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baed591a1d
* [feature] Use `X-Robots-Tag` headers to instruct scrapers/crawlers * use switch for RobotsHeaders
68 lines
2.2 KiB
Go
68 lines
2.2 KiB
Go
// GoToSocial
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// Copyright (C) GoToSocial Authors admin@gotosocial.org
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// SPDX-License-Identifier: AGPL-3.0-or-later
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//
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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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//
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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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//
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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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package middleware
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import (
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"github.com/gin-gonic/gin"
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apiutil "github.com/superseriousbusiness/gotosocial/internal/api/util"
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)
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// RobotsHeaders adds robots directives to the X-Robots-Tag HTTP header.
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// https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-Robots-Tag
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//
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// If mode == "aiOnly" then only the noai and noimageai values will be set,
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// and other headers will be left alone (for route groups / handlers to set).
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//
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// If mode == "allowSome" then noai, noimageai, and some indexing will be set.
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//
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// If mode == "" then noai, noimageai, noindex, and nofollow will be set
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// (ie., as restrictive as possible).
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func RobotsHeaders(mode string) gin.HandlerFunc {
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const (
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key = "X-Robots-Tag"
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// Some AI scrapers respect the following tags
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// to opt-out of their crawling and datasets.
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// We add them regardless of allowSome.
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noai = "noai, noimageai"
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)
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switch mode {
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// Just set ai headers and
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// leave the other headers be.
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case "aiOnly":
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return func(c *gin.Context) {
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c.Writer.Header().Set(key, noai)
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}
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// Allow some limited indexing.
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case "allowSome":
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return func(c *gin.Context) {
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c.Writer.Header().Set(key, apiutil.RobotsDirectivesAllowSome)
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c.Writer.Header().Add(key, noai)
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}
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// Disallow indexing via noindex, nofollow.
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default:
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return func(c *gin.Context) {
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c.Writer.Header().Set(key, apiutil.RobotsDirectivesDisallow)
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c.Writer.Header().Add(key, noai)
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}
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}
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}
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