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enrich-kafka: authenticate with Event Hubs using OAuth2 (close #863)
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103 changes: 103 additions & 0 deletions
103
...cala/com.snowplowanalytics.snowplow.enrich.kafka/AzureAuthenticationCallbackHandler.scala
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,103 @@ | ||
| /* | ||
| * Copyright (c) 2023-present Snowplow Analytics Ltd. | ||
| * All rights reserved. | ||
| * | ||
| * This software is made available by Snowplow Analytics, Ltd., | ||
| * under the terms of the Snowplow Limited Use License Agreement, Version 1.0 | ||
| * located at https://docs.snowplow.io/limited-use-license-1.0 | ||
| * BY INSTALLING, DOWNLOADING, ACCESSING, USING OR DISTRIBUTING ANY PORTION | ||
| * OF THE SOFTWARE, YOU AGREE TO THE TERMS OF SUCH LICENSE AGREEMENT. | ||
| */ | ||
| package com.snowplowanalytics.snowplow.enrich.kafka | ||
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| import java.net.URI | ||
| import java.{lang, util} | ||
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| import com.nimbusds.jwt.JWTParser | ||
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| import javax.security.auth.callback.Callback | ||
| import javax.security.auth.callback.UnsupportedCallbackException | ||
| import javax.security.auth.login.AppConfigurationEntry | ||
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| import org.apache.kafka.clients.CommonClientConfigs | ||
| import org.apache.kafka.common.security.auth.AuthenticateCallbackHandler | ||
| import org.apache.kafka.common.security.oauthbearer.OAuthBearerToken | ||
| import org.apache.kafka.common.security.oauthbearer.OAuthBearerTokenCallback | ||
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| import com.azure.identity.DefaultAzureCredentialBuilder | ||
| import com.azure.core.credential.TokenRequestContext | ||
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| // We need separate instances of callback handler with separate source and | ||
| // sinks because they need different tokens to authenticate. However we are | ||
| // only giving class name to Kafka and it initializes the class itself and if | ||
| // we pass same class name for all source and sinks, Kafka initializes and uses | ||
| // only one instance of the callback handler. To create separate instances, we | ||
| // created multiple different classes and pass their names to respective sink | ||
| // and source properties. With this way, all the source and sinks will have their | ||
| // own callback handler instance. | ||
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| class SourceAuthHandler extends AzureAuthenticationCallbackHandler | ||
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| class GoodSinkAuthHandler extends AzureAuthenticationCallbackHandler | ||
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| class BadSinkAuthHandler extends AzureAuthenticationCallbackHandler | ||
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| class PiiSinkAuthHandler extends AzureAuthenticationCallbackHandler | ||
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| class AzureAuthenticationCallbackHandler extends AuthenticateCallbackHandler { | ||
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| val credentials = new DefaultAzureCredentialBuilder().build() | ||
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| var sbUri: String = "" | ||
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| override def configure( | ||
| configs: util.Map[String, _], | ||
| saslMechanism: String, | ||
| jaasConfigEntries: util.List[AppConfigurationEntry] | ||
| ): Unit = { | ||
| val bootstrapServer = | ||
| configs | ||
| .get(CommonClientConfigs.BOOTSTRAP_SERVERS_CONFIG) | ||
| .toString | ||
| .replaceAll("\\[|\\]", "") | ||
| .split(",") | ||
| .toList | ||
| .headOption match { | ||
| case Some(s) => s | ||
| case None => throw new Exception("Empty bootstrap servers list") | ||
| } | ||
| val uri = URI.create("https://" + bootstrapServer) | ||
| // Workload identity works with '.default' scope | ||
| this.sbUri = s"${uri.getScheme}://${uri.getHost}/.default" | ||
| } | ||
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| override def handle(callbacks: Array[Callback]): Unit = | ||
| callbacks.foreach { | ||
| case callback: OAuthBearerTokenCallback => | ||
| val token = getOAuthBearerToken() | ||
| callback.token(token) | ||
| case callback => throw new UnsupportedCallbackException(callback) | ||
| } | ||
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| def getOAuthBearerToken(): OAuthBearerToken = { | ||
| val reqContext = new TokenRequestContext() | ||
| reqContext.addScopes(sbUri) | ||
| val accessToken = credentials.getTokenSync(reqContext).getToken | ||
| val jwt = JWTParser.parse(accessToken) | ||
| val claims = jwt.getJWTClaimsSet | ||
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| new OAuthBearerToken { | ||
| override def value(): String = accessToken | ||
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| override def lifetimeMs(): Long = claims.getExpirationTime.getTime | ||
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| override def scope(): util.Set[String] = null | ||
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| override def principalName(): String = null | ||
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| override def startTimeMs(): lang.Long = null | ||
| } | ||
| } | ||
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| override def close(): Unit = () | ||
| } |
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