refactor: unify OAuth providers with i18n support

- Introduce Provider interface pattern for standard OAuth protocols
- Create unified controller/oauth.go with common OAuth logic
- Add OAuthError type for translatable error messages
- Add i18n keys and translations (zh/en) for OAuth messages
- Use common.ApiErrorI18n/ApiSuccessI18n for consistent responses
- Preserve backward compatibility for existing routes and data

i18n/keys.go

@@ -264,9 +264,20 @@ const (
 
 // OAuth related messages
 const (
-	MsgOAuthInvalidCode = "oauth.invalid_code"
-	MsgOAuthGetUserErr  = "oauth.get_user_error"
-	MsgOAuthAccountUsed = "oauth.account_used"
+	MsgOAuthInvalidCode          = "oauth.invalid_code"
+	MsgOAuthGetUserErr           = "oauth.get_user_error"
+	MsgOAuthAccountUsed          = "oauth.account_used"
+	MsgOAuthUnknownProvider      = "oauth.unknown_provider"
+	MsgOAuthStateInvalid         = "oauth.state_invalid"
+	MsgOAuthNotEnabled           = "oauth.not_enabled"
+	MsgOAuthUserDeleted          = "oauth.user_deleted"
+	MsgOAuthUserBanned           = "oauth.user_banned"
+	MsgOAuthBindSuccess          = "oauth.bind_success"
+	MsgOAuthAlreadyBound         = "oauth.already_bound"
+	MsgOAuthConnectFailed        = "oauth.connect_failed"
+	MsgOAuthTokenFailed          = "oauth.token_failed"
+	MsgOAuthUserInfoEmpty        = "oauth.user_info_empty"
+	MsgOAuthTrustLevelLow        = "oauth.trust_level_low"
 )
 
 // Model layer error messages (for translation in controller)

i18n/locales/en.yaml

@@ -223,6 +223,17 @@ ability.repair_running: "A repair task is already running, please try again late
 oauth.invalid_code: "Invalid authorization code"
 oauth.get_user_error: "Failed to get user information"
 oauth.account_used: "This account has been bound to another user"
+oauth.unknown_provider: "Unknown OAuth provider"
+oauth.state_invalid: "State parameter is empty or mismatched"
+oauth.not_enabled: "{{.Provider}} login and registration has not been enabled by administrator"
+oauth.user_deleted: "User has been deleted"
+oauth.user_banned: "User has been banned"
+oauth.bind_success: "Binding successful"
+oauth.already_bound: "This {{.Provider}} account has already been bound"
+oauth.connect_failed: "Unable to connect to {{.Provider}} server, please try again later"
+oauth.token_failed: "Failed to get token from {{.Provider}}, please check settings"
+oauth.user_info_empty: "{{.Provider}} returned empty user info, please check settings"
+oauth.trust_level_low: "Linux DO trust level does not meet the minimum required by administrator"
 
 # Model layer error messages
 redeem.failed: "Redemption failed, please try again later"

i18n/locales/zh.yaml

@@ -224,6 +224,17 @@ ability.repair_running: "已经有一个修复任务在运行中，请稍后再
 oauth.invalid_code: "无效的授权码"
 oauth.get_user_error: "获取用户信息失败"
 oauth.account_used: "该账户已被其他用户绑定"
+oauth.unknown_provider: "未知的 OAuth 提供商"
+oauth.state_invalid: "state 参数为空或不匹配"
+oauth.not_enabled: "管理员未开启通过 {{.Provider}} 登录以及注册"
+oauth.user_deleted: "用户已注销"
+oauth.user_banned: "用户已被封禁"
+oauth.bind_success: "绑定成功"
+oauth.already_bound: "该 {{.Provider}} 账户已被绑定"
+oauth.connect_failed: "无法连接至 {{.Provider}} 服务器，请稍后重试"
+oauth.token_failed: "{{.Provider}} 获取 Token 失败，请检查设置"
+oauth.user_info_empty: "{{.Provider}} 获取用户信息为空，请检查设置"
+oauth.trust_level_low: "Linux DO 信任等级未达到管理员设置的最低信任等级"
 
 # Model layer error messages
 redeem.failed: "兑换失败，请稍后重试"