feat: Backend i18n

backend/common/core/deps.py

@@ -1,7 +1,7 @@
 from typing import Annotated
 
 import jwt
-from fastapi import Depends, HTTPException, status
+from fastapi import Depends, HTTPException, Request, status
 # from fastapi.security import OAuth2PasswordBearer
 from jwt.exceptions import InvalidTokenError
 from pydantic import ValidationError
@@ -13,6 +13,7 @@ from common.core import security
 from common.core.config import settings
 from common.core.db import get_session
 from apps.system.models.user import UserModel
+from common.utils.locale import I18n
 reusable_oauth2 = XOAuth2PasswordBearer(
     tokenUrl=f"{settings.API_V1_STR}/login/access-token"
 )
@@ -22,7 +23,11 @@ reusable_oauth2 = XOAuth2PasswordBearer(
 
 SessionDep = Annotated[Session, Depends(get_session)]
 TokenDep = Annotated[str, Depends(reusable_oauth2)]
+i18n = I18n()
+async def get_i18n(request: Request):
+    return i18n(request)
 
+Trans = Annotated[I18n, Depends(get_i18n)]
 async def get_current_user(session: SessionDep, token: TokenDep) -> BaseUserDTO:
     try:
         payload = jwt.decode(

backend/common/utils/locale.py

@@ -0,0 +1,46 @@
+from pathlib import Path
+import json
+from typing import Dict, Optional
+from fastapi import Request
+
+class I18n:
+    def __init__(self, locale_dir: str = "locales"):
+        self.locale_dir = Path(locale_dir)
+        self.translations: Dict[str, Dict[str, str]] = {}
+        self.load_translations()
+
+    def load_translations(self):
+       
+        if not self.locale_dir.exists():
+            self.locale_dir.mkdir()
+            return
+
+        for lang_file in self.locale_dir.glob("*.json"):
+            with open(lang_file, 'r', encoding='utf-8') as f:
+                self.translations[lang_file.stem.lower()] = json.load(f)
+
+    def get_language(self, request: Request) -> str:
+        accept_language = request.headers.get('accept-language', 'en')
+        primary_lang = accept_language.split(',')[0].lower()
+        
+        return primary_lang if primary_lang in self.translations else 'zh-cn'
+
+    def __call__(self, request: Request) -> 'I18nHelper':
+        return I18nHelper(self, request)
+
+class I18nHelper:
+    def __init__(self, i18n: I18n, request: Request):
+        self.i18n = i18n
+        self.request = request
+        self.lang = i18n.get_language(request)
+
+    def __call__(self, key: str, **kwargs) -> str:
+        lang_data = self.i18n.translations.get(self.lang, {})
+        text = lang_data.get(key, key)  # 找不到则返回原key
+        
+        if kwargs:
+            try:
+                return text.format(**kwargs)
+            except (KeyError, ValueError):
+                return text
+        return text