io.aiven.kafka.connect.gcs.GoogleCredentialsBuilder Maven / Gradle / Ivy
Show all versions of gcs-connector-for-apache-kafka Show documentation
/*
* Copyright 2020 Aiven Oy
*
* Licensed 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 io.aiven.kafka.connect.gcs;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URI;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Paths;
import com.google.auth.oauth2.GoogleCredentials;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public final class GoogleCredentialsBuilder {
private static final Logger LOG = LoggerFactory.getLogger(GoogleCredentialsBuilder.class);
private GoogleCredentialsBuilder() {
/* hide constructor */ }
/**
* Builds {@link GoogleCredentials} using the provided credentials path and credentials JSON.
*
*
* {@code credentialsPath} and {@code credentialsJson} are mutually exclusive. So if both are provided (are
* non-{@code null}), this is an error.
*
*
* If either @code credentialsPath} or {@code credentialsJson} is provided, it's used to construct the credentials.
*
*
* If none are provided, the default GCP SDK credentials acquisition mechanism is used.
*
* @param credentialsPath
* the credential path, can be {@code null}.
* @param credentialsJson
* the credential JSON string, can be {@code null}.
* @return a {@link GoogleCredentials} constructed based on the input.
* @throws IOException
* if some error getting the credentials happen.
* @throws IllegalArgumentException
* if both {@code credentialsPath} and {@code credentialsJson} are non-{@code null}.
*/
public static GoogleCredentials build(final String credentialsPath, final String credentialsJson)
throws IOException {
if (credentialsPath != null && credentialsJson != null) {
throw new IllegalArgumentException("Both credentialsPath and credentialsJson cannot be non-null.");
}
if (credentialsPath != null) {
LOG.debug("Using provided credentials path");
return getCredentialsFromPath(credentialsPath);
}
if (credentialsJson != null) {
LOG.debug("Using provided credentials JSON");
return getCredentialsFromJson(credentialsJson);
}
LOG.debug("Using default credentials");
return GoogleCredentials.getApplicationDefault();
}
private static GoogleCredentials getCredentialsFromPath(final String credentialsPath) throws IOException {
try (InputStream stream = Files
.newInputStream(Paths.get(URI.create(String.format("file://%s", credentialsPath))))) {
return GoogleCredentials.fromStream(stream);
} catch (final IOException e) {
throw new IOException("Failed to read GCS credentials from " + credentialsPath, e);
}
}
private static GoogleCredentials getCredentialsFromJson(final String credentialsJson) throws IOException {
try (InputStream stream = new ByteArrayInputStream(credentialsJson.getBytes(StandardCharsets.UTF_8))) {
return GoogleCredentials.fromStream(stream);
} catch (final IOException e) {
throw new IOException("Failed to read credentials from JSON string", e);
}
}
}