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podlet.js
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podlet.js
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/* eslint-disable consistent-return */
/* eslint-disable no-underscore-dangle */
/* eslint-disable no-restricted-syntax */
'use strict';
const { CssDeprecation, JsDeprecation } = require('./deprecations');
const { HttpIncoming, pathnameBuilder, AssetCss, AssetJs } = require('@podium/utils');
const { validate } = require('@podium/schemas');
const Metrics = require('@metrics/client');
const abslog = require('abslog');
const objobj = require('objobj');
const utils = require('@podium/utils');
const Proxy = require('@podium/proxy');
const pkg = require('../package.json');
const { template } = utils;
const _compabillity = Symbol('_compabillity');
const _sanitize = Symbol('_sanitize');
const _addCssAsset = Symbol('_addCssAsset');
const _addJsAsset = Symbol('_addJsAsset');
const PodiumPodlet = class PodiumPodlet {
constructor({
name = '',
version = '',
pathname = '',
manifest = '/manifest.json',
fallback = '',
content = '/',
logger = undefined,
development = false,
} = {}) {
if (validate.name(name).error)
throw new Error(
`The value, "${name}", for the required argument "name" on the Podlet constructor is not defined or not valid.`,
);
if (validate.version(version).error)
throw new Error(
`The value, "${version}", for the required argument "version" on the Podlet constructor is not defined or not valid.`,
);
if (validate.uri(pathname).error)
throw new Error(
`The value, "${pathname}", for the required argument "pathname" on the Podlet constructor is not defined or not valid.`,
);
if (validate.uri(manifest).error)
throw new Error(
`The value, "${manifest}", for the optional argument "manifest" on the Podlet constructor is not valid.`,
);
if (validate.content(content).error)
throw new Error(
`The value, "${content}", for the optional argument "content" on the Podlet constructor is not valid.`,
);
if (validate.fallback(fallback).error)
throw new Error(
`The value, "${fallback}", for the optional argument "fallback" on the Podlet constructor is not valid.`,
);
Object.defineProperty(this, 'name', {
value: name,
});
Object.defineProperty(this, 'version', {
value: version,
});
Object.defineProperty(this, '_pathname', {
value: this[_sanitize](pathname),
});
Object.defineProperty(this, 'manifestRoute', {
value: this[_sanitize](manifest),
});
Object.defineProperty(this, 'contentRoute', {
value: this[_sanitize](content),
});
Object.defineProperty(this, 'fallbackRoute', {
value: this[_sanitize](fallback),
});
Object.defineProperty(this, 'cssRoute', {
value: [],
});
Object.defineProperty(this, 'jsRoute', {
value: [],
});
Object.defineProperty(this, 'proxyRoutes', {
value: {},
});
Object.defineProperty(this, 'log', {
value: abslog(logger),
});
Object.defineProperty(this, 'development', {
value: development,
});
Object.defineProperty(this, 'httpProxy', {
enumerable: true,
value: new Proxy({
pathname: this._pathname,
logger: this.log,
}),
});
Object.defineProperty(this, 'baseContext', {
value: {
debug: 'false',
locale: 'en-US',
deviceType: 'desktop',
requestedBy: this.name,
mountOrigin: '',
mountPathname: this._pathname,
publicPathname: pathnameBuilder(
this.httpProxy.pathname,
this.httpProxy.prefix,
this.name,
),
},
writable: false,
});
Object.defineProperty(this, 'defaultContext', {
value: {},
writable: true,
});
Object.defineProperty(this, 'metrics', {
enumerable: true,
value: new Metrics(),
});
Object.defineProperty(this, '_view', {
value: template,
writable: true,
});
// Skip a tick to ensure the metric stream has been consumed
setImmediate(() => {
const moduleVersion = pkg.version;
const segments = moduleVersion.split('.').map(value => {
return parseInt(value, 10);
});
const versionGauge = this.metrics.gauge({
name: 'podium_podlet_version_info',
description: '@podium/podlet version info',
labels: {
version: moduleVersion,
major: segments[0],
minor: segments[1],
patch: segments[2],
},
});
versionGauge.set(1);
});
this.metrics.on('error', error => {
this.log.error(
'Error emitted by metric stream in @podium/podlet module',
error,
);
});
}
get [Symbol.toStringTag]() {
return 'PodiumPodlet';
}
pathname() {
return this._pathname;
}
manifest({ prefix = false } = {}) {
return this[_sanitize](this.manifestRoute, prefix);
}
