exhibit-plugin-serve
Version:
No-op transform that serves your filemap over HTTP as a side-effect.
258 lines (190 loc) • 27.6 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", {
value: true
});
var _koa = require('koa');
var _koa2 = _interopRequireDefault(_koa);
var _http = require('http');
var _http2 = _interopRequireDefault(_http);
var _path = require('path');
var _path2 = _interopRequireDefault(_path);
var _portscannerPlus = require('portscanner-plus');
var _lodash = require('lodash');
var _bluebird = require('bluebird');
var _bluebird2 = _interopRequireDefault(_bluebird);
var _socket = require('socket.io');
var _socket2 = _interopRequireDefault(_socket);
var _exhibit = require('exhibit');
var _exhibitDirectory = require('exhibit-directory');
var _exhibitDirectory2 = _interopRequireDefault(_exhibitDirectory);
var _immutable = require('immutable');
var _injectSnippet = require('./injectSnippet');
var _injectSnippet2 = _interopRequireDefault(_injectSnippet);
var _parseRedirects = require('./parseRedirects');
var _parseRedirects2 = _interopRequireDefault(_parseRedirects);
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
const RELOAD_URL = '/__reload-client.js';
const defaults = {
webRoot: '.',
reload: false,
redirects: true,
log: true
};
exports.default = (...args) => {
let options;
if ((0, _lodash.isString)(args[0])) {
options = Object.assign({}, defaults, args[1]);
options.webRoot = args[0];
} else {
options = Object.assign({}, defaults, args[0]);
}
let files = (0, _exhibit.normalize)({});
let _ready;
let io;
let redirects = [];
let numRedirects = 0;
const redirectsManifestName = _path2.default.normalize(_path2.default.join(options.webRoot, '_redirects'));
const reload = async names => {
io.emit('reload', names.map(name => _path2.default.relative(options.webRoot, name)));
};
// one-time promise factory. the returned promise fulfills when the web server is listening
const ready = () => {
if (!_ready) {
_ready = (async () => {
const app = new _koa2.default();
const snippet = `<script src="${RELOAD_URL}"></script>`;
// precompile the clientside reload script
const reloadScript = options.reload ? await (async () => {
// TODO make a way for plugins to register their own custom extra build tasks, so we can prebuild the client script as part of the main monorepo build process, and get rid of this step.
// until then, this just adds a couple of unnecessary deps and a second or two delay to starting up.
const clientPath = _path2.default.join(__dirname, 'client');
const clientDir = new _exhibitDirectory2.default(clientPath, { force: true });
const clientBuilt = await (0, _exhibit.compose)((0, _exhibit.plugin)('babel', {
root: clientPath
}), (0, _exhibit.plugin)('browserify', {
root: clientPath
}))((await clientDir.read()));
return clientBuilt.get('client.entry.js');
})() : '';
// write the middleware
app.use(async ctx => {
/* eslint-disable no-param-reassign */
// only handle GET and HEAD requests
if (ctx.method !== 'HEAD' && ctx.method !== 'GET') return;
// quickly return the reload script if appropriate
if (options.reload && ctx.path === RELOAD_URL) {
ctx.type = 'js';
if (ctx.method !== 'HEAD') ctx.body = reloadScript;
return;
}
// make an OS-native version of the path (replace slashes with this OS's path delimiter)
const normalPath = ctx.path.substring(1).replace(/\//g, _path2.default.sep);
// work out which file they've actually requested
let requestedFile = _path2.default.normalize(_path2.default.join(options.webRoot, normalPath));
// handle netlify-style 'redirects' (i.e. custom routes)
let rewritten = false;
if (options.redirects) {
for (let i = 0; i < numRedirects; i += 1) {
const { redirect, code } = redirects[i];
const targetPath = redirect(`/${normalPath}`);
if (targetPath) {
switch (code) {
// redirection
case 301:
case 302:
ctx.status = code;
ctx.redirect(`${ctx.protocol}://${ctx.host}${targetPath}`);
return;
// passthrough
case 200:
case 404:
ctx.status = code;
requestedFile = _path2.default.normalize(_path2.default.join(options.webRoot, targetPath));
rewritten = true;
break;
default:
throw new Error(`Unexpected HTTP status: ${redirect.status}`);
}
break;
}
}
}
// add "/index" if it's the root request
if (!rewritten && normalPath === '') requestedFile = _path2.default.join(requestedFile, 'index');
// ...or to any request that ends with a slash
else if (requestedFile.endsWith('/')) requestedFile += 'index';
let type = _path2.default.extname(requestedFile).replace(/^\./, '') || 'html';
let contents = files.get(requestedFile);
// if (!type || !type.length) type = 'html';
if (!contents) {
contents = files.get(`${requestedFile}.html`);
type = 'html';
}
if (options.reload && type === 'html' && contents) {
// console.log('injecting snippet');
contents = (0, _injectSnippet2.default)(String(contents), snippet);
} // else console.log('NOT injecting snippet', type, options.reload, contents);
if (contents) {
if (ctx.method !== 'HEAD') ctx.body = contents;
ctx.type = type;
return;
}
// try redirecting with a slash, if there's an index.html
if (normalPath.length && !normalPath.endsWith('/') && files.get(_path2.default.join(requestedFile, 'index.html'))) {
