Hey guys,
I managed to build in callback support, and I draw your attention to
the implementation here:
http://github.com/opyate/Ken/blob/master/ken-server/src/main/scala/com/opyate/ken/lib/API.scala
Excerpt:
snip
override def dispatch: LiftRules.DispatchPF = {
// modify the returned function to one which converts the result
to JSON
// or a pure LiftResponse (usefull when HTTP response code is not
200)
dispatchMethod.andThen(x =
{
val unboxed = unbox(x)
unboxed match {
case l:LiftResponse = { () = Full(l) }
case _ = { () = {
if (S.param(callback).isEmpty) {
Full(
JsonResponse(
jsonAttributes(
unbox(x)
)
)
)
} else {
Full(
JavaScriptResponse(
JE.JsFunc(S.param(callback).open_!,
jsonAttributes(
unbox(x)
)
).cmd
)
)
}
}
}
}
}
)
}
/snip
So, basically it will handle any callback function name you give it,
because it will just echo it back in the response. (default for jQuery
JSONP is C).
Please be very critical of my code: I'm not doing things properly, or
in a particularly functional manner, but I'm learning :-)
Shameless plug: another little Scala/Lift project of mine which I'd
like feedback on:
http://wiki.github.com/opyate/yauser
Thanks, and happy coding!
Juan
On Oct 6, 6:23 pm, opyate opy...@gmail.com wrote:
Sorry - APIResponse code not borrowed from skittr, but ESME (http://
incubator.apache.org/esme/)
Thus, depending on your call's extension (.json or .xml) you can serve
the response in the required format.
Anyhoo, back to the question... :-)
Thanks,
Juan
On Oct 6, 5:48 pm, Juan M Uys opy...@gmail.com wrote:
Hi Lifters,
I'm building a REST server and a separate stand-alone DHTML client
which won't necessarily be hosted on the same server. Some browsers do
not support cross site Ajax, henceJSONP(i.e. callback support).
My DHTML client now makes calls like the following, using jQuery:
snip
GET /api/version.json?callback=C_1254838856015= HTTP/1.1
Host: localhost:8080
User-Agent: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6; en-US;
rv:1.9.1.3) Gecko/20090824 Firefox/3.5.3
Accept: */*
Accept-Language: en-us,en;q=0.5
Accept-Encoding: gzip,deflate
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
Keep-Alive: 300
Connection: keep-alive
Cookie: JSESSIONID=13k8ykwq2u2w6
/snip
I need to know if I need to build manual support in for the callback:
* grab the token 'C'
* generate a JsCmd named 'C' with my JSON response as parameter (It
will be great if someone can suggest which parts of the Lift API to
use for this)
* send it back to the client (as an extra parameter to the original
JSON, or on it's own?)
It doesn't seem like Lift automatically picks up on ?callback= (it's
not a standard, so - understandable), and my response looks like this:
snip
HTTP/1.1 200 OK
Content-Length: 16
Content-Type: application/json
X-Lift-Version: 1.1-SNAPSHOT
Server: Jetty(6.1.21)
{version: 1}
/snip
The above response is generated by:
snip
def version(): Box[APIResponse] = {
Full(
Right(
Map(version -
Map(version - APIHelper.getParam(api.version))
)
)
)
}
/snip
...where APIResponse is borrowed from TwitterResponse (from the skittr
example).
Another problem I have is that Firefox complains about invalid label
for the above response, so I think wrapping it up in a callback will
fix it.
Here's an answer related to PHP for this
issue:http://stackoverflow.com/questions/790910/jquery-getjson-to-external-...
Thanks,
--
juan
+44 7702 783 956
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