272 lines
11 KiB
Go
272 lines
11 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 media
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import (
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"bufio"
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"context"
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"fmt"
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"io"
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"net/url"
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"strings"
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apimodel "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/gtsmodel"
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"github.com/superseriousbusiness/gotosocial/internal/media"
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)
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func (p *processor) GetFile(ctx context.Context, account *gtsmodel.Account, form *apimodel.GetContentRequestForm) (*apimodel.Content, gtserror.WithCode) {
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// parse the form fields
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mediaSize, err := media.ParseMediaSize(form.MediaSize)
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if err != nil {
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return nil, gtserror.NewErrorNotFound(fmt.Errorf("media size %s not valid", form.MediaSize))
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}
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mediaType, err := media.ParseMediaType(form.MediaType)
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if err != nil {
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return nil, gtserror.NewErrorNotFound(fmt.Errorf("media type %s not valid", form.MediaType))
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}
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spl := strings.Split(form.FileName, ".")
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if len(spl) != 2 || spl[0] == "" || spl[1] == "" {
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return nil, gtserror.NewErrorNotFound(fmt.Errorf("file name %s not parseable", form.FileName))
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}
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wantedMediaID := spl[0]
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expectedAccountID := form.AccountID
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// get the account that owns the media and make sure it's not suspended
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acct, err := p.db.GetAccountByID(ctx, expectedAccountID)
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if err != nil {
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return nil, gtserror.NewErrorNotFound(fmt.Errorf("account with id %s could not be selected from the db: %s", expectedAccountID, err))
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}
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if !acct.SuspendedAt.IsZero() {
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return nil, gtserror.NewErrorNotFound(fmt.Errorf("account with id %s is suspended", expectedAccountID))
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}
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// make sure the requesting account and the media account don't block each other
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if account != nil {
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blocked, err := p.db.IsBlocked(ctx, account.ID, expectedAccountID, true)
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if err != nil {
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return nil, gtserror.NewErrorNotFound(fmt.Errorf("block status could not be established between accounts %s and %s: %s", expectedAccountID, account.ID, err))
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}
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if blocked {
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return nil, gtserror.NewErrorNotFound(fmt.Errorf("block exists between accounts %s and %s", expectedAccountID, account.ID))
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}
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}
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// the way we store emojis is a little different from the way we store other attachments,
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// so we need to take different steps depending on the media type being requested
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switch mediaType {
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case media.TypeEmoji:
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return p.getEmojiContent(ctx, wantedMediaID, mediaSize)
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case media.TypeAttachment, media.TypeHeader, media.TypeAvatar:
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return p.getAttachmentContent(ctx, account, wantedMediaID, expectedAccountID, mediaSize)
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default:
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return nil, gtserror.NewErrorNotFound(fmt.Errorf("media type %s not recognized", mediaType))
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}
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}
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func (p *processor) getAttachmentContent(ctx context.Context, requestingAccount *gtsmodel.Account, wantedMediaID string, expectedAccountID string, mediaSize media.Size) (*apimodel.Content, gtserror.WithCode) {
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attachmentContent := &apimodel.Content{}
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var storagePath string
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// retrieve attachment from the database and do basic checks on it
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a, err := p.db.GetAttachmentByID(ctx, wantedMediaID)
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if err != nil {
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return nil, gtserror.NewErrorNotFound(fmt.Errorf("attachment %s could not be taken from the db: %s", wantedMediaID, err))
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}
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if a.AccountID != expectedAccountID {
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return nil, gtserror.NewErrorNotFound(fmt.Errorf("attachment %s is not owned by %s", wantedMediaID, expectedAccountID))
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}
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// get file information from the attachment depending on the requested media size
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switch mediaSize {
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case media.SizeOriginal:
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attachmentContent.ContentType = a.File.ContentType
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attachmentContent.ContentLength = int64(a.File.FileSize)
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storagePath = a.File.Path
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case media.SizeSmall:
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attachmentContent.ContentType = a.Thumbnail.ContentType
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attachmentContent.ContentLength = int64(a.Thumbnail.FileSize)
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storagePath = a.Thumbnail.Path
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default:
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return nil, gtserror.NewErrorNotFound(fmt.Errorf("media size %s not recognized for attachment", mediaSize))
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}
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// if we have the media cached on our server already, we can now simply return it from storage
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if *a.Cached {
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return p.retrieveFromStorage(ctx, storagePath, attachmentContent)
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}
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// if we don't have it cached, then we can assume two things:
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// 1. this is remote media, since local media should never be uncached
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// 2. we need to fetch it again using a transport and the media manager
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remoteMediaIRI, err := url.Parse(a.RemoteURL)
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if err != nil {
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return nil, gtserror.NewErrorNotFound(fmt.Errorf("error parsing remote media iri %s: %s", a.RemoteURL, err))
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}
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// use an empty string as requestingUsername to use the instance account, unless the request for this
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// media has been http signed, then use the requesting account to make the request to remote server
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var requestingUsername string
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if requestingAccount != nil {
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requestingUsername = requestingAccount.Username
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}
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var data media.DataFunc
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var postDataCallback media.PostDataCallbackFunc
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if mediaSize == media.SizeSmall {
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// if it's the thumbnail that's requested then the user will have to wait a bit while we process the
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// large version and derive a thumbnail from it, so use the normal recaching procedure: fetch the media,
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// process it, then return the thumbnail data
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data = func(innerCtx context.Context) (io.Reader, int, error) {
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transport, err := p.transportController.NewTransportForUsername(innerCtx, requestingUsername)
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if err != nil {
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return nil, 0, err
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}
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return transport.DereferenceMedia(innerCtx, remoteMediaIRI)
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}
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} else {
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// if it's the full-sized version being requested, we can cheat a bit by streaming data to the user as
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// it's retrieved from the remote server, using tee; this saves the user from having to wait while
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// we process the media on our side
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//
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// this looks a bit like this:
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//
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// http fetch buffered pipe
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// remote server ------------> data function ----------------> api caller
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// |
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// | tee
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// |
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// ▼
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// instance storage
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// Buffer each end of the pipe, so that if the caller drops the connection during the flow, the tee
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// reader can continue without having to worry about tee-ing into a closed or blocked pipe.
