C#百分比编码å到%C3%A5基于RFC 5849 OAuth 1.0

Question

我正在尝试根据RFC 5849 OAuth 1.0将百分比编码为%C3%A5

http://tools.ietf.org/rfc/rfc5849.txt

这可以在GoCardless Ruby规范中看到 https://github.com/gocardless/gocardless-ruby/blob/master/spec/utils_spec.rb

 it "encodes non-ascii alpha characters" do
    subject["å"].should == "%C3%A5"
 end

我的C#代码如下所示:

    private const string UnreservedChars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-_.~";

    public static string PercentEncode(string value)
    {
        var input = new StringBuilder();
        foreach (char symbol in value)
        {
            if (UnreservedChars.IndexOf(symbol) != -1)
            {
                input.Append(symbol);
            }
            else
            {
                input.Append('%' + String.Format("{0:X2}", (int)symbol));
            }
        }

        return input.ToString();
    }

这些测试失败了:

[Test]
public void It_encodes_non_ascii_alpha_characters()
{
    Util.PercentEncode("å").ShouldBe("%C3%A5"); 
}

Expected string length 6 but was 3. Strings differ at index 1.
  Expected: "%C3%A5"
  But was:  "%E5"
  ------------^

这些测试失败了:

[Test]
public void It_encodes_other_non_ascii_characters()
{
    Util.PercentEncode("???").ShouldBe("%E6%94%AF%E6%89%95%E3%81%84");
}

Expected string length 27 but was 15. Strings differ at index 1.
 Expected: "%E6%94%AF%E6%89%95%E3%81%84"
 But was:  "%652F%6255%3044"
 ------------^

顺便说一下,我确实通过了以下测试:

[Test]
public void It_encodes_reserved_ascii_characters()
{
    Util.PercentEncode(" !\"#$%&'()").ShouldBe("%20%21%22%23%24%25%26%27%28%29");
    Util.PercentEncode("*+,/{|}:;").ShouldBe("%2A%2B%2C%2F%7B%7C%7D%3A%3B");
    Util.PercentEncode("<=>?@[\\]^`").ShouldBe("%3C%3D%3E%3F%40%5B%5C%5D%5E%60");
}

---

想要在这里做到这一点的任何人的编辑是工作C#代码:

public class Util
{
    private const string UnreservedChars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-_.~";

    public static string PercentEncode(string value)
    {
        var input = new StringBuilder();
        foreach (char symbol in value)
        {
            if (UnreservedChars.IndexOf(symbol) != -1)
            {
                input.Append(symbol);
            }
            else
            {
                byte[] bytes = Encoding.UTF8.GetBytes(symbol.ToString());
                foreach (byte b in bytes)
                {
                    input.AppendFormat("%{0:X2}", b);
                }
            }
        }

        return input.ToString();
    }
}

Answer 1

问题是你没有考虑到这一部分:

1. 如果文本值尚未按[RFC3629]编码,则首先将其编码为UTF-8八位字节.这不包括不供人类消费的二进制值.

所以你应该实际使用:

byte[] bytes = Encoding.UTF8.GetBytes(symbol.ToString());
foreach (byte b in bytes)
{
    input.AppendFormat("%{0:x2}", b);
}