1 files changed, 89 insertions, 0 deletions
diff --git a/djangorestframework/parsers.py b/djangorestframework/parsers.py
new file mode 100644
index 00000000..a656e2eb
--- /dev/null
+++ b/djangorestframework/parsers.py
@@ -0,0 +1,89 @@
+from djangorestframework.response import status, ResponseException
+
+try:
+    import json
+except ImportError:
+    import simplejson as json
+
+# TODO: Make all parsers only list a single media_type, rather than a list
+
+class BaseParser(object):
+    """All parsers should extend BaseParser, specifing a media_type attribute,
+    and overriding the parse() method."""
+
+    media_type = None
+
+    def __init__(self, resource):
+        """Initialise the parser with the Resource instance as state,
+        in case the parser needs to access any metadata on the Resource object."""
+        self.resource = resource
+    
+    def parse(self, input):
+        """Given some serialized input, return the deserialized output.
+        The input will be the raw request content body.  The return value may be of
+        any type, but for many parsers/inputs it might typically be a dict."""
+        return input
+
+
+class JSONParser(BaseParser):
+    media_type = 'application/json'
+
+    def parse(self, input):
+        try:
+            return json.loads(input)
+        except ValueError, exc:
+            raise ResponseException(status.HTTP_400_BAD_REQUEST, {'detail': 'JSON parse error - %s' % str(exc)})
+
+
+class XMLParser(BaseParser):
+    media_type = 'application/xml'
+
+
+class FormParser(BaseParser):
+    """The default parser for form data.
+    Return a dict containing a single value for each non-reserved parameter.
+    """
+    
+    media_type = 'application/x-www-form-urlencoded'
+
+    def parse(self, input):
+        # The FormParser doesn't parse the input as other parsers would, since Django's already done the
+        # form parsing for us.  We build the content object from the request directly.
+        request = self.resource.request
+
+        if request.method == 'PUT':
+            # Fix from piston to force Django to give PUT requests the same
+            # form processing that POST requests get...
+            #
+            # Bug fix: if _load_post_and_files has already been called, for
+            # example by middleware accessing request.POST, the below code to
+            # pretend the request is a POST instead of a PUT will be too late
+            # to make a difference. Also calling _load_post_and_files will result 
+            # in the following exception:
+            #   AttributeError: You cannot set the upload handlers after the upload has been processed.
+            # The fix is to check for the presence of the _post field which is set 
+            # the first time _load_post_and_files is called (both by wsgi.py and 
+            # modpython.py). If it's set, the request has to be 'reset' to redo
+            # the query value parsing in POST mode.
+            if hasattr(request, '_post'):
+                del request._post
+                del request._files
+            
+            try:
+                request.method = "POST"
+                request._load_post_and_files()
+                request.method = "PUT"
+            except AttributeError:
+                request.META['REQUEST_METHOD'] = 'POST'
+                request._load_post_and_files()
+                request.META['REQUEST_METHOD'] = 'PUT'
+
+        # Strip any parameters that we are treating as reserved
+        data = {}
+        for (key, val) in request.POST.items():
+            if key not in self.resource.RESERVED_FORM_PARAMS:
+                data[key] = val
+        
+        return data
+
+