# Authors: # Jason Gerard DeRose # # Copyright (C) 2008 Red Hat # see file 'COPYING' for use and warranty information # # This program is free software; you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation, either version 3 of the License, or # (at your option) any later version. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program. If not, see . """ Base classes for all front-end plugins. """ import logging import six from ipapython.version import API_VERSION from ipapython.ipautil import APIVersion from ipalib.base import NameSpace from ipalib.plugable import Plugin, APINameSpace from ipalib.parameters import create_param, Param, Str, Flag from ipalib.parameters import Password # pylint: disable=unused-import from ipalib.output import Output, Entry, ListOfEntries from ipalib.text import _ from ipalib.errors import (ZeroArgumentError, MaxArgumentError, OverlapError, VersionError, OptionError, ValidationError, ConversionError) from ipalib import errors, messages from ipalib.request import context, context_frame from ipalib.util import classproperty, json_serialize if six.PY3: unicode = str logger = logging.getLogger(__name__) RULE_FLAG = 'validation_rule' def rule(obj): assert not hasattr(obj, RULE_FLAG) setattr(obj, RULE_FLAG, True) return obj def is_rule(obj): return callable(obj) and getattr(obj, RULE_FLAG, False) is True def entry_count(entry): """ Return the number of entries in an entry. This is primarly for the failed output parameter so we don't print empty values. We also use this to determine if a non-zero return value is needed. """ num_entries = 0 for f in entry: if type(entry[f]) is dict: num_entries = num_entries + entry_count(entry[f]) else: num_entries = num_entries + len(entry[f]) return num_entries class HasParam(Plugin): """ Base class for plugins that have `Param` `NameSpace` attributes. Subclasses of `HasParam` will on one or more attributes store `NameSpace` instances containing zero or more `Param` instances. These parameters might describe, for example, the arguments and options a command takes, or the attributes an LDAP entry can include, or whatever else the subclass sees fit. Although the interface a subclass must implement is very simple, it must conform to a specific naming convention: if you want a namespace ``SubClass.foo``, you must define a ``Subclass.takes_foo`` attribute and a ``SubCLass.get_foo()`` method, and you may optionally define a ``SubClass.check_foo()`` method. A quick big-picture example =========================== Say you want the ``options`` instance attribute on your subclass to be a `Param` `NameSpace`... then according to the enforced naming convention, your subclass must define a ``takes_options`` attribute and a ``get_options()`` method. For example: >>> from ipalib import Str, Int >>> class Example(HasParam): ... ... options = None # This will be replaced with your namespace ... ... takes_options = (Str('one'), Int('two')) ... ... def get_options(self): ... return self._get_param_iterable('options') ... >>> eg = Example() The ``Example.takes_options`` attribute is a ``tuple`` defining the parameters you want your ``Example.options`` namespace to contain. Your ``Example.takes_options`` attribute will be accessed via `HasParam._get_param_iterable()`, which, among other things, enforces the ``('takes_' + name)`` naming convention. For example: >>> eg._get_param_iterable('options') (Str('one'), Int('two')) The ``Example.get_options()`` method simply returns ``Example.takes_options`` by calling `HasParam._get_param_iterable()`. Your ``Example.get_options()`` method will be called via `HasParam._filter_param_by_context()`, which, among other things, enforces the ``('get_' + name)`` naming convention. For example: >>> list(eg._filter_param_by_context('options')) [Str('one'), Int('two')] At this point, the ``eg.options`` instance attribute is still ``None``: >>> eg.options is None True `HasParam._create_param_namespace()` will create the ``eg.options`` namespace from the parameters yielded by `HasParam._filter_param_by_context()`. For example: >>> eg._create_param_namespace('options') >>> eg.options NameSpace(<2 members>, sort=False) >>> list(eg.options) # Like dict.__iter__() ['one', 'two'] Your subclass can optionally define a ``check_options()`` method to perform sanity checks. If it exists, the ``check_options()`` method is called by `HasParam._create_param_namespace()` with a single value, the `NameSpace` instance it created. For example: >>> class Example2(Example): ... ... def check_options(self, namespace): ... for param in namespace(): # Like dict.itervalues() ... if param.name == 'three': ... raise ValueError("I dislike the param 'three'") ... print ' ** Looks good! **' # Note output below ... >>> eg = Example2() >>> eg._create_param_namespace('options') ** Looks good! ** >>> eg.options NameSpace(<2 members>, sort=False) However, if we subclass again and add a `Param` named ``'three'``: >>> class Example3(Example2): ... ... takes_options = (Str('one'), Int('two'), Str('three')) ... >>> eg = Example3() >>> eg._create_param_namespace('options') Traceback (most recent