public CoapResource(CoapResourceMetadata metadata)
{
Metadata = metadata;
}
public static List <CoapResourceMetadata> Parse(string message)
{
var state = FormatState.LinkValue;
var mPos = 0;
var result = new List <CoapResourceMetadata>();
CoapResourceMetadata currentResourceMetadata = null;
try
{
var run = true;
do
{
if (mPos >= message.Length)
{
break;
}
int mSeek;
switch (state)
{
case FormatState.LinkValue:
if (message[mPos++] != '<')
{
throw new ArgumentException($"Expected link-value '<' at pos {mPos}");
}
mSeek = message.IndexOf('>', mPos);
if (currentResourceMetadata != null)
{
result.Add(currentResourceMetadata);
}
currentResourceMetadata = new CoapResourceMetadata(message.Substring(mPos, mSeek - mPos));
mPos = mSeek + 1;
break;
case FormatState.LinkParam:
if (currentResourceMetadata == null)
{
throw new InvalidOperationException();
}
mSeek = message.IndexOf('=', mPos);
var param = message.Substring(mPos, mSeek - mPos);
mPos = mSeek + 1;
mSeek = message.IndexOfAny(new char[] { ',', ';' }, mPos);
if (mSeek == -1)
{
mSeek = message.Length;
}
var value = message.Substring(mPos, mSeek - mPos);
switch (param)
{
case "if":
value = value.Substring(1, value.Length - 2);
foreach (var s in value.Split(' '))
{
currentResourceMetadata.InterfaceDescription.Add(s);
}
break;
case "rt":
value = value.Substring(1, value.Length - 2);
foreach (var s in value.Split(' '))
{
currentResourceMetadata.ResourceTypes.Add(s);
}
break;
case "rel":
if (currentResourceMetadata.Rel.Count == 0)
{
value = value.Substring(1, value.Length - 2);
foreach (var s in value.Split(' '))
{
currentResourceMetadata.Rel.Add(s);
}
}
break;
case "anchor":
currentResourceMetadata.Anchor = value.Substring(1, value.Length - 2);
break;
case "hreflang":
// Much easier to let libraries offload language formatting stuff
currentResourceMetadata.HrefLang = new System.Globalization.CultureInfo(value).Name.ToLower();
break;
case "media":
if (value[0] == '"')
{
if (value[value.Length - 1] != '"')
{
throw new ArgumentException($"Expected MediaDesc DQUOTE '\"' at pos {mSeek}");
}
value = value.Substring(1, value.Length - 2);
}
currentResourceMetadata.Media = value;
break;
case "title":
if (value[0] != '"')
{
throw new ArgumentException($"Expected QuotedString DQUOTE '\"' at pos {mPos}");
}
if (value[value.Length - 1] != '"')
{
throw new ArgumentException($"Expected QuotedString DQUOTE '\"' at pos {mSeek}");
}
currentResourceMetadata.Title = value.Substring(1, value.Length - 2);
break;
case "title*":
// TODO: No idea what to do here...?
var charset = value.Substring(0, value.IndexOf('\''));
var lang = value.Substring(charset.Length + 1, value.IndexOf('\'', charset.Length + 1) - charset.Length - 1);
value = value.Substring(charset.Length + lang.Length + 3, value.Length - charset.Length - lang.Length - 4);
//System.Diagnostics.Debug.WriteLine("title* = {3}\n\tCharset: {0}\n\tLanguage: {1}\n\tValue: {2}",
// charset, lang, value, Uri.UnescapeDataString(value));
currentResourceMetadata.TitleExt = Uri.UnescapeDataString(value);
break;
case "type":
if (value[0] == '"')
{
if (value[value.Length - 1] != '"')
{
throw new ArgumentException($"Expected Type DQUOTE '\"' at pos {mSeek}");
}
value = value.Substring(1, value.Length - 2);
}
currentResourceMetadata.Type = value;
break;
case "sz":
if (value[0] == '0' && value.Length != 1)
{
throw new ArgumentException($"cardinal may not start with '0' unless at pos {mSeek}");
}
if (!ulong.TryParse(value, out var maxSize))
{
throw new ArgumentException($"Could not parse cardinal at pos {mSeek}");
}
currentResourceMetadata.MaxSize = maxSize;
break;
case "ct":
int ct = 0;
currentResourceMetadata.SuggestedContentTypes.Clear();
if (value[0] == '"')
{
if (value[value.Length - 1] != '"')
{
throw new ArgumentException($"Expected Type DQUOTE '\"' at pos {mSeek}");
}
foreach (var contentFormatType in value
.Substring(1, value.Length - 2)
.Split(' ')
.Select(s => (Options.ContentFormatType) int.Parse(s)))
{
currentResourceMetadata.SuggestedContentTypes.Add(contentFormatType);
}
}
else
{
if (value[0] == '0' && value.Length != 1)
{
throw new ArgumentException($"cardinal may not start with '0' unless at pos {mSeek}");
}
if (!int.TryParse(value, out ct))
{
throw new ArgumentException($"Could not parse cardinal at pos {mSeek}");
}
currentResourceMetadata.SuggestedContentTypes.Add(ct);
}
break;
default:
if (value.Length == 1)
{
if (!char.IsLetterOrDigit(value[0]) && !new [] { '!', '#', '$', '%', '&', '\'', '(', ')', '*', '+', '-', '.', '/', ':', '<', '=', '>', '?', '@', '[', ']', '^', '_', '`', '{', '|', '}', '~' }.Contains(value[0]))
{
throw new ArgumentException($"PToken contains invalid character '{value[0]}' at pos {mSeek}");
}
currentResourceMetadata.Extentions.Add(param, value);
}
else
{
if (value[0] != '"')
{
throw new ArgumentException($"Expected QuotedString DQUOTE '\"' at pos {mPos}");
}
if (value[value.Length - 1] != '"')
{
throw new ArgumentException($"Expected QuotedString DQUOTE '\"' at pos {mSeek}");
}
currentResourceMetadata.Extentions.Add(param, value.Substring(1, value.Length - 2));
}
break;
}
mPos = mSeek;
break;
default:
run = false;
break;
}
if (message[mPos] == ';')
{
state = FormatState.LinkParam;
}
else if (message[mPos] == ',')
{
state = FormatState.LinkValue;
}
else
{
throw new ArgumentException($"Invalid character '{message[mPos]}' at pos {mPos}");
}
mPos++;
}while (run);
}
catch (IndexOutOfRangeException)
{
// Moving on...
