blob: 4092046e2c38e8cf68c26d832a033940d2d7ac81 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
|
using System;
using System.Collections.Generic;
using System.IO;
using System.Net;
namespace MediaBrowser.Model.Dlna
{
public class DefaultLocalPlayer : ILocalPlayer
{
public bool CanAccessFile(string path)
{
return File.Exists(path);
}
public bool CanAccessDirectory(string path)
{
return Directory.Exists(path);
}
public virtual bool CanAccessUrl(string url, bool requiresCustomRequestHeaders)
{
if (requiresCustomRequestHeaders)
{
return false;
}
return CanAccessUrl(url);
}
private readonly Dictionary<string, TestResult> _results = new Dictionary<string, TestResult>(StringComparer.OrdinalIgnoreCase);
private readonly object _resultLock = new object();
private bool CanAccessUrl(string url)
{
var key = GetHostFromUrl(url);
lock (_resultLock)
{
TestResult result;
if (_results.TryGetValue(url, out result))
{
var timespan = DateTime.UtcNow - result.Date;
if (timespan <= TimeSpan.FromMinutes(3))
{
return result.Success;
}
}
}
var canAccess = CanAccessUrlInternal(url);
lock (_resultLock)
{
_results[key] = new TestResult
{
Success = canAccess,
Date = DateTime.UtcNow
};
}
return canAccess;
}
private bool CanAccessUrlInternal(string url)
{
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
request.Timeout = 5000;
request.Method = "HEAD";
try
{
using (HttpWebResponse response = (HttpWebResponse)request.GetResponse())
{
return response.StatusCode == HttpStatusCode.OK;
}
}
catch (WebException)
{
return false;
}
}
protected void ClearUrlTestResultCache()
{
lock (_resultLock)
{
_results.Clear();
}
}
private string GetHostFromUrl(string url)
{
var start = url.IndexOf("://", StringComparison.OrdinalIgnoreCase) + 3;
var len = url.IndexOf('/', start) - start;
return url.Substring(start, len);
}
private class TestResult
{
public bool Success;
public DateTime Date;
}
}
}
|
