se-launcher/PluginLoader/Tools/SimpleHttpClient.cs

using System.Net;
using System.Text;
using LitJson;

namespace PluginLoader.Tools;

public static class SimpleHttpClient
{
    // REST API request timeout in milliseconds
    private const int TimeoutMs = 3000;

    public static TV Get<TV>(string url)
        where TV : class, new()
    {
        try
        {
            using var response = (HttpWebResponse)CreateRequest(HttpMethod.Get, url).GetResponse();

            using var responseStream = response.GetResponseStream();
            if (responseStream == null)
                return null;

            using var streamReader = new StreamReader(responseStream, Encoding.UTF8);
            return JsonMapper.ToObject<TV>(streamReader.ReadToEnd());
        }
        catch (WebException e)
        {
            LogFile.WriteGameLog($"REST API request failed: GET {url} [{e.Message}]");
            return null;
        }
    }

    public static TV Get<TV>(string url, Dictionary<string, string> parameters)
        where TV : class, new()
    {
        var uriBuilder = new StringBuilder(url);
        AppendQueryParameters(uriBuilder, parameters);
        var uri = uriBuilder.ToString();

        try
        {
            using var response = (HttpWebResponse)CreateRequest(HttpMethod.Get, uri).GetResponse();

            using var responseStream = response.GetResponseStream();
            if (responseStream == null)
                return null;

            using var streamReader = new StreamReader(responseStream, Encoding.UTF8);
            return JsonMapper.ToObject<TV>(streamReader.ReadToEnd());
        }
        catch (WebException e)
        {
            LogFile.WriteGameLog($"REST API request failed: GET {uri} [{e.Message}]");
            return null;
        }
    }

    public static TV Post<TV>(string url)
        where TV : class, new()
    {
        try
        {
            var request = CreateRequest(HttpMethod.Post, url);
            request.ContentLength = 0L;
            return PostRequest<TV>(request);
        }
        catch (WebException e)
        {
            LogFile.WriteGameLog($"REST API request failed: POST {url} [{e.Message}]");
            return null;
        }
    }

    public static TV Post<TV>(string url, Dictionary<string, string> parameters)
        where TV : class, new()
    {
        var uriBuilder = new StringBuilder(url);
        AppendQueryParameters(uriBuilder, parameters);
        var uri = uriBuilder.ToString();

        try
        {
            var request = CreateRequest(HttpMethod.Post, uri);
            request.ContentType = "application/x-www-form-urlencoded";
            request.ContentLength = 0;
            return PostRequest<TV>(request);
        }
        catch (WebException e)
        {
            LogFile.WriteGameLog($"REST API request failed: POST {uri} [{e.Message}]");
            return null;
        }
    }

    public static TV Post<TV, TR>(string url, TR body)
        where TR : class, new()
        where TV : class, new()
    {
        try
        {
            var request = CreateRequest(HttpMethod.Post, url);
            var requestJson = JsonMapper.ToJson(body);
            var requestBytes = Encoding.UTF8.GetBytes(requestJson);
            request.ContentType = "application/json";
            request.ContentLength = requestBytes.Length;
            return PostRequest<TV>(request, requestBytes);
        }
        catch (WebException e)
        {
            LogFile.WriteGameLog($"REST API request failed: POST {url} [{e.Message}]");
            return null;
        }
    }

    public static bool Post<TR>(string url, TR body)
        where TR : class, new()
    {
        try
        {
            var request = CreateRequest(HttpMethod.Post, url);
            var requestJson = JsonMapper.ToJson(body);
            var requestBytes = Encoding.UTF8.GetBytes(requestJson);
            request.ContentType = "application/json";
            request.ContentLength = requestBytes.Length;
            return PostRequest(request, requestBytes);
        }
        catch (WebException e)
        {
            LogFile.WriteGameLog($"REST API request failed: POST {url} [{e.Message}]");
            return false;
        }
    }

    private static TV PostRequest<TV>(HttpWebRequest request, byte[] body = null) where TV : class, new()
    {
        if (body != null)
        {
            using var requestStream = request.GetRequestStream();
            requestStream.Write(body, 0, body.Length);
            requestStream.Close();
        }

        using var response = (HttpWebResponse)request.GetResponse();
        using var responseStream = response.GetResponseStream();
        if (responseStream == null)
            return null;

        using var streamReader = new StreamReader(responseStream, Encoding.UTF8);
        var data = JsonMapper.ToObject<TV>(streamReader.ReadToEnd());
        return data;
    }

    private static bool PostRequest(HttpWebRequest request, byte[] body = null)
    {
        if (body != null)
        {
            using var requestStream = request.GetRequestStream();
            requestStream.Write(body, 0, body.Length);
            requestStream.Close();
        }

        using var response = (HttpWebResponse)request.GetResponse();

        return response.StatusCode == HttpStatusCode.OK;
    }

    private static HttpWebRequest CreateRequest(HttpMethod method, string url)
    {
        var http = WebRequest.CreateHttp(url);
        http.Method = method.ToString().ToUpper();
        http.Timeout = TimeoutMs;
        return http;
    }

    private static void AppendQueryParameters(StringBuilder stringBuilder, Dictionary<string, string> parameters)
    {
        if (parameters == null || parameters.Count == 0)
            return;

        var first = true;
        foreach (var p in parameters)
        {
            stringBuilder.Append(first ? '?' : '&');
            first = false;
            stringBuilder.Append(Uri.EscapeDataString(p.Key));
            stringBuilder.Append('=');
            stringBuilder.Append(Uri.EscapeDataString(p.Value));
        }
    }
}