98 lines
3.6 KiB
JavaScript
98 lines
3.6 KiB
JavaScript
/*
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* Copyright (C) 2015 - present Instructure, Inc.
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*
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* This file is part of Canvas.
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*
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* Canvas is free software: you can redistribute it and/or modify it under
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* the terms of the GNU Affero General Public License as published by the Free
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* Software Foundation, version 3 of the License.
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*
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* Canvas is distributed in the hope that it will be useful, but WITHOUT ANY
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* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
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* A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
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* details.
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*
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* You should have received a copy of the GNU Affero General Public License along
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* with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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// this is how we do the magic for making sure extensions in plugins get applied
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// to canvas modules. It depends upon conventional file system names (
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// some file in the plugin has the same name as the coffeescript file it extends
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// in canvas)
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/*
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# given app/coffeescripts/foo.coffee in canvas-lms, if you want to
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# monkey patch it from your plugin, create
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# app/coffeescripts/extensions/foo.coffee (in your plugin) like so:
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#
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# define ->
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# (Foo) ->
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# Foo::zomg = -> "i added this method"
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# Foo
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#
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# and that's it, no changes required in canvas-lms, no plugin
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# bundles, etc.
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#
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# note that Foo is not an explicit dependency, it magically figures
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# it out. also note that your module should return a function that
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# accepts and returns Foo. this function will magically wrap around
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# Foo so you can do stuff to it anytime somebody requires "foo" as
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# per usual.
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*/
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const glob = require('glob')
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// this is all the extensions that we can find in gems/plugins
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const extensions = (() => {
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const pluginExtensionsPattern = `${__dirname}/../gems/plugins/*/app/coffeescripts/extensions/**/*.coffee`
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const pluginExtensions = glob.sync(pluginExtensionsPattern, [])
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const extensionsMap = {}
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const extensionPartsRegexp = /plugins\/([^/]*)\/app\/coffeescripts\/extensions\/(.*)\.coffee/
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pluginExtensions.forEach((extension) => {
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const extractions = extension.match(extensionPartsRegexp)
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const pluginName = extractions[1]
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const fileName = extractions[2]
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if (extensionsMap[fileName] === undefined) {
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extensionsMap[fileName] = []
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}
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extensionsMap[fileName].push(pluginName)
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})
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return extensionsMap
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})()
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const unextendedRegexp = /^unextended!/
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const extensionRequirementRegexp = /\/extensions\//
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class BundleExtensionsPlugin {
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apply (compiler) {
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compiler.plugin('normal-module-factory', (nmf) => {
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nmf.plugin('before-resolve', (result, callback) => {
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let addLoadersFor = []
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// if we're resolving an extension, we don't want to try to
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// extend the extension itself, so skip the check and move on
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if (!extensionRequirementRegexp.test(result.request)) {
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Object.keys(extensions).forEach((key) => {
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if (result.request.includes(key)) {
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if (unextendedRegexp.test(result.request)) {
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// skip, unextended loader means we really want the original
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} else {
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// we're trying to resolve a file that has an extension in at least one plugin,
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// so we'll set the flag that tells us to add the withExtensions loader
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// down below
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addLoadersFor = extensions[key]
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}
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}
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})
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if (addLoadersFor.length > 0) {
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const newRequest = `withExtensions?${addLoadersFor.join(',')}!${result.request}`
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result.request = newRequest
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}
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}
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return callback(null, result)
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})
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})
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}
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}
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module.exports = BundleExtensionsPlugin
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