walnut.js/lib/package-server-static.js

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2016-04-09 23:14:00 +00:00
'use strict';
var staticHandlers = {};
function loadPages(pkgConf, packagedPage, req, res, next) {
var PromiseA = require('bluebird');
var fs = require('fs');
var path = require('path');
var pkgpath = path.join(pkgConf.pagespath, (packagedPage.package || packagedPage.id), (packagedPage.version || ''));
// TODO special cases for /.well_known/ and similar (oauth3.html, oauth3.json, webfinger, etc)
function handlePromise(p) {
p.then(function (app) {
app(req, res, next);
packagedPage._page = app;
}, function (err) {
console.error('[App Promise Error]');
next(err);
});
}
if (staticHandlers[pkgpath]) {
packagedPage._page = staticHandlers[pkgpath];
packagedPage._page(req, res, next);
return;
}
if (!packagedPage._promise_page) {
packagedPage._promise_page = new PromiseA(function (resolve, reject) {
fs.exists(pkgpath, function (exists) {
var staticServer;
if (!exists) {
reject(new Error("package '" + pkgpath + "' is registered but does not exist"));
return;
}
//console.log('[static mount]', pkgpath);
// https://github.com/expressjs/serve-static/issues/54
// https://github.com/pillarjs/send/issues/91
// https://example.com/.well-known/acme-challenge/xxxxxxxxxxxxxxx
staticServer = require('serve-static')(pkgpath, { dotfiles: undefined });
resolve(staticServer);
});
});
}
handlePromise(packagedPage._promise_page);
}
function layerItUp(pkgConf, router, req, res, next) {
var nexti = -1;
// Layers exist so that static apps can use them like a virtual filesystem
// i.e. oauth3.html isn't in *your* app but you may use it and want it mounted at /.well-known/oauth3.html
// or perhaps some dynamic content (like application cache)
function nextify(err) {
var packagedPage;
nexti += 1;
if (err) {
next(err);
return;
}
// shortest to longest
//route = packages.pop();
// longest to shortest
packagedPage = router.packagedPages[nexti];
if (!packagedPage) {
next();
return;
}
if (packagedPage._page) {
packagedPage._page(req, res, nextify);
return;
}
// could attach to req.{ pkgConf, pkgDeps, Services}
loadPages(pkgConf, packagedPage, req, res, next);
}
nextify();
}
module.exports.layerItUp = layerItUp;