# (c) 2012-2014, Michael DeHaan <michael.dehaan@gmail.com>
#
# This file is part of Ansible
#
# Ansible 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.
#
# Ansible 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 Ansible. If not, see <http://www.gnu.org/licenses/>.
# Make coding more python3-ish
from __future__ import (absolute_import, division, print_function)
__metaclass__ = type
import ast
import datetime
import os
import pkgutil
import pwd
import re
import time
from contextlib import contextmanager
from distutils.version import LooseVersion
from numbers import Number
from traceback import format_exc
try:
from hashlib import sha1
except ImportError:
from sha import sha as sha1
from jinja2.exceptions import TemplateSyntaxError, UndefinedError
from jinja2.loaders import FileSystemLoader
from jinja2.runtime import Context, StrictUndefined
from ansible import constants as C
from ansible.errors import AnsibleError, AnsibleFilterError, AnsiblePluginRemovedError, AnsibleUndefinedVariable, AnsibleAssertionError
from ansible.module_utils.six import iteritems, string_types, text_type
from ansible.module_utils.six.moves import range
from ansible.module_utils._text import to_native, to_text, to_bytes
from ansible.module_utils.common._collections_compat import Iterator, Sequence, Mapping, MappingView, MutableMapping
from ansible.module_utils.common.collections import is_sequence
from ansible.module_utils.compat.importlib import import_module
from ansible.plugins.loader import filter_loader, lookup_loader, test_loader
from ansible.template.safe_eval import safe_eval
from ansible.template.template import AnsibleJ2Template
from ansible.template.vars import AnsibleJ2Vars
from ansible.utils.collection_loader import AnsibleCollectionRef
from ansible.utils.display import Display
from ansible.utils.collection_loader._collection_finder import _get_collection_metadata
from ansible.utils.unsafe_proxy import wrap_var
display = Display()
__all__ = ['Templar', 'generate_ansible_template_vars']
# A regex for checking to see if a variable we're trying to
# expand is just a single variable name.
# Primitive Types which we don't want Jinja to convert to strings.
NON_TEMPLATED_TYPES = (bool, Number)
JINJA2_OVERRIDE = '#jinja2:'
from jinja2 import __version__ as j2_version
USE_JINJA2_NATIVE = False
if C.DEFAULT_JINJA2_NATIVE:
try:
from jinja2.nativetypes import NativeEnvironment as Environment
from ansible.template.native_helpers import ansible_native_concat as j2_concat
USE_JINJA2_NATIVE = True
except ImportError:
from jinja2 import Environment
from jinja2.utils import concat as j2_concat
display.warning(
'jinja2_native requires Jinja 2.10 and above. '
'Version detected: %s. Falling back to default.' % j2_version
)
else:
from jinja2 import Environment
from jinja2.utils import concat as j2_concat
JINJA2_BEGIN_TOKENS = frozenset(('variable_begin', 'block_begin', 'comment_begin', 'raw_begin'))
JINJA2_END_TOKENS = frozenset(('variable_end', 'block_end', 'comment_end', 'raw_end'))
RANGE_TYPE = type(range(0))
def generate_ansible_template_vars(path, dest_path=None):
b_path = to_bytes(path)
try:
template_uid = pwd.getpwuid(os.stat(b_path).st_uid).pw_name
except (KeyError, TypeError):
template_uid = os.stat(b_path).st_uid
temp_vars = {
'template_host': to_text(os.uname()[1]),
'template_path': path,
'template_mtime': datetime.datetime.fromtimestamp(os.path.getmtime(b_path)),
'template_uid': to_text(template_uid),
'template_fullpath': os.path.abspath(path),
'template_run_date': datetime.datetime.now(),
'template_destpath': to_native(dest_path) if dest_path else None,
}
managed_default = C.DEFAULT_MANAGED_STR
managed_str = managed_default.format(
host=temp_vars['template_host'],
uid=temp_vars['template_uid'],
file=temp_vars['template_path'],
)
temp_vars['ansible_managed'] = to_text(time.strftime(to_native(managed_str), time.localtime(os.path.getmtime(b_path))))
return temp_vars
def _escape_backslashes(data, jinja_env):
"""Double backslashes within jinja2 expressions
A user may enter something like this in a playbook::
debug:
msg: "Test Case 1\\3; {{ test1_name | regex_replace('^(.*)_name$', '\\1')}}"
The string inside of the {{ gets interpreted multiple times First by yaml.
