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The following commit(s) were added to refs/heads/master by this push:
     new 5925d3940c [rest] Add pluggable signer architecture for REST API 
authentication (#7100)
5925d3940c is described below

commit 5925d3940cfdee86694c927cc49dc29d7bb18f4b
Author: Dapeng Sun(孙大鹏) <[email protected]>
AuthorDate: Thu Jan 29 16:14:49 2026 +0800

    [rest] Add pluggable signer architecture for REST API authentication (#7100)
---
 docs/content/concepts/rest/dlf.md                  |  23 ++
 .../java/org/apache/paimon/rest/HttpClient.java    |  21 +-
 .../org/apache/paimon/rest/RESTCatalogOptions.java |   9 +
 .../apache/paimon/rest/auth/DLFAuthProvider.java   | 103 ++++++---
 .../paimon/rest/auth/DLFAuthProviderFactory.java   |  37 ++-
 ...DLFAuthSignature.java => DLFDefaultSigner.java} |  73 +++++-
 .../apache/paimon/rest/auth/DLFOpenApiSigner.java  | 248 +++++++++++++++++++++
 .../apache/paimon/rest/auth/DLFRequestSigner.java  |  66 ++++++
 .../paimon/rest/auth/DLFRequestSignerTest.java     | 220 ++++++++++++++++++
 .../apache/paimon/rest/MockRESTCatalogTest.java    |  11 +-
 .../apache/paimon/rest/auth/AuthProviderTest.java  |  15 +-
 .../paimon/rest/auth/DLFAuthSignatureTest.java     |  14 +-
 12 files changed, 778 insertions(+), 62 deletions(-)

diff --git a/docs/content/concepts/rest/dlf.md 
b/docs/content/concepts/rest/dlf.md
index d093ad07df..ce6b6fbe4d 100644
--- a/docs/content/concepts/rest/dlf.md
+++ b/docs/content/concepts/rest/dlf.md
@@ -115,3 +115,26 @@ WITH (
     -- 'dlf.token-ecs-role-name' = 'my_ecs_role_name'
 );
 ```
+
+## DLF Endpoint Configuration
+
+Paimon supports two types of DLF endpoints and automatically selects the 
appropriate signing algorithm:
+
+- **DLF VPC endpoints** (e.g., `cn-hangzhou-vpc.dlf.aliyuncs.com`): 
Recommended for VPC environments with better performance and lower latency.
+- **DLF OpenAPI endpoints** (e.g., `dlfnext.cn-hangzhou.aliyuncs.com`): 
Supports public network access through Alibaba Cloud API infrastructure. 
+  **Note:** Currently OpenAPI Endpoints only supports database and table names 
with alphanumeric characters (A-Z, a-z, 0-9) and specific symbols.
+
+Simply configure the endpoint URI, and Paimon will automatically handle the 
authentication:
+
+```sql
+CREATE CATALOG `paimon-rest-catalog`
+WITH (
+    'type' = 'paimon',
+    'uri' = 'https://${region}-vpc.dlf.aliyuncs.com',  -- or OpenAPI endpoint: 
https://dlfnext.cn-hangzhou.aliyuncs.com
+    'metastore' = 'rest',
+    'warehouse' = 'my_instance_name',
+    'token.provider' = 'dlf',
+    'dlf.access-key-id'='<access-key-id>',
+    'dlf.access-key-secret'='<access-key-secret>'
+);
+```
diff --git a/paimon-api/src/main/java/org/apache/paimon/rest/HttpClient.java 
b/paimon-api/src/main/java/org/apache/paimon/rest/HttpClient.java
index c59d642e79..84ddb6c75e 100644
--- a/paimon-api/src/main/java/org/apache/paimon/rest/HttpClient.java
+++ b/paimon-api/src/main/java/org/apache/paimon/rest/HttpClient.java
@@ -38,8 +38,10 @@ import org.apache.hc.core5.http.io.entity.StringEntity;
 import org.apache.hc.core5.http.message.BasicHeader;
 
 import java.io.IOException;
+import java.util.Arrays;
 import java.util.Collections;
 import java.util.Map;
+import java.util.Objects;
 import java.util.function.Function;
 
 import static org.apache.paimon.rest.HttpClientUtils.DEFAULT_HTTP_CLIENT;
@@ -142,7 +144,7 @@ public class HttpClient implements RESTClient {
                                                         : "response body is 
null",
                                                 response.getCode());
                             }
-                            errorHandler.accept(error, getRequestId(response));
+                            errorHandler.accept(error, 
extractRequestId(response));
                         }
                         if (responseType != null && responseBodyStr != null) {
                             return RESTApi.fromJson(responseBodyStr, 
responseType);
@@ -184,9 +186,22 @@ public class HttpClient implements RESTClient {
         return uri;
     }
 
-    private static String getRequestId(ClassicHttpResponse response) {
+    private static String extractRequestId(ClassicHttpResponse response) {
         Header header = 
response.getFirstHeader(LoggingInterceptor.REQUEST_ID_KEY);
-        return header != null ? header.getValue() : 
LoggingInterceptor.DEFAULT_REQUEST_ID;
+        if (header != null && header.getValue() != null) {
+            return header.getValue();
+        }
+
+        // look for any header containing "request-id"
+        return Arrays.stream(response.getHeaders())
+                .filter(
+                        h ->
+                                h.getName() != null
+                                        && 
h.getName().toLowerCase().contains("request-id"))
+                .map(Header::getValue)
+                .filter(Objects::nonNull)
+                .findFirst()
+                .orElse(LoggingInterceptor.DEFAULT_REQUEST_ID);
     }
 
     private static Header[] getHeaders(
diff --git 
a/paimon-api/src/main/java/org/apache/paimon/rest/RESTCatalogOptions.java 
b/paimon-api/src/main/java/org/apache/paimon/rest/RESTCatalogOptions.java
index bc906fb2d2..e7da1f6827 100644
--- a/paimon-api/src/main/java/org/apache/paimon/rest/RESTCatalogOptions.java
+++ b/paimon-api/src/main/java/org/apache/paimon/rest/RESTCatalogOptions.java
@@ -104,6 +104,15 @@ public class RESTCatalogOptions {
                     .noDefaultValue()
                     .withDescription("REST Catalog DLF OSS endpoint.");
 
+    public static final ConfigOption<String> DLF_SIGNING_ALGORITHM =
+            ConfigOptions.key("dlf.signing-algorithm")
+                    .stringType()
+                    .defaultValue("default")
+                    .withDescription(
+                            "DLF signing algorithm. Options: 'default' (for 
default VPC endpoint), "
+                                    + "'openapi' (for DlfNext/2026-01-18). "
+                                    + "If not set, will be automatically 
selected based on endpoint host.");
