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2x | var path = require("path");
var renderToString = require("react-dom/server").renderToString;
var React = require("react");
var StaticRouter = require("react-router-dom").StaticRouter;
var lib = require("./lib");
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) {
res.statusMessage = e.message || e;
res.status(httpCodes.internalServerError);
}
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>" + httpCodes.internalServerError + " 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, template, req, res) {
var initialProps, context = {}; // these vars are passes all the way
return (new Promise(function performRouting(resolve, reject) {
['app'].forEach((k) => {
Iif (!options[k]) throw new Error('Mandatory option not defined: ' + k);
});
var initialHtml = renderToString(React.createElement(
StaticRouter,
{location: req.url, context: context},
options.app({
props: undefined,
req: req,
res: res,
state: undefined
})
));
// console.log('Context', context);
if (context.url) {
res.redirect(httpCodes.redirect, context.url); //TODO Handle context.code
return reject(new Error('Redirect'));
}
resolve(initialHtml);
})).then(function getInitialPropsOfComponent() {
return (new Promise(function(resolve) {
resolve((context.getInitialProps) ? context.getInitialProps({
location: context.location,
req: req,
res: res,
store: context.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', context.store.getState());
return {
html: renderToString(React.createElement(
StaticRouter,
{location: req.url, context: context},
options.app({
props: initialProps,
req: req,
res: res,
state: context.store ? context.store.getState() : undefined
})
))
};
}).catch(function renderErrorHandler(e) {
if (isRedirect(res)) 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) {
setErrorStatus(res, result.error);
} else {
res.status(context.code || httpCodes.ok);
}
res.send(renderHTML(
lib.extends({
error: null,
initialProps: initialProps,
html: '',
req: req,
res: res,
store: context.store,
template: template
}, result), // appends error or html
options
));
}).catch(function finalErrorHandler(e) {
if (isRedirect(res)) return;
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.defaultTemplate = defaultTemplate;
exports.renderHTML = renderHTML;
exports.waitForTemplate = waitForTemplate; |