Then by python. And finally by jinja2 as part of it's variable. Because
it is processed by both python and jinja2, the backslash escaped
characters get unescaped twice. This means that we'd normally have to use
four backslashes to escape that. This is painful for playbook authors as
they have to remember different rules for inside vs outside of a jinja2
expression (The backslashes outside of the "{{ }}" only get processed by
yaml and python. So they only need to be escaped once). The following
code fixes this by automatically performing the extra quoting of
backslashes inside of a jinja2 expression.
"""
if '\\' in data and '{{' in data:
new_data = []
d2 = jinja_env.preprocess(data)
in_var = False
for token in jinja_env.lex(d2):
if token[1] == 'variable_begin':
in_var = True
new_data.append(token[2])
elif token[1] == 'variable_end':
in_var = False
new_data.append(token[2])
elif in_var and token[1] == 'string':
# Double backslashes only if we're inside of a jinja2 variable
new_data.append(token[2].replace('\\', '\\\\'))
else:
new_data.append(token[2])
data = ''.join(new_data)
return data
def is_template(data, jinja_env):
"""This function attempts to quickly detect whether a value is a jinja2
template. To do so, we look for the first 2 matching jinja2 tokens for
start and end delimiters.
"""
found = None
start = True
comment = False
d2 = jinja_env.preprocess(data)
# This wraps a lot of code, but this is due to lex returning a generator
# so we may get an exception at any part of the loop
try:
for token in jinja_env.lex(d2):
if token[1] in JINJA2_BEGIN_TOKENS:
if start and token[1] == 'comment_begin':
# Comments can wrap other token types
comment = True
start = False
# Example: variable_end -> variable
found = token[1].split('_')[0]
elif token[1] in JINJA2_END_TOKENS:
if token[1].split('_')[0] == found:
return True
elif comment:
continue
return False
except TemplateSyntaxError:
return False
return False
def _count_newlines_from_end(in_str):
'''
Counts the number of newlines at the end of a string. This is used during
the jinja2 templating to ensure the count matches the input, since some newlines
may be thrown away during the templating.
'''
try:
i = len(in_str)
j = i - 1
while in_str[j] == '\n':
j -= 1
return i - 1 - j
except IndexError:
# Uncommon cases: zero length string and string containing only newlines
return i
def recursive_check_defined(item):
from jinja2.runtime import Undefined
if isinstance(item, MutableMapping):
for key in item:
recursive_check_defined(item[key])
elif isinstance(item, list):
for i in item:
recursive_check_defined(i)
else:
if isinstance(item, Undefined):
raise AnsibleFilterError("{0} is undefined".format(item))
def _is_rolled(value):
"""Helper method to determine if something is an unrolled generator,
iterator, or similar object
"""
return (
isinstance(value, Iterator) or
isinstance(value, MappingView) or
isinstance(value, RANGE_TYPE)
)
def _unroll_iterator(func):
"""Wrapper function, that intercepts the result of a filter
and auto unrolls a generator, so that users are not required to
explicitly use ``|list`` to unroll.
"""
def wrapper(*args, **kwargs):
ret = func(*args, **kwargs)
if _is_rolled(ret):
return list(ret)
return ret
# This code is duplicated from ``functools.update_wrapper`` from Py3.7.
# ``functools.update_wrapper`` was failing when the func was ``functools.partial``
for attr in ('__module__', '__name__', '__qualname__', '__doc__', '__annotations__'):
try:
value = getattr(func, attr)
except AttributeError:
pass
else:
setattr(wrapper, attr, value)
for attr in ('__dict__',):
getattr(wrapper, attr).update(getattr(func, attr, {}))
wrapper.__wrapped__ = func
return wrapper
class AnsibleUndefined(StrictUndefined):
'''
A custom Undefined class, which returns further Undefined objects on access,
rather than throwing an exception.
