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df55f9b189This change adds an entry to the `links` field of the `/.well-known/webfinger` response. The new entry points to the `appURL` as an OpenID issuer. This is consistent with the output of `/.well-known/openid-configuration`, which also uses the value of `appURL`. This change is required for Tailscale SSO to work, as it uses the OpenID Issuer URL when querying the Tailscale user email during signup/login ([docs](https://tailscale.com/kb/1240/sso-custom-oidc/#webfinger-setup)).
121 lines
3 KiB
Go
121 lines
3 KiB
Go
// Copyright 2022 The Gitea Authors. All rights reserved.
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// SPDX-License-Identifier: MIT
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package web
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import (
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"fmt"
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"net/http"
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"net/url"
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"strings"
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user_model "code.gitea.io/gitea/models/user"
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"code.gitea.io/gitea/modules/context"
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"code.gitea.io/gitea/modules/log"
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"code.gitea.io/gitea/modules/setting"
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)
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// https://datatracker.ietf.org/doc/html/draft-ietf-appsawg-webfinger-14#section-4.4
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type webfingerJRD struct {
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Subject string `json:"subject,omitempty"`
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Aliases []string `json:"aliases,omitempty"`
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Properties map[string]any `json:"properties,omitempty"`
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Links []*webfingerLink `json:"links,omitempty"`
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}
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type webfingerLink struct {
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Rel string `json:"rel,omitempty"`
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Type string `json:"type,omitempty"`
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Href string `json:"href,omitempty"`
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Titles map[string]string `json:"titles,omitempty"`
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Properties map[string]any `json:"properties,omitempty"`
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}
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// WebfingerQuery returns information about a resource
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// https://datatracker.ietf.org/doc/html/rfc7565
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func WebfingerQuery(ctx *context.Context) {
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appURL, _ := url.Parse(setting.AppURL)
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resource, err := url.Parse(ctx.FormTrim("resource"))
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if err != nil {
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ctx.Error(http.StatusBadRequest)
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return
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}
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var u *user_model.User
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switch resource.Scheme {
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case "acct":
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// allow only the current host
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parts := strings.SplitN(resource.Opaque, "@", 2)
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if len(parts) != 2 {
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ctx.Error(http.StatusBadRequest)
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return
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}
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if parts[1] != appURL.Host {
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ctx.Error(http.StatusBadRequest)
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return
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}
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u, err = user_model.GetUserByName(ctx, parts[0])
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case "mailto":
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u, err = user_model.GetUserByEmail(ctx, resource.Opaque)
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if u != nil && u.KeepEmailPrivate {
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err = user_model.ErrUserNotExist{}
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}
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default:
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ctx.Error(http.StatusBadRequest)
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return
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}
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if err != nil {
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if user_model.IsErrUserNotExist(err) {
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ctx.Error(http.StatusNotFound)
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} else {
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log.Error("Error getting user: %s Error: %v", resource.Opaque, err)
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ctx.Error(http.StatusInternalServerError)
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}
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return
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}
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if !user_model.IsUserVisibleToViewer(ctx, u, ctx.Doer) {
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ctx.Error(http.StatusNotFound)
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return
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}
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aliases := []string{
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u.HTMLURL(),
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appURL.String() + "api/v1/activitypub/user-id/" + fmt.Sprint(u.ID),
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}
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if !u.KeepEmailPrivate {
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aliases = append(aliases, fmt.Sprintf("mailto:%s", u.Email))
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}
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links := []*webfingerLink{
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{
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Rel: "http://webfinger.net/rel/profile-page",
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Type: "text/html",
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Href: u.HTMLURL(),
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},
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{
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Rel: "http://webfinger.net/rel/avatar",
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Href: u.AvatarLink(ctx),
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},
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{
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Rel: "self",
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Type: "application/activity+json",
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Href: appURL.String() + "api/v1/activitypub/user-id/" + fmt.Sprint(u.ID),
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},
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{
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Rel: "http://openid.net/specs/connect/1.0/issuer",
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Href: appURL.String(),
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},
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}
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ctx.Resp.Header().Add("Access-Control-Allow-Origin", "*")
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ctx.JSON(http.StatusOK, &webfingerJRD{
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Subject: fmt.Sprintf("acct:%s@%s", url.QueryEscape(u.Name), appURL.Host),
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Aliases: aliases,
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Links: links,
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})
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}
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