Add API

API/MangaDownloadClients/DownloadClient.cs

@@ -0,0 +1,42 @@
+using System.Net;
+using API.Schema;
+
+namespace API.MangaDownloadClients;
+
+internal abstract class DownloadClient
+{
+    private readonly Dictionary<RequestType, DateTime> _lastExecutedRateLimit;
+
+    protected DownloadClient()
+    {
+        this._lastExecutedRateLimit = new();
+    }
+    
+    public RequestResult MakeRequest(string url, RequestType requestType, string? referrer = null, string? clickButton = null)
+    {
+        if (!TrangaSettings.requestLimits.ContainsKey(requestType))
+        {
+            return new RequestResult(HttpStatusCode.NotAcceptable, null, Stream.Null);
+        }
+
+        int rateLimit = TrangaSettings.userAgent == TrangaSettings.DefaultUserAgent
+            ? TrangaSettings.DefaultRequestLimits[requestType]
+            : TrangaSettings.requestLimits[requestType];
+        
+        TimeSpan timeBetweenRequests = TimeSpan.FromMinutes(1).Divide(rateLimit);
+        _lastExecutedRateLimit.TryAdd(requestType, DateTime.Now.Subtract(timeBetweenRequests));
+
+        TimeSpan rateLimitTimeout = timeBetweenRequests.Subtract(DateTime.Now.Subtract(_lastExecutedRateLimit[requestType]));
+
+        if (rateLimitTimeout > TimeSpan.Zero)
+        {
+            Thread.Sleep(rateLimitTimeout);
+        }
+
+        RequestResult result = MakeRequestInternal(url, referrer, clickButton);
+        _lastExecutedRateLimit[requestType] = DateTime.Now;
+        return result;
+    }
+
+    internal abstract RequestResult MakeRequestInternal(string url, string? referrer = null, string? clickButton = null);
+}