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"
"image"
"image/png"
"io/ioutil"
"strconv"
"code.vikunja.io/api/pkg/files"
"code.vikunja.io/api/pkg/log"
"code.vikunja.io/api/pkg/modules/keyvalue"
e "code.vikunja.io/api/pkg/modules/keyvalue/error"
"code.vikunja.io/api/pkg/user"
"github.com/disintegration/imaging"
)
// 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) {
cacheKey := "avatar_upload_" + strconv.Itoa(int(u.ID))
ai, err := keyvalue.Get(cacheKey)
if err != nil && !e.IsErrValueNotFoundForKey(err) {
return nil, "", err
}
var cached map[int64][]byte
if ai != nil {
cached = ai.(map[int64][]byte)
}
if err != nil && e.IsErrValueNotFoundForKey(err) {
// Nothing ever cached for this user so we need to create the size map to avoid panics
cached = make(map[int64][]byte)
} else {
a := ai.(map[int64][]byte)
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 {
cached = 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)
if err != nil {
return nil, "", err
}
cached[size] = avatar
err = keyvalue.Put(cacheKey, cached)
return avatar, f.Mime, err
}
// InvalidateCache invalidates the avatar cache for a user
func InvalidateCache(u *user.User) {
if err := keyvalue.Del("avatar_upload_" + strconv.Itoa(int(u.ID))); err != nil {
log.Errorf("Could not invalidate upload avatar cache for user %d, error was %s", u.ID, err)
}
}