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forgejo/models/avatars/avatar.go
Lunny Xiao 91fa0eb9d7
Avoid warning for system setting when start up ()
Partially fix 

After  merged, it always has a warning log like `cannot get
context cache` when starting up. This should not affect any real life
but it's annoying. This PR will fix the problem. That means when
starting up, getting the system settings will not try from the cache but
will read from the database directly.

---------

Co-authored-by: Lauris BH <lauris@nix.lv>
2023-02-24 18:23:13 +08:00

196 lines
6.5 KiB
Go

// Copyright 2021 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package avatars
import (
"context"
"net/url"
"path"
"strconv"
"strings"
"sync"
"code.gitea.io/gitea/models/db"
system_model "code.gitea.io/gitea/models/system"
"code.gitea.io/gitea/modules/base"
"code.gitea.io/gitea/modules/cache"
"code.gitea.io/gitea/modules/log"
"code.gitea.io/gitea/modules/setting"
)
const (
// DefaultAvatarClass is the default class of a rendered avatar
DefaultAvatarClass = "ui avatar gt-vm"
// DefaultAvatarPixelSize is the default size in pixels of a rendered avatar
DefaultAvatarPixelSize = 28
)
// EmailHash represents a pre-generated hash map (mainly used by LibravatarURL, it queries email server's DNS records)
type EmailHash struct {
Hash string `xorm:"pk varchar(32)"`
Email string `xorm:"UNIQUE NOT NULL"`
}
func init() {
db.RegisterModel(new(EmailHash))
}
var (
defaultAvatarLink string
once sync.Once
)
// DefaultAvatarLink the default avatar link
func DefaultAvatarLink() string {
once.Do(func() {
u, err := url.Parse(setting.AppSubURL)
if err != nil {
log.Error("Can not parse AppSubURL: %v", err)
return
}
u.Path = path.Join(u.Path, "/assets/img/avatar_default.png")
defaultAvatarLink = u.String()
})
return defaultAvatarLink
}
// HashEmail hashes email address to MD5 string. https://en.gravatar.com/site/implement/hash/
func HashEmail(email string) string {
return base.EncodeMD5(strings.ToLower(strings.TrimSpace(email)))
}
// GetEmailForHash converts a provided md5sum to the email
func GetEmailForHash(md5Sum string) (string, error) {
return cache.GetString("Avatar:"+md5Sum, func() (string, error) {
emailHash := EmailHash{
Hash: strings.ToLower(strings.TrimSpace(md5Sum)),
}
_, err := db.GetEngine(db.DefaultContext).Get(&emailHash)
return emailHash.Email, err
})
}
// LibravatarURL returns the URL for the given email. Slow due to the DNS lookup.
// This function should only be called if a federated avatar service is enabled.
func LibravatarURL(email string) (*url.URL, error) {
urlStr, err := system_model.LibravatarService.FromEmail(email)
if err != nil {
log.Error("LibravatarService.FromEmail(email=%s): error %v", email, err)
return nil, err
}
u, err := url.Parse(urlStr)
if err != nil {
log.Error("Failed to parse libravatar url(%s): error %v", urlStr, err)
return nil, err
}
return u, nil
}
// saveEmailHash returns an avatar link for a provided email,
// the email and hash are saved into database, which will be used by GetEmailForHash later
func saveEmailHash(email string) string {
lowerEmail := strings.ToLower(strings.TrimSpace(email))
emailHash := HashEmail(lowerEmail)
_, _ = cache.GetString("Avatar:"+emailHash, func() (string, error) {
emailHash := &EmailHash{
Email: lowerEmail,
Hash: emailHash,
}
// OK we're going to open a session just because I think that that might hide away any problems with postgres reporting errors
if err := db.WithTx(db.DefaultContext, func(ctx context.Context) error {
has, err := db.GetEngine(ctx).Where("email = ? AND hash = ?", emailHash.Email, emailHash.Hash).Get(new(EmailHash))
if has || err != nil {
// Seriously we don't care about any DB problems just return the lowerEmail - we expect the transaction to fail most of the time
return nil
}
_, _ = db.GetEngine(ctx).Insert(emailHash)
return nil
}); err != nil {
// Seriously we don't care about any DB problems just return the lowerEmail - we expect the transaction to fail most of the time
return lowerEmail, nil
}
return lowerEmail, nil
})
return emailHash
}
// GenerateUserAvatarFastLink returns a fast link (302) to the user's avatar: "/user/avatar/${User.Name}/${size}"
func GenerateUserAvatarFastLink(userName string, size int) string {
if size < 0 {
size = 0
}
return setting.AppSubURL + "/user/avatar/" + url.PathEscape(userName) + "/" + strconv.Itoa(size)
}
// GenerateUserAvatarImageLink returns a link for `User.Avatar` image file: "/avatars/${User.Avatar}"
func GenerateUserAvatarImageLink(userAvatar string, size int) string {
if size > 0 {
return setting.AppSubURL + "/avatars/" + url.PathEscape(userAvatar) + "?size=" + strconv.Itoa(size)
}
return setting.AppSubURL + "/avatars/" + url.PathEscape(userAvatar)
}
// generateRecognizedAvatarURL generate a recognized avatar (Gravatar/Libravatar) URL, it modifies the URL so the parameter is passed by a copy
func generateRecognizedAvatarURL(u url.URL, size int) string {
urlQuery := u.Query()
urlQuery.Set("d", "identicon")
if size > 0 {
urlQuery.Set("s", strconv.Itoa(size))
}
u.RawQuery = urlQuery.Encode()
return u.String()
}
// generateEmailAvatarLink returns a email avatar link.
// if final is true, it may use a slow path (eg: query DNS).
// if final is false, it always uses a fast path.
func generateEmailAvatarLink(ctx context.Context, email string, size int, final bool) string {
email = strings.TrimSpace(email)
if email == "" {
return DefaultAvatarLink()
}
enableFederatedAvatar := system_model.GetSettingWithCacheBool(ctx, system_model.KeyPictureEnableFederatedAvatar)
var err error
if enableFederatedAvatar && system_model.LibravatarService != nil {
emailHash := saveEmailHash(email)
if final {
// for final link, we can spend more time on slow external query
var avatarURL *url.URL
if avatarURL, err = LibravatarURL(email); err != nil {
return DefaultAvatarLink()
}
return generateRecognizedAvatarURL(*avatarURL, size)
}
// for non-final link, we should return fast (use a 302 redirection link)
urlStr := setting.AppSubURL + "/avatar/" + url.PathEscape(emailHash)
if size > 0 {
urlStr += "?size=" + strconv.Itoa(size)
}
return urlStr
}
disableGravatar := system_model.GetSettingWithCacheBool(ctx, system_model.KeyPictureDisableGravatar)
if !disableGravatar {
// copy GravatarSourceURL, because we will modify its Path.
avatarURLCopy := *system_model.GravatarSourceURL
avatarURLCopy.Path = path.Join(avatarURLCopy.Path, HashEmail(email))
return generateRecognizedAvatarURL(avatarURLCopy, size)
}
return DefaultAvatarLink()
}
// GenerateEmailAvatarFastLink returns a avatar link (fast, the link may be a delegated one: "/avatar/${hash}")
func GenerateEmailAvatarFastLink(ctx context.Context, email string, size int) string {
return generateEmailAvatarLink(ctx, email, size, false)
}
// GenerateEmailAvatarFinalLink returns a avatar final link (maybe slow)
func GenerateEmailAvatarFinalLink(ctx context.Context, email string, size int) string {
return generateEmailAvatarLink(ctx, email, size, true)
}