tourism-wxapp/node_modules/parse/lib/react-native/ParseFile.js

/**
 * Copyright (c) 2015-present, Parse, LLC.
 * All rights reserved.
 *
 * This source code is licensed under the BSD-style license found in the
 * LICENSE file in the root directory of this source tree. An additional grant
 * of patent rights can be found in the PATENTS file in the same directory.
 *
 * @flow
 */

/* global XMLHttpRequest, Blob */
import CoreManager from './CoreManager';
/*:: import type { FullOptions } from './RESTController';*/

let XHR = null;

if (typeof XMLHttpRequest !== 'undefined') {
  XHR = XMLHttpRequest;
}

/*:: type Base64 = { base64: string };*/

/*:: type Uri = { uri: string };*/

/*:: type FileData = Array<number> | Base64 | Blob | Uri;*/

/*:: export type FileSource = {
  format: 'file';
  file: Blob;
  type: string
} | {
  format: 'base64';
  base64: string;
  type: string
} | {
  format: 'uri';
  uri: string;
  type: string
};*/
const dataUriRegexp = /^data:([a-zA-Z]+\/[-a-zA-Z0-9+.]+)(;charset=[a-zA-Z0-9\-\/]*)?;base64,/;

function b64Digit(number
/*: number*/
)
/*: string*/
{
  if (number < 26) {
    return String.fromCharCode(65 + number);
  }

  if (number < 52) {
    return String.fromCharCode(97 + (number - 26));
  }

  if (number < 62) {
    return String.fromCharCode(48 + (number - 52));
  }

  if (number === 62) {
    return '+';
  }

  if (number === 63) {
    return '/';
  }

  throw new TypeError('Tried to encode large digit ' + number + ' in base64.');
}
/**
 * A Parse.File is a local representation of a file that is saved to the Parse
 * cloud.
 * @alias Parse.File
 */


class ParseFile {
  /*:: _name: string;*/

  /*:: _url: ?string;*/

  /*:: _source: FileSource;*/

  /*:: _previousSave: ?Promise<ParseFile>;*/

  /*:: _data: ?string;*/

  /**
   * @param name {String} The file's name. This will be prefixed by a unique
   *     value once the file has finished saving. The file name must begin with
   *     an alphanumeric character, and consist of alphanumeric characters,
   *     periods, spaces, underscores, or dashes.
   * @param data {Array} The data for the file, as either:
   *     1. an Array of byte value Numbers, or
   *     2. an Object like { base64: "..." } with a base64-encoded String.
   *     3. an Object like { uri: "..." } with a uri String.
   *     4. a File object selected with a file upload control. (3) only works
   *        in Firefox 3.6+, Safari 6.0.2+, Chrome 7+, and IE 10+.
   *        For example:
   * <pre>
   * var fileUploadControl = $("#profilePhotoFileUpload")[0];
   * if (fileUploadControl.files.length > 0) {
   *   var file = fileUploadControl.files[0];
   *   var name = "photo.jpg";
   *   var parseFile = new Parse.File(name, file);
   *   parseFile.save().then(function() {
   *     // The file has been saved to Parse.
   *   }, function(error) {
   *     // The file either could not be read, or could not be saved to Parse.
   *   });
   * }</pre>
   * @param type {String} Optional Content-Type header to use for the file. If
   *     this is omitted, the content type will be inferred from the name's
   *     extension.
   */
  constructor(name
  /*: string*/
  , data
  /*:: ?: FileData*/
  , type
  /*:: ?: string*/
  ) {
    const specifiedType = type || '';
    this._name = name;

    if (data !== undefined) {
      if (Array.isArray(data)) {
        this._data = ParseFile.encodeBase64(data);
        this._source = {
          format: 'base64',
          base64: this._data,
          type: specifiedType
        };
      } else if (typeof Blob !== 'undefined' && data instanceof Blob) {
        this._source = {
          format: 'file',
          file: data,
          type: specifiedType
        };
      } else if (data && typeof data.uri === 'string' && data.uri !== undefined) {
        this._source = {
          format: 'uri',
          uri: data.uri,
          type: specifiedType
        };
      } else if (data && typeof data.base64 === 'string') {
        const base64 = data.base64;
        const commaIndex = base64.indexOf(',');

        if (commaIndex !== -1) {
          const matches = dataUriRegexp.exec(base64.slice(0, commaIndex + 1)); // if data URI with type and charset, there will be 4 matches.

          this._data = base64.slice(commaIndex + 1);
          this._source = {
            format: 'base64',
            base64: this._data,
            type: matches[1]
          };
        } else {
          this._data = base64;
          this._source = {
            format: 'base64',
            base64: base64,
            type: specifiedType
          };
        }
      } else {
        throw new TypeError('Cannot create a Parse.File with that data.');
      }
    }
  }
  /**
   * Return the data for the file, downloading it if not already present.
   * Data is present if initialized with Byte Array, Base64 or Saved with Uri.
   * Data is cleared if saved with File object selected with a file upload control
   *
   * @return {Promise} Promise that is resolve with base64 data
   */


  async getData()
  /*: Promise<String>*/
  {
    if (this._data) {
      return this._data;
    }

    if (!this._url) {
      throw new Error('Cannot retrieve data for unsaved ParseFile.');
    }

    const controller = CoreManager.getFileController();
    const result = await controller.download(this._url);
    this._data = result.base64;
    return this._data;
  }
  /**
   * Gets the name of the file. Before save is called, this is the filename
   * given by the user. After save is called, that name gets prefixed with a
   * unique identifier.
   * @return {String}
   */


  name()
  /*: string*/
  {
    return this._name;
  }
  /**
   * Gets the url of the file. It is only available after you save the file or
   * after you get the file from a Parse.Object.
   * @param {Object} options An object to specify url options
   * @return {String}
   */


