gotosocial/internal/api/client/fileserver/servefile.go

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/*
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 fileserver
import (
"bytes"
"net/http"
"github.com/gin-gonic/gin"
"github.com/sirupsen/logrus"
"github.com/superseriousbusiness/gotosocial/internal/api/model"
"github.com/superseriousbusiness/gotosocial/internal/oauth"
)
// ServeFile is for serving attachments, headers, and avatars to the requester from instance storage.
//
// Note: to mitigate scraping attempts, no information should be given out on a bad request except "404 page not found".
// Don't give away account ids or media ids or anything like that; callers shouldn't be able to infer anything.
func (m *FileServer) ServeFile(c *gin.Context) {
l := logrus.WithFields(logrus.Fields{
"func": "ServeFile",
"request_uri": c.Request.RequestURI,
"user_agent": c.Request.UserAgent(),
"origin_ip": c.ClientIP(),
})
l.Trace("received request")
authed, err := oauth.Authed(c, false, false, false, false)
if err != nil {
c.String(http.StatusNotFound, "404 page not found")
return
}
// We use request params to check what to pull out of the database/storage so check everything. A request URL should be formatted as follows:
// "https://example.org/fileserver/[ACCOUNT_ID]/[MEDIA_TYPE]/[MEDIA_SIZE]/[FILE_NAME]"
// "FILE_NAME" consists of two parts, the attachment's database id, a period, and the file extension.
accountID := c.Param(AccountIDKey)
if accountID == "" {
l.Debug("missing accountID from request")
c.String(http.StatusNotFound, "404 page not found")
return
}
mediaType := c.Param(MediaTypeKey)
if mediaType == "" {
l.Debug("missing mediaType from request")
c.String(http.StatusNotFound, "404 page not found")
return
}
mediaSize := c.Param(MediaSizeKey)
if mediaSize == "" {
l.Debug("missing mediaSize from request")
c.String(http.StatusNotFound, "404 page not found")
return
}
fileName := c.Param(FileNameKey)
if fileName == "" {
l.Debug("missing fileName from request")
c.String(http.StatusNotFound, "404 page not found")
return
}
content, err := m.processor.FileGet(c.Request.Context(), authed, &model.GetContentRequestForm{
AccountID: accountID,
MediaType: mediaType,
MediaSize: mediaSize,
FileName: fileName,
})
if err != nil {
l.Debug(err)
c.String(http.StatusNotFound, "404 page not found")
return
}
// TODO: do proper content negotiation here -- if the requester only accepts text/html we should try to serve them *something*
// This is mostly needed because when sharing a link to a gts-hosted file on something like mastodon, the masto servers will
// attempt to look up the content to provide a preview of the link, and they ask for text/html.
if c.NegotiateFormat(content.ContentType) == "" {
l.Debugf("couldn't negotiate content for Accept headers %+v: we have content type %s", c.Request.Header.Get("Accepted"), content.ContentType)
c.AbortWithStatus(http.StatusNotAcceptable)
return
}
c.DataFromReader(http.StatusOK, content.ContentLength, content.ContentType, bytes.NewReader(content.Content), nil)
}