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76 changes: 76 additions & 0 deletions
76
immersion_tracker_api/src/main/java/com/jordansimsmith/immersiontracker/AuthHandler.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,76 @@ | ||
| package com.jordansimsmith.immersiontracker; | ||
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| import static com.jordansimsmith.immersiontracker.AuthHandler.AuthorizerEvent; | ||
| import static com.jordansimsmith.immersiontracker.AuthHandler.AuthorizerResponse; | ||
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| import com.amazonaws.services.lambda.runtime.Context; | ||
| import com.amazonaws.services.lambda.runtime.RequestHandler; | ||
| import com.fasterxml.jackson.core.JsonProcessingException; | ||
| import com.fasterxml.jackson.databind.ObjectMapper; | ||
| import com.google.common.annotations.VisibleForTesting; | ||
| import com.google.common.base.Strings; | ||
| import java.util.LinkedHashMap; | ||
| import software.amazon.awssdk.policybuilder.iam.IamEffect; | ||
| import software.amazon.awssdk.policybuilder.iam.IamPolicy; | ||
| import software.amazon.awssdk.policybuilder.iam.IamStatement; | ||
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| public class AuthHandler implements RequestHandler<AuthorizerEvent, AuthorizerResponse> { | ||
| private final ObjectMapper objectMapper; | ||
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| public record AuthorizerEvent(String authorizationToken, String methodArn) {} | ||
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| public record AuthorizerResponse(String principalId, Object policyDocument) {} | ||
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| public AuthHandler() { | ||
| this(ImmersionTrackerFactory.create()); | ||
| } | ||
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| @VisibleForTesting | ||
| AuthHandler(ImmersionTrackerFactory factory) { | ||
| this.objectMapper = factory.objectMapper(); | ||
| } | ||
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| @Override | ||
| public AuthorizerResponse handleRequest(AuthorizerEvent event, Context context) { | ||
| try { | ||
| return doHandleRequest(event, context); | ||
| } catch (RuntimeException e) { | ||
| throw e; | ||
| } catch (Exception e) { | ||
| throw new RuntimeException(e); | ||
| } | ||
| } | ||
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| public AuthorizerResponse doHandleRequest(AuthorizerEvent event, Context context) | ||
| throws Exception { | ||
| var token = event.authorizationToken.replace("Bearer ", ""); | ||
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| if (Strings.isNullOrEmpty(token)) { | ||
| throw new RuntimeException("Unauthorized"); | ||
| } | ||
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| if ("jordan".equals(token)) { | ||
| return response(token, IamEffect.ALLOW, event.methodArn()); | ||
| } | ||
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| return response(token, IamEffect.DENY, event.methodArn()); | ||
| } | ||
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| private AuthorizerResponse response(String principal, IamEffect effect, String resource) | ||
| throws JsonProcessingException { | ||
| var policy = | ||
| IamPolicy.builder() | ||
| .version("2012-10-17") | ||
| .addStatement( | ||
| IamStatement.builder() | ||
| .addAction("execute-api:Invoke") | ||
| .effect(effect) | ||
| .addResource(resource) | ||
| .build()) | ||
| .build() | ||
| .toJson(); | ||
| var policyMap = objectMapper.readValue(policy, LinkedHashMap.class); | ||
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| return new AuthorizerResponse(principal, policyMap); | ||
| } | ||
| } |