api: add support for newgrounds

closes #620, replaces #1368
Co-authored-by: hyperdefined <contact@hyper.lol>

api/src/processing/services/newgrounds.js

@@ -0,0 +1,103 @@
+import { genericUserAgent } from "../../config.js";
+
+const getVideo = async ({ id, quality }) => {
+    const json = await fetch(`https://www.newgrounds.com/portal/video/${id}`, {
+        headers: {
+            "User-Agent": genericUserAgent,
+            "X-Requested-With": "XMLHttpRequest", // required to get the JSON response
+        }
+    })
+    .then(r => r.json())
+    .catch(() => {});
+
+    if (!json) return { error: "fetch.empty" };
+
+    const videoSources = json.sources;
+    const videoQualities = Object.keys(videoSources);
+
+    if (videoQualities.length === 0) {
+        return { error: "fetch.empty" };
+    }
+
+    const bestVideo = videoSources[videoQualities[0]]?.[0],
+          userQuality = quality === "2160" ? "4k" : `${quality}p`,
+          preferredVideo = videoSources[userQuality]?.[0],
+          video = preferredVideo || bestVideo,
+          videoQuality = preferredVideo ? userQuality : videoQualities[0];
+
+    if (!bestVideo || !video.type.includes("mp4")) {
+        return { error: "fetch.empty" };
+    }
+
+    const fileMetadata = {
+        title: decodeURIComponent(json.title),
+        artist: decodeURIComponent(json.author),
+    }
+
+    return {
+        urls: video.src,
+        filenameAttributes: {
+            service: "newgrounds",
+            id,
+            title: fileMetadata.title,
+            author: fileMetadata.artist,
+            extension: "mp4",
+            qualityLabel: videoQuality,
+            resolution: videoQuality,
+        },
+        fileMetadata,
+    }
+}
+
+const getMusic = async ({ id }) => {
+    const html = await fetch(`https://www.newgrounds.com/audio/listen/${id}`, {
+        headers: {
+            "User-Agent": genericUserAgent,
+        }
+    })
+    .then(r => r.text())
+    .catch(() => {});
+
+    if (!html) return { error: "fetch.fail" };
+
+    const params = JSON.parse(
+        `{${html.split(',"params":{')[1]?.split(',"images":')[0]}}`
+    );
+    if (!params) return { error: "fetch.empty" };
+
+    if (!params.name || !params.artist || !params.filename || !params.icon) {
+        return { error: "fetch.empty" };
+    }
+
+    const fileMetadata = {
+        title: decodeURIComponent(params.name),
+        artist: decodeURIComponent(params.artist),
+    }
+
+    return {
+        urls: params.filename,
+        filenameAttributes: {
+            service: "newgrounds",
+            id,
+            title: fileMetadata.title,
+            author: fileMetadata.artist,
+        },
+        fileMetadata,
+        cover:
+            params.icon.includes(".png?") || params.icon.includes(".jpg?")
+                ? params.icon
+                : undefined,
+        isAudioOnly: true,
+        bestAudio: "mp3",
+    }
+}
+
+export default function({ id, audioId, quality }) {
+    if (id) {
+        return getVideo({ id, quality });
+    } else if (audioId) {
+        return getMusic({ id: audioId });
+    }
+
+    return { error: "fetch.empty" };
+}