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Overview
Comment:Improve %string() to escape < so that </script> does not cause problems in embedded javascript. Improve %html() to escape " and \ to avoid problems with HTML used inside a javascript string.
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SHA3-256: 1e5ec777a7b87cb51eedff9161414697769616fdc0bdddad2e082ed198cf0a88
User & Date: drh 2018-03-09 17:49:38
Context
2018-03-28
20:25
Update the built-in SQLite to the first 3.23.0 beta. check-in: 127706d944 user: drh tags: trunk
2018-03-09
17:49
Improve %string() to escape < so that </script> does not cause problems in embedded javascript. Improve %html() to escape " and \ to avoid problems with HTML used inside a javascript string. check-in: 1e5ec777a7 user: drh tags: trunk
2018-03-02
14:02
Add the download.md document. check-in: 88695e2d91 user: drh tags: trunk
Changes
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Changes to tests/test01.tcl. 

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    <li><p><a href='%url($B)/globals'>TCL global variables</a>
    <li><p><a href='%url%($BX(y))%/csptest'>Content Security Policy</a>
    <li><p><a href='%url($B)/fileupload'>File Upload
    Using multipart/form-data</a>
    <li><p><a href='%url($B)/self'>The source code to this script</a>
  }
  set x "%string(...)"
  set v abc'def\"ghi\\jkl
  wapp-subst {<li>%html($x) substitution test: "%string%($v)%"\n}
  wapp "</ol>"
  if {[wapp-param-exists showenv]} {
    wapp-page-env
  }
  wapp-trim {
    <p>The creator of Wapp:<br>
................................................................................
    <p>This page uses wapp-allow-xorigin-params so that new
       query parameters may be added manually to the URL.</p>
    <pre>%html([wapp-debug-env])</pre>
  }
}
proc wapp-page-env {} {
  global wapp

  wapp-set-cookie env-cookie simple
  wapp "<h1>Wapp Environment</h1>\n"
  wapp-unsafe "<form method='GET' action='[wapp-param SELF_URL]'>\n"
  wapp "<input type='checkbox' name='showhdr'"
  if {[wapp-param-exists showhdr]} {
    wapp " checked"
  }
................................................................................
  foreach var [lsort [wapp-param-list]] {
    if {[string index $var 0]=="." &&
         ($var!=".header" || ![wapp-param-exists showhdr])} continue
    wapp-subst {%html($var) = %html([list [wapp-param $var]])\n}
  }
  wapp "</pre>"
  wapp-unsafe "<p><a href='[wapp-param BASE_URL]/'>Home</a></p>\n"








}
proc wapp-page-fullenv {} {
  wapp-set-cookie env-cookie full
  wapp "<h1>Wapp Full Environment</h1>\n"
  wapp-unsafe "<form method='POST' action='[wapp-param SELF_URL]'>\n"
  wapp "<input type='checkbox' name='var1'"
  if {[wapp-param-exists showhdr]} {








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    <li><p><a href='%url($B)/globals'>TCL global variables</a>
    <li><p><a href='%url%($BX(y))%/csptest'>Content Security Policy</a>
    <li><p><a href='%url($B)/fileupload'>File Upload
    Using multipart/form-data</a>
    <li><p><a href='%url($B)/self'>The source code to this script</a>
  }
  set x "%string(...)"
  set v abc'def\"ghi\\jkl</script>
  wapp-subst {<li>%html($x) substitution test: "%string%($v)%"\n}
  wapp "</ol>"
  if {[wapp-param-exists showenv]} {
    wapp-page-env
  }
  wapp-trim {
    <p>The creator of Wapp:<br>
................................................................................
    <p>This page uses wapp-allow-xorigin-params so that new
       query parameters may be added manually to the URL.</p>
    <pre>%html([wapp-debug-env])</pre>
  }
}
proc wapp-page-env {} {
  global wapp
  wapp-allow-xorigin-params
  wapp-set-cookie env-cookie simple
  wapp "<h1>Wapp Environment</h1>\n"
  wapp-unsafe "<form method='GET' action='[wapp-param SELF_URL]'>\n"
  wapp "<input type='checkbox' name='showhdr'"
  if {[wapp-param-exists showhdr]} {
    wapp " checked"
  }
................................................................................
  foreach var [lsort [wapp-param-list]] {
    if {[string index $var 0]=="." &&
         ($var!=".header" || ![wapp-param-exists showhdr])} continue
    wapp-subst {%html($var) = %html([list [wapp-param $var]])\n}
  }
  wapp "</pre>"
  wapp-unsafe "<p><a href='[wapp-param BASE_URL]/'>Home</a></p>\n"
  wapp-trim {<h1>Using &#37;string</h1>}
  wapp "<pre>\n"
  foreach var [lsort [wapp-param-list]] {
    if {[string index $var 0]=="." &&
         ($var!=".header" || ![wapp-param-exists showhdr])} continue
    wapp-subst {%html($var) = %string([list [wapp-param $var]])\n}
  }
  wapp "</pre>"
}
proc wapp-page-fullenv {} {
  wapp-set-cookie env-cookie full
  wapp "<h1>Wapp Full Environment</h1>\n"
  wapp-unsafe "<form method='POST' action='[wapp-param SELF_URL]'>\n"
  wapp "<input type='checkbox' name='var1'"
  if {[wapp-param-exists showhdr]} {

