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Diffstat (limited to 'venv/lib/python3.11/site-packages/dotenv/main.py')
| -rw-r--r-- | venv/lib/python3.11/site-packages/dotenv/main.py | 392 |
1 files changed, 392 insertions, 0 deletions
diff --git a/venv/lib/python3.11/site-packages/dotenv/main.py b/venv/lib/python3.11/site-packages/dotenv/main.py new file mode 100644 index 0000000..7bc5428 --- /dev/null +++ b/venv/lib/python3.11/site-packages/dotenv/main.py @@ -0,0 +1,392 @@ +import io +import logging +import os +import pathlib +import shutil +import sys +import tempfile +from collections import OrderedDict +from contextlib import contextmanager +from typing import (IO, Dict, Iterable, Iterator, Mapping, Optional, Tuple, + Union) + +from .parser import Binding, parse_stream +from .variables import parse_variables + +# A type alias for a string path to be used for the paths in this file. +# These paths may flow to `open()` and `shutil.move()`; `shutil.move()` +# only accepts string paths, not byte paths or file descriptors. See +# https://github.com/python/typeshed/pull/6832. +StrPath = Union[str, 'os.PathLike[str]'] + +logger = logging.getLogger(__name__) + + +def with_warn_for_invalid_lines(mappings: Iterator[Binding]) -> Iterator[Binding]: + for mapping in mappings: + if mapping.error: + logger.warning( + "Python-dotenv could not parse statement starting at line %s", + mapping.original.line, + ) + yield mapping + + +class DotEnv: + def __init__( + self, + dotenv_path: Optional[StrPath], + stream: Optional[IO[str]] = None, + verbose: bool = False, + encoding: Optional[str] = None, + interpolate: bool = True, + override: bool = True, + ) -> None: + self.dotenv_path: Optional[StrPath] = dotenv_path + self.stream: Optional[IO[str]] = stream + self._dict: Optional[Dict[str, Optional[str]]] = None + self.verbose: bool = verbose + self.encoding: Optional[str] = encoding + self.interpolate: bool = interpolate + self.override: bool = override + + @contextmanager + def _get_stream(self) -> Iterator[IO[str]]: + if self.dotenv_path and os.path.isfile(self.dotenv_path): + with open(self.dotenv_path, encoding=self.encoding) as stream: + yield stream + elif self.stream is not None: + yield self.stream + else: + if self.verbose: + logger.info( + "Python-dotenv could not find configuration file %s.", + self.dotenv_path or '.env', + ) + yield io.StringIO('') + + def dict(self) -> Dict[str, Optional[str]]: + """Return dotenv as dict""" + if self._dict: + return self._dict + + raw_values = self.parse() + + if self.interpolate: + self._dict = OrderedDict