# Copyright (c) 2004 Divmod.
# See LICENSE for details.
import warnings
from zope.interface import implements
from twisted.python import components
from nevow.util import Deferred,DeferredList,getPOSTCharset
from nevow import inevow,tags
from nevow.context import WovenContext
import formless
from formless.formutils import enumerate
from formless import iformless
faketag = tags.html()
def exceptblock(f, handler, exception, *a, **kw):
try:
result = f(*a, **kw)
except exception, e:
return handler(e)
if isinstance(result, Deferred):
def _(fail):
fail.trap(exception)
return handler(fail.value)
return result.addErrback(_)
else:
return result
class ProcessGroupBinding(components.Adapter):
implements(iformless.IInputProcessor)
def process(self, context, boundTo, data):
## THE SPEC: self.original.typedValue.iface.__spec__
spec = self.original.typedValue.iface.__spec__
resultList = [None] * len(spec)
message = ''
results = {}
failures = {}
waiters = []
for i, sub in enumerate(spec):
def _process():
# note, _process only works because it is called IMMEDIATELY
# in the loop, watch out for confusing behavior if it is called
# later when 'i' has changed
resulti = resultList[i] = iformless.IInputProcessor(sub).process(context, boundTo, data, autoConfigure = False)
# Merge the valid value in case another fails
results.update(resulti)
def _except(e):
errors = context.locate(iformless.IFormErrors)
# XXX: It seems like this should only ever be called with a WovenContext
# XXX: if it's using context.key. But it seems that it's only ever called with
# XXX: a PageContext, so context.key used to be '' always?
errors.updateErrors(getattr(context, 'key', ''), e.errors)
pf = e.partialForm
err = e.errors
msg = e.formErrorMessage
## Set an error message for this group of bindings
errors.setError(getattr(context, 'key', ''), msg)
# Merge the failed value
results.update(pf)
# Merge the error message
failures.update(e.errors)
maybe = exceptblock(_process, _except, formless.ValidateError)
if isinstance(maybe, Deferred):
waiters.append(maybe)
def _finish(ignored):
if not failures:
for specobj, result in zip(spec, resultList):
specobj.configure(boundTo, result)
else:
#print "There were validation errors. The errors were: ", failures
raise formless.ValidateError(failures, 'Error:', results)
return DeferredList(waiters).addBoth(_finish)
class ProcessMethodBinding(components.Adapter):
implements(iformless.IInputProcessor)
def process(self, context, boundTo, data, autoConfigure = True):
"""Knows how to process a dictionary of lists
where the dictionary may contain a key with the same
name as some of the arguments to the MethodBinding
instance.
"""
typedValue = self.original.typedValue
results = {}
failures = {}
if data.has_key('----'):
## ---- is the "direct object", the one argument you can specify using the command line without saying what the argument name is
data[typedValue.arguments[0].name] = data['----']
del data['----']
for binding in typedValue.arguments:
name = binding.name
try:
context = WovenContext(context, faketag)
context.remember(binding, iformless.IBinding)
results[name] = iformless.IInputProcessor(binding.typedValue).process(context, boundTo, data.get(name, ['']))
except formless.InputError, e:
results[name] = data.get(name, [''])[0]
failures[name] = e.reason
if failures:
#print "There were validation errors. The errors were: ", failures
raise formless.ValidateError(failures, "Error:", results)
if autoConfigure:
def _except(e):
failures[''] = e.reason # self.original.name
raise formless.ValidateError(failures, e.reason, results)
return exceptblock(self.original.configure, _except, formless.InputError,
boundTo, results)
return results
class ProcessPropertyBinding(components.Adapter):
implements(iformless.IInputProcessor)
def process(self, context, boundTo, data, autoConfigure = True):
"""Knows how to process a dictionary of lists
where the dictionary may contain a key with the
same name as the property binding's name.
