chore: initialize Gitea v1.27.2 fork

Includes direct password setup links in registration emails.

Assisted-by: Codex:GPT-5

modules/auth/webauthn/webauthn.go

@@ -0,0 +1,77 @@
+// Copyright 2021 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package webauthn
+
+import (
+	"context"
+	"encoding/binary"
+	"encoding/gob"
+
+	"gitea.dev/models/auth"
+	user_model "gitea.dev/models/user"
+	"gitea.dev/modules/setting"
+	"gitea.dev/modules/util"
+
+	"github.com/go-webauthn/webauthn/protocol"
+	"github.com/go-webauthn/webauthn/webauthn"
+)
+
+// WebAuthn represents the global WebAuthn instance
+var WebAuthn *webauthn.WebAuthn
+
+// Init initializes the WebAuthn instance from the config.
+func Init() {
+	gob.Register(&webauthn.SessionData{}) // TODO: CHI-SESSION-GOB-REGISTER.
+
+	appURL, _ := protocol.FullyQualifiedOrigin(setting.AppURL)
+
+	WebAuthn = &webauthn.WebAuthn{
+		Config: &webauthn.Config{
+			RPDisplayName:         setting.AppName,
+			RPID:                  setting.Domain,
+			RPOrigins:             []string{appURL},
+			AttestationPreference: protocol.PreferNoAttestation, // Gitea never verifies attestation
+		},
+	}
+}
+
+// user represents an implementation of webauthn.User based on User model
+type user struct {
+	ctx  context.Context
+	User *user_model.User
+
+	defaultAuthFlags protocol.AuthenticatorFlags
+}
+
+var _ webauthn.User = (*user)(nil)
+
+func NewWebAuthnUser(ctx context.Context, u *user_model.User, defaultAuthFlags ...protocol.AuthenticatorFlags) webauthn.User {
+	return &user{ctx: ctx, User: u, defaultAuthFlags: util.OptionalArg(defaultAuthFlags)}
+}
+
+// WebAuthnID implements the webauthn.User interface
+func (u *user) WebAuthnID() []byte {
+	id := make([]byte, 8)
+	binary.PutVarint(id, u.User.ID)
+	return id
+}
+
+// WebAuthnName implements the webauthn.User interface
+func (u *user) WebAuthnName() string {
+	return util.IfZero(u.User.LoginName, u.User.Name)
+}
+
+// WebAuthnDisplayName implements the webauthn.User interface
+func (u *user) WebAuthnDisplayName() string {
+	return u.User.DisplayName()
+}
+
+// WebAuthnCredentials implements the webauthn.User interface
+func (u *user) WebAuthnCredentials() []webauthn.Credential {
+	dbCreds, err := auth.GetWebAuthnCredentialsByUID(u.ctx, u.User.ID)
+	if err != nil {
+		return nil
+	}
+	return dbCreds.ToCredentials(u.defaultAuthFlags)
+}