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<p class=MsoNormal>Folks,<o:p></o:p></p>

<p class=MsoNormal>&nbsp;<o:p></o:p></p>

<p class=MsoNormal>The current encoder().encodeForURL(String data) is really
meant for URL <i>Parameter</i> encoding (as part of XSS prevention). If you URL
encode an entire URL it will break the link you are trying to render.<o:p></o:p></p>

<p class=MsoNormal>&nbsp;<o:p></o:p></p>

<p class=MsoNormal>I have an idea for URL encoding that would support output
encoding a <i>complete untrusted URL</i> if it was valid. This may be overkill,
but I do not trust regular expressions for URL validation. There are so many
edge cases that I think we should support&#8230;.<o:p></o:p></p>

<p class=MsoNormal>&nbsp;<o:p></o:p></p>

<p class=MsoNormal>First we need a good ESAPI URL validation function for
input. I suggestion this over a RegEx:<o:p></o:p></p>

<p class=MsoNormal>&nbsp;<o:p></o:p></p>

<p class=MsoNormal><b><u>Validate URL pseudo-code:</u></b><o:p></o:p></p>

<p class=MsoNormal>&nbsp;<o:p></o:p></p>

<p class=MsoNormal><span style='font-size:8.0pt;font-family:"Courier New"'>String
userURLString = request.getParameter(&#8220;userURL&#8221;);</span><o:p></o:p></p>

<p class=MsoNormal><span style='font-size:8.0pt;font-family:"Courier New"'>try
{</span><o:p></o:p></p>

<p class=MsoNormal><span style='font-size:8.0pt;font-family:"Courier New"'>&nbsp;&nbsp;&nbsp;
</span><o:p></o:p></p>

<p class=MsoListParagraph style='margin-left:42.0pt;text-indent:-.25in;
mso-list:l1 level1 lfo2'><![if !supportLists]><span style='mso-list:Ignore'>1)<span
style='font:7.0pt "Times New Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></span><![endif]><span
style='font-size:8.0pt;font-family:"Courier New"'>assert that userURLString
starts with http or https (or other configurable schemes) in a case sensitive
way</span><o:p></o:p></p>

<p class=MsoListParagraph style='margin-left:42.0pt;text-indent:-.25in;
mso-list:l1 level1 lfo2'><![if !supportLists]><span style='mso-list:Ignore'>2)<span
style='font:7.0pt "Times New Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></span><![endif]><span
style='font-size:8.0pt;font-family:"Courier New"'>URL url = new
URL(userURLString);</span><o:p></o:p></p>

<p class=MsoNormal><span style='font-size:8.0pt;font-family:"Courier New"'>}
catch (MalformedURLException e) {<br>
&nbsp; &nbsp; // the URL is not in a valid form<br>
} </span><o:p></o:p></p>

<p class=MsoNormal>&nbsp;<o:p></o:p></p>

<p class=MsoNormal>Next we need a complete URL encoder. If the URL is not
valid, return an exception (Ed!) or a blank string?<o:p></o:p></p>

<p class=MsoNormal>&nbsp;<o:p></o:p></p>

<p class=MsoNormal><b><u>Encode URL pseudo-code: </u></b><o:p></o:p></p>

<p class=MsoNormal>&nbsp;<o:p></o:p></p>

<p class=MsoNormal><span style='font-size:8.0pt;font-family:"Courier New"'>String
userURLString = request.getParameter(&#8220;userURL&#8221;);</span><o:p></o:p></p>

<p class=MsoNormal><span style='font-size:8.0pt;font-family:"Courier New"'>URL
url = null;</span><o:p></o:p></p>

<p class=MsoNormal><span style='font-size:8.0pt;font-family:"Courier New"'>try
{</span><o:p></o:p></p>

<p class=MsoNormal><span style='font-size:8.0pt;font-family:"Courier New"'>&nbsp;&nbsp;&nbsp;
</span><o:p></o:p></p>

