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index.js
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index.js
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/**!
* urlmock - index.js
*
* Copyright(c) fengmk2 and other contributors.
* MIT Licensed
*
* Authors:
* fengmk2 <fengmk2@gmail.com> (http://fengmk2.github.com)
*/
'use strict';
/**
* Module dependencies.
*/
var debug = require('debug')('urlmock');
var path = require('path');
var fs = require('fs');
var urlparse = require('url').parse;
var extend = require('extend');
module.exports = urlmock;
module.exports.mapping = mapping;
module.exports.load = load;
module.exports.findAllScenes = findAllScenes;
function urlmock(datadir, ctx) {
// urlmock(datadir, koa-ctx)
// urlmock(datadir, url)
var url = typeof ctx === 'string' ? ctx : ctx.url;
var paths = mapping(datadir, url);
for (var i = 0; i < paths.length; i++) {
var filepath = paths[i];
try {
var data = load(filepath, ctx);
return data;
} catch (err) {
if (err.code !== 'MODULE_NOT_FOUND') {
throw err;
}
}
}
throw new Error("Cannot find mock data file in '" + paths.join(', ') + "'");
}
// {url}?__scene={scene} => {datadir}{url}/{scene}.js
function mapping(datadir, url) {
var info = urlparse(url, true);
var pathname = info.pathname.replace(/^\/+/g, '');
var scene = (info.query && info.query.__scene || '').trim();
scene = scene || 'default';
scene = scene.replace(/\.(js|json)$/, '');
var m = / \(([^\)]+)\.(?:js|json)\)$/.exec(scene);
if (m) {
scene = m[1];
}
var paths = [
path.join(datadir, pathname, scene + '.js'),
path.join(datadir, pathname, scene + '.json'),
];
// try to remove `.ext`, like `/user/foo.htm` => `/user/foo`
var ext = path.extname(pathname);
// should ignore `/foo.`
if (ext && ext.length > 1) {
pathname = pathname.substring(0, pathname.lastIndexOf('.'));
paths.push(path.join(datadir, pathname, scene + '.js'));
paths.push(path.join(datadir, pathname, scene + '.json'));
}
return paths;
}
function load(filepath, ctx) {
var merged = {};
var data = require(filepath);
if (typeof data === 'function') {
// module.exports = function load(ctx) {}
data = data(ctx);
}
if (Array.isArray(data)) {
return data;
}
// skip __requires, __name
for (var key in data) {
if (key === '__requires') {
continue;
}
if (key === '__name') {
continue;
}
merged[key] = data[key];
}
if (data.__requires) {
var requires = data.__requires;
// delete data.__requires;
if (typeof requires === 'string') {
// support `__requires: '../common'`
requires = [requires];
}
// requireMerged <= r1 <= r2 <= r3
var requireMerged = {};
requires.forEach(function (requirepath) {
requirepath = path.join(path.dirname(filepath), requirepath);
var requireData = load(requirepath, ctx);
extend(true, requireMerged, requireData);
});
// merged = requireMerged <= merged
merged = extend(true, requireMerged, merged);
}
debug('load %s got %j', filepath, merged);
return merged;
}
function findAllScenes(datadir, url) {
var scenes = {};
var info = urlparse(url, true);
var pathname = info.pathname.replace(/^\/+/g, '');
var dir = path.join(datadir, pathname);
if (!fs.existsSync(dir)) {
dir = null;
// try to remove `.ext`, like `/user/foo.htm` => `/user/foo`
var ext = path.extname(pathname);
// should ignore `/foo.`
if (ext && ext.length > 1) {
pathname = pathname.substring(0, pathname.lastIndexOf('.'));
dir = path.join(datadir, pathname);
}
}
if (dir && fs.existsSync(dir)) {
var filepaths = fs.readdirSync(dir).map(function (name) {
return path.join(dir, name);
}).filter(function (filepath) {
if (fs.statSync(filepath).isDirectory()) {
return false;
}
var ext = path.extname(filepath);
if (ext === '.js' || ext === '.json') {
return true;
}
return false;
});
filepaths.map(function (filepath) {
var filename = path.basename(filepath);
// use filename as default name
var name = filename.substring(0, filename.lastIndexOf('.'));
try {
var data = require(filepath);
if (data && data.__name) {
name = data.__name;
}
} catch (_) {}
scenes[filename] = name;
});
}
return scenes;
}