io.dropwizard.auth.PolymorphicAuthValueFactoryProvider Maven / Gradle / Ivy

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package io.dropwizard.auth;

import org.checkerframework.checker.nullness.qual.Nullable;
import org.glassfish.jersey.internal.inject.AbstractBinder;
import org.glassfish.jersey.server.ContainerRequest;
import org.glassfish.jersey.server.internal.inject.AbstractValueParamProvider;
import org.glassfish.jersey.server.internal.inject.MultivaluedParameterExtractorProvider;
import org.glassfish.jersey.server.model.Parameter;
import org.glassfish.jersey.server.spi.internal.ValueParamProvider;

import javax.inject.Inject;
import javax.inject.Singleton;
import java.lang.reflect.ParameterizedType;
import java.security.Principal;
import java.util.Optional;
import java.util.Set;
import java.util.function.Function;

/**
 * Value factory provider supporting injection of a hierarchy of
 * {@link Principal} subclasses by the {@link Auth} annotation.
 *
 * @param  the type acting as the superclass from which injected
 *            principals inherit
 */
@Singleton
public class PolymorphicAuthValueFactoryProvider extends AbstractValueParamProvider {
    /**
     * Set of provided {@link Principal} subclasses.
     */
    protected final Set> principalClassSet;


    /**
     * {@link Principal} value factory provider injection constructor.
     *
     * @param mpep                      multivalued parameter extractor provider
     * @param principalClassSetProvider provider(s) of the principal class
     */
    @Inject
    public PolymorphicAuthValueFactoryProvider(
        MultivaluedParameterExtractorProvider mpep,
        PrincipalClassSetProvider principalClassSetProvider
    ) {
        super(() -> mpep, org.glassfish.jersey.model.Parameter.Source.UNKNOWN);
        this.principalClassSet = principalClassSetProvider.clazzSet;
    }

    @Nullable
    @Override
    protected Function createValueProvider(Parameter parameter) {
        if (!parameter.isAnnotationPresent(Auth.class)) {
            return null;
        } else if (principalClassSet.contains(parameter.getRawType())) {
            return request -> new PrincipalContainerRequestValueFactory(request).provide();
        } else {
            final boolean isOptionalPrincipal = parameter.getRawType() == Optional.class
                && ParameterizedType.class.isAssignableFrom(parameter.getType().getClass())
                && principalClassSet.contains(((ParameterizedType) parameter.getType()).getActualTypeArguments()[0]);

            return isOptionalPrincipal ? request -> new OptionalPrincipalContainerRequestValueFactory(request).provide() : null;
        }
    }

    @Singleton
    protected static class PrincipalClassSetProvider {

        private final Set> clazzSet;

        public PrincipalClassSetProvider(Set> clazzSet) {
            this.clazzSet = clazzSet;
        }
    }

    /**
     * Injection binder for {@link PolymorphicAuthValueFactoryProvider}.
     *
     * @param  the type of the principal
     */
    public static class Binder extends AbstractBinder {

        private final Set> principalClassSet;

        public Binder(Set> principalClassSet) {
            this.principalClassSet = principalClassSet;
        }

        @Override
        protected void configure() {
            bind(new PrincipalClassSetProvider<>(principalClassSet)).to(PrincipalClassSetProvider.class);
            bind(PolymorphicAuthValueFactoryProvider.class).to(ValueParamProvider.class).in(Singleton.class);
        }
    }
}