Adjust FFmpeg mirror list URL to support relative path

Author: neon-nyan

CollapseLauncher/Classes/Helper/FFmpegCodecInstaller.cs

@@ -2,10 +2,14 @@
 using CollapseLauncher.GameManagement.ImageBackground;
 using CollapseLauncher.Helper.StreamUtility;
 using CollapseLauncher.Interfaces;
+using Hi3Helper.Data;
 using Hi3Helper.EncTool;
 using Hi3Helper.Http;
+using Hi3Helper.Shared.Region;
 using System;
+using System.Collections.Generic;
 using System.IO;
+using System.Linq;
 using System.Net.Http;
 using System.Text.Json.Serialization;
 using System.Threading;
@@ -141,7 +145,7 @@ private static async Task<string[]> GetMirrorList(CancellationToken token)
 
     private async Task<UrlStatus> FindAvailableMirrors(HttpClient client, params string[] urls)
     {
-        foreach (string url in urls)
+        foreach (string url in urls.SelectMany(SelectManyUrlFromCdnMirrors))
         {
             Status.ActivityAll = $"Checking Mirror URL: {url}...";
 
@@ -154,4 +158,23 @@ private async Task<UrlStatus> FindAvailableMirrors(HttpClient client, params str
 
         throw new HttpRequestException("No available mirrors are reachable!");
     }
+
+    private static IEnumerable<string> SelectManyUrlFromCdnMirrors(string url)
+    {
+        if (Uri.TryCreate(url, UriKind.Absolute, out _))
+        {
+            yield return url;
+            yield break;
+        }
+
+        CDNURLProperty preferredCdn = FallbackCDNUtil.GetPreferredCDN();
+        yield return preferredCdn.URLPrefix.CombineURLFromString(url);
+
+        foreach (CDNURLProperty otherCdn in FallbackCDNUtil
+                                           .CDNList
+                                           .Where(x => x != preferredCdn))
+        {
+            yield return otherCdn.URLPrefix.CombineURLFromString(url);
+        }
+    }
 }

Hi3Helper.Core/Classes/Shared/Region/LauncherConfig.cs

@@ -23,10 +23,30 @@ namespace Hi3Helper.Shared.Region
         public string Description            { get; init; }
         public bool   PartialDownloadSupport { get; init; }
 
-        public bool Equals(CDNURLProperty other)
-        {
-            return URLPrefix == other.URLPrefix && Name == other.Name && Description == other.Description;
-        }
+        public bool Equals(CDNURLProperty other) => other.GetHashCode() == GetHashCode();
+
+        public override int GetHashCode() => HashCode.Combine(URLPrefix, Name, PartialDownloadSupport);
+
+        public override bool Equals([NotNullWhen(true)] object? obj) =>
+            obj is CDNURLProperty asCdnProperty && Equals(asCdnProperty);
+
+        public static bool operator ==(CDNURLProperty from, CDNURLProperty to)
+            => from.Equals(to);
+
+        public static bool operator !=(CDNURLProperty from, CDNURLProperty to)
+            => !(from == to);
+
+        public static bool operator ==(object? from, CDNURLProperty to)
+            => to.Equals(from);
+
+        public static bool operator !=(object? from, CDNURLProperty to)
+            => !(from == to);
+
+        public static bool operator ==(CDNURLProperty from, object? to)
+            => from.Equals(to);
+
+        public static bool operator !=(CDNURLProperty from, object? to)
+            => !(from == to);
     }
     #endregion