Multiple custom audio sources (#1303)

* Fix label

* Fix icon size being flexible

* Add schema

* Add customSourceType option

* Update settings

* Pass customSourceType to the audio downloader

* Implement custom audio JSON mode

6 files changed, 131 insertions, 6 deletions

diff --git a/ext/bg/data/custom-audio-list-schema.json b/ext/bg/data/custom-audio-list-schema.json
new file mode 100644
index 00000000..2cb3ca78
--- /dev/null
+++ b/ext/bg/data/custom-audio-list-schema.json
@@ -0,0 +1,33 @@
+{
+    "$schema": "http://json-schema.org/draft-07/schema#",
+    "type": "object",
+    "required": [
+        "type",
+        "audioSources"
+    ],
+    "additionalProperties": false,
+    "properties": {
+        "type": {
+            "type": "string",
+            "const": "audioSourceList"
+        },
+        "audioSources": {
+            "type": "array",
+            "items": {
+                "type": "object",
+                "required": [
+                    "url"
+                ],
+                "additionalProperties": false,
+                "properties": {
+                    "name": {
+                        "type": "string"
+                    },
+                    "url": {
+                        "type": "string"
+                    }
+                }
+            }
+        }
+    }
+}
diff --git a/ext/bg/data/options-schema.json b/ext/bg/data/options-schema.json
index 189c8621..dfc553ed 100644
--- a/ext/bg/data/options-schema.json
+++ b/ext/bg/data/options-schema.json
@@ -348,6 +348,7 @@
                                     "volume",
                                     "autoPlay",
                                     "customSourceUrl",
+                                    "customSourceType",
                                     "textToSpeechVoice"
                                 ],
                                 "properties": {
@@ -387,6 +388,11 @@
                                         "type": "string",
                                         "default": ""
                                     },
+                                    "customSourceType": {
+                                        "type": "string",
+                                        "enum": ["audio", "json"],
+                                        "default": "audio"
+                                    },
                                     "textToSpeechVoice": {
                                         "type": "string",
                                         "default": ""
diff --git a/ext/bg/js/audio-downloader.js b/ext/bg/js/audio-downloader.js
index 495b6399..62abda8f 100644
--- a/ext/bg/js/audio-downloader.js
+++ b/ext/bg/js/audio-downloader.js
@@ -16,6 +16,7 @@
  */
 
 /* global
+ * JsonSchemaValidator
  * NativeSimpleDOMParser
  * SimpleDOMParser
  */
@@ -24,6 +25,8 @@ class AudioDownloader {
     constructor({japaneseUtil, requestBuilder}) {
         this._japaneseUtil = japaneseUtil;
         this._requestBuilder = requestBuilder;
+        this._customAudioListSchema = null;
+        this._schemaValidator = null;
         this._getInfoHandlers = new Map([
             ['jpod101', this._getInfoJpod101.bind(this)],
             ['jpod101-alternate', this._getInfoJpod101Alternate.bind(this)],
@@ -183,13 +186,50 @@ class AudioDownloader {
         return [{type: 'tts', text: reading || expression, voice: textToSpeechVoice}];
     }
 
-    async _getInfoCustom(expression, reading, {customSourceUrl}) {
+    async _getInfoCustom(expression, reading, {customSourceUrl, customSourceType}) {
         if (typeof customSourceUrl !== 'string') {
             throw new Error('No custom URL defined');
         }
         const data = {expression, reading};
         const url = customSourceUrl.replace(/\{([^}]*)\}/g, (m0, m1) => (Object.prototype.hasOwnProperty.call(data, m1) ? `${data[m1]}` : m0));
-        return [{type: 'url', url}];
+
+        switch (customSourceType) {
+            case 'json':
+                return await this._getInfoCustomJson(url);
+            default:
+                return [{type: 'url', url}];
+        }
+    }
+
+    async _getInfoCustomJson(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();
+
+        const schema = await this._getCustomAudioListSchema();
+        if (this._schemaValidator === null) {
+            this._schemaValidator = new JsonSchemaValidator();
+        }
+        this._schemaValidator.validate(responseJson, schema);
+
+        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;
     }
 
