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MetadataExtensions.cs
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MetadataExtensions.cs
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//-----------------------------------------------------------------------
// <copyright file="MetadataExtensions.cs" company="Hibernating Rhinos LTD">
// Copyright (c) Hibernating Rhinos LTD. All rights reserved.
// </copyright>
//-----------------------------------------------------------------------
using System.Collections.Generic;
using System.Collections.Specialized;
using System.Globalization;
using System.Linq;
using System.Text;
using Newtonsoft.Json;
using System;
using Raven.Abstractions.Data;
using Raven.Json.Linq;
namespace Raven.Abstractions.Extensions
{
/// <summary>
/// Extensions for handling metadata
/// </summary>
public static class MetadataExtensions
{
private static readonly HashSet<string> HeadersToIgnoreServerDocument =
new HashSet<string>(StringComparer.OrdinalIgnoreCase)
{
"Content-Type",
};
private static readonly HashSet<string> HeadersToIgnoreClient = new HashSet<string>(StringComparer.OrdinalIgnoreCase)
{
// Raven internal headers
"Raven-Server-Build",
"Non-Authoritative-Information",
"Raven-Timer-Request",
"Raven-Authenticated-User",
//proxy
"Reverse-Via",
"Persistent-Auth",
"Allow",
"Content-Disposition",
"Content-Encoding",
"Content-Language",
"Content-Location",
"Content-MD5",
"Content-Range",
"Expires",
// ignoring this header, we handle this internally
"Last-Modified",
// Ignoring this header, since it may
// very well change due to things like encoding,
// adding metadata, etc
"Content-Length",
// Special things to ignore
"Keep-Alive",
"X-Powered-By",
"X-AspNet-Version",
"X-Requested-With",
"X-SourceFiles",
// Request headers
"Accept-Charset",
"Accept-Encoding",
"Accept",
"Accept-Language",
"Authorization",
"Cookie",
"Expect",
"From",
"Host",
"If-Match",
"If-Modified-Since",
"If-None-Match",
"If-Range",
"If-Unmodified-Since",
"Max-Forwards",
"Referer",
"TE",
"User-Agent",
//Response headers
"Accept-Ranges",
"Age",
"Allow",
"ETag",
"Location",
"Retry-After",
"Server",
"Set-Cookie2",
"Set-Cookie",
"Vary",
"Www-Authenticate",
// General
"Cache-Control",
"Connection",
"Date",
"Pragma",
"Trailer",
"Transfer-Encoding",
"Upgrade",
"Via",
"Warning",
};
/// <summary>
/// Filters the headers from unwanted headers
/// </summary>
/// <param name="self">The self.</param>
/// <param name="isServerDocument">if set to <c>true</c> [is server document].</param>
/// <returns></returns>public static RavenJObject FilterHeaders(this System.Collections.Specialized.NameValueCollection self, bool isServerDocument)
public static RavenJObject FilterHeaders(this RavenJObject self, bool isServerDocument)
{
if (self == null)
return self;
var metadata = new RavenJObject();
foreach (var header in self)
{
if(header.Key.StartsWith("Temp"))
continue;
if(header.Key == Constants.DocumentIdFieldName)
continue;
if (HeadersToIgnoreClient.Contains(header.Key))
continue;
if (isServerDocument && HeadersToIgnoreServerDocument.Contains(header.Key))
continue;
var headerName = CaptureHeaderName(header.Key);
metadata[headerName] = header.Value;
}
return metadata;
}
#if SILVERLIGHT
/// <summary>
/// Filters the headers from unwanted headers
/// </summary>
/// <param name="self">The self.</param>
/// <param name="isServerDocument">if set to <c>true</c> [is server document].</param>
/// <returns></returns>public static RavenJObject FilterHeaders(this System.Collections.Specialized.NameValueCollection self, bool isServerDocument)
public static RavenJObject FilterHeaders(this IDictionary<string, IList<string>> self, bool isServerDocument)
{
var metadata = new RavenJObject();
foreach (var header in self)
{
if (header.Key.StartsWith("Temp"))
continue;
if (HeadersToIgnoreClient.Contains(header.Key))
continue;
if(isServerDocument && HeadersToIgnoreServerDocument.Contains(header.Key))
continue;
var values = header.Value;
var headerName = CaptureHeaderName(header.Key);
if (values.Count == 1)
metadata.Add(headerName, GetValue(values[0]));
else
metadata.Add(headerName, new RavenJArray(values.Select(GetValue)));
}
return metadata;
}
#else
/// <summary>
/// Filters the headers from unwanted headers
/// </summary>
/// <param name="self">The self.</param>
/// <param name="isServerDocument">if set to <c>true</c> [is server document].</param>
/// <returns></returns>public static RavenJObject FilterHeaders(this System.Collections.Specialized.NameValueCollection self, bool isServerDocument)
public static RavenJObject FilterHeaders(this NameValueCollection self, bool isServerDocument)
{
var metadata = new RavenJObject(StringComparer.InvariantCultureIgnoreCase);
foreach (string header in self)
{
try
{
if(header.StartsWith("Temp"))
continue;
if (HeadersToIgnoreClient.Contains(header))
continue;
if (isServerDocument && HeadersToIgnoreServerDocument.Contains(header))
continue;
var values = self.GetValues(header);
var headerName = CaptureHeaderName(header);
// TODO: Can values be null?
if (values.Length == 1)
metadata[headerName] = GetValue(values[0]);
else
metadata[headerName] = new RavenJArray(values.Select(GetValue));
}
catch (Exception exc)
{
throw new JsonReaderException(string.Concat("Unable to Filter Header: ", header), exc);
}
}
return metadata;
}
#endif
private static string CaptureHeaderName(string header)
{
var lastWasDash = true;
var sb = new StringBuilder(header.Length);
foreach (var ch in header)
{
sb.Append(lastWasDash ? char.ToUpper(ch) : ch);
lastWasDash = ch == '-';
}
return sb.ToString();
}
private static RavenJToken GetValue(string val)
{
try
{
if (val.StartsWith("{"))
return RavenJObject.Parse(val);
if (val.StartsWith("["))
return RavenJArray.Parse(val);
DateTime result;
if (DateTime.TryParseExact(val, new[]{"r","o"}, CultureInfo.InvariantCulture, DateTimeStyles.None, out result))
return new RavenJValue(result);
return new RavenJValue(val);
}
catch (Exception exc)
{
throw new JsonReaderException(string.Concat("Unable to get value: ", val), exc);
}
}
}
}