asp中常用的字符串安全处理函数集合(过滤特殊字符等)

复制代码 代码如下:

  '=====================================

  '转换内容,防止意外

  '=====================================

  Function Content_Encode(ByVal t0)

  IF IsNull(t0) Or Len(t0)=0 Then

  Content_Encode=""

  Else

  Content_Encode=Replace(t0,"<","<")

  Content_Encode=Replace(Content_Encode,">",">")

  End IF

  End Function

  '=====================================

  '反转换内容

  '=====================================

  Function Content_Decode(ByVal t0)

  IF IsNull(t0) Or Len(t0)=0 Then

  Content_Decode=""

  Else

  Content_Decode=Replace(t0,"<","<")

  Content_Decode=Replace(Content_Decode,">",">")

  End IF

  End Function

  '=====================================

  '过滤字符

  '=====================================

  Function FilterText(ByVal t0,ByVal t1)

  IF Len(t0)=0 Or IsNull(t0) Or IsArray(t0) Then FilterText="":Exit Function

  t0=Trim(t0)

  Select Case t1

  Case "1"

  t0=Replace(t0,Chr(32)," ")

  t0=Replace(t0,Chr(13),"")

  t0=Replace(t0,Chr(10)&Chr(10),"<br>")

  t0=Replace(t0,Chr(10),"<br>")

  Case "2"

  t0=Replace(t0,Chr(8),"")'回格

  t0=Replace(t0,Chr(9),"")'tab(水平制表符)

  t0=Replace(t0,Chr(10),"")'换行

  t0=Replace(t0,Chr(11),"")'tab(垂直制表符)

  t0=Replace(t0,Chr(12),"")'换页

  t0=Replace(t0,Chr(13),"")'回车 chr(13)&chr(10) 回车和换行的组合

  t0=Replace(t0,Chr(22),"")

  t0=Replace(t0,Chr(32),"")'空格 SPACE

  t0=Replace(t0,Chr(33),"")'!

  t0=Replace(t0,Chr(34),"")'"

  t0=Replace(t0,Chr(35),"")'#

  t0=Replace(t0,Chr(36),"")'$

  t0=Replace(t0,Chr(37),"")'%

  t0=Replace(t0,Chr(38),"")'&

  t0=Replace(t0,Chr(39),"")''

  t0=Replace(t0,Chr(40),"")'(

  t0=Replace(t0,Chr(41),"")')

  t0=Replace(t0,Chr(42),"")'*

  t0=Replace(t0,Chr(43),"")'+

  t0=Replace(t0,Chr(44),"")',

  t0=Replace(t0,Chr(45),"")'-

  t0=Replace(t0,Chr(46),"")'.

  t0=Replace(t0,Chr(47),"")'/

  t0=Replace(t0,Chr(58),"")':

  t0=Replace(t0,Chr(59),"")';

  t0=Replace(t0,Chr(60),"")'<

  t0=Replace(t0,Chr(61),"")'=

  t0=Replace(t0,Chr(62),"")'>

  t0=Replace(t0,Chr(63),"")'?

  t0=Replace(t0,Chr(64),"")'@

  t0=Replace(t0,Chr(91),"")'\

  t0=Replace(t0,Chr(92),"")'\

  t0=Replace(t0,Chr(93),"")']

  t0=Replace(t0,Chr(94),"")'^

  t0=Replace(t0,Chr(95),"")'_

  t0=Replace(t0,Chr(96),"")'`

  t0=Replace(t0,Chr(123),"")'{

  t0=Replace(t0,Chr(124),"")'|

  t0=Replace(t0,Chr(125),"")'}

  t0=Replace(t0,Chr(126),"")'~

  Case Else

  t0=Replace(t0, "&", "&")

  t0=Replace(t0, "'", "'")

  t0=Replace(t0, """", """)

  t0=Replace(t0, "<", "<")

  t0=Replace(t0, ">", ">")

