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