vikunja-api/pkg/modules/avatar/gravatar/gravatar.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 gravatar
import (
"context"
"io/ioutil"
"net/http"
"strconv"
"time"
"code.vikunja.io/api/pkg/config"
"code.vikunja.io/api/pkg/log"
"code.vikunja.io/api/pkg/user"
"code.vikunja.io/api/pkg/utils"
)
type avatar struct {
content []byte
loadedAt time.Time
}
// Provider is the gravatar provider
type Provider struct {
}
// avatars is a global map which contains cached avatars of the users
var avatars map[string]*avatar
func init() {
avatars = make(map[string]*avatar)
}
// GetAvatar implements getting the avatar for the user
func (g *Provider) GetAvatar(user *user.User, size int64) ([]byte, string, error) {
sizeString := strconv.FormatInt(size, 10)
cacheKey := user.Username + "_" + sizeString
a, exists := avatars[cacheKey]
var needsRefetch bool
if exists {
// elaped is alway < 0 so the next check would always succeed.
// To have it make sense, we flip that.
elapsed := time.Until(a.loadedAt) * -1
needsRefetch = elapsed > time.Duration(config.AvatarGravaterExpiration.GetInt64())*time.Second
if needsRefetch {
log.Debugf("Refetching avatar for user %d after %v", user.ID, elapsed)
} else {
log.Debugf("Serving avatar for user %d from cache", user.ID)
}
}
if !exists || needsRefetch {
log.Debugf("Gravatar for user %d with size %d not cached, requesting from gravatar...", user.ID, size)
req, err := http.NewRequestWithContext(context.Background(), http.MethodGet, "https://www.gravatar.com/avatar/"+utils.Md5String(user.Email)+"?s="+sizeString+"&d=mp", nil)
if err != nil {
return nil, "", err
}
resp, err := http.DefaultClient.Do(req)
if err != nil {
return nil, "", err
}
defer resp.Body.Close()
avatarContent, err := ioutil.ReadAll(resp.Body)
if err != nil {
return nil, "", err
}
avatars[cacheKey] = &avatar{
content: avatarContent,
loadedAt: time.Now(),
}
}
return avatars[cacheKey].content, "image/jpg", nil
}