1 files changed, 285 insertions, 0 deletions
diff --git a/internal/processing/media.go b/internal/processing/media.go
new file mode 100644
index 000000000..255f49067
--- /dev/null
+++ b/internal/processing/media.go
@@ -0,0 +1,285 @@
+/*
+   GoToSocial
+   Copyright (C) 2021 GoToSocial Authors admin@gotosocial.org
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Affero General Public License as published by
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU Affero General Public License for more details.
+
+   You should have received a copy of the GNU Affero General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+package processing
+
+import (
+	"bytes"
+	"errors"
+	"fmt"
+	"io"
+	"strconv"
+	"strings"
+
+	apimodel "github.com/superseriousbusiness/gotosocial/internal/api/model"
+	"github.com/superseriousbusiness/gotosocial/internal/db"
+	"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
+	"github.com/superseriousbusiness/gotosocial/internal/media"
+	"github.com/superseriousbusiness/gotosocial/internal/oauth"
+)
+
+func (p *processor) MediaCreate(authed *oauth.Auth, form *apimodel.AttachmentRequest) (*apimodel.Attachment, error) {
+	// First check this user/account is permitted to create media
+	// There's no point continuing otherwise.
+	//
+	// TODO: move this check to the oauth.Authed function and do it for all accounts
+	if authed.User.Disabled || !authed.User.Approved || !authed.Account.SuspendedAt.IsZero() {
+		return nil, errors.New("not authorized to post new media")
+	}
+
+	// open the attachment and extract the bytes from it
+	f, err := form.File.Open()
+	if err != nil {
+		return nil, fmt.Errorf("error opening attachment: %s", err)
+	}
+	buf := new(bytes.Buffer)
+	size, err := io.Copy(buf, f)
+	if err != nil {
+		return nil, fmt.Errorf("error reading attachment: %s", err)
+
+	}
+	if size == 0 {
+		return nil, errors.New("could not read provided attachment: size 0 bytes")
+	}
+
+	// allow the mediaHandler to work its magic of processing the attachment bytes, and putting them in whatever storage backend we're using
+	attachment, err := p.mediaHandler.ProcessAttachment(buf.Bytes(), authed.Account.ID, "")
+	if err != nil {
+		return nil, fmt.Errorf("error reading attachment: %s", err)
+	}
+
+	// now we need to add extra fields that the attachment processor doesn't know (from the form)
+	// TODO: handle this inside mediaHandler.ProcessAttachment (just pass more params to it)
+
+	// first description
+	attachment.Description = form.Description
+
+	// now parse the focus parameter
+	focusx, focusy, err := parseFocus(form.Focus)
+	if err != nil {
+		return nil, err
+	}
+	attachment.FileMeta.Focus.X = focusx
+	attachment.FileMeta.Focus.Y = focusy
+
+	// prepare the frontend representation now -- if there are any errors here at least we can bail without
+	// having already put something in the database and then having to clean it up again (eugh)
+	mastoAttachment, err := p.tc.AttachmentToMasto(attachment)
+	if err != nil {
+		return nil, fmt.Errorf("error parsing media attachment to frontend type: %s", err)
