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WebCmdlets parse XML declaration to get encoding value, if present. (#18748)

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CarloToso authored and GitHub committed 2023-01-21 22:26:39 +05:00
1 parent 1b3b359bcb
commit 099cbc1727
1 file changed
+31 -22
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src/Microsoft.PowerShell.Commands.Utility/commands/utility/WebCmdlet/StreamHelper.cs
+31 -22
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@@ -28,7 +28,7 @@ namespace Microsoft.PowerShell.Commands
private bool _isInitialized = false;
private readonly Cmdlet _ownerCmdlet;
#endregion
#endregion Data
#region Constructors
/// <summary>
@@ -44,7 +44,7 @@ namespace Microsoft.PowerShell.Commands
_originalStreamToProxy = stream;
_ownerCmdlet = cmdlet;
}
#endregion
#endregion Constructors
/// <summary>
/// </summary>
@@ -411,10 +411,15 @@ namespace Microsoft.PowerShell.Commands
return result;
}
private static readonly Regex s_metaexp = new(
private static readonly Regex s_metaRegex = new(
@"<meta\s.*[^.><]*charset\s*=\s*[""'\n]?(?<charset>[A-Za-z].[^\s""'\n<>]*)[\s""'\n>]",
RegexOptions.Compiled | RegexOptions.Singleline | RegexOptions.ExplicitCapture | RegexOptions.CultureInvariant | RegexOptions.IgnoreCase
RegexOptions.Compiled | RegexOptions.Singleline | RegexOptions.ExplicitCapture | RegexOptions.CultureInvariant | RegexOptions.IgnoreCase | RegexOptions.NonBacktracking
);
private static readonly Regex s_xmlRegex = new(
@"<\?xml\s.*[^.><]*encoding\s*=\s*[""'\n]?(?<charset>[A-Za-z].[^\s""'\n<>]*)[\s""'\n>]",
RegexOptions.Compiled | RegexOptions.Singleline | RegexOptions.ExplicitCapture | RegexOptions.CultureInvariant | RegexOptions.IgnoreCase | RegexOptions.NonBacktracking
);
internal static string DecodeStream(Stream stream, ref Encoding encoding)
{
@@ -429,27 +434,31 @@ namespace Microsoft.PowerShell.Commands
string content = StreamToString(stream, encoding);
if (isDefaultEncoding)
{
do
// We only look within the first 1k characters as the meta element and
// the xml declaration are at the start of the document
string substring = content.Substring(0, Math.Min(content.Length, 1024));
// Check for a charset attribute on the meta element to override the default
Match match = s_metaRegex.Match(substring);
// Check for a encoding attribute on the xml declaration to override the default
if (!match.Success)
{
// Check for a charset attribute on the meta element to override the default
// we only look within the first 1k characters as the meta tag is in the head
// tag which is at the start of the document
Match match = s_metaexp.Match(content.Substring(0, Math.Min(content.Length, 1024)));
if (match.Success)
match = s_xmlRegex.Match(substring);
}
if (match.Success)
{
Encoding localEncoding = null;
string characterSet = match.Groups["charset"].Value;
if (TryGetEncoding(characterSet, out localEncoding))
{
Encoding localEncoding = null;
string characterSet = match.Groups["charset"].Value;
if (TryGetEncoding(characterSet, out localEncoding))
{
stream.Seek(0, SeekOrigin.Begin);
content = StreamToString(stream, localEncoding);
// Report the encoding used.
encoding = localEncoding;
}
stream.Seek(0, SeekOrigin.Begin);
content = StreamToString(stream, localEncoding);
encoding = localEncoding;
}
} while (false);
}
}
return content;