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// Copyright 2021 The Gitea Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
package avatars
import (
"context"
"net/url"
"path"
"strconv"
"strings"
"sync"
"code.gitea.io/gitea/models/db"
"code.gitea.io/gitea/modules/base"
"code.gitea.io/gitea/modules/cache"
"code.gitea.io/gitea/modules/log"
"code.gitea.io/gitea/modules/setting"
)
// DefaultAvatarPixelSize is the default size in pixels of a rendered avatar
const 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 := setting.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(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/${User.Avatar}"
func GenerateUserAvatarImageLink(userAvatar string, size int) string {
if size > 0 {
return setting.AppSubURL + "/avatars/" + url.PathEscape(userAvatar) + "?size=" + strconv.Itoa(size)
}
return setting.AppSubURL + "/avatars/" + url.PathEscape(userAvatar)
}
// generateRecognizedAvatarURL generate a recognized avatar (Gravatar/Libravatar) URL, it modifies the URL so the parameter is passed by a copy
func generateRecognizedAvatarURL(u url.URL, size int) string {
urlQuery := u.Query()
urlQuery.Set("d", "identicon")
if size > 0 {
urlQuery.Set("s", strconv.Itoa(size))
}
u.RawQuery = urlQuery.Encode()
return u.String()
}
// generateEmailAvatarLink returns a email avatar link.
// if final is true, it may use a slow path (eg: query DNS).
// if final is false, it always uses a fast path.
func generateEmailAvatarLink(email string, size int, final bool) string {
email = strings.TrimSpace(email)
if email == "" {
return DefaultAvatarLink()
}
var err error
if setting.EnableFederatedAvatar && setting.LibravatarService != nil {
emailHash := saveEmailHash(email)
if final {
// for final link, we can spend more time on slow external query
var avatarURL *url.URL
if avatarURL, err = LibravatarURL(email); err != nil {
return DefaultAvatarLink()
}
return generateRecognizedAvatarURL(*avatarURL, size)
}
// for non-final link, we should return fast (use a 302 redirection link)
urlStr := setting.AppSubURL + "/avatar/" + url.PathEscape(emailHash)
if size > 0 {
urlStr += "?size=" + strconv.Itoa(size)
}
return urlStr
} else if !setting.DisableGravatar {
// copy GravatarSourceURL, because we will modify its Path.
avatarURLCopy := *setting.GravatarSourceURL
avatarURLCopy.Path = path.Join(avatarURLCopy.Path, HashEmail(email))
return generateRecognizedAvatarURL(avatarURLCopy, size)
}
return DefaultAvatarLink()
}
// GenerateEmailAvatarFastLink returns a avatar link (fast, the link may be a delegated one: "/avatar/${hash}")
func GenerateEmailAvatarFastLink(email string, size int) string {
return generateEmailAvatarLink(email, size, false)
}
// GenerateEmailAvatarFinalLink returns a avatar final link (maybe slow)
func GenerateEmailAvatarFinalLink(email string, size int) string {
return generateEmailAvatarLink(email, size, true)
}
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