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			113 lines
		
	
	
	
		
			3.6 KiB
		
	
	
	
		
			Go
		
	
	
	
	
	
/*
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   GoToSocial
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   Copyright (C) 2021-2023 GoToSocial Authors admin@gotosocial.org
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   This program is free software: you can redistribute it and/or modify
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   it under the terms of the GNU Affero General Public License as published by
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   the Free Software Foundation, either version 3 of the License, or
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   (at your option) any later version.
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   This program is distributed in the hope that it will be useful,
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   but WITHOUT ANY WARRANTY; without even the implied warranty of
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   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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   GNU Affero General Public License for more details.
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   You should have received a copy of the GNU Affero General Public License
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   along with this program.  If not, see <http://www.gnu.org/licenses/>.
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*/
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package auth
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import (
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	"context"
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	"errors"
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	"fmt"
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	"net/http"
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	"github.com/gin-contrib/sessions"
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	"github.com/gin-gonic/gin"
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	apimodel "github.com/superseriousbusiness/gotosocial/internal/api/model"
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	apiutil "github.com/superseriousbusiness/gotosocial/internal/api/util"
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	"github.com/superseriousbusiness/gotosocial/internal/config"
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	"github.com/superseriousbusiness/gotosocial/internal/db"
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	"github.com/superseriousbusiness/gotosocial/internal/gtserror"
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	"github.com/superseriousbusiness/gotosocial/internal/oauth"
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)
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func (m *Module) OobHandler(c *gin.Context) {
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	host := config.GetHost()
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	instance, errWithCode := m.processor.InstanceGet(c.Request.Context(), host)
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	if errWithCode != nil {
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		apiutil.ErrorHandler(c, errWithCode, m.processor.InstanceGet)
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		return
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	}
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	instanceGet := func(ctx context.Context, domain string) (*apimodel.Instance, gtserror.WithCode) {
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		return instance, nil
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	}
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	oobToken := c.Query("code")
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	if oobToken == "" {
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		err := errors.New("no 'code' query value provided in callback redirect")
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		apiutil.ErrorHandler(c, gtserror.NewErrorBadRequest(err, err.Error(), oauth.HelpfulAdvice), instanceGet)
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		return
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	}
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	s := sessions.Default(c)
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	errs := []string{}
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	scope, ok := s.Get(sessionScope).(string)
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	if !ok {
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		errs = append(errs, fmt.Sprintf("key %s was not found in session", sessionScope))
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	}
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	userID, ok := s.Get(sessionUserID).(string)
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	if !ok {
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		errs = append(errs, fmt.Sprintf("key %s was not found in session", sessionUserID))
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	}
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	if len(errs) != 0 {
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		errs = append(errs, oauth.HelpfulAdvice)
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		apiutil.ErrorHandler(c, gtserror.NewErrorBadRequest(errors.New("one or more missing keys on session during OobHandler"), errs...), m.processor.InstanceGet)
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		return
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	}
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	user, err := m.db.GetUserByID(c.Request.Context(), userID)
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	if err != nil {
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		m.clearSession(s)
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		safe := fmt.Sprintf("user with id %s could not be retrieved", userID)
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		var errWithCode gtserror.WithCode
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		if err == db.ErrNoEntries {
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			errWithCode = gtserror.NewErrorBadRequest(err, safe, oauth.HelpfulAdvice)
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		} else {
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			errWithCode = gtserror.NewErrorInternalError(err, safe, oauth.HelpfulAdvice)
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		}
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		apiutil.ErrorHandler(c, errWithCode, instanceGet)
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		return
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	}
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	acct, err := m.db.GetAccountByID(c.Request.Context(), user.AccountID)
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	if err != nil {
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		m.clearSession(s)
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		safe := fmt.Sprintf("account with id %s could not be retrieved", user.AccountID)
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		var errWithCode gtserror.WithCode
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		if err == db.ErrNoEntries {
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			errWithCode = gtserror.NewErrorBadRequest(err, safe, oauth.HelpfulAdvice)
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		} else {
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			errWithCode = gtserror.NewErrorInternalError(err, safe, oauth.HelpfulAdvice)
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		}
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		apiutil.ErrorHandler(c, errWithCode, instanceGet)
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		return
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	}
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	// we're done with the session now, so just clear it out
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	m.clearSession(s)
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	c.HTML(http.StatusOK, "oob.tmpl", gin.H{
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		"instance": instance,
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		"user":     acct.Username,
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		"oobToken": oobToken,
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		"scope":    scope,
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	})
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}
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