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From Rick McGuire <rick...@gmail.com>
Subject Re: Javamail address parsing (again).
Date Fri, 13 Jan 2006 09:54:37 GMT
Dain Sundstrom wrote:
>
> On Jan 12, 2006, at 3:24 PM, Rick McGuire wrote:
>
>> Dain Sundstrom wrote:
>>> On Jan 11, 2006, at 1:17 PM, Bruce Snyder wrote:
>>>
>>>> Is it possible to look at the Sun implementation's source code to
>>>> distinguish enforced vs. ignored rules?
>>>
>>> That would make the code not clean room.
>>>
>>> I propose we ask Sun for a formal definition of the parser for this 
>>> class, and in a parallel track make an effort to try to match their 
>>> bugs.  The code from the second track doesn't have to be perfect, 
>>> but just good enough.  We simply let our users know that our goal 
>>> with the "implement.sun.javamail.bugs=true" code is to emulate the 
>>> sun bugs, and if they find something that produces different results 
>>> for the same text, we consider it a bug.
>> I'm becoming less and less convinced this is a good idea.  So far, 
>> I've found many, many sun bugs in this code where they produce 
>> results that are in conflict with with RFC822.  The API documentation 
>> refers relaxed parsing rules, which says to me there are addresses 
>> that would not be valid under RFC822, but javamail will accept them 
>> based on the type of parsing requested.  I can accept that.
>>
>> However, the great majority of the problems I've found have been 
>> involved with internet addresses that RFC822 says ARE valid, but the 
>> javamail code does not handle them properly.  And there are a few 
>> situations where it appears the authors just chose to punt and say 
>> "yeah, whatever".
>> It appears that the solution is to write hacked code that mostly, 
>> sorta, kinda does what it claims to do, or write a good parser, then 
>> triple the size of the code trying to get all of the Sun bugs to work 
>> properly.
>> Working strictly from the RFC822 spec, I had a fairly nice parser 
>> written that gave very good RFC822 compliance, but things turned 
>> nightmarish when I discovered the sorts of Sun behaviors I had to 
>> insert back in.  I think I've completely rewritten this code about 5 
>> times now, and am getting pretty close to the Sun "relaxed rules".  
>> Inserting some of the real bugs back in to the parsing might pose 
>> similar problems.
>> It really appears that this code somewhat "lost it's way somewhere".  
>> It's serving two purposes that are really at odds with each other.  
>> The first purpose, is to parse any internet address that might appear 
>> in a received message.  For that purpose, the code needs to accept 
>> any valid internet address as defined by RFC822.  The Sun code does 
>> not currently do that, and making the new version "bug compatible" 
>> would also not achieve that.
>>
>> The other purpose of the InternetAddress parser is to process email 
>> addresses entered into applications and perform some validation on 
>> the addresses.  This is where the "relaxed rules" come in to play, 
>> and basically allows internet addresses that are not strictly RFC822 
>> compatible to pass.  Now for those, I'm relatively comfortable that 
>> this can be made compatible.  It is very difficult though, when the 
>> requirement becomes one of being both more and less restrictive at 
>> the same time, with no good definition of the what rules are being used.
>
>
> Ok, how about we say, in "sun bug mode" we will parse all addresses 
> that are valid RFC822 address or are sucessfull parsed by sun's 
> javamail implementation?  This means that valid RFC822 addresses that 
> sun's implementation rejects will be accepted by ours.  We would 
> further would consider it a bug to reject addresses accepted by sun's 
> implementation when in "sun bug mode".
That sounds like a more reasonable goal. 

>
> -dain
>


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