Add API

API/MangaDownloadClients/HttpDownloadClient.cs

@@ -0,0 +1,73 @@
+using System.Net;
+using API.Schema;
+using HtmlAgilityPack;
+
+namespace API.MangaDownloadClients;
+
+internal class HttpDownloadClient : DownloadClient
+{
+    private static readonly HttpClient Client = new()
+    {
+        Timeout = TimeSpan.FromSeconds(10)
+    };
+
+    public HttpDownloadClient()
+    {
+        Client.DefaultRequestHeaders.TryAddWithoutValidation("User-Agent", TrangaSettings.userAgent);
+    }
+    
+    internal override RequestResult MakeRequestInternal(string url, string? referrer = null, string? clickButton = null)
+    {
+        //TODO
+        //if (clickButton is not null)
+            //Log("Can not click button on static site.");
+        HttpResponseMessage? response = null;
+        while (response is null)
+        {
+            HttpRequestMessage requestMessage = new(HttpMethod.Get, url);
+            if (referrer is not null)
+                requestMessage.Headers.Referrer = new Uri(referrer);
+            //Log($"Requesting {requestType} {url}");
+            try
+            {
+                response = Client.Send(requestMessage);
+            }
+            catch (Exception e)
+            {
+                switch (e)
+                {
+                    case TaskCanceledException:
+                        return new RequestResult(HttpStatusCode.RequestTimeout, null, Stream.Null);
+                    case HttpRequestException:
+                        return new RequestResult(HttpStatusCode.BadRequest, null, Stream.Null);
+                }
+            }
+        }
+
+        if (!response.IsSuccessStatusCode)
+        {
+            return new RequestResult(response.StatusCode,  null, Stream.Null);
+        }
+        
+        Stream stream = response.Content.ReadAsStream();
+
+        HtmlDocument? document = null;
+
+        if (response.Content.Headers.ContentType?.MediaType == "text/html")
+        {
+            StreamReader reader = new (stream);
+            document = new ();
+            document.LoadHtml(reader.ReadToEnd());
+            stream.Position = 0;
+        }
+
+        // Request has been redirected to another page. For example, it redirects directly to the results when there is only 1 result
+        if (response.RequestMessage is not null && response.RequestMessage.RequestUri is not null)
+        {
+            return new RequestResult(response.StatusCode, document, stream, true,
+                response.RequestMessage.RequestUri.AbsoluteUri);
+        }
+
+        return new RequestResult(response.StatusCode, document, stream);
+    }
+}