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package org.jooby;
import static java.util.Objects.requireNonNull;
import java.util.Map;
import java.util.Optional;
import java.util.function.Function;
import org.jooby.internal.handlers.FlashScopeHandler;
import org.jooby.mvc.Flash;
import com.google.inject.Binder;
import com.typesafe.config.Config;
/**
* flash scope
*
* The flash scope is designed to transport success and error messages, between requests. The flash
* scope is similar to {@link Session} but lifecycle is shorter: data are kept for only one request.
*
*
* The flash scope is implemented as client side cookie, so it helps to keep application stateless.
*
*
* usage
*
* {@code
* {
* use(new FlashScope());
*
* get("/", req -> {
* return req.ifFlash("success").orElse("Welcome!");
* });
*
* post("/", req -> {
* req.flash("success", "The item has been created");
* return Results.redirect("/");
* });
* }
* }
*
* {@link FlashScope} is also available on mvc routes via {@link Flash} annotation:
*
* {@code
* @Path("/")
* public class Controller {
*
* @GET
* public Object flashScope(@Flash Map<String, String> flash) {
* ...
* }
*
* @GET
* public Object flashAttr(@Flash String foo) {
* ...
* }
*
* @GET
* public Object optionlFlashAttr(@Flash Optional<String> foo) {
* ...
* }
* }
* }
*
*
* Worth to mention that flash attributes are accessible from template engine by prefixing
* attributes with flash.. Here is a handlebars.java example:
*
*
* {@code
* {{#if flash.success}}
* {{flash.success}}
* {{else}}
* Welcome!
* {{/if}}
* }
*
* @author edgar
* @since 1.0.0.CR4
*/
public class FlashScope implements Jooby.Module {
public static final String NAME = "flash";
private Function> decoder = Cookie.URL_DECODER;
private Function, String> encoder = Cookie.URL_ENCODER;
private Optional cookie = Optional.empty();
private String method = "*";
private String path = "*";
/**
* Creates a new {@link FlashScope} and customize the flash cookie.
*
* @param cookie Cookie template for flash scope.
*/
public FlashScope(final Cookie.Definition cookie) {
this.cookie = Optional.of(requireNonNull(cookie, "Cookie required."));
}
/**
* Creates a new {@link FlashScope}.
*/
public FlashScope() {
}
@Override
public void configure(final Env env, final Config conf, final Binder binder) {
Config $cookie = conf.getConfig("flash.cookie");
String cpath = $cookie.getString("path");
boolean chttp = $cookie.getBoolean("httpOnly");
boolean csecure = $cookie.getBoolean("secure");
Cookie.Definition cookie = this.cookie
.orElseGet(() -> new Cookie.Definition($cookie.getString("name")));
// uses user provided or fallback to defaults
cookie.path(cookie.path().orElse(cpath))
.httpOnly(cookie.httpOnly().orElse(chttp))
.secure(cookie.secure().orElse(csecure));
env.router()
.use(method, path, new FlashScopeHandler(cookie, decoder, encoder))
.name("flash-scope");
}
}