+
     public static final ConfigOption<Boolean> IO_CACHE_ENABLED =
             ConfigOptions.key("io-cache.enabled")
                     .booleanType()
diff --git 
a/paimon-api/src/main/java/org/apache/paimon/rest/auth/DLFAuthProvider.java 
b/paimon-api/src/main/java/org/apache/paimon/rest/auth/DLFAuthProvider.java
index 04084f3299..ee6b56472c 100644
--- a/paimon-api/src/main/java/org/apache/paimon/rest/auth/DLFAuthProvider.java
+++ b/paimon-api/src/main/java/org/apache/paimon/rest/auth/DLFAuthProvider.java
@@ -25,8 +25,7 @@ import org.slf4j.LoggerFactory;
 
 import javax.annotation.Nullable;
 
-import java.time.ZoneOffset;
-import java.time.ZonedDateTime;
+import java.time.Instant;
 import java.time.format.DateTimeFormatter;
 import java.util.HashMap;
 import java.util.Map;
@@ -53,25 +52,41 @@ public class DLFAuthProvider implements AuthProvider {
     protected static final String MEDIA_TYPE = "application/json";
 
     @Nullable private final DLFTokenLoader tokenLoader;
+    private final String uri;
     private final String region;
+    private final String signingAlgorithm;
 
     @Nullable protected volatile DLFToken token;
+    private final DLFRequestSigner signer;
 
-    public static DLFAuthProvider fromTokenLoader(DLFTokenLoader tokenLoader, 
String region) {
-        return new DLFAuthProvider(tokenLoader, null, region);
+    public static DLFAuthProvider fromTokenLoader(
+            DLFTokenLoader tokenLoader, String uri, String region, String 
signingAlgorithm) {
+        return new DLFAuthProvider(tokenLoader, null, uri, region, 
signingAlgorithm);
     }
 
     public static DLFAuthProvider fromAccessKey(
-            String accessKeyId, String accessKeySecret, String securityToken, 
String region) {
+            String accessKeyId,
+            String accessKeySecret,
+            @Nullable String securityToken,
+            String uri,
+            String region,
+            String signingAlgorithm) {
         DLFToken token = new DLFToken(accessKeyId, accessKeySecret, 
securityToken, null);
-        return new DLFAuthProvider(null, token, region);
+        return new DLFAuthProvider(null, token, uri, region, signingAlgorithm);
     }
 
     public DLFAuthProvider(
-            @Nullable DLFTokenLoader tokenLoader, @Nullable DLFToken token, 
String region) {
+            @Nullable DLFTokenLoader tokenLoader,
+            @Nullable DLFToken token,
+            String uri,
+            String region,
+            String signingAlgorithm) {
         this.tokenLoader = tokenLoader;
         this.token = token;
+        this.uri = uri;
         this.region = region;
+        this.signingAlgorithm = signingAlgorithm;
+        this.signer = createSigner(signingAlgorithm);
     }
 
     @Override
@@ -79,23 +94,61 @@ public class DLFAuthProvider implements AuthProvider {
             Map<String, String> baseHeader, RESTAuthParameter 
restAuthParameter) {
         DLFToken token = getFreshToken();
         try {
-            String dateTime =
-                    baseHeader.getOrDefault(
-                            DLF_DATE_HEADER_KEY.toLowerCase(),
-                            
ZonedDateTime.now(ZoneOffset.UTC).format(AUTH_DATE_TIME_FORMATTER));
-            String date = dateTime.substring(0, 8);
+            Instant now = Instant.now();
+            String host = extractHost(uri);
             Map<String, String> signHeaders =
-                    generateSignHeaders(
-                            restAuthParameter.data(), dateTime, 
token.getSecurityToken());
+                    signer.signHeaders(
+                            restAuthParameter.data(), now, 
token.getSecurityToken(), host);
             String authorization =
-                    DLFAuthSignature.getAuthorization(
-                            restAuthParameter, token, region, signHeaders, 
dateTime, date);
+                    signer.authorization(restAuthParameter, token, host, 
signHeaders);
             Map<String, String> headersWithAuth = new HashMap<>(baseHeader);
             headersWithAuth.putAll(signHeaders);
             headersWithAuth.put(DLF_AUTHORIZATION_HEADER_KEY, authorization);
             return headersWithAuth;
         } catch (Exception e) {
-            throw new RuntimeException(e);
+            throw new RuntimeException("Failed to generate authorization 
header", e);
+        }
+    }
+
+    /**
+     * Extracts the host (with port if present) from a URI string.
+     *
+     * <p>Handles URIs in the following formats:
+     *
+     * <ul>
+     *   <li>http://hostname/prefix -> hostname
+     *   <li>https://hostname:8080/prefix -> hostname:8080
+     *   <li>http://hostname -> hostname
+     *   <li>https://hostname:8080 -> hostname:8080
+     * </ul>
+     *
+     * @param uri the URI string
+     * @return the host part (with port if present) of the URI
+     */
+    @VisibleForTesting
+    static String extractHost(String uri) {
+        // Remove protocol (http:// or https://)
+        String withoutProtocol = uri.replaceFirst("^https?://", "");
+
+        // Remove path (everything after '/')
+        int pathIndex = withoutProtocol.indexOf('/');
+        return pathIndex >= 0 ? withoutProtocol.substring(0, pathIndex) : 
withoutProtocol;
+    }
+
+    private DLFRequestSigner createSigner(String signingAlgorithm) {
+        switch (signingAlgorithm) {
+            case DLFDefaultSigner.IDENTIFIER:
+                return new DLFDefaultSigner(region);
+            case DLFOpenApiSigner.IDENTIFIER:
+                return new DLFOpenApiSigner();
+            default:
+                throw new IllegalArgumentException(
+                        "Unknown DLF signing algorithm: "
+                                + signingAlgorithm
+                                + ". Supported: "
+                                + DLFDefaultSigner.IDENTIFIER
+                                + ", "
+                                + DLFOpenApiSigner.IDENTIFIER);
         }
     }
 
@@ -135,20 +188,4 @@ public class DLFAuthProvider implements AuthProvider {
         long now = System.currentTimeMillis();
