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# dropwizard-simpleauth
A Dropwizard library that lets you use simple `@Auth` annotations for authenticating multiple
types, without having to deal with `@RolesAllowed` style authorizations.
Install from maven central:
```
<dependency>
<groupId>org.whispersystems</groupId>
<artifactId>dropwizard-simpleauth</artifactId>
<version>${latest_version}</version>
</dependency>
```
## The details
This library allows writing an authenticated Dropwizard resource to look like this:
```
@Path("/api/v1/mail")
public class MailResource {
@Timed
@POST
@Path("/{destination}/")
@Consumes(MediaType.APPLICATION_JSON_TYPE)
public void sendMessage(@Auth User sender,
@PathParam("destination") String destination,
@Valid Message message)
{
...
}
@Timed
@DELETE
@Path("/{messageId}/")
public void sendMessage(@Auth Admin admin,
@PathParam("messageId") long messageId)
{
...
}
}
```
No "authorization" tags like `@AllowAll`, `@DenyAll`, `@RolesAllowed` are used. Instead,
the `@Auth` tag allows you to authenticate multiple different "principal" types (in this example
both `User` and `Admin`), neither of which have to extend `Principal`.
## Registering authenticators
To support authenticating multiple types, register multiple `AuthFilter`s:
`````
@Override
public void run(ExampleConfiguration configuration,
Environment environment)
{
environment.jersey().register(new AuthDynamicFeature(
new BasicCredentialAuthFilter.Builder<User>()
.setAuthenticator(new UserAuthenticator())
.setPrincipal(User.class)
.buildAuthFilter(),
new BasicCredentialAuthFilter.Builder<Admin>()
.setAuthenticator(new AdminAuthenticator())
.setPrincipal(Admin.class)
.buildAuthFilter()));
environment.jersey().register(new AuthValueFactoryProvider.Binder());
}
`````
That's it!

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<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<prerequisites>
<maven>3.0.0</maven>
</prerequisites>
<groupId>org.whispersystems</groupId>
<artifactId>dropwizard-simpleauth</artifactId>
<version>0.1.0</version>
<name>dropwizard-simpleauth</name>
<description>A Dropwizard library for simple @Auth</description>
<url>https://github.com/WhisperSystems/dropwizard-simpleauth</url>
<licenses>
<license>
<name>Apache</name>
<url>http://www.apache.org/licenses/LICENSE-2.0</url>
<distribution>repo</distribution>
</license>
</licenses>
<developers>
<developer>
<name>Moxie Marlinspike</name>
</developer>
</developers>
<scm>
<url>https://github.com/WhisperSystems/dropwizard-simpleauth</url>
<connection>scm:git:https://github.com/WhisperSystems/dropwizard-simpleauth.git</connection>
<developerConnection>scm:git:https://github.com/WhisperSystems/dropwizard-simpleauth.git</developerConnection>
</scm>
<properties>
<dropwizard.version>0.9.0-rc3</dropwizard.version>
</properties>
<dependencies>
<dependency>
<groupId>io.dropwizard</groupId>
<artifactId>dropwizard-auth</artifactId>
<version>${dropwizard.version}</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.mockito</groupId>
<artifactId>mockito-all</artifactId>
<version>1.10.19</version>
<scope>test</scope>
</dependency>
</dependencies>
<distributionManagement>
<snapshotRepository>
<id>ossrh</id>
<url>https://oss.sonatype.org/content/repositories/snapshots</url>
</snapshotRepository>
<repository>
<id>ossrh</id>
<url>https://oss.sonatype.org/service/local/staging/deploy/maven2/</url>
</repository>
</distributionManagement>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>1.7</source>
<target>1.7</target>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-source-plugin</artifactId>
<version>2.2.1</version>
<executions>
<execution>
<id>attach-sources</id>
<goals>
<goal>jar</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-javadoc-plugin</artifactId>
<version>2.9.1</version>
<executions>
<execution>
<id>attach-javadocs</id>
<goals>
<goal>jar</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-gpg-plugin</artifactId>
<version>1.5</version>
<configuration>
<keyname>00B2CAB8</keyname>
</configuration>
<executions>
<execution>
<id>sign-artifacts</id>
<phase>verify</phase>
<goals>
<goal>sign</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<version>2.4</version>
<configuration>
<archive>
<manifest>
<addDefaultImplementationEntries>true</addDefaultImplementationEntries>
</manifest>
</archive>
</configuration>
</plugin>
</plugins>
</build>
</project>

