126 lines
4.1 KiB
VB.net
126 lines
4.1 KiB
VB.net
#Region "Microsoft.VisualBasic::44df86484a49147534132f8a0e31b94d, Microsoft.VisualBasic.Core\Net\DomainParser.vb"
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' Author:
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'
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' asuka (amethyst.asuka@gcmodeller.org)
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' xie (genetics@smrucc.org)
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' xieguigang (xie.guigang@live.com)
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'
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' Copyright (c) 2018 GPL3 Licensed
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'
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'
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' GNU GENERAL PUBLIC LICENSE (GPL3)
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'
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'
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' This program is free software: you can redistribute it and/or modify
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' it under the terms of the GNU General Public License as published by
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' the Free Software Foundation, either version 3 of the License, or
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' (at your option) any later version.
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'
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' This program is distributed in the hope that it will be useful,
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' but WITHOUT ANY WARRANTY; without even the implied warranty of
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' MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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' GNU General Public License for more details.
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'
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' You should have received a copy of the GNU General Public License
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' along with this program. If not, see <http://www.gnu.org/licenses/>.
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' /********************************************************************************/
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' Summaries:
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' Module DomainParser
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'
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' Function: Trim, TrimPathAndQuery, (+2 Overloads) TryParse
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'
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'
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' /********************************************************************************/
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#End Region
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Imports Microsoft.VisualBasic.Language
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Namespace Net
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''' <summary>
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''' http://sub.domain.com/somefolder/index.html -> domain.com
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''' somedomain.info -> somedomain.info
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''' http://anotherdomain.org/home -> anotherdomain.org
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''' www.subdomain.anothersubdomain.maindomain.com/something/ -> maindomain.com
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''' </summary>
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Public Module DomainParser
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''' <summary>
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''' 解析错误会返回空字符串
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''' </summary>
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''' <param name="url"></param>
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''' <returns></returns>
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Public Function TryParse(url As String, Optional preserveSubdomain As Boolean = False) As String
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url = Trim(url)
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url = TrimPathAndQuery(url, preserveSubdomain)
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Return url
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End Function
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Public Function TryParse(url As Value(Of String), ByRef DomainName As DomainName) As Boolean
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If String.IsNullOrEmpty(url = TryParse(+url)) Then
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Return False
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End If
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DomainName = New DomainName(+url)
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Return True
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End Function
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Private Function TrimPathAndQuery(url As String, preserveSubdomain As Boolean) As String
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url = url.Split(CChar("/")).First
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If preserveSubdomain Then
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Return url
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End If
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Dim tokens As New List(Of String)(url.Split(CChar(".")))
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If tokens.Count = 2 Then
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Return url
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ElseIf tokens.Count = 1 Then
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Return ""
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End If
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' 剩下的这些事token数量大于等于3的情况
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Dim tld2 As String = tokens(tokens.Count - 2) ' 处理类似于.com.cn这种情况
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' .com.cn
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' .co.uk
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' .ac.cn
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If InStr("co|ac|com|org|net|edu", tld2, CompareMethod.Text) > 0 Then ' .com.cn,,..co.uk的情况，则直接返回
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' 取最后的三个token
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If tokens.Count > 3 Then
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tokens = New List(Of String)(tokens.GetRange(tokens.Count - 3, 3))
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End If
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url = String.Join(".", tokens.ToArray)
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Else
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url = $"{tokens(tokens.Count - 2)}.{tokens(tokens.Count - 1)}"
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End If
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Return url
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End Function
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Private Function Trim(url As String) As String
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For Each protocol As String In {"http://", "file://", "https://", "ftp://"}
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If InStr(url, protocol, CompareMethod.Text) = 1 Then
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url = Mid(url, Len(protocol) + 1)
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Return url
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End If
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Next
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If InStr(url, "mailto://", CompareMethod.Text) = 1 Then
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url = url.Split("@"c).Last
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End If
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Return url
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End Function
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End Module
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End Namespace
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