404 lines
9.8 KiB
C#
404 lines
9.8 KiB
C#
//
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// CacheControlHeaderValue.cs
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//
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// Authors:
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// Marek Safar <marek.safar@gmail.com>
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//
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// Copyright (C) 2011 Xamarin Inc (http://www.xamarin.com)
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//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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using System.Collections.Generic;
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using System.Text;
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using System.Globalization;
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namespace System.Net.Http.Headers
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{
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public class CacheControlHeaderValue : ICloneable
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{
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List<NameValueHeaderValue> extensions;
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List<string> no_cache_headers, private_headers;
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public ICollection<NameValueHeaderValue> Extensions {
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get {
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return extensions ?? (extensions = new List<NameValueHeaderValue> ());
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}
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}
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public TimeSpan? MaxAge { get; set; }
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public bool MaxStale { get; set; }
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public TimeSpan? MaxStaleLimit { get; set; }
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public TimeSpan? MinFresh { get; set; }
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public bool MustRevalidate { get; set; }
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public bool NoCache { get; set; }
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public ICollection<string> NoCacheHeaders {
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get {
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return no_cache_headers ?? (no_cache_headers = new List<string> ());
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}
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}
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public bool NoStore { get; set; }
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public bool NoTransform { get; set; }
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public bool OnlyIfCached { get; set; }
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public bool Private { get; set; }
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public ICollection<string> PrivateHeaders {
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get {
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return private_headers ?? (private_headers = new List<string> ());
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}
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}
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public bool ProxyRevalidate { get; set; }
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public bool Public { get; set; }
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public TimeSpan? SharedMaxAge { get; set; }
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object ICloneable.Clone ()
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{
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var copy = (CacheControlHeaderValue) MemberwiseClone ();
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if (extensions != null) {
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copy.extensions = new List<NameValueHeaderValue> ();
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foreach (var entry in extensions) {
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copy.extensions.Add (entry);
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}
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}
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if (no_cache_headers != null) {
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copy.no_cache_headers = new List<string> ();
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foreach (var entry in no_cache_headers) {
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copy.no_cache_headers.Add (entry);
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}
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}
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if (private_headers != null) {
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copy.private_headers = new List<string> ();
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foreach (var entry in private_headers) {
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copy.private_headers.Add (entry);
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}
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}
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return copy;
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}
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public override bool Equals (object obj)
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{
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var source = obj as CacheControlHeaderValue;
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if (source == null)
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return false;
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if (MaxAge != source.MaxAge || MaxStale != source.MaxStale || MaxStaleLimit != source.MaxStaleLimit ||
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MinFresh != source.MinFresh || MustRevalidate != source.MustRevalidate || NoCache != source.NoCache ||
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NoStore != source.NoStore || NoTransform != source.NoTransform || OnlyIfCached != source.OnlyIfCached ||
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Private != source.Private || ProxyRevalidate != source.ProxyRevalidate || Public != source.Public ||
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SharedMaxAge != source.SharedMaxAge)
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return false;
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return extensions.SequenceEqual (source.extensions) &&
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no_cache_headers.SequenceEqual (source.no_cache_headers) &&
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private_headers.SequenceEqual (source.private_headers);
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}
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public override int GetHashCode ()
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{
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int hc = 29;
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unchecked {
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hc = hc * 29 + HashCodeCalculator.Calculate (extensions);
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hc = hc * 29 + MaxAge.GetHashCode ();
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hc = hc * 29 + MaxStale.GetHashCode ();
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hc = hc * 29 + MaxStaleLimit.GetHashCode ();
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hc = hc * 29 + MinFresh.GetHashCode ();
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hc = hc * 29 + MustRevalidate.GetHashCode ();
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hc = hc * 29 + HashCodeCalculator.Calculate (no_cache_headers);
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hc = hc * 29 + NoCache.GetHashCode ();
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hc = hc * 29 + NoStore.GetHashCode ();
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hc = hc * 29 + NoTransform.GetHashCode ();
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hc = hc * 29 + OnlyIfCached.GetHashCode ();
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hc = hc * 29 + Private.GetHashCode ();
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hc = hc * 29 + HashCodeCalculator.Calculate (private_headers);
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hc = hc * 29 + ProxyRevalidate.GetHashCode ();
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hc = hc * 29 + Public.GetHashCode ();
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hc = hc * 29 + SharedMaxAge.GetHashCode ();
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}
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return hc;
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}
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public static CacheControlHeaderValue Parse (string input)
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{
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CacheControlHeaderValue value;
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if (TryParse (input, out value))
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return value;
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throw new FormatException (input);
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}
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public static bool TryParse (string input, out CacheControlHeaderValue parsedValue)
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{
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parsedValue = null;
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if (input == null)
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return true;
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var value = new CacheControlHeaderValue ();
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var lexer = new Lexer (input);
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Token t;
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do {
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t = lexer.Scan ();
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if (t != Token.Type.Token)
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return false;
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string s = lexer.GetStringValue (t);
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bool token_read = false;
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TimeSpan? ts;
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switch (s) {
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case "no-store":
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value.NoStore = true;
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break;
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case "no-transform":
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value.NoTransform = true;
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break;
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case "only-if-cached":
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value.OnlyIfCached = true;
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break;
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case "public":
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value.Public = true;
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break;
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case "must-revalidate":
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value.MustRevalidate = true;
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break;
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case "proxy-revalidate":
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value.ProxyRevalidate = true;
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break;
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case "max-stale":
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value.MaxStale = true;