'''
def __getattr__(self, name):
if name == '__UNSAFE__':
# AnsibleUndefined should never be assumed to be unsafe
# This prevents ``hasattr(val, '__UNSAFE__')`` from evaluating to ``True``
raise AttributeError(name)
# Return original Undefined object to preserve the first failure context
return self
def __getitem__(self, key):
# Return original Undefined object to preserve the first failure context
return self
def __repr__(self):
return 'AnsibleUndefined'
class AnsibleContext(Context):
'''
A custom context, which intercepts resolve() calls and sets a flag
internally if any variable lookup returns an AnsibleUnsafe value. This
flag is checked post-templating, and (when set) will result in the
final templated result being wrapped in AnsibleUnsafe.
'''
def __init__(self, *args, **kwargs):
super(AnsibleContext, self).__init__(*args, **kwargs)
self.unsafe = False
def _is_unsafe(self, val):
'''
Our helper function, which will also recursively check dict and
list entries due to the fact that they may be repr'd and contain
a key or value which contains jinja2 syntax and would otherwise
lose the AnsibleUnsafe value.
'''
if isinstance(val, dict):
for key in val.keys():
if self._is_unsafe(val[key]):
return True
elif isinstance(val, list):
for item in val:
if self._is_unsafe(item):
return True
elif getattr(val, '__UNSAFE__', False) is True:
return True
return False
def _update_unsafe(self, val):
if val is not None and not self.unsafe and self._is_unsafe(val):
self.unsafe = True
def resolve(self, key):
'''
The intercepted resolve(), which uses the helper above to set the
internal flag whenever an unsafe variable value is returned.
'''
val = super(AnsibleContext, self).resolve(key)
self._update_unsafe(val)
return val
def resolve_or_missing(self, key):
val = super(AnsibleContext, self).resolve_or_missing(key)
self._update_unsafe(val)
return val
def get_all(self):
"""Return the complete context as a dict including the exported
variables. For optimizations reasons this might not return an
actual copy so be careful with using it.
This is to prevent from running ``AnsibleJ2Vars`` through dict():
``dict(self.parent, **self.vars)``
In Ansible this means that ALL variables would be templated in the
process of re-creating the parent because ``AnsibleJ2Vars`` templates
each variable in its ``__getitem__`` method. Instead we re-create the
parent via ``AnsibleJ2Vars.add_locals`` that creates a new
``AnsibleJ2Vars`` copy without templating each variable.
This will prevent unnecessarily templating unused variables in cases
like setting a local variable and passing it to {% include %}
in a template.
Also see ``AnsibleJ2Template``and
https://github.com/pallets/jinja/commit/d67f0fd4cc2a4af08f51f4466150d49da7798729
"""
if LooseVersion(j2_version) >= LooseVersion('2.9'):
if not self.vars:
return self.parent
if not self.parent:
return self.vars
if isinstance(self.parent, AnsibleJ2Vars):
return self.parent.add_locals(self.vars)
else:
# can this happen in Ansible?
return dict(self.parent, **self.vars)
class JinjaPluginIntercept(MutableMapping):
def __init__(self, delegatee, pluginloader, *args, **kwargs):
super(JinjaPluginIntercept, self).__init__(*args, **kwargs)
self._delegatee = delegatee
self._pluginloader = pluginloader
if self._pluginloader.class_name == 'FilterModule':
self._method_map_name = 'filters'
self._dirname = 'filter'
elif self._pluginloader.class_name == 'TestModule':
self._method_map_name = 'tests'
self._dirname = 'test'
self._collection_jinja_func_cache = {}
# FUTURE: we can cache FQ filter/test calls for the entire duration of a run, since a given collection's impl's
# aren't supposed to change during a run
def __getitem__(self, key):
try:
if not isinstance(key, string_types):
raise ValueError('key must be a string')
key = to_native(key)
if '.' not in key: # might be a built-in or legacy, check the delegatee dict first, then try for a last-chance base redirect
func = self._delegatee.get(key)
if func:
return func
# didn't find it in the pre-built Jinja env, assume it's a former builtin and follow the normal routing path
leaf_key = key
