refactor: rework file structure (#325)

* wip: add middlewares

* refactor: use context fom middleware in handlers

* refactor: use controller approach in handlers

* refactor: move oauth providers into services (non-working)

* feat: create oauth broker service

* refactor: use a boostrap service to bootstrap the app

* refactor: split utils into smaller files

* refactor: use more clear name for frontend assets

* feat: allow customizability of resources dir

* fix: fix typo in ui middleware

* fix: validate resource file paths in ui middleware

* refactor: move resource handling to a controller

* feat: add some logging

* fix: configure middlewares before groups

* fix: use correct api path in login mutation

* fix: coderabbit suggestions

* fix: further coderabbit suggestions

internal/middleware/ui_middleware.go

@@ -0,0 +1,56 @@
+package middleware
+
+import (
+	"io/fs"
+	"net/http"
+	"os"
+	"strings"
+	"tinyauth/internal/assets"
+
+	"github.com/gin-gonic/gin"
+)
+
+type UIMiddleware struct {
+	UIFS         fs.FS
+	UIFileServer http.Handler
+}
+
+func NewUIMiddleware() *UIMiddleware {
+	return &UIMiddleware{}
+}
+
+func (m *UIMiddleware) Init() error {
+	ui, err := fs.Sub(assets.FrontendAssets, "dist")
+
+	if err != nil {
+		return err
+	}
+
+	m.UIFS = ui
+	m.UIFileServer = http.FileServer(http.FS(ui))
+
+	return nil
+}
+
+func (m *UIMiddleware) Middleware() gin.HandlerFunc {
+	return func(c *gin.Context) {
+		switch strings.Split(c.Request.URL.Path, "/")[1] {
+		case "api":
+			c.Next()
+			return
+		case "resources":
+			c.Next()
+			return
+		default:
+			_, err := fs.Stat(m.UIFS, strings.TrimPrefix(c.Request.URL.Path, "/"))
+
+			if os.IsNotExist(err) {
+				c.Request.URL.Path = "/"
+			}
+
+			m.UIFileServer.ServeHTTP(c.Writer, c.Request)
+			c.Abort()
+			return
+		}
+	}
+}