Make offline mode as default to no connect external avatar service by default (#28548)

To keep user's privacy, make offline mode as true by default.

Users can still change it from installation ui and app.ini

custom/conf/app.example.ini

@@ -234,7 +234,7 @@ RUN_USER = ; git
 ;MINIMUM_KEY_SIZE_CHECK = false
 ;;
 ;; Disable CDN even in "prod" mode
-;OFFLINE_MODE = false
+;OFFLINE_MODE = true
 ;;
 ;; TLS Settings: Either ACME or manual
 ;; (Other common TLS configuration are found before)

docs/content/administration/config-cheat-sheet.en-us.md

@@ -357,7 +357,7 @@ The following configuration set `Content-Type: application/vnd.android.package-a
 - `SSH_PER_WRITE_PER_KB_TIMEOUT`: **10s**: Timeout per Kb written to SSH connections.
 - `MINIMUM_KEY_SIZE_CHECK`: **true**: Indicate whether to check minimum key size with corresponding type.
 
-- `OFFLINE_MODE`: **false**: Disables use of CDN for static files and Gravatar for profile pictures.
+- `OFFLINE_MODE`: **true**: Disables use of CDN for static files and Gravatar for profile pictures.
 - `CERT_FILE`: **https/cert.pem**: Cert file path used for HTTPS. When chaining, the server certificate must come first, then intermediate CA certificates (if any). This is ignored if `ENABLE_ACME=true`. Paths are relative to `CUSTOM_PATH`.
 - `KEY_FILE`: **https/key.pem**: Key file path used for HTTPS. This is ignored if `ENABLE_ACME=true`. Paths are relative to `CUSTOM_PATH`.
 - `STATIC_ROOT_PATH`: **_`StaticRootPath`_**: Upper level of template and static files path.

docs/content/administration/config-cheat-sheet.zh-cn.md

@@ -346,7 +346,7 @@ menu:
 - `SSH_PER_WRITE_TIMEOUT`: **30s**：对 SSH 连接的任何写入设置超时。（将其设置为 -1 可以禁用所有超时。）
 - `SSH_PER_WRITE_PER_KB_TIMEOUT`: **10s**：对写入 SSH 连接的每 KB 设置超时。
 - `MINIMUM_KEY_SIZE_CHECK`: **true**：指示是否检查最小密钥大小与相应类型。
-- `OFFLINE_MODE`: **false**：禁用 CDN 用于静态文件和 Gravatar 用于个人资料图片。
+- `OFFLINE_MODE`: **true**：禁用 CDN 用于静态文件和 Gravatar 用于个人资料图片。
 - `CERT_FILE`: **https/cert.pem**：用于 HTTPS 的证书文件路径。在链接时，服务器证书必须首先出现，然后是中间 CA 证书（如果有）。如果 `ENABLE_ACME=true`，则此设置会被忽略。路径相对于 `CUSTOM_PATH`。
 - `KEY_FILE`: **https/key.pem**：用于 HTTPS 的密钥文件路径。如果 `ENABLE_ACME=true`，则此设置会被忽略。路径相对于 `CUSTOM_PATH`。
 - `STATIC_ROOT_PATH`: **_`StaticRootPath`_**：模板和静态文件路径的上一级。

modules/repository/commits_test.go

@@ -126,9 +126,10 @@ func TestPushCommits_AvatarLink(t *testing.T) {
 	}
 
 	setting.GravatarSource = "https://secure.gravatar.com/avatar"
+	setting.OfflineMode = true
 
 	assert.Equal(t,
-		"https://secure.gravatar.com/avatar/ab53a2911ddf9b4817ac01ddcd3d975f?d=identicon&s="+strconv.Itoa(28*setting.Avatar.RenderedSizeFactor),
+		"/avatars/avatar2?size="+strconv.Itoa(28*setting.Avatar.RenderedSizeFactor),
 		pushCommits.AvatarLink(db.DefaultContext, "user2@example.com"))
 
 	assert.Equal(t,

modules/setting/server.go

@@ -315,7 +315,7 @@ func loadServerFrom(rootCfg ConfigProvider) {
 	RedirectOtherPort = sec.Key("REDIRECT_OTHER_PORT").MustBool(false)
 	PortToRedirect = sec.Key("PORT_TO_REDIRECT").MustString("80")
 	RedirectorUseProxyProtocol = sec.Key("REDIRECTOR_USE_PROXY_PROTOCOL").MustBool(UseProxyProtocol)
-	OfflineMode = sec.Key("OFFLINE_MODE").MustBool()
+	OfflineMode = sec.Key("OFFLINE_MODE").MustBool(true)
 	if len(StaticRootPath) == 0 {
 		StaticRootPath = AppWorkPath
 	}