Extract common methods for auth0/okta request filters to utils class

1 files changed, 72 insertions, 0 deletions

diff --git a/container-core/src/main/java/com/yahoo/jdisc/http/filter/util/FilterUtils.java b/container-core/src/main/java/com/yahoo/jdisc/http/filter/util/FilterUtils.java
new file mode 100644
index 00000000000..285fab88dd9
--- /dev/null
+++ b/container-core/src/main/java/com/yahoo/jdisc/http/filter/util/FilterUtils.java
@@ -0,0 +1,72 @@
+// Copyright Verizon Media. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+package com.yahoo.jdisc.http.filter.util;
+
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.databind.node.ObjectNode;
+import com.fasterxml.jackson.databind.node.TextNode;
+import com.yahoo.jdisc.Response;
+import com.yahoo.jdisc.handler.ContentChannel;
+import com.yahoo.jdisc.handler.ResponseHandler;
+import com.yahoo.jdisc.http.Cookie;
+import com.yahoo.jdisc.http.filter.DiscFilterRequest;
+
+import java.io.UncheckedIOException;
+import java.net.URI;
+import java.net.URISyntaxException;
+import java.nio.ByteBuffer;
+import java.util.List;
+import java.util.Optional;
+
+/**
+ * Helper methods for auth0/okta request filters.
+ *
+ * @author valerijf
+ */
+public class FilterUtils {
+
+    private static final ObjectMapper mapper = new ObjectMapper();
+
+    public static void sendRedirectResponse(ResponseHandler handler, List<Cookie> cookies, String location) {
+        Response response = createResponse(Response.Status.FOUND, cookies);
+        response.headers().add("Location", location);
+        handler.handleResponse(response).close(null);
+    }
+
+    public static void sendMessageResponse(ResponseHandler handler, List<Cookie> cookies, int code, String message) {
+        Response response = createResponse(code, cookies);
+        ContentChannel contentChannel = handler.handleResponse(response);
+        try {
+            ObjectNode jsonNode = mapper.createObjectNode();
+            jsonNode.set("message", TextNode.valueOf(message));
+            byte[] jsonBytes = mapper.writerWithDefaultPrettyPrinter().writeValueAsBytes(jsonNode);
+            contentChannel.write(ByteBuffer.wrap(jsonBytes), null);
+        } catch (JsonProcessingException e) {
+            throw new UncheckedIOException(e);
+        }
+        contentChannel.close(null);
+    }
+
+    private static Response createResponse(int code, List<Cookie> cookies) {
+        Response response = new Response(code);
+        List<String> setCookieHeaders = Cookie.toSetCookieHeaders(cookies);
+        response.headers().add("Set-Cookie", setCookieHeaders);
+        return response;
+    }
+
+    public static URI createUriFromRequest(DiscFilterRequest request, String path) {
+        Optional<Integer> port = Optional.empty();
+        try {
+            port = Optional.ofNullable(request.getHeader("Host"))
+                    .flatMap(host -> Optional.of(host.lastIndexOf(':') + 1)
+                            .filter(i -> i > 0)
+                            .map(index -> Integer.parseInt(host.substring(index))));
+        } catch (NumberFormatException ignored) { }
+
+        try {
+            return new URI(request.getScheme(), null, request.getServerName(), port.orElse(-1), path, null, null);
+        } catch (URISyntaxException e) {
+            throw new RuntimeException(e);
+        }
+    }
+}