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from Component import Component, ServletComponent
from json import jsonToObj, objToJson
from paste import httpexceptions
from cStringIO import StringIO
import traceback
from paste import wsgilib
class JSONServletComponent(ServletComponent):
_servletMethods = ['jsonaction', 'jsonjs']
def __init__(self, jsolaitURL='jsolait',
libURL='',
baseConfig=None,
jsonMethods=()):
self.baseConfig = baseConfig
self.jsolaitURL = jsolaitURL
self.libURL = libURL
self._declaredJsonMethods = list(jsonMethods)
def actions(self):
return ['jsonaction']
def jsonMethods(self):
all_methods = self._declaredJsonMethods[:]
all_methods.extend(self.optionalMethod('jsonMethods', []))
return all_methods
def jsonaction(self):
request_body = self.servlet().request().rawInput().read()
req_data = jsonToObj(request_body)
req_id = req_data['id']
try:
method_name = req_data['method']
if method_name not in self.jsonMethods():
raise HTTPForbidden(
"The method %s is not public" % method_name)
method = getattr(self.servlet(), method_name)
result = method(*req_data['params'])
json_res = {'id': req_id, 'result': result, 'error': None}
json_res = objToJson(json_res)
except Exception, e:
if isinstance(e, httpexceptions.HTTPException):
raise
out = StringIO()
# @@: I should also report this error
traceback.print_exc(file=out)
json_res = {'id': req_id, 'result': None,
'error': out.getvalue()}
json_res = objToJson(json_res)
self.servlet().response().write(json_res)
self.servlet().setView(None)
def jsonjs(self):
env = self.servlet().request().environ()
jsolaitURL = self.jsolaitURL
lib = self.libURL
here = wsgilib.construct_url(env, False)
here += '?_action_=jsonaction';
if self.baseConfig:
app_base = env['%s.base_url' % self.baseConfig]
if not jsolaitURL.startswith('/'):
jsolaitURL = app_base + '/' + jsolaitURL
if not lib.startswith('/'):
lib = app_base + '/' + lib
text = (r'''
<script type="text/javascript" src="%(jsolaitURL)s/init.js"></script>
<script type="text/javascript">
jsolait.baseURL = "%(lib)s";
jsolait.libURL = "%(jsolaitURL)s";
</script>
<script type="text/javascript" src="%(jsolaitURL)s/lib/urllib.js"></script>
<script type="text/javascript" src="%(jsolaitURL)s/lib/jsonrpc.js"></script>
<script type="text/javascript" src="%(jsolaitURL)s/lib/lang.js"></script>
<script type="text/javascript">
jsonrpc = importModule("jsonrpc");
var servlet = new jsonrpc.ServiceProxy(%(here)r, %(methods)r);
</script>
'''
% {'jsolaitURL': jsolaitURL,
'lib': lib,
'here': here,
'methods': self.jsonMethods()})
return text
class JSONComponent(Component):
_componentClass = JSONServletComponent
"""
<script type="text/javascript" src="%(jsolaitURL)s/lib/jsolait.js"></script>
<script type="text/javascript">
//jsolait = importModule("jsolait");
//jsolait.baseURL = %jsolaitURLr;
//jsolait.libURL = %(lib)r;
</script>
"""
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