Fix FlareSolverr, Flaresolverrsharp is broken

API/MangaDownloadClients/FlareSolverrDownloadClient.cs

@@ -0,0 +1,180 @@
+using System.Diagnostics.CodeAnalysis;
+using System.Net;
+using System.Net.Http.Headers;
+using System.Text;
+using HtmlAgilityPack;
+using Newtonsoft.Json;
+using Newtonsoft.Json.Linq;
+
+namespace API.MangaDownloadClients;
+
+public class FlareSolverrDownloadClient : DownloadClient
+{
+    
+    
+    internal override RequestResult MakeRequestInternal(string url, string? referrer = null, string? clickButton = null)
+    {
+        if (clickButton is not null)
+            Log.Warn("Client can not click button");
+        if(referrer is not null)
+            Log.Warn("Client can not set referrer");
+        if (TrangaSettings.flareSolverrUrl == string.Empty)
+        {
+            Log.Error("FlareSolverr URL is empty");
+            return new(HttpStatusCode.InternalServerError, null, Stream.Null);
+        }
+        
+        Uri flareSolverrUri = new (TrangaSettings.flareSolverrUrl);
+        if (flareSolverrUri.Segments.Last() != "v1")
+            flareSolverrUri = new UriBuilder(flareSolverrUri)
+            {
+                Path = "v1"
+            }.Uri;
+        
+        HttpClient client = new()
+        {
+            Timeout = TimeSpan.FromSeconds(10),
+            DefaultVersionPolicy = HttpVersionPolicy.RequestVersionOrHigher,
+            DefaultRequestHeaders = { { "User-Agent", TrangaSettings.userAgent } }
+        };
+
+        JObject requestObj = new()
+        {
+            ["cmd"] = "request.get",
+            ["url"] = url
+        };
+
+        HttpRequestMessage requestMessage = new(HttpMethod.Post, flareSolverrUri)
+        {
+            Content = new StringContent(JsonConvert.SerializeObject(requestObj)),
+        };
+        requestMessage.Content.Headers.ContentType = new ("application/json");
+        Log.Debug($"Requesting {url}");
+        
+        HttpResponseMessage? response;
+        try
+        {
+            response = client.Send(requestMessage);
+        }
+        catch (HttpRequestException e)
+        {
+            Log.Error(e);
+            return new (HttpStatusCode.Unused, null, Stream.Null);
+        }
+
+        if (!response.IsSuccessStatusCode)
+        {
+            Log.Debug($"Request returned status code {(int)response.StatusCode} {response.StatusCode}:\n" +
+                      $"=====\n" +
+                      $"Request:\n" +
+                      $"{requestMessage.Method} {requestMessage.RequestUri}\n" +
+                      $"{requestMessage.Version} {requestMessage.VersionPolicy}\n" +
+                      $"Headers:\n\t{string.Join("\n\t", requestMessage.Headers.Select(h => $"{h.Key}: <{string.Join(">, <", h.Value)}"))}>\n" +
+                      $"{requestMessage.Content?.ReadAsStringAsync().Result}" +
+                      $"=====\n" +
+                      $"Response:\n" +
+                      $"{response.Version}\n" +
+                      $"Headers:\n\t{string.Join("\n\t", response.Headers.Select(h => $"{h.Key}: <{string.Join(">, <", h.Value)}"))}>\n" +
+                      $"{response.Content.ReadAsStringAsync().Result}");
+            return new (response.StatusCode,  null, Stream.Null);
+        }
+
+        string responseString = response.Content.ReadAsStringAsync().Result;
+        JObject responseObj = JObject.Parse(responseString);
+        if (!IsInCorrectFormat(responseObj, out string? reason))
+        {
+            Log.Error($"Wrong format: {reason}");
+            return new(HttpStatusCode.Unused, null, Stream.Null);
+        }
+
+        string statusResponse = responseObj["status"]!.Value<string>()!;
+        if (statusResponse != "ok")
+        {
+            Log.Debug($"Status is not ok: {statusResponse}");
+            return new(HttpStatusCode.Unused, null, Stream.Null);
+        }
+        JObject solution = (responseObj["solution"] as JObject)!;
+
+        if (!Enum.TryParse(solution["status"]!.Value<int>().ToString(), out HttpStatusCode statusCode))
+        {
+            Log.Error($"Wrong format: Cant parse status code: {solution["status"]!.Value<int>()}");
+            return new(HttpStatusCode.Unused, null, Stream.Null);
+        }
+        if (statusCode < HttpStatusCode.OK || statusCode >= HttpStatusCode.MultipleChoices)
+        {
+            Log.Debug($"Status is: {statusCode}");
+            return new(statusCode, null, Stream.Null);
+        }
+
+        if (solution["response"]!.Value<string>() is not { } htmlString)
+        {
+            Log.Error("Wrong format: Cant find response in solution");
+            return new(HttpStatusCode.Unused, null, Stream.Null);
+        }
+
+        if (IsJson(htmlString, out HtmlDocument document, out string? json))
+        {
+            MemoryStream ms = new();
+            ms.Write(Encoding.UTF8.GetBytes(json));
+            ms.Position = 0;
+            return new(statusCode, document, ms);
+        }
+        else
+        {
+            MemoryStream ms = new();
+            ms.Write(Encoding.UTF8.GetBytes(htmlString));
+            ms.Position = 0;
+            return new(statusCode, document, ms);
+        }
+    }
+
+    private bool IsInCorrectFormat(JObject responseObj, [NotNullWhen(false)]out string? reason)
+    {
+        reason = null;
+        if (!responseObj.ContainsKey("status"))
+        {
+            reason = "Cant find status on response";
+            return false;
+        }
+
+        if (responseObj["solution"] is not JObject solution)
+        {
+            reason = "Cant find solution";
+            return false;
+        }
+
+        if (!solution.ContainsKey("status"))
+        {
+            reason = "Wrong format: Cant find status in solution";
+            return false;
+        }
+
+        if (!solution.ContainsKey("response"))
+        {
+
+            reason = "Wrong format: Cant find response in solution";
+            return false;
+        }
+
+        return true;
+    }
+
+    private bool IsJson(string htmlString, out HtmlDocument document, [NotNullWhen(true)]out string? jsonString)
+    {
+        jsonString = null;
+        document = new();
+        document.LoadHtml(htmlString);
+
+        HtmlNode pre = document.DocumentNode.SelectSingleNode("//pre");
+        try
+        {
+            JObject.Parse(pre.InnerText);
+            jsonString = pre.InnerText;
+            return true;
+        }
+        catch (JsonReaderException)
+        {
+            return false;
+        }
+    }
+}