Core: Add credentials to loadTable / loadView responses

core/src/main/java/org/apache/iceberg/rest/credentials/Credential.java

@@ -0,0 +1,36 @@
+/*
+ * 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.iceberg.rest.credentials;
+
+import java.util.Map;
+import org.apache.iceberg.relocated.com.google.common.base.Preconditions;
+import org.immutables.value.Value;
+
+@Value.Immutable
+public interface Credential {
+  String prefix();
+
+  Map<String, String> config();
+
+  @Value.Check
+  default void validate() {
+    Preconditions.checkArgument(!prefix().isEmpty(), "Invalid prefix: must be non-empty");
+    Preconditions.checkArgument(!config().isEmpty(), "Invalid config: must be non-empty");
+  }
+}

core/src/main/java/org/apache/iceberg/rest/credentials/CredentialParser.java

@@ -0,0 +1,63 @@
+/*
+ * 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.iceberg.rest.credentials;
+
+import com.fasterxml.jackson.core.JsonGenerator;
+import com.fasterxml.jackson.databind.JsonNode;
+import java.io.IOException;
+import java.util.Map;
+import org.apache.iceberg.relocated.com.google.common.base.Preconditions;
+import org.apache.iceberg.util.JsonUtil;
+
+public class CredentialParser {
+  private static final String PREFIX = "prefix";
+  private static final String CONFIG = "config";
+
+  private CredentialParser() {}
+
+  public static String toJson(Credential credential) {
+    return toJson(credential, false);
+  }
+
+  public static String toJson(Credential credential, boolean pretty) {
+    return JsonUtil.generate(gen -> toJson(credential, gen), pretty);
+  }
+
+  public static void toJson(Credential credential, JsonGenerator gen) throws IOException {
+    Preconditions.checkArgument(null != credential, "Invalid credential: null");
+
+    gen.writeStartObject();
+
+    gen.writeStringField(PREFIX, credential.prefix());
+    JsonUtil.writeStringMap(CONFIG, credential.config(), gen);
+
+    gen.writeEndObject();
+  }
+
+  public static Credential fromJson(String json) {
+    return JsonUtil.parse(json, CredentialParser::fromJson);
+  }
+
+  public static Credential fromJson(JsonNode json) {
+    Preconditions.checkArgument(null != json, "Cannot parse credential from null object");
+    String prefix = JsonUtil.getString(PREFIX, json);
+    Map<String, String> config = JsonUtil.getStringMap(CONFIG, json);
+    return ImmutableCredential.builder().prefix(prefix).config(config).build();
+  }
+}

core/src/main/java/org/apache/iceberg/rest/responses/LoadTableResponse.java

@@ -18,13 +18,17 @@
  */
 package org.apache.iceberg.rest.responses;
 
+import java.util.List;
 import java.util.Map;
 import org.apache.iceberg.TableMetadata;
 import org.apache.iceberg.relocated.com.google.common.base.MoreObjects;
 import org.apache.iceberg.relocated.com.google.common.base.Preconditions;
+import org.apache.iceberg.relocated.com.google.common.collect.ImmutableList;
 import org.apache.iceberg.relocated.com.google.common.collect.ImmutableMap;
+import org.apache.iceberg.relocated.com.google.common.collect.Lists;
 import org.apache.iceberg.relocated.com.google.common.collect.Maps;
 import org.apache.iceberg.rest.RESTResponse;
+import org.apache.iceberg.rest.credentials.Credential;
 
 /**
  * A REST response that is used when a table is successfully loaded.
@@ -40,16 +44,21 @@ public class LoadTableResponse implements RESTResponse {
   private TableMetadata metadata;
   private Map<String, String> config;
   private TableMetadata metadataWithLocation;
+  private List<Credential> credentials;
 
   public LoadTableResponse() {
     // Required for Jackson deserialization
   }
 
   private LoadTableResponse(
-      String metadataLocation, TableMetadata metadata, Map<String, String> config) {
+      String metadataLocation,
+      TableMetadata metadata,
+      Map<String, String> config,
+      List<Credential> credentials) {
     this.metadataLocation = metadataLocation;
     this.metadata = metadata;
     this.config = config;
+    this.credentials = credentials;
   }
 
   @Override
@@ -74,6 +83,10 @@ public Map<String, String> config() {
     return config != null ? config : ImmutableMap.of();
   }
 
+  public List<Credential> credentials() {
+    return credentials != null ? credentials : ImmutableList.of();
+  }
+
   @Override
   public String toString() {
     return MoreObjects.toStringHelper(this)
@@ -91,6 +104,7 @@ public static class Builder {
     private String metadataLocation;
     private TableMetadata metadata;
     private final Map<String, String> config = Maps.newHashMap();
+    private final List<Credential> credentials = Lists.newArrayList();
 
     private Builder() {}
 
@@ -110,9 +124,19 @@ public Builder addAllConfig(Map<String, String> properties) {
       return this;
     }
 
