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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
+ * SimpleDOMParser
+ * jp
+ */
+
+class AudioDownloader {
+ constructor({requestBuilder}) {
+ 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, baseUrl, basePath) {
+ if (url) {
+ if (url[0] === '/') {
+ if (url.length >= 2 && url[1] === '/') {
+ // Begins with "//"
+ url = baseUrl.substring(0, baseUrl.indexOf(':') + 1) + url;
+ } else {
+ // Begins with "/"
+ url = baseUrl + url;
+ }
+ } else if (!/^[a-z][a-z0-9\-+.]*:/i.test(url)) {
+ // No URI scheme => relative path
+ url = baseUrl + basePath + url;
+ }
+ }
+ return url;
+ }
+
+ async _getInfoJpod101(expression, reading) {
+ let kana = reading;
+ let kanji = expression;
+
+ if (!kana && jp.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 = new SimpleDOMParser(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, 'https://www.japanesepod101.com', '/learningcenter/reference/');
+ 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/${expression}`;
+ const response = await this._requestBuilder.fetchAnonymous(fetchUrl, {
+ method: 'GET',
+ mode: 'cors',
+ cache: 'default',
+ credentials: 'omit',
+ redirect: 'follow',
+ referrerPolicy: 'no-referrer'
+ });
+ const responseText = await response.text();
+
+ const dom = new SimpleDOMParser(responseText);
+ try {
+ const audio = dom.getElementById(`audio_${expression}:${reading}`);
+ if (audio !== null) {
+ const source = dom.getElementByTagName('source', audio);
+ if (source !== null) {
+ let url = dom.getAttribute(source, 'src');
+ if (url !== null) {
+ url = this._normalizeUrl(url, 'https://jisho.org', '/search/');
+ return {type: 'url', details: {url}};
+ }
+ }
+ }
+ } catch (e) {
+ // NOP
+ }
+
+ throw new Error('Failed to find audio URL');
+ }
+
+ async _getInfoTextToSpeech(expression, reading, {textToSpeechVoice}) {
+ if (!textToSpeechVoice) {
+ throw new Error('No voice');
+ }
+ return {type: 'tts', details: {text: expression, voice: textToSpeechVoice}};
+ }
+
+ async _getInfoTextToSpeechReading(expression, reading, {textToSpeechVoice}) {
+ if (!textToSpeechVoice) {
+ throw new Error('No voice');
+ }
+ return {type: 'tts', details: {text: reading || expression, voice: textToSpeechVoice}};
+ }
+
+ async _getInfoCustom(expression, reading, {customSourceUrl}) {
+ if (typeof customSourceUrl !== 'string') {
+ throw new Error('No custom URL defined');
+ }
+ const data = {expression, reading};
+ const url = customSourceUrl.replace(/\{([^}]*)\}/g, (m0, m1) => (hasOwn(data, m1) ? `${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)));
+ }
+}