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src/main/java/org/whispersystems/dropwizard/simpleauth/AuthDynamicFeature.java Normal file
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package org.whispersystems.dropwizard.simpleauth;
import org.glassfish.jersey.server.model.AnnotatedMethod;
import javax.ws.rs.container.DynamicFeature;
import javax.ws.rs.container.ResourceInfo;
import javax.ws.rs.core.FeatureContext;
import java.lang.annotation.Annotation;
import io.dropwizard.auth.Auth;
public class AuthDynamicFeature implements DynamicFeature {
private AuthFilter[] authFilters;
public AuthDynamicFeature(AuthFilter... authFilters) {
this.authFilters = authFilters;
}
@Override
public void configure(ResourceInfo resourceInfo, FeatureContext context) {
AnnotatedMethod annotatedMethod = new AnnotatedMethod(resourceInfo.getResourceMethod());
Annotation[][] parameterAnnotations = annotatedMethod.getParameterAnnotations();
Class<?>[] parameterTypes = annotatedMethod.getParameterTypes();
verifyAuthAnnotations(parameterAnnotations);
for (int i=0;i<parameterAnnotations.length;i++) {
for (Annotation annotation : parameterAnnotations[i]) {
if (annotation instanceof Auth) {
context.register(getFilterFor(parameterTypes[i]));
}
}
}
}
private AuthFilter getFilterFor(Class<?> parameterType) {
for (AuthFilter filter : authFilters) {
if (filter.supports(parameterType)) return filter;
}
throw new IllegalArgumentException("No authenticator for type: " + parameterType);
}
private void verifyAuthAnnotations(Annotation[][] parameterAnnotations) {
int authCount = 0;
for (Annotation[] annotations : parameterAnnotations) {
for (Annotation annotation : annotations) {
if (annotation instanceof Auth) authCount++;
}
}
if (authCount > 1) {
throw new IllegalArgumentException("Only one @Auth tag supported per resource method!");
}
}
}

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package org.whispersystems.dropwizard.simpleauth;
import com.google.common.base.Preconditions;
import javax.annotation.Priority;
import javax.ws.rs.Priorities;
import javax.ws.rs.container.ContainerRequestFilter;
import io.dropwizard.auth.DefaultUnauthorizedHandler;
import io.dropwizard.auth.UnauthorizedHandler;
@Priority(Priorities.AUTHENTICATION)
public abstract class AuthFilter<C, P> implements ContainerRequestFilter {
protected String prefix;
protected String realm;
protected Authenticator<C, P> authenticator;
protected Class<P> principalType;
protected UnauthorizedHandler unauthorizedHandler = new DefaultUnauthorizedHandler();
public boolean supports(Class<?> clazz) {
return clazz.equals(principalType);
}
/**
* Abstract builder for auth filters.
*
* @param <C> the type of credentials that the filter accepts
* @param <P> the type of the principal that the filter accepts
*/
public abstract static class AuthFilterBuilder<C, P, T extends AuthFilter<C, P>> {
private String realm = "realm";
private String prefix = "Basic";
private Authenticator<C, P> authenticator;
private Class<P> principalType;
/**
* Sets the given realm
*
* @param realm a realm
* @return the current builder
*/
public AuthFilterBuilder<C, P, T> setRealm(String realm) {
this.realm = realm;
return this;
}
/**
* Sets the given prefix
*
* @param prefix a prefix
* @return the current builder
*/
public AuthFilterBuilder<C, P, T> setPrefix(String prefix) {
this.prefix = prefix;
return this;
}
/**
* Sets the given authenticator
*
* @param authenticator an {@link io.dropwizard.auth.Authenticator}
* @return the current builder
*/
public AuthFilterBuilder<C, P, T> setAuthenticator(Authenticator<C, P> authenticator) {
this.authenticator = authenticator;
return this;
}
public AuthFilterBuilder<C, P, T> setPrincipal(Class<P> principalType) {
this.principalType = principalType;
return this;
}
/**
* Builds an instance of the filter with a provided authenticator,
* an authorizer, a prefix, and a realm.
*
* @return a new instance of the filter
*/
public T buildAuthFilter() {
Preconditions.checkArgument(realm != null, "Realm is not set");
Preconditions.checkArgument(prefix != null, "Prefix is not set");
Preconditions.checkArgument(authenticator != null, "Authenticator is not set");
T authFilter = newInstance();
authFilter.authenticator = authenticator;
authFilter.prefix = prefix;
authFilter.realm = realm;
authFilter.principalType = principalType;
return authFilter;
}
protected abstract T newInstance();
}
}

