add innerTube API, types and tests

src/types/innerTubeApi.model.ts

@@ -0,0 +1,23 @@
+export interface innerTubeVideoDetails {
+    "videoId": string,
+    "title": string,
+    "lengthSeconds": string, // yes, don't ask.
+    "channelId": string,
+    "isOwnerViewing": boolean,
+    "shortDescription": string,
+    "isCrawlable": boolean,
+    "thumbnail": {
+        "thumbnails": [{
+                "url": string,
+                "width": number,
+                "height": number
+            }
+        ]
+    },
+    "allowRatings": boolean,
+    "viewCount": string, // yes, don't ask
+    "author": string,
+    "isPrivate": boolean,
+    "isUnpluggedCorpus": boolean,
+    "isLiveContent": boolean
+}

src/utils/innerTubeAPI.ts

@@ -0,0 +1,29 @@
+import axios from "axios";
+import { innerTubeVideoDetails } from "../types/innerTubeApi.model";
+
+export async function getPlayerData(videoID: string): Promise<innerTubeVideoDetails> {
+    // start subrequest
+    const url = "https://www.youtube.com/youtubei/v1/player";
+    const data = {
+        context: {
+            client: {
+                clientName: "WEB",
+                clientVersion: "2.20211129.09.00"
+            }
+        },
+        videoId: videoID
+    };
+    const result = await axios.post(url, data, {
+        timeout: 3500
+    });
+    if (result.status === 200) {
+        return result.data.videoDetails;
+    } else {
+        return Promise.reject(result.status);
+    }
+}
+
+export const getLength = (videoID: string): Promise<number> =>
+    getPlayerData(videoID)
+        .then(pData => Number(pData.lengthSeconds))
+        .catch(err => err);