1 files changed, 115 insertions, 0 deletions
diff --git a/models/user/avatar.go b/models/user/avatar.go
new file mode 100644
index 0000000..c6937d7
--- /dev/null
+++ b/models/user/avatar.go
@@ -0,0 +1,115 @@
+// Copyright 2020 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package user
+
+import (
+	"context"
+	"crypto/md5"
+	"fmt"
+	"image/png"
+	"io"
+	"strings"
+
+	"code.gitea.io/gitea/models/avatars"
+	"code.gitea.io/gitea/models/db"
+	"code.gitea.io/gitea/modules/avatar"
+	"code.gitea.io/gitea/modules/log"
+	"code.gitea.io/gitea/modules/setting"
+	"code.gitea.io/gitea/modules/storage"
+)
+
+// CustomAvatarRelativePath returns user custom avatar relative path.
+func (u *User) CustomAvatarRelativePath() string {
+	return u.Avatar
+}
+
+// GenerateRandomAvatar generates a random avatar for user.
+func GenerateRandomAvatar(ctx context.Context, u *User) error {
+	seed := u.Email
+	if len(seed) == 0 {
+		seed = u.Name
+	}
+
+	img, err := avatar.RandomImage([]byte(seed))
+	if err != nil {
+		return fmt.Errorf("RandomImage: %w", err)
+	}
+
+	u.Avatar = avatars.HashEmail(seed)
+
+	// Don't share the images so that we can delete them easily
+	if err := storage.SaveFrom(storage.Avatars, u.CustomAvatarRelativePath(), func(w io.Writer) error {
+		if err := png.Encode(w, img); err != nil {
+			log.Error("Encode: %v", err)
+		}
+		return err
+	}); err != nil {
+		return fmt.Errorf("Failed to create dir %s: %w", u.CustomAvatarRelativePath(), err)
+	}
+
+	if _, err := db.GetEngine(ctx).ID(u.ID).Cols("avatar").Update(u); err != nil {
+		return err
+	}
+
+	log.Info("New random avatar created: %d", u.ID)
+	return nil
+}
+
+// AvatarLinkWithSize returns a link to the user's avatar with size. size <= 0 means default size
+func (u *User) AvatarLinkWithSize(ctx context.Context, size int) string {
+	if u.IsGhost() {
+		return avatars.DefaultAvatarLink()
+	}
+
+	useLocalAvatar := false
+	autoGenerateAvatar := false
+
+	disableGravatar := setting.Config().Picture.DisableGravatar.Value(ctx)
+
+	switch {
+	case u.UseCustomAvatar:
+		useLocalAvatar = true
+	case disableGravatar, setting.OfflineMode:
+		useLocalAvatar = true
+		autoGenerateAvatar = true
+	}
+
+	if useLocalAvatar {
+		if u.Avatar == "" && autoGenerateAvatar {
+			if err := GenerateRandomAvatar(ctx, u); err != nil {
+				log.Error("GenerateRandomAvatar: %v", err)
+			}
+		}
+		if u.Avatar == "" {
+			return avatars.DefaultAvatarLink()
+		}
+		return avatars.GenerateUserAvatarImageLink(u.Avatar, size)
+	}
+	return avatars.GenerateEmailAvatarFastLink(ctx, u.AvatarEmail, size)
+}
+
+// AvatarLink returns the full avatar link with http host
+func (u *User) AvatarLink(ctx context.Context) string {
+	link := u.AvatarLinkWithSize(ctx, 0)
+	if !strings.HasPrefix(link, "//") && !strings.Contains(link, "://") {
+		return setting.AppURL + strings.TrimPrefix(link, setting.AppSubURL+"/")
+	}
+	return link
+}
+
+// IsUploadAvatarChanged returns true if the current user's avatar would be changed with the provided data
+func (u *User) IsUploadAvatarChanged(data []byte) bool {
+	if !u.UseCustomAvatar || len(u.Avatar) == 0 {
+		return true
+	}
+	avatarID := fmt.Sprintf("%x", md5.Sum([]byte(fmt.Sprintf("%d-%x", u.ID, md5.Sum(data)))))
+	return u.Avatar != avatarID
+}
+
+// ExistsWithAvatarAtStoragePath returns true if there is a user with this Avatar
+func ExistsWithAvatarAtStoragePath(ctx context.Context, storagePath string) (bool, error) {
+	// See func (u *User) CustomAvatarRelativePath()
+	// u.Avatar is used directly as the storage path - therefore we can check for existence directly using the path
+	return db.GetEngine(ctx).Where("`avatar`=?", storagePath).Exist(new(User))
+}