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python3
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dist-packages
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certbot_nginx
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nginxparser.py
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"""Very low-level nginx config parser based on pyparsing.""" # Forked from https://github.com/fatiherikli/nginxparser (MIT Licensed) import copy import logging import operator import typing from typing import Any from typing import IO from typing import Iterable from typing import Iterator from typing import List from typing import overload from typing import SupportsIndex from typing import Tuple from typing import Union from pyparsing import Combine from pyparsing import Forward from pyparsing import Group from pyparsing import Literal from pyparsing import Optional from pyparsing import ParseResults from pyparsing import QuotedString from pyparsing import Regex from pyparsing import restOfLine from pyparsing import stringEnd from pyparsing import White from pyparsing import ZeroOrMore logger = logging.getLogger(__name__) class RawNginxParser: # pylint: disable=pointless-statement """A class that parses nginx configuration with pyparsing.""" # constants space = Optional(White()).leaveWhitespace() required_space = White().leaveWhitespace() left_bracket = Literal("{").suppress() right_bracket = space + Literal("}").suppress() semicolon = Literal(";").suppress() dquoted = QuotedString('"', multiline=True, unquoteResults=False, escChar='\\') squoted = QuotedString("'", multiline=True, unquoteResults=False, escChar='\\') quoted = dquoted | squoted head_tokenchars = Regex(r"(\$\{)|[^{};\s'\"]") # if (last_space) tail_tokenchars = Regex(r"(\$\{)|[^{;\s]") # else tokenchars = Combine(head_tokenchars + ZeroOrMore(tail_tokenchars)) paren_quote_extend = Combine(quoted + Literal(')') + ZeroOrMore(tail_tokenchars)) # note: ')' allows extension, but then we fall into else, not last_space. token = paren_quote_extend | tokenchars | quoted whitespace_token_group = space + token + ZeroOrMore(required_space + token) + space assignment = whitespace_token_group + semicolon comment = space + Literal('#') + restOfLine block = Forward() # order matters! see issue 518, and also http { # server { \n} contents = Group(comment) | Group(block) | Group(assignment) block_begin = Group(whitespace_token_group) block_innards = Group(ZeroOrMore(contents) + space).leaveWhitespace() block << block_begin + left_bracket + block_innards + right_bracket script = ZeroOrMore(contents) + space + stringEnd script.parseWithTabs().leaveWhitespace() def __init__(self, source: str) -> None: self.source = source def parse(self) -> ParseResults: """Returns the parsed tree.""" return self.script.parseString(self.source) def as_list(self) -> List[Any]: """Returns the parsed tree as a list.""" return self.parse().asList() class RawNginxDumper: """A class that dumps nginx configuration from the provided tree.""" def __init__(self, blocks: List[Any]) -> None: self.blocks = blocks def __iter__(self, blocks: typing.Optional[List[Any]] = None) -> Iterator[str]: """Iterates the dumped nginx content.""" blocks = blocks or self.blocks for b0 in blocks: if isinstance(b0, str): yield b0 continue item = copy.deepcopy(b0) if spacey(item[0]): yield item.pop(0) # indentation if not item: continue if isinstance(item[0], list): # block yield "".join(item.pop(0)) + '{' for parameter in item.pop(0): for line in self.__iter__([parameter]): # negate "for b0 in blocks" yield line yield '}' else: # not a block - list of strings semicolon = ";" if isinstance(item[0], str) and item[0].strip() == '#': # comment semicolon = "" yield "".join(item) + semicolon def __str__(self) -> str: """Return the parsed block as a string.""" return ''.join(self) def spacey(x: Any) -> bool: """Is x an empty string or whitespace?""" return (isinstance(x, str) and x.isspace()) or x == '' class UnspacedList(List[Any]): """Wrap a list [of lists], making any whitespace entries magically invisible""" def __init__(self, list_source: Iterable[Any]) -> None: # ensure our argument is not a generator, and duplicate any sublists self.spaced = copy.deepcopy(list(list_source)) self.dirty = False # Turn self into a version of the source list that has spaces removed # and all sub-lists also UnspacedList()ed super().__init__(list_source) for i, entry in reversed(list(enumerate(self))): if isinstance(entry, list): sublist = UnspacedList(entry) super().__setitem__(i, sublist) self.spaced[i] = sublist.spaced elif spacey(entry): # don't delete comments if "#" not in self[:i]: super().