feat(server): customizable authz endpoints (#4296)

This allows users to customize the authz endpoints.

Closes #2753, Fixes #3716

Co-authored-by: Amir Zarrinkafsh <nightah@me.com>

1 files changed, 42 insertions, 0 deletions

diff --git a/internal/handlers/handler_authz_impl_authrequest.go b/internal/handlers/handler_authz_impl_authrequest.go
new file mode 100644
index 000000000..19292201f
--- /dev/null
+++ b/internal/handlers/handler_authz_impl_authrequest.go
@@ -0,0 +1,42 @@
+package handlers
+
+import (
+	"fmt"
+	"net/url"
+
+	"github.com/valyala/fasthttp"
+
+	"github.com/authelia/authelia/v4/internal/authorization"
+	"github.com/authelia/authelia/v4/internal/middlewares"
+)
+
+func handleAuthzGetObjectAuthRequest(ctx *middlewares.AutheliaCtx) (object authorization.Object, err error) {
+	var (
+		targetURL *url.URL
+
+		rawURL, method []byte
+	)
+
+	if rawURL = ctx.XOriginalURL(); len(rawURL) == 0 {
+		return object, middlewares.ErrMissingXOriginalURL
+	}
+
+	if targetURL, err = url.ParseRequestURI(string(rawURL)); err != nil {
+		return object, fmt.Errorf("failed to parse X-Original-URL header: %w", err)
+	}
+
+	if method = ctx.XOriginalMethod(); len(method) == 0 {
+		return object, fmt.Errorf("header 'X-Original-Method' is empty")
+	}
+
+	if hasInvalidMethodCharacters(method) {
+		return object, fmt.Errorf("header 'X-Original-Method' with value '%s' has invalid characters", method)
+	}
+
+	return authorization.NewObjectRaw(targetURL, method), nil
+}
+
+func handleAuthzUnauthorizedAuthRequest(ctx *middlewares.AutheliaCtx, authn *Authn, _ *url.URL) {
+	ctx.Logger.Infof("Access to %s (method %s) is not authorized to user %s, responding with status code %d", authn.Object.URL.String(), authn.Method, authn.Username, fasthttp.StatusUnauthorized)
+	ctx.ReplyUnauthorized()
+}