}
if (currentResourceMetadata != null)
{
result.Add(currentResourceMetadata);
}
return(result);
}
public CoapResource(Uri uri)
{
Metadata = new CoapResourceMetadata(uri);
}
public static string ToCoreLinkFormat(CoapResourceMetadata resource, Uri baseUri = null)
{
var message = new StringBuilder();
try
{
if (baseUri == null)
{
baseUri = _throwAwayUri;
}
var uri = resource.UriReference.IsAbsoluteUri
? resource.UriReference
: new Uri(baseUri, resource.UriReference);
message.Append(CoapUri.Compare(uri, baseUri, UriComponents.HostAndPort, UriFormat.SafeUnescaped, StringComparison.OrdinalIgnoreCase) == 0
? $"<{uri.AbsolutePath}>"
: $"<{uri}>");
if (resource.InterfaceDescription.Count > 0)
{
message.AppendFormat(";if=\"{0}\"", string.Join(" ", resource.InterfaceDescription));
}
if (resource.SuggestedContentTypes.Count == 1)
{
message.Append($";ct={(int)resource.SuggestedContentTypes.First():D}");
}
if (resource.SuggestedContentTypes.Count > 1)
{
message.AppendFormat(";ct=\"{0}\"", string.Join(" ", resource.SuggestedContentTypes.Select(ct => ((int)ct).ToString("D"))));
}
if (resource.ResourceTypes.Count > 0)
{
message.AppendFormat(";rt=\"{0}\"", string.Join(" ", resource.ResourceTypes));
}
if (resource.Rel.Count == 1)
{
message.AppendFormat(";rel={0}", resource.Rel.First());
}
if (resource.Rel.Count > 1)
{
message.AppendFormat(";rel=\"{0}\"", string.Join(" ", resource.Rel));
}
if (!string.IsNullOrEmpty(resource.Anchor))
{
message.Append($";anchor=\"{resource.Anchor}\"");
}
if ((resource.HrefLang ?? string.Empty) != string.Empty)
{
message.Append($";hreflang={resource.HrefLang?.ToLower()}");
}
if ((resource.Media ?? string.Empty) != string.Empty)
{
message.Append(resource.Media.Any(c => c == ';' || c == ',')
? $";media=\"{resource.Media}\""
: $";media={resource.Media}");
}
if ((resource.Title ?? string.Empty) != string.Empty)
{
message.Append($";title=\"{resource.Title}\"");
}
//case "title*":
// // TODO: No idea what to do here...?
// var charset = value.Substring(0, value.IndexOf('\''));
// var lang = value.Substring(charset.Length + 1,
// value.IndexOf('\'', charset.Length + 1) - charset.Length - 1);
// value = value.Substring(charset.Length + lang.Length + 3,
// value.Length - charset.Length - lang.Length - 4);
// //System.Diagnostics.Debug.WriteLine("title* = {3}\n\tCharset: {0}\n\tLanguage: {1}\n\tValue: {2}",
// // charset, lang, value, Uri.UnescapeDataString(value));
// resource.TitleExt = Uri.UnescapeDataString(value);
// break;
if ((resource.Type ?? string.Empty) != string.Empty)
{
message.Append(resource.Type.Contains(" ")
? $";type=\"{resource.Type}\""
: $";type={resource.Type}");
}
if (resource.MaxSize != 0)
{
message.Append($";sz={resource.MaxSize:D}");
}
//default:
// if (value.Length == 1)
// {
// if (!char.IsLetterOrDigit(value[0]) && !new[]
// {
// '!', '#', '$', '%', '&', '\'', '(', ')', '*', '+', '-', '.', '/', ':',
// '<', '=', '>', '?', '@', '[', ']', '^', '_', '`', '{', '|', '}', '~'
// }.Contains(value[0]))
// throw new ArgumentException(
// $"PToken contains invalid character '{value[0]}' at pos {mSeek}");
// resource.Extentions.Add(param, value);
// }
// else
// {
// if (value[0] != '"')
// throw new ArgumentException(
// $"Expected QuotedString DQUOTE '\"' at pos {mPos}");
// if (value[value.Length - 1] != '"')
// throw new ArgumentException(
// $"Expected QuotedString DQUOTE '\"' at pos {mSeek}");
// resource.Extentions.Add(param,
// value.Substring(1, value.Length - 2));
// }
// break;
}
catch (IndexOutOfRangeException)
{
// Moving on...
}
return(message.ToString());
}