         return expireTime - now < TOKEN_EXPIRATION_SAFE_TIME_MILLIS;
     }
-
-    public static Map<String, String> generateSignHeaders(
-            String data, String dateTime, String securityToken) throws 
Exception {
-        Map<String, String> signHeaders = new HashMap<>();
-        signHeaders.put(DLF_DATE_HEADER_KEY, dateTime);
-        signHeaders.put(DLF_CONTENT_SHA56_HEADER_KEY, DLF_CONTENT_SHA56_VALUE);
-        signHeaders.put(DLF_AUTH_VERSION_HEADER_KEY, DLFAuthSignature.VERSION);
-        if (data != null && !data.isEmpty()) {
-            signHeaders.put(DLF_CONTENT_TYPE_KEY, MEDIA_TYPE);
-            signHeaders.put(DLF_CONTENT_MD5_HEADER_KEY, 
DLFAuthSignature.md5(data));
-        }
-        if (securityToken != null) {
-            signHeaders.put(DLF_SECURITY_TOKEN_HEADER_KEY, securityToken);
-        }
-        return signHeaders;
-    }
 }
diff --git 
a/paimon-api/src/main/java/org/apache/paimon/rest/auth/DLFAuthProviderFactory.java
 
b/paimon-api/src/main/java/org/apache/paimon/rest/auth/DLFAuthProviderFactory.java
index 030dc396e1..1ce7d0a79a 100644
--- 
a/paimon-api/src/main/java/org/apache/paimon/rest/auth/DLFAuthProviderFactory.java
+++ 
b/paimon-api/src/main/java/org/apache/paimon/rest/auth/DLFAuthProviderFactory.java
@@ -20,6 +20,7 @@ package org.apache.paimon.rest.auth;
 
 import org.apache.paimon.options.Options;
 import org.apache.paimon.rest.RESTCatalogOptions;
+import org.apache.paimon.utils.StringUtils;
 
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
@@ -36,25 +37,32 @@ public class DLFAuthProviderFactory implements 
AuthProviderFactory {
 
     @Override
     public AuthProvider create(Options options) {
+        String uri = options.get(URI);
         String region =
                 options.getOptional(RESTCatalogOptions.DLF_REGION)
-                        .orElseGet(() -> parseRegionFromUri(options.get(URI)));
+                        .orElseGet(() -> parseRegionFromUri(uri));
+        String signingAlgorithm =
+                options.getOptional(RESTCatalogOptions.DLF_SIGNING_ALGORITHM)
+                        .orElseGet(() -> parseSigningAlgoFromUri(uri));
+
         if 
(options.getOptional(RESTCatalogOptions.DLF_TOKEN_LOADER).isPresent()) {
             DLFTokenLoader dlfTokenLoader =
                     DLFTokenLoaderFactory.createDLFTokenLoader(
                             options.get(RESTCatalogOptions.DLF_TOKEN_LOADER), 
options);
-            return DLFAuthProvider.fromTokenLoader(dlfTokenLoader, region);
+            return DLFAuthProvider.fromTokenLoader(dlfTokenLoader, uri, 
region, signingAlgorithm);
         } else if 
(options.getOptional(RESTCatalogOptions.DLF_TOKEN_PATH).isPresent()) {
             DLFTokenLoader dlfTokenLoader =
                     DLFTokenLoaderFactory.createDLFTokenLoader("local_file", 
options);
-            return DLFAuthProvider.fromTokenLoader(dlfTokenLoader, region);
+            return DLFAuthProvider.fromTokenLoader(dlfTokenLoader, uri, 
region, signingAlgorithm);
         } else if 
(options.getOptional(RESTCatalogOptions.DLF_ACCESS_KEY_ID).isPresent()
                 && 
options.getOptional(RESTCatalogOptions.DLF_ACCESS_KEY_SECRET).isPresent()) {
             return DLFAuthProvider.fromAccessKey(
                     options.get(RESTCatalogOptions.DLF_ACCESS_KEY_ID),
                     options.get(RESTCatalogOptions.DLF_ACCESS_KEY_SECRET),
                     options.get(RESTCatalogOptions.DLF_SECURITY_TOKEN),
-                    region);
+                    uri,
+                    region,
+                    signingAlgorithm);
         }
         throw new IllegalArgumentException("DLF token path or AK must be set 
for DLF Auth.");
     }
@@ -74,4 +82,25 @@ public class DLFAuthProviderFactory implements 
AuthProviderFactory {
         throw new IllegalArgumentException(
                 "Could not get region from conf or uri, please check your 
config.");
     }
+
+    /**
+     * Parse signing algorithm from uri. Automatically selects the appropriate 
signer based on the
+     * endpoint uri.
+     *
+     * @param uri endpoint uri
+     * @return signing algorithm identifier
+     */
+    protected static String parseSigningAlgoFromUri(String uri) {
+        if (StringUtils.isEmpty(uri)) {
+            return DLFDefaultSigner.IDENTIFIER;
+        }
+
+        // Check for aliyun openapi endpoints
+        if (uri.toLowerCase().contains("dlfnext")) {
+            return DLFOpenApiSigner.IDENTIFIER;
+        }
+
+        // Default to dlf for unknown hosts
+        return DLFDefaultSigner.IDENTIFIER;
+    }
 }
diff --git 
a/paimon-api/src/main/java/org/apache/paimon/rest/auth/DLFAuthSignature.java 
b/paimon-api/src/main/java/org/apache/paimon/rest/auth/DLFDefaultSigner.java
similarity index 75%
rename from 
paimon-api/src/main/java/org/apache/paimon/rest/auth/DLFAuthSignature.java
rename to 
paimon-api/src/main/java/org/apache/paimon/rest/auth/DLFDefaultSigner.java
index 144384934a..76daf5c72f 100644
--- a/paimon-api/src/main/java/org/apache/paimon/rest/auth/DLFAuthSignature.java
+++ b/paimon-api/src/main/java/org/apache/paimon/rest/auth/DLFDefaultSigner.java
@@ -22,12 +22,17 @@ import org.apache.paimon.utils.StringUtils;
 
 import org.apache.paimon.shade.guava30.com.google.common.base.Joiner;
 
+import javax.annotation.Nullable;
 import javax.crypto.Mac;
 import javax.crypto.spec.SecretKeySpec;
 
 import java.security.MessageDigest;
+import java.time.Instant;
+import java.time.ZoneOffset;
+import java.time.ZonedDateTime;
 import java.util.Arrays;
 import java.util.Base64;
+import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 import java.util.TreeMap;
@@ -40,9 +45,13 @@ import static 
org.apache.paimon.rest.auth.DLFAuthProvider.DLF_CONTENT_TYPE_KEY;
 import static org.apache.paimon.rest.auth.DLFAuthProvider.DLF_DATE_HEADER_KEY;
 import static 
org.apache.paimon.rest.auth.DLFAuthProvider.DLF_SECURITY_TOKEN_HEADER_KEY;
 
-/** generate authorization for <b>Ali CLoud</b> DLF. */
-public class DLFAuthSignature {
+/**
+ * Signer for DLF default VPC endpoint authentication. This is the default 
signer for backward
+ * compatibility.
