@se7enwang/ghost-qn-store/index.js

Qiniu store for Ghost blog.

/**
 * Qiniu storage module for Ghost blog 1.x
 * @see https://docs.ghost.org/v1.0.0/docs/using-a-custom-storage-module
 */

'use strict';

const path = require('path');
const fs = require('fs');
const urlParse = require('url').parse;
const Promise = require('bluebird');
const moment = require('moment');
const qn = require('qn');
const StorageBase = require('ghost-storage-base');
const security = require('@tryghost/security');

const getHash = require('./lib/getHash');
const logPrefix = '[QiniuStore]';

class QiniuStore extends StorageBase {
  constructor(options) {
    super(options);

    this.options = options || {};
    this.client = qn.create(this.options);
  }

  /**
   * Saves the image to storage
   * - image is the express image object
   * - returns a promise which ultimately returns the full url to the uploaded image
   *
   * @param file
   * @param targetDir
   * @returns {*}
   */
  save(file, targetDir) {
    const client = this.client;
    const _this = this;

    return new Promise(function(resolve, reject) {
      _this.getFileKey(file).then((function(key) {
        client.upload(fs.createReadStream(file.path), {
          key: key
        }, function(err, result) {
          console.log(logPrefix, result);
          // console.log('[' + err.code + '] ' + err.name);
          err ? reject(err) : resolve(result.url);
        });
      }));
    });
  }

  /**
   * don't need it in Qiniu
   * @param filename
   * @param targetDir
   * @returns {*|bluebird}
   * @see https://support.qiniu.com/hc/kb/article/112817/
   * TODO: if fileKey option set, should use key to check file whether exists
   */
  exists(filename, targetDir) {
    return new Promise(function(resolve, reject) {
      resolve(false);
    });
  }

  /*
  exists(filename) {
    return new Promise(function(resolve, reject) {
      // send key to get image info
      client.stat(filename, function(err, info) {
        if (info) {
          resolve(true);
        } else if (err && err.code === 612) { // File not exists
          resolve(false);
        } else {
          reject('Can\'t get file info.');
        }
      });
    });
  }*/

  // middleware for serving the files
  serve() {
    // a no-op, these are absolute URLs
    return function(req, res, next) {
      next();
    };
  }

  /**
   * Not implemented.
   * @description not really delete from Qiniu, may be implemented later
   * @param fileName
   * @param targetDir
   * @returns {*|bluebird}
   */
  delete(fileName, targetDir) {
    // return Promise.reject('not implemented');
    return new Promise(function(resolve, reject) {
      resolve(true);
    });
  }

  /**
   * Reads bytes from Qiniu for a target image
   *
   * @param options
   */
  read(options) {
    options = options || {};

    const client = this.client;
    const key = urlParse(options.path).pathname.slice(1);

    return new Promise(function(resolve, reject) {
      client.download(key, function(err, content, res) {
        if (err) {
          return reject(err)
        }

        resolve(content);
      });
    });
  }

  getFileKey(file) {
    const keyOptions = this.options.fileKey;
    let fileKey = null;

    if (keyOptions) {
      const getValue = function(obj) {
        return typeof obj === 'function' ? obj() : obj;
      };
      const ext = path.extname(file.name);
      let basename = path.basename(file.name, ext);
      let prefix = '';
      let suffix = '';
      let extname = '';

      if (keyOptions.prefix) {
        prefix = moment().format(getValue(keyOptions.prefix))
          .replace(/^\//, '');
      }

      if (keyOptions.suffix) {
        suffix = getValue(keyOptions.suffix);
      }

      if (keyOptions.extname !== false) {
        extname = ext.toLowerCase();
      }

      const contactKey = function(name) {
        return prefix + name + suffix + extname;
      };

      if (keyOptions.hashAsBasename) {
        return getHash(file).then(function(hash) {
          return contactKey(hash);
        });
      } else if (keyOptions.safeString) {
        basename = security.string.safe(basename);
      }

      fileKey = contactKey(basename);
    }

    return Promise.resolve(fileKey);
  }
}

module.exports = QiniuStore;