__delitem__(i) @overload def _coerce(self, inbound: None) -> Tuple[None, None]: ... @overload def _coerce(self, inbound: str) -> Tuple[str, str]: ... @overload def _coerce(self, inbound: List[Any]) -> Tuple["UnspacedList", List[Any]]: ... def _coerce(self, inbound: Any) -> Tuple[Any, Any]: """ Coerce some inbound object to be appropriately usable in this object :param inbound: string or None or list or UnspacedList :returns: (coerced UnspacedList or string or None, spaced equivalent) :rtype: tuple """ if not isinstance(inbound, list): # str or None return inbound, inbound else: if not hasattr(inbound, "spaced"): inbound = UnspacedList(inbound) return inbound, inbound.spaced def insert(self, i: "SupportsIndex", x: Any) -> None: """Insert object before index.""" idx = operator.index(i) item, spaced_item = self._coerce(x) slicepos = self._spaced_position(idx) if idx < len(self) else len(self.spaced) self.spaced.insert(slicepos, spaced_item) if not spacey(item): super().insert(idx, item) self.dirty = True def append(self, x: Any) -> None: """Append object to the end of the list.""" item, spaced_item = self._coerce(x) self.spaced.append(spaced_item) if not spacey(item): super().append(item) self.dirty = True def extend(self, x: Any) -> None: """Extend list by appending elements from the iterable.""" item, spaced_item = self._coerce(x) self.spaced.extend(spaced_item) super().extend(item) self.dirty = True def __add__(self, other: List[Any]) -> "UnspacedList": new_list = copy.deepcopy(self) new_list.extend(other) new_list.dirty = True return new_list def pop(self, *args: Any, **kwargs: Any) -> None: """Function pop() is not implemented for UnspacedList""" raise NotImplementedError("UnspacedList.pop() not yet implemented") def remove(self, *args: Any, **kwargs: Any) -> None: """Function remove() is not implemented for UnspacedList""" raise NotImplementedError("UnspacedList.remove() not yet implemented") def reverse(self) -> None: """Function reverse() is not implemented for UnspacedList""" raise NotImplementedError("UnspacedList.reverse() not yet implemented") def sort(self, *_args: Any, **_kwargs: Any) -> None: """Function sort() is not implemented for UnspacedList""" raise NotImplementedError("UnspacedList.sort() not yet implemented") def __setslice__(self, *args: Any, **kwargs: Any) -> None: raise NotImplementedError("Slice operations on UnspacedLists not yet implemented") def __setitem__(self, i: Union["SupportsIndex", slice], value: Any) -> None: if isinstance(i, slice): raise NotImplementedError("Slice operations on UnspacedLists not yet implemented") item, spaced_item = self._coerce(value) self.spaced.__setitem__(self._spaced_position(i), spaced_item) if not spacey(item): super().__setitem__(i, item) self.dirty = True def __delitem__(self, i: Union["SupportsIndex", slice]) -> None: if isinstance(i, slice): raise NotImplementedError("Slice operations on UnspacedLists not yet implemented") self.spaced.__delitem__(self._spaced_position(i)) super().__delitem__(i) self.dirty = True def __deepcopy__(self, memo: Any) -> "UnspacedList": new_spaced = copy.deepcopy(self.spaced, memo=memo) new_list = UnspacedList(new_spaced) new_list.dirty = self.dirty return new_list def is_dirty(self) -> bool: """Recurse through the parse tree to figure out if any sublists are dirty""" if self.dirty: return True return any((isinstance(x, UnspacedList) and x.is_dirty() for x in self)) def _spaced_position(self, idx: "SupportsIndex") -> int: """Convert from indexes in the unspaced list to positions in the spaced one""" int_idx = operator.index(idx) pos = spaces = 0 # Normalize indexes like list[-1] etc, and save the result if int_idx < 0: int_idx = len(self) + int_idx if not 0 <= int_idx < len(self): raise IndexError("list index out of range") int_idx0 = int_idx # Count the number of spaces in the spaced list before int_idx in the unspaced one while int_idx != -1: if spacey(self.spaced[pos]): spaces += 1 else: int_idx -= 1 pos += 1 return int_idx0 + spaces # Shortcut functions to respect Python's serialization interface # (like pyyaml, picker or json) def loads(source: str) -> UnspacedList: """Parses from a string. :param str source: The string to parse :returns: The parsed tree :rtype: list """ return UnspacedList(RawNginxParser(source).as_list()) def load(file_: IO[Any]) -> UnspacedList: """Parses from a file. :param file file_: The file to parse :returns: The parsed tree :rtype: list """ return loads(file_.read()) def dumps(blocks: UnspacedList) -> str: """Dump to a Unicode string. :param UnspacedList blocks: The parsed tree :rtype: six.text_type """ return str(RawNginxDumper(blocks.spaced)) def dump(blocks: UnspacedList, file_: IO[Any]) -> None: """Dump to a file. :param UnspacedList blocks: The parsed tree :param IO[Any] file_: The file stream to dump to. It must be opened with Unicode encoding. :rtype: None """ file_.write(dumps(blocks))