yomichan/ext/js/media/audio-downloader.js
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JavaScript

/*
* Copyright (C) 2017-2022 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
* JsonSchema
* NativeSimpleDOMParser
* SimpleDOMParser
* StringUtil
*/
class AudioDownloader {
constructor({japaneseUtil, requestBuilder}) {
this._japaneseUtil = japaneseUtil;
this._requestBuilder = requestBuilder;
this._customAudioListSchema = null;
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)],
['custom-json', this._getInfoCustomJson.bind(this)]
]);
}
async getTermAudioInfoList(source, term, reading) {
const handler = this._getInfoHandlers.get(source.type);
if (typeof handler === 'function') {
try {
return await handler(term, reading, source);
} catch (e) {
// NOP
}
}
return [];
}
async downloadTermAudio(sources, preferredAudioIndex, term, reading) {
for (const source of sources) {
let infoList = await this.getTermAudioInfoList(source, term, reading);
if (typeof preferredAudioIndex === 'number') {
infoList = (preferredAudioIndex >= 0 && preferredAudioIndex < infoList.length ? [infoList[preferredAudioIndex]] : []);
}
for (const info of infoList) {
switch (info.type) {
case 'url':
try {
return await this._downloadAudioFromUrl(info.url, source.type);
} catch (e) {
// NOP
}
break;
}
}
}
throw new Error('Could not download audio');
}
// Private
_normalizeUrl(url, base) {
return new URL(url, base).href;
}
async _getInfoJpod101(term, reading) {
if (reading === term && this._japaneseUtil.isStringEntirelyKana(term)) {
reading = term;
term = null;
}
const params = new URLSearchParams();
if (term) {
params.set('kanji', term);
}
if (reading) {
params.set('kana', reading);
}
const url = `https://assets.languagepod101.com/dictionary/japanese/audiomp3.php?${params.toString()}`;
return [{type: 'url', url}];
}
async _getInfoJpod101Alternate(term, reading) {
const fetchUrl = 'https://www.japanesepod101.com/learningcenter/reference/dictionary_post';
const data = new URLSearchParams({
post: 'dictionary_reference',
match_type: 'exact',
search_query: term,
vulgar: 'true'
});
const response = await this._requestBuilder.fetchAnonymous(fetchUrl, {
method: 'POST',
mode: 'cors',
cache: 'default',
credentials: 'omit',
redirect: 'follow',
referrerPolicy: 'no-referrer',
headers: {
'Content-Type': 'application/x-www-form-urlencoded'
},
body: data
});
const responseText = await response.text();
const dom = this._createSimpleDOMParser(responseText);
for (const row of dom.getElementsByClassName('dc-result-row')) {
try {
const audio = dom.getElementByTagName('audio', row);
if (audio === null) { continue; }
const source = dom.getElementByTagName('source', audio);
if (source === null) { continue; }
let url = dom.getAttribute(source, 'src');
if (url === null) { continue; }
const htmlReadings = dom.getElementsByClassName('dc-vocab_kana');
if (htmlReadings.length === 0) { continue; }
const htmlReading = dom.getTextContent(htmlReadings[0]);
if (htmlReading && (reading === term || reading === htmlReading)) {
url = this._normalizeUrl(url, response.url);
return [{type: 'url', url}];
}
} catch (e) {
// NOP
}
}
throw new Error('Failed to find audio URL');
}
async _getInfoJisho(term, reading) {
const fetchUrl = `https://jisho.org/search/${term}`;
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_${term}:${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', url}];
}
}
}
} catch (e) {
// NOP
}
throw new Error('Failed to find audio URL');
}
async _getInfoTextToSpeech(term, reading, {voice}) {
if (!voice) {
throw new Error('No voice');
}
return [{type: 'tts', text: term, voice: voice}];
}
async _getInfoTextToSpeechReading(term, reading, {voice}) {
if (!voice) {
throw new Error('No voice');
}
return [{type: 'tts', text: reading, voice: voice}];
}
async _getInfoCustom(term, reading, {url}) {
url = this._getCustomUrl(term, reading, url);
return [{type: 'url', url}];
}
async _getInfoCustomJson(term, reading, {url}) {
url = this._getCustomUrl(term, reading, 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: ${response.status}`);
}
const responseJson = await response.json();
if (this._customAudioListSchema === null) {
const schema = await this._getCustomAudioListSchema();
this._customAudioListSchema = new JsonSchema(schema);
}
this._customAudioListSchema.validate(responseJson);
const results = [];
for (const {url: url2, name} of responseJson.audioSources) {
const info = {type: 'url', url: url2};
if (typeof name === 'string') { info.name = name; }
results.push(info);
}
return results;
}
_getCustomUrl(term, reading, url) {
if (typeof url !== 'string') {
throw new Error('No custom URL defined');
}
const data = {term, reading};
return url.replace(/\{([^}]*)\}/g, (m0, m1) => (Object.prototype.hasOwnProperty.call(data, m1) ? `${data[m1]}` : m0));
}
async _downloadAudioFromUrl(url, sourceType) {
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, sourceType)) {
throw new Error('Could not retrieve audio');
}
const data = StringUtil.arrayBufferToBase64(arrayBuffer);
const contentType = response.headers.get('Content-Type');
return {data, contentType};
}
async _isAudioBinaryValid(arrayBuffer, sourceType) {
switch (sourceType) {
case 'jpod101':
{
const digest = await this._arrayBufferDigest(arrayBuffer);
switch (digest) {
case 'ae6398b5a27bc8c0a771df6c907ade794be15518174773c58c7c7ddd17098906': // Invalid audio
return false;
default:
return true;
}
}
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;
}
_createSimpleDOMParser(content) {
if (typeof NativeSimpleDOMParser !== 'undefined' && NativeSimpleDOMParser.isSupported()) {
return new NativeSimpleDOMParser(content);
} else if (typeof SimpleDOMParser !== 'undefined' && SimpleDOMParser.isSupported()) {
return new SimpleDOMParser(content);
} else {
throw new Error('DOM parsing not supported');
}
}
async _getCustomAudioListSchema() {
const url = chrome.runtime.getURL('/data/schemas/custom-audio-list-schema.json');
const response = await fetch(url, {
method: 'GET',
mode: 'no-cors',
cache: 'default',
credentials: 'omit',
redirect: 'follow',
referrerPolicy: 'no-referrer'
});
return await response.json();
}
}