key = 'ansible.builtin.' + key
else:
leaf_key = key.split('.')[-1]
acr = AnsibleCollectionRef.try_parse_fqcr(key, self._dirname)
if not acr:
raise KeyError('invalid plugin name: {0}'.format(key))
ts = _get_collection_metadata(acr.collection)
# TODO: implement support for collection-backed redirect (currently only builtin)
# TODO: implement cycle detection (unified across collection redir as well)
routing_entry = ts.get('plugin_routing', {}).get(self._dirname, {}).get(leaf_key, {})
deprecation_entry = routing_entry.get('deprecation')
if deprecation_entry:
warning_text = deprecation_entry.get('warning_text')
removal_date = deprecation_entry.get('removal_date')
removal_version = deprecation_entry.get('removal_version')
if not warning_text:
warning_text = '{0} "{1}" is deprecated'.format(self._dirname, key)
display.deprecated(warning_text, version=removal_version, date=removal_date, collection_name=acr.collection)
tombstone_entry = routing_entry.get('tombstone')
if tombstone_entry:
warning_text = tombstone_entry.get('warning_text')
removal_date = tombstone_entry.get('removal_date')
removal_version = tombstone_entry.get('removal_version')
if not warning_text:
warning_text = '{0} "{1}" has been removed'.format(self._dirname, key)
exc_msg = display.get_deprecation_message(warning_text, version=removal_version, date=removal_date,
collection_name=acr.collection, removed=True)
raise AnsiblePluginRemovedError(exc_msg)
redirect_fqcr = routing_entry.get('redirect', None)
if redirect_fqcr:
acr = AnsibleCollectionRef.from_fqcr(ref=redirect_fqcr, ref_type=self._dirname)
display.vvv('redirecting {0} {1} to {2}.{3}'.format(self._dirname, key, acr.collection, acr.resource))
key = redirect_fqcr
# TODO: handle recursive forwarding (not necessary for builtin, but definitely for further collection redirs)
func = self._collection_jinja_func_cache.get(key)
if func:
return func
try:
pkg = import_module(acr.n_python_package_name)
except ImportError:
raise KeyError()
parent_prefix = acr.collection
if acr.subdirs:
parent_prefix = '{0}.{1}'.format(parent_prefix, acr.subdirs)
# TODO: implement collection-level redirect
for dummy, module_name, ispkg in pkgutil.iter_modules(pkg.__path__, prefix=parent_prefix + '.'):
if ispkg:
continue
try:
plugin_impl = self._pluginloader.get(module_name)
except Exception as e:
raise TemplateSyntaxError(to_native(e), 0)
method_map = getattr(plugin_impl, self._method_map_name)
for f in iteritems(method_map()):
fq_name = '.'.join((parent_prefix, f[0]))
# FIXME: detect/warn on intra-collection function name collisions
self._collection_jinja_func_cache[fq_name] = _unroll_iterator(f[1])
function_impl = self._collection_jinja_func_cache[key]
return function_impl
except AnsiblePluginRemovedError as apre:
raise TemplateSyntaxError(to_native(apre), 0)
except KeyError:
raise
except Exception as ex:
display.warning('an unexpected error occurred during Jinja2 environment setup: {0}'.format(to_native(ex)))
display.vvv('exception during Jinja2 environment setup: {0}'.format(format_exc()))
raise TemplateSyntaxError(to_native(ex), 0)
def __setitem__(self, key, value):
return self._delegatee.__setitem__(key, value)
def __delitem__(self, key):
raise NotImplementedError()
def __iter__(self):
# not strictly accurate since we're not counting dynamically-loaded values
return iter(self._delegatee)
def __len__(self):
# not strictly accurate since we're not counting dynamically-loaded values
return len(self._delegatee)
class AnsibleEnvironment(Environment):
'''
Our custom environment, which simply allows us to override the class-level
values for the Template and Context classes used by jinja2 internally.
'''
context_class = AnsibleContext
template_class = AnsibleJ2Template
def __init__(self, *args, **kwargs):
super(AnsibleEnvironment, self).__init__(*args, **kwargs)
self.filters = JinjaPluginIntercept(self.filters, filter_loader)
self.tests = JinjaPluginIntercept(self.tests, test_loader)
class Templar:
'''
The main class for templating, with the main entry-point of template().