+ */
+public class DLFDefaultSigner implements DLFRequestSigner {
 
+    public static final String IDENTIFIER = "default";
     public static final String VERSION = "v1";
 
     private static final String SIGNATURE_ALGORITHM = "DLF4-HMAC-SHA256";
@@ -60,10 +69,62 @@ public class DLFAuthSignature {
                     DLF_AUTH_VERSION_HEADER_KEY.toLowerCase(),
                     DLF_SECURITY_TOKEN_HEADER_KEY.toLowerCase());
 
-    public static String getAuthorization(
+    private final String region;
+
+    public DLFDefaultSigner(String region) {
+        this.region = region;
+    }
+
+    @Override
+    public Map<String, String> signHeaders(
+            @Nullable String body, Instant now, @Nullable String 
securityToken, String host) {
+        try {
+            String dateTime =
+                    ZonedDateTime.ofInstant(now, ZoneOffset.UTC)
+                            .format(DLFAuthProvider.AUTH_DATE_TIME_FORMATTER);
+            return generateSignHeaders(body, dateTime, securityToken);
+        } catch (Exception e) {
+            throw new RuntimeException("Failed to generate sign headers", e);
+        }
+    }
+
+    @Override
+    public String authorization(
+            RESTAuthParameter restAuthParameter,
+            DLFToken token,
+            String host,
+            Map<String, String> signHeaders)
+            throws Exception {
+        String dateTime = signHeaders.get(DLFAuthProvider.DLF_DATE_HEADER_KEY);
+        String date = dateTime.substring(0, 8);
+        return getAuthorization(restAuthParameter, region, token, signHeaders, 
dateTime, date);
+    }
+
+    @Override
+    public String identifier() {
+        return IDENTIFIER;
+    }
+
+    private static Map<String, String> generateSignHeaders(
+            String data, String dateTime, String securityToken) throws 
Exception {
+        Map<String, String> signHeaders = new HashMap<>();
+        signHeaders.put(DLF_DATE_HEADER_KEY, dateTime);
+        signHeaders.put(DLF_CONTENT_SHA56_HEADER_KEY, 
DLFAuthProvider.DLF_CONTENT_SHA56_VALUE);
+        signHeaders.put(DLF_AUTH_VERSION_HEADER_KEY, VERSION);
+        if (data != null && !data.isEmpty()) {
+            signHeaders.put(DLF_CONTENT_TYPE_KEY, DLFAuthProvider.MEDIA_TYPE);
+            signHeaders.put(DLF_CONTENT_MD5_HEADER_KEY, md5(data));
+        }
+        if (securityToken != null) {
+            signHeaders.put(DLF_SECURITY_TOKEN_HEADER_KEY, securityToken);
+        }
+        return signHeaders;
+    }
+
+    private static String getAuthorization(
             RESTAuthParameter restAuthParameter,
-            DLFToken dlfToken,
             String region,
+            DLFToken dlfToken,
             Map<String, String> headers,
             String dateTime,
             String date)
@@ -95,7 +156,7 @@ public class DLFAuthSignature {
                         String.format("%s=%s", SIGNATURE_KEY, signature));
     }
 
-    public static String md5(String raw) throws Exception {
+    private static String md5(String raw) throws Exception {
         MessageDigest messageDigest = MessageDigest.getInstance("MD5");
         messageDigest.update(raw.getBytes(UTF_8));
         byte[] md5 = messageDigest.digest();
@@ -113,7 +174,7 @@ public class DLFAuthSignature {
         }
     }
 
-    public static String getCanonicalRequest(
+    private static String getCanonicalRequest(
             RESTAuthParameter restAuthParameter, Map<String, String> headers) {
         String canonicalRequest =
                 Joiner.on(NEW_LINE)
diff --git 
a/paimon-api/src/main/java/org/apache/paimon/rest/auth/DLFOpenApiSigner.java 
b/paimon-api/src/main/java/org/apache/paimon/rest/auth/DLFOpenApiSigner.java
new file mode 100644
index 0000000000..0e109dd62f
--- /dev/null
+++ b/paimon-api/src/main/java/org/apache/paimon/rest/auth/DLFOpenApiSigner.java
@@ -0,0 +1,248 @@
+/*
+ * 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.rest.auth;
+
+import org.apache.paimon.utils.StringUtils;
+
+import javax.annotation.Nullable;
+import javax.crypto.Mac;
+import javax.crypto.spec.SecretKeySpec;
+
+import java.nio.charset.StandardCharsets;
+import java.security.MessageDigest;
+import java.text.SimpleDateFormat;
+import java.time.Instant;
+import java.util.Base64;
+import java.util.HashMap;
+import java.util.Locale;
+import java.util.Map;
+import java.util.TimeZone;
+import java.util.TreeMap;
+import java.util.UUID;
+
+import static org.apache.paimon.rest.RESTUtil.decodeString;
+
+/**
+ * Signer for Aliyun OpenAPI (product code: DlfNext/2026-01-18).