console.log(`exhibit-plugin-serve: redirecting "${ctx.path}" -> "${ctx.path}/"`);
ctx.status = 301;
ctx.redirect(`${ctx.protocol}://${ctx.host}${ctx.path}/`);
return;
}
// can't find anything to resolve this request, it's a 404
ctx.status = 404;
if (ctx.method !== 'HEAD') {
ctx.body = [`<h1>404 Not Found: ${requestedFile}</h1>`, '<p>Available paths:</p>', '<ul>', ...[...files.keys()].slice(0, 100)
// .filter(name =>
// subdir(servePath, path.resolve(dir._absolutePath, name))
// )
.map(name => {
// const pathname = `/${path.relative(
// servePath, path.resolve(dir._absolutePath, name)
// )}`;
const pathname = name;
return `<li><a href="${pathname}">${pathname}</a></li>`;
}), '</ul>'].join('');
if (options.reload) {
ctx.body = (0, _injectSnippet2.default)(ctx.body, snippet);
}
}
/* eslint-enable no-param-reassign */
});
const [serverPort] = await (0, _portscannerPlus.getPorts)(1, 8000, 9000);
const server = _http2.default.createServer(app.callback());
await _bluebird2.default.promisify(server.listen.bind(server))(serverPort);
if (options.reload) io = new _socket2.default(server);
if (options.onReady) {
options.onReady({ port: serverPort });
}
if (options.log) {
console.log(`exhibit-plugin-serve: serving at http://localhost:${serverPort}/`);
}
})();
}
return _ready;
};
return async _files => {
const changedNames = _immutable.Set.fromKeys((0, _exhibit.diff)(files, _files));
// (re)parse the redirects if they've changed
if (options.redirects && changedNames.has(redirectsManifestName)) {
const config = _files.get(redirectsManifestName);
redirects = config ? (0, _parseRedirects2.default)(String(config)) : [];
numRedirects = redirects.length;
}
// expose new filemap to the server
files = _files;
await ready();
if (options.reload && changedNames.size) {
await reload(changedNames);
}
return _files;
};
};
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@flow\n\nimport Koa from 'koa';\nimport http from 'http';\nimport path from 'path';\nimport { getPorts } from 'portscanner-plus';\nimport { isString } from 'lodash';\nimport Bluebird from 'bluebird';\nimport SocketIO from 'socket.io';\nimport { compose, diff, normalize, plugin } from 'exhibit';\nimport Directory from 'exhibit-directory';\nimport { Set as ImmutableSet } from 'immutable';\nimport injectSnippet from './injectSnippet';\nimport parseRedirects from './parseRedirects';\n\nimport type { Transform } from '../../types';\nimport type { Redirection } from './types';\n\nconst RELOAD_URL = '/__reload-client.js';\n\nconst defaults = {\n  webRoot: '.',\n  reload: false,\n  redirects: true,\n  log: true,\n};\n\nexport default (...args: any[]): Transform => {\n  let options;\n\n  if (isString(args[0])) {\n    options = Object.assign({}, defaults, args[1]);\n    options.webRoot = args[0];\n  } else {\n    options = Object.assign({}, defaults, args[0]);\n  }\n\n  let files = normalize({});\n  let _ready;\n  let io;\n  let redirects: Array<Redirection> = [];\n  let numRedirects = 0;\n  const redirectsManifestName = path.normalize(path.join(options.webRoot, '_redirects'));\n\n  const reload = async (names) => {\n    io.emit('reload', names.map(name => path.relative(options.webRoot, name)));\n  };\n\n  // one-time promise factory. the returned promise fulfills when the web server is listening\n  const ready = () => {\n    if (!_ready) {\n      _ready = (async () => {\n        const app = new Koa();\n\n        const snippet = `<script src=\"${RELOAD_URL}\"></script>`;\n\n        // precompile the clientside reload script\n        const reloadScript = options.reload ? await (async () => {\n          // TODO make a way for plugins to register their own custom extra build tasks, so we can prebuild the client script as part of the main monorepo build process, and get rid of this step.\n          // until then, this just adds a couple of unnecessary deps and a second or two delay to starting up.\n          const clientPath = path.join(__dirname, 'client');\n          const clientDir = new Directory(clientPath, { force: true });\n          const clientBuilt = await compose(\n            plugin('babel', {\n              root: clientPath,\n            }),\n            plugin('browserify', {\n              root: clientPath,\n            }),\n          )(await clientDir.read());\n\n          return clientBuilt.get('client.entry.js');\n        })() : '';\n\n        // write the middleware\n        app.use(async (ctx) => {\n          /* eslint-disable no-param-reassign */\n\n          // only handle GET and HEAD requests\n          if (ctx.method !== 'HEAD' && ctx.method !== 'GET') return;\n\n          // quickly return the reload script if appropriate\n          if (options.reload && ctx.path === RELOAD_URL) {\n            ctx.type = 'js';\n            if (ctx.method !