mirror of
https://github.com/superseriousbusiness/gotosocial.git
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5e2bf0bdca
* [chore] Remove years from all license headers Years or year ranges aren't required in license headers. Many projects have removed them in recent years and it avoids a bit of yearly toil. In many cases our copyright claim was also a bit dodgy since we added the 2021-2023 header to files created after 2021 but you can't claim copyright into the past that way. * [chore] Add license header check This ensures a license header is always added to any new file. This avoids maintainers/reviewers needing to remember to check for and ask for it in case a contribution doesn't include it. * [chore] Add missing license headers * [chore] Further updates to license header * Use the more common // indentend comment format * Remove the hack we had for the linter now that we use the // format * Add SPDX license identifier
253 lines
8.3 KiB
Go
253 lines
8.3 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 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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"strconv"
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"strings"
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"time"
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"codeberg.org/gruf/go-fastcopy"
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"github.com/gin-gonic/gin"
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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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"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 *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.InstanceGetV1)
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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.InstanceGetV1)
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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.InstanceGetV1)
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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.InstanceGetV1)
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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.InstanceGetV1)
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return
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}
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// Acquire context from gin request.
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ctx := c.Request.Context()
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content, errWithCode := m.processor.Media().GetFile(ctx, authed.Account, &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.InstanceGetV1)
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return
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}
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if content.URL != nil {
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// This is a non-local, non-proxied S3 file we're redirecting to.
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// Derive the max-age value from how long the link has left until
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// it expires.
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maxAge := int(time.Until(content.URL.Expiry).Seconds())
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c.Header("Cache-Control", "private,max-age="+strconv.Itoa(maxAge))
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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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// Close content when we're done, catch errors.
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if err := content.Content.Close(); err != nil {
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log.Errorf(ctx, "ServeFile: error closing readcloser: %s", err)
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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 := 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.InstanceGetV1)
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return
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}
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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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// Look for a provided range header.
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rng := c.GetHeader("Range")
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if rng == "" {
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// This is a simple query for the whole file, so do a read from whole reader.
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c.DataFromReader(http.StatusOK, content.ContentLength, format, content.Content, nil)
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return
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}
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// Set known content-type and serve range.
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c.Header("Content-Type", format)
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serveFileRange(
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c.Writer,
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c.Request,
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content.Content,
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rng,
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content.ContentLength,
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)
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}
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// serveFileRange serves the range of a file from a given source reader, without the
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// need for implementation of io.Seeker. Instead we read the first 'start' many bytes
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// into a discard reader. Code is adapted from https://codeberg.org/gruf/simplehttp.
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func serveFileRange(rw http.ResponseWriter, r *http.Request, src io.Reader, rng string, size int64) {
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var i int
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if i = strings.IndexByte(rng, '='); i < 0 {
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// Range must include a separating '=' to indicate start
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http.Error(rw, "Bad Range Header", http.StatusBadRequest)
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return
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}
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if rng[:i] != "bytes" {
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// We only support byte ranges in our implementation
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http.Error(rw, "Unsupported Range Unit", http.StatusBadRequest)
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return
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}
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// Reslice past '='
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rng = rng[i+1:]
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if i = strings.IndexByte(rng, '-'); i < 0 {
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// Range header must contain a beginning and end separated by '-'
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http.Error(rw, "Bad Range Header", http.StatusBadRequest)
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return
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}
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var (
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err error
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// default start + end ranges
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start, end = int64(0), size - 1
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// start + end range strings
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startRng, endRng string
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)
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if startRng = rng[:i]; len(startRng) > 0 {
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// Parse the start of this byte range
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start, err = strconv.ParseInt(startRng, 10, 64)
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if err != nil {
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http.Error(rw, "Bad Range Header", http.StatusBadRequest)
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return
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}
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if start < 0 {
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// This range starts *before* the file start, why did they send this lol
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rw.Header().Set("Content-Range", "bytes *"+strconv.FormatInt(size, 10))
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http.Error(rw, "Unsatisfiable Range", http.StatusRequestedRangeNotSatisfiable)
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return
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}
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} else {
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// No start supplied, implying file start
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startRng = "0"
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}
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if endRng = rng[i+1:]; len(endRng) > 0 {
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// Parse the end of this byte range
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end, err = strconv.ParseInt(endRng, 10, 64)
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if err != nil {
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http.Error(rw, "Bad Range Header", http.StatusBadRequest)
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return
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}
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if end > size {
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// This range exceeds length of the file, therefore unsatisfiable
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rw.Header().Set("Content-Range", "bytes *"+strconv.FormatInt(size, 10))
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http.Error(rw, "Unsatisfiable Range", http.StatusRequestedRangeNotSatisfiable)
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return
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}
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} else {
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// No end supplied, implying file end
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endRng = strconv.FormatInt(end, 10)
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}
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if start >= end {
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// This range starts _after_ their range end, unsatisfiable and nonsense!
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rw.Header().Set("Content-Range", "bytes *"+strconv.FormatInt(size, 10))
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http.Error(rw, "Unsatisfiable Range", http.StatusRequestedRangeNotSatisfiable)
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return
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}
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// Dump the first 'start' many bytes into the void...
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if _, err := fastcopy.CopyN(io.Discard, src, start); err != nil {
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log.Errorf(r.Context(), "error reading from source: %v", err)
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return
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}
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// Determine new content length
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// after slicing to given range.
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length := end - start + 1
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if end < size-1 {
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// Range end < file end, limit the reader
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src = io.LimitReader(src, length)
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}
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// Write the necessary length and range headers
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rw.Header().Set("Content-Range", "bytes "+startRng+"-"+endRng+"/"+strconv.FormatInt(size, 10))
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rw.Header().Set("Content-Length", strconv.FormatInt(length, 10))
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rw.WriteHeader(http.StatusPartialContent)
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// Read the "seeked" source reader into destination writer.
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if _, err := fastcopy.Copy(rw, src); err != nil {
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log.Errorf(r.Context(), "error reading from source: %v", err)
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return
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}
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}
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