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// Copyright (c) Microsoft Corporation. All rights reserved. See License.txt in the project root for license information.
using System.Collections.Generic;
using System.ComponentModel;
using System.Diagnostics.Contracts;
using System.Linq;
using System.Net.Http.Headers;
namespace System.Net.Http
{
/// <summary>
/// Extension methods to provide convenience methods for finding <see cref="HttpContent"/> items
/// within a <see cref="IEnumerable{HttpContent}"/> collection.
/// </summary>
[EditorBrowsable(EditorBrowsableState.Never)]
public static class HttpContentCollectionExtensions
{
private const string ContentID = @"Content-ID";
/// <summary>
/// Returns the first <see cref="HttpContent"/> in a sequence that has a <see cref="ContentDispositionHeaderValue"/> header field
/// with a <see cref="ContentDispositionHeaderValue.DispositionType"/> property equal to <paramref name="dispositionType"/>.
/// </summary>
/// <param name="contents">The contents to evaluate</param>
/// <param name="dispositionType">The disposition type to look for.</param>
/// <returns>The first <see cref="HttpContent"/> in the sequence with a matching disposition type.</returns>
public static HttpContent FirstDispositionType(this IEnumerable<HttpContent> contents, string dispositionType)
{
if (contents == null)
{
throw new ArgumentNullException("contents");
}
if (String.IsNullOrWhiteSpace(dispositionType))
{
throw new ArgumentNullException("dispositionType");
}
return contents.First((item) =>
{
return HttpContentCollectionExtensions.FirstDispositionType(item, dispositionType);
});
}
/// <summary>
/// Returns the first <see cref="HttpContent"/> in a sequence that has a <see cref="ContentDispositionHeaderValue"/> header field
/// with a <see cref="ContentDispositionHeaderValue.DispositionType"/> property equal to <paramref name="dispositionType"/>.
/// </summary>
/// <param name="contents">The contents to evaluate</param>
/// <param name="dispositionType">The disposition type to look for.</param>
/// <returns>null if source is empty or if no element matches; otherwise the first <see cref="HttpContent"/> in
/// the sequence with a matching disposition type.</returns>
public static HttpContent FirstDispositionTypeOrDefault(this IEnumerable<HttpContent> contents, string dispositionType)
{
if (contents == null)
{
throw new ArgumentNullException("contents");
}
if (String.IsNullOrWhiteSpace(dispositionType))
{
throw new ArgumentNullException("dispositionType");
}
return contents.FirstOrDefault((item) =>
{
return HttpContentCollectionExtensions.FirstDispositionType(item, dispositionType);
});
}
/// <summary>
/// Returns the first <see cref="HttpContent"/> in a sequence that has a <see cref="ContentDispositionHeaderValue"/> header field
/// with a <see cref="ContentDispositionHeaderValue.Name"/> property equal to <paramref name="dispositionName"/>.
/// </summary>
/// <param name="contents">The contents to evaluate</param>
/// <param name="dispositionName">The disposition name to look for.</param>
/// <returns>The first <see cref="HttpContent"/> in the sequence with a matching disposition name.</returns>
public static HttpContent FirstDispositionName(this IEnumerable<HttpContent> contents, string dispositionName)
{
if (contents == null)
{
throw new ArgumentNullException("contents");
}
if (String.IsNullOrWhiteSpace(dispositionName))
{
throw new ArgumentNullException("dispositionName");
}
return contents.First((item) =>
{
return HttpContentCollectionExtensions.FirstDispositionName(item, dispositionName);
});
}
/// <summary>
/// Returns the first <see cref="HttpContent"/> in a sequence that has a <see cref="ContentDispositionHeaderValue"/> header field
/// with a <see cref="ContentDispositionHeaderValue.Name"/> property equal to <paramref name="dispositionName"/>.
/// </summary>
/// <param name="contents">The contents to evaluate</param>
/// <param name="dispositionName">The disposition name to look for.</param>
/// <returns>null if source is empty or if no element matches; otherwise the first <see cref="HttpContent"/> in
/// the sequence with a matching disposition name.</returns>
public static HttpContent FirstDispositionNameOrDefault(this IEnumerable<HttpContent> contents, string dispositionName)
{
if (contents == null)
{
throw new ArgumentNullException("contents");
}
if (String.IsNullOrWhiteSpace(dispositionName))
{
throw new ArgumentNullException("dispositionName");
}
return contents.FirstOrDefault((item) =>
{
return HttpContentCollectionExtensions.FirstDispositionName(item, dispositionName);
});
}
/// <summary>
/// Returns the <c>start</c> multipart body part. The <c>start</c> is used to identify the main body
/// in <c>multipart/related</c> content (see RFC 2387).
/// </summary>
/// <param name="contents">The contents to evaluate.</param>
/// <param name="start">The <c>start</c> value to look for.