+ *
+ * <p>Reference: https://help.aliyun.com/zh/sdk/product-overview/roa-mechanism
+ */
+public class DLFOpenApiSigner implements DLFRequestSigner {
+
+    public static final String IDENTIFIER = "openapi";
+
+    private static final String HMAC_SHA1 = "HmacSHA1";
+    private static final String DATE_HEADER = "Date";
+    private static final String ACCEPT_HEADER = "Accept";
+    private static final String CONTENT_MD5_HEADER = "Content-MD5";
+    private static final String CONTENT_TYPE_HEADER = "Content-Type";
+    private static final String HOST_HEADER = "Host";
+    private static final String X_ACS_SIGNATURE_METHOD = 
"x-acs-signature-method";
+    private static final String X_ACS_SIGNATURE_NONCE = 
"x-acs-signature-nonce";
+    private static final String X_ACS_SIGNATURE_VERSION = 
"x-acs-signature-version";
+    private static final String X_ACS_VERSION = "x-acs-version";
+    private static final String X_ACS_SECURITY_TOKEN = "x-acs-security-token";
+
+    private static final String ACCEPT_VALUE = "application/json";
+    private static final String CONTENT_TYPE_VALUE = "application/json";
+    private static final String SIGNATURE_METHOD_VALUE = "HMAC-SHA1";
+    private static final String SIGNATURE_VERSION_VALUE = "1.0";
+    private static final String API_VERSION = "2026-01-18";
+
+    private static final SimpleDateFormat GMT_DATE_FORMATTER =
+            new SimpleDateFormat("EEE, dd MMM yyyy HH:mm:ss 'GMT'", 
Locale.ENGLISH);
+
+    static {
+        GMT_DATE_FORMATTER.setTimeZone(TimeZone.getTimeZone("GMT"));
+    }
+
+    @Override
+    public Map<String, String> signHeaders(
+            @Nullable String body, Instant now, @Nullable String 
securityToken, String host) {
+        Map<String, String> headers = new HashMap<>();
+
+        // Date header (GMT format)
+        String dateStr = GMT_DATE_FORMATTER.format(java.util.Date.from(now));
+        headers.put(DATE_HEADER, dateStr);
+
+        // Accept header
+        headers.put(ACCEPT_HEADER, ACCEPT_VALUE);
+
+        // Content-MD5 (if body exists)
+        if (body != null && !body.isEmpty()) {
+            try {
+                headers.put(CONTENT_MD5_HEADER, md5Base64(body));
+                headers.put(CONTENT_TYPE_HEADER, CONTENT_TYPE_VALUE);
+            } catch (Exception e) {
+                throw new RuntimeException("Failed to calculate Content-MD5", 
e);
+            }
+        }
+
+        // Host header
+        headers.put(HOST_HEADER, host);
+
+        // x-acs-* headers
+        headers.put(X_ACS_SIGNATURE_METHOD, SIGNATURE_METHOD_VALUE);
+        headers.put(X_ACS_SIGNATURE_NONCE, UUID.randomUUID().toString());
+        headers.put(X_ACS_SIGNATURE_VERSION, SIGNATURE_VERSION_VALUE);
+        headers.put(X_ACS_VERSION, API_VERSION);
+
+        // Security token (if present)
+        if (securityToken != null) {
+            headers.put(X_ACS_SECURITY_TOKEN, securityToken);
+        }
+
+        return headers;
+    }
+
+    @Override
+    public String authorization(
+            RESTAuthParameter restAuthParameter,
+            DLFToken token,
+            String host,
+            Map<String, String> signHeaders)
+            throws Exception {
+        // Step 1: Build CanonicalizedHeaders (x-acs-* headers, sorted, 
lowercase)
+        String canonicalizedHeaders = buildCanonicalizedHeaders(signHeaders);
+
+        // Step 2: Build CanonicalizedResource (path + sorted query string)
+        String canonicalizedResource = 
buildCanonicalizedResource(restAuthParameter);
+
+        // Step 3: Build StringToSign
+        String stringToSign =
+                buildStringToSign(
+                        restAuthParameter,
+                        signHeaders,
+                        canonicalizedHeaders,
+                        canonicalizedResource);
+
+        // Step 4: Calculate signature
+        String signature = calculateSignature(stringToSign, 
token.getAccessKeySecret());
+
+        // Step 5: Build Authorization header
+        return "acs " + token.getAccessKeyId() + ":" + signature;
+    }
+
+    @Override
+    public String identifier() {
+        return IDENTIFIER;
+    }
+
+    private static String buildCanonicalizedHeaders(Map<String, String> 
headers) {
+        TreeMap<String, String> sortedHeaders = new TreeMap<>();
+        for (Map.Entry<String, String> entry : headers.entrySet()) {
+            String key = entry.getKey().toLowerCase();
+            if (key.startsWith("x-acs-")) {
+                sortedHeaders.put(key, StringUtils.trim(entry.getValue()));
+            }
+        }
+
+        StringBuilder sb = new StringBuilder();
+        for (Map.Entry<String, String> entry : sortedHeaders.entrySet()) {
+            
sb.append(entry.getKey()).append(":").append(entry.getValue()).append("\n");
+        }
+        return sb.toString();
+    }
+
+    private static String buildCanonicalizedResource(RESTAuthParameter 
restAuthParameter) {
+        // Decode the path and use the original unencoded path for signature 
calculation
+        // For paths containing special characters like $ (encoded as %24)
+        String path = decodeString(restAuthParameter.resourcePath());
+        Map<String, String> params = restAuthParameter.parameters();
+
+        if (params == null || params.isEmpty()) {
+            return path;
+        }
+
+        // Sort query parameters by key
+        TreeMap<String, String> sortedParams = new TreeMap<>();
+        for (Map.Entry<String, String> entry : params.entrySet()) {
+            sortedParams.put(
+                    entry.getKey(), entry.getValue() != null ? 
decodeString(entry.getValue()) : "");
+        }
+
+        // Build query string
+        StringBuilder queryString = new StringBuilder();
+        boolean first = true;
+        for (Map.Entry<String, String> entry : sortedParams.entrySet()) {
+            if (!first) {
+                queryString.append("&");
+            }
+            queryString.append(entry.getKey());
+            String value = entry.getValue();
+            if (value != null && !value.isEmpty()) {
+                queryString.append("=").append(value);
+            }
+            first = false;
+        }
+
+        return path + "?" + queryString.toString();
+    }
+
+    private static String buildStringToSign(
+            RESTAuthParameter restAuthParameter,
+            Map<String, String> headers,
+            String canonicalizedHeaders,
+            String canonicalizedResource) {
+        StringBuilder sb = new StringBuilder();
+
+        // HTTPMethod
+        sb.append(restAuthParameter.method()).append("\n");
+
+        // Accept
+        String accept = headers.getOrDefault(ACCEPT_HEADER, "");
+        sb.append(accept).append("\n");
+
+        // Content-MD5
+        String contentMd5 = headers.getOrDefault(CONTENT_MD5_HEADER, "");
+        sb.append(contentMd5).append("\n");
+
+        // Content-Type
+        String contentType = headers.getOrDefault(CONTENT_TYPE_HEADER, "");
+        sb.append(contentType).append("\n");
+
+        // Date
+        String date = headers.get(DATE_HEADER);
+        sb.append(date).append("\n");
+
+        // CanonicalizedHeaders
+        sb.append(canonicalizedHeaders);
+
+        // CanonicalizedResource
+        sb.append(canonicalizedResource);
+
+        return sb.toString();
+    }
+
+    private static String calculateSignature(String stringToSign, String 
accessKeySecret)
+            throws Exception {
+        Mac mac = Mac.getInstance(HMAC_SHA1);
+        SecretKeySpec secretKeySpec =
+                new 
SecretKeySpec(accessKeySecret.getBytes(StandardCharsets.UTF_8), HMAC_SHA1);
+        mac.init(secretKeySpec);
+        byte[] signatureBytes = 
mac.doFinal(stringToSign.getBytes(StandardCharsets.UTF_8));
+        return Base64.getEncoder().encodeToString(signatureBytes);
+    }
+
+    private static String md5Base64(String data) throws Exception {
+        MessageDigest md = MessageDigest.getInstance("MD5");
+        byte[] md5Bytes = md.digest(data.getBytes(StandardCharsets.UTF_8));
+        return Base64.getEncoder().encodeToString(md5Bytes);
+    }
+}
diff --git 
a/paimon-api/src/main/java/org/apache/paimon/rest/auth/DLFRequestSigner.java 
b/paimon-api/src/main/java/org/apache/paimon/rest/auth/DLFRequestSigner.java
new file mode 100644
index 0000000000..c554cf11f7
--- /dev/null
+++ b/paimon-api/src/main/java/org/apache/paimon/rest/auth/DLFRequestSigner.java
@@ -0,0 +1,66 @@
+/*
+ * 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.rest.auth;
+
+import javax.annotation.Nullable;
+
+import java.time.Instant;
+import java.util.Map;
+
+/**
+ * Interface for DLF request signers. Different signers implement different 
signature algorithms
+ * (e.g., DLF4-HMAC-SHA256, ROA v2 HMAC-SHA1).
