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package org.jooby.handlers;
import static java.util.Objects.requireNonNull;
import java.util.Collections;
import java.util.List;
import java.util.Optional;
import org.jooby.Request;
import org.jooby.Response;
import org.jooby.Route;
import org.jooby.Route.Chain;
import org.jooby.Status;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.google.common.base.Joiner;
import com.google.common.base.Splitter;
/**
* Handle preflight and simple CORS requests. CORS options are set via: {@link Cors}.
*
* @author edgar
* @since 0.8.0
* @see Cors
*/
public class CorsHandler implements Route.Filter {
private static final String ORIGIN = "Origin";
private static final String ANY_ORIGIN = "*";
private static final String AC_REQUEST_METHOD = "Access-Control-Request-Method";
private static final String AC_REQUEST_HEADERS = "Access-Control-Request-Headers";
private static final String AC_MAX_AGE = "Access-Control-Max-Age";
private static final String AC_EXPOSE_HEADERS = "Access-Control-Expose-Headers";
private static final String AC_ALLOW_ORIGIN = "Access-Control-Allow-Origin";
private static final String AC_ALLOW_HEADERS = "Access-Control-Allow-Headers";
private static final String AC_ALLOW_CREDENTIALS = "Access-Control-Allow-Credentials";
private static final String AC_ALLOW_METHODS = "Access-Control-Allow-Methods";
/** The logging system. */
private final Logger log = LoggerFactory.getLogger(Cors.class);
private Optional cors = Optional.empty();
/**
* Creates a new {@link CorsHandler}.
*
* @param cors Cors options, or empty for using default options.
*/
public CorsHandler(final Cors cors) {
this.cors = Optional.of(requireNonNull(cors, "Cors is required."));
}
/**
* Creates a new {@link CorsHandler}.
*/
public CorsHandler() {
}
@Override
public void handle(final Request req, final Response rsp, final Chain chain) throws Throwable {
Optional origin = req.header("Origin").toOptional();
Cors cors = this.cors.orElseGet(() -> req.require(Cors.class));
if (cors.enabled() && origin.isPresent()) {
cors(cors, req, rsp, origin.get());
}
chain.next(req, rsp);
}
private void cors(final Cors cors, final Request req, final Response rsp,
final String origin) throws Exception {
if (cors.allowOrigin(origin)) {
log.debug("allowed origin: {}", origin);
if (preflight(req)) {
log.debug("handling preflight for: {}", origin);
preflight(cors, req, rsp, origin);
} else {
log.debug("handling simple cors for: {}", origin);
if ("null".equals(origin)) {
rsp.header(AC_ALLOW_ORIGIN, ANY_ORIGIN);
} else {
rsp.header(AC_ALLOW_ORIGIN, origin);
if (!cors.anyOrigin()) {
rsp.header("Vary", ORIGIN);
}
if (cors.credentials()) {
rsp.header(AC_ALLOW_CREDENTIALS, true);
}
if (!cors.exposedHeaders().isEmpty()) {
rsp.header(AC_EXPOSE_HEADERS, join(cors.exposedHeaders()));
}
}
}
}
}
private boolean preflight(final Request req) {
return req.method().equals("OPTIONS") && req.header(AC_REQUEST_METHOD).isSet();
}
private void preflight(final Cors cors, final Request req, final Response rsp,
final String origin) {
/**
* Allowed method
*/
boolean allowMethod = req.header(AC_REQUEST_METHOD).toOptional()
.map(cors::allowMethod)
.orElse(false);
if (!allowMethod) {
return;
}
/**
* Allowed headers
*/
List headers = req.header(AC_REQUEST_HEADERS).toOptional().map(header ->
Splitter.on(',').trimResults().omitEmptyStrings().splitToList(header)
).orElse(Collections.emptyList());
if (!cors.allowHeaders(headers)) {
return;
}
/**
* Allowed methods
*/
rsp.header(AC_ALLOW_METHODS, join(cors.allowedMethods()));
List allowedHeaders = cors.anyHeader() ? headers : cors.allowedHeaders();
rsp.header(AC_ALLOW_HEADERS, join(allowedHeaders));
/**
* Allow credentials
*/
if (cors.credentials()) {
rsp.header(AC_ALLOW_CREDENTIALS, true);
}
if (cors.maxAge() > 0) {
rsp.header(AC_MAX_AGE, cors.maxAge());
}
rsp.header(AC_ALLOW_ORIGIN, origin);
if (!cors.anyOrigin()) {
rsp.header("Vary", ORIGIN);
}
rsp.status(Status.OK).end();
}
private String join(final List values) {
return Joiner.on(',').join(values);
}
}