<p class=MsoListParagraph style='margin-left:42.0pt;text-indent:-.25in;
mso-list:l0 level1 lfo4'><![if !supportLists]><span style='mso-list:Ignore'>1)<span
style='font:7.0pt "Times New Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></span><![endif]><span
style='font-size:8.0pt;font-family:"Courier New"'>assert that userURLString
starts with http or https in a case sensitive way</span><o:p></o:p></p>

<p class=MsoListParagraph style='margin-left:42.0pt;text-indent:-.25in;
mso-list:l0 level1 lfo4'><![if !supportLists]><span style='mso-list:Ignore'>2)<span
style='font:7.0pt "Times New Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></span><![endif]><span
style='font-size:8.0pt;font-family:"Courier New"'>url = new URL(userURLString);</span><o:p></o:p></p>

<p class=MsoNormal style='margin-left:24.0pt'><span style='font-size:8.0pt;
font-family:"Courier New"'>&nbsp;</span><o:p></o:p></p>

<p class=MsoNormal><span style='font-size:8.0pt;font-family:"Courier New"'>}
catch (MalformedURLException e) {<br>
&nbsp; &nbsp; // the URL is not in a valid form<br>
} </span><o:p></o:p></p>

<p class=MsoListParagraph style='margin-left:42.0pt;text-indent:-.25in;
mso-list:l0 level1 lfo4'><![if !supportLists]><span style='mso-list:Ignore'>3)<span
style='font:7.0pt "Times New Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></span><![endif]><span
style='font-size:8.0pt;font-family:"Courier New"'>If URL is valid<span
style='color:#1F497D'> &lt;scheme&gt;://&lt;path&gt;</span></span><o:p></o:p></p>

<p class=MsoListParagraph style='margin-left:78.0pt;text-indent:-.25in;
mso-list:l0 level2 lfo4'><![if !supportLists]><span style='mso-list:Ignore'>a.<span
style='font:7.0pt "Times New Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></span><![endif]><span
style='font-size:8.0pt;font-family:"Courier New"'>rip out the scheme</span><o:p></o:p></p>

<p class=MsoListParagraph style='margin-left:78.0pt;text-indent:-.25in;
mso-list:l0 level2 lfo4'><![if !supportLists]><span style='mso-list:Ignore'>b.<span
style='font:7.0pt "Times New Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></span><![endif]><span
style='font-size:8.0pt;font-family:"Courier New"'>rip out the path</span><o:p></o:p></p>

<p class=MsoListParagraph style='margin-left:78.0pt;text-indent:-.25in;
mso-list:l0 level2 lfo4'><![if !supportLists]><span style='mso-list:Ignore'>c.<span
style='font:7.0pt "Times New Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></span><![endif]><span
style='font-size:8.0pt;font-family:"Courier New"'>rip out the URL parameters</span><o:p></o:p></p>

<p class=MsoListParagraph style='margin-left:78.0pt;text-indent:-.25in;
mso-list:l0 level2 lfo4'><![if !supportLists]><span style='mso-list:Ignore'>d.<span
style='font:7.0pt "Times New Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></span><![endif]><span
style='font-size:8.0pt;font-family:"Courier New"'>re-assemble the url</span><o:p></o:p></p>

<p class=MsoListParagraph style='margin-left:78.0pt;text-indent:-.25in;
mso-list:l0 level2 lfo4'><![if !supportLists]><span style='mso-list:Ignore'>e.<span
style='font:7.0pt "Times New Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></span><![endif]><span
style='font-size:8.0pt;font-family:"Courier New"'>Use ESAPI to URL encode</span><span
style='font-size:10.0pt;font-family:"Courier New"'> all get parameters during
url assembly</span><span style='color:#1F497D'><o:p></o:p></span></p>

<p class=MsoNormal>&nbsp;<o:p></o:p></p>

<p class=MsoNormal>Thoughts?<o:p></o:p></p>

<p class=MsoNormal>- Jim<o:p></o:p></p>

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