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More cleanup

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This commit is contained in:
Tyrrrz 2023-10-11 01:20:30 +03:00
parent fb6cde38b6
commit 033d83bc4f
1 changed files with 15 additions and 17 deletions
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32
DiscordChatExporter.Core/Exporting/ExportAssetDownloader.cs
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@ -102,27 +102,25 @@ internal partial class ExportAssetDownloader
internal partial class ExportAssetDownloader
{
// Remove signature parameters from Discord CDN URLs to normalize them
private static string StripUrlSignatureParameters(string url)
{
var uri = new Uri(url);
if (!string.Equals(uri.Host, "cdn.discordapp.com", StringComparison.OrdinalIgnoreCase))
return url;
var query = HttpUtility.ParseQueryString(uri.Query);
query.Remove("ex");
query.Remove("is");
query.Remove("hm");
return uri.GetLeftPart(UriPartial.Path) + query;
}
private static string GetUrlHash(string url)
{
var normalizedUrl = StripUrlSignatureParameters(url);
// Remove signature parameters from Discord CDN URLs to normalize them
static string NormalizeUrl(string url)
{
var uri = new Uri(url);
if (!string.Equals(uri.Host, "cdn.discordapp.com", StringComparison.OrdinalIgnoreCase))
return url;
var query = HttpUtility.ParseQueryString(uri.Query);
query.Remove("ex");
query.Remove("is");
query.Remove("hm");
return uri.GetLeftPart(UriPartial.Path) + query;
}
return SHA256
.HashData(Encoding.UTF8.GetBytes(normalizedUrl))
.HashData(Encoding.UTF8.GetBytes(NormalizeUrl(url)))
.ToHex()
// 5 chars ought to be enough for anybody
.Truncate(5);