Refactor: Implement uber-go/fx dependency injection

- Replace global variable pattern with proper dependency injection
- Add uber-go/fx for automatic dependency resolution
- Refactor all services and handlers to use constructor injection
- Eliminate fragile initialization order dependencies
- Improve testability and modularity
- Add structured logging with zap

Co-authored-by: Qwen-Coder <qwen-coder@alibabacloud.com>

internal/web/handlers/oauth.go

@@ -10,21 +10,25 @@ import (
 )
 
 type OauthLoginHandler struct {
-	Jwt               auth.JwtTokenGenerator
-	OauthLoginHandler *auth.GiteaOAuth2Handler
+	jwt         *auth.JwtTokenGenerator
+	oauthHandler *auth.GiteaOAuth2Handler
+	cfg         *config.Config
 }
 
-var OauthLoginHandlerInstance *OauthLoginHandler
-
-func InitOauthLoginHandler() {
-	OauthLoginHandlerInstance = &OauthLoginHandler{
-		Jwt:               *auth.JwtTokenGeneratorInstance,
-		OauthLoginHandler: auth.GiteaOauth2HandlerInstance,
+func NewOauthLoginHandler(
+	jwt *auth.JwtTokenGenerator,
+	oauthHandler *auth.GiteaOAuth2Handler,
+	cfg *config.Config,
+) *OauthLoginHandler {
+	return &OauthLoginHandler{
+		jwt:          jwt,
+		oauthHandler: oauthHandler,
+		cfg:          cfg,
 	}
 }
 
 func (olh *OauthLoginHandler) GoToGiteaLogin(c *gin.Context) {
-	redirectURL, _ := olh.OauthLoginHandler.GetGiteaLoginURL(c.Request.URL.Scheme + c.Request.Host)
+	redirectURL, _ := olh.oauthHandler.GetGiteaLoginURL(c.Request.URL.Scheme + c.Request.Host)
 	if redirectURL != "" {
 		c.Redirect(http.StatusFound, redirectURL)
 		return
@@ -42,27 +46,28 @@ func (olh *OauthLoginHandler) LoginWithGitea(c *gin.Context) {
 		return
 	}
 
-	userEmail, err := olh.OauthLoginHandler.GetGiteaUserEmailByCode(input.Code)
+	userEmail, err := olh.oauthHandler.GetGiteaUserEmailByCode(input.Code)
 	if err != nil {
 		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
 		return
 	}
 
-	for _, email := range config.Config.GiteaOauthAllowedEmails {
+	// Check if the user's email is in the allowed list
+	for _, email := range olh.cfg.GiteaOauthAllowedEmails {
 		if email == userEmail {
-			token, err := olh.Jwt.GenerateToken(map[string]interface{}{"role": "admin"})
+			token, err := olh.jwt.GenerateToken(map[string]interface{}{"role": "admin"})
 			if err != nil {
 				c.JSON(http.StatusInternalServerError, gin.H{"error": "Token generation failed"})
 				return
 			}
 
 			c.JSON(http.StatusOK, gin.H{"message": "Login successful", "token": token})
-		} else {
-			c.JSON(401, gin.H{
-				"error": "oath login faied or yyour email does not have access",
-			})
 			return
 		}
 	}
 
-}
+	// If we get here, the email is not in the allowed list
+	c.JSON(401, gin.H{
+		"error": "oauth login failed or your email does not have access",
+	})
+}