api: flatten code directories, better filenames, remove old files

api/src/processing/services/vk.js

@@ -0,0 +1,55 @@
+import { genericUserAgent, env } from "../../config.js";
+import { cleanString } from "../../misc/utils.js";
+
+const resolutions = ["2160", "1440", "1080", "720", "480", "360", "240"];
+
+export default async function(o) {
+    let html, url, quality = o.quality === "max" ? 2160 : o.quality;
+
+    html = await fetch(`https://vk.com/video${o.userId}_${o.videoId}`, {
+        headers: { "user-agent": genericUserAgent }
+    }).then(r => r.arrayBuffer()).catch(() => {});
+
+    if (!html) return { error: 'ErrorCouldntFetch' };
+
+    // decode cyrillic from windows-1251 because vk still uses apis from prehistoric times
+    let decoder = new TextDecoder('windows-1251');
+    html = decoder.decode(html);
+
+    if (!html.includes(`{"lang":`)) return { error: 'ErrorEmptyDownload' };
+
+    let js = JSON.parse('{"lang":' + html.split(`{"lang":`)[1].split(']);')[0]);
+
+    if (Number(js.mvData.is_active_live) !== 0) return { error: 'ErrorLiveVideo' };
+    if (js.mvData.duration > env.durationLimit)
+        return { error: ['ErrorLengthLimit', env.durationLimit / 60] };
+
+    for (let i in resolutions) {
+        if (js.player.params[0][`url${resolutions[i]}`]) {
+            quality = resolutions[i];
+            break
+        }
+    }
+    if (Number(quality) > Number(o.quality)) quality = o.quality;
+
+    url = js.player.params[0][`url${quality}`];
+
+    let fileMetadata = {
+        title: cleanString(js.player.params[0].md_title.trim()),
+        author: cleanString(js.player.params[0].md_author.trim()),
+    }
+
+    if (url) return {
+        urls: url,
+        filenameAttributes: {
+            service: "vk",
+            id: `${o.userId}_${o.videoId}`,
+            title: fileMetadata.title,
+            author: fileMetadata.author,
+            resolution: `${quality}p`,
+            qualityLabel: `${quality}p`,
+            extension: "mp4"
+        }
+    }
+    return { error: 'ErrorEmptyDownload' }
+}