chore: Update CORS middleware to allow requests from specific origin

backend/cors.go

@@ -1,16 +1,29 @@
 package main
 
-import "github.com/gin-gonic/gin"
+import (
+	"strings"
+
+	"github.com/gin-gonic/gin"
+)
 
 func CORSMiddleware() gin.HandlerFunc {
 	return func(c *gin.Context) {
-		c.Writer.Header().Set("Access-Control-Allow-Origin", "*")
-		c.Writer.Header().Set("Access-Control-Allow-Credentials", "true")
-		c.Writer.Header().Set("Access-Control-Allow-Headers", "Content-Type, Content-Length, Accept-Encoding, X-CSRF-Token, Authorization, accept, origin, Cache-Control, X-Requested-With")
-		c.Writer.Header().Set("Access-Control-Allow-Methods", "POST, OPTIONS, GET, PUT")
+		origin := c.GetHeader("Origin")
+
+		if strings.HasSuffix(origin, ".pops.cafe") {
+			c.Writer.Header().Set("Access-Control-Allow-Origin", origin)
+			c.Writer.Header().Set("Access-Control-Allow-Credentials", "true")
+			c.Writer.Header().Set("Access-Control-Allow-Headers", "Content-Type, Content-Length, Accept-Encoding, X-CSRF-Token, Authorization, accept, origin, Cache-Control, X-Requested-With")
+			c.Writer.Header().Set("Access-Control-Allow-Methods", "POST, OPTIONS, GET, PUT")
 
-		if c.Request.Method == "OPTIONS" {
-			c.AbortWithStatus(204)
+			if c.Request.Method == "OPTIONS" {
+				c.AbortWithStatus(204)
+				return
+			}
+		} else {
+			// Optionally handle requests from disallowed origins
+			c.JSON(403, gin.H{"error": "Access not allowed"})
+			c.Abort()
 			return
 		}