call last): ... ValueError: I dislike the param 'three' >>> eg.options is None # eg.options was not set True The Devil and the details ========================= In the above example, ``takes_options`` is a ``tuple``, but it can also be a param spec (see `create_param()`), or a callable that returns an iterable containing one or more param spec. Regardless of how ``takes_options`` is defined, `HasParam._get_param_iterable()` will return a uniform iterable, conveniently hiding the details. The above example uses the simplest ``get_options()`` method possible, but you could instead implement a ``get_options()`` method that would, for example, produce (or withhold) certain parameters based on the whether certain plugins are loaded. Think of ``takes_options`` as declarative, a simple definition of *what* parameters should be included in the namespace. You should only implement a ``takes_options()`` method if a `Param` must reference attributes on your plugin instance (for example, for validation rules); you should not use a ``takes_options()`` method to filter the parameters or add any other procedural behaviour. On the other hand, think of the ``get_options()`` method as imperative, a procedure for *how* the parameters should be created and filtered. In the example above the *how* just returns the *what* unchanged, but arbitrary logic can be implemented in the ``get_options()`` method. For example, you might filter certain parameters from ``takes_options`` base on some criteria, or you might insert additional parameters provided by other plugins. The typical use case for using ``get_options()`` this way is to procedurally generate the arguments and options for all the CRUD commands operating on a specific LDAP object: the `Object` plugin defines the possible LDAP entry attributes (as `Param`), and then the CRUD commands intelligently build their ``args`` and ``options`` namespaces based on which attribute is the primary key. In this way new LDAP attributes (aka parameters) can be added to the single point of definition (the `Object` plugin), and all the corresponding CRUD commands pick up these new parameters without requiring modification. For an example of how this is done, see the `ipalib.crud.Create` base class. However, there is one type of filtering you should not implement in your ``get_options()`` method, because it's already provided at a higher level: you should not filter parameters based on the value of ``api.env.context`` nor (preferably) on any values in ``api.env``. `HasParam._filter_param_by_context()` already does this by calling `Param.use_in_context()` for each parameter. Although the base `Param.use_in_context()` implementation makes a decision solely on the value of ``api.env.context``, subclasses can override this with implementations that consider arbitrary ``api.env`` values. """ # HasParam is the base class for most frontend plugins, that make it to users # This flag indicates that the command should not be available in the cli NO_CLI = False def _get_param_iterable(self, name, verb='takes'): """ Return an iterable of params defined by the attribute named ``name``. A sequence of params can be defined one of three ways: as a ``tuple``; as a callable that returns an iterable; or as a param spec (a `Param` or ``str`` instance). This method returns a uniform iterable regardless of how the param sequence was defined. For example, when defined with a tuple: >>> class ByTuple(HasParam): ... takes_args = (Param('foo'), Param('bar')) ... >>> by_tuple = ByTuple() >>> list(by_tuple._get_param_iterable('args')) [Param('foo'), Param('bar')] Or you can define your param sequence with a callable when you need to reference attributes on your plugin instance (for validation rules, etc.). For example: >>> class ByCallable(HasParam): ... def takes_args(self): ... yield Param('foo', self.validate_foo) ... yield Param('bar', self.validate_bar) ... ... def validate_foo(self, _, value, **kw): ... if value != 'Foo': ... return _("must be 'Foo'") ... ... def validate_bar(self, _, value, **kw): ... if value != 'Bar': ... return _("must be 'Bar'") ... >>> by_callable = ByCallable() >>> list(by_callable._get_param_iterable('args')) [Param('foo', validate_foo), Param('bar', validate_bar)] Lastly, as a convenience for when a param sequence contains a single param, your defining attribute may a param spec (either a `Param` or an ``str`` instance). For example: >>> class BySpec(HasParam): ... takes_args = Param('foo') ... takes_options = 'bar?' ... >>> by_spec = BySpec() >>> list(by_spec._get_param_iterable('args')) [Param('foo')] >>> list(by_spec._get_param_iterable('options')) ['bar?'] For information on how an ``str`` param spec is interpreted, see the `create_param()` and `parse_param_spec()` functions in the `ipalib.parameters` module. Also see `HasParam._filter_param_by_context()`. """ src_name = verb + '_' + name src = getattr(self, src_name, None) if type(src) is tuple: return src if isinstance(src, (Param, str)): return (src,) if callable(src): return src() if src is None: return tuple() raise TypeError( '%s.