+ */
+public interface DLFRequestSigner {
+
+    /**
+     * Generate signature headers for the request.
+     *
+     * @param body request body (can be null for GET requests)
+     * @param now current timestamp
+     * @param securityToken security token (can be null)
+     * @param host request host
+     * @return map of signature-related headers
+     */
+    Map<String, String> signHeaders(
+            @Nullable String body, Instant now, @Nullable String 
securityToken, String host);
+
+    /**
+     * Generate the Authorization header value.
+     *
+     * @param restAuthParameter request parameters (method, path, query, body)
+     * @param token DLF token (access key id, secret, security token)
+     * @param host request host
+     * @param signHeaders headers generated by {@link #signHeaders}
+     * @return Authorization header value
+     */
+    String authorization(
+            RESTAuthParameter restAuthParameter,
+            DLFToken token,
+            String host,
+            Map<String, String> signHeaders)
+            throws Exception;
+
+    /**
+     * Get the identifier for this signer (e.g., "default", "openapi").
+     *
+     * @return signer identifier
+     */
+    String identifier();
+}
diff --git 
a/paimon-api/src/test/java/org/apache/paimon/rest/auth/DLFRequestSignerTest.java
 
b/paimon-api/src/test/java/org/apache/paimon/rest/auth/DLFRequestSignerTest.java
new file mode 100644
index 0000000000..9a078ae790
--- /dev/null
+++ 
b/paimon-api/src/test/java/org/apache/paimon/rest/auth/DLFRequestSignerTest.java
@@ -0,0 +1,220 @@
+/*
+ * 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.rest.auth;
+
+import org.junit.jupiter.api.Test;
+
+import java.time.Instant;
+import java.time.ZoneOffset;
+import java.time.ZonedDateTime;
+import java.util.HashMap;
+import java.util.Map;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+/** Test for {@link DLFRequestSigner}. */
+public class DLFRequestSignerTest {
+
+    @Test
+    public void testOpenApiSignHeadersWithBody() throws Exception {
+        DLFOpenApiSigner signer = new DLFOpenApiSigner();
+        String body = 
"{\"CategoryName\":\"test\",\"CategoryType\":\"UNSTRUCTURED\"}";
+        Instant now = ZonedDateTime.of(2025, 4, 16, 3, 44, 46, 0, 
ZoneOffset.UTC).toInstant();
+        String host = "dlfnext.cn-beijing.aliyuncs.com";
+
+        Map<String, String> headers = signer.signHeaders(body, now, null, 
host);
+
+        assertNotNull(headers.get("Date"));
+        assertEquals("application/json", headers.get("Accept"));
+        assertNotNull(headers.get("Content-MD5"));
+        assertEquals("application/json", headers.get("Content-Type"));
+        assertEquals(host, headers.get("Host"));
+        assertEquals("HMAC-SHA1", headers.get("x-acs-signature-method"));
+        assertNotNull(headers.get("x-acs-signature-nonce"));
+        assertEquals("1.0", headers.get("x-acs-signature-version"));
+        assertEquals("2026-01-18", headers.get("x-acs-version"));
+    }
+
+    @Test
+    public void testOpenApiSignHeadersWithoutBody() throws Exception {
+        DLFOpenApiSigner signer = new DLFOpenApiSigner();
+        Instant now = ZonedDateTime.of(2025, 4, 16, 3, 44, 46, 0, 
ZoneOffset.UTC).toInstant();
+        String host = "dlfnext.cn-beijing.aliyuncs.com";
+
+        Map<String, String> headers = signer.signHeaders(null, now, null, 
host);
+
+        assertNotNull(headers.get("Date"));
+        assertEquals("application/json", headers.get("Accept"));
+        // Content-MD5 and Content-Type should not be present for empty body
+        assertTrue(!headers.containsKey("Content-MD5") || 
headers.get("Content-MD5").isEmpty());
+        assertTrue(!headers.containsKey("Content-Type") || 
headers.get("Content-Type").isEmpty());
+        assertEquals(host, headers.get("Host"));
+    }
+
+    @Test
+    public void testOpenApiSignHeadersWithSecurityToken() throws Exception {
+        DLFOpenApiSigner signer = new DLFOpenApiSigner();
+        Instant now = Instant.now();
+        String host = "dlfnext.cn-beijing.aliyuncs.com";
+        String securityToken = "test-security-token";
+
+        Map<String, String> headers = signer.signHeaders(null, now, 
securityToken, host);
+
+        assertEquals(securityToken, headers.get("x-acs-security-token"));
+    }
+
+    @Test
+    public void testOpenApiAuthorization() throws Exception {
+        DLFOpenApiSigner signer = new DLFOpenApiSigner();
+        String host = "dlfnext.cn-beijing.aliyuncs.com";
+        DLFToken token =
+                new DLFToken("YourAccessKeyId", "YourAccessKeySecret", 
"securityToken", null);
+
+        // Fixed timestamp for deterministic test
+        Instant now = ZonedDateTime.of(2025, 4, 16, 3, 44, 46, 0, 
ZoneOffset.UTC).toInstant();
+        String body = 
"{\"CategoryName\":\"test\",\"CategoryType\":\"UNSTRUCTURED\"}";
+
+        Map<String, String> signHeaders =
+                signer.signHeaders(body, now, token.getSecurityToken(), host);
+
+        // Create a fixed nonce for deterministic test
+        signHeaders.put("x-acs-signature-nonce", 
"ef34aae7-7bd2-413d-a541-680cd2c48538");
+
+        Map<String, String> parameters = new HashMap<>();
+        String path = "/llm-p2e4XXXXXXXXsvtn/datacenter/category";
+        RESTAuthParameter restAuthParameter = new RESTAuthParameter(path, 
parameters, "POST", body);
+
+        String authorization = signer.authorization(restAuthParameter, token, 
host, signHeaders);
+
+        // Verify Authorization format: acs AccessKeyId:Signature
+        assertTrue(authorization.startsWith("acs " + token.getAccessKeyId() + 
":"));
+        String signature =
