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https://github.com/superseriousbusiness/gotosocial.git
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fd670c6a27* [feature] Use ETag for robots.txt to prevent mishaps * check incoming if-none-match header
77 lines
2.3 KiB
Go
77 lines
2.3 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 robots
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import (
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"net/http"
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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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"github.com/superseriousbusiness/gotosocial/internal/config"
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)
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type Module struct{}
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func New() *Module {
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return &Module{}
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}
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func (m *Module) Route(attachHandler func(method string, path string, f ...gin.HandlerFunc) gin.IRoutes) {
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// Serve different robots.txt file depending on instance
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// stats mode: Don't disallow scraping nodeinfo if admin
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// has opted in to serving accurate stats there. In all
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// other cases, disallow scraping nodeinfo.
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var handler gin.HandlerFunc
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if config.GetInstanceStatsMode() == config.InstanceStatsModeServe {
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handler = m.robotsGETHandler
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} else {
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handler = m.robotsGETHandlerDisallowNodeInfo
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}
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// Attach handler at empty path as this
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// is already grouped under /robots.txt.
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attachHandler(http.MethodGet, "", handler)
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}
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func (m *Module) robotsGETHandler(c *gin.Context) {
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const ETag = "\"" + apiutil.RobotsTxtETag + "\""
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c.Header("ETag", ETag)
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if c.Request.Header.Get("If-None-Match") == ETag {
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// Cached.
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c.AbortWithStatus(http.StatusNotModified)
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return
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}
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// Not cached, serve.
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c.String(http.StatusOK, apiutil.RobotsTxt)
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}
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func (m *Module) robotsGETHandlerDisallowNodeInfo(c *gin.Context) {
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const ETag = "\"" + apiutil.RobotsTxtDisallowNodeInfoETag + "\""
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c.Header("ETag", ETag)
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if c.Request.Header.Get("If-None-Match") == ETag {
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// Cached.
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c.AbortWithStatus(http.StatusNotModified)
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return
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}
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// Not cached, serve.
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c.String(http.StatusOK, apiutil.RobotsTxtDisallowNodeInfo)
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}
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