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src/main/java/org/whispersystems/dropwizard/simpleauth/AuthPrincipal.java Normal file
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package org.whispersystems.dropwizard.simpleauth;
import javax.security.auth.Subject;
import java.security.Principal;
public class AuthPrincipal implements Principal {
private final Object authenticated;
public AuthPrincipal(Object authenticated) {
this.authenticated = authenticated;
}
@Override
public String getName() {
return null;
}
@Override
public boolean implies(Subject subject) {
return false;
}
public Object getAuthenticated() {
return authenticated;
}
}

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src/main/java/org/whispersystems/dropwizard/simpleauth/AuthSecurityContext.java Normal file
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package org.whispersystems.dropwizard.simpleauth;
import javax.ws.rs.core.SecurityContext;
import java.security.Principal;
public class AuthSecurityContext<P> implements SecurityContext {
private final AuthPrincipal principal;
private final boolean secure;
public AuthSecurityContext(P principal, boolean secure) {
this.principal = new AuthPrincipal(principal);
this.secure = secure;
}
@Override
public Principal getUserPrincipal() {
return principal;
}
@Override
public boolean isUserInRole(String role) {
return false;
}
@Override
public boolean isSecure() {
return secure;
}
@Override
public String getAuthenticationScheme() {
return SecurityContext.BASIC_AUTH;
}
}

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package org.whispersystems.dropwizard.simpleauth;
import org.glassfish.hk2.api.InjectionResolver;
import org.glassfish.hk2.api.ServiceLocator;
import org.glassfish.hk2.api.TypeLiteral;
import org.glassfish.hk2.utilities.binding.AbstractBinder;
import org.glassfish.jersey.server.internal.inject.AbstractContainerRequestValueFactory;
import org.glassfish.jersey.server.internal.inject.AbstractValueFactoryProvider;
import org.glassfish.jersey.server.internal.inject.MultivaluedParameterExtractorProvider;
import org.glassfish.jersey.server.internal.inject.ParamInjectionResolver;
import org.glassfish.jersey.server.model.Parameter;
import org.glassfish.jersey.server.spi.internal.ValueFactoryProvider;
import javax.inject.Inject;
import javax.inject.Singleton;
import java.security.Principal;
import io.dropwizard.auth.Auth;
@Singleton
public class AuthValueFactoryProvider extends AbstractValueFactoryProvider {
@Inject
public AuthValueFactoryProvider(MultivaluedParameterExtractorProvider mpep,
ServiceLocator injector)
{
super(mpep, injector, Parameter.Source.UNKNOWN);
}
@Override
public AbstractContainerRequestValueFactory<?> createValueFactory(final Parameter parameter) {
if (parameter.getAnnotation(Auth.class) == null) {
return null;
}
return new AbstractContainerRequestValueFactory() {
/**
* @return {@link Principal} stored on the request, or {@code null} if no object was found.
*/
public Object provide() {
Principal principal = getContainerRequest().getSecurityContext().getUserPrincipal();
if (principal == null) {
throw new IllegalStateException("Cannot inject a custom principal into unauthenticated request");
}
if (!(principal instanceof AuthPrincipal)) {
throw new IllegalArgumentException("Cannot inject a non-AuthPrincipal into request");
}
if (!parameter.getRawType().isAssignableFrom(((AuthPrincipal)principal).getAuthenticated().getClass())) {
throw new IllegalArgumentException("Authenticated principal is of the wrong type!");
}
return parameter.getRawType().cast(((AuthPrincipal) principal).getAuthenticated());
}
};
}
@Singleton
private static class AuthInjectionResolver extends ParamInjectionResolver<Auth> {
/**
* Create new {@link Auth} annotation injection resolver.
*/
public AuthInjectionResolver() {
super(AuthValueFactoryProvider.class);
}
}
/**
* Injection binder for {@link AuthValueFactoryProvider} and {@link AuthInjectionResolver}.
*
*/
public static class Binder extends AbstractBinder {
public Binder() {}
@Override
protected void configure() {
bind(AuthValueFactoryProvider.class).to(ValueFactoryProvider.class).in(Singleton.class);
bind(AuthInjectionResolver.class).to(new TypeLiteral<InjectionResolver<Auth>>() {
}).in(Singleton.class);
}
}
}

