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2x | var path = require("path");
var Provider = require("react-redux").Provider;
var WrapperProvider = require("./wrapper").WrapperProvider;
var renderToString = require("react-dom/server").renderToString;
var React = require("react");
var ReactRouter = require("react-router");
var lib = require("./lib");
var match = ReactRouter.match;
var RouterContext = ReactRouter.RouterContext;
var roots = [
'/',
'/index.html'
];
var httpCodes = {
redirect: 301,
ok: 200,
notFound: 404,
internalServerError: 500,
notImplemented: 501
};
var pollInterval = 200;
function isRedirect(res) {
return res.statusCode === httpCodes.redirect;
}
function setErrorStatus(res, e) {
e.code = e.code || httpCodes.internalServerError;
res.statusMessage = e.message || e;
res.status(e.code);
return e;
}
function waitForTemplate(options) {
return (new Promise(function(resolve) {
var interval = setInterval(function() {
Eif (options.fs.existsSync(options.templatePath)) {
clearInterval(interval);
resolve(options.fs.readFileSync(options.templatePath).toString());
}
}, pollInterval);
}));
}
function renderHTML(config, options) {
var parsedTemplate = options.template({
component: config.component,
error: config.error,
html: config.html,
initialProps: config.initialProps,
store: config.store,
renderProps: config.renderProps,
req: config.req,
res: config.res,
template: config.template.replace(
'<head>', // this should be the first script on a page so that others can pick it up
'<head>' +
'<script type="text/javascript">window["' + options.initialStateKey + '"] = ' + JSON.stringify(config.store ? config.store.getState() : undefined) + ';</script>' +
'<script type="text/javascript">window["' + options.initialPropsKey + '"] = ' + JSON.stringify(config.initialProps) + ';</script>'
)
});
if (typeof parsedTemplate !== 'string') throw new Error('Return type of options.template() has to be a string');
return parsedTemplate;
}
function errorTemplate(config) {
return (
"<h1>" + config.error.code + " Server Error</h1>" +
"<pre>" + (config.error.stack || config.error) + "</pre>"
);
}
function defaultTemplate(config) {
var error = config.error ? ('<div id="server-error">' + errorTemplate(config) + '</div>') : '';
return config.template.replace(
'<div id="root"></div>',
error + '<div id="root">' + config.html + '</div>'
);
}
function middleware(options, routes, history, template, req, res, next) {
var Cmp, renderProps, store, initialProps; // these vars are passes all the way
return (new Promise(function performRouting(resolve, reject) {
['createRoutes'].forEach((k) => {
Iif (!options[k]) throw new Error('Mandatory option not defined: ' + k);
});
options.initialStateKey = options.initialStateKey || '__INITIAL__STATE__';
options.initialPropsKey = options.initialPropsKey || '__INITIAL__PROPS__';
options.createStore = options.createStore || null;
options.outputPath = options.outputPath || path.join(process.cwd(), 'build');
options.templatePath = options.templatePath || path.join(options.outputPath, 'index.html');
options.template = options.template || defaultTemplate;
var location = history.createLocation(req.url);
Iif (
options.fs.existsSync(path.join(options.outputPath, location.pathname)) &&
!~roots.indexOf(location.pathname)
) {
if (options.debug) console.log('Static', location.pathname);
next();
var e = new Error('Static');
e.static = true;
return reject(e);
}
match({routes: routes, location: location}, function(error, redirectLocation, props) {
renderProps = props;
var e;
Iif (options.debug) console.log('Rendering', location.pathname + location.search);
if (redirectLocation) {
res.redirect(httpCodes.redirect, redirectLocation.pathname + redirectLocation.search);
e = new Error('Redirect');
e.code = httpCodes.redirect;
return reject(e);
}
// TODO Find how to test
Iif (error) {
error.code = httpCodes.notImplemented;
return reject(error);
}
// This is hard 404 which means router failed to load any page
if (!renderProps) {
e = new Error('Route Not Found');
e.code = httpCodes.notFound;
return reject(e);
}
resolve();
});
})).then(function getInitialPropsOfComponent() {
store = options.createStore ? options.createStore({req: req, res: res}) : null;
Cmp = renderProps.components[renderProps.components.length - 1]; // it used to be .WrappedComponent but it's useless, users can find it themselves if needed
// console.log('Found Component', Cmp.getInitialProps);
return new Promise(function(resolve) {
resolve((Cmp && Cmp.getInitialProps) ? Cmp.getInitialProps({
location: renderProps.location,
params: renderProps.params,
req: req,
res: res,
store: store
}) : null);
}).catch(function(e) {
return {initialError: e.message || e.toString()};
});
}).then(function renderApp(props) {
initialProps = props || {}; // client relies on truthy value of server-rendered props
// console.log('Setting context initial props', initialProps);
// console.log('Store state before rendering', store.getState());
var routerContext = React.createElement(RouterContext, renderProps);
return {
html: renderToString(
React.createElement(
WrapperProvider,
{initialProps: initialProps},
(store
? React.createElement(Provider, {store: store}, routerContext)
: routerContext)
)
)
};
}).catch(function renderErrorHandler(e) {
if (isRedirect(res) || e.static) throw e;
// If we end up here it means server-side error that can't be handled by application
// By returning an object we are recovering from error
return {
error: e
};
}).then(function renderAndSendHtml(result) {
if (result.error) {
result.error = setErrorStatus(res, result.error);
} else {
res.status(Cmp && !Cmp.notFound ? httpCodes.ok : httpCodes.notFound);
}
res.send(renderHTML(
lib.extends({
component: Cmp,
error: null,
initialProps: initialProps,
html: '',
renderProps: renderProps,
req: req,
res: res,
store: store,
template: template
}, result), // appends error or html
options
));
}).catch(function finalErrorHandler(e) {
if (isRedirect(res) || e.static) return;
e = setErrorStatus(res, e);
res.send(errorTemplate({
error: e,
req: req,
res: res,
template: template
}));
return e; // re-throw to make it unhandled?
});
}
exports.middleware = middleware;
exports.errorTemplate = errorTemplate;
exports.renderHTML = renderHTML;
exports.waitForTemplate = waitForTemplate; |