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// GoToSocial
// Copyright (C) GoToSocial Authors admin@gotosocial.org
// SPDX-License-Identifier: AGPL-3.0-or-later
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package handlers
import (
"context"
"errors"
"net/http"
"net/url"
"slices"
"strings"
"code.superseriousbusiness.org/oauth2/v4"
oautherr "code.superseriousbusiness.org/oauth2/v4/errors"
"code.superseriousbusiness.org/oauth2/v4/manage"
"code.superseriousbusiness.org/oauth2/v4/server"
apiutil "github.com/superseriousbusiness/gotosocial/internal/api/util"
"github.com/superseriousbusiness/gotosocial/internal/db"
"github.com/superseriousbusiness/gotosocial/internal/gtscontext"
"github.com/superseriousbusiness/gotosocial/internal/gtserror"
"github.com/superseriousbusiness/gotosocial/internal/log"
"github.com/superseriousbusiness/gotosocial/internal/state"
)
// GetClientScopeHandler returns a handler for testing scope on a TokenGenerateRequest.
func GetClientScopeHandler(ctx context.Context, state *state.State) server.ClientScopeHandler {
return func(tgr *oauth2.TokenGenerateRequest) (allowed bool, err error) {
application, err := state.DB.GetApplicationByClientID(
gtscontext.SetBarebones(ctx),
tgr.ClientID,
)
if err != nil && !errors.Is(err, db.ErrNoEntries) {
log.Errorf(ctx, "database error getting application: %v", err)
return false, err
}
if application == nil {
err := gtserror.Newf("no application found with client id %s", tgr.ClientID)
return false, err
}
// Normalize scope.
if strings.TrimSpace(tgr.Scope) == "" {
tgr.Scope = "read"
}
// Make sure requested scopes are all
// within scopes permitted by application.
hasScopes := strings.Split(application.Scopes, " ")
wantsScopes := strings.Split(tgr.Scope, " ")
for _, wantsScope := range wantsScopes {
thisOK := slices.ContainsFunc(
hasScopes,
func(hasScope string) bool {
has := apiutil.Scope(hasScope)
wants := apiutil.Scope(wantsScope)
return has.Permits(wants)
},
)
if !thisOK {
// Requested unpermitted
// scope for this app.
return false, nil
}
}
// All OK.
return true, nil
}
}
func GetValidateURIHandler(ctx context.Context) manage.ValidateURIHandler {
return func(hasRedirects string, wantsRedirect string) error {
// Normalize the wantsRedirect URI
// string by parsing + reserializing.
wantsRedirectURI, err := url.Parse(wantsRedirect)
if err != nil {
return err
}
wantsRedirect = wantsRedirectURI.String()
// Redirect URIs are given to us as
// a list of URIs, newline-separated.
//
// They're already normalized on input so
// we don't need to parse + reserialize them.
//
// Ensure that one of them matches.
if slices.ContainsFunc(
strings.Split(hasRedirects, "\n"),
func(hasRedirect string) bool {
// Want an exact match.
// See: https://www.oauth.com/oauth2-servers/redirect-uris/redirect-uri-validation/
return wantsRedirect == hasRedirect
},
) {
return nil
}
return oautherr.ErrInvalidRedirectURI
}
}
func GetAuthorizeScopeHandler() server.AuthorizeScopeHandler {
return func(_ http.ResponseWriter, r *http.Request) (string, error) {
// Use provided scope or
// fall back to default "read".
scope := r.FormValue("scope")
if strings.TrimSpace(scope) == "" {
scope = "read"
}
return scope, nil
}
}
func GetInternalErrorHandler(ctx context.Context) server.InternalErrorHandler {
return func(err error) *oautherr.Response {
log.Errorf(ctx, "internal oauth error: %v", err)
return nil
}
}
func GetResponseErrorHandler(ctx context.Context) server.ResponseErrorHandler {
return func(re *oautherr.Response) {
log.Errorf(ctx, "internal response error: %v", re.Error)
}
}
func GetUserAuthorizationHandler() server.UserAuthorizationHandler {
return func(w http.ResponseWriter, r *http.Request) (string, error) {
userID := r.FormValue("userid")
if userID == "" {
return "", errors.New("userid was empty")
}
return userID, nil
}
}
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