[gdal-dev] CPLEscapeString URL - encoding characters that don't need to be encoded

[Timothy Astle]

Yes, that could be possible.

Aweb server should try to URL decode anything that has been encoded, 
that is, any %xx token.

But I have hit one server that doesn't do this, and that's why I'm here. 
It doesn't seem to be doing any decoding. :(


Tim


On 18/06/2014 10:18 AM, Even Rouault wrote:
> Le mercredi 18 juin 2014 14:47:47, Timothy Astle a écrit :
>> I was thinking something like the following:
>>
>>                if( (pszInput[iIn] >= 'a' && pszInput[iIn] <= 'z')
>>
>>                    || (pszInput[iIn] >= 'A' && pszInput[iIn] <= 'Z')
>>                    || (pszInput[iIn] >= '0' && pszInput[iIn] <= '9')
>>
>> -                || pszInput[iIn] == '_' || pszInput[iIn] == '.' )
>> +                || pszInput[iIn] == '$' && pszInput[iIn] == '-'
>> +                || pszInput[iIn] == '_' || pszInput[iIn] == '.'
>> +                || pszInput[iIn] == '+' && pszInput[iIn] == '!'
>> +                || pszInput[iIn] == '*' && pszInput[iIn] == '\''
>> +                || pszInput[iIn] == '(' && pszInput[iIn] == ')'
>> +                || pszInput[iIn] == '"' && pszInput[iIn] == ',' )
>>
>> which follows the list of special characters that may be used unencoded
>> within a URL.
>>
>>      Thus, only alphanumerics, the special characters "$-_.+!*'(),", and
>>      reserved characters used for their reserved purposes may be used
>>      unencoded within a URL.
>>
>> That list is mutually exclusive from the list you cited as being a
>> concern, which I agree with.
> Looks reasonable, although I anticipate we might hit server bugs if changing
> that...
>
>>
>> Tim
>>
>> On 17/06/2014 6:24 PM, Even Rouault wrote:
>>> Le lundi 16 juin 2014 14:20:59, Timothy Astle a écrit :
>>>> Hi all,
>>>>
>>>> Does anyone know why CPLEscapeString
>>>> (https://svn.osgeo.org/gdal/trunk/gdal/port/cpl_string.cpp) character
>>>> encodes characters that are valid as-is according to
>>>> http://www.ietf.org/rfc/rfc1738.txt?
>>>>
>>>> I just hit a situation where I noticed the WMS driver is converting
>>>> hyphens to %2D for layer names.  The 3rd party server doesn't handle it
>>>> (but it should) and this caught my attention.
>>>>
>>>> Any thoughts?  Is it just a case where a patch would be welcome?
>>> Tim,
>>>
>>> What would your patch do ? Implement the following from RFC1738 ? :
>>>
>>> "Thus, only alphanumerics, the special characters "$-_.+!*'(),", and
>>> reserved characters used for their reserved purposes may be used
>>> unencoded within a URL."
>>>
>>> Well, actually I think it should still encode the reserved characters
>>> (";",
>>>
>>>    "/", "?", ":", "@", "=" and "&"), since valid use cases of
>>>    CPLEscapeString(,
>>>
>>> CPLES_URL) might be do make sure that they are encoded.
>>>
>>> Even

-- 
Tim Astle
Development Manager
Web Technologies

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