/
ServletBearerAuthenticationFilter.java
83 lines (70 loc) · 3.26 KB
/
ServletBearerAuthenticationFilter.java
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package sample;
import io.github.vpavic.bearerauth.AuthorizationContext;
import io.github.vpavic.bearerauth.BearerAuthenticationHandler;
import io.github.vpavic.bearerauth.BearerToken;
import io.github.vpavic.bearerauth.BearerTokenException;
import io.github.vpavic.bearerauth.HttpExchange;
import io.github.vpavic.bearerauth.MapAuthorizationContextResolver;
import io.github.vpavic.bearerauth.WwwAuthenticateBuilder;
import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.time.Instant;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.ExecutionException;
@WebFilter(urlPatterns = "/resource")
public class ServletBearerAuthenticationFilter extends HttpFilter {
private final BearerAuthenticationHandler bearerAuthenticationHandler;
public ServletBearerAuthenticationFilter() {
Map<BearerToken, AuthorizationContext> authorizationContexts = new HashMap<>();
authorizationContexts.put(new BearerToken("valid"),
new AuthorizationContext(Collections.emptySet(), Instant.MAX, Collections.emptyMap()));
authorizationContexts.put(new BearerToken("expired"),
new AuthorizationContext(Collections.emptySet(), Instant.MIN, Collections.emptyMap()));
this.bearerAuthenticationHandler = BearerAuthenticationHandler.builder(
new MapAuthorizationContextResolver(authorizationContexts)).build();
}
@Override
protected void doFilter(HttpServletRequest request, HttpServletResponse response, FilterChain chain)
throws IOException, ServletException {
try {
this.bearerAuthenticationHandler.handle(new ServletHttpExchange(request)).toCompletableFuture().get();
chain.doFilter(request, response);
}
catch (ExecutionException ex) {
Throwable cause = ex.getCause();
if (cause instanceof BearerTokenException) {
BearerTokenException bearerTokenException = (BearerTokenException) cause;
String wwwAuthenticate = WwwAuthenticateBuilder.from(bearerTokenException).build();
response.addHeader("WWW-Authenticate", wwwAuthenticate);
response.sendError(bearerTokenException.getStatus());
}
else {
throw new ServletException(ex);
}
}
catch (InterruptedException ex) {
throw new ServletException(ex);
}
}
private static class ServletHttpExchange implements HttpExchange {
private final HttpServletRequest httpServletRequest;
private ServletHttpExchange(HttpServletRequest httpServletRequest) {
this.httpServletRequest = httpServletRequest;
}
@Override
public String getRequestHeader(String headerName) {
return this.httpServletRequest.getHeader(headerName);
}
@Override
public void setAttribute(String attributeName, Object attributeValue) {
httpServletRequest.setAttribute(attributeName, attributeValue);
}
}
}