fix(json): serialize podcast durations as numeric seconds

Affected files:
- lib/views/json.test.ts
- lib/views/json.ts

lib/views/json.test.ts

@@ -3,6 +3,33 @@ import { describe, expect, it } from 'vitest';
 import jsonView from '@/views/json';
 
 describe('JSON view', () => {
+    it.each([
+        [65, 65],
+        ['65', 65],
+        ['0:01:05', 65],
+        ['01:02:03', 3723],
+        ['90:00', 5400],
+        ['0:00:01.5', 1.5],
+        [0, 0],
+        ['invalid', undefined],
+        ['0:99:00', undefined],
+        [-1, undefined],
+        [Infinity, undefined],
+    ])('serializes podcast duration %s as numeric seconds', (duration, seconds) => {
+        const feed = JSON.parse(
+            jsonView({
+                title: 'Podcast',
+                item: [{ title: 'Episode', enclosure_url: 'https://example.com/audio.mp3', enclosure_type: 'audio/mpeg', itunes_duration: duration }],
+            })
+        );
+        const attachment = feed.items[0].attachments[0];
+        if (seconds === undefined) {
+            expect(attachment).not.toHaveProperty('duration_in_seconds');
+        } else {
+            expect(attachment.duration_in_seconds).toBe(seconds);
+        }
+    });
+
     it('renders summary, authors, tags, attachments, and extras', () => {
         const jsonOutput = jsonView({
             title: 'JSON Feed',

lib/views/json.ts

@@ -1,4 +1,22 @@
-import type { Data } from '@/types';
+import type { Data, DataItem } from '@/types';
+
+const toDurationInSeconds = (duration: DataItem['itunes_duration']) => {
+    if (typeof duration === 'number') {
+        return Number.isFinite(duration) && duration >= 0 ? duration : undefined;
+    }
+    if (typeof duration !== 'string') {
+        return;
+    }
+    if (/^\d+(?:\.\d+)?$/.test(duration)) {
+        const seconds = Number(duration);
+        return Number.isFinite(seconds) ? seconds : undefined;
+    }
+    if (!/^\d+:(?:[0-5]?\d:)?[0-5]?\d(?:\.\d+)?$/.test(duration)) {
+        return;
+    }
+    const seconds = duration.split(':').reduce((total, part) => total * 60 + Number(part), 0);
+    return Number.isFinite(seconds) ? seconds : undefined;
+};
 
 /**
  * This function should be used by RSSHub middleware only.
@@ -39,7 +57,7 @@ const json = (data: Data) => {
                               mime_type: item.enclosure_type,
                               title: item.enclosure_title,
                               size_in_bytes: item.enclosure_length,
-                              duration_in_seconds: item.itunes_duration,
+                              duration_in_seconds: toDurationInSeconds(item.itunes_duration),
                           },
                       ]
                     : undefined),