2021-05-08 12:25:55 +00:00
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/*
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GoToSocial
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2023-01-05 11:43:00 +00:00
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Copyright (C) 2021-2023 GoToSocial Authors admin@gotosocial.org
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2021-05-08 12:25:55 +00:00
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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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2022-12-21 10:17:43 +00:00
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"bytes"
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2022-06-08 18:38:03 +00:00
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"fmt"
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2022-12-21 10:17:43 +00:00
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"io"
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2021-05-08 12:25:55 +00:00
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"net/http"
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2022-07-30 12:42:47 +00:00
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"strconv"
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2021-05-08 12:25:55 +00:00
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"github.com/gin-gonic/gin"
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2023-01-02 12:10:50 +00:00
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apimodel "github.com/superseriousbusiness/gotosocial/internal/api/model"
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apiutil "github.com/superseriousbusiness/gotosocial/internal/api/util"
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"github.com/superseriousbusiness/gotosocial/internal/gtserror"
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2022-07-19 08:47:55 +00:00
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"github.com/superseriousbusiness/gotosocial/internal/log"
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2021-05-08 12:25:55 +00:00
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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 *Module) 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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apiutil.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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apiutil.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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apiutil.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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apiutil.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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apiutil.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, &apimodel.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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apiutil.ErrorHandler(c, errWithCode, m.processor.InstanceGet)
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return
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}
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2022-02-19 10:44:56 +00:00
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defer func() {
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// close content when we're done
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if content.Content != nil {
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if err := content.Content.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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2022-09-19 11:43:22 +00:00
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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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2021-12-11 16:50:00 +00:00
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// TODO: if the requester only accepts text/html we should try to serve them *something*.
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2021-05-10 14:29:05 +00:00
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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 := apiutil.NegotiateAccept(c, apiutil.MIME(content.ContentType))
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if err != nil {
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apiutil.ErrorHandler(c, gtserror.NewErrorNotAcceptable(err, err.Error()), m.processor.InstanceGet)
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return
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}
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2023-01-02 12:10:50 +00:00
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// if this is a head request, just return info + throw the reader away
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if c.Request.Method == http.MethodHead {
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c.Header("Content-Type", format)
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c.Header("Content-Length", strconv.FormatInt(content.ContentLength, 10))
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c.Status(http.StatusOK)
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return
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}
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2023-01-11 11:13:13 +00:00
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// create a "slurp" buffer ;)
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b := make([]byte, 64)
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// Try read the first 64 bytes into memory, to try return a more useful "not found" error.
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if _, err := io.ReadFull(content.Content, b); err != nil &&
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(err != io.ErrUnexpectedEOF && err != io.EOF) {
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err = fmt.Errorf("ServeFile: error reading from content: %w", err)
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apiutil.ErrorHandler(c, gtserror.NewErrorNotFound(err, err.Error()), m.processor.InstanceGet)
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return
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}
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// we're good, return the slurped bytes + the rest of the content
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c.DataFromReader(http.StatusOK, content.ContentLength, format, io.MultiReader(
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bytes.NewReader(b), content.Content,
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), nil)
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}
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