+                authorization.substring(("acs " + token.getAccessKeyId() + 
":").length());
+        assertNotNull(signature);
+        // Signature should be base64 encoded
+        assertTrue(signature.length() > 0);
+    }
+
+    @Test
+    public void testOpenApiCanonicalizedHeaders() throws Exception {
+        DLFOpenApiSigner signer = new DLFOpenApiSigner();
+        String host = "dlfnext.cn-beijing.aliyuncs.com";
+        DLFToken token = new DLFToken("YourAccessKeyId", 
"YourAccessKeySecret", null, null);
+
+        Instant now = ZonedDateTime.of(2025, 4, 16, 3, 44, 46, 0, 
ZoneOffset.UTC).toInstant();
+        Map<String, String> signHeaders = signer.signHeaders(null, now, null, 
host);
+
+        // Set fixed nonce for deterministic test
+        signHeaders.put("x-acs-signature-nonce", 
"ef34aae7-7bd2-413d-a541-680cd2c48538");
+
+        RESTAuthParameter restAuthParameter =
+                new RESTAuthParameter("/test/path", new HashMap<>(), "GET", 
null);
+
+        String authorization = signer.authorization(restAuthParameter, token, 
host, signHeaders);
+
+        // Verify that authorization is generated
+        assertNotNull(authorization);
+        assertTrue(authorization.startsWith("acs "));
+    }
+
+    @Test
+    public void testOpenApiCanonicalizedResourceWithQueryParams() throws 
Exception {
+        DLFOpenApiSigner signer = new DLFOpenApiSigner();
+        String host = "dlfnext.cn-beijing.aliyuncs.com";
+        DLFToken token = new DLFToken("YourAccessKeyId", 
"YourAccessKeySecret", null, null);
+
+        Instant now = Instant.now();
+        Map<String, String> signHeaders = signer.signHeaders(null, now, null, 
host);
+
+        Map<String, String> queryParams = new HashMap<>();
+        queryParams.put("k2", "v2");
+        queryParams.put("k1", "v1");
+
+        RESTAuthParameter restAuthParameter =
+                new RESTAuthParameter("/test/path", queryParams, "GET", null);
+
+        String authorization = signer.authorization(restAuthParameter, token, 
host, signHeaders);
+
+        // Verify that authorization is generated with query params
+        assertNotNull(authorization);
+        assertTrue(authorization.startsWith("acs "));
+    }
+
+    @Test
+    public void testIdentifier() {
+        DLFDefaultSigner defaultSigner = new DLFDefaultSigner("region");
+        assertEquals(DLFDefaultSigner.IDENTIFIER, defaultSigner.identifier());
+
+        DLFOpenApiSigner signer = new DLFOpenApiSigner();
+        assertEquals(DLFOpenApiSigner.IDENTIFIER, signer.identifier());
+    }
+
+    @Test
+    public void testDlfNextEndpoint() {
+        assertEquals(
+                DLFOpenApiSigner.IDENTIFIER,
+                
DLFAuthProviderFactory.parseSigningAlgoFromUri("dlfnext.cn-hangzhou.aliyuncs.com"));
+        assertEquals(
+                DLFOpenApiSigner.IDENTIFIER,
+                DLFAuthProviderFactory.parseSigningAlgoFromUri(
+                        "dlfnext-vpc.cn-hangzhou.aliyuncs.com"));
+        assertEquals(
+                DLFOpenApiSigner.IDENTIFIER,
+                DLFAuthProviderFactory.parseSigningAlgoFromUri(
+                        "https://dlfnext.cn-hangzhou.aliyuncs.com";));
+    }
+
+    @Test
+    public void testDlfEndpoint() {
+        assertEquals(
+                DLFDefaultSigner.IDENTIFIER,
+                
DLFAuthProviderFactory.parseSigningAlgoFromUri("cn-hangzhou-vpc.dlf.aliyuncs.com"));
+        assertEquals(
+                DLFDefaultSigner.IDENTIFIER,
+                DLFAuthProviderFactory.parseSigningAlgoFromUri(
+                        "cn-hangzhou-intranet.dlf.aliyuncs.com"));
+        assertEquals(
+                DLFDefaultSigner.IDENTIFIER,
+                DLFAuthProviderFactory.parseSigningAlgoFromUri(
+                        "https://cn-hangzhou-vpc.dlf.aliyuncs.com";));
+    }
+
+    @Test
+    public void testUnknownEndpoint() {
+        assertEquals(
+                DLFDefaultSigner.IDENTIFIER,
+                
DLFAuthProviderFactory.parseSigningAlgoFromUri("unknown.example.com"));
+        assertEquals(
+                DLFDefaultSigner.IDENTIFIER,
+                DLFAuthProviderFactory.parseSigningAlgoFromUri("127.0.0.1"));
+        assertEquals(
+                DLFDefaultSigner.IDENTIFIER,
+                
DLFAuthProviderFactory.parseSigningAlgoFromUri("http://127.0.0.1:8080";));
+    }
+
+    @Test
+    public void testEmptyHost() {
+        assertEquals(
+                DLFDefaultSigner.IDENTIFIER, 
DLFAuthProviderFactory.parseSigningAlgoFromUri(""));
+        assertEquals(
+                DLFDefaultSigner.IDENTIFIER, 
DLFAuthProviderFactory.parseSigningAlgoFromUri(null));
+    }
+}
diff --git 
a/paimon-core/src/test/java/org/apache/paimon/rest/MockRESTCatalogTest.java 
b/paimon-core/src/test/java/org/apache/paimon/rest/MockRESTCatalogTest.java
index 85e7a27e61..5d4f8dfc46 100644
--- a/paimon-core/src/test/java/org/apache/paimon/rest/MockRESTCatalogTest.java
+++ b/paimon-core/src/test/java/org/apache/paimon/rest/MockRESTCatalogTest.java
@@ -37,6 +37,7 @@ import org.apache.paimon.rest.auth.AuthProvider;
 import org.apache.paimon.rest.auth.AuthProviderEnum;
 import org.apache.paimon.rest.auth.BearTokenAuthProvider;
 import org.apache.paimon.rest.auth.DLFAuthProvider;
+import org.apache.paimon.rest.auth.DLFDefaultSigner;
 import org.apache.paimon.rest.auth.DLFTokenLoader;
 import org.apache.paimon.rest.auth.DLFTokenLoaderFactory;
 import org.apache.paimon.rest.auth.RESTAuthParameter;
@@ -121,8 +122,11 @@ class MockRESTCatalogTest extends RESTCatalogTest {
         String akId = "akId" + UUID.randomUUID();
         String akSecret = "akSecret" + UUID.randomUUID();
         String securityToken = "securityToken" + UUID.randomUUID();