content({ prefix = false } = {}) {
return this[_sanitize](this.contentRoute, prefix);
}
fallback({ prefix = false } = {}) {
return this[_sanitize](this.fallbackRoute, prefix);
}
[_addCssAsset](options = {}) {
if (!options.value) {
const v = this[_compabillity](this.cssRoute);
return this[_sanitize](v, options.prefix);
}
const args = Object.assign({}, options, {pathname: this._pathname});
this.cssRoute.push(new AssetCss(args));
// deprecate
return new CssDeprecation(this[_sanitize](args.value, args.prefix));
}
css(options = {}) {
if (Array.isArray(options)) {
for (const opts of options) {
this[_addCssAsset](opts);
}
return;
}
return this[_addCssAsset](options);
}
[_addJsAsset](options = {}) {
if (!options.value) {
const v = this[_compabillity](this.jsRoute);
return this[_sanitize](v, options.prefix);
}
const args = Object.assign({}, options, {pathname: this._pathname});
this.jsRoute.push(new AssetJs(args));
// deprecate
return new JsDeprecation(this[_sanitize](args.value, args.prefix));
}
js(options = {}) {
if (Array.isArray(options)) {
for (const opts of options) {
this[_addJsAsset](opts);
}
return;
}
return this[_addJsAsset](options);
}
proxy({ target = null, name = null } = {}) {
if (validate.uri(target).error)
throw new Error(
`Value on argument variable "target", "${target}", is not valid`,
);
if (validate.name(name).error)
throw new Error(
`Value on argument variable "name", "${name}", is not valid`,
);
if (Object.keys(this.proxyRoutes).length >= 4) {
throw new Error(
`One can not define more than 4 proxy targets for each podlet`,
);
}
this.proxyRoutes[name] = target;
if (this.development) {
this.httpProxy.register(this);
}
return target;
}
defaults(context = null) {
if (context) {
this.defaultContext = context;
}
return Object.assign({}, this.baseContext, this.defaultContext);
}
view(fn = null) {
if (!utils.isFunction(fn)) {
throw new Error(
`Value on argument variable "template" must be a function`,
);
}
this._view = fn;
}
toJSON() {
return {
name: this.name,
version: this.version,
content: this.contentRoute,
fallback: this.fallbackRoute,
assets: {
js: this[_compabillity](this.jsRoute),
css: this[_compabillity](this.cssRoute),
},
css: this.cssRoute,
js: this.jsRoute,
proxy: this.proxyRoutes,
};
}
render(incoming, data, ...args) {
if (!incoming.development) {
return data;
}
return this._view(incoming, data, ...args);
}
async process(incoming, { proxy = true } = {}) {
incoming.name = this.name;
incoming.css = this.cssRoute;
incoming.js = this.jsRoute;
// Determine if request comes from layout server or not
if (
incoming.request.headers['user-agent'] &&
incoming.request.headers['user-agent'].startsWith('@podium/client')
) {
incoming.development = false;
} else {
incoming.development = this.development;
}
// Append development context
if (incoming.development) {
incoming.context = Object.assign(
this.baseContext,
{ mountOrigin: incoming.url.origin },
this.defaultContext,
);
this.log.debug(
`Appending a default context to inbound request "${JSON.stringify(
incoming.context,
)}"`,
);
} else {
incoming.context = utils.deserializeContext(
incoming.request.headers,
);
this.log.debug(
`Inbound request contains a context "${JSON.stringify(
incoming.context,
)}"`,
);
}
// Determin if the request should be proxied and do if so
if (incoming.development && proxy) {
await this.httpProxy.process(incoming);
}
return incoming;
}
middleware() {
return async (req, res, next) => {
const incoming = new HttpIncoming(req, res);
try {
await this.process(incoming);
// if this is a proxy request then no further work should be done.
if (incoming.proxy) return;
// set "incoming" on res.locals.podium
objobj.set('locals.podium', incoming, res);
if (res.header) {
res.header('podlet-version', this.version);
}
res.podiumSend = (data, ...args) =>
res.send(this.render(incoming, data, ...args));
next();
} catch (error) {
next(error);
}
};
}
[_sanitize](uri, prefix = false) {
const pathname = prefix ? this._pathname : '';
if (uri) {
return utils.uriIsRelative(uri)
? utils.pathnameBuilder(pathname, uri)
: uri;
}
return uri;
}
// This is here only to cater for compabillity between version 3 and 4
// Can be removed when deprecation of the .assets terminated
[_compabillity](arr) {
const result = arr.map(obj => {
const o = obj.toJSON();
return o.value;
});
return result.length === 0 ? '' : result[0];
}
};
module.exports = PodiumPodlet;