Add Webfinger endpoint (#19462)

This adds the [Webfinger](https://webfinger.net/) endpoint for federation.

Supported schemes are `acct` and `mailto`. The profile and avatar url are returned as metadata.

1 files changed, 68 insertions, 0 deletions

diff --git a/integrations/webfinger_test.go b/integrations/webfinger_test.go
new file mode 100644
index 0000000000..8ba93c3f20
--- /dev/null
+++ b/integrations/webfinger_test.go
@@ -0,0 +1,68 @@
+// Copyright 2022 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package integrations
+
+import (
+	"fmt"
+	"net/http"
+	"net/url"
+	"testing"
+
+	"code.gitea.io/gitea/models/unittest"
+	user_model "code.gitea.io/gitea/models/user"
+	"code.gitea.io/gitea/modules/setting"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestWebfinger(t *testing.T) {
+	defer prepareTestEnv(t)()
+
+	setting.Federation.Enabled = true
+	defer func() {
+		setting.Federation.Enabled = false
+	}()
+
+	user := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: 2}).(*user_model.User)
+
+	appURL, _ := url.Parse(setting.AppURL)
+
+	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]interface{} `json:"properties,omitempty"`
+	}
+
+	type webfingerJRD struct {
+		Subject    string                 `json:"subject,omitempty"`
+		Aliases    []string               `json:"aliases,omitempty"`
+		Properties map[string]interface{} `json:"properties,omitempty"`
+		Links      []*webfingerLink       `json:"links,omitempty"`
+	}
+
+	session := loginUser(t, "user1")
+
+	req := NewRequest(t, "GET", fmt.Sprintf("/.well-known/webfinger?resource=acct:%s@%s", user.LowerName, appURL.Host))
+	resp := MakeRequest(t, req, http.StatusOK)
+
+	var jrd webfingerJRD
+	DecodeJSON(t, resp, &jrd)
+	assert.Equal(t, "acct:user2@"+appURL.Host, jrd.Subject)
+	assert.ElementsMatch(t, []string{user.HTMLURL()}, jrd.Aliases)
+
+	req = NewRequest(t, "GET", fmt.Sprintf("/.well-known/webfinger?resource=acct:%s@%s", user.LowerName, "unknown.host"))
+	MakeRequest(t, req, http.StatusBadRequest)
+
+	req = NewRequest(t, "GET", fmt.Sprintf("/.well-known/webfinger?resource=acct:%s@%s", "user31", appURL.Host))
+	MakeRequest(t, req, http.StatusNotFound)
+
+	req = NewRequest(t, "GET", fmt.Sprintf("/.well-known/webfinger?resource=acct:%s@%s", "user31", appURL.Host))
+	session.MakeRequest(t, req, http.StatusOK)
+
+	req = NewRequest(t, "GET", fmt.Sprintf("/.well-known/webfinger?resource=mailto:%s", user.Email))
+	MakeRequest(t, req, http.StatusNotFound)
+}