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src/main/java/org/whispersystems/dropwizard/simpleauth/Authenticator.java Normal file
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package org.whispersystems.dropwizard.simpleauth;
import com.google.common.base.Optional;
import io.dropwizard.auth.AuthenticationException;
/**
* An interface for classes which authenticate user-provided credentials and return principal
* objects.
*
* @param <C> the type of credentials the authenticator can authenticate
* @param <P> the type of principals the authenticator returns
*/
public interface Authenticator<C, P> {
/**
* Given a set of user-provided credentials, return an optional principal.
*
* If the credentials are valid and map to a principal, returns an {@code Optional.of(p)}.
*
* If the credentials are invalid, returns an {@code Optional.absent()}.
*
* @param credentials a set of user-provided credentials
* @return either an authenticated principal or an absent optional
* @throws AuthenticationException if the credentials cannot be authenticated due to an
* underlying error
*/
Optional<P> authenticate(C credentials) throws AuthenticationException;
}

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src/main/java/org/whispersystems/dropwizard/simpleauth/BasicCredentialAuthFilter.java Normal file
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package org.whispersystems.dropwizard.simpleauth;
import com.google.common.base.Optional;
import com.google.common.io.BaseEncoding;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.annotation.Priority;
import javax.ws.rs.InternalServerErrorException;
import javax.ws.rs.Priorities;
import javax.ws.rs.WebApplicationException;
import javax.ws.rs.container.ContainerRequestContext;
import javax.ws.rs.core.HttpHeaders;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import io.dropwizard.auth.AuthenticationException;
import io.dropwizard.auth.basic.BasicCredentials;
@Priority(Priorities.AUTHENTICATION)
public class BasicCredentialAuthFilter<P> extends AuthFilter<BasicCredentials, P> {
private static final Logger LOGGER = LoggerFactory.getLogger(BasicCredentialAuthFilter.class);
private BasicCredentialAuthFilter() {}
@Override
public void filter(final ContainerRequestContext requestContext) throws IOException {
final String header = requestContext.getHeaders().getFirst(HttpHeaders.AUTHORIZATION);
try {
if (header != null) {
final int space = header.indexOf(' ');
if (space > 0) {
final String method = header.substring(0, space);
if (prefix.equalsIgnoreCase(method)) {
final String decoded = new String(
BaseEncoding.base64().decode(header.substring(space + 1)),
StandardCharsets.UTF_8);
final int i = decoded.indexOf(':');
if (i > 0) {
final String username = decoded.substring(0, i);
final String password = decoded.substring(i + 1);
final BasicCredentials credentials = new BasicCredentials(username, password);
try {
Optional<P> principal = authenticator.authenticate(credentials);
if (principal.isPresent()) {
requestContext.setSecurityContext(new AuthSecurityContext<P>(principal.get(), false));
return;
}
} catch (AuthenticationException e) {
LOGGER.warn("Error authenticating credentials", e);
throw new InternalServerErrorException();
}
}
}
}
}
} catch (IllegalArgumentException e) {
LOGGER.warn("Error decoding credentials", e);
}
throw new WebApplicationException(unauthorizedHandler.buildResponse(prefix, realm));
}
public static class Builder<P> extends AuthFilter.AuthFilterBuilder<BasicCredentials, P, BasicCredentialAuthFilter<P>> {
@Override
protected BasicCredentialAuthFilter<P> newInstance() {
return new BasicCredentialAuthFilter<>();
}
}
}