'''
def __init__(self, loader, shared_loader_obj=None, variables=None):
variables = {} if variables is None else variables
self._loader = loader
self._filters = None
self._tests = None
self._available_variables = variables
self._cached_result = {}
if loader:
self._basedir = loader.get_basedir()
else:
self._basedir = './'
if shared_loader_obj:
self._filter_loader = getattr(shared_loader_obj, 'filter_loader')
self._test_loader = getattr(shared_loader_obj, 'test_loader')
self._lookup_loader = getattr(shared_loader_obj, 'lookup_loader')
else:
self._filter_loader = filter_loader
self._test_loader = test_loader
self._lookup_loader = lookup_loader
# flags to determine whether certain failures during templating
# should result in fatal errors being raised
self._fail_on_lookup_errors = True
self._fail_on_filter_errors = True
self._fail_on_undefined_errors = C.DEFAULT_UNDEFINED_VAR_BEHAVIOR
self.environment = AnsibleEnvironment(
trim_blocks=True,
undefined=AnsibleUndefined,
extensions=self._get_extensions(),
finalize=self._finalize,
loader=FileSystemLoader(self._basedir),
)
# jinja2 global is inconsistent across versions, this normalizes them
self.environment.globals['dict'] = dict
# Custom globals
self.environment.globals['lookup'] = self._lookup
self.environment.globals['query'] = self.environment.globals['q'] = self._query_lookup
self.environment.globals['now'] = self._now_datetime
self.environment.globals['finalize'] = self._finalize
# the current rendering context under which the templar class is working
self.cur_context = None
self.SINGLE_VAR = re.compile(r"^%s\s*(\w*)\s*%s$" % (self.environment.variable_start_string, self.environment.variable_end_string))
self._clean_regex = re.compile(r'(?:%s|%s|%s|%s)' % (
self.environment.variable_start_string,
self.environment.block_start_string,
self.environment.block_end_string,
self.environment.variable_end_string
))
self._no_type_regex = re.compile(r'.*?\|\s*(?:%s)(?:\([^\|]*\))?\s*\)?\s*(?:%s)' %
('|'.join(C.STRING_TYPE_FILTERS), self.environment.variable_end_string))
def _get_filters(self):
'''
Returns filter plugins, after loading and caching them if need be
'''
if self._filters is not None:
return self._filters.copy()
self._filters = dict()
for fp in self._filter_loader.all():
self._filters.update(fp.filters())
return self._filters.copy()
def _get_tests(self):
'''
Returns tests plugins, after loading and caching them if need be
'''
if self._tests is not None:
return self._tests.copy()
self._tests = dict()
for fp in self._test_loader.all():
self._tests.update(fp.tests())
return self._tests.copy()
def _get_extensions(self):
'''
Return jinja2 extensions to load.
If some extensions are set via jinja_extensions in ansible.cfg, we try
to load them with the jinja environment.
'''
jinja_exts = []
if C.DEFAULT_JINJA2_EXTENSIONS:
# make sure the configuration directive doesn't contain spaces
# and split extensions in an array
jinja_exts = C.DEFAULT_JINJA2_EXTENSIONS.replace(" ", "").split(',')
return jinja_exts
@property
def available_variables(self):
return self._available_variables
@available_variables.setter
def available_variables(self, variables):
'''
Sets the list of template variables this Templar instance will use
to template things, so we don't have to pass them around between
internal methods. We also clear the template cache here, as the variables
are being changed.
'''
if not isinstance(variables, Mapping):
raise AnsibleAssertionError("the type of 'variables' should be a Mapping but was a %s" % (type(variables)))
self._available_variables = variables
self._cached_result = {}
def set_available_variables(self, variables):
display.deprecated(
'set_available_variables is being deprecated. Use "@available_variables.setter" instead.',
version='2.13', collection_name='ansible.builtin'
)
self.available_variables = variables
@contextmanager
def set_temporary_context(self, **kwargs):
"""Context manager used to set temporary templating context, without having to worry about resetting
original values afterward
Use a keyword that maps to the attr you are setting. Applies to ``self.environment`` by default, to
set context on another object, it must be in ``mapping``.
