/// <summary>
/// Generates a string from the given absolute or relative Uri that is appropriately encoded for use in
/// HTTP headers. Note that a unicode host name will be encoded as punycode.
/// </summary>
/// <param name="uri">The Uri to encode.</param>
/// <returns></returns>
public static string Encode(Uri uri)
{
if (uri.IsAbsoluteUri)
{
return(BuildAbsolute(
scheme: uri.Scheme,
host: HostString.FromUriComponent(uri),
pathBase: PathString.FromUriComponent(uri),
query: QueryString.FromUriComponent(uri),
fragment: FragmentString.FromUriComponent(uri)));
}
else
{
return(uri.GetComponents(UriComponents.SerializationInfoString, UriFormat.UriEscaped));
}
}
/// <summary>
/// Seperates the given absolute URI string into components. Assumes no PathBase.
/// </summary>
/// <param name="uri">A string representation of the uri.</param>
/// <param name="scheme">http, https, etc.</param>
/// <param name="host">The host portion of the uri normally included in the Host header. This may include the port.</param>
/// <param name="path">The portion of the request path that identifies the requested resource.</param>
/// <param name="query">The query, if any.</param>
/// <param name="fragment">The fragment, if any.</param>
public static void FromAbsolute(string uri, out string scheme, out HostString host, out PathString path, out QueryString query, out FragmentString fragment)
{
if (uri == null)
{
throw new ArgumentNullException(nameof(uri));
}
// Satisfy the out parameters
path = new PathString();
query = new QueryString();
fragment = new FragmentString();
var startIndex = uri.IndexOf(SchemeDelimiter);
if (startIndex < 0)
{
throw new FormatException("No scheme delimiter in uri.");
}
scheme = uri.Substring(0, startIndex);
// PERF: Calculate the end of the scheme for next IndexOf
startIndex += SchemeDelimiter.Length;
var searchIndex = -1;
var limit = uri.Length;
if ((searchIndex = uri.IndexOf(Pound, startIndex)) >= 0 && searchIndex < limit)
{
fragment = FragmentString.FromUriComponent(uri.Substring(searchIndex));
limit = searchIndex;
}
if ((searchIndex = uri.IndexOf(QuestionMark, startIndex)) >= 0 && searchIndex < limit)
{
query = QueryString.FromUriComponent(uri.Substring(searchIndex, limit - searchIndex));
limit = searchIndex;
}
if ((searchIndex = uri.IndexOf(ForwardSlash, startIndex)) >= 0 && searchIndex < limit)
{
path = PathString.FromUriComponent(uri.Substring(searchIndex, limit - searchIndex));
limit = searchIndex;
}
host = HostString.FromUriComponent(uri.Substring(startIndex, limit - startIndex));
}
/// <summary>
/// Combines the given URI components into a string that is properly encoded for use in HTTP headers.
/// Note that unicode in the HostString will be encoded as punycode.
/// </summary>
/// <param name="scheme">http, https, etc.</param>
/// <param name="host">The host portion of the uri normally included in the Host header. This may include the port.</param>
/// <param name="pathBase">The first portion of the request path associated with application root.</param>
/// <param name="path">The portion of the request path that identifies the requested resource.</param>
/// <param name="query">The query, if any.</param>
/// <param name="fragment">The fragment, if any.</param>
/// <returns></returns>
public static string BuildAbsolute(string scheme, HostString host, PathString pathBase = new PathString(), PathString path = new PathString(), QueryString query = new QueryString(), FragmentString fragment = new FragmentString())
{
var combinedPath = (pathBase.HasValue || path.HasValue) ? (pathBase + path).ToString() : "/";
var encodedHost = host.ToString();
var encodedQuery = query.ToString();
var encodedFragment = fragment.ToString();
// PERF: Calculate string length to allocate correct buffer size for StringBuilder.
var length = scheme.Length + SchemeDelimiter.Length + encodedHost.Length
+ combinedPath.Length + encodedQuery.Length + encodedFragment.Length;
return(new StringBuilder(length)
.Append(scheme)
.Append(SchemeDelimiter)
.Append(encodedHost)
.Append(combinedPath)
.Append(encodedQuery)
.Append(encodedFragment)
.ToString());
}