%s must be a tuple, callable, or spec; got %r' % ( self.name, src_name, src ) ) def _filter_param_by_context(self, name, env=None): """ Filter params on attribute named ``name`` by environment ``env``. For example: >>> from ipalib.config import Env >>> class Example(HasParam): ... ... takes_args = ( ... Str('foo_only', include=['foo']), ... Str('not_bar', exclude=['bar']), ... 'both', ... ) ... ... def get_args(self): ... return self._get_param_iterable('args') ... ... >>> eg = Example() >>> foo = Env(context='foo') >>> bar = Env(context='bar') >>> another = Env(context='another') >>> (foo.context, bar.context, another.context) (u'foo', u'bar', u'another') >>> list(eg._filter_param_by_context('args', foo)) [Str('foo_only', include=['foo']), Str('not_bar', exclude=['bar']), Str('both')] >>> list(eg._filter_param_by_context('args', bar)) [Str('both')] >>> list(eg._filter_param_by_context('args', another)) [Str('not_bar', exclude=['bar']), Str('both')] """ env = getattr(self, 'env', env) get_name = 'get_' + name if not hasattr(self, get_name): raise NotImplementedError( '%s.%s()' % (self.name, get_name) ) get = getattr(self, get_name) if not callable(get): raise TypeError( '%s.%s must be a callable; got %r' % (self.name, get_name, get) ) for spec in get(): param = create_param(spec) if env is None or param.use_in_context(env): yield param def _create_param_namespace(self, name, env=None): namespace = NameSpace( self._filter_param_by_context(name, env), sort=False ) if not self.api.is_production_mode(): check = getattr(self, 'check_' + name, None) if callable(check): check(namespace) setattr(self, name, namespace) @property def context(self): return context.current_frame _callback_registry = {} class Command(HasParam): """ A public IPA atomic operation. All plugins that subclass from `Command` will be automatically available as a CLI command and as an XML-RPC method. Plugins that subclass from Command are registered in the ``api.Command`` namespace. For example: >>> from ipalib import create_api >>> api = create_api() >>> class my_command(Command): ... pass ... >>> api.add_plugin(my_command) >>> api.finalize() >>> list(api.Command) [] >>> api.Command.my_command # doctest:+ELLIPSIS ipalib.frontend.my_command() This class's subclasses allow different types of callbacks to be added and removed to them. Registering a callback is done either by ``register_callback``, or by defining a ``_callback`` method. Subclasses should define the `callback_types` attribute as a tuple of allowed callback types. """ takes_options = tuple() takes_args = tuple() # Create stubs for attributes that are set in _on_finalize() args = Plugin.finalize_attr('args') options = Plugin.finalize_attr('options') params = Plugin.finalize_attr('params') params_by_default = Plugin.finalize_attr('params_by_default') obj = None use_output_validation = True output = Plugin.finalize_attr('output') has_output = ('result',) output_params = Plugin.finalize_attr('output_params') has_output_params = tuple() internal_options = tuple() msg_summary = None msg_truncated = _('Results are truncated, try a more specific search') callback_types = ('interactive_prompt',) api_version = API_VERSION @classmethod def __topic_getter(cls): return cls.__module__.rpartition('.')[2] topic = classproperty(__topic_getter) @property def forwarded_name(self): return self.full_name def __call__(self, *args, **options): """ Perform validation and then execute the command. If not in a server context, the call will be forwarded over XML-RPC and the executed an the nearest IPA server. """ self.ensure_finalized() with context_frame(): self.context.principal = getattr(context, 'principal', None) return self.__do_call(*args, **options) def __do_call(self, *args, **options): self.context.__messages = [] if 'version' in options: self.verify_client_version(unicode(options['version'])) elif self.api.env.skip_version_check and not self.api.env.in_server: options['version'] = u'2.0' else: options['version'] = self.api_version if self.api.env.in_server: # add message only on server side self.add_message( messages.VersionMissing(server_version=self.api_version)) params = self.args_options_2_params(*args, **options) logger.debug( 'raw: %s(%s)', self.name, ', '.join(self._repr_iter(**params)) ) if self.api.env.in_server: params.update(self.get_default(**params)) params = self.normalize(**params) params = self.convert(**params) logger.debug( '%s(%s)', self.name, ', '.join(self._repr_iter(**params)) ) if self.api.env.in_server: self.validate(**params) (args, options) = self.params_2_args_options(**params) ret = self.run(*args, **options) if isinstance(ret, dict): for message in self.context.__messages: messages.add_message(options['version'], ret, message) if ( isinstance(ret, dict) and 'summary' in self.output and 'summary' not in ret ): ret['summary'] = self.get_summary_default(ret) if self.use_output_validation and (self.output or ret is not None): self.validate_output(ret, options['version']) return ret def add_message(self, message): self.context.