library.network.maui/Network/NetworkHelper.cs

namespace Blahblah.Library.Network;

public partial class NetworkHelper
{
    public const string AcceptAll = "*/*";
    public const string AcceptHttp = "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8";
    public const string AcceptImage = "image/webp,image/*,*/*;q=0.8";
    public const string AcceptJpegImage = "image/jpeg,image/*,*/*;q=0.8";
    public const string AcceptJson = "application/json";

    const string AcceptHeader = "Accept";
    const string ReferrerHeader = "Referer";

    const int Timeout = 30;
    const int ImageTimeout = 60;

    public static CancellationTokenSource TimeoutTokenSource => new(Timeout * 1000);
    public static CancellationTokenSource ImageTimeoutTokenSource => new(ImageTimeout * 1000);

    static string? proxyHost;
    static int? proxyPort;

    public static void SetProxy(string? host = null, int? port = null)
    {
        //bool changed = proxyHost != host || proxyPort != port;

        proxyHost = host;
        proxyPort = port;

        /*
        if (changed)
        {
            // TODO: background download
        }
        //*/
    }

    public static NetworkHelper CreateSession(int timeout = Timeout, bool useCookie = true, bool waitsConnectivity = true, Dictionary<string, string>? additionalHeaders = null)
    {
        var helper = new NetworkHelper(timeout, useCookie, waitsConnectivity, additionalHeaders);
        return helper;
    }

    public static NetworkHelper CreateImageSession(int timeout = ImageTimeout, bool useCookie = false, bool waitsConnectivity = false, Dictionary<string, string>? additionalHeaders = null)
    {
        return CreateSession(timeout, false, false, additionalHeaders);
    }

    public string? Accept { get; set; }
    public string? Referrer { get; set; }

    readonly object sync = new();

    public partial Task<NetworkResult<string>> GetContentAsync(string url, StringHandler? process = null, CancellationToken token = default);
}

public class HttpResponseException : Exception
{
    public int StatusCode { get; }

    public string Url { get; }

    public HttpResponseException(int code, string url) : base($"HTTP response failed with status code {code}, url: {url}")
    {
        StatusCode = code;
        Url = url;
    }
}