+    public Builder addCredential(Credential credential) {
+      credentials.add(credential);
+      return this;
+    }
+
+    public Builder addAllCredentials(List<Credential> credentialsToAdd) {
+      credentials.addAll(credentialsToAdd);
+      return this;
+    }
+
     public LoadTableResponse build() {
       Preconditions.checkNotNull(metadata, "Invalid metadata: null");
-      return new LoadTableResponse(metadataLocation, metadata, config);
+      return new LoadTableResponse(metadataLocation, metadata, config, credentials);
     }
   }
 }

core/src/main/java/org/apache/iceberg/rest/responses/LoadTableResponseParser.java

@@ -24,13 +24,16 @@
 import org.apache.iceberg.TableMetadata;
 import org.apache.iceberg.TableMetadataParser;
 import org.apache.iceberg.relocated.com.google.common.base.Preconditions;
+import org.apache.iceberg.rest.credentials.Credential;
+import org.apache.iceberg.rest.credentials.CredentialParser;
 import org.apache.iceberg.util.JsonUtil;
 
 public class LoadTableResponseParser {
 
   private static final String METADATA_LOCATION = "metadata-location";
   private static final String METADATA = "metadata";
   private static final String CONFIG = "config";
+  private static final String STORAGE_CREDENTIALS = "storage-credentials";
 
   private LoadTableResponseParser() {}
 
@@ -58,6 +61,15 @@ public static void toJson(LoadTableResponse response, JsonGenerator gen) throws
       JsonUtil.writeStringMap(CONFIG, response.config(), gen);
     }
 
+    if (!response.credentials().isEmpty()) {
+      gen.writeArrayFieldStart(STORAGE_CREDENTIALS);
+      for (Credential credential : response.credentials()) {
+        CredentialParser.toJson(credential, gen);
+      }
+
+      gen.writeEndArray();
+    }
+
     gen.writeEndObject();
   }
 
@@ -85,6 +97,16 @@ public static LoadTableResponse fromJson(JsonNode json) {
       builder.addAllConfig(JsonUtil.getStringMap(CONFIG, json));
     }
 
+    if (json.hasNonNull(STORAGE_CREDENTIALS)) {
+      JsonNode credentials = JsonUtil.get(STORAGE_CREDENTIALS, json);
+      Preconditions.checkArgument(
+          credentials.isArray(), "Cannot parse credentials from non-array: %s", credentials);
+
+      for (JsonNode credential : credentials) {
+        builder.addCredential(CredentialParser.fromJson(credential));
+      }
+    }
+
     return builder.build();
   }
 }

core/src/main/java/org/apache/iceberg/rest/responses/LoadViewResponse.java

@@ -18,8 +18,11 @@
  */
 package org.apache.iceberg.rest.responses;
 
+import java.util.List;
 import java.util.Map;
+import org.apache.iceberg.relocated.com.google.common.collect.ImmutableList;
 import org.apache.iceberg.rest.RESTResponse;
+import org.apache.iceberg.rest.credentials.Credential;
 import org.apache.iceberg.view.ViewMetadata;
 import org.immutables.value.Value;
 
@@ -31,6 +34,11 @@ public interface LoadViewResponse extends RESTResponse {
 
   Map<String, String> config();
 
+  @Value.Default
+  default List<Credential> credentials() {
+    return ImmutableList.of();
+  }
+
   @Override
   default void validate() {
     // nothing to validate as it's not possible to create an invalid instance

core/src/main/java/org/apache/iceberg/rest/responses/LoadViewResponseParser.java

@@ -22,6 +22,8 @@
 import com.fasterxml.jackson.databind.JsonNode;
 import java.io.IOException;
 import org.apache.iceberg.relocated.com.google.common.base.Preconditions;
+import org.apache.iceberg.rest.credentials.Credential;
+import org.apache.iceberg.rest.credentials.CredentialParser;
 import org.apache.iceberg.util.JsonUtil;
 import org.apache.iceberg.view.ViewMetadata;
 import org.apache.iceberg.view.ViewMetadataParser;
@@ -31,6 +33,7 @@ public class LoadViewResponseParser {
   private static final String METADATA_LOCATION = "metadata-location";
   private static final String METADATA = "metadata";
   private static final String CONFIG = "config";
+  private static final String STORAGE_CREDENTIALS = "storage-credentials";
 
   private LoadViewResponseParser() {}
 
@@ -56,6 +59,15 @@ public static void toJson(LoadViewResponse response, JsonGenerator gen) throws I
       JsonUtil.writeStringMap(CONFIG, response.config(), gen);
     }
 
+    if (!response.credentials().isEmpty()) {
+      gen.writeArrayFieldStart(STORAGE_CREDENTIALS);
+      for (Credential credential : response.credentials()) {
+        CredentialParser.toJson(credential, gen);
+      }
+
+      gen.writeEndArray();
+    }
+
     gen.writeEndObject();
   }
 
@@ -80,6 +92,16 @@ public static LoadViewResponse fromJson(JsonNode json) {
       builder.config(JsonUtil.getStringMap(CONFIG, json));
     }
 
+    if (json.hasNonNull(STORAGE_CREDENTIALS)) {
+      JsonNode credentials = JsonUtil.get(STORAGE_CREDENTIALS, json);
+      Preconditions.checkArgument(
+          credentials.isArray(), "Cannot parse credentials from non-array: %s", credentials);
+
+      for (JsonNode credential : credentials) {
+        builder.addCredentials(CredentialParser.fromJson(credential));
+      }
+    }
+
     return builder.build();
   }
 }