+	}
+
+	// now we can confidently put the attachment in the database
+	if err := p.db.Put(attachment); err != nil {
+		return nil, fmt.Errorf("error storing media attachment in db: %s", err)
+	}
+
+	return &mastoAttachment, nil
+}
+
+func (p *processor) MediaGet(authed *oauth.Auth, mediaAttachmentID string) (*apimodel.Attachment, ErrorWithCode) {
+	attachment := &gtsmodel.MediaAttachment{}
+	if err := p.db.GetByID(mediaAttachmentID, attachment); err != nil {
+		if _, ok := err.(db.ErrNoEntries); ok {
+			// attachment doesn't exist
+			return nil, NewErrorNotFound(errors.New("attachment doesn't exist in the db"))
+		}
+		return nil, NewErrorNotFound(fmt.Errorf("db error getting attachment: %s", err))
+	}
+
+	if attachment.AccountID != authed.Account.ID {
+		return nil, NewErrorNotFound(errors.New("attachment not owned by requesting account"))
+	}
+
+	a, err := p.tc.AttachmentToMasto(attachment)
+	if err != nil {
+		return nil, NewErrorNotFound(fmt.Errorf("error converting attachment: %s", err))
+	}
+
+	return &a, nil
+}
+
+func (p *processor) MediaUpdate(authed *oauth.Auth, mediaAttachmentID string, form *apimodel.AttachmentUpdateRequest) (*apimodel.Attachment, ErrorWithCode) {
+	attachment := &gtsmodel.MediaAttachment{}
+	if err := p.db.GetByID(mediaAttachmentID, attachment); err != nil {
+		if _, ok := err.(db.ErrNoEntries); ok {
+			// attachment doesn't exist
+			return nil, NewErrorNotFound(errors.New("attachment doesn't exist in the db"))
+		}
+		return nil, NewErrorNotFound(fmt.Errorf("db error getting attachment: %s", err))
+	}
+
+	if attachment.AccountID != authed.Account.ID {
+		return nil, NewErrorNotFound(errors.New("attachment not owned by requesting account"))
+	}
+
+	if form.Description != nil {
+		attachment.Description = *form.Description
+		if err := p.db.UpdateByID(mediaAttachmentID, attachment); err != nil {
+			return nil, NewErrorInternalError(fmt.Errorf("database error updating description: %s", err))
+		}
+	}
+
+	if form.Focus != nil {
+		focusx, focusy, err := parseFocus(*form.Focus)
+		if err != nil {
+			return nil, NewErrorBadRequest(err)
+		}
+		attachment.FileMeta.Focus.X = focusx
+		attachment.FileMeta.Focus.Y = focusy
+		if err := p.db.UpdateByID(mediaAttachmentID, attachment); err != nil {
+			return nil, NewErrorInternalError(fmt.Errorf("database error updating focus: %s", err))
+		}
+	}
+
+	a, err := p.tc.AttachmentToMasto(attachment)
+	if err != nil {
+		return nil, NewErrorNotFound(fmt.Errorf("error converting attachment: %s", err))
+	}
+
+	return &a, nil
+}
+
+func (p *processor) FileGet(authed *oauth.Auth, form *apimodel.GetContentRequestForm) (*apimodel.Content, error) {
+	// parse the form fields
+	mediaSize, err := media.ParseMediaSize(form.MediaSize)
+	if err != nil {
+		return nil, NewErrorNotFound(fmt.Errorf("media size %s not valid", form.MediaSize))
+	}
+
+	mediaType, err := media.ParseMediaType(form.MediaType)
+	if err != nil {
+		return nil, NewErrorNotFound(fmt.Errorf("media type %s not valid", form.MediaType))
+	}
+
+	spl := strings.Split(form.FileName, ".")
