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Fix PathString over-encoding 

Base on RFC 3986, ensure following characters are not encoded

alpha, digit, "-", "_", ".", "~", "@", ":", "/", "!", "$", ";", "=",
"'", "(", ")", "*", "+", ","
This commit is contained in:
Troy Dai 2016-07-07 10:06:30 -07:00
parent 748e96f513
commit 150b4708f1
3 changed files with 119 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

32
src/Microsoft.AspNetCore.Http.Abstractions/Internal/PathStringHelper.cs Normal file
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@ -0,0 +1,32 @@
// Copyright (c) .NET Foundation. All rights reserved.
// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
namespace Microsoft.AspNetCore.Http.Internal
{
internal class PathStringHelper
{
private static bool[] ValidPathChars = {
false, false, false, false, false, false, false, false, // 0x00 - 0x07
false, false, false, false, false, false, false, false, // 0x08 - 0x0F
false, false, false, false, false, false, false, false, // 0x10 - 0x17
false, false, false, false, false, false, false, false, // 0x18 - 0x1F
false, true, false, false, true, false, true, true, // 0x20 - 0x27
true, true, true, true, true, true, true, true, // 0x28 - 0x2F
true, true, true, true, true, true, true, true, // 0x30 - 0x37
true, true, true, true, false, true, false, false, // 0x38 - 0x3F
true, true, true, true, true, true, true, true, // 0x40 - 0x47
true, true, true, true, true, true, true, true, // 0x48 - 0x4F
true, true, true, true, true, true, true, true, // 0x50 - 0x57
true, true, true, false, false, false, false, true, // 0x58 - 0x5F
false, true, true, true, true, true, true, true, // 0x60 - 0x67
true, true, true, true, true, true, true, true, // 0x68 - 0x6F
true, true, true, true, true, true, true, true, // 0x70 - 0x77
true, true, true, false, false, false, true, false, // 0x78 - 0x7F
};
public static bool IsValidPathChar(char c)
{
return c < ValidPathChars.Length && ValidPathChars[c];
}
}
}

83
src/Microsoft.AspNetCore.Http.Abstractions/PathString.cs
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@ -2,8 +2,9 @@
// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information. // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
using System; using System;
using System.Text.Encodings.Web; using System.Text;
using Microsoft.AspNetCore.Http.Abstractions; using Microsoft.AspNetCore.Http.Abstractions;
using Microsoft.AspNetCore.Http.Internal;
namespace Microsoft.AspNetCore.Http namespace Microsoft.AspNetCore.Http
{ {
@ -66,25 +67,83 @@ namespace Microsoft.AspNetCore.Http
/// <returns>The escaped path value</returns> /// <returns>The escaped path value</returns>
public string ToUriComponent() public string ToUriComponent()
{ {
// TODO: Measure the cost of this escaping and consider optimizing.
if (!HasValue) if (!HasValue)
{ {
return string.Empty; return string.Empty;
} }
var values = _value.Split(splitChar);
var changed = false;
for (var i = 0; i < values.Length; i++)
{
var value = values[i];
values[i] = UrlEncoder.Default.Encode(value);
if (!changed && value != values[i]) StringBuilder buffer = null;
var start = 0;
var count = 0;
var requiresEscaping = false;
for (int i = 0; i < _value.Length; ++i)
{
if (PathStringHelper.IsValidPathChar(_value[i]))
{ {
changed = true; if (requiresEscaping)
{
// the current segment requires escape
if (buffer == null)
{
buffer = new StringBuilder(_value.Length * 3);
}
buffer.Append(Uri.EscapeDataString(_value.Substring(start, count)));
requiresEscaping = false;
start = i;
count = 0;
}
count++;
}
else
{
if (!requiresEscaping)
{
// the current segument doesn't require escape
if (buffer == null)
{
buffer = new StringBuilder(_value.Length * 3);
}
buffer.Append(_value, start, count);
requiresEscaping = true;
start = i;
count = 0;
}
count++;
} }
} }
return changed ? string.Join("/", values) : _value; if (count == _value.Length && !requiresEscaping)
{
return _value;
}
else
{
if (count > 0)
{
if (buffer == null)
{
buffer = new StringBuilder(_value.Length * 3);
}
if (requiresEscaping)
{
buffer.Append(Uri.EscapeDataString(_value.Substring(start, count)));
}
else
{
buffer.Append(_value, start, count);
}
}
return buffer.ToString();
}
} }
/// <summary> /// <summary>
@ -335,7 +394,7 @@ namespace Microsoft.AspNetCore.Http
/// Implicitly calls ToString(). /// Implicitly calls ToString().
/// </summary> /// </summary>
/// <param name="path"></param> /// <param name="path"></param>
public static implicit operator string (PathString path) public static implicit operator string(PathString path)
{ {
return path.ToString(); return path.ToString();
} }

16
test/Microsoft.AspNetCore.Http.Abstractions.Tests/PathStringTests.cs
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@ -185,5 +185,21 @@ namespace Microsoft.AspNetCore.Http
Assert.Equal(expectedResult, result); Assert.Equal(expectedResult, result);
} }
[Theory]
[InlineData("unreserved", "/abc123.-_~", "/abc123.-_~")]
[InlineData("colon", "/:", "/:")]
[InlineData("at", "/@", "/@")]
[InlineData("sub-delims", "/!$&'()*+,;=", "/!$&'()*+,;=")]
[InlineData("reserved", "/?#[]", "/%3F%23%5B%5D")]
[InlineData("pct-encoding", "/单行道", "/%E5%8D%95%E8%A1%8C%E9%81%93")]
[InlineData("mixed1", "/index/单行道=(x*y)[abc]", "/index/%E5%8D%95%E8%A1%8C%E9%81%93=(x*y)%5Babc%5D")]
[InlineData("mixed2", "/index/单行道=(x*y)[abc]_", "/index/%E5%8D%95%E8%A1%8C%E9%81%93=(x*y)%5Babc%5D_")]
public void ToUriComponentEscapeCorrectly(string category, string input, string expected)
{
var path = new PathString(input);
Assert.Equal(expected, path.ToUriComponent());
}
} }
} }