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| ## [Unreleased] | ||
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| ### Added | ||
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| - Added support for OIDC Bearer tokens. | ||
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| ## [0.15.0] - 2024-07-30 | ||
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| ### Added | ||
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148 changes: 148 additions & 0 deletions
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src/main/java/com/getindata/connectors/http/internal/auth/OidcAccessTokenManager.java
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| /* | ||
| * Copyright 2020 Red Hat | ||
| * | ||
| * 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. | ||
| */ | ||
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| package com.getindata.connectors.http.internal.auth; | ||
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| import java.io.IOException; | ||
| import java.net.URI; | ||
| import java.net.http.HttpClient; | ||
| import java.net.http.HttpRequest; | ||
| import java.net.http.HttpResponse; | ||
| import java.time.Duration; | ||
| import java.time.Instant; | ||
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| import org.apache.flink.shaded.jackson2.com.fasterxml.jackson.core.JsonProcessingException; | ||
| import org.apache.flink.shaded.jackson2.com.fasterxml.jackson.databind.JsonNode; | ||
| import org.apache.flink.shaded.jackson2.com.fasterxml.jackson.databind.ObjectMapper; | ||
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| /** | ||
| * This class is inspired by | ||
| * https://github.com/Apicurio/apicurio-common-rest-client/blob/ | ||
| * 944ac9eb527c291a6083bd10ee012388e1684d20/rest-client-common/src/main/java/io/ | ||
| * apicurio/rest/client/auth/OidcAuth.java. | ||
| * | ||
| * The OIDC access token manager encapsulates the caching of an OIDC access token, | ||
| * which can be short lived, for example an hour. The authenticate method will return an | ||
| * un-expired access token, either from the cache or by requesting a new access token. | ||
| */ | ||
| public class OidcAccessTokenManager { | ||
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| private static final Duration DEFAULT_TOKEN_EXPIRATION_REDUCTION = Duration.ofSeconds(1); | ||
| private final HttpClient httpClient; | ||
| private final String tokenRequest; | ||
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| private final String url; | ||
| private final Duration tokenExpirationReduction; | ||
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| private String cachedAccessToken; | ||
| private Instant cachedAccessTokenExp; | ||
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| /** | ||
| * Construct an Oidc access token manager with the default token expiration reduction | ||
| * @param httpClient httpClient to use to call the token endpoint. | ||
| * @param tokenRequest token request | ||
| * @param url token endpoint url | ||
| */ | ||
| public OidcAccessTokenManager(HttpClient httpClient, String tokenRequest, String url) { | ||
| this(httpClient, tokenRequest, url, DEFAULT_TOKEN_EXPIRATION_REDUCTION); | ||
| } | ||
| /** | ||
| * Construct an Oidc access token manager with the supplied token expiration reduction | ||
| * @param httpClient httpClient to use to call the token endpoint. | ||
| * @param tokenRequest token request this need to be form urlencoded | ||
| * @param url token endpoint url | ||
| * @param tokenExpirationReduction token expiry reduction, request a new token if the | ||
| * current time is later than the cached access token | ||
| * expiry time reduced by this value. This means that | ||
| * we will not use the cached token if it is about | ||
| * to expire. | ||
| */ | ||
| public OidcAccessTokenManager(HttpClient httpClient, String tokenRequest, String url, | ||
| Duration tokenExpirationReduction) { | ||
| this.tokenRequest = tokenRequest; | ||
| this.httpClient = httpClient; | ||
| this.url = url; | ||
| if (null == tokenExpirationReduction) { | ||
| this.tokenExpirationReduction = DEFAULT_TOKEN_EXPIRATION_REDUCTION; | ||
| } else { | ||
| this.tokenExpirationReduction = tokenExpirationReduction; | ||
| } | ||
| } | ||
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| /** | ||
| * Request an access token from the token endpoint | ||
| */ | ||
| private void requestAccessToken() { | ||
| try { | ||
| HttpRequest httpRequest = | ||
| HttpRequest.newBuilder() | ||
| .uri(URI.create(url)) | ||
| .header("Content-Type", "application/x-www-form-urlencoded") | ||
| .method("POST", HttpRequest.BodyPublishers.ofString(tokenRequest)) | ||
| .build(); | ||
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| HttpResponse<byte[]> response = httpClient.send(httpRequest, | ||
| HttpResponse.BodyHandlers.ofByteArray()); | ||
| //create ObjectMapper instance | ||
| ObjectMapper objectMapper = new ObjectMapper(); | ||
| if (200 == response.statusCode()) { | ||
| byte[] bytes = response.body(); | ||
| JsonNode rootNode = objectMapper.readTree(bytes); | ||
| JsonNode tokenNode = rootNode.path("access_token"); | ||
| JsonNode expiresInNode = rootNode.path("expires_in"); | ||
| this.cachedAccessToken = tokenNode.textValue(); | ||
| /* | ||
| expiresIn is in seconds | ||
| */ | ||
| Duration expiresIn = Duration.ofSeconds(expiresInNode.asInt()); | ||
| if (expiresIn.compareTo(this.tokenExpirationReduction) > 0) { | ||
| //expiresIn is greater than tokenExpirationReduction | ||
| expiresIn = expiresIn.minus(this.tokenExpirationReduction); | ||
| } | ||
| this.cachedAccessTokenExp = Instant.now().plus(expiresIn); | ||
| } else { | ||
| throw new IllegalStateException("Attempted to get an access token but got http" + | ||
| " status code " + response.statusCode()); | ||
| } | ||
| } catch (JsonProcessingException e) { | ||
| throw new IllegalStateException("Error found while trying to request a new token"); | ||
| } catch (IOException e) { | ||
| throw new IllegalStateException("IO Exception occurred", e); | ||
| } catch (InterruptedException e) { | ||
| throw new IllegalStateException("Interrupted Exception occurred", e); | ||
| } | ||
| } | ||
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| /** | ||
| * Get a valid unexpired access token. | ||
| * @return access token. | ||
| */ | ||
| public String authenticate() { | ||
| if (isAccessTokenRequired()) { | ||
| requestAccessToken(); | ||
| } | ||
| return cachedAccessToken; | ||
| } | ||
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| private boolean isAccessTokenRequired() { | ||
| return null == cachedAccessToken || isTokenExpired(); | ||
| } | ||
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| private boolean isTokenExpired() { | ||
| return Instant.now().isAfter(this.cachedAccessTokenExp); | ||
| } | ||
| } |
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