145 lines
4.3 KiB
Go
145 lines
4.3 KiB
Go
// Vikunja is a to-do list application to facilitate your life.
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// Copyright 2018-present 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 Affero 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 Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <https://www.gnu.org/licenses/>.
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package gravatar
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import (
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"context"
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"encoding/base64"
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"fmt"
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"io"
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"net/http"
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"strconv"
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"strings"
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"time"
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"code.vikunja.io/api/pkg/config"
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"code.vikunja.io/api/pkg/log"
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"code.vikunja.io/api/pkg/modules/keyvalue"
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"code.vikunja.io/api/pkg/user"
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"code.vikunja.io/api/pkg/utils"
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"golang.org/x/sync/singleflight"
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)
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type avatar struct {
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Content []byte `json:"content"`
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MimeType string `json:"mime_type"`
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LoadedAt time.Time `json:"loaded_at"`
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}
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// Provider is the gravatar provider
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type Provider struct {
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}
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var gravatarFetchGroup singleflight.Group
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// FlushCache removes all gravatar cache entries for a user
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func (g *Provider) FlushCache(u *user.User) error {
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return keyvalue.DelPrefix(keyPrefix + u.Username + "_")
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}
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const keyPrefix = "gravatar_avatar_"
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// GetAvatar implements getting the avatar for the user
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func (g *Provider) GetAvatar(user *user.User, size int64) ([]byte, string, error) {
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sizeString := strconv.FormatInt(size, 10)
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cacheKey := keyPrefix + user.Username + "_" + sizeString
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var av avatar
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exists, err := keyvalue.GetWithValue(cacheKey, &av)
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if err != nil {
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log.Errorf("Error retrieving gravatar from keyvalue store: %s", err)
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}
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if exists {
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elapsed := time.Since(av.LoadedAt)
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needsRefetch := elapsed > time.Duration(config.AvatarGravaterExpiration.GetInt64())*time.Second
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if needsRefetch {
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log.Debugf("Refetching avatar for user %d after %v", user.ID, elapsed)
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} else {
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log.Debugf("Serving avatar for user %d from cache", user.ID)
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return av.Content, av.MimeType, nil
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}
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}
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result, err, _ := gravatarFetchGroup.Do(cacheKey, func() (interface{}, error) {
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cached, cacheErr := keyvalue.GetWithValue(cacheKey, &av)
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if cacheErr != nil {
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log.Errorf("Error retrieving gravatar from keyvalue store: %s", cacheErr)
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}
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if cached && !g.avatarExpired(av) {
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log.Debugf("Serving avatar for user %d from cache", user.ID)
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return av, nil
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}
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log.Debugf("Gravatar for user %d with size %d not cached, requesting from gravatar...", user.ID, size)
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req, err := http.NewRequestWithContext(context.Background(), http.MethodGet, config.AvatarGravatarBaseURL.GetString()+"/avatar/"+utils.Md5String(strings.ToLower(user.Email))+"?s="+sizeString+"&d=mp", nil)
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if err != nil {
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return nil, err
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}
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resp, err := (&http.Client{Timeout: 5 * time.Second}).Do(req) // #nosec G704 -- URL is from config (AvatarGravatarBaseURL)
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if err != nil {
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return nil, err
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}
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defer resp.Body.Close()
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avatarContent, err := io.ReadAll(resp.Body)
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if err != nil {
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return nil, err
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}
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mimeType := "image/jpeg"
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if contentType := resp.Header.Get("Content-Type"); contentType != "" {
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mimeType = contentType
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}
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av = avatar{
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Content: avatarContent,
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MimeType: mimeType,
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LoadedAt: time.Now(),
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}
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if err := keyvalue.Put(cacheKey, av); err != nil {
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log.Errorf("Error storing gravatar in keyvalue store: %s", err)
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}
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return av, nil
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})
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if err != nil {
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return nil, "", err
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}
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av = result.(avatar)
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return av.Content, av.MimeType, nil
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}
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// AsDataURI returns a base64 encoded data URI for the gravatar
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func (g *Provider) AsDataURI(user *user.User, size int64) (string, error) {
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avatarData, mimeType, err := g.GetAvatar(user, size)
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if err != nil {
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return "", err
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}
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// Encode the avatar data as base64 and create a data URI
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base64Data := base64.StdEncoding.EncodeToString(avatarData)
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dataURI := fmt.Sprintf("data:%s;base64,%s", mimeType, base64Data)
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return dataURI, nil
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}
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func (g *Provider) avatarExpired(av avatar) bool {
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return time.Since(av.LoadedAt) > time.Duration(config.AvatarGravaterExpiration.GetInt64())*time.Second
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}
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