Minor improvements

Jellyfin.Plugin.OpenSubtitles.sln

@@ -3,6 +3,10 @@ Microsoft Visual Studio Solution File, Format Version 12.00
 # Visual Studio 15
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Jellyfin.Plugin.OpenSubtitles", "Jellyfin.Plugin.OpenSubtitles\Jellyfin.Plugin.OpenSubtitles.csproj", "{DCD0C8B9-A493-4A66-B8EE-8748D430B660}"
 EndProject
+Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "tests", "tests", "{AF4DDF0B-B564-4925-B73D-C24A61923D42}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Jellyfin.Plugin.OpenSubtitles.Tests", "tests\Jellyfin.Plugin.OpenSubtitles.Tests\Jellyfin.Plugin.OpenSubtitles.Tests.csproj", "{C033E72D-81A7-4F3A-A097-9A3934657145}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -13,5 +17,12 @@ Global
 		{DCD0C8B9-A493-4A66-B8EE-8748D430B660}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{DCD0C8B9-A493-4A66-B8EE-8748D430B660}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{DCD0C8B9-A493-4A66-B8EE-8748D430B660}.Release|Any CPU.Build.0 = Release|Any CPU
+		{C033E72D-81A7-4F3A-A097-9A3934657145}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{C033E72D-81A7-4F3A-A097-9A3934657145}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{C033E72D-81A7-4F3A-A097-9A3934657145}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{C033E72D-81A7-4F3A-A097-9A3934657145}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(NestedProjects) = preSolution
+		{C033E72D-81A7-4F3A-A097-9A3934657145} = {AF4DDF0B-B564-4925-B73D-C24A61923D42}
 	EndGlobalSection
 EndGlobal

Jellyfin.Plugin.OpenSubtitles/OpenSubtitlesHandler/OpenSubtitles.cs

@@ -1,7 +1,6 @@
 using System;
 using System.Collections.Generic;
 using System.Globalization;
-using System.Linq;
 using System.Net.Http;
 using System.Threading;
 using System.Threading.Tasks;
@@ -127,7 +126,11 @@ namespace Jellyfin.Plugin.OpenSubtitles.OpenSubtitlesHandler
         /// <returns>The list of response data.</returns>
         public static async Task<ApiResponse<IReadOnlyList<ResponseData>>> SearchSubtitlesAsync(Dictionary<string, string> options, string apiKey, CancellationToken cancellationToken)
         {
-            var opts = System.Web.HttpUtility.ParseQueryString(string.Empty);
+            var opts = new Dictionary<string, string>();
+            foreach (var (key, value) in options)
+            {
+                opts.Add(key.ToLowerInvariant(), value.ToLowerInvariant());
+            }
 
             var max = -1;
             var current = 1;
@@ -138,23 +141,15 @@ namespace Jellyfin.Plugin.OpenSubtitles.OpenSubtitlesHandler
 
             do
             {
-                opts.Clear();
-
                 if (current > 1)
                 {
                     options["page"] = current.ToString(CultureInfo.InvariantCulture);
                 }
 
-                foreach (var (key, value) in options.OrderBy(x => x.Key))
+                var url = RequestHandler.AddQueryString("/subtitles", opts);
-                {
+                response = await RequestHandler.SendRequestAsync(url, HttpMethod.Get, null, null, apiKey, 1, cancellationToken).ConfigureAwait(false);
-                    opts.Add(key.ToLower(CultureInfo.InvariantCulture), value.ToLower(CultureInfo.InvariantCulture));
-                }
 
