server/protocols/jmap/src/main/java/org/apache/james/jmap/JMAPRoutes.java

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package org.apache.james.jmap;

import static io.netty.handler.codec.http.HttpResponseStatus.BAD_REQUEST;
import static io.netty.handler.codec.http.HttpResponseStatus.INTERNAL_SERVER_ERROR;
import static io.netty.handler.codec.http.HttpResponseStatus.PERMANENT_REDIRECT;
import static io.netty.handler.codec.http.HttpResponseStatus.UNAUTHORIZED;

import java.util.stream.Stream;

import org.slf4j.Logger;

import reactor.core.publisher.Mono;
import reactor.netty.http.server.HttpServerResponse;

public interface JMAPRoutes {
    Stream<JMAPRoute> routes();

    JMAPRoute.Action CORS_CONTROL = corsHeaders((req, res) -> res.send());

    static JMAPRoute.Action corsHeaders(JMAPRoute.Action action) {
        return (req, res) -> action.handleRequest(req, res
            .header("Access-Control-Allow-Origin", "*")
            .header("Access-Control-Allow-Methods", "GET, POST, DELETE, PUT")
            .header("Access-Control-Allow-Headers", "Content-Type, Authorization, Accept"));
    }

    static JMAPRoute.Action redirectTo(String location) {
        return (req, res) -> res.status(PERMANENT_REDIRECT).header("Location", location).send();
    }

    default Mono<Void> handleInternalError(HttpServerResponse response, Logger logger, Throwable e) {
        logger.error("Internal server error", e);
        return response.status(INTERNAL_SERVER_ERROR).send();
    }

    default Mono<Void> handleBadRequest(HttpServerResponse response, Logger logger, Throwable e) {
        logger.warn("Invalid request received.", e);
        return response.status(BAD_REQUEST).send();
    }

    default Mono<Void> handleAuthenticationFailure(HttpServerResponse response, Logger logger, Throwable e) {
        logger.warn("Unauthorized", e);
        return response.status(UNAUTHORIZED).send();
    }
}