== 'HEAD') ctx.body = reloadScript;\n            return;\n          }\n\n          // make an OS-native version of the path (replace slashes with this OS's path delimiter)\n          const normalPath = ctx.path.substring(1).replace(/\\//g, path.sep);\n\n          // work out which file they've actually requested\n          let requestedFile = path.normalize(path.join(\n            options.webRoot,\n            normalPath,\n          ));\n\n          // handle netlify-style 'redirects' (i.e. custom routes)\n          let rewritten = false;\n          if (options.redirects) {\n            for (let i = 0; i < numRedirects; i += 1) {\n              const { redirect, code } = redirects[i];\n\n              const targetPath = redirect(`/${normalPath}`);\n\n              if (targetPath) {\n                switch (code) {\n                  // redirection\n                  case 301:\n                  case 302:\n                    ctx.status = code;\n                    ctx.redirect(`${ctx.protocol}://${ctx.host}${targetPath}`);\n                    return;\n\n                  // passthrough\n                  case 200:\n                  case 404:\n                    ctx.status = code;\n                    requestedFile = path.normalize(path.join(\n                      options.webRoot,\n                      targetPath,\n                    ));\n                    rewritten = true;\n                    break;\n\n                  default:\n                    throw new Error(`Unexpected HTTP status: ${redirect.status}`);\n                }\n\n                break;\n              }\n            }\n          }\n\n          // add \"/index\" if it's the root request\n          if (!rewritten && normalPath === '') requestedFile = path.join(requestedFile, 'index');\n          // ...or to any request that ends with a slash\n          else if (requestedFile.endsWith('/')) requestedFile += 'index';\n\n          let type = path.extname(requestedFile).replace(/^\\./, '') || 'html';\n          let contents = files.get(requestedFile);\n\n          // if (!type || !type.length) type = 'html';\n\n          if (!contents) {\n            contents = files.get(`${requestedFile}.html`);\n            type = 'html';\n          }\n\n          if (options.reload && type === 'html' && contents) {\n            // console.log('injecting snippet');\n            contents = injectSnippet(String(contents), snippet);\n          } // else console.log('NOT injecting snippet', type, options.reload, contents);\n\n          if (contents) {\n            if (ctx.method !== 'HEAD') ctx.body = contents;\n            ctx.type = type;\n            return;\n          }\n\n          // try redirecting with a slash, if there's an index.html\n          if (normalPath.length && !normalPath.endsWith('/') && files.get(path.join(requestedFile, 'index.html'))) {\n            console.log(`exhibit-plugin-serve: redirecting \"${ctx.path}\" -> \"${ctx.path}/\"`);\n            ctx.status = 301;\n            ctx.redirect(`${ctx.protocol}://${ctx.host}${ctx.path}/`);\n            return;\n          }\n\n          // can't find anything to resolve this request, it's a 404\n          ctx.status = 404;\n\n          if (ctx.method !== 'HEAD') {\n            ctx.body = [\n              `<h1>404 Not Found: ${requestedFile}</h1>`,\n              '<p>Available paths:</p>',\n              '<ul>',\n              ...(\n                [...files.keys()]\n                  .slice(0, 100)\n                  // .filter(name =>\n                  //   subdir(servePath, path.resolve(dir._absolutePath, name))\n                  // )\n                  .map((name) => {\n                    // const pathname = `/${path.relative(\n                    //   servePath, path.resolve(dir._absolutePath, name)\n                    // )}`;\n                    const pathname = name;\n\n                    return `<li><a href=\"${pathname}\">${pathname}</a></li>`;\n                  })\n              ),\n              '</ul>',\n            ].join('');\n\n            if (options.reload) {\n              ctx.body = injectSnippet(ctx.body, snippet);\n            }\n          }\n\n          /* eslint-enable no-param-reassign */\n        });\n\n        const [serverPort] = await getPorts(1, 8000, 9000);\n\n        const server = http.createServer(app.callback());\n\n        await Bluebird.promisify(server.listen.bind(server))(serverPort);\n\n        if (options.reload) io = new SocketIO(server);\n\n        if (options.onReady) {\n          options.onReady({ port: serverPort });\n        }\n\n        if (options.log) {\n          console.log(`exhibit-plugin-serve: serving at http://localhost:${serverPort}/`);\n        }\n      })();\n    }\n\n    return _ready;\n  };\n\n  return async (_files) => {\n    const changedNames = ImmutableSet.fromKeys(diff(files, _files));\n\n    // (re)parse the redirects if they've changed\n    if (options.redirects && changedNames.has(redirectsManifestName)) {\n      const config = _files.get(redirectsManifestName);\n      redirects = config ? parseRedirects(String(config)) : [];\n      numRedirects = redirects.length;\n    }\n\n    // expose new filemap to the server\n    files = _files;\n\n    await ready();\n\n    if (options.reload && changedNames.size) {\n      await reload(changedNames);\n    }\n\n    return _files;\n  };\n};\n"]}