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JCL-349: Better concurrency support for OpenID session refresh by acoburn · Pull Request #456 · inrupt/solid-client-java · GitHub

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JCL-349: Better concurrency support for OpenID session refresh #456

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Merged
acoburn merged 1 commit into from
May 16, 2023
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JCL-349: Better concurrency support for OpenID session refresh #456

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37 changes: 28 additions & 9 deletions openid/src/main/java/com/inrupt/client/openid/OpenIdSession.java
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Original file line number Diff line number Diff line change
Expand Up @@ -40,6 +40,8 @@
import java.util.UUID;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.CompletionStage;
import java.util.concurrent.ForkJoinPool;
import java.util.concurrent.ForkJoinTask;
import java.util.concurrent.atomic.AtomicReference;
import java.util.function.Supplier;

Expand All @@ -54,19 +56,24 @@
import org.jose4j.jwt.consumer.JwtConsumerBuilder;
import org.jose4j.keys.resolvers.HttpsJwksVerificationKeyResolver;
import org.jose4j.keys.resolvers.VerificationKeyResolver;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
* A session implementation for use with OpenID Connect ID Tokens.
*
*/
public final class OpenIdSession implements Session {

private static final Logger LOGGER = LoggerFactory.getLogger(OpenIdSession.class);

public static final URI ID_TOKEN = URI.create("http://openid.net/specs/openid-connect-core-1_0.html#IDToken");

private final String id;
private final Set<String> schemes;
private final Supplier<CompletionStage<Credential>> authenticator;
private final AtomicReference<Credential> credential = new AtomicReference<>();
private final ForkJoinPool executor = new ForkJoinPool(1);
private final DPoP dpop;

private OpenIdSession(final String id, final DPoP dpop,
Expand Down Expand Up @@ -182,15 +189,11 @@ public Set<String> supportedSchemes() {
@Override
public Optional<Credential> getCredential(final URI name, final URI uri) {
if (ID_TOKEN.equals(name)) {
final Credential c = credential.get();
if (!hasExpired(c)) {
return Optional.of(c);
}
final Credential freshCredential = authenticator.get().toCompletableFuture().join();
if (!hasExpired(freshCredential)) {
credential.set(freshCredential);
return Optional.of(freshCredential);
final Credential cred = credential.get();
if (!hasExpired(cred)) {
return Optional.of(cred);
}
return Optional.ofNullable(executor.invoke(ForkJoinTask.adapt(this::synchronizedFetch)));
}
return Optional.empty();
}
Expand Down Expand Up @@ -222,7 +225,7 @@ public Optional<Credential> fromCache(final Request request) {
@Override
public CompletionStage<Optional<Credential>> authenticate(final Request request,
final Set<String> algorithms) {
return authenticator.get().thenApply(Optional::ofNullable);
return CompletableFuture.completedFuture(getCredential(ID_TOKEN, null));
}

boolean hasExpired(final Credential credential) {
Expand All @@ -232,6 +235,22 @@ boolean hasExpired(final Credential credential) {
return true;
}

private synchronized Credential synchronizedFetch() {
// Check again inside the synchronized method
final Credential cred = credential.get();
if (!hasExpired(cred)) {
return cred;
}

// Fetch the refreshed credentials
final Credential refreshed = authenticator.get().toCompletableFuture().join();
if (!hasExpired(refreshed)) {
credential.set(refreshed);
return refreshed;
}
return null;
}

static String getSessionIdentifier(final JwtClaims claims) {
final String webid = claims.getClaimValueAsString("webid");
if (webid != null) {
Expand Down
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