/// A match is found if a <see cref="HttpContent"/> has a <c>Content-ID</c>
/// header field with the given value.</param>
/// <returns>The first <see cref="HttpContent"/> in the sequence with a matching value.</returns>
public static HttpContent FirstStart(this IEnumerable<HttpContent> contents, string start)
{
if (contents == null)
{
throw new ArgumentNullException("contents");
}
if (String.IsNullOrWhiteSpace(start))
{
throw new ArgumentNullException("start");
}
return contents.First((item) =>
{
return HttpContentCollectionExtensions.FirstStart(item, start);
});
}
/// <summary>
/// Returns the first <see cref="HttpContent"/> in a sequence that has a <see cref="ContentDispositionHeaderValue"/> header field
/// parameter equal to <paramref name="start"/>. This parameter is typically used in connection with <c>multipart/related</c>
/// content (see RFC 2387).
/// </summary>
/// <param name="contents">The contents to evaluate.</param>
/// <param name="start">The start value to look for. A match is found if a <see cref="HttpContent"/> has a <c>Content-ID</c>
/// header field with the given value.</param>
/// <returns>null if source is empty or if no element matches; otherwise the first <see cref="HttpContent"/> in
/// the sequence with a matching value.</returns>
public static HttpContent FirstStartOrDefault(this IEnumerable<HttpContent> contents, string start)
{
if (contents == null)
{
throw new ArgumentNullException("contents");
}
if (String.IsNullOrWhiteSpace(start))
{
throw new ArgumentNullException("start");
}
return contents.FirstOrDefault((item) =>
{
return HttpContentCollectionExtensions.FirstStart(item, start);
});
}
/// <summary>
/// Returns all instances of <see cref="HttpContent"/> in a sequence that has a <see cref="MediaTypeHeaderValue"/> header field
/// with a <see cref="MediaTypeHeaderValue.MediaType"/> property equal to the provided <paramref name="contentType"/>.
/// </summary>
/// <param name="contents">The content to evaluate</param>
/// <param name="contentType">The media type to look for.</param>
/// <returns>null if source is empty or if no element matches; otherwise the first <see cref="HttpContent"/> in
/// the sequence with a matching media type.</returns>
public static IEnumerable<HttpContent> FindAllContentType(this IEnumerable<HttpContent> contents, string contentType)
{
if (String.IsNullOrWhiteSpace(contentType))
{
throw new ArgumentNullException("contentType");
}
return HttpContentCollectionExtensions.FindAllContentType(contents, new MediaTypeHeaderValue(contentType));
}
/// <summary>
/// Returns all instances of <see cref="HttpContent"/> in a sequence that has a <see cref="MediaTypeHeaderValue"/> header field
/// with a <see cref="MediaTypeHeaderValue.MediaType"/> property equal to the provided <paramref name="contentType"/>.
/// </summary>
/// <param name="contents">The content to evaluate</param>
/// <param name="contentType">The media type to look for.</param>
/// <returns>null if source is empty or if no element matches; otherwise the first <see cref="HttpContent"/> in
/// the sequence with a matching media type.</returns>
public static IEnumerable<HttpContent> FindAllContentType(this IEnumerable<HttpContent> contents, MediaTypeHeaderValue contentType)
{
if (contents == null)
{
throw new ArgumentNullException("contents");
}
if (contentType == null)
{
throw new ArgumentNullException("contentType");
}
return contents.Where((item) =>
{
return HttpContentCollectionExtensions.FindAllContentType(item, contentType);
});
}
private static bool FirstStart(HttpContent content, string start)
{
Contract.Assert(content != null, "content cannot be null");
Contract.Assert(start != null, "start cannot be null");
if (content.Headers != null)
{
IEnumerable<string> values;
if (content.Headers.TryGetValues(ContentID, out values))
{
return String.Equals(
FormattingUtilities.UnquoteToken(values.ElementAt(0)),
FormattingUtilities.UnquoteToken(start),
StringComparison.OrdinalIgnoreCase);
}
}
return false;
}
private static bool FirstDispositionType(HttpContent content, string dispositionType)
{
Contract.Assert(content != null, "content cannot be null");
Contract.Assert(dispositionType != null, "dispositionType cannot be null");
return content.Headers != null && content.Headers.ContentDisposition != null &&
String.Equals(
FormattingUtilities.UnquoteToken(content.Headers.ContentDisposition.DispositionType),
FormattingUtilities.UnquoteToken(dispositionType),
StringComparison.OrdinalIgnoreCase);
}
private static bool FirstDispositionName(HttpContent content, string dispositionName)
{
Contract.Assert(content != null, "content cannot be null");
Contract.Assert(dispositionName != null, "dispositionName cannot be null");
return content.Headers != null && content.Headers.ContentDisposition != null &&
String.Equals(
FormattingUtilities.UnquoteToken(content.Headers.ContentDisposition.Name),
FormattingUtilities.UnquoteToken(dispositionName),
StringComparison.OrdinalIgnoreCase);
}
private static bool FindAllContentType(HttpContent content, MediaTypeHeaderValue contentType)
{
Contract.Assert(content != null, "content cannot be null");
Contract.Assert(contentType != null, "contentType cannot be null");
return content.Headers != null && content.Headers.ContentType != null &&
String.Equals(
content.Headers.ContentType.MediaType,
contentType.MediaType,
StringComparison.OrdinalIgnoreCase);
}
}
}
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