118 lines
4.3 KiB
Go
118 lines
4.3 KiB
Go
/*
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GoToSocial
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Copyright (C) 2021-2022 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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"fmt"
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"io"
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"net/http"
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"github.com/gin-gonic/gin"
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"github.com/superseriousbusiness/gotosocial/internal/api"
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"github.com/superseriousbusiness/gotosocial/internal/api/model"
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"github.com/superseriousbusiness/gotosocial/internal/gtserror"
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"github.com/superseriousbusiness/gotosocial/internal/log"
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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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authed, err := oauth.Authed(c, false, false, false, false)
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if err != nil {
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api.ErrorHandler(c, gtserror.NewErrorNotFound(err), m.processor.InstanceGet)
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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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err := fmt.Errorf("missing %s from request", AccountIDKey)
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api.ErrorHandler(c, gtserror.NewErrorNotFound(err), m.processor.InstanceGet)
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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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err := fmt.Errorf("missing %s from request", MediaTypeKey)
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api.ErrorHandler(c, gtserror.NewErrorNotFound(err), m.processor.InstanceGet)
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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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err := fmt.Errorf("missing %s from request", MediaSizeKey)
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api.ErrorHandler(c, gtserror.NewErrorNotFound(err), m.processor.InstanceGet)
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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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err := fmt.Errorf("missing %s from request", FileNameKey)
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api.ErrorHandler(c, gtserror.NewErrorNotFound(err), m.processor.InstanceGet)
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return
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}
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content, errWithCode := m.processor.FileGet(c.Request.Context(), 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 errWithCode != nil {
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api.ErrorHandler(c, errWithCode, m.processor.InstanceGet)
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return
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}
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if content.URL != nil {
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c.Redirect(http.StatusFound, content.URL.String())
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return
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}
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defer func() {
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// if the content is a ReadCloser, close it when we're done
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if closer, ok := content.Content.(io.ReadCloser); ok {
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if err := closer.Close(); err != nil {
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log.Errorf("ServeFile: error closing readcloser: %s", err)
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}
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}
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}()
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// TODO: 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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format, err := api.NegotiateAccept(c, api.MIME(content.ContentType))
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if err != nil {
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api.ErrorHandler(c, gtserror.NewErrorNotAcceptable(err, err.Error()), m.processor.InstanceGet)
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return
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}
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c.DataFromReader(http.StatusOK, content.ContentLength, format, content.Content, map[string]string{
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// since we'll never host different files at the same
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// URL (bc the ULIDs are generated per piece of media),
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// it's sensible and safe to use a long cache here, so
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// that clients don't keep fetching files over + over again
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"Cache-Control": "max-age=604800",
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})
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}
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