YouTube-Manager/Manager.YouTube/NetworkService.cs

using DotBased.Monads;
using Manager.YouTube.Util;

namespace Manager.YouTube;

public static class NetworkService
{
    public const string Origin = "https://www.youtube.com";
    private static readonly HttpClient HttpClient = new HttpClient();

    public static async Task<Result<string>> MakeRequestAsync(HttpRequestMessage request, YouTubeClient client, bool skipAuthenticationHeader = false)
    {
        request.Headers.Add("Origin", Origin);
        request.Headers.UserAgent.ParseAdd(client.UserAgent);
        if (client.SapisidCookie != null && !skipAuthenticationHeader)
        {
            request.Headers.Authorization = AuthenticationUtilities.GetSapisidHashHeader(client.GetDatasyncId(), client.SapisidCookie.Value, Origin);
        }

        try
        {
            var response = await client.HttpClient.SendAsync(request);
            var contentString = await response.Content.ReadAsStringAsync();
            if (!response.IsSuccessStatusCode)
            {
                return ResultError.Fail(contentString);
            }
            return contentString;
        }
        catch (Exception e)
        {
            return ResultError.Error(e);
        }
    }

    public static async Task<Result<DownloadResult>> DownloadBytesAsync(HttpRequestMessage request, YouTubeClient? client = null)
    {
        try
        {
            var response = client != null ? await client.HttpClient.SendAsync(request) : await HttpClient.SendAsync(request);
            if (!response.IsSuccessStatusCode)
            {
                return ResultError.Fail($"Failed to get file to download, response code: {response.StatusCode}.");
            }
            
            var data = await response.Content.ReadAsByteArrayAsync();;
            
            return new DownloadResult(data, response.Content.Headers.ContentType?.MediaType, response.Content.Headers.ContentDisposition?.FileName?.Trim('"'), response.Content.Headers.ContentLength ?? 0);
        }
        catch (Exception e)
        {
            return ResultError.Error(e);
        }
    }
}

public record DownloadResult(byte[] Data, string? ContentType, string? FileName, long ContentLength);