@ridi/comic-parser

@ridi/comic-parser

Common comic data parser for Ridibooks services

Features

• Single structure parsing
• Nested structure parsing
• Unzip zip file when parsing with options
• Read files
  • Read image in base64 encoding
• Encrypt and decrypt function when parsing or reading or unzipping
• Debug mode
• Environment
  • Node
  • CLI
  • Browser
• Online demo

Install

npm install @ridi/comic-parser

Usage

Basic:

import { ComicParser } from '@ridi/comic-parser';
// or const { ComicParser } = require('@ridi/comic-parser');

const parser = new ComicParser('./foo/bar.zip' or './unzippedPath');
parser.parse(/* { parseOptions } */).then((book) => {
  parser.readItems(items/*, { readOptions } */).then((results) => {
    ...
  });
  ...
});

with AesCryptor:

import { CryptoProvider, AesCryptor } from '@ridi/comic-parser';
// or const { CryptoProvider, AesCryptor } = require('@ridi/comic-parser');

const { Purpose } = CryptoProvider;
const { Mode, Padding } = AesCryptor;

class ContentCryptoProvider extends CryptoProvider {
  constructor(key) {
    super();
    this.cryptor = new AesCryptor(Mode.ECB, { key });
  }

  getCryptor(filePath, purpose) {
    return this.cryptor;
  }

  // If use as follows:
  // const provider = new ContentCryptoProvider(...);
  // const parser = new ComicParser('encrypted.zip', provider);
  // const book = await parser.parse({ unzipPath: ... });
  // const firstImage = await parser.readItem(book.items[0]);
  //
  // It will be called as follows:
  // 1. run(data, 'encrypted.zip', Purpose.READ_IN_DIR)
  // 2. run(data, '0001.jpg', Purpose.READ_IN_ZIP)
  // ...
  // 4. run(data, '0001.jpg', Purpose.WRITE)
  // ...
  // 5. run(data, '0001.jpg', Purpose.READ_IN_DIR)
  //
  run(data, filePath, purpose) {
    const cryptor = this.getCryptor(filePath, purpose);
    const padding = Padding.AUTO;
    if (purpose === Purpose.READ_IN_DIR) {
      return cryptor.decrypt(data, { padding });
    } else if (purpose === Purpose.WRITE) {
      return cryptor.encrypt(data, { padding });
    }
    return data;
  }
}

const cryptoProvider = new ContentCryptoProvider(key);
const parser = new ComicParser('./encrypted.zip' or './unzippedPath', cryptoProvider);

Log level setting:

import { LogLevel, ... } from '@ridi/comic-parser';
const parser = new ComicParser(/* path */, /* cryptoProvider */, /* logLevel */)
// or const parser = new ComicParser(/* path */, /* logLevel */)
parser.logger.logLevel = LogLevel.VERBOSE; // SILENT, ERROR, WARN(default), INFO, DEBUG, VERBOSE

API

parse(parseOptions)

Returns Promise<ComicBook> with:

• ComicBook: Instance with image path, size, etc.

Or throw exception.

parseOptions: ?object

---

readItem(item, readOptions)

Returns string or Buffer in Promise with:

• If readOptions.base64 is true:

  • string

• Other:

  • Buffer

or throw exception.

item: Item

readOptions: ?object

---

readItems(items, readOptions)

Returns string[] or Buffer[] in Promise with:

• If readOptions.base64 is true:

  • string

• Other:

  • Buffer

or throw exception.

items: Item[]

readOptions: ?object

---

unzip(unzipPath, overwrite)

Returns Promise<boolean> with:

• If result is true, unzip is successful or has already been unzipped.

Or throw exception.

unzipPath: string

overwrite: boolean

---

onProgress = callback(step, totalStep, action)

Tells the progress of parser through callback.

const { Action } = ComicParser; // PARSE, READ_ITEMS
parser.onProgress = (step, totalStep, action) => {
  console.log(`[${action}] ${step} / ${totalStep}`);
}

Model

ComicBook

• items: Item[]
• toRaw(): object

Item

• index: ?string
• path: ?string
• fileSize: ?number
• width: ?number
• height: ?number
• toRaw(): object

Parse Options

• unzipPath
• overwrite
• ext
• parseImageSize

---

unzipPath: ?string

If specified, unzip to that path.

only using if input is Zip file.

Default: undefined

---

overwrite: boolean

If true, overwrite to unzipPath when unzip.

only using if unzipPath specified.

Default: true

---

ext: string[]

File extension to allow when extracting lists.

Default: ['jpg', 'jpeg', 'png', 'bmp', 'gif']

---

parseImageSize: boolean|number

If true, image size parse. (parse may be slower.)

Default: false

Read Options

• force
• base64

---

force: boolean

If true, ignore any exceptions that occur within parser.

Default: false

---

base64: boolean

If false, reads image into a buffer.

Default: false

License

MIT

Changelog

[0.7.0 (2020-10-31)]

Changed

• Replace unzipper with adm-zip.
• Changed Parsers to accept async CryptoProvider methods.
• Added an option to the CryptoProvider to not handle stream in chunks.

Fixed

• Fix a bug where path has an additional slash in Windows.