  url(options
  /*:: ?: { forceSecure?: boolean }*/
  )
  /*: ?string*/
  {
    options = options || {};

    if (!this._url) {
      return;
    }

    if (options.forceSecure) {
      return this._url.replace(/^http:\/\//i, 'https://');
    } else {
      return this._url;
    }
  }
  /**
   * Saves the file to the Parse cloud.
   * @param {Object} options
   *  * Valid options are:<ul>
   *   <li>useMasterKey: In Cloud Code and Node only, causes the Master Key to
   *     be used for this request.
   *   <li>progress: In Browser only, callback for upload progress
   * </ul>
   * @return {Promise} Promise that is resolved when the save finishes.
   */


  save(options
  /*:: ?: FullOptions*/
  ) {
    options = options || {};
    const controller = CoreManager.getFileController();

    if (!this._previousSave) {
      if (this._source.format === 'file') {
        this._previousSave = controller.saveFile(this._name, this._source, options).then(res => {
          this._name = res.name;
          this._url = res.url;
          this._data = null;
          return this;
        });
      } else if (this._source.format === 'uri') {
        this._previousSave = controller.download(this._source.uri).then(result => {
          const newSource = {
            format: 'base64',
            base64: result.base64,
            type: result.contentType
          };
          this._data = result.base64;
          return controller.saveBase64(this._name, newSource, options);
        }).then(res => {
          this._name = res.name;
          this._url = res.url;
          return this;
        });
      } else {
        this._previousSave = controller.saveBase64(this._name, this._source, options).then(res => {
          this._name = res.name;
          this._url = res.url;
          return this;
        });
      }
    }

    if (this._previousSave) {
      return this._previousSave;
    }
  }

  toJSON()
  /*: { name: ?string, url: ?string }*/
  {
    return {
      __type: 'File',
      name: this._name,
      url: this._url
    };
  }

  equals(other
  /*: mixed*/
  )
  /*: boolean*/
  {
    if (this === other) {
      return true;
    } // Unsaved Files are never equal, since they will be saved to different URLs


    return other instanceof ParseFile && this.name() === other.name() && this.url() === other.url() && typeof this.url() !== 'undefined';
  }

  static fromJSON(obj)
  /*: ParseFile*/
  {
    if (obj.__type !== 'File') {
      throw new TypeError('JSON object does not represent a ParseFile');
    }

    const file = new ParseFile(obj.name);
    file._url = obj.url;
    return file;
  }

  static encodeBase64(bytes
  /*: Array<number>*/
  )
  /*: string*/
  {
    const chunks = [];
    chunks.length = Math.ceil(bytes.length / 3);

    for (let i = 0; i < chunks.length; i++) {
      const b1 = bytes[i * 3];
      const b2 = bytes[i * 3 + 1] || 0;
      const b3 = bytes[i * 3 + 2] || 0;
      const has2 = i * 3 + 1 < bytes.length;
      const has3 = i * 3 + 2 < bytes.length;
      chunks[i] = [b64Digit(b1 >> 2 & 0x3F), b64Digit(b1 << 4 & 0x30 | b2 >> 4 & 0x0F), has2 ? b64Digit(b2 << 2 & 0x3C | b3 >> 6 & 0x03) : '=', has3 ? b64Digit(b3 & 0x3F) : '='].join('');
    }

    return chunks.join('');
  }

}

const DefaultController = {
  saveFile: function (name
  /*: string*/
  , source
  /*: FileSource*/
  , options
  /*:: ?: FullOptions*/
  ) {
    if (source.format !== 'file') {
      throw new Error('saveFile can only be used with File-type sources.');
    } // To directly upload a File, we use a REST-style AJAX request


    const headers = {
      'X-Parse-Application-ID': CoreManager.get('APPLICATION_ID'),
      'Content-Type': source.type || (source.file ? source.file.type : null)
    };
    const jsKey = CoreManager.get('JAVASCRIPT_KEY');

    if (jsKey) {
      headers['X-Parse-JavaScript-Key'] = jsKey;
    }

    let url = CoreManager.get('SERVER_URL');

    if (url[url.length - 1] !== '/') {
      url += '/';
    }

    url += 'files/' + name;
    return CoreManager.getRESTController().ajax('POST', url, source.file, headers, options).then(res => res.response);
  },
  saveBase64: function (name
  /*: string*/
  , source
  /*: FileSource*/
  , options
  /*:: ?: FullOptions*/
  ) {
    if (source.format !== 'base64') {
      throw new Error('saveBase64 can only be used with Base64-type sources.');
    }

    const data
    /*: { base64: any; _ContentType?: any }*/
    = {
      base64: source.base64
    };

    if (source.type) {
      data._ContentType = source.type;
    }

    return CoreManager.getRESTController().request('POST', 'files/' + name, data, options);
  },
  download: function (uri) {
    if (XHR) {
      return this.downloadAjax(uri);
    } else {
      return Promise.reject('Cannot make a request: No definition of XMLHttpRequest was found.');
    }
  },
  downloadAjax: function (uri) {
    return new Promise((resolve, reject) => {
      const xhr = new XHR();
      xhr.open('GET', uri, true);
      xhr.responseType = 'arraybuffer';

      xhr.onerror = function (e) {
        reject(e);
      };

      xhr.onreadystatechange = function () {
        if (xhr.readyState !== 4) {
          return;
        }

        const bytes = new Uint8Array(this.response);
        resolve({
          base64: ParseFile.encodeBase64(bytes),
          contentType: xhr.getResponseHeader('content-type')
        });
      };

      xhr.send();
    });
  },

  _setXHR(xhr
  /*: any*/
  ) {
    XHR = xhr;
  }

};
CoreManager.setFileController(DefaultController);
export default ParseFile;