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/*
GoToSocial
Copyright (C) 2021-2023 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 middleware
import (
"time"
"github.com/gin-contrib/cors"
"github.com/gin-gonic/gin"
)
// CORS returns a new gin middleware which allows CORS requests to be processed.
// This is necessary in order for web/browser-based clients like Pinafore to work.
func CORS() gin.HandlerFunc {
cfg := cors.Config{
// todo: use config to customize this
AllowAllOrigins: true,
// adds the following:
// "chrome-extension://"
// "safari-extension://"
// "moz-extension://"
// "ms-browser-extension://"
AllowBrowserExtensions: true,
AllowMethods: []string{
"POST",
"PUT",
"DELETE",
"GET",
"PATCH",
"OPTIONS",
},
AllowHeaders: []string{
// basic cors stuff
"Origin",
"Content-Length",
"Content-Type",
// needed to pass oauth bearer tokens
"Authorization",
// needed for websocket upgrade requests
"Upgrade",
"Sec-WebSocket-Extensions",
"Sec-WebSocket-Key",
"Sec-WebSocket-Protocol",
"Sec-WebSocket-Version",
"Connection",
},
AllowWebSockets: true,
ExposeHeaders: []string{
// needed for accessing next/prev links when making GET timeline requests
"Link",
// needed so clients can handle rate limits
"X-RateLimit-Reset",
"X-RateLimit-Limit",
"X-RateLimit-Remaining",
"X-Request-Id",
// websocket stuff
"Connection",
"Sec-WebSocket-Accept",
"Upgrade",
},
MaxAge: 2 * time.Minute,
}
return cors.New(cfg)
}
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