__messages.append(message) def _repr_iter(self, **params): """ Iterate through ``repr()`` of *safe* values of args and options. This method uses `parameters.Param.safe_value()` to mask passwords when logging. Logging the exact call is extremely useful, but we obviously don't want to log the cleartext password. For example: >>> class my_cmd(Command): ... takes_args = ('login',) ... takes_options=(Password('passwd'),) ... >>> c = my_cmd() >>> c.finalize() >>> list(c._repr_iter(login=u'Okay.', passwd=u'Private!')) ["u'Okay.'", "passwd=u'********'"] """ for arg in self.args(): value = params.get(arg.name, None) yield repr(arg.safe_value(value)) for option in self.options(): if option.name not in params: continue value = params[option.name] yield '%s=%r' % (option.name, option.safe_value(value)) def args_options_2_params(self, *args, **options): """ Merge (args, options) into params. """ if self.max_args is not None and len(args) > self.max_args: if self.max_args == 0: raise ZeroArgumentError(name=self.name) raise MaxArgumentError(name=self.name, count=self.max_args) params = dict(self.__options_2_params(options)) if len(args) > 0: arg_kw = dict(self.__args_2_params(args)) intersection = set(arg_kw).intersection(params) if len(intersection) > 0: raise OverlapError(names=sorted(intersection)) params.update(arg_kw) return params def __args_2_params(self, values): multivalue = False for (i, arg) in enumerate(self.args()): assert not multivalue if len(values) > i: if arg.multivalue: multivalue = True if len(values) == i + 1 and type(values[i]) in (list, tuple): yield (arg.name, values[i]) else: yield (arg.name, values[i:]) else: yield (arg.name, values[i]) else: break def __options_2_params(self, options): for name in self.params: if name in options: yield (name, options.pop(name)) # If any options remain, they are either internal or unknown unused_keys = set(options).difference(self.internal_options) if unused_keys: raise OptionError(_('Unknown option: %(option)s'), option=unused_keys.pop()) def args_options_2_entry(self, *args, **options): """ Creates a LDAP entry from attributes in args and options. """ kw = self.args_options_2_params(*args, **options) return dict(self.__attributes_2_entry(kw)) def __attributes_2_entry(self, kw): for name in self.params: if self.params[name].attribute and name in kw: value = kw[name] if isinstance(value, tuple): yield (name, [v for v in value]) else: yield (name, kw[name]) def params_2_args_options(self, **params): """ Split params into (args, options). """ args = tuple() options = dict(self.__params_2_options(params)) is_arg = True for name in self.args: try: value = params[name] except KeyError: is_arg = False continue if is_arg: args += (value,) else: options[name] = value return (args, options) def __params_2_options(self, params): for name in self.options: if name in params: yield(name, params[name]) def prompt_param(self, param, default=None, optional=False, kw=dict(), label=None): """ Prompts the user for the value of given parameter. Returns the parameter instance. """ if label is None: label = param.label while True: raw = self.Backend.textui.prompt(label, default, optional=optional) # Backend.textui.prompt does not fill in the default value, # we have to do it ourselves if not raw.strip(): return None try: return param(raw, **kw) except (ValidationError, ConversionError) as e: # Display error and prompt again self.Backend.textui.print_prompt_attribute_error(unicode(label), unicode(e.error)) def normalize(self, **kw): """ Return a dictionary of normalized values. For example: >>> class my_command(Command): ... takes_options = ( ... Param('first', normalizer=lambda value: value.lower()), ... Param('last'), ... ) ... >>> c = my_command() >>> c.finalize() >>> c.normalize(first=u'JOHN', last=u'DOE') {'last': u'DOE', 'first': u'john'} """ return dict( (k, self.params[k].normalize(v)) for (k, v) in kw.items() ) def convert(self, **kw): """ Return a dictionary of values converted to correct type. >>> from ipalib import Int >>> class my_command(Command): ... takes_args = ( ... Int('one'), ... 'two', ... ) ... >>> c = my_command() >>> c.finalize() >>> c.convert(one=1, two=2) {'two': u'2', 'one': 1} """ return dict( (k, self.params[k].convert(v)) for (k, v) in kw.items() ) def __convert_iter(self, kw): for param in self.params(): if kw.get(param.name, None) is None: continue def get_default(self, _params=None, **kw): """ Return a dictionary of defaults for all missing required values. For example: >>> from ipalib import Str >>> class my_command(Command): ... takes_args = Str('color', default=u'Red') ... >>> c = my_command() >>> c.finalize() >>> c.get_default() {'color': u'Red'} >>> c.get_default(color=u'Yellow') {} """ if _params is None: _params = [p.name for p in self.params() if p.name not in kw and (p.required or p.autofill)] return dict(self.__get_default_iter(_params, kw)) def get_default_of(self, _name, **kw): """ Return default value for parameter `_name`. """ default = dict(self.