"""
mapping = {
'available_variables': self,
'searchpath': self.environment.loader,
}
original = {}
for key, value in kwargs.items():
obj = mapping.get(key, self.environment)
try:
original[key] = getattr(obj, key)
if value is not None:
setattr(obj, key, value)
except AttributeError:
# Ignore invalid attrs, lstrip_blocks was added in jinja2==2.7
pass
yield
for key in original:
obj = mapping.get(key, self.environment)
setattr(obj, key, original[key])
def template(self, variable, convert_bare=False, preserve_trailing_newlines=True, escape_backslashes=True, fail_on_undefined=None, overrides=None,
convert_data=True, static_vars=None, cache=True, disable_lookups=False):
'''
Templates (possibly recursively) any given data as input. If convert_bare is
set to True, the given data will be wrapped as a jinja2 variable ('{{foo}}')
before being sent through the template engine.
'''
static_vars = [''] if static_vars is None else static_vars
# Don't template unsafe variables, just return them.
if hasattr(variable, '__UNSAFE__'):
return variable
if fail_on_undefined is None:
fail_on_undefined = self._fail_on_undefined_errors
try:
if convert_bare:
variable = self._convert_bare_variable(variable)
if isinstance(variable, string_types):
result = variable
if self.is_possibly_template(variable):
# Check to see if the string we are trying to render is just referencing a single
# var. In this case we don't want to accidentally change the type of the variable
# to a string by using the jinja template renderer. We just want to pass it.
only_one = self.SINGLE_VAR.match(variable)
if only_one:
var_name = only_one.group(1)
if var_name in self._available_variables:
resolved_val = self._available_variables[var_name]
if isinstance(resolved_val, NON_TEMPLATED_TYPES):
return resolved_val
elif resolved_val is None:
return C.DEFAULT_NULL_REPRESENTATION
# Using a cache in order to prevent template calls with already templated variables
sha1_hash = None
if cache:
variable_hash = sha1(text_type(variable).encode('utf-8'))
options_hash = sha1(
(
text_type(preserve_trailing_newlines) +
text_type(escape_backslashes) +
text_type(fail_on_undefined) +
text_type(overrides)
).encode('utf-8')
)
sha1_hash = variable_hash.hexdigest() + options_hash.hexdigest()
if cache and sha1_hash in self._cached_result:
result = self._cached_result[sha1_hash]
else:
result = self.do_template(
variable,
preserve_trailing_newlines=preserve_trailing_newlines,
escape_backslashes=escape_backslashes,
fail_on_undefined=fail_on_undefined,
overrides=overrides,
disable_lookups=disable_lookups,
)
if not USE_JINJA2_NATIVE:
unsafe = hasattr(result, '__UNSAFE__')
if convert_data and not self._no_type_regex.match(variable):
# if this looks like a dictionary or list, convert it to such using the safe_eval method
if (result.startswith("{") and not result.startswith(self.environment.variable_start_string)) or \
result.startswith("[") or result in ("True", "False"):
eval_results = safe_eval(result, include_exceptions=True)
if eval_results[1] is None:
result = eval_results[0]
if unsafe:
result = wrap_var(result)
else:
# FIXME: if the safe_eval raised an error, should we do something with it?
pass
# we only cache in the case where we have a single variable
# name, to make sure we're not putting things which may otherwise
# be dynamic in the cache (filters, lookups, etc.)
if cache and only_one:
self._cached_result[sha1_hash] = result
return result
elif is_sequence(variable):
return [self.template(
v,
preserve_trailing_newlines=preserve_trailing_newlines,
fail_on_undefined=fail_on_undefined,
overrides=overrides,
disable_lookups=disable_lookups,
) for v in variable]
elif isinstance(variable, Mapping):
d = {}
# we don't use iteritems() here to avoid problems if the underlying dict
# changes sizes due to the templating, which can happen with hostvars
for k in variable.keys():
if k not in static_vars:
d[k] = self.template(
variable[k],
preserve_trailing_newlines=preserve_trailing_newlines,
fail_on_undefined=fail_on_undefined,
overrides=overrides,
disable_lookups=disable_lookups,
)
else:
d[k] = variable[k]
return d
else:
return variable
except AnsibleFilterError:
if self._fail_on_filter_errors:
raise
else:
return variable
def is_template(self, data):
'''lets us know if data has a template'''
if isinstance(data, string_types):
return is_template(data, self.environment)
elif isinstance(data, (list, tuple)):
for v in data:
if self.is_template(v):
return True
elif isinstance(data, dict):
for k in data:
if self.is_template(k) or self.is_template(data[k]):
return True
return False
templatable = is_template
def is_possibly_template(self, data):
'''Determines if a string looks like a template, by seeing if it
contains a jinja2 start delimiter. Does not guarantee that the string
is actually a template.
