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package org.jooby;

import java.util.LinkedHashMap;

import java.util.Map;

import java.util.Optional;

import com.typesafe.config.Config;

import org.jooby.funzy.Try;

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

import com.google.common.base.Throwables;

import javax.annotation.Nullable;

/**

* An exception that carry a {@link Status}. The status field will be set in the HTTP

* response.

*

* See {@link Err.Handler} for more details on how to deal with exceptions.

*

* @author edgar

* @since 0.1.0

*/

@SuppressWarnings("serial")

public class Err extends RuntimeException {

/**

* Exception thrown from {@link MediaType#parse(String)} in case of encountering an invalid media

* type specification String.

*

* @author edgar

*/

public static class BadMediaType extends Err {

/**

* Creates a new {@link BadMediaType}.

*

* @param message Error message.

*/

public BadMediaType(final String message) {

super(Status.BAD_REQUEST, message);

}

}

/**

* Missing parameter/header or request attribute.

*

* @author edgar

*/

public static class Missing extends Err {

/**

* Creates a new {@link Missing} error.

*

* @param name Name of the missing parameter/header or request attribute.

*/

public Missing(final String name) {

super(Status.BAD_REQUEST, name);

}

}

/**

* Default err handler it does content negotation.

*

* On <code>text/html</code> requests the err handler creates an <code>err</code> view and use the

* {@link Err#toMap()} result as model.

*

* @author edgar

* @since 0.1.0

*/

public static class DefHandler implements Err.Handler {

/** Default err view. */

public static final String VIEW = "err";

/** logger, logs!. */

private final Logger log = LoggerFactory.getLogger(Err.class);

@Override

public void handle(final Request req, final Response rsp, final Err ex) throws Throwable {

log.error("execution of: {}{} resulted in exception\nRoute:\n{}\n\nStacktrace:",

req.method(), req.path(), req.route().print(6), ex);

Config conf = req.require(Config.class);

boolean stackstrace = Try.apply(() -> conf.getBoolean("err.stacktrace"))

.orElse(req.require(Env.class).name().equals("dev"));

rsp.send(

Results

.when(MediaType.html, () -> Results.html(VIEW).put("err", ex.toMap(stackstrace)))

.when(MediaType.all, () -> ex.toMap(stackstrace)));

}

}

/**

* Handle and render exceptions. Error handlers are executed in the order they were provided, the

* first err handler that send an output wins!

*

* The default err handler does content negotation on error, see {@link DefHandler}.

*

* @author edgar

* @since 0.1.0

*/

public interface Handler {

/**

* Handle a route exception by properly logging the error and sending a err response to the

* client.

*

* Please note you always get an {@link Err} whenever you throw it or not. For example if your

* application throws an {@link IllegalArgumentException} exception you will get an {@link Err}

* and you can retrieve the original exception by calling {@link Err#getCause()}.

*

* Jooby always give you an {@link Err} with an optional root cause and an associated status

* code.

*

* @param req HTTP request.

* @param rsp HTTP response.

* @param ex Error found and status code.

* @throws Throwable If something goes wrong.

*/

void handle(Request req, Response rsp, Err ex) throws Throwable;

}

/**

* The status code. Required.

*/

private int status;

/**

* Creates a new {@link Err}.

*

* @param status A HTTP status. Required.

* @param message A error message. Required.

* @param cause The cause of the problem.

*/

public Err(final Status status, final String message, final Throwable cause) {

super(message(status, message), cause);

this.status = status.value();

}

/**

* Creates a new {@link Err}.

*

* @param status A HTTP status. Required.

* @param message A error message. Required.

* @param cause The cause of the problem.

*/

public Err(final int status, final String message, final Throwable cause) {

super(message("", status, message), cause);

this.status = status;

}

/**

* Creates a new {@link Err}.

*

* @param status A web socket close status. Required.

* @param message Close message.

*/

public Err(final WebSocket.CloseStatus status, final String message) {

super(message(status.reason(), status.code(), message));

this.status = status.code();

}

/**

* Creates a new {@link Err}.

*

* @param status A HTTP status. Required.

* @param message A error message. Required.

*/

public Err(final Status status, final String message) {

super(message(status, message));

this.status = status.value();

}

/**

* Creates a new {@link Err}.

*

* @param status A HTTP status. Required.

* @param message A error message. Required.

*/

public Err(final int status, final String message) {

this(Status.valueOf(status), message);

}

/**

* Creates a new {@link Err}.

*

* @param status A HTTP status. Required.

* @param cause The cause of the problem.

*/

public Err(final Status status, final Throwable cause) {

super(message(status, null), cause);

this.status = status.value();

}

/**

* Creates a new {@link Err}.

*

* @param status A HTTP status. Required.

* @param cause The cause of the problem.

*/

public Err(final int status, final Throwable cause) {

this(Status.valueOf(status), cause);

}

/**

* Creates a new {@link Err}.

*

* @param status A HTTP status. Required.

*/

public Err(final Status status) {

super(message(status, null));

this.status = status.value();

}

/**

* Creates a new {@link Err}.

*

* @param status A HTTP status. Required.

*/

public Err(final int status) {

this(Status.valueOf(status));

}

/**

* @return The status code to send as response.

*/

public int statusCode() {

return status;

}

/**

* Produces a friendly view of the err, resulting map has these attributes:

*

* <pre>

* message: exception message (if present)

* status: status code

* reason: a status code reason

* </pre>

*

* @return A lightweight view of the err.

*/

public Map<String, Object> toMap() {

return toMap(false);

}

/**

* Produces a friendly view of the err, resulting map has these attributes:

*

* <pre>

* message: exception message (if present)

* stacktrace: array with the stacktrace

* status: status code

* reason: a status code reason

* </pre>

*

* @param stacktrace True for adding stacktrace.

* @return A lightweight view of the err.

*/

public Map<String, Object> toMap(boolean stacktrace) {

Status status = Status.valueOf(this.status);

Throwable cause = Optional.ofNullable(getCause()).orElse(this);

String message = Optional.ofNullable(cause.getMessage()).orElse(status.reason());

Map<String, Object> err = new LinkedHashMap<>();

err.put("message", message);

if (stacktrace) {

err.put("stacktrace", Throwables.getStackTraceAsString(cause).replace("\r", "").split("\\n"));

}

err.put("status", status.value());

err.put("reason", status.reason());

return err;

}

/**

* Build an error message using the HTTP status.

*

* @param status The HTTP Status.

* @param tail A message to append.

* @return An error message.

*/

private static String message(final Status status, @Nullable final String tail) {

return message(status.reason(), status.value(), tail);

}

/**

* Build an error message using the HTTP status.

*

* @param reason Reason.

* @param status The Status.

* @param tail A message to append.

* @return An error message.

*/

private static String message(final String reason, final int status, @Nullable final String tail) {

return reason + "(" + status + ")" + (tail == null ? "" : ": " + tail);

}

}