Qiniu storage for Ghost 0.5.2

ghost_0.5.2_qiniu.js

// # Local File System Image Storage module
// The (default) module for storing images, using the local file system

var express   = require('express'),
    fs        = require('fs-extra'),
    path      = require('path'),
    util      = require('util'),
    Promise   = require('bluebird'),
    errors    = require('../errors'),
    config    = require('../config'),
    utils     = require('../utils'),
    baseStore = require('./base'),

    crypto       = require('crypto'),
    qiniu        = require('qiniu'),
    
    qiniuConfig  = {
      bucketname: '',
      ACCESS_KEY: '',
      SECRET_KEY: '',
      root: '/images/',
      prefix: ''
    };
    
    qiniu.conf.ACCESS_KEY = qiniuConfig.ACCESS_KEY;
    qiniu.conf.SECRET_KEY = qiniuConfig.SECRET_KEY;
    qiniu.conf.USER_AGENT = 'Ghost 0.5.2';

var putPolicy = new qiniu.rs.PutPolicy(qiniuConfig.bucketname),
    uptoken = putPolicy.token();

function Qiniu() {}
util.inherits(Qiniu, baseStore);

// ### Save
// Saves the image to storage (the file system)
// - image is the express image object
// - returns a promise which ultimately returns the full url to the uploaded image
Qiniu.prototype.save = function (image) {
    var md5sum = crypto.createHash('md5'),
        ext = path.extname(image.name),
        targetDirRoot = qiniuConfig.root,
        targetFilename,
        key,
        extra = new qiniu.io.PutExtra();

      var savedpath = path.join(config.paths.imagesPath, image.name);

    return Promise.promisify(fs.copy)(image.path, savedpath).then(function() {
        return Promise.promisify(fs.readFile)(savedpath);
    }).then(function(data) {
        var md5 = md5sum.update(data).digest('hex');

        targetFilename = path.join(targetDirRoot, md5.replace(/^(\w{1})(\w{2})(\w+)$/, '$1/$2/$3')) + ext;
        targetFilename = targetFilename.replace(/\\/g, '/');
        key = targetFilename.replace(/^\//, '');

        return Promise.promisify(qiniu.io.put)(uptoken, key, data, extra);
    }).then(function () {
        return qiniuConfig.prefix + targetFilename;
    }).catch(function (e) {
        errors.logError(e);
        return Promise.reject(e);
    });
};

Qiniu.prototype.exists = function (filename) {
    return new Promise(function (resolve) {
        fs.exists(filename, function (exists) {
            resolve(exists);
        });
    });
};

// middleware for serving the files
Qiniu.prototype.serve = function () {
    // For some reason send divides the max age number by 1000
    return express['static'](config.paths.imagesPath, {maxAge: utils.ONE_YEAR_MS});
};

module.exports = Qiniu;