vikunja-api/pkg/modules/avatar/upload/upload.go

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// Vikunja is a to-do list application to facilitate your life.
// Copyright 2018-2020 Vikunja and contributors. All rights reserved.
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU 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 General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
package upload
import (
"bytes"
"code.vikunja.io/api/pkg/files"
"code.vikunja.io/api/pkg/log"
"code.vikunja.io/api/pkg/user"
"github.com/disintegration/imaging"
"image"
"image/png"
"io/ioutil"
"sync"
)
var (
// This is a map with a map so we're able to clear all cached avatar (in all sizes) for one user at once
// The first map has as key the user id, the second one has the size as key
resizedCache = map[int64]map[int64][]byte{}
resizedCacheLock = sync.Mutex{}
)
func init() {
resizedCache = make(map[int64]map[int64][]byte)
}
// Provider represents the upload avatar provider
type Provider struct {
}
// GetAvatar returns an uploaded user avatar
func (p *Provider) GetAvatar(u *user.User, size int64) (avatar []byte, mimeType string, err error) {
a, cached := resizedCache[u.ID]
if cached {
if a != nil && a[size] != nil {
log.Debugf("Serving uploaded avatar for user %d and size %d from cache.", u.ID, size)
return a[size], "", nil
}
// This means we have a map for the user, but nothing in it.
if a == nil {
resizedCache[u.ID] = make(map[int64][]byte)
}
} else {
// Nothing ever cached for this user so we need to create the size map to avoid panics
resizedCache[u.ID] = make(map[int64][]byte)
}
log.Debugf("Uploaded avatar for user %d and size %d not cached, resizing and caching.", u.ID, size)
// If we get this far, the avatar is either not cached at all or not in this size
f := &files.File{ID: u.AvatarFileID}
if err := f.LoadFileByID(); err != nil {
return nil, "", err
}
if err := f.LoadFileMetaByID(); err != nil {
return nil, "", err
}
img, _, err := image.Decode(f.File)
if err != nil {
return nil, "", err
}
resizedImg := imaging.Resize(img, 0, int(size), imaging.Lanczos)
buf := &bytes.Buffer{}
if err := png.Encode(buf, resizedImg); err != nil {
return nil, "", err
}
avatar, err = ioutil.ReadAll(buf)
resizedCacheLock.Lock()
resizedCache[u.ID][size] = avatar
resizedCacheLock.Unlock()
return avatar, f.Mime, err
}
// InvalidateCache invalidates the avatar cache for a user
func InvalidateCache(u *user.User) {
resizedCacheLock.Lock()
delete(resizedCache, u.ID)
resizedCacheLock.Unlock()
}