From f3d2808f7d1badb23d604ff67a71674c849c6e54 Mon Sep 17 00:00:00 2001
From: Athou <jeremiepanzer@gmail.com>
Date: Wed, 23 Oct 2024 19:58:47 +0200
Subject: [PATCH] add support for Internationalized Domain Names (#1588)

---
 .../java/com/commafeed/backend/HttpGetter.java | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/commafeed-server/src/main/java/com/commafeed/backend/HttpGetter.java b/commafeed-server/src/main/java/com/commafeed/backend/HttpGetter.java
index 2132e929..72bede7a 100644
--- a/commafeed-server/src/main/java/com/commafeed/backend/HttpGetter.java
+++ b/commafeed-server/src/main/java/com/commafeed/backend/HttpGetter.java
@@ -2,7 +2,10 @@ package com.commafeed.backend;
 
 import java.io.IOException;
 import java.io.InputStream;
+import java.net.IDN;
+import java.net.InetAddress;
 import java.net.URI;
+import java.net.UnknownHostException;
 import java.time.Duration;
 import java.util.ArrayList;
 import java.util.List;
@@ -10,6 +13,8 @@ import java.util.Optional;
 import java.util.concurrent.ExecutionException;
 
 import org.apache.commons.lang3.StringUtils;
+import org.apache.hc.client5.http.DnsResolver;
+import org.apache.hc.client5.http.SystemDefaultDnsResolver;
 import org.apache.hc.client5.http.config.ConnectionConfig;
 import org.apache.hc.client5.http.config.RequestConfig;
 import org.apache.hc.client5.http.config.TlsConfig;
@@ -191,6 +196,7 @@ public class HttpGetter {
 				.setDefaultTlsConfig(TlsConfig.custom().setHandshakeTimeout(Timeout.of(config.httpClient().sslHandshakeTimeout())).build())
 				.setMaxConnPerRoute(poolSize)
 				.setMaxConnTotal(poolSize)
+				.setDnsResolver(new InternationalizedDomainNameToAsciiDnsResolver(SystemDefaultDnsResolver.INSTANCE))
 				.build();
 
 	}
@@ -227,6 +233,18 @@ public class HttpGetter {
 				.build();
 	}
 
+	private record InternationalizedDomainNameToAsciiDnsResolver(DnsResolver delegate) implements DnsResolver {
+		@Override
+		public InetAddress[] resolve(String host) throws UnknownHostException {
+			return delegate.resolve(IDN.toASCII(host));
+		}
+
+		@Override
+		public String resolveCanonicalHostname(String host) throws UnknownHostException {
+			return delegate.resolveCanonicalHostname(IDN.toASCII(host));
+		}
+	}
+
 	@Getter
 	public static class NotModifiedException extends Exception {
 		private static final long serialVersionUID = 1L;