"""
binding = self.original
context.remember(binding, iformless.IBinding)
result = {}
try:
result[binding.name] = iformless.IInputProcessor(binding.typedValue).process(context, boundTo, data.get(binding.name, ['']))
except formless.InputError, e:
result[binding.name] = data.get(binding.name, [''])
raise formless.ValidateError({binding.name: e.reason}, e.reason, result)
if autoConfigure:
try:
return self.original.configure(boundTo, result)
except formless.InputError, e:
result[binding.name] = data.get(binding.name, [''])
raise formless.ValidateError({binding.name: e.reason}, e.reason, result)
return result
class ProcessTyped(components.Adapter):
implements(iformless.IInputProcessor)
def process(self, context, boundTo, data):
"""data is a list of strings at this point
"""
typed = self.original
val = data[0]
if typed.unicode:
try:
val = val.decode(getPOSTCharset(context), 'replace')
except LookupError:
val = val.decode('utf-8', 'replace')
if typed.strip:
val = val.strip()
if val == '' or val is None:
if typed.required:
raise formless.InputError(typed.requiredFailMessage)
else:
return typed.null
try:
return typed.coerce(val, boundTo)
except TypeError, e:
warnings.warn('Typed.coerce takes two values now, the value to coerce and the configurable in whose context the coerce is taking place. %s %s' % (typed.__class__, typed))
return typed.coerce(val)
class ProcessPassword(components.Adapter):
implements(iformless.IInputProcessor)
def process(self, context, boundTo, data):
"""Password needs to look at two passwords in the data,
"""
typed = self.original
pw1 = data[0]
args = context.locate(inevow.IRequest).args
binding = context.locate(iformless.IBinding)
pw2 = args.get("%s____2" % binding.name, [''])[0]
if typed.strip:
pw1 = pw1.strip()
pw2 = pw2.strip()
if pw1 != pw2:
raise formless.InputError("Passwords do not match. Please reenter.")
elif pw1 == '':
if typed.required:
raise formless.InputError(typed.requiredFailMessage)
else:
return typed.null
val = data[0]
if typed.unicode:
try:
val = val.decode(getPOSTCharset(context), 'replace')
except LookupError:
val = val.decode('utf-8', 'replace')
try:
return typed.coerce(val, boundTo)
except TypeError:
warnings.warn('Typed.coerce takes two values now, the value to coerce and the configurable in whose context the coerce is taking place. %s %s' % (typed.__class__, typed))
return typed.coerce(data[0])
class ProcessRequest(components.Adapter):
implements(iformless.IInputProcessor)
def process(self, context, boundTo, data):
return context.locate(inevow.IRequest)
class ProcessContext(components.Adapter):
implements(iformless.IInputProcessor)
def process(self, context, boundTo, data):
return context
class ProcessUpload(components.Adapter):
implements(iformless.IInputProcessor)
def process(self, context, boundTo, data):
typed = self.original
bind = context.locate(iformless.IBinding)
# TOTAL HACK: this comes from outer space
fields = context.locate(inevow.IRequest).fields
try:
field = fields[bind.name]
except KeyError:
return ''
def hasContent(field):
"""Test if the uploaded file has any content by looking for a single byte.
"""
file = field.file
pos = file.tell()
file.seek(0)
ch = file.read(1)
file.seek(pos)
return ch != ''
# Testing for required'ness is a bit of a hack (not my fault!) ...
# The upload is only considered missing if both the file name and content
# are empty. That allows for files with content called ' ' and empty files
# with a sensible name.
# field might be a list, if multiple files were uploaded with the same
# name.
if isinstance(field, list):
fieldList = field
else:
fieldList = [field]
for maybeEmptyField in fieldList:
if maybeEmptyField.filename.strip() or hasContent(maybeEmptyField):
break
else:
if typed.required:
raise formless.InputError(typed.requiredFailMessage)
else:
return typed.null
return field
def process(typed, data, configurable=None, ctx=None):
if ctx is None:
from nevow.testutil import FakeRequest
from nevow import context
fr = FakeRequest()
if type(data) is dict:
fr.args = data
ctx = context.RequestContext(tag=fr)
ctx.remember(fr, inevow.IRequest)
ctx.remember(None, inevow.IData)
try:
return iformless.IInputProcessor(typed).process(ctx, configurable, data, autoConfigure=False)
except TypeError:
return iformless.IInputProcessor(typed).process(ctx, configurable, data)
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