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t = lexer.Scan ();
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if (t != Token.Type.SeparatorEqual) {
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token_read = true;
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break;
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}
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t = lexer.Scan ();
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if (t != Token.Type.Token)
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return false;
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ts = lexer.TryGetTimeSpanValue (t);
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if (ts == null)
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return false;
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value.MaxStaleLimit = ts;
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break;
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case "max-age":
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case "s-maxage":
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case "min-fresh":
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t = lexer.Scan ();
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if (t != Token.Type.SeparatorEqual) {
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return false;
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}
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t = lexer.Scan ();
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if (t != Token.Type.Token)
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return false;
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ts = lexer.TryGetTimeSpanValue (t);
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if (ts == null)
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return false;
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switch (s.Length) {
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case 7:
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value.MaxAge = ts;
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break;
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case 8:
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value.SharedMaxAge = ts;
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break;
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default:
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value.MinFresh = ts;
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break;
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}
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break;
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case "private":
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case "no-cache":
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if (s.Length == 7) {
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value.Private = true;
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} else {
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value.NoCache = true;
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}
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t = lexer.Scan ();
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if (t != Token.Type.SeparatorEqual) {
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token_read = true;
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break;
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}
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t = lexer.Scan ();
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if (t != Token.Type.QuotedString)
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return false;
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foreach (var entry in lexer.GetQuotedStringValue (t).Split (',')) {
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var qs = entry.Trim ('\t', ' ');
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if (s.Length == 7) {
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value.PrivateHeaders.Add (qs);
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} else {
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value.NoCache = true;
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value.NoCacheHeaders.Add (qs);
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}
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}
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break;
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default:
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string name = lexer.GetStringValue (t);
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string svalue = null;
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t = lexer.Scan ();
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if (t == Token.Type.SeparatorEqual) {
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t = lexer.Scan ();
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switch (t.Kind) {
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case Token.Type.Token:
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case Token.Type.QuotedString:
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svalue = lexer.GetStringValue (t);
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break;
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default:
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return false;
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}
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} else {
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token_read = true;
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}
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value.Extensions.Add (NameValueHeaderValue.Create (name, svalue));
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break;
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}
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if (!token_read)
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t = lexer.Scan ();
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} while (t == Token.Type.SeparatorComma);
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if (t != Token.Type.End)
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return false;
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parsedValue = value;
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return true;
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}
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public override string ToString ()
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{
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const string separator = ", ";
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var sb = new StringBuilder ();
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if (NoStore) {
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sb.Append ("no-store");
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sb.Append (separator);
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}
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if (NoTransform) {
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sb.Append ("no-transform");
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sb.Append (separator);
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}
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if (OnlyIfCached) {
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sb.Append ("only-if-cached");
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sb.Append (separator);
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}
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if (Public) {
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sb.Append ("public");
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sb.Append (separator);
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}
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if (MustRevalidate) {
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sb.Append ("must-revalidate");
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sb.Append (separator);
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}
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if (ProxyRevalidate) {
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sb.Append ("proxy-revalidate");
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sb.Append (separator);
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}
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if (NoCache) {
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sb.Append ("no-cache");
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if (no_cache_headers != null) {
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sb.Append ("=\"");
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no_cache_headers.ToStringBuilder (sb);
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sb.Append ("\"");
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}
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sb.Append (separator);
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}
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if (MaxAge != null) {
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sb.Append ("max-age=");
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sb.Append (MaxAge.Value.TotalSeconds.ToString (CultureInfo.InvariantCulture));
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sb.Append (separator);
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}
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if (SharedMaxAge != null) {
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sb.Append ("s-maxage=");
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sb.Append (SharedMaxAge.Value.TotalSeconds.ToString (CultureInfo.InvariantCulture));
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sb.Append (separator);
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}
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if (MaxStale) {
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sb.Append ("max-stale");
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if (MaxStaleLimit != null) {
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sb.Append ("=");
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sb.Append (MaxStaleLimit.Value.TotalSeconds.ToString (CultureInfo.InvariantCulture));
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}
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sb.Append (separator);
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}
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if (MinFresh != null) {
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sb.Append ("min-fresh=");
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sb.Append (MinFresh.Value.TotalSeconds.ToString (CultureInfo.InvariantCulture));
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sb.Append (separator);
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}
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if (Private) {
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sb.Append ("private");
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if (private_headers != null) {
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sb.Append ("=\"");
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private_headers.ToStringBuilder (sb);
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sb.Append ("\"");
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}
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sb.Append (separator);
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}
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CollectionExtensions.ToStringBuilder (extensions, sb);
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if (sb.Length > 2 && sb[sb.Length - 2] == ',' && sb[sb.Length - 1] == ' ')
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sb.Remove (sb.Length - 2, 2);
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return sb.ToString ();
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}
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}
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}
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