/// <summary>
/// Encodes a URL string so any characters that require percent encoding are encoded
/// </summary>
/// <param name="value">Value to encode</param>
/// <returns></returns>
public static String UrlEncode(String value)
{
if (!IsUnsafeUrlString(value))
{
return(value);
}
else
{
char c, d, e;
StringBuilder output = new StringBuilder();
for (int i = 0; i < value.Length; i++)
{
c = value[i];
if (!IsSafeCharacter(c))
{
if (c == '%')
{
if (i <= value.Length - 2)
{
d = value[i + 1];
e = value[i + 2];
if (IriSpecsHelper.IsHexDigit(d) && IriSpecsHelper.IsHexDigit(e))
{
//Has valid hex digits after it so continue encoding normally
output.Append(c);
}
else
{
//Need to encode a bare percent character
output.Append(PercentEncode(c));
}
}
else
{
//Not enough characters after a % to use as a valid escape so encode the percent
output.Append(PercentEncode(c));
}
}
else
{
//Contains an unsafe character so percent encode
output.Append(PercentEncode(c));
}
}
else
{
//No need to encode safe characters
output.Append(c);
}
}
return(output.ToString());
}
}
private static bool IsUnsafeUrlString(String value)
{
char c, d, e;
for (int i = 0; i < value.Length; i++)
{
c = value[i];
if (!IsSafeCharacter(c))
{
if (c == '%')
{
if (i <= value.Length - 2)
{
d = value[i + 1];
e = value[i + 2];
if (IriSpecsHelper.IsHexDigit(d) && IriSpecsHelper.IsHexDigit(e))
{
i += 2;
continue;
}
else
{
//Expected two hex digits after a % as an escape
return(true);
}
}
else
{
//Not enough characters after a % to use as a valid escape
return(true);
}
}
else
{
//Contains an unsafe character
return(true);
}
}
}
//All Characters OK
return(false);
}
