111 lines
3.5 KiB
JavaScript
111 lines
3.5 KiB
JavaScript
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var path = require('path'),
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_ = require('lodash'),
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Promise = require('bluebird'),
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AppProxy = require('./proxy'),
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config = require('../config'),
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AppSandbox = require('./sandbox'),
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AppDependencies = require('./dependencies'),
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AppPermissions = require('./permissions'),
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loader;
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// Get the full path to an app by name
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function getAppAbsolutePath(name) {
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return path.join(config.paths.appPath, name);
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}
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// Get a relative path to the given apps root, defaults
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// to be relative to __dirname
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function getAppRelativePath(name, relativeTo) {
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relativeTo = relativeTo || __dirname;
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return path.relative(relativeTo, getAppAbsolutePath(name));
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}
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// Load apps through a pseudo sandbox
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function loadApp(appPath) {
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var sandbox = new AppSandbox();
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return sandbox.loadApp(appPath);
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}
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function getAppByName(name, permissions) {
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// Grab the app class to instantiate
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var AppClass = loadApp(getAppRelativePath(name)),
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appProxy = new AppProxy({
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name: name,
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permissions: permissions
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}),
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app;
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// Check for an actual class, otherwise just use whatever was returned
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if (_.isFunction(AppClass)) {
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app = new AppClass(appProxy);
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} else {
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app = AppClass;
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}
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return {
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app: app,
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proxy: appProxy
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};
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}
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// The loader is responsible for loading apps
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loader = {
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// Load a app and return the instantiated app
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installAppByName: function (name) {
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// Install the apps dependencies first
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var appPath = getAppAbsolutePath(name),
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deps = new AppDependencies(appPath);
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return deps.install()
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.then(function () {
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// Load app permissions
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var perms = new AppPermissions(appPath);
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return perms.read().catch(function (err) {
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// Provide a helpful error about which app
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return Promise.reject(new Error('Error loading app named ' + name + '; problem reading permissions: ' + err.message));
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});
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})
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.then(function (appPerms) {
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var appInfo = getAppByName(name, appPerms),
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app = appInfo.app,
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appProxy = appInfo.proxy;
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// Check for an install() method on the app.
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if (!_.isFunction(app.install)) {
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return Promise.reject(new Error('Error loading app named ' + name + '; no install() method defined.'));
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}
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// Run the app.install() method
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// Wrapping the install() with a when because it's possible
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// to not return a promise from it.
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return Promise.resolve(app.install(appProxy)).return(app);
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});
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},
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// Activate a app and return it
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activateAppByName: function (name) {
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var perms = new AppPermissions(getAppAbsolutePath(name));
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return perms.read().then(function (appPerms) {
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var appInfo = getAppByName(name, appPerms),
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app = appInfo.app,
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appProxy = appInfo.proxy;
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// Check for an activate() method on the app.
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if (!_.isFunction(app.activate)) {
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return Promise.reject(new Error('Error loading app named ' + name + '; no activate() method defined.'));
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}
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// Wrapping the activate() with a when because it's possible
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// to not return a promise from it.
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return Promise.resolve(app.activate(appProxy)).return(app);
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});
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}
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};
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module.exports = loader;
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