def _parse_category_header(self, header_value):
categories = []
category_headers = HttpCategoryHeaders()
category_headers.parse(header_value)
for term, attributes in category_headers.all():
param = {}
for k, v in attributes:
param[k] = v
# Category scheme
try:
scheme = param['scheme']
except KeyError:
raise HttpHeaderError('Category scheme not specified')
# Category, Kind or Mixin?
t = param.get('class')
cls = Category
if t and t.lower() == 'kind':
cls = Kind
elif t and t.lower() == 'mixin':
cls = Mixin
elif not t and param.get('location'):
cls = Mixin
# Related Kind/Mixin
try:
t = param['rel']
r_scheme, r_term = t.split('#', 1)
r_scheme += '#'
related = cls(r_term, r_scheme)
except KeyError, ValueError:
related = None
# Supported attributes (mutable)
try:
attributes = []
SPEC_PLAIN = re.compile(r'^([a-z0-9._-]+)$')
SPEC_PROPS = re.compile(r'^([a-z0-9._-]+){(.*)}$')
for attr_spec in param['attributes'].split():
attr_kwargs = {}
m = SPEC_PLAIN.match(attr_spec)
if not m:
m = SPEC_PROPS.match(attr_spec)
if not m:
raise HttpHeaderError('%s: Invalid attribute specification in Category header' % attr_spec)
else:
for prop in m.groups()[1].split():
if prop == 'required':
attr_kwargs['required'] = True
if prop == 'immutable':
attr_kwargs['mutable'] = False
attributes.append(Attribute(m.groups()[0], **attr_kwargs))
except KeyError, IndexError:
attributes = None
def category_headers(self, obj):
# Category headers
category_headers = HttpCategoryHeaders()
for category in obj.categories:
params = []
params.append(('scheme', category.scheme))
cat_class = category.__class__.__name__.lower()
# FIXME: this is a bug in the spec, fix it?
if cat_class == 'category': cat_class = 'action'
params.append(('class', cat_class))
if category.title:
params.append(('title', category.title))
if 'category_discovery' in obj.render_flags:
if category.related:
params.append(('rel', category.related))
if category.attributes:
attr_defs = []
for attr in category.unique_attributes.itervalues():
attr_props = []
if not attr.mutable and not attr.required:
attr_props.append('immutable')
elif attr.required:
attr_props.append('required')
attr_def = attr.name
if attr_props:
attr_def += '{%s}' % ' '.join(attr_props)
attr_defs.append(attr_def)
params.append(('attributes', ' '.join(attr_defs)))
if hasattr(category, 'actions') and category.actions:
params.append(
('actions',
' '.join([str(cat) for cat in category.actions])))
if hasattr(category, 'location') and category.location:
params.append(('location',
obj.translator.url_build(category.location,
path_only=True)))
category_headers.add(category.term, params)
return category_headers
