newforms-admin: Merged to [4456]

git-svn-id: http://code.djangoproject.com/svn/django/branches/newforms-admin@4457 bcc190cf-cafb-0310-a4f2-bffc1f526a37

1 files changed, 40 insertions, 0 deletions

diff --git a/django/utils/simplejson/jsonfilter.py b/django/utils/simplejson/jsonfilter.py
new file mode 100644
index 0000000000..d02ae2033a
--- /dev/null
+++ b/django/utils/simplejson/jsonfilter.py
@@ -0,0 +1,40 @@
+from django.utils import simplejson
+import cgi
+
+class JSONFilter(object):
+    def __init__(self, app, mime_type='text/x-json'):
+        self.app = app
+        self.mime_type = mime_type
+
+    def __call__(self, environ, start_response):
+        # Read JSON POST input to jsonfilter.json if matching mime type
+        response = {'status': '200 OK', 'headers': []}
+        def json_start_response(status, headers):
+            response['status'] = status
+            response['headers'].extend(headers)
+        environ['jsonfilter.mime_type'] = self.mime_type
+        if environ.get('REQUEST_METHOD', '') == 'POST':
+            if environ.get('CONTENT_TYPE', '') == self.mime_type:
+                args = [_ for _ in [environ.get('CONTENT_LENGTH')] if _]
+                data = environ['wsgi.input'].read(*map(int, args))
+                environ['jsonfilter.json'] = simplejson.loads(data)
+        res = simplejson.dumps(self.app(environ, json_start_response))
+        jsonp = cgi.parse_qs(environ.get('QUERY_STRING', '')).get('jsonp')
+        if jsonp:
+            content_type = 'text/javascript'
+            res = ''.join(jsonp + ['(', res, ')'])
+        elif 'Opera' in environ.get('HTTP_USER_AGENT', ''):
+            # Opera has bunk XMLHttpRequest support for most mime types
+            content_type = 'text/plain'
+        else:
+            content_type = self.mime_type
+        headers = [
+            ('Content-type', content_type),
+            ('Content-length', len(res)),
+        ]
+        headers.extend(response['headers'])
+        start_response(response['status'], headers)
+        return [res]
+
+def factory(app, global_conf, **kw):
+    return JSONFilter(app, **kw)