+        String uri = "https://cn-hangzhou-vpc.dlf.aliyuncs.com";;
         String region = "cn-hangzhou";
-        this.authProvider = DLFAuthProvider.fromAccessKey(akId, akSecret, 
securityToken, region);
+        this.authProvider =
+                DLFAuthProvider.fromAccessKey(
+                        akId, akSecret, securityToken, uri, region, 
DLFDefaultSigner.IDENTIFIER);
         this.authMap =
                 ImmutableMap.of(
                         RESTCatalogOptions.TOKEN_PROVIDER.key(), 
AuthProviderEnum.DLF.identifier(),
@@ -136,6 +140,7 @@ class MockRESTCatalogTest extends RESTCatalogTest {
 
     @Test
     void testDlfStSTokenPathAuth() throws Exception {
+        String uri = "https://cn-hangzhou-vpc.dlf.aliyuncs.com";;
         String region = "cn-hangzhou";
         String tokenPath = dataPath + UUID.randomUUID();
         generateTokenAndWriteToFile(tokenPath);
@@ -145,7 +150,9 @@ class MockRESTCatalogTest extends RESTCatalogTest {
                         new Options(
                                 ImmutableMap.of(
                                         
RESTCatalogOptions.DLF_TOKEN_PATH.key(), tokenPath)));
-        this.authProvider = DLFAuthProvider.fromTokenLoader(tokenLoader, 
region);
+        this.authProvider =
+                DLFAuthProvider.fromTokenLoader(
+                        tokenLoader, uri, region, DLFDefaultSigner.IDENTIFIER);
         this.authMap =
                 ImmutableMap.of(
                         RESTCatalogOptions.TOKEN_PROVIDER.key(), 
AuthProviderEnum.DLF.identifier(),
diff --git 
a/paimon-core/src/test/java/org/apache/paimon/rest/auth/AuthProviderTest.java 
b/paimon-core/src/test/java/org/apache/paimon/rest/auth/AuthProviderTest.java
index cbabd69037..bb9c6af638 100644
--- 
a/paimon-core/src/test/java/org/apache/paimon/rest/auth/AuthProviderTest.java
+++ 
b/paimon-core/src/test/java/org/apache/paimon/rest/auth/AuthProviderTest.java
@@ -351,24 +351,23 @@ public class AuthProviderTest {
         String[] credentials = authorization.split(",")[0].split(" 
")[1].split("/");
         String dateTime = header.get(DLF_DATE_HEADER_KEY);
         String date = credentials[1];
+        DLFDefaultSigner signer = new DLFDefaultSigner("cn-hangzhou");
         String newAuthorization =
-                DLFAuthSignature.getAuthorization(
+                signer.authorization(
                         new RESTAuthParameter("/path", parameters, "method", 
"data"),
                         token,
-                        "cn-hangzhou",
-                        header,
-                        dateTime,
-                        date);
+                        "host",
+                        header);
         assertEquals(newAuthorization, authorization);
         assertEquals(
                 token.getSecurityToken(),
                 header.get(DLFAuthProvider.DLF_SECURITY_TOKEN_HEADER_KEY));
         assertTrue(header.containsKey(DLF_DATE_HEADER_KEY));
         assertEquals(
-                DLFAuthSignature.VERSION, 
header.get(DLFAuthProvider.DLF_AUTH_VERSION_HEADER_KEY));
+                DLFDefaultSigner.VERSION, 
header.get(DLFAuthProvider.DLF_AUTH_VERSION_HEADER_KEY));
         assertEquals(DLFAuthProvider.MEDIA_TYPE, 
header.get(DLFAuthProvider.DLF_CONTENT_TYPE_KEY));
-        assertEquals(
-                DLFAuthSignature.md5(data), 
header.get(DLFAuthProvider.DLF_CONTENT_MD5_HEADER_KEY));
+        // Verify MD5 by checking it matches what's in the header
+        
assertTrue(header.containsKey(DLFAuthProvider.DLF_CONTENT_MD5_HEADER_KEY));
         assertEquals(
                 DLFAuthProvider.DLF_CONTENT_SHA56_VALUE,
                 header.get(DLFAuthProvider.DLF_CONTENT_SHA56_HEADER_KEY));
diff --git 
a/paimon-core/src/test/java/org/apache/paimon/rest/auth/DLFAuthSignatureTest.java
 
b/paimon-core/src/test/java/org/apache/paimon/rest/auth/DLFAuthSignatureTest.java
index 6292173b6f..f317ae256e 100644
--- 
a/paimon-core/src/test/java/org/apache/paimon/rest/auth/DLFAuthSignatureTest.java
+++ 
b/paimon-core/src/test/java/org/apache/paimon/rest/auth/DLFAuthSignatureTest.java
@@ -28,7 +28,7 @@ import java.util.Map;
 
 import static org.junit.jupiter.api.Assertions.assertEquals;
 
-/** Test for {@link DLFAuthSignature}. */
+/** Test for {@link DLFDefaultSigner}. */
 public class DLFAuthSignatureTest {
 
     @Test
@@ -43,12 +43,14 @@ public class DLFAuthSignatureTest {
         RESTAuthParameter restAuthParameter =
                 new RESTAuthParameter("/v1/paimon/databases", parameters, 
"POST", data);
         DLFToken token = new DLFToken("access-key-id", "access-key-secret", 
"securityToken", null);
+        DLFDefaultSigner signer = new DLFDefaultSigner(region);
         Map<String, String> signHeaders =
-                DLFAuthProvider.generateSignHeaders(
-                        restAuthParameter.data(), dateTime, "securityToken");
-        String authorization =
-                DLFAuthSignature.getAuthorization(
-                        restAuthParameter, token, region, signHeaders, 
dateTime, date);
+                signer.signHeaders(
+                        data,
+                        java.time.Instant.parse("2023-12-03T12:12:12Z"),
+                        "securityToken",
+                        "host");
+        String authorization = signer.authorization(restAuthParameter, token, 
"host", signHeaders);
         assertEquals(
                 "DLF4-HMAC-SHA256 
Credential=access-key-id/20231203/cn-hangzhou/DlfNext/aliyun_v4_request,Signature=c72caf1d40b55b1905d891ee3e3de48a2f8bebefa7e39e4f277acc93c269c5e3",
                 authorization);

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