__get_default_iter([_name], kw)) return default.get(_name) def __get_default_iter(self, params, kw): """ Generator method used by `Command.get_default` and `Command.get_default_of`. """ # Find out what additional parameters are needed to dynamically create # the default values with default_from. dep = set() for param in reversed(self.params_by_default): if param.name in params or param.name in dep: if param.default_from is None: continue for name in param.default_from.keys: dep.add(name) for param in self.params_by_default(): default = None hasdefault = False if param.name in dep: if param.name in kw: # Parameter is specified, convert and validate the value. value = param(kw[param.name], **kw) if self.api.env.in_server: param.validate(value, supplied=True) kw[param.name] = value else: # Parameter is not specified, use default value. Convert # and validate the value, it might not be returned so # there's no guarantee it will be converted and validated # later. default = param(None, **kw) if self.api.env.in_server: param.validate(default) if default is not None: kw[param.name] = default hasdefault = True if param.name in params: if not hasdefault: # Default value is not available from the previous step, # get it now. At this point it is certain that the value # will be returned, so let the caller care about conversion # and validation. default = param.get_default(**kw) if default is not None: yield (param.name, default) def validate(self, **kw): """ Validate all values. If any value fails the validation, `ipalib.errors.ValidationError` (or a subclass thereof) will be raised. """ for param in self.params(): value = kw.get(param.name, None) param.validate(value, supplied=param.name in kw) def verify_client_version(self, client_version): """ Compare the version the client provided to the version of the server. If the client major version does not match then return an error. If the client minor version is less than or equal to the server then let the request proceed. """ server_apiver = APIVersion(self.api_version) try: client_apiver = APIVersion(client_version) except ValueError: raise VersionError(cver=client_version, sver=self.api_version, server=self.env.xmlrpc_uri) if client_apiver.major != server_apiver.major: raise VersionError(cver=client_version, sver=self.api_version, server=self.env.xmlrpc_uri) def run(self, *args, **options): """ Dispatch to `Command.execute` or `Command.forward`. If running in a server context, `Command.execute` is called and the actually work this command performs is executed locally. If running in a non-server context, `Command.forward` is called, which forwards this call over RPC to the exact same command on the nearest IPA server and the actual work this command performs is executed remotely. """ if self.api.env.in_server: return self.execute(*args, **options) return self.forward(*args, **options) def execute(self, *args, **kw): """ Perform the actual work this command does. This method should be implemented only against functionality in self.api.Backend. For example, a hypothetical user_add.execute() might be implemented like this: >>> class user_add(Command): ... def execute(self, **kw): ... return self.api.Backend.ldap.add(**kw) ... """ raise NotImplementedError('%s.execute()' % self.name) def forward(self, *args, **kw): """ Forward call over RPC to this same command on server. """ try: return self.Backend.rpcclient.forward(self.forwarded_name, *args, **kw) except errors.RequirementError as e: if self.api.env.context != 'cli': raise name = getattr(e, 'name', None) if name is None or name not in self.params: raise raise errors.RequirementError(name=self.params[name].cli_name) def _on_finalize(self): """ Finalize plugin initialization. This method creates the ``args``, ``options``, and ``params`` namespaces. This is not done in `Command.__init__` because subclasses (like `crud.Add`) might need to access other plugins loaded in self.api to determine what their custom `Command.get_args` and `Command.get_options` methods should yield. """ self._create_param_namespace('args') if len(self.args) == 0 or not self.args[-1].multivalue: self.max_args = len(self.args) else: self.max_args = None self._create_param_namespace('options') params_nosort = tuple(self.args()) + tuple(self.options()) def get_key(p): if p.required: if p.sortorder < 0: return p.sortorder if p.default_from is None: return 0 return 1 return 2 self.params = NameSpace( sorted(params_nosort, key=get_key), sort=False ) # Sort params so that the ones with default_from come after the ones # that the default_from might depend on and save the result in # params_by_default namespace. params = [] for i in params_nosort: pos = len(params) for j in params_nosort: if j.default_from is None: continue if i.name not in j.default_from.keys: continue try: pos = min(pos, params.index(j)) except ValueError: pass params.insert(pos, i) self.params_by_default = NameSpace(params, sort=False) self.output = NameSpace(self._iter_output(), sort=False) self._create_param_namespace('output_params') super(Command, self)._on_finalize() def _iter_output(self): if type(self.has_output) is not tuple: raise TypeError('%s.has_output: need a %r; got a %r: %r' % ( self.name, tuple, type(self.has_output), self.has_output) ) for (i, o) in enumerate(self.has_output): if isinstance(o, str): o = Output(o) if