feat(api): Migrate from gorilla/mux to fiber

Fixes #468

api/config_test.go

@@ -0,0 +1,46 @@
+package api
+
+import (
+	"io"
+	"net/http"
+	"testing"
+
+	"github.com/TwiN/gatus/v5/security"
+	"github.com/gofiber/fiber/v2"
+)
+
+func TestConfigHandler_ServeHTTP(t *testing.T) {
+	securityConfig := &security.Config{
+		OIDC: &security.OIDCConfig{
+			IssuerURL:       "https://sso.gatus.io/",
+			RedirectURL:     "http://localhost:80/authorization-code/callback",
+			Scopes:          []string{"openid"},
+			AllowedSubjects: []string{"user1@example.com"},
+		},
+	}
+	handler := ConfigHandler{securityConfig: securityConfig}
+	// Create a fake router. We're doing this because I need the gate to be initialized.
+	app := fiber.New()
+	app.Get("/api/v1/config", handler.GetConfig)
+	err := securityConfig.ApplySecurityMiddleware(app)
+	if err != nil {
+		t.Error("expected err to be nil, but was", err)
+	}
+	// Test the config handler
+	request, _ := http.NewRequest("GET", "/api/v1/config", http.NoBody)
+	response, err := app.Test(request)
+	if err != nil {
+		t.Error("expected err to be nil, but was", err)
+	}
+	defer response.Body.Close()
+	if response.StatusCode != http.StatusOK {
+		t.Error("expected code to be 200, but was", response.StatusCode)
+	}
+	body, err := io.ReadAll(response.Body)
+	if err != nil {
+		t.Error("expected err to be nil, but was", err)
+	}
+	if string(body) != `{"oidc":true,"authenticated":false}` {
+		t.Error("expected body to be `{\"oidc\":true,\"authenticated\":false}`, but was", string(body))
+	}
+}