-                var qs = opts.ToString()!.Replace("%20", "+", StringComparison.Ordinal);
+                last = new ApiResponse<SearchResult>(response, $"url: {url}", $"page: {current}");
-
-                response = await RequestHandler.SendRequestAsync($"/subtitles?{qs}", HttpMethod.Get, null, null, apiKey, 1, cancellationToken).ConfigureAwait(false);
-
-                last = new ApiResponse<SearchResult>(response, $"query: {qs}", $"page: {current}");
 
                 if (!last.Ok || last.Data == null)
                 {

Jellyfin.Plugin.OpenSubtitles/OpenSubtitlesHandler/OpenSubtitlesRequestHelper.cs

@@ -1,13 +1,12 @@
 using System;
+using System.Buffers.Binary;
 using System.Collections.Generic;
 using System.IO;
 using System.Linq;
 using System.Net;
 using System.Net.Http;
 using System.Net.Http.Headers;
-using System.Net.Mime;
+using System.Net.Http.Json;
-using System.Text;
-using System.Text.Json;
 using System.Threading;
 using System.Threading.Tasks;
 
@@ -38,45 +37,32 @@ namespace Jellyfin.Plugin.OpenSubtitles.OpenSubtitlesHandler
         public static OpenSubtitlesRequestHelper? Instance { get; set; }
 
         /// <summary>
-        /// Compute movie hash.
+        /// Calculates: size + 64bit chksum of the first and last 64k (even if they overlap because the file is smaller than 128k).
         /// </summary>
-        /// <param name="stream">The input stream.</param>
+        /// <param name="input">The input stream.</param>
         /// <returns>The hash as Hexadecimal string.</returns>
-        public static string ComputeHash(Stream stream)
+        public static string ComputeHash(Stream input)
         {
-            var hash = ComputeMovieHash(stream);
+            const int HashLength = 8; // 64 bit hash
-            return Convert.ToHexString(hash).ToLowerInvariant();
+            const long HashPos = 64 * 1024; // 64k
-        }
 
-        /// <summary>
+            long streamsize = input.Length;
-        /// Compute hash of specified movie stream.
+            ulong hash = (ulong)streamsize;
-        /// </summary>
+
-        /// <returns>Hash of the movie.</returns>
+            Span<byte> buffer = stackalloc byte[HashLength];
-        private static byte[] ComputeMovieHash(Stream input)
+            while (input.Position < HashPos && input.Read(buffer) > 0)
-        {
-            using (input)
             {
-                long streamSize = input.Length, lHash = streamSize;
+                hash += BinaryPrimitives.ReadUInt64LittleEndian(buffer);
-                int size = sizeof(long), count = 65536 / size;
-                var buffer = new byte[size];
-
-                for (int i = 0; i < count && input.Read(buffer, 0, size) > 0; i++)
-                {
-                    lHash += BitConverter.ToInt64(buffer, 0);
-                }
-
-                input.Position = Math.Max(0, streamSize - 65536);
-
-                for (int i = 0; i < count && input.Read(buffer, 0, size) > 0; i++)
-                {
-                    lHash += BitConverter.ToInt64(buffer, 0);
-                }
-
-                var result = BitConverter.GetBytes(lHash);
-                Array.Reverse(result);
-
-                return result;
             }
+
+            input.Seek(-HashPos, SeekOrigin.End);
+            while (input.Read(buffer) > 0)
+            {
+                hash += BinaryPrimitives.ReadUInt64LittleEndian(buffer);
+            }
+
+            BinaryPrimitives.WriteUInt64BigEndian(buffer, hash);
+            return Convert.ToHexString(buffer).ToLowerInvariant();
         }
 
         internal async Task<(string body, Dictionary<string, string> headers, HttpStatusCode statusCode)> SendRequestAsync(
@@ -91,7 +77,7 @@ namespace Jellyfin.Plugin.OpenSubtitles.OpenSubtitlesHandler
             HttpContent? content = null;
             if (method != HttpMethod.Get && body != null)
             {
-                content = new StringContent(JsonSerializer.Serialize(body), Encoding.UTF8, MediaTypeNames.Application.Json);
+                content = JsonContent.Create(body);
             }
 
             using var request = new HttpRequestMessage

Jellyfin.Plugin.OpenSubtitles/OpenSubtitlesHandler/RequestHandler.cs

@@ -1,9 +1,12 @@
 using System;
 using System.Collections.Generic;
+using System.Linq;
 using System.Net;
 using System.Net.Http;
+using System.Text;
 using System.Threading;
 using System.Threading.Tasks;
+using System.Web;
 using Jellyfin.Plugin.OpenSubtitles.OpenSubtitlesHandler.Models;
 