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package org.whispersystems.dropwizard.simpleauth;
import com.google.common.base.Optional;
import org.junit.Test;
import javax.ws.rs.container.ResourceInfo;
import javax.ws.rs.core.FeatureContext;
import io.dropwizard.auth.Auth;
import io.dropwizard.auth.AuthenticationException;
import io.dropwizard.auth.basic.BasicCredentials;
import static org.mockito.Mockito.*;
public class AuthDynamicFeatureTest {
@Test
public void testPrincipalTypes() throws NoSuchMethodException {
AuthFilter stringPrincipal = new BasicCredentialAuthFilter.Builder<String>().setRealm("Hmm")
.setPrincipal(String.class)
.setAuthenticator(new StringAuthenticator())
.buildAuthFilter();
AuthFilter integerPrincipal = new BasicCredentialAuthFilter.Builder<Integer>().setRealm("Hmm")
.setPrincipal(Integer.class)
.setAuthenticator(new IntegerAuthenticator())
.buildAuthFilter();
AuthDynamicFeature dynamicFeature = new AuthDynamicFeature(stringPrincipal, integerPrincipal);
ResourceInfo resourceInfo = mock(ResourceInfo.class );
FeatureContext featureContext = mock(FeatureContext.class);
when(resourceInfo.getResourceMethod()).thenReturn(MockMethod.class.getDeclaredMethod("stringAuthParam", String.class));
dynamicFeature.configure(resourceInfo, featureContext);
verify(featureContext).register(eq(stringPrincipal));
when(resourceInfo.getResourceMethod()).thenReturn(MockMethod.class.getDeclaredMethod("integerAuthParam", Integer.class));
dynamicFeature.configure(resourceInfo, featureContext);
verify(featureContext).register(eq(integerPrincipal));
}
@Test
public void testMultipleAuthTags() throws NoSuchMethodException {
AuthDynamicFeature dynamicFeature = new AuthDynamicFeature(new AuthFilter[0]);
ResourceInfo resourceInfo = mock(ResourceInfo.class );
FeatureContext featureContext = mock(FeatureContext.class);
when(resourceInfo.getResourceMethod()).thenReturn(MockMethod.class.getDeclaredMethod("multipleAuthParams", String.class, String.class));
try {
dynamicFeature.configure(resourceInfo, featureContext);
throw new AssertionError("Shouldn't support multiple auth tags!");
} catch (Exception e) {
// Good
}
}
private static class MockMethod {
public void multipleAuthParams(@Auth String foo, @Auth String bar) {}
public void stringAuthParam(@Auth String foo) {}
public void integerAuthParam(@Auth Integer bar) {}
}
private static class StringAuthenticator implements Authenticator<BasicCredentials, String> {
@Override
public Optional<String> authenticate(BasicCredentials credentials)
throws AuthenticationException
{
if (credentials.getUsername().equals("user") &&
credentials.getPassword().equals("password"))
return Optional.of("user");
return Optional.absent();
}
}
private static class IntegerAuthenticator implements Authenticator<BasicCredentials, Integer> {
@Override
public Optional<Integer> authenticate(BasicCredentials credentials) throws AuthenticationException {
return Optional.of(1);
}
}
}

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package org.whispersystems.dropwizard.simpleauth;
import com.google.common.base.Optional;
import org.junit.Test;
import org.mockito.ArgumentCaptor;
import javax.ws.rs.WebApplicationException;
import javax.ws.rs.container.ContainerRequestContext;
import javax.ws.rs.core.HttpHeaders;
import javax.ws.rs.core.MultivaluedHashMap;
import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.core.SecurityContext;
import java.io.IOException;
import io.dropwizard.auth.AuthenticationException;
import io.dropwizard.auth.basic.BasicCredentials;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
import static org.mockito.Mockito.*;
public class BasicCredentialAuthFilterTest {
@Test
public void testValidAuth() throws IOException {
AuthFilter authFilter = new BasicCredentialAuthFilter.Builder<String>().setAuthenticator(new StringAuthenticator())
.setPrincipal(String.class)
.setRealm("Hmm")
.buildAuthFilter();
MultivaluedMap<String, String> headers = new MultivaluedHashMap<String, String>() {{
add(HttpHeaders.AUTHORIZATION, "Basic dXNlcjpmb28=");
}};
ContainerRequestContext containerRequestContext = mock(ContainerRequestContext.class);
when(containerRequestContext.getHeaders()).thenReturn(headers);
authFilter.filter(containerRequestContext);
ArgumentCaptor<SecurityContext> captor = ArgumentCaptor.forClass(SecurityContext.class);
verify(containerRequestContext).setSecurityContext(captor.capture());
assertTrue(captor.getValue().getUserPrincipal() instanceof AuthPrincipal);
assertEquals(((AuthPrincipal) captor.getValue().getUserPrincipal()).getAuthenticated(), "user");
}
@Test
public void testInvalidAuth() throws Exception {
AuthFilter authFilter = new BasicCredentialAuthFilter.Builder<String>().setAuthenticator(new StringAuthenticator())
.setPrincipal(String.class)
.setRealm("Hmm")
.buildAuthFilter();
MultivaluedMap<String, String> headers = new MultivaluedHashMap<String, String>() {{
add(HttpHeaders.AUTHORIZATION, "Basic dXNlcjpiYXo=");
}};
ContainerRequestContext containerRequestContext = mock(ContainerRequestContext.class);
when(containerRequestContext.getHeaders()).thenReturn(headers);
try {
authFilter.filter(containerRequestContext);
throw new AssertionError("Shouldn't succeed");
} catch (WebApplicationException wae) {
verify(containerRequestContext, times(0)).setSecurityContext(any(SecurityContext.class));
assertEquals(wae.getResponse().getStatus(), 401);
}
}
private static class StringAuthenticator implements Authenticator<BasicCredentials, String> {
@Override
public Optional<String> authenticate(BasicCredentials credentials) throws AuthenticationException {
if (credentials.getUsername().equals("user") && credentials.getPassword().equals("foo")) {
return Optional.of("user");
}
return Optional.absent();
}
}
}