This is different than ``is_template`` which is more strict.
This method may return ``True`` on a string that is not templatable.
Useful when guarding passing a string for templating, but when
you want to allow the templating engine to make the final
assessment which may result in ``TemplateSyntaxError``.
'''
env = self.environment
if isinstance(data, string_types):
for marker in (env.block_start_string, env.variable_start_string, env.comment_start_string):
if marker in data:
return True
return False
def _convert_bare_variable(self, variable):
'''
Wraps a bare string, which may have an attribute portion (ie. foo.bar)
in jinja2 variable braces so that it is evaluated properly.
'''
if isinstance(variable, string_types):
contains_filters = "|" in variable
first_part = variable.split("|")[0].split(".")[0].split("[")[0]
if (contains_filters or first_part in self._available_variables) and self.environment.variable_start_string not in variable:
return "%s%s%s" % (self.environment.variable_start_string, variable, self.environment.variable_end_string)
# the variable didn't meet the conditions to be converted,
# so just return it as-is
return variable
def _finalize(self, thing):
'''
A custom finalize method for jinja2, which prevents None from being returned. This
avoids a string of ``"None"`` as ``None`` has no importance in YAML.
If using ANSIBLE_JINJA2_NATIVE we bypass this and return the actual value always
'''
if _is_rolled(thing):
# Auto unroll a generator, so that users are not required to
# explicitly use ``|list`` to unroll
# This only affects the scenario where the final result of templating
# is a generator, and not where a filter creates a generator in the middle
# of a template. See ``_unroll_iterator`` for the other case. This is probably
# unncessary
return list(thing)
if USE_JINJA2_NATIVE:
return thing
return thing if thing is not None else ''
def _fail_lookup(self, name, *args, **kwargs):
raise AnsibleError("The lookup `%s` was found, however lookups were disabled from templating" % name)
def _now_datetime(self, utc=False, fmt=None):
'''jinja2 global function to return current datetime, potentially formatted via strftime'''
if utc:
now = datetime.datetime.utcnow()
else:
now = datetime.datetime.now()
if fmt:
return now.strftime(fmt)
return now
def _query_lookup(self, name, *args, **kwargs):
''' wrapper for lookup, force wantlist true'''
kwargs['wantlist'] = True
return self._lookup(name, *args, **kwargs)
def _lookup(self, name, *args, **kwargs):
instance = self._lookup_loader.get(name, loader=self._loader, templar=self)
if instance is not None:
wantlist = kwargs.pop('wantlist', False)
allow_unsafe = kwargs.pop('allow_unsafe', C.DEFAULT_ALLOW_UNSAFE_LOOKUPS)
errors = kwargs.pop('errors', 'strict')
from ansible.utils.listify import listify_lookup_plugin_terms
loop_terms = listify_lookup_plugin_terms(terms=args, templar=self, loader=self._loader, fail_on_undefined=True, convert_bare=False)
# safely catch run failures per #5059
try:
ran = instance.run(loop_terms, variables=self._available_variables, **kwargs)
except (AnsibleUndefinedVariable, UndefinedError) as e:
raise AnsibleUndefinedVariable(e)
except Exception as e:
if self._fail_on_lookup_errors:
msg = u"An unhandled exception occurred while running the lookup plugin '%s'. Error was a %s, original message: %s" % \
(name, type(e), to_text(e))
if errors == 'warn':
display.warning(msg)
elif errors == 'ignore':
display.display(msg, log_only=True)
else:
raise AnsibleError(to_native(msg))
ran = [] if wantlist else None
if ran and not allow_unsafe:
if wantlist:
ran = wrap_var(ran)
else:
try:
ran = wrap_var(",".join(ran))
except TypeError:
# Lookup Plugins should always return lists. Throw an error if that's not
# the case:
if not isinstance(ran, Sequence):
raise AnsibleError("The lookup plugin '%s' did not return a list."