 namespace Jellyfin.Plugin.OpenSubtitles.OpenSubtitlesHandler
@@ -121,5 +124,32 @@ namespace Jellyfin.Plugin.OpenSubtitles.OpenSubtitlesHandler
                 Reason = value
             };
         }
+
+        /// <summary>
+        /// Append the given query keys and values to the URI.
+        /// </summary>
+        /// <param name="path">The base URI.</param>
+        /// <param name="param">A dictionary of query keys and values to append.</param>
+        /// <returns>The combined result.</returns>
+        public static string AddQueryString(string path, Dictionary<string, string> param)
+        {
+            if (param.Count == 0)
+            {
+                return path;
+            }
+
+            var url = new StringBuilder(path);
+            url.Append('?');
+            foreach (var (key, value) in param.OrderBy(x => x.Key))
+            {
+                url.Append(HttpUtility.UrlEncode(key))
+                    .Append('=')
+                    .Append(HttpUtility.UrlEncode(value))
+                    .Append('&');
+            }
+
+            url.Length -= 1; // Remove last &
+            return url.ToString();
+        }
     }
 }

tests/Jellyfin.Plugin.OpenSubtitles.Tests/Jellyfin.Plugin.OpenSubtitles.Tests.csproj

@@ -0,0 +1,32 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net6.0</TargetFramework>
+    <Nullable>enable</Nullable>
+    <IsPackable>false</IsPackable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.11.0" />
+    <PackageReference Include="xunit" Version="2.4.1" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.4.3">
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+      <PrivateAssets>all</PrivateAssets>
+    </PackageReference>
+    <PackageReference Include="coverlet.collector" Version="3.1.0">
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+      <PrivateAssets>all</PrivateAssets>
+    </PackageReference>
+  </ItemGroup>
+
+  <ItemGroup>
+    <None Include="Test Data\**\*.*">
+      <CopyToOutputDirectory>Always</CopyToOutputDirectory>
+    </None>
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="../../Jellyfin.Plugin.OpenSubtitles/Jellyfin.Plugin.OpenSubtitles.csproj" />
+  </ItemGroup>
+
+</Project>

tests/Jellyfin.Plugin.OpenSubtitles.Tests/OpenSubtitlesHandler/OpenSubtitlesRequestHelperTests.cs

@@ -0,0 +1,15 @@
+using System.IO;
+using Xunit;
+
+namespace Jellyfin.Plugin.OpenSubtitles.OpenSubtitlesHandler.Tests;
+
+public class OpenSubtitlesRequestHelperTests
+{
+    [Theory]
+    [InlineData("breakdance.avi", "8e245d9679d31e12")]
+    public void ComputeHash_Success(string filename, string hash)
+    {
+        using var str = File.OpenRead(Path.Join("Test Data", filename));
+        Assert.Equal(hash, OpenSubtitlesRequestHelper.ComputeHash(str));
+    }
+}

tests/Jellyfin.Plugin.OpenSubtitles.Tests/OpenSubtitlesHandler/RequestHandlerTests.cs

@@ -0,0 +1,26 @@
+using System.Collections.Generic;
+using Xunit;
+
+namespace Jellyfin.Plugin.OpenSubtitles.OpenSubtitlesHandler.Tests;
+
+public static class RequestHandlerTests
+{
+    public static TheoryData<string, Dictionary<string, string>, string> ComputeHash_Success_TestData()
+        => new TheoryData<string, Dictionary<string, string>, string>
+        {
+            {
+                "/subtitles",
+                new Dictionary<string, string>()
+                {
+                    { "b", "c and d" },
+                    { "a", "1" }
+                },
+                "/subtitles?a=1&b=c+and+d"
+            }
+        };
+
+    [Theory]
+    [MemberData(nameof(ComputeHash_Success_TestData))]
+    public static void ComputeHash_Success(string path, Dictionary<string, string> param, string expected)
+        => Assert.Equal(expected, RequestHandler.AddQueryString(path, param));
+}