fix: use ginSwagger.WrapHandler for correct path routing

internal/app/middleware/swagger.go

@@ -10,22 +10,23 @@ import (
 	"strconv"
 	"strings"
 
-	swaggerFiles "github.com/swaggo/files"
 	"github.com/gin-gonic/gin"
+	ginSwagger "github.com/swaggo/gin-swagger"
+	swaggerFiles "github.com/swaggo/files"
 )
 
 func SwaggerHandler() gin.HandlerFunc {
-	return func(c *gin.Context) {
+	wrapHandler := ginSwagger.WrapHandler(swaggerFiles.Handler)
-		rawPath := c.Request.URL.Path
-		relPath := strings.TrimPrefix(rawPath, "/swagger")
-		if relPath == "" || relPath == "/" {
-			relPath = "/index.html"
-		}
-		c.Request.URL.Path = relPath
-		defer func() { c.Request.URL.Path = rawPath }()
 
+	return func(c *gin.Context) {
+		relPath := strings.TrimPrefix(c.Request.URL.Path, "/swagger")
 		isCSS := strings.HasSuffix(relPath, "swagger-ui.css")
 
+		if !isCSS {
+			wrapHandler(c)
+			return
+		}
+
 		underlying := c.Writer
 		crw := &captureResponseWriter{
 			ginWriter: underlying,
@@ -33,7 +34,7 @@ func SwaggerHandler() gin.HandlerFunc {
 		}
 		c.Writer = crw
 
-		swaggerFiles.Handler.ServeHTTP(crw, c.Request)
+		wrapHandler(c)
 
 		c.Writer = underlying
 
@@ -44,7 +45,7 @@ func SwaggerHandler() gin.HandlerFunc {
 		h.Set("Referrer-Policy", "strict-origin-when-cross-origin")
 		h.Set("Content-Security-Policy", "default-src 'self'; style-src 'self' 'unsafe-inline'; img-src 'self' data:; font-src 'self' data:")
 
-		if isCSS && crw.code == 200 && crw.buf.Len() > 0 {
+		if crw.code == 200 && crw.buf.Len() > 0 {
 			body := append(crw.buf.Bytes(), []byte(brandingCSS)...)
 			h.Set("Content-Length", strconv.Itoa(len(body)))
 			h.Set("Content-Type", "text/css; charset=utf-8")
@@ -58,7 +59,6 @@ func SwaggerHandler() gin.HandlerFunc {
 			if ct := mime.TypeByExtension(ext); ct != "" {
 				h.Set("Content-Type", ct)
 			}
-			h.Del("Content-Length")
 			underlying.WriteHeader(crw.code)
 			underlying.Write(crw.buf.Bytes())
 			return