From e68b9d00a6e05b3a941f63ffb696f91e554ac5ec Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel@debian.org>
Date: Fri, 18 Oct 2024 20:33:49 +0200
Subject: Adding upstream version 9.0.3.

Signed-off-by: Daniel Baumann <daniel@debian.org>
---
 routers/web/webfinger.go | 167 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 167 insertions(+)
 create mode 100644 routers/web/webfinger.go

(limited to 'routers/web/webfinger.go')

diff --git a/routers/web/webfinger.go b/routers/web/webfinger.go
new file mode 100644
index 0000000..1f3de70
--- /dev/null
+++ b/routers/web/webfinger.go
@@ -0,0 +1,167 @@
+// Copyright 2022 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package web
+
+import (
+	"fmt"
+	"net/http"
+	"net/url"
+	"strings"
+
+	user_model "code.gitea.io/gitea/models/user"
+	"code.gitea.io/gitea/modules/log"
+	"code.gitea.io/gitea/modules/setting"
+	"code.gitea.io/gitea/services/context"
+)
+
+// 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) {
+	appURL, _ := url.Parse(setting.AppURL)
+
+	resource, err := url.Parse(ctx.FormTrim("resource"))
+	if err != nil {
+		ctx.Error(http.StatusBadRequest)
+		return
+	}
+
+	var u *user_model.User
+
+	switch resource.Scheme {
+	case "acct":
+		// allow only the current host
+		parts := strings.SplitN(resource.Opaque, "@", 2)
+		if len(parts) != 2 {
+			ctx.Error(http.StatusBadRequest)
+			return
+		}
+		if parts[1] != appURL.Host {
+			ctx.Error(http.StatusBadRequest)
+			return
+		}
+
+		u, err = user_model.GetUserByName(ctx, parts[0])
+	case "mailto":
+		u, err = user_model.GetUserByEmail(ctx, resource.Opaque)
+		if u != nil && u.KeepEmailPrivate {
+			err = user_model.ErrUserNotExist{}
+		}
+	case "https", "http":
+		if resource.Host != appURL.Host {
+			ctx.Error(http.StatusBadRequest)
+			return
+		}
+
+		p := strings.Trim(resource.Path, "/")
+		if len(p) == 0 {
+			ctx.Error(http.StatusNotFound)
+			return
+		}
+
+		parts := strings.Split(p, "/")
+
+		switch len(parts) {
+		case 1: // user
+			u, err = user_model.GetUserByName(ctx, parts[0])
+		case 2: // repository
+			ctx.Error(http.StatusNotFound)
+			return
+
+		case 3:
+			switch parts[2] {
+			case "issues":
+				ctx.Error(http.StatusNotFound)
+				return
+
+			case "pulls":
+				ctx.Error(http.StatusNotFound)
+				return
+
+			case "projects":
+				ctx.Error(http.StatusNotFound)
+				return
+
+			default:
+				ctx.Error(http.StatusNotFound)
+				return
+			}
+
+		default:
+			ctx.Error(http.StatusNotFound)
+			return
+		}
+
+	default:
+		ctx.Error(http.StatusBadRequest)
+		return
+	}
+	if err != nil {
+		if user_model.IsErrUserNotExist(err) {
+			ctx.Error(http.StatusNotFound)
+		} else {
+			log.Error("Error getting user: %s Error: %v", resource.Opaque, err)
+			ctx.Error(http.StatusInternalServerError)
+		}
+		return
+	}
+
+	if !user_model.IsUserVisibleToViewer(ctx, u, ctx.Doer) {
+		ctx.Error(http.StatusNotFound)
+		return
+	}
+
+	aliases := []string{
+		u.HTMLURL(),
+		appURL.String() + "api/v1/activitypub/user-id/" + fmt.Sprint(u.ID),
+	}
+	if !u.KeepEmailPrivate {
+		aliases = append(aliases, fmt.Sprintf("mailto:%s", u.Email))
+	}
+
+	links := []*webfingerLink{
+		{
+			Rel:  "http://webfinger.net/rel/profile-page",
+			Type: "text/html",
+			Href: u.HTMLURL(),
+		},
+		{
+			Rel:  "http://webfinger.net/rel/avatar",
+			Href: u.AvatarLink(ctx),
+		},
+		{
+			Rel:  "self",
+			Type: "application/activity+json",
+			Href: appURL.String() + "api/v1/activitypub/user-id/" + fmt.Sprint(u.ID),
+		},
+		{
+			Rel:  "http://openid.net/specs/connect/1.0/issuer",
+			Href: appURL.String(),
+		},
+	}
+
+	ctx.Resp.Header().Add("Access-Control-Allow-Origin", "*")
+	ctx.JSON(http.StatusOK, &webfingerJRD{
+		Subject: fmt.Sprintf("acct:%s@%s", url.QueryEscape(u.Name), appURL.Host),
+		Aliases: aliases,
+		Links:   links,
+	})
+	ctx.Resp.Header().Set("Content-Type", "application/jrd+json")
+}
-- 
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