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"""
Custom YAML loading in Salt
"""
import re
import yaml # pylint: disable=blacklisted-import
from yaml.constructor import ConstructorError
from yaml.nodes import MappingNode, SequenceNode
import salt.utils.stringutils
try:
yaml.Loader = yaml.CLoader
yaml.Dumper = yaml.CDumper
except Exception: # pylint: disable=broad-except
pass
__all__ = ["SaltYamlSafeLoader", "load", "safe_load"]
# with code integrated from https://gist.github.com/844388
class SaltYamlSafeLoader(yaml.SafeLoader):
"""
Create a custom YAML loader that uses the custom constructor. This allows
for the YAML loading defaults to be manipulated based on needs within salt
to make things like sls file more intuitive.
"""
def __init__(self, stream, dictclass=dict):
super().__init__(stream)
if dictclass is not dict:
# then assume ordered dict and use it for both !map and !omap
self.add_constructor("tag:yaml.org,2002:map", type(self).construct_yaml_map)
self.add_constructor(
"tag:yaml.org,2002:omap", type(self).construct_yaml_map
)
self.add_constructor("tag:yaml.org,2002:str", type(self).construct_yaml_str)
self.add_constructor(
"tag:yaml.org,2002:python/unicode", type(self).construct_unicode
)
self.add_constructor("tag:yaml.org,2002:timestamp", type(self).construct_scalar)
self.dictclass = dictclass
def construct_yaml_map(self, node):
data = self.dictclass()
yield data
value = self.construct_mapping(node)
data.update(value)
def construct_unicode(self, node):
return node.value
def construct_mapping(self, node, deep=False):
"""
Build the mapping for YAML
"""
if not isinstance(node, MappingNode):
raise ConstructorError(
None,
None,
f"expected a mapping node, but found {node.id}",
node.start_mark,
)
self.flatten_mapping(node)
context = "while constructing a mapping"
mapping = self.dictclass()
for key_node, value_node in node.value:
key = self.construct_object(key_node, deep=deep)
try:
hash(key)
except TypeError:
raise ConstructorError(
context,
node.start_mark,
f"found unacceptable key {key_node.value}",
key_node.start_mark,
)
value = self.construct_object(value_node, deep=deep)
if key in mapping:
raise ConstructorError(
context,
node.start_mark,
f"found conflicting ID '{key}'",
key_node.start_mark,
)
mapping[key] = value
return mapping
def construct_scalar(self, node):
"""
Verify integers and pass them in correctly is they are declared
as octal
"""
if node.tag == "tag:yaml.org,2002:int":
if node.value == "0":
pass
elif node.value.startswith("0") and not node.value.startswith(("0b", "0x")):
node.value = node.value.lstrip("0")
# If value was all zeros, node.value would have been reduced to
# an empty string. Change it to '0'.
if node.value == "":
node.value = "0"
elif node.tag == "tag:yaml.org,2002:str":
# If any string comes in as a quoted unicode literal, eval it into
# the proper unicode string type.
if re.match(r'^u([\'"]).+\1$', node.value, flags=re.IGNORECASE):
node.value = eval(node.value, {}, {}) # pylint: disable=W0123
return super().construct_scalar(node)
def construct_yaml_str(self, node):
value = self.construct_scalar(node)
return salt.utils.stringutils.to_unicode(value)
def fetch_plain(self):
"""
Handle unicode literal strings which appear inline in the YAML
"""
orig_line = self.line
orig_column = self.column
orig_pointer = self.pointer
try:
return super().fetch_plain()
except yaml.scanner.ScannerError as exc:
problem_line = self.line
problem_column = self.column
problem_pointer = self.pointer
if exc.problem == "found unexpected ':'":
# Reset to prior position
self.line = orig_line
self.column = orig_column
self.pointer = orig_pointer
if self.peek(0) == "u":
# Might be a unicode literal string, check for 2nd char and
# call the appropriate fetch func if it's a quote
quote_char = self.peek(1)
if quote_char in ("'", '"'):
# Skip the "u" prefix by advancing the column and
# pointer by 1
self.column += 1
self.pointer += 1
if quote_char == "'":
return self.fetch_single()
else:
return self.fetch_double()
else:
# This wasn't a unicode literal string, so the caught
# exception was correct. Restore the old position and
# then raise the caught exception.
self.line = problem_line
self.column = problem_column
self.pointer = problem_pointer
# Raise the caught exception
raise exc
def flatten_mapping(self, node):
merge = []
index = 0
while index < len(node.value):
key_node, value_node = node.value[index]
if key_node.tag == "tag:yaml.org,2002:merge":
del node.value[index]
if isinstance(value_node, MappingNode):
self.flatten_mapping(value_node)
merge.extend(value_node.value)
elif isinstance(value_node, SequenceNode):
submerge = []
for subnode in value_node.value:
if not isinstance(subnode, MappingNode):
raise ConstructorError(
"while constructing a mapping",
node.start_mark,
"expected a mapping for merging, but found {}".format(
subnode.id
),
subnode.start_mark,
)
self.flatten_mapping(subnode)
submerge.append(subnode.value)
submerge.reverse()
for value in submerge:
merge.extend(value)
else:
raise ConstructorError(
"while constructing a mapping",
node.start_mark,
"expected a mapping or list of mappings for merging, but"
" found {}".format(value_node.id),
value_node.start_mark,
)
elif key_node.tag == "tag:yaml.org,2002:value":
key_node.tag = "tag:yaml.org,2002:str"
index += 1
else:
index += 1
if merge:
# Here we need to discard any duplicate entries based on key_node
existing_nodes = [name_node.value for name_node, value_node in node.value]
mergeable_items = [x for x in merge if x[0].value not in existing_nodes]
node.value = mergeable_items + node.value
def load(stream, Loader=SaltYamlSafeLoader):
return yaml.load(stream, Loader=Loader)
def safe_load(stream, Loader=SaltYamlSafeLoader):
"""
.. versionadded:: 2018.3.0
Helper function which automagically uses our custom loader.
"""
return yaml.load(stream, Loader=Loader)