not isinstance(o, Output): raise TypeError('%s.has_output[%d]: need a %r; got a %r: %r' % ( self.name, i, (str, Output), type(o), o) ) yield o def get_args(self): """ Iterate through parameters for ``Command.args`` namespace. This method gets called by `HasParam._create_param_namespace()`. Subclasses can override this to customize how the arguments are determined. For an example of why this can be useful, see the `ipalib.crud.Create` subclass. """ for arg in self._get_param_iterable('args'): yield arg def check_args(self, args): """ Sanity test for args namespace. This method gets called by `HasParam._create_param_namespace()`. """ optional = False multivalue = False for arg in args(): if optional and arg.required: raise ValueError( '%s: required argument after optional in %s arguments %s' % (arg.name, self.name, [x.param_spec for x in args()]) ) if multivalue: raise ValueError( '%s: only final argument can be multivalue' % arg.name ) if not arg.required: optional = True if arg.multivalue: multivalue = True def get_options(self): """ Iterate through parameters for ``Command.options`` namespace. This method gets called by `HasParam._create_param_namespace()`. For commands that return entries two special options are generated: --all makes the command retrieve/display all attributes --raw makes the command display attributes as they are stored Subclasses can override this to customize how the arguments are determined. For an example of why this can be useful, see the `ipalib.crud.Create` subclass. """ for option in self._get_param_iterable('options'): yield option for o in self.has_output: if isinstance(o, (Entry, ListOfEntries)): yield Flag('all', cli_name='all', doc=_('Retrieve and print all attributes from the server. Affects command output.'), exclude='webui', flags=['no_output'], ) yield Flag('raw', cli_name='raw', doc=_('Print entries as stored on the server. Only affects output format.'), exclude='webui', flags=['no_output'], ) break yield Str('version?', doc=_('Client version. Used to determine if server will accept request.'), exclude='webui', flags=['no_option', 'no_output'], ) def validate_output(self, output, version=API_VERSION): """ Validate the return value to make sure it meets the interface contract. """ nice = '%s.validate_output()' % self.name if not isinstance(output, dict): raise TypeError('%s: need a %r; got a %r: %r' % ( nice, dict, type(output), output) ) expected_set = set(self.output) actual_set = set(output) - set(['messages']) if expected_set != actual_set: missing = expected_set - actual_set if missing: raise ValueError('%s: missing keys %r in %r' % ( nice, sorted(missing), output) ) extra = actual_set - expected_set if extra: raise ValueError('%s: unexpected keys %r in %r' % ( nice, sorted(extra), output) ) for o in self.output(): value = output[o.name] if not (o.type is None or isinstance(value, o.type)): raise TypeError('%s:\n output[%r]: need %r; got %r: %r' % ( nice, o.name, o.type, type(value), value) ) if callable(o.validate): o.validate(self, value, version) def get_output_params(self): for param in self._get_param_iterable('output_params', verb='has'): yield param def get_summary_default(self, output): if self.msg_summary: return self.msg_summary % output else: return None def log_messages(self, output): logger_functions = dict( debug=logger.debug, info=logger.info, warning=logger.warning, error=logger.error, ) for message in output.get('messages', ()): try: function = logger_functions[message['type']] except KeyError: logger.error('Server sent a message with a wrong type') function = logger.error function(message.get('message')) def output_for_cli(self, textui, output, *args, **options): """ Generic output method. Prints values the output argument according to their type and self.output. Entry attributes are labeled and printed in the order specified in self.output_params. Attributes that aren't present in self.output_params are not printed unless the command was invokend with the --all option. Attribute labelling is disabled if the --raw option was given. Subclasses can override this method, if custom output is needed. """ if not isinstance(output, dict): return None rv = 0 self.log_messages(output) order = [] labels = {} flags = {} for p in self.output_params(): order.append(p.name) labels[p.name] = unicode(p.label) flags[p.name] = p.flags if options.get('all', False): order.insert(0, 'dn') print_all = True else: print_all = False if options.get('raw', False): labels = None for o in self.output: outp = self.output[o] if 'no_display' in outp.flags: continue result = output.get(o) if o == 'value': continue elif o.lower() == 'count' and result == 0: rv = 1 elif o.lower() == 'failed': if entry_count(result) == 0: # Don't display an empty failed list continue else: # Return an error to the shell rv = 1 if isinstance(outp, ListOfEntries): textui.print_entries(result, order, labels, flags, print_all) elif isinstance(result, (tuple, list)): textui.print_entries(result, order, labels, flags, print_all) elif isinstance(outp, Entry): textui.print_entry(result, order, labels, flags, print_all) elif