[wp-hackers] Building a JSON API style plugin

[Andrew Spratley]

Does this help http://wordpress.org/extend/plugins/json-api/ ?

On Wed, Nov 2, 2011 at 7:38 PM, Otto <otto at ottodestruct.com> wrote:
> On Wed, Nov 2, 2011 at 10:51 AM, Tom Barrett <tcbarrett at gmail.com> wrote:
>> I want to add some trivial JSON requests to a site. I'm wondering if there
>> is a best practice for this. I have various thoughts on this, but nothing
>> terribly concrete yet.
>>
>> 1. Is template_redirect the best hook point?
>> 2. If I don't want to use the query string (e.g. /api/ticket/1234.json)
>> will I get caught up in the rewrite system?
>
> For one-offs and testing and such, I generally implement stuff like
> this as a Page Template instead. Then I can create a new Page with the
> URL I want, hook it to that template, and you're off and running with
> very little code.
>
> If it was something I was putting in a plugin or releasing, then
> template_redirect is where I'd generally put it, with some additional
> rewrite rules to make the URLs pretty. This is fairly easy to do,
> actually. Say you wanted to have the URLs look like /ticket/12345:
>
> add_action('init','ticket_add_rewrite');
> function ticket_add_rewrite() {
>       global $wp;
>       $wp->add_query_var('ticket');
>       add_rewrite_rule('ticket/([0-9]+)/?$',
> 'index.php?ticket=$matches[1]', 'top');
> }
>
> Then you visit the permalinks page to make it rebuild the rules, and
> voila. You'll get the ticket number with get_query_var('ticket'). So
> you'd change to something like this:
>
> add_action( 'template_redirect', 'get_ticket' );
> function get_ticket(){
>  $ticket_num = get_query_var('ticket');
>  if ( empty($ticket_num) ) return;
>  $ticket = get_ticket_details($ticket_num);
>  header('Content-Type: application/json');
>  echo json_encode($ticket);
>  exit(0);
> }
>
> (note, code written on the fly, might be buggy or not work at all, YMMV)
>
> -Otto
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