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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 "github.com/gin-gonic/gin"
// ExtraHeaders returns a new gin middleware which adds various extra headers to the response.
func ExtraHeaders() gin.HandlerFunc {
return func(c *gin.Context) {
// Inform all callers which server implementation this is.
c.Header("Server", "gotosocial")
// Prevent google chrome cohort tracking. Originally this was referred
// to as FlocBlock. Floc was replaced by Topics in 2022 and the spec says
// that interest-cohort will also block Topics (as of 2022-Nov).
//
// See: https://smartframe.io/blog/google-topics-api-everything-you-need-to-know
//
// See: https://github.com/patcg-individual-drafts/topics
c.Header("Permissions-Policy", "browsing-topics=()")
}
}
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