isinstance(result, dict): textui.print_entry(result, order, labels, flags, print_all) elif isinstance(result, unicode): if o == 'summary': textui.print_summary(result) else: textui.print_indented(result) elif isinstance(result, bool): # the Delete commands return a boolean indicating # success or failure. Ignore these. pass elif isinstance(result, int): textui.print_count(result, '%s %%d' % unicode(self.output[o].doc)) return rv # list of attributes we want exported to JSON json_friendly_attributes = ( 'name', 'doc', 'NO_CLI' ) def __json__(self): json_dict = dict( (a, getattr(self, a)) for a in self.json_friendly_attributes ) json_dict['takes_args'] = list(self.get_args()) json_dict['takes_options'] = list(self.get_options()) return json_dict @classmethod def get_callbacks(cls, callback_type): """Yield callbacks of the given type""" # Use one shared callback registry, keyed on class, to avoid problems # with missing attributes being looked up in superclasses callbacks = _callback_registry.get(callback_type, {}).get(cls, [None]) for callback in callbacks: if callback is None: try: yield getattr(cls, '%s_callback' % callback_type) except AttributeError: pass else: yield callback @classmethod def register_callback(cls, callback_type, callback, first=False): """Register a callback :param callback_type: The callback type (e.g. 'pre', 'post') :param callback: The callable added :param first: If true, the new callback will be added before all existing callbacks; otherwise it's added after them Note that callbacks registered this way will be attached to this class only, not to its subclasses. """ assert callback_type in cls.callback_types assert callable(callback) _callback_registry.setdefault(callback_type, {}) try: callbacks = _callback_registry[callback_type][cls] except KeyError: callbacks = _callback_registry[callback_type][cls] = [None] if first: callbacks.insert(0, callback) else: callbacks.append(callback) @classmethod def register_interactive_prompt_callback(cls, callback, first=False): """Shortcut for register_callback('interactive_prompt', ...)""" cls.register_callback('interactive_prompt', callback, first) def interactive_prompt_callback(self, kw): return class LocalOrRemote(Command): """ A command that is explicitly executed locally or remotely. This is for commands that makes sense to execute either locally or remotely to return a perhaps different result. The best example of this is the `ipalib.plugins.f_misc.env` plugin which returns the key/value pairs describing the configuration state: it can be """ takes_options = ( Flag('server?', doc=_('Forward to server instead of running locally'), ), ) def run(self, *args, **options): """ Dispatch to forward() or execute() based on ``server`` option. When running in a client context, this command is executed remotely if ``options['server']`` is true; otherwise it is executed locally. When running in a server context, this command is always executed locally and the value of ``options['server']`` is ignored. """ if options.get('server', False) and not self.env.in_server: return self.forward(*args, **options) return self.execute(*args, **options) class Local(Command): """ A command that is explicitly executed locally. This is for commands that makes sense to execute only locally such as the help command. """ def run(self, *args, **options): """ Dispatch to forward() onlly. """ return self.forward(*args, **options) def forward(self, *args, **options): return self.execute(*args, **options) class Object(HasParam): # Create stubs for attributes that are set in _on_finalize() backend = Plugin.finalize_attr('backend') methods = Plugin.finalize_attr('methods') params = Plugin.finalize_attr('params') primary_key = Plugin.finalize_attr('primary_key') params_minus_pk = Plugin.finalize_attr('params_minus_pk') # Can override in subclasses: backend_name = None takes_params = tuple() def _on_finalize(self): self.methods = NameSpace( self.__get_attrs('Method'), sort=False, name_attr='attr_name' ) self._create_param_namespace('params') pkeys = [p for p in self.params() if p.primary_key] if len(pkeys) > 1: raise ValueError( '%s (Object) has multiple primary keys: %s' % ( self.name, ', '.join(p.name for p in pkeys), ) ) if len(pkeys) == 1: self.primary_key = pkeys[0] self.params_minus_pk = NameSpace( [p for p in self.params() if not p.primary_key], sort=False ) else: self.primary_key = None self.params_minus_pk = self.params if 'Backend' in self.api and self.backend_name in self.api.Backend: self.backend = self.api.Backend[self.backend_name] super(Object, self)._on_finalize() def params_minus(self, *names): """ Yield all Param whose name is not in ``names``. """ if len(names) == 1 and not isinstance(names[0], (Param, str)): names = names[0] minus = frozenset(names) for param in self.params(): if param.name in minus or param in minus: continue yield param def get_dn(self, *args, **kwargs): """ Construct an LDAP DN. """ raise NotImplementedError('%s.get_dn()' % self.name) def __get_attrs(self, name): if name not in self.api: return namespace = self.api[name] assert type(namespace) is APINameSpace for plugin