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node-loaders.js
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node-loaders.js
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/* eslint-disable no-console */
'use strict';
const fs = require('fs');
const path = require('path');
const Loader = require('./loader');
const {PrecompiledLoader} = require('./precompiled-loader.js');
let chokidar;
try {
chokidar = require('chokidar'); // eslint-disable-line global-require
} catch (e) {} // eslint-disable-line no-empty
class FileSystemLoader extends Loader {
constructor(searchPaths, opts) {
super();
if (typeof opts === 'boolean') {
console.log(
'[nunjucks] Warning: you passed a boolean as the second ' +
'argument to FileSystemLoader, but it now takes an options ' +
'object. See http://mozilla.github.io/nunjucks/api.html#filesystemloader'
);
}
opts = opts || {};
this.pathsToNames = {};
this.noCache = !!opts.noCache;
if (searchPaths) {
searchPaths = Array.isArray(searchPaths) ? searchPaths : [searchPaths];
// For windows, convert to forward slashes
this.searchPaths = searchPaths.map(path.normalize);
} else {
this.searchPaths = ['.'];
}
if (opts.watch) {
// Watch all the templates in the paths and fire an event when
// they change
if (!chokidar) {
throw new Error('watch requires chokidar to be installed');
}
const paths = this.searchPaths.filter(fs.existsSync);
const watcher = chokidar.watch(paths);
watcher.on('all', (event, fullname) => {
fullname = path.resolve(fullname);
if (event === 'change' && fullname in this.pathsToNames) {
this.emit('update', this.pathsToNames[fullname], fullname);
}
});
watcher.on('error', (error) => {
console.log('Watcher error: ' + error);
});
}
}
getSource(name) {
var fullpath = null;
var paths = this.searchPaths;
for (let i = 0; i < paths.length; i++) {
const basePath = path.resolve(paths[i]);
const p = path.resolve(paths[i], name);
// Only allow the current directory and anything
// underneath it to be searched
if (p.indexOf(basePath) === 0 && fs.existsSync(p)) {
fullpath = p;
break;
}
}
if (!fullpath) {
return null;
}
this.pathsToNames[fullpath] = name;
const source = {
src: fs.readFileSync(fullpath, 'utf-8'),
path: fullpath,
noCache: this.noCache
};
this.emit('load', name, source);
return source;
}
}
class NodeResolveLoader extends Loader {
constructor(opts) {
super();
opts = opts || {};
this.pathsToNames = {};
this.noCache = !!opts.noCache;
if (opts.watch) {
if (!chokidar) {
throw new Error('watch requires chokidar to be installed');
}
this.watcher = chokidar.watch();
this.watcher.on('change', (fullname) => {
this.emit('update', this.pathsToNames[fullname], fullname);
});
this.watcher.on('error', (error) => {
console.log('Watcher error: ' + error);
});
this.on('load', (name, source) => {
this.watcher.add(source.path);
});
}
}
getSource(name) {
// Don't allow file-system traversal
if ((/^\.?\.?\//).test(name)) {
return null;
}
let fullpath;
try {
fullpath = require.resolve(name);
} catch (e) {
return null;
}
this.pathsToNames[fullpath] = name;
const source = {
src: fs.readFileSync(fullpath, 'utf-8'),
path: fullpath,
noCache: this.noCache,
};
this.emit('load', name, source);
return source;
}
}
module.exports = {
FileSystemLoader: FileSystemLoader,
PrecompiledLoader: PrecompiledLoader,
NodeResolveLoader: NodeResolveLoader,
};