Changes to wapp.tcl. 

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#    wappInt-enc-url            Escape text so that it is safe to pass as an
#                               argument to href= and src= attributes in HTML.
#
#    wappInt-enc-qp             Escape text so that it is safe to use as the
#                               value of a query parameter in a URL or in
#                               post data or in a cookie.
#
#    wappInt-enc-string         Escape ", ', and \ for using inside of a
#                               javascript string literal.


#
#    wappInt-enc-unsafe         Perform no encoding at all.  Unsafe.
#
proc wappInt-enc-html {txt} {
  return [string map {& &amp; < &lt; > &gt;} $txt]
}
proc wappInt-enc-unsafe {txt} {
  return $txt
}
proc wappInt-enc-url {s} {
  if {[regsub -all {[^-{}@~?=#_.:/a-zA-Z0-9]} $s {[wappInt-%HHchar {&}]} s]} {
    set s [subst -novar -noback $s]
................................................................................
  }
  if {[regsub -all {[{}]} $s {[wappInt-%HHchar \\&]} s]} {
    set s [subst -novar -noback $s]
  }
  return $s
}
proc wappInt-enc-string {s} {
  return [string map {\\ \\\\ \" \\\" ' \\'} $s]
}

# This is a helper routine for wappInt-enc-url and wappInt-enc-qp.  It returns
# an appropriate %HH encoding for the single character c.  If c is a unicode
# character, then this routine might return multiple bytes:  %HH%HH%HH
#
proc wappInt-%HHchar {c} {








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#    wappInt-enc-url            Escape text so that it is safe to pass as an
#                               argument to href= and src= attributes in HTML.
#
#    wappInt-enc-qp             Escape text so that it is safe to use as the
#                               value of a query parameter in a URL or in
#                               post data or in a cookie.
#
#    wappInt-enc-string         Escape ", ', \, and < for using inside of a
#                               javascript string literal.  The < character
#                               is escaped to prevent "</script>" from causing
#                               problems in embedded javascript.
#
#    wappInt-enc-unsafe         Perform no encoding at all.  Unsafe.
#
proc wappInt-enc-html {txt} {
  return [string map {& &amp; < &lt; > &gt; \" &quot; \\ &#92;} $txt]
}
proc wappInt-enc-unsafe {txt} {
  return $txt
}
proc wappInt-enc-url {s} {
  if {[regsub -all {[^-{}@~?=#_.:/a-zA-Z0-9]} $s {[wappInt-%HHchar {&}]} s]} {
    set s [subst -novar -noback $s]
................................................................................
  }
  if {[regsub -all {[{}]} $s {[wappInt-%HHchar \\&]} s]} {
    set s [subst -novar -noback $s]
  }
  return $s
}
proc wappInt-enc-string {s} {
  return [string map {\\ \\\\ \" \\\" ' \\' < \\u003c} $s]
}

# This is a helper routine for wappInt-enc-url and wappInt-enc-qp.  It returns
# an appropriate %HH encoding for the single character c.  If c is a unicode
# character, then this routine might return multiple bytes:  %HH%HH%HH
#
proc wappInt-%HHchar {c} {

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