From fb8396b58810e56a69e968bd41a98d5ffdaa5b42 Mon Sep 17 00:00:00 2001
From: Thibaut Valentin <thibaut.valentin@epita.fr>
Date: Wed, 22 Jan 2025 11:19:56 +0100
Subject: [PATCH] feat: add next redirection system

---
 .../ffsaf/FrontendForwardingFilterREST.java   | 68 +++++++++++++++++++
 1 file changed, 68 insertions(+)
 create mode 100644 src/main/java/fr/titionfire/ffsaf/FrontendForwardingFilterREST.java

diff --git a/src/main/java/fr/titionfire/ffsaf/FrontendForwardingFilterREST.java b/src/main/java/fr/titionfire/ffsaf/FrontendForwardingFilterREST.java
new file mode 100644
index 0000000..a62635c
--- /dev/null
+++ b/src/main/java/fr/titionfire/ffsaf/FrontendForwardingFilterREST.java
@@ -0,0 +1,68 @@
+package fr.titionfire.ffsaf;
+
+import io.vertx.core.http.HttpServerRequest;
+import jakarta.annotation.Priority;
+import jakarta.ws.rs.NotFoundException;
+import jakarta.ws.rs.Priorities;
+import jakarta.ws.rs.container.ResourceInfo;
+import jakarta.ws.rs.core.Context;
+import jakarta.ws.rs.core.MediaType;
+import jakarta.ws.rs.core.Response;
+import jakarta.ws.rs.core.UriInfo;
+import jakarta.ws.rs.ext.ExceptionMapper;
+import jakarta.ws.rs.ext.Provider;
+import org.jboss.logging.Logger;
+
+import java.nio.charset.StandardCharsets;
+import java.util.Objects;
+import java.util.Scanner;
+
+@Provider
+@Priority(Priorities.USER)
+public class FrontendForwardingFilterREST implements ExceptionMapper<NotFoundException> {
+
+    private static final Logger LOG = Logger.getLogger(FrontendForwardingFilterREST.class);
+
+    @Context
+    UriInfo info;
+
+    @Context
+    HttpServerRequest request;
+
+    @Context
+    ResourceInfo resourceInfo;
+
+    private static String text = null;
+
+    private static final String API_NAMESPACE_REGEX = "^/(api/.*|api)";
+    private static final String FILENAME_REGEX = "^/.*\\.[^.]+$";
+
+    @Override
+    public Response toResponse(NotFoundException exception) {
+        final String path = info.getPath();
+        final String address = request.remoteAddress().toString();
+
+        boolean isApiNamespace = path.matches(API_NAMESPACE_REGEX);
+        if (isApiNamespace) {
+            LOG.infof("Request %s from IP %s => %d", "method", path, address, exception.getResponse().getStatus());
+            return exception.getResponse();
+        }
+        boolean isFilename = path.matches(FILENAME_REGEX);
+        if (isFilename) {
+            LOG.infof("Request %s from IP %s => %d", "method", path, address, exception.getResponse().getStatus());
+            return exception.getResponse();
+        }
+        boolean actualErrorResponse = resourceInfo != null && resourceInfo.getResourceMethod() != null;
+        if (actualErrorResponse) {
+            LOG.infof("Request %s from IP %s => %d", "method", path, address, exception.getResponse().getStatus());
+            return exception.getResponse();
+        }
+
+        if (text == null)
+            text = new Scanner(
+                    Objects.requireNonNull(this.getClass().getResourceAsStream("/META-INF/resources/index.html")),
+                    StandardCharsets.UTF_8).useDelimiter("\\A").next();
+        LOG.infof("Request %s from IP %s => redirect", "method", path, address);
+        return Response.status(200).entity(text).type(MediaType.TEXT_HTML_TYPE).build();
+    }
+}