"use strict";
const bent = require("bent");
const getJSON = bent("json");
const { encode } = require("html-entities");
const cleanBaseURL = require("clean-base-url");
const path = require("path");
const fs = require("fs");
// via https://stackoverflow.com/a/6248722/165668
function generateUID() {
let firstPart = (Math.random() * 46656) | 0; // eslint-disable-line no-bitwise
let secondPart = (Math.random() * 46656) | 0; // eslint-disable-line no-bitwise
firstPart = ("000" + firstPart.toString(36)).slice(-3);
secondPart = ("000" + secondPart.toString(36)).slice(-3);
return firstPart + secondPart;
}
const IGNORE_PATHS = [
/\/ember-cli-live-reload\.js$/,
/\/session\/[^\/]+\/become$/,
];
function htmlTag(buffer, bootstrap) {
let classList = "";
if (bootstrap.html_classes) {
classList = ` class="${bootstrap.html_classes}"`;
}
buffer.push(``);
}
function head(buffer, bootstrap) {
if (bootstrap.csrf_token) {
buffer.push(``);
buffer.push(``);
}
if (bootstrap.theme_id) {
buffer.push(
``
);
}
if (bootstrap.theme_color) {
buffer.push(``);
}
let setupData = "";
Object.keys(bootstrap.setup_data).forEach((sd) => {
let val = bootstrap.setup_data[sd];
if (val) {
if (Array.isArray(val)) {
val = JSON.stringify(val);
} else {
val = val.toString();
}
setupData += ` data-${sd.replace(/\_/g, "-")}="${encode(val)}"`;
}
});
buffer.push(``);
(bootstrap.stylesheets || []).forEach((s) => {
let attrs = [];
if (s.media) {
attrs.push(`media="${s.media}"`);
}
if (s.target) {
attrs.push(`data-target="${s.target}"`);
}
if (s.theme_id) {
attrs.push(`data-theme-id="${s.theme_id}"`);
}
if (s.class) {
attrs.push(`class="${s.class}"`);
}
let link = ``;
buffer.push(link);
});
bootstrap.plugin_js.forEach((src) =>
buffer.push(``)
);
buffer.push(bootstrap.theme_html.translations);
buffer.push(bootstrap.theme_html.js);
buffer.push(bootstrap.theme_html.head_tag);
buffer.push(bootstrap.html.before_head_close);
}
function localeScript(buffer, bootstrap) {
buffer.push(``);
}
function beforeScriptLoad(buffer, bootstrap) {
buffer.push(bootstrap.html.before_script_load);
localeScript(buffer, bootstrap);
(bootstrap.extra_locales || []).forEach((l) =>
buffer.push(``)
);
}
function body(buffer, bootstrap) {
buffer.push(bootstrap.theme_html.header);
buffer.push(bootstrap.html.header);
}
function bodyFooter(buffer, bootstrap, headers) {
buffer.push(bootstrap.theme_html.body_tag);
buffer.push(bootstrap.html.before_body_close);
let v = generateUID();
buffer.push(`
`);
}
function hiddenLoginForm(buffer, bootstrap) {
if (!bootstrap.preloaded.currentUser) {
buffer.push(`
`);
}
}
function preloaded(buffer, bootstrap) {
buffer.push(
``
);
}
const BUILDERS = {
"html-tag": htmlTag,
"before-script-load": beforeScriptLoad,
head,
body,
"hidden-login-form": hiddenLoginForm,
preloaded,
"body-footer": bodyFooter,
"locale-script": localeScript,
};
function replaceIn(bootstrap, template, id, headers) {
let buffer = [];
BUILDERS[id](buffer, bootstrap, headers);
let contents = buffer.filter((b) => b && b.length > 0).join("\n");
return template.replace(``, contents);
}
async function applyBootstrap(bootstrap, template, response) {
// If our initial page added some preload data let's not lose that.
let json = await response.json();
if (json && json.preloaded) {
bootstrap.preloaded = Object.assign(json.preloaded, bootstrap.preloaded);
}
Object.keys(BUILDERS).forEach((id) => {
template = replaceIn(bootstrap, template, id, response);
});
return template;
}
function buildFromBootstrap(assetPath, proxy, baseURL, req, response) {
// eslint-disable-next-line
return new Promise((resolve, reject) => {
fs.readFile(
path.join(process.cwd(), "dist", assetPath),
"utf8",
(err, template) => {
let url = `${proxy}${baseURL}bootstrap.json`;
let queryLoc = req.url.indexOf("?");
if (queryLoc !== -1) {
url += req.url.substr(queryLoc);
}
getJSON(url, null, req.headers)
.then((json) => {
return applyBootstrap(json.bootstrap, template, response);
})
.then(resolve)
.catch((e) => {
reject(
`Could not get ${proxy}${baseURL}bootstrap.json\n\n${e.toString()}`
);
});
}
);
});
}
async function handleRequest(assetPath, proxy, baseURL, req, res) {
if (assetPath.endsWith("tests/index.html")) {
return;
}
if (assetPath.endsWith("index.html")) {
try {
// Avoid Ember CLI's proxy if doing a GET, since Discourse depends on some non-XHR
// GET requests to work.
if (req.method === "GET") {
let url = `${proxy}${req.path}`;
let queryLoc = req.url.indexOf("?");
if (queryLoc !== -1) {
url += req.url.substr(queryLoc);
}
req.headers["X-Discourse-Ember-CLI"] = "true";
let get = bent("GET", [200, 301, 302, 303, 307, 308, 404, 403, 500]);
let response = await get(url, null, req.headers);
res.set(response.headers);
res.set("content-type", "text/html");
if (response.headers["x-discourse-bootstrap-required"] === "true") {
req.headers["X-Discourse-Asset-Path"] = req.path;
let html = await buildFromBootstrap(
assetPath,
proxy,
baseURL,
req,
response
);
return res.send(html);
}
res.status(response.status);
res.send(await response.text());
}
} catch (e) {
res.send(`
Discourse Build Error
${e.toString()}
`);
}
}
}
module.exports = {
name: require("./package").name,
isDevelopingAddon() {
return true;
},
serverMiddleware(config) {
let proxy = config.options.proxy;
let app = config.app;
let options = config.options;
if (!proxy) {
// eslint-disable-next-line
console.error(`
Discourse can't be run without a \`--proxy\` setting, because it needs a Rails application
to serve API requests. For example:
yarn run ember serve --proxy "http://localhost:3000"\n`);
throw "--proxy argument is required";
}
let watcher = options.watcher;
let baseURL =
options.rootURL === ""
? "/"
: cleanBaseURL(options.rootURL || options.baseURL);
app.use(async (req, res, next) => {
try {
const results = await watcher;
if (this.shouldHandleRequest(req, options)) {
let assetPath = req.path.slice(baseURL.length);
let isFile = false;
try {
isFile = fs
.statSync(path.join(results.directory, assetPath))
.isFile();
} catch (err) {}
if (!isFile) {
assetPath = "index.html";
}
await handleRequest(assetPath, proxy, baseURL, req, res);
}
} finally {
if (!res.headersSent) {
return next();
}
}
});
},
shouldHandleRequest(req) {
let acceptHeaders = req.headers.accept || [];
let hasHTMLHeader = acceptHeaders.indexOf("text/html") !== -1;
if (req.method !== "GET") {
return false;
}
if (!hasHTMLHeader) {
return false;
}
if (IGNORE_PATHS.some((ip) => ip.test(req.path))) {
return false;
}
if (req.path.endsWith(".json")) {
return false;
}
let baseURLRegexp = new RegExp(`^/`);
return baseURLRegexp.test(req.path);
},
};