+	if len(spl) != 2 || spl[0] == "" || spl[1] == "" {
+		return nil, NewErrorNotFound(fmt.Errorf("file name %s not parseable", form.FileName))
+	}
+	wantedMediaID := spl[0]
+
+	// get the account that owns the media and make sure it's not suspended
+	acct := &gtsmodel.Account{}
+	if err := p.db.GetByID(form.AccountID, acct); err != nil {
+		return nil, NewErrorNotFound(fmt.Errorf("account with id %s could not be selected from the db: %s", form.AccountID, err))
+	}
+	if !acct.SuspendedAt.IsZero() {
+		return nil, NewErrorNotFound(fmt.Errorf("account with id %s is suspended", form.AccountID))
+	}
+
+	// make sure the requesting account and the media account don't block each other
+	if authed.Account != nil {
+		blocked, err := p.db.Blocked(authed.Account.ID, form.AccountID)
+		if err != nil {
+			return nil, NewErrorNotFound(fmt.Errorf("block status could not be established between accounts %s and %s: %s", form.AccountID, authed.Account.ID, err))
+		}
+		if blocked {
+			return nil, NewErrorNotFound(fmt.Errorf("block exists between accounts %s and %s", form.AccountID, authed.Account.ID))
+		}
+	}
+
+	// the way we store emojis is a little different from the way we store other attachments,
+	// so we need to take different steps depending on the media type being requested
+	content := &apimodel.Content{}
+	var storagePath string
+	switch mediaType {
+	case media.Emoji:
+		e := &gtsmodel.Emoji{}
+		if err := p.db.GetByID(wantedMediaID, e); err != nil {
+			return nil, NewErrorNotFound(fmt.Errorf("emoji %s could not be taken from the db: %s", wantedMediaID, err))
+		}
+		if e.Disabled {
+			return nil, NewErrorNotFound(fmt.Errorf("emoji %s has been disabled", wantedMediaID))
+		}
+		switch mediaSize {
+		case media.Original:
+			content.ContentType = e.ImageContentType
+			storagePath = e.ImagePath
+		case media.Static:
+			content.ContentType = e.ImageStaticContentType
+			storagePath = e.ImageStaticPath
+		default:
+			return nil, NewErrorNotFound(fmt.Errorf("media size %s not recognized for emoji", mediaSize))
+		}
+	case media.Attachment, media.Header, media.Avatar:
+		a := &gtsmodel.MediaAttachment{}
+		if err := p.db.GetByID(wantedMediaID, a); err != nil {
+			return nil, NewErrorNotFound(fmt.Errorf("attachment %s could not be taken from the db: %s", wantedMediaID, err))
+		}
+		if a.AccountID != form.AccountID {
+			return nil, NewErrorNotFound(fmt.Errorf("attachment %s is not owned by %s", wantedMediaID, form.AccountID))
+		}
+		switch mediaSize {
+		case media.Original:
+			content.ContentType = a.File.ContentType
+			storagePath = a.File.Path
+		case media.Small:
+			content.ContentType = a.Thumbnail.ContentType
+			storagePath = a.Thumbnail.Path
+		default:
+			return nil, NewErrorNotFound(fmt.Errorf("media size %s not recognized for attachment", mediaSize))
+		}
+	}
+
+	bytes, err := p.storage.RetrieveFileFrom(storagePath)
+	if err != nil {
+		return nil, NewErrorNotFound(fmt.Errorf("error retrieving from storage: %s", err))
+	}
+
+	content.ContentLength = int64(len(bytes))
+	content.Content = bytes
+	return content, nil
+}
+
+func parseFocus(focus string) (focusx, focusy float32, err error) {
+	if focus == "" {
+		return
+	}
+	spl := strings.Split(focus, ",")
+	if len(spl) != 2 {
+		err = fmt.Errorf("improperly formatted focus %s", focus)
+		return
+	}
+	xStr := spl[0]
+	yStr := spl[1]
+	if xStr == "" || yStr == "" {
+		err = fmt.Errorf("improperly formatted focus %s", focus)
+		return
+	}
+	fx, err := strconv.ParseFloat(xStr, 32)
+	if err != nil {
+		err = fmt.Errorf("improperly formatted focus %s: %s", focus, err)
+		return
+	}
+	if fx > 1 || fx < -1 {
+		err = fmt.Errorf("improperly formatted focus %s", focus)
+		return
+	}
+	focusx = float32(fx)
+	fy, err := strconv.ParseFloat(yStr, 32)
+	if err != nil {
+		err = fmt.Errorf("improperly formatted focus %s: %s", focus, err)
+		return
+	}
+	if fy > 1 || fy < -1 {
+		err = fmt.Errorf("improperly formatted focus %s", focus)
+		return
+	}
+	focusy = float32(fy)
+	return
+}