feat: update callback handler and repository for user

backend/internal/handlers/auth_handlers.go

@@ -1,6 +1,7 @@
 package handlers
 
 import (
+	"encoding/json"
 	"os"
 
 	"gitea.d3m0k1d.ru/d3m0k1d/d3m0k1d.ru/backend/internal/logger"
@@ -81,7 +82,35 @@ func (h *AuthHandlers) CallbackGithub(c *gin.Context) {
 		c.JSON(500, gin.H{"error": "exchange failed", "details": err.Error()})
 		return
 	}
+	client := h.config.Client(c.Request.Context(), token)
+	resp, err := client.Get("https://api.github.com/user")
+	if err != nil {
+		h.logger.Error("Get failed: " + err.Error())
+		c.JSON(500, gin.H{"error": "get request failed to github", "details": err.Error()})
+		return
+	}
+	var ghUser struct {
+		ID        int    `json:"id"`
+		Login     string `json:"login"`
+		Email     string `json:"email"`
+		AvatarURL string `json:"avatar_url"`
+	}
+	err = json.NewDecoder(resp.Body).Decode(&ghUser)
+	if err != nil {
+		h.logger.Error("Decode failed: " + err.Error())
+		c.JSON(500, gin.H{"error": "decode failed", "details": err.Error()})
+		return
+	}
+	isreg, err := h.repo.IsRegistered(c.Request.Context(), ghUser.ID)
+	if err != nil {
+		c.JSON(500, gin.H{"error": "database error", "details": err.Error()})
+		return
+	}
+	if isreg {
+		c.JSON(200, gin.H{"user": ghUser})
+		return
+	}
 
 	h.logger.Info("200 OK - token received")
-	c.JSON(200, gin.H{"token": token})
+	c.JSON(200, gin.H{"user": ghUser})
 }