  End Select

  IF Instr(Lcase(t0),"expression")>0 Then

  t0=Replace(t0,"expression","e­xpression", 1, -1, 0)

  End If

  FilterText=t0

  End Function

  '=====================================

  '过滤常见字符及Html

  '=====================================

  Function FilterHtml(ByVal t0)

  IF Len(t0)=0 Or IsNull(t0) Or IsArray(t0) Then FilterHtml="":Exit Function

  IF Len(Sdcms_Badhtml)>0 Then t0=ReplaceText(t0,"<(\/|)("&Sdcms_Badhtml&")", "<$1$2")

  IF Len(Sdcms_BadEvent)>0 Then t0=ReplaceText(t0,"<(.[^>]*)("&Sdcms_BadEvent&")", "<$1$2")

  t0=FilterText(t0,0)

  FilterHtml=t0

  End Function

  Function GotTopic(ByVal t0,ByVal t1)

  IF Len(t0)=0 Or IsNull(t0) Then

  GotTopic=""

  Exit Function

  End IF

  Dim l,t,c, i

  t0=Replace(Replace(Replace(Replace(t0," "," "),""",chr(34)),">",">"),"<","<")

  l=Len(t0)

  t=0

  For I=1 To l

  c=Abs(Asc(Mid(t0,i,1)))

  IF c>255 Then t=t+2 Else t=t+1

  IF t>=t1 Then

  gotTopic=Left(t0,I)&"…"

  Exit For

  Else

  GotTopic=t0

  End IF

  Next

  GotTopic=Replace(Replace(Replace(Replace(GotTopic," "," "),chr(34),"""),">",">"),"<","<")

  End Function

  Function UrlDecode(ByVal t0)

  Dim t1,t2,t3,i,t4,t5,t6

  t1=""

  t2=False

  t3=""

  For I=1 To Len(t0)

  t4=Mid(t0,I,1)

  IF t4="+" Then

  t1=t1&" "

  ElseIF t4="%" Then

  t5=Mid(t0,i+1,2)

  t6=Cint("&H" & t5)

  IF t2 Then

  t2=False

  t1=t1&Chr(Cint("&H"&t3&t5))

  Else

  IF Abs(t6)<=127 then

  t1=t1&Chr(t6)

  Else

  t2=True

  t3=t5

  End IF

  End IF

  I=I+2

  Else

  t1=t1&t4

  End IF

  Next

  UrlDecode=t1

  End Function

  Function CutStr(byVal t0,byVal t1)

  Dim l,t,c,i

  IF IsNull(t0) Then CutStr="":Exit Function

  l=Len(t0)

  t1=Int(t1)

  t=0

  For I=1 To l

  c=Asc(Mid(t0,I,1))

  IF c<0 Or c>255 Then t=t+2 Else t=t+1

  IF t>=t1 Then

  CutStr=Left(t0,I)&"..."

  Exit For

  Else

  CutStr=t0

  End IF

  Next

  End Function

  Function CloseHtml(ByVal t0)

  Dim t1,I,t2,t3,Regs,Matches,J,Match

  Set Regs=New RegExp

  Regs.IgnoreCase=True

  Regs.Global=True

  t1=Array("p","div","span","table","ul","font","b","u","i","h1","h2","h3","h4","h5","h6")

  For I=0 To UBound(t1)

  t2=0

  t3=0

  Regs.Pattern="\<"&t1(I)&"( [^\<\>]+|)\>"

  Set Matches=Regs.Execute(t0)

  For Each Match In Matches

  t2=t2+1

  Next

  Regs.Pattern="\</"&t1(I)&"\>"

  Set Matches=Regs.Execute(t0)

  For Each Match In Matches

  t3=t3+1

  Next

  For j=1 To t2-t3

  t0=t0+"</"&t1(I)&">"

  Next

  Next

  CloseHtml=t0

  End Function