Re: [Orgmode] Bug: org-make-link-string incorrect with URL containing escapes [6.34a]

[Carsten Dominik]

Hi Geert,

wow, this was awesome!  This is the best kind of bug report I can  
imagine.
Thank you, your patch has been applied.

- Carsten

On Jan 15, 2010, at 2:41 PM, Geert Kloosterman wrote:

> Emacs  : GNU Emacs 23.1.1 (i386-redhat-linux-gnu, GTK+ Version 2.18.3)
> of 2009-12-02 on x86-7.fedora.phx.redhat.com
> Package: Org-mode version 6.34a
>
> Hi all,
>
> When an org link is created from an URL containing a hex escape
> `org-make-link-string' creates a link that ends up corrupted the  
> moment
> it is followed (e.g. using `org-open-at-point').
>
> I've traced this back to `org-link-escape' and `org-link-unescape'.   
> The
> following shows how the hex code "%2B" is converted to a "+" after an
> escaping round trip:
>
>    (org-link-unescape (org-link-escape "http://some.host.com/form?&id=blah%2Bblah 
> "))
>    ==>
>    "http://some.host.com/form?&id=blah+blah";
>
> In my case this small change ended up in a broken URL.
>
> Additionally, when the URL-escape happens to be in lower case (or
> otherwise not present in `org-link-escape-chars') we end up with an
> error:
>
>    (org-link-unescape (org-link-escape "http://some.host.com/form?&id=blah%2bblah 
> "))
>    ==>
>    Debugger entered--Lisp error: (wrong-type-argument characterp nil)
>      char-to-string(nil)
>      ...
>
> When `org-url-encoding-use-url-hexify' is set to `t' we do get a  
> proper
> round trip of the URL containing hex-escapes:
>
>    (setq org-url-encoding-use-url-hexify t)
>    (org-link-unescape (org-link-escape "http://some.host.com/form?&id=blah%2bblah 
> "))
>    ==>
>    "http://some.host.com/form?&id=blah%2bblah";
>
>
> Setting `org-url-encoding-use-url-hexify' does not fix the complete
> problem however: `org-open-at-point' still did not end up with the
> proper URL.   Within `org-open-at-point' there is another call to
> `org-link-escape':
>
>    (org-link-escape path org-link-escape-chars-browser)
>
> This time a mapping table is passed in explicitly (the second  
> argument).
> However, when `org-url-encoding-use-url-hexify' is set,a this mapping
> table isn't used, resulting (again) in a broken URL.
>
> I have attached a patch that fixes the problem: do not use url- 
> hexify in
> `org-link-escape' and `org-link-unescape' when an explicit mapping  
> table
> has been specified.
>
> In summary:
> - the default behaviour of `org-link-escape', with
>   `org-url-encoding-use-url-hexify' set to nil, has some issues with
>   handling URLS which contain url-encoded hex escapes
> - when a mapping table is passed to `org-link-escape' and
>   `org-link-unescape', they should probably not use url-hexify.
>   Patch attached.
>
> Best regards,
> Geert Kloosterman
>
>
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- Carsten