src/files.js

   1 'use strict';
   2
   3 var fs = require('fs'),
   4     path = require('path'),
   5     rm = require('del'),
   6     debug = require('debug')('files'),
   7     mkdirp = require('mkdirp'),
   8     HttpError = require('connect-lastmile').HttpError,
   9     HttpSuccess = require('connect-lastmile').HttpSuccess;
  10
  11 var gBasePath;
  12
  13 exports = module.exports = function (basePath) {
  14     gBasePath = basePath;
  15
  16     return {
  17         get: get,
  18         put: put,
  19         del: del
  20     };
  21 };
  22
  23 // http://stackoverflow.com/questions/11293857/fastest-way-to-copy-file-in-node-js
  24 function copyFile(source, target, cb) {
  25     var cbCalled = false;
  26
  27     // ensure directory
  28     mkdirp(path.dirname(target), function (error) {
  29         if (error) return cb(error);
  30
  31         var rd = fs.createReadStream(source);
  32             rd.on("error", function(err) {
  33             done(err);
  34         });
  35
  36         var wr = fs.createWriteStream(target);
  37             wr.on("error", function(err) {
  38             done(err);
  39         });
  40
  41         wr.on("close", function(ex) {
  42             done();
  43         });
  44
  45         rd.pipe(wr);
  46
  47         function done(err) {
  48             if (!cbCalled) {
  49                 cb(err);
  50                 cbCalled = true;
  51             }
  52         }
  53     });
  54 }
  55
  56 function getAbsolutePath(filePath) {
  57     var absoluteFilePath = path.resolve(path.join(gBasePath, filePath));
  58
  59     if (absoluteFilePath.indexOf(gBasePath) !== 0) return null;
  60     return absoluteFilePath;
  61 }
  62
  63 function get(req, res, next) {
  64     var filePath = req.params[0];
  65     var absoluteFilePath = getAbsolutePath(filePath);
  66     if (!absoluteFilePath) return next(new HttpError(403, 'Path not allowed'));
  67
  68     fs.stat(absoluteFilePath, function (error, result) {
  69         if (error) return next(new HttpError(404, error));
  70
  71         debug('get', absoluteFilePath);
  72
  73         if (result.isFile()) return res.sendFile(absoluteFilePath);
  74         if (result.isDirectory()) return res.status(222).send({ entries: fs.readdirSync(absoluteFilePath) });
  75
  76         return next(new HttpError(500, 'unsupported type'));
  77     });
  78 }
  79
  80 function put(req, res, next) {
  81     var filePath = req.params[0];
  82
  83     if (!req.files.file) return next(new HttpError(400, 'missing file'));
  84
  85     var absoluteFilePath = getAbsolutePath(filePath);
  86     if (!absoluteFilePath) return next(new HttpError(403, 'Path not allowed'));
  87
  88     fs.stat(absoluteFilePath, function (error, result) {
  89         if (error && error.code !== 'ENOENT') return next(new HttpError(500, error));
  90
  91         debug('put', absoluteFilePath, req.files.file);
  92
  93         if (result && result.isDirectory()) return next(new HttpError(409, 'cannot put on directories'));
  94         if (!result || result.isFile()) {
  95             return copyFile(req.files.file.path, absoluteFilePath, function (error) {
  96                 if (error) return next(new HttpError(500, error));
  97                 next(new HttpSuccess(201, {}));
  98             });
  99         }
 100
 101         return next(new HttpError(500, 'unsupported type'));
 102     });
 103 }
 104
 105 function del(req, res, next) {
 106     var filePath = req.params[0];
 107     var absoluteFilePath = getAbsolutePath(filePath);
 108     if (!absoluteFilePath) return next(new HttpError(404, 'Not found'));
 109     if (absoluteFilePath.slice(gBasePath.length) === '') return next(new HttpError(403, 'Forbidden'));
 110
 111     fs.stat(absoluteFilePath, function (error, result) {
 112         if (error) return next(new HttpError(404, error));
 113
 114         rm(absoluteFilePath, function (error, result) {
 115             if (error) return next(new HttpError(500, 'Unable to remove'));
 116             next(new HttpSuccess(200, { entries: result }));
 117         });
 118     });
 119 }