in namespace(): # Equivalent to dict.itervalues() if plugin is not namespace[plugin.name]: continue if plugin.obj_name == self.name: yield plugin def get_params(self): """ This method gets called by `HasParam._create_param_namespace()`. """ for spec in self._get_param_iterable('params'): assert isinstance(spec, (str, Param)) yield create_param(spec) json_friendly_attributes = ( 'name', 'takes_params', ) def __json__(self): json_dict = dict( (a, json_serialize(getattr(self, a))) for a in self.json_friendly_attributes ) if self.primary_key: json_dict['primary_key'] = self.primary_key.name json_dict['methods'] = [m for m in self.methods] return json_dict class Attribute(Plugin): """ Base class implementing the attribute-to-object association. `Attribute` plugins are associated with an `Object` plugin to group a common set of commands that operate on a common set of parameters. The association between attribute and object is done using a simple naming convention: the first part of the plugin class name (up to the first underscore) is the object name, and rest is the attribute name, as this table shows: =============== =========== ============== Class name Object name Attribute name =============== =========== ============== noun_verb noun verb user_add user add user_first_name user first_name =============== =========== ============== For example: >>> class user_add(Attribute): ... pass ... >>> instance = user_add() >>> instance.obj_name 'user' >>> instance.attr_name 'add' In practice the `Attribute` class is not used directly, but rather is only the base class for the `Method` class. Also see the `Object` class. """ obj_version = '1' @property def obj_name(self): return self.name.partition('_')[0] @property def obj_full_name(self): if self.obj is not None: return self.obj.full_name else: return None @property def attr_name(self): prefix = '{}_'.format(self.obj_name) assert self.name.startswith(prefix) return self.name[len(prefix):] @property def obj(self): if self.obj_name is not None and self.obj_version is not None: return self.api.Object[self.obj_name, self.obj_version] else: return None class Method(Attribute, Command): """ A command with an associated object. A `Method` plugin must have a corresponding `Object` plugin. The association between object and method is done through a simple naming convention: the first part of the method name (up to the first under score) is the object name, as the examples in this table show: ============= =========== ============== Method name Object name Attribute name ============= =========== ============== user_add user add noun_verb noun verb door_open_now door open_now ============= =========== ============== There are three different places a method can be accessed. For example, say you created a `Method` plugin and its corresponding `Object` plugin like this: >>> from ipalib import create_api >>> api = create_api() >>> class user_add(Method): ... def run(self, **options): ... return dict(result='Added the user!') ... >>> class user(Object): ... pass ... >>> api.add_plugin(user_add) >>> api.add_plugin(user) >>> api.finalize() First, the ``user_add`` plugin can be accessed through the ``api.Method`` namespace: >>> list(api.Method) [] >>> api.Method.user_add(version=u'2.88') # Will call user_add.run() {'result': 'Added the user!'} (The "version" argument is the API version to use. The current API version can be found in ipalib.version.API_VERSION.) Second, because `Method` is a subclass of `Command`, the ``user_add`` plugin can also be accessed through the ``api.Command`` namespace: >>> list(api.Command) [] >>> api.Command.user_add(version=u'2.88') # Will call user_add.run() {'result': 'Added the user!'} And third, ``user_add`` can be accessed as an attribute on the ``user`` `Object`: >>> list(api.Object) [] >>> list(api.Object.user.methods) ['add'] >>> api.Object.user.methods.add(version=u'2.88') # Will call user_add.run() {'result': 'Added the user!'} The `Attribute` base class implements the naming convention for the attribute-to-object association. Also see the `Object` class. """ extra_options_first = False extra_args_first = False def get_output_params(self): if self.obj is not None: for param in self.obj.params(): if 'no_output' in param.flags: continue yield param for param in super(Method, self).get_output_params(): yield param class Updater(Plugin): """ An LDAP update with an associated object (always update). All plugins that subclass from `Updater` will be automatically available as a server update function. Plugins that subclass from Updater are registered in the ``api.Updater`` namespace. For example: >>> from ipalib import create_api >>> api = create_api() >>> class my(Object): ... pass ... >>> api.add_plugin(my) >>> class my_update(Updater): ... pass ... >>> api.add_plugin(my_update) >>> api.finalize() >>> list(api.Updater) [] >>> api.Updater.my_update # doctest:+ELLIPSIS ipalib.frontend.my_update() """ def execute(self, **options): raise NotImplementedError('%s.execute()' % self.name) def __call__(self, **options): logger.debug( 'raw: %s', self.name ) return self.execute(**options)