     async _downloadAudioFromUrl(url, source) {
@@ -254,4 +294,22 @@ class AudioDownloader {
             throw new Error('DOM parsing not supported');
         }
     }
+
+    async _getCustomAudioListSchema() {
+        let schema = this._customAudioListSchema;
+        if (schema === null) {
+            const url = chrome.runtime.getURL('/bg/data/custom-audio-list-schema.json');
+            const response = await fetch(url, {
+                method: 'GET',
+                mode: 'no-cors',
+                cache: 'default',
+                credentials: 'omit',
+                redirect: 'follow',
+                referrerPolicy: 'no-referrer'
+            });
+            schema = await response.json();
+            this._customAudioListSchema = schema;
+        }
+        return schema;
+    }
 }
diff --git a/ext/bg/js/backend.js b/ext/bg/js/backend.js
index 2949cbed..60739aab 100644
--- a/ext/bg/js/backend.js
+++ b/ext/bg/js/backend.js
@@ -1581,7 +1581,7 @@ class Backend {
             throw new Error('Invalid reading and expression');
         }
 
-        const {sources, customSourceUrl} = details;
+        const {sources, customSourceUrl, customSourceType} = details;
         const data = await this._downloadDefinitionAudio(
             sources,
             expression,
@@ -1589,6 +1589,7 @@ class Backend {
             {
                 textToSpeechVoice: null,
                 customSourceUrl,
+                customSourceType,
                 binary: true,
                 disableCache: true
             }
diff --git a/ext/bg/js/options.js b/ext/bg/js/options.js
index 1690efb0..10919ae3 100644
--- a/ext/bg/js/options.js
+++ b/ext/bg/js/options.js
@@ -726,6 +726,7 @@ class OptionsUtil {
                 windowType: 'popup',
                 windowState: 'normal'
             };
+            profile.options.audio.customSourceType = 'audio';
         }
         return options;
     }
diff --git a/ext/bg/settings2.html b/ext/bg/settings2.html
index 62598352..448cc67d 100644
--- a/ext/bg/settings2.html
+++ b/ext/bg/settings2.html
@@ -2205,15 +2205,41 @@
                     </div>
                 </div>
                 <div class="settings-item-right">
-                    <input type="text" spellcheck="false" autocomplete="off" data-setting="audio.customSourceUrl" placeholder="None">
+                    <div class="settings-item-group">
+                        <div class="settings-item-group-item">
+                            <div class="settings-item-group-item-label">Type</div>
+                            <select class="short-width short-height" data-setting="audio.customSourceType">
+                                <option value="audio">Audio</option>
+                                <option value="json">JSON</option>
+                            </select>
+                        </div>
+                        <div class="settings-item-group-item">
+                            <div class="settings-item-group-item-label">URL</div>
+                            <input class="short-height" type="text" spellcheck="false" autocomplete="off" data-setting="audio.customSourceUrl" placeholder="None">
+                        </div>
+                    </div>
                 </div>
             </div>
             <div class="settings-item-children more" hidden>
                 <p>
-                    URL format used for fetching audio clips in <em>Custom</em> mode.
+                    The <em>URL</em> property specifies the URL format used for fetching audio clips in <em>Custom</em> mode.
                     The replacement tags <code data-select-on-click="">{expression}</code> and <code data-select-on-click="">{reading}</code> can be used to specify which
                     expression and reading is being looked up.<br>
-                    Example: <a data-select-on-click="">http://localhost/audio.mp3?expression={expression}&reading={reading}</a>
+                </p>
+                <p>
+                    The <em>Type</em> property specifies how the URL is handled when looking up audio:
+                </p>
+                <ul>
+                    <li>
+                        <strong>Audio</strong> - The link is treated as a direct link to an audio file that the browser can play.
+                    </li>
+                    <li>
+                        <strong>JSON</strong> - The link is interpreted as a link to a JSON file, which is downloaded and parsed for audio URLs.
+                        The format of the JSON file is specified in <a href="/bg/data/custom-audio-list-schema.json" target="_blank" rel="noopener noreferrer">this schema file</a>.
+                    </li>
+                </ul>
+                <p>
+                    Example URL: <a data-select-on-click="">http://localhost/audio.mp3?expression={expression}&reading={reading}</a>
                 </p>
                 <p>
                     <a class="more-toggle" data-parent-distance="3">Less&hellip;</a>