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/*
* Copyright (C) 2017-2020 Yomichan Authors
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
/* global
* NativeSimpleDOMParser
*/
class AudioDownloader {
constructor({japaneseUtil, requestBuilder}) {
this._japaneseUtil = japaneseUtil;
this._requestBuilder = requestBuilder;
this._getInfoHandlers = new Map([
['jpod101', this._getInfoJpod101.bind(this)],
['jpod101-alternate', this._getInfoJpod101Alternate.bind(this)],
['jisho', this._getInfoJisho.bind(this)],
['text-to-speech', this._getInfoTextToSpeech.bind(this)],
['text-to-speech-reading', this._getInfoTextToSpeechReading.bind(this)],
['custom', this._getInfoCustom.bind(this)]
]);
}
async getInfo(source, expression, reading, details) {
const handler = this._getInfoHandlers.get(source);
if (typeof handler === 'function') {
try {
return await handler(expression, reading, details);
} catch (e) {
// NOP
}
}
return null;
}
async downloadAudio(sources, expression, reading, details) {
for (const source of sources) {
const info = await this.getInfo(source, expression, reading, details);
if (info === null) { continue; }
switch (info.type) {
case 'url':
try {
const {details: {url}} = info;
return await this._downloadAudioFromUrl(url);
} catch (e) {
// NOP
}
break;
}
}
throw new Error('Could not download audio');
}
// Private
_normalizeUrl(url, base) {
return new URL(url, base).href;
}
async _getInfoJpod101(expression, reading) {
let kana = reading;
let kanji = expression;
if (!kana && this._japaneseUtil.isStringEntirelyKana(kanji)) {
kana = kanji;
kanji = null;
}
const params = [];
if (kanji) {
params.push(`kanji=${encodeURIComponent(kanji)}`);
}
if (kana) {
params.push(`kana=${encodeURIComponent(kana)}`);
}
const url = `https://assets.languagepod101.com/dictionary/japanese/audiomp3.php?${params.join('&')}`;
return {type: 'url', details: {url}};
}
async _getInfoJpod101Alternate(expression, reading) {
const fetchUrl = 'https://www.japanesepod101.com/learningcenter/reference/dictionary_post';
const data = `post=dictionary_reference&match_type=exact&search_query=${encodeURIComponent(expression)}&vulgar=true`;
const response = await this._requestBuilder.fetchAnonymous(fetchUrl, {
method: 'POST',
mode: 'cors',
cache: 'default',
credentials: 'omit',
redirect: 'follow',
referrerPolicy: 'no-referrer',
headers: {
'Content-Type': 'application/x-www-form-urlencoded'
},
body: data
});
const responseText = await response.text();
const dom = this._createSimpleDOMParser(responseText);
for (const row of dom.getElementsByClassName('dc-result-row')) {
try {
const audio = dom.getElementByTagName('audio', row);
if (audio === null) { continue; }
const source = dom.getElementByTagName('source', audio);
if (source === null) { continue; }
let url = dom.getAttribute(source, 'src');
if (url === null) { continue; }
const htmlReadings = dom.getElementsByClassName('dc-vocab_kana');
if (htmlReadings.length === 0) { continue; }
const htmlReading = dom.getTextContent(htmlReadings[0]);
if (htmlReading && (!reading || reading === htmlReading)) {
url = this._normalizeUrl(url, response.url);
return {type: 'url', details: {url}};
}
} catch (e) {
// NOP
}
}
throw new Error('Failed to find audio URL');
}
async _getInfoJisho(expression, reading) {
const fetchUrl = `https://jisho.org/search/${expression}`;
const response = await this._requestBuilder.fetchAnonymous(fetchUrl, {
method: 'GET',
mode: 'cors',
cache: 'default',
credentials: 'omit',
redirect: 'follow',
referrerPolicy: 'no-referrer'
});
const responseText = await response.text();
const dom = this._createSimpleDOMParser(responseText);
try {
const audio = dom.getElementById(`audio_${expression}:${reading}`);
if (audio !== null) {
const source = dom.getElementByTagName('source', audio);
if (source !== null) {
let url = dom.getAttribute(source, 'src');
if (url !== null) {
url = this._normalizeUrl(url, response.url);
return {type: 'url', details: {url}};
}
}
}
} catch (e) {
// NOP
}
throw new Error('Failed to find audio URL');
}
async _getInfoTextToSpeech(expression, reading, {textToSpeechVoice}) {
if (!textToSpeechVoice) {
throw new Error('No voice');
}
return {type: 'tts', details: {text: expression, voice: textToSpeechVoice}};
}
async _getInfoTextToSpeechReading(expression, reading, {textToSpeechVoice}) {
if (!textToSpeechVoice) {
throw new Error('No voice');
}
return {type: 'tts', details: {text: reading || expression, voice: textToSpeechVoice}};
}
async _getInfoCustom(expression, reading, {customSourceUrl}) {
if (typeof customSourceUrl !== 'string') {
throw new Error('No custom URL defined');
}
const data = {expression, reading};
const url = customSourceUrl.replace(/\{([^}]*)\}/g, (m0, m1) => (hasOwn(data, m1) ? `${data[m1]}` : m0));
return {type: 'url', details: {url}};
}
async _downloadAudioFromUrl(url) {
const response = await this._requestBuilder.fetchAnonymous(url, {
method: 'GET',
mode: 'cors',
cache: 'default',
credentials: 'omit',
redirect: 'follow',
referrerPolicy: 'no-referrer'
});
if (!response.ok) {
throw new Error(`Invalid response: ${response.status}`);
}
const arrayBuffer = await response.arrayBuffer();
if (!await this._isAudioBinaryValid(arrayBuffer)) {
throw new Error('Could not retrieve audio');
}
return this._arrayBufferToBase64(arrayBuffer);
}
async _isAudioBinaryValid(arrayBuffer) {
const digest = await this._arrayBufferDigest(arrayBuffer);
switch (digest) {
case 'ae6398b5a27bc8c0a771df6c907ade794be15518174773c58c7c7ddd17098906': // jpod101 invalid audio
return false;
default:
return true;
}
}
async _arrayBufferDigest(arrayBuffer) {
const hash = new Uint8Array(await crypto.subtle.digest('SHA-256', new Uint8Array(arrayBuffer)));
let digest = '';
for (const byte of hash) {
digest += byte.toString(16).padStart(2, '0');
}
return digest;
}
_arrayBufferToBase64(arrayBuffer) {
return btoa(String.fromCharCode(...new Uint8Array(arrayBuffer)));
}
_createSimpleDOMParser(content) {
if (NativeSimpleDOMParser.isSupported()) {
return new NativeSimpleDOMParser(content);
} else {
throw new Error('DOM parsing not supported');
}
}
}
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