internal static IEnumerable <IfHeaderCondition> Parse([NotNull] StringSource source, [NotNull] EntityTagComparer entityTagComparer)
{
while (!source.SkipWhiteSpace())
{
var isNot = false;
EntityTag?etag = null;
if (source.AdvanceIf("Not", StringComparison.OrdinalIgnoreCase))
{
isNot = true;
source.SkipWhiteSpace();
}
Uri stateToken;
if (CodedUrlParser.TryParse(source, out stateToken))
{
// Coded-URL found
}
else if (source.Get() == '[')
{
// Entity-tag found
etag = EntityTag.Parse(source).Single();
if (!source.AdvanceIf("]"))
{
throw new ArgumentException($"{source.Remaining} is not a valid condition (ETag not ending with ']')", nameof(source));
}
}
else
{
source.Back();
break;
}
yield return(new IfHeaderCondition(isNot, stateToken, etag, entityTagComparer));
}
}
internal static IEnumerable <EntityTag> Parse(StringSource source)
{
while (!source.SkipWhiteSpace())
{
bool isWeak;
if (source.AdvanceIf("W/\"", StringComparison.OrdinalIgnoreCase))
{
isWeak = true;
}
else if (!source.AdvanceIf("\""))
{
break;
}
else
{
isWeak = false;
}
var etagText = source.GetUntil('"');
if (etagText == null)
{
throw new ArgumentException($"{source.Remaining} is not a valid ETag", nameof(source));
}
yield return(new EntityTag(isWeak, etagText));
if (source.Advance(1).SkipWhiteSpace())
{
break;
}
if (!source.AdvanceIf(","))
{
break;
}
}
}
internal static IEnumerable <IfHeaderList> Parse(StringSource source, EntityTagComparer etagComparer, IWebDavContext context)
{
Uri previousResourceTag = context.PublicAbsoluteRequestUrl;
while (!source.SkipWhiteSpace())
{
if (CodedUrlParser.TryParse(source, out var resourceTag))
{
// Coded-URL found
if (!resourceTag.IsAbsoluteUri)
{
resourceTag = new Uri(context.PublicRootUrl, resourceTag);
}
previousResourceTag = resourceTag;
source.SkipWhiteSpace();
}
else
{
resourceTag = previousResourceTag;
}
if (!source.AdvanceIf("("))
{
throw new ArgumentException($"{source.Remaining} is not a valid list (not starting with a '(')", nameof(source));
}
var conditions = IfHeaderCondition.Parse(source, etagComparer).ToList();
if (!source.AdvanceIf(")"))
{
throw new ArgumentException($"{source.Remaining} is not a valid list (not ending with a ')')", nameof(source));
}
var relativeHref = context.PublicControllerUrl.IsBaseOf(resourceTag) ? AddRootSlashToUri(context.PublicControllerUrl.MakeRelativeUri(resourceTag)) : resourceTag;
var path = context.PublicControllerUrl.IsBaseOf(resourceTag) ? context.PublicControllerUrl.MakeRelativeUri(resourceTag) : resourceTag;
yield return(new IfHeaderList(resourceTag, relativeHref, path, conditions));
}
}
/// <summary>
/// Tries to parse the <c>Coded-URL</c> from a <see cref="StringSource"/>
/// </summary>
/// <param name="source">The <see cref="StringSource"/> to parse the <c>Coded-URL</c> from</param>
/// <param name="codedUrl">The parsed <c>Coded-URL</c></param>
/// <returns><see langword="true"/> when the <c>Coded-URL</c> could be parsed successfully</returns>
internal static bool TryParse([NotNull] StringSource source, out Uri codedUrl)
{
if (!source.AdvanceIf("<"))
{
codedUrl = null;
return(false);
}
// Coded-URL found
var codedUrlText = source.GetUntil('>');
if (codedUrlText == null)
{
throw new ArgumentException($"{source.Remaining} is not a valid Coded-URL (not ending with '>')", nameof(source));
}
source.Advance(1);
codedUrl = new Uri(codedUrlText, UriKind.RelativeOrAbsolute);
return(true);
}