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pipeReader, pipeWriter := io.Pipe()
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bufferedWriter := bufio.NewWriterSize(pipeWriter, int(attachmentContent.ContentLength))
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bufferedReader := bufio.NewReaderSize(pipeReader, int(attachmentContent.ContentLength))
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// the caller will read from the buffered reader, so it doesn't matter if they drop out without reading everything
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attachmentContent.Content = bufferedReader
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data = func(innerCtx context.Context) (io.Reader, int, error) {
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transport, err := p.transportController.NewTransportForUsername(innerCtx, requestingUsername)
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if err != nil {
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return nil, 0, err
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}
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readCloser, fileSize, err := transport.DereferenceMedia(innerCtx, remoteMediaIRI)
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if err != nil {
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return nil, 0, err
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}
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// Make a TeeReader so that everything read from the readCloser by the media manager will be written into the bufferedWriter.
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// We wrap this in a teeReadCloser which implements io.ReadCloser, so that whoever uses the teeReader can close the readCloser
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// when they're done with it.
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trc := teeReadCloser{
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teeReader: io.TeeReader(readCloser, bufferedWriter),
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close: readCloser.Close,
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}
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return trc, fileSize, nil
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}
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// close the pipewriter after data has been piped into it, so the reader on the other side doesn't block;
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// we don't need to close the reader here because that's the caller's responsibility
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postDataCallback = func(innerCtx context.Context) error {
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// flush the buffered writer into the buffer of the reader...
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if err := bufferedWriter.Flush(); err != nil {
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return err
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}
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// and close the underlying pipe writer
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if err := pipeWriter.Close(); err != nil {
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return err
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}
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return nil
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}
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}
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// put the media recached in the queue
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processingMedia, err := p.mediaManager.RecacheMedia(ctx, data, postDataCallback, wantedMediaID)
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if err != nil {
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return nil, gtserror.NewErrorNotFound(fmt.Errorf("error recaching media: %s", err))
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}
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// if it's the thumbnail, stream the processed thumbnail from storage, after waiting for processing to finish
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if mediaSize == media.SizeSmall {
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// below function call blocks until all processing on the attachment has finished...
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if _, err := processingMedia.LoadAttachment(ctx); err != nil {
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return nil, gtserror.NewErrorNotFound(fmt.Errorf("error loading recached attachment: %s", err))
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}
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// ... so now we can safely return it
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return p.retrieveFromStorage(ctx, storagePath, attachmentContent)
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}
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return attachmentContent, nil
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}
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func (p *processor) getEmojiContent(ctx context.Context, wantedEmojiID string, emojiSize media.Size) (*apimodel.Content, gtserror.WithCode) {
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emojiContent := &apimodel.Content{}
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var storagePath string
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e, err := p.db.GetEmojiByID(ctx, wantedEmojiID)
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if err != nil {
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return nil, gtserror.NewErrorNotFound(fmt.Errorf("emoji %s could not be taken from the db: %s", wantedEmojiID, err))
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}
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if *e.Disabled {
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return nil, gtserror.NewErrorNotFound(fmt.Errorf("emoji %s has been disabled", wantedEmojiID))
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}
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switch emojiSize {
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case media.SizeOriginal:
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emojiContent.ContentType = e.ImageContentType
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emojiContent.ContentLength = int64(e.ImageFileSize)
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storagePath = e.ImagePath
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case media.SizeStatic:
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emojiContent.ContentType = e.ImageStaticContentType
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emojiContent.ContentLength = int64(e.ImageStaticFileSize)
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storagePath = e.ImageStaticPath
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default:
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return nil, gtserror.NewErrorNotFound(fmt.Errorf("media size %s not recognized for emoji", emojiSize))
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}
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return p.retrieveFromStorage(ctx, storagePath, emojiContent)
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}
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func (p *processor) retrieveFromStorage(ctx context.Context, storagePath string, content *apimodel.Content) (*apimodel.Content, gtserror.WithCode) {
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if url := p.storage.URL(ctx, storagePath); url != nil {
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content.URL = url
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return content, nil
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}
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reader, err := p.storage.GetStream(ctx, storagePath)
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if err != nil {
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return nil, gtserror.NewErrorNotFound(fmt.Errorf("error retrieving from storage: %s", err))
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}
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content.Content = reader
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return content, nil
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}
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