% name)
# The TypeError we can recover from is when the value *inside* of the list
# is not a string
if len(ran) == 1:
ran = wrap_var(ran[0])
else:
ran = wrap_var(ran)
if self.cur_context:
self.cur_context.unsafe = True
return ran
else:
raise AnsibleError("lookup plugin (%s) not found" % name)
def do_template(self, data, preserve_trailing_newlines=True, escape_backslashes=True, fail_on_undefined=None, overrides=None, disable_lookups=False):
if USE_JINJA2_NATIVE and not isinstance(data, string_types):
return data
# For preserving the number of input newlines in the output (used
# later in this method)
data_newlines = _count_newlines_from_end(data)
if fail_on_undefined is None:
fail_on_undefined = self._fail_on_undefined_errors
try:
# allows template header overrides to change jinja2 options.
if overrides is None:
myenv = self.environment.overlay()
else:
myenv = self.environment.overlay(overrides)
# Get jinja env overrides from template
if hasattr(data, 'startswith') and data.startswith(JINJA2_OVERRIDE):
eol = data.find('\n')
line = data[len(JINJA2_OVERRIDE):eol]
data = data[eol + 1:]
for pair in line.split(','):
(key, val) = pair.split(':')
key = key.strip()
setattr(myenv, key, ast.literal_eval(val.strip()))
# Adds Ansible custom filters and tests
myenv.filters.update(self._get_filters())
for k in myenv.filters:
myenv.filters[k] = _unroll_iterator(myenv.filters[k])
myenv.tests.update(self._get_tests())
if escape_backslashes:
# Allow users to specify backslashes in playbooks as "\\" instead of as "\\\\".
data = _escape_backslashes(data, myenv)
try:
t = myenv.from_string(data)
except TemplateSyntaxError as e:
raise AnsibleError("template error while templating string: %s. String: %s" % (to_native(e), to_native(data)))
except Exception as e:
if 'recursion' in to_native(e):
raise AnsibleError("recursive loop detected in template string: %s" % to_native(data))
else:
return data
if disable_lookups:
t.globals['query'] = t.globals['q'] = t.globals['lookup'] = self._fail_lookup
jvars = AnsibleJ2Vars(self, t.globals)
self.cur_context = new_context = t.new_context(jvars, shared=True)
rf = t.root_render_func(new_context)
try:
res = j2_concat(rf)
if getattr(new_context, 'unsafe', False):
res = wrap_var(res)
except TypeError as te:
if 'AnsibleUndefined' in to_native(te):
errmsg = "Unable to look up a name or access an attribute in template string (%s).\n" % to_native(data)
errmsg += "Make sure your variable name does not contain invalid characters like '-': %s" % to_native(te)
raise AnsibleUndefinedVariable(errmsg)
else:
display.debug("failing because of a type error, template data is: %s" % to_text(data))
raise AnsibleError("Unexpected templating type error occurred on (%s): %s" % (to_native(data), to_native(te)))
if USE_JINJA2_NATIVE and not isinstance(res, string_types):
return res
if preserve_trailing_newlines:
# The low level calls above do not preserve the newline
# characters at the end of the input data, so we use the
# calculate the difference in newlines and append them
# to the resulting output for parity
#
# jinja2 added a keep_trailing_newline option in 2.7 when
# creating an Environment. That would let us make this code
# better (remove a single newline if
# preserve_trailing_newlines is False). Once we can depend on
# that version being present, modify our code to set that when
# initializing self.environment and remove a single trailing
# newline here if preserve_newlines is False.
res_newlines = _count_newlines_from_end(res)
if data_newlines > res_newlines:
res += self.environment.newline_sequence * (data_newlines - res_newlines)
return res
except (UndefinedError, AnsibleUndefinedVariable) as e:
if fail_on_undefined:
raise AnsibleUndefinedVariable(e)
else:
display.debug("Ignoring undefined failure: %s" % to_text(e))
return data
# for backwards compatibility in case anyone is using old private method directly
_do_template = do_template