/*
   GoToSocial
   Copyright (C) 2021 GoToSocial Authors admin@gotosocial.org

   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 auth

import (
	"net/http"

	"github.com/superseriousbusiness/gotosocial/internal/api"
	"github.com/superseriousbusiness/gotosocial/internal/db"
	"github.com/superseriousbusiness/gotosocial/internal/oauth"
	"github.com/superseriousbusiness/gotosocial/internal/oidc"
	"github.com/superseriousbusiness/gotosocial/internal/router"
)

/* #nosec G101 */
const (
	// AuthSignInPath is the API path for users to sign in through
	AuthSignInPath = "/auth/sign_in"
	// OauthTokenPath is the API path to use for granting token requests to users with valid credentials
	OauthTokenPath = "/oauth/token"
	// OauthAuthorizePath is the API path for authorization requests (eg., authorize this app to act on my behalf as a user)
	OauthAuthorizePath = "/oauth/authorize"
	// CallbackPath is the API path for receiving callback tokens from external OIDC providers
	CallbackPath = oidc.CallbackPath

	callbackStateParam = "state"
	callbackCodeParam  = "code"

	sessionUserID       = "userid"
	sessionClientID     = "client_id"
	sessionRedirectURI  = "redirect_uri"
	sessionForceLogin   = "force_login"
	sessionResponseType = "response_type"
	sessionScope        = "scope"
	sessionState        = "state"
)

// Module implements the ClientAPIModule interface for
type Module struct {
	db     db.DB
	server oauth.Server
	idp    oidc.IDP
}

// New returns a new auth module
func New(db db.DB, server oauth.Server, idp oidc.IDP) api.ClientModule {
	return &Module{
		db:     db,
		server: server,
		idp:    idp,
	}
}

// Route satisfies the RESTAPIModule interface
func (m *Module) Route(s router.Router) error {
	s.AttachHandler(http.MethodGet, AuthSignInPath, m.SignInGETHandler)
	s.AttachHandler(http.MethodPost, AuthSignInPath, m.SignInPOSTHandler)

	s.AttachHandler(http.MethodPost, OauthTokenPath, m.TokenPOSTHandler)

	s.AttachHandler(http.MethodGet, OauthAuthorizePath, m.AuthorizeGETHandler)
	s.AttachHandler(http.MethodPost, OauthAuthorizePath, m.AuthorizePOSTHandler)

	s.AttachHandler(http.MethodGet, CallbackPath, m.CallbackGETHandler)
	return nil
}