104 lines
3.6 KiB
Go
104 lines
3.6 KiB
Go
/*
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GoToSocial
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Copyright (C) 2021 GoToSocial Authors admin@gotosocial.org
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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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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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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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*/
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package fileserver
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import (
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"bytes"
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"net/http"
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"github.com/gin-gonic/gin"
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"github.com/sirupsen/logrus"
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"github.com/superseriousbusiness/gotosocial/internal/api/model"
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"github.com/superseriousbusiness/gotosocial/internal/oauth"
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)
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// ServeFile is for serving attachments, headers, and avatars to the requester from instance storage.
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//
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// Note: to mitigate scraping attempts, no information should be given out on a bad request except "404 page not found".
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// Don't give away account ids or media ids or anything like that; callers shouldn't be able to infer anything.
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func (m *FileServer) ServeFile(c *gin.Context) {
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l := m.log.WithFields(logrus.Fields{
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"func": "ServeFile",
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"request_uri": c.Request.RequestURI,
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"user_agent": c.Request.UserAgent(),
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"origin_ip": c.ClientIP(),
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})
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l.Trace("received request")
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authed, err := oauth.Authed(c, false, false, false, false)
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if err != nil {
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c.String(http.StatusNotFound, "404 page not found")
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return
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}
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// 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:
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// "https://example.org/fileserver/[ACCOUNT_ID]/[MEDIA_TYPE]/[MEDIA_SIZE]/[FILE_NAME]"
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// "FILE_NAME" consists of two parts, the attachment's database id, a period, and the file extension.
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accountID := c.Param(AccountIDKey)
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if accountID == "" {
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l.Debug("missing accountID from request")
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c.String(http.StatusNotFound, "404 page not found")
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return
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}
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mediaType := c.Param(MediaTypeKey)
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if mediaType == "" {
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l.Debug("missing mediaType from request")
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c.String(http.StatusNotFound, "404 page not found")
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return
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}
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mediaSize := c.Param(MediaSizeKey)
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if mediaSize == "" {
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l.Debug("missing mediaSize from request")
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c.String(http.StatusNotFound, "404 page not found")
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return
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}
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fileName := c.Param(FileNameKey)
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if fileName == "" {
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l.Debug("missing fileName from request")
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c.String(http.StatusNotFound, "404 page not found")
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return
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}
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content, err := m.processor.FileGet(authed, &model.GetContentRequestForm{
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AccountID: accountID,
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MediaType: mediaType,
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MediaSize: mediaSize,
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FileName: fileName,
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})
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if err != nil {
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l.Debug(err)
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c.String(http.StatusNotFound, "404 page not found")
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return
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}
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// TODO: do proper content negotiation here -- if the requester only accepts text/html we should try to serve them *something*
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// This is mostly needed because when sharing a link to a gts-hosted file on something like mastodon, the masto servers will
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// attempt to look up the content to provide a preview of the link, and they ask for text/html.
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if c.NegotiateFormat(content.ContentType) == "" {
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l.Debugf("couldn't negotiate content for Accept headers %+v: we have content type %s", c.Request.Header.Get("Accepted"), content.ContentType)
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c.AbortWithStatus(http.StatusNotAcceptable)
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return
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}
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c.DataFromReader(http.StatusOK, content.ContentLength, content.ContentType, bytes.NewReader(content.Content), nil)
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}
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