	if err != nil {
+		return nil, err
+	}
+
+	link := fmt.Sprintf("https://%s/.well-known/webfinger?resource=%s", hostname, res)
+
+	r, err := http.Get(link)
+	if err != nil {
+		return nil, err
+	}
+	defer r.Body.Close()
+
+	webfingerResponse := new(WebfingerJRD)
+	err = json.NewDecoder(r.Body).Decode(webfingerResponse)
+	if err != nil {
+		return nil, err
+	}
+	return webfingerResponse, nil
+}
+
+func IsFingerable(resource string) bool {
+	if strings.HasPrefix(resource, "@") {
+		resource, _ = strings.CutPrefix(resource, "@")
+	}
+	actor, err := url.Parse(resource)
+	if err != nil {
+		return false
+	}
+
+	switch actor.Scheme {
+	case "":
+		i := strings.Split(resource, "@")
+		if len(i) == 2 {
+			_ = i[1] // TODO: do len check before referencing element #2
+			return true
+		}
+		return false
+	case "mailto":
+		i := strings.Split(resource, "@")
+		if len(i) == 2 {
+			_ = i[1]
+			return true
+		}
+		return false
+	case "https":
+		return true
+	default:
+		return false
+	}
+}