NekoMelody/src/utils/Request.ts

import axios, { AxiosRequestConfig, AxiosResponse } from "axios";

export async function makeStreamRequest(
    url: string,
    options: AxiosRequestConfig = {},
    body?: any,
): Promise<AxiosResponse> {
    const { headers = {}, method = "GET" } = options;

    let config: AxiosRequestConfig = {
        url,
        method,
        headers,
        data: body,
        responseType: "stream",
    };

    // Override / Add config
    config = Object.assign(config, options);

    try {
        const response = await axios(config);
        return response;
    } catch (err) {
        throw err;
    }
}

export async function getStream(
    url: string,
    options: AxiosRequestConfig = { method: "GET" },
): Promise<AxiosResponse<any, any>> {
    try {
        let response = await makeStreamRequest(url, options);
        const visitedUrls = new Set<string>();

        // Handle redirection and detect redirection loop
        while (
            response.status >= 300 &&
            response.status < 400 &&
            response.headers.location
        ) {
            const redirectUrl = response.headers.location;
            if (visitedUrls.has(redirectUrl)) {
                throw new Error("Redirection loop detected");
            }
            visitedUrls.add(redirectUrl);
            response = await makeStreamRequest(redirectUrl, options);
        }

        return response;
    } catch (error) {
        throw error;
    }
}

export async function getYouTubeFormats(id: string) {
    const new_url = `https://www.youtube.com/watch?v=${id}&has_verified=1`;
    const response = await axios.get(new_url, {
        headers: { "accept-language": "en-US,en;q=0.9" },
        withCredentials: true,
    });
    const body = response.data;

    const match = body.match(
        /var ytInitialPlayerResponse = (.*?)(?=;\s*<\/script>)/,
    );
    const data = match ? match[1] : null;
    if (!data) throw new Error("Failed to get YouTube formats");

    try {
        let formats = JSON.parse(data).streamingData.adaptiveFormats;
        if (!formats) throw new Error("Failed to parse YouTube formats");

        // Filters only audio formats that are webm
        formats = formats.filter((format: any) =>
            format.mimeType.startsWith("audio/webm;"),
        );

        // Sort the quality of the formats
        formats = formats.sort((a: any, b: any) => {
            const aQuality = a.audioQuality === "AUDIO_QUALITY_MEDIUM" ? 0 : 1;
            const bQuality = b.audioQuality === "AUDIO_QUALITY_MEDIUM" ? 0 : 1;
            return aQuality - bQuality;
        });

        return formats;
    } catch (err) {
        throw new Error("Failed to parse YouTube formats");
    }
}