tpalfy commented on a change in pull request #5319: URL: https://github.com/apache/nifi/pull/5319#discussion_r702830329
########## File path: nifi-nar-bundles/nifi-standard-services/nifi-oauth2-provider-bundle/nifi-oauth2-provider-service/src/main/java/org/apache/nifi/oauth2/StandardOauth2AccessTokenProvider.java ########## @@ -0,0 +1,300 @@ +/* + * 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.nifi.oauth2; + +import com.fasterxml.jackson.databind.DeserializationFeature; +import com.fasterxml.jackson.databind.ObjectMapper; +import com.fasterxml.jackson.databind.PropertyNamingStrategies; +import okhttp3.FormBody; +import okhttp3.OkHttpClient; +import okhttp3.Request; +import okhttp3.RequestBody; +import okhttp3.Response; +import org.apache.nifi.annotation.documentation.CapabilityDescription; +import org.apache.nifi.annotation.documentation.Tags; +import org.apache.nifi.annotation.lifecycle.OnDisabled; +import org.apache.nifi.annotation.lifecycle.OnEnabled; +import org.apache.nifi.components.AllowableValue; +import org.apache.nifi.components.PropertyDescriptor; +import org.apache.nifi.components.ValidationContext; +import org.apache.nifi.components.ValidationResult; +import org.apache.nifi.components.Validator; +import org.apache.nifi.controller.AbstractControllerService; +import org.apache.nifi.controller.ConfigurationContext; +import org.apache.nifi.expression.ExpressionLanguageScope; +import org.apache.nifi.processor.exception.ProcessException; +import org.apache.nifi.processor.util.StandardValidators; +import org.apache.nifi.ssl.SSLContextService; + +import javax.net.ssl.SSLContext; +import javax.net.ssl.X509TrustManager; +import java.io.IOException; +import java.io.UncheckedIOException; +import java.util.ArrayList; +import java.util.Arrays; +import java.util.Collection; +import java.util.Collections; +import java.util.List; + +@Tags({"oauth2", "provider", "authorization", "access token", "http"}) +@CapabilityDescription("Provides OAuth 2.0 access tokens that can be used as Bearer authorization header in HTTP requests." + + " Uses Resource Owner Password Credentials Grant.") +public class StandardOauth2AccessTokenProvider extends AbstractControllerService implements OAuth2AccessTokenProvider { + public static final PropertyDescriptor AUTHORIZATION_SERVER_URL = new PropertyDescriptor.Builder() + .name("authorization-server-url") + .displayName("Authorization Server URL") + .description("The URL of the authorization server that issues access tokens.") + .required(true) + .addValidator(StandardValidators.URL_VALIDATOR) + .expressionLanguageSupported(ExpressionLanguageScope.VARIABLE_REGISTRY) + .build(); + + public static AllowableValue RESOURCE_OWNER_PASSWORD_CREDENTIALS_GRANT_TYPE = new AllowableValue( + "password", + "User Password", + "Resource Owner Password Credentials Grant. Used to access resources available to users. Requires username and password and usually Client ID and Client Secret" + ); + public static AllowableValue CLIENT_CREDENTIALS_GRANT_TYPE = new AllowableValue( + "client_credentials", + "Client Credentials", + "Client Credentials Grant. Used to access resources available to clients. Requires Client ID and Client Secret" + ); + + public static final PropertyDescriptor GRANT_TYPE = new PropertyDescriptor.Builder() + .name("grant-type") + .displayName("Grant Type") + .description("The OAuth2 Grant Type to be used when acquiring an access token.") + .required(true) + .allowableValues(RESOURCE_OWNER_PASSWORD_CREDENTIALS_GRANT_TYPE, CLIENT_CREDENTIALS_GRANT_TYPE) + .defaultValue(RESOURCE_OWNER_PASSWORD_CREDENTIALS_GRANT_TYPE.getValue()) + .build(); + + public static final PropertyDescriptor USERNAME = new PropertyDescriptor.Builder() + .name("service-user-name") + .displayName("Username") + .description("Username on the service that is being accessed.") + .dependsOn(GRANT_TYPE, RESOURCE_OWNER_PASSWORD_CREDENTIALS_GRANT_TYPE) + .required(true) + .addValidator(StandardValidators.NON_BLANK_VALIDATOR) + .expressionLanguageSupported(ExpressionLanguageScope.VARIABLE_REGISTRY) + .build(); + + public static final PropertyDescriptor PASSWORD = new PropertyDescriptor.Builder() + .name("service-password") + .displayName("Password") + .description("Password for the username on the service that is being accessed.") + .dependsOn(GRANT_TYPE, RESOURCE_OWNER_PASSWORD_CREDENTIALS_GRANT_TYPE) + .required(true) + .sensitive(true) + .addValidator(StandardValidators.NON_BLANK_VALIDATOR) + .build(); + + public static final PropertyDescriptor CLIENT_ID = new PropertyDescriptor.Builder() + .name("client-id") + .displayName("Client ID") + .required(false) + .addValidator(StandardValidators.NON_BLANK_VALIDATOR) + .expressionLanguageSupported(ExpressionLanguageScope.VARIABLE_REGISTRY) + .build(); + + public static final PropertyDescriptor CLIENT_SECRET = new PropertyDescriptor.Builder() + .name("client-secret") + .displayName("Client secret") + .dependsOn(CLIENT_ID) + .required(true) + .sensitive(true) + .addValidator(StandardValidators.NON_BLANK_VALIDATOR) + .build(); + + public static final PropertyDescriptor SSL_CONTEXT = new PropertyDescriptor.Builder() + .name("ssl-context") + .displayName("SSL Context") + .addValidator(Validator.VALID) + .identifiesControllerService(SSLContextService.class) + .required(false) + .build(); + + private static final List<PropertyDescriptor> PROPERTIES = Collections.unmodifiableList(Arrays.asList( + AUTHORIZATION_SERVER_URL, + GRANT_TYPE, + USERNAME, + PASSWORD, + CLIENT_ID, + CLIENT_SECRET, + SSL_CONTEXT + )); + + public static final ObjectMapper ACCESS_DETAILS_MAPPER = new ObjectMapper() + .configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false) + .setPropertyNamingStrategy(PropertyNamingStrategies.SNAKE_CASE); + + private volatile String authorizationServerUrl; + private volatile OkHttpClient httpClient; + + private volatile String grantType; + private volatile String username; + private volatile String password; + private volatile String clientId; + private volatile String clientSecret; + + private volatile AccessToken accessDetails; + + @Override + public List<PropertyDescriptor> getSupportedPropertyDescriptors() { + return PROPERTIES; + } + + @OnEnabled + public void onEnabled(ConfigurationContext context) { + authorizationServerUrl = context.getProperty(AUTHORIZATION_SERVER_URL).evaluateAttributeExpressions().getValue(); + + httpClient = createHttpClient(context); + + grantType = context.getProperty(GRANT_TYPE).getValue(); + username = context.getProperty(USERNAME).evaluateAttributeExpressions().getValue(); + password = context.getProperty(PASSWORD).getValue(); + clientId = context.getProperty(CLIENT_ID).evaluateAttributeExpressions().getValue(); + clientSecret = context.getProperty(CLIENT_SECRET).getValue(); + } + + @OnDisabled + public void onDisabled() { + accessDetails = null; + } + + @Override + protected Collection<ValidationResult> customValidate(ValidationContext validationContext) { + final List<ValidationResult> validationResults = new ArrayList<>(super.customValidate(validationContext)); + + if ( + validationContext.getProperty(GRANT_TYPE).getValue().equals(CLIENT_CREDENTIALS_GRANT_TYPE.getValue()) + && !validationContext.getProperty(CLIENT_ID).isSet() + ) { + validationResults.add(new ValidationResult.Builder().subject(CLIENT_ID.getDisplayName()) + .valid(false) + .explanation(String.format( + "When '%s' is set to '%s', '%s' is required", + GRANT_TYPE.getDisplayName(), + CLIENT_CREDENTIALS_GRANT_TYPE.getDisplayName(), + CLIENT_ID.getDisplayName()) + ) + .build()); + } + + return validationResults; + } + + protected OkHttpClient createHttpClient(ConfigurationContext context) { + OkHttpClient.Builder clientBuilder = new OkHttpClient.Builder(); + + SSLContextService sslService = context.getProperty(SSL_CONTEXT).asControllerService(SSLContextService.class); + if (sslService != null) { + final X509TrustManager trustManager = sslService.createTrustManager(); + SSLContext sslContext = sslService.createContext(); + clientBuilder.sslSocketFactory(sslContext.getSocketFactory(), trustManager); + } + + return clientBuilder.build(); + } + + @Override + public AccessToken getAccessDetails() { + if (this.accessDetails == null) { + acquireAccessDetails(); + } else if (this.accessDetails.isExpired()) { + if (this.accessDetails.getRefreshToken() == null) { + acquireAccessDetails(); + } else { + try { + refreshAccessDetails(); + } catch (Exception e) { + getLogger().info("Couldn't refresh access token.", e); + acquireAccessDetails(); + } + } + } + + return accessDetails; + } + + private void acquireAccessDetails() { + getLogger().debug("Getting a new access token."); Review comment: Can do -- This is an automated message from the Apache Git Service. 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