From afc244aa302c3c105be6097a58e26b6c69e1a79c Mon Sep 17 00:00:00 2001
From: Eunbin Son <thswlsqls@naver.com>
Date: Wed, 23 Sep 2026 09:00:45 +0900
Subject: [PATCH] [cosn] Support alternative COSN authentication options

Allow the loader to accept the endpoint suffix alternative and defer credential selection to hadoop-cos.

Generated-by: Codex
---
 .../org/apache/paimon/cosn/COSNLoader.java    |  4 +-
 .../apache/paimon/cosn/COSNLoaderTest.java    | 69 +++++++++++++++++++
 2 files changed, 70 insertions(+), 3 deletions(-)
 create mode 100644 paimon-filesystems/paimon-cosn/src/test/java/org/apache/paimon/cosn/COSNLoaderTest.java

diff --git a/paimon-filesystems/paimon-cosn/src/main/java/org/apache/paimon/cosn/COSNLoader.java b/paimon-filesystems/paimon-cosn/src/main/java/org/apache/paimon/cosn/COSNLoader.java
index 887ea479be4e..96235989fd2e 100644
--- a/paimon-filesystems/paimon-cosn/src/main/java/org/apache/paimon/cosn/COSNLoader.java
+++ b/paimon-filesystems/paimon-cosn/src/main/java/org/apache/paimon/cosn/COSNLoader.java
@@ -54,9 +54,7 @@ public String getScheme() {
     @Override
     public List<String[]> requiredOptions() {
         List<String[]> options = new ArrayList<>();
-        options.add(new String[] {"fs.cosn.bucket.region"});
-        options.add(new String[] {"fs.cosn.userinfo.secretId"});
-        options.add(new String[] {"fs.cosn.userinfo.secretKey"});
+        options.add(new String[] {"fs.cosn.bucket.region", "fs.cosn.bucket.endpoint_suffix"});
         return options;
     }
 
diff --git a/paimon-filesystems/paimon-cosn/src/test/java/org/apache/paimon/cosn/COSNLoaderTest.java b/paimon-filesystems/paimon-cosn/src/test/java/org/apache/paimon/cosn/COSNLoaderTest.java
new file mode 100644
index 000000000000..3d816d390305
--- /dev/null
+++ b/paimon-filesystems/paimon-cosn/src/test/java/org/apache/paimon/cosn/COSNLoaderTest.java
@@ -0,0 +1,69 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.paimon.cosn;
+
+import org.apache.paimon.catalog.CatalogContext;
+import org.apache.paimon.fs.FileIO;
+import org.apache.paimon.fs.Path;
+import org.apache.paimon.fs.PluginFileIO;
+import org.apache.paimon.options.Options;
+
+import org.junit.jupiter.api.Test;
+
+import java.io.IOException;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/** Tests for {@link COSNLoader}. */
+public class COSNLoaderTest {
+
+    private static final Path COSN_PATH = new Path("cosn://bucket/path");
+
+    @Test
+    public void testEndpointSuffixSelectsPluginWithDefaultCredentialChain() throws IOException {
+        Options options = new Options();
+        options.set("fs.cosn.bucket.endpoint_suffix", "cos.example.com");
+
+        assertCosnPluginSelected(options);
+    }
+
+    @Test
+    public void testEndpointSuffixSelectsPluginWithCustomCredentialProvider() throws IOException {
+        Options options = new Options();
+        options.set("fs.cosn.bucket.endpoint_suffix", "cos.example.com");
+        options.set("fs.cosn.credentials.provider", "example.CustomCredentialsProvider");
+
+        assertCosnPluginSelected(options);
+    }
+
+    @Test
+    public void testRegionSelectsPluginWithoutStaticCredentials() throws IOException {
+        Options options = new Options();
+        options.set("fs.cosn.bucket.region", "ap-test");
+
+        assertCosnPluginSelected(options);
+    }
+
+    private static void assertCosnPluginSelected(Options options) throws IOException {
+        FileIO fileIO = FileIO.get(COSN_PATH, CatalogContext.create(options));
+
+        assertThat(fileIO).isInstanceOf(PluginFileIO.class);
+        assertThat(fileIO.getClass().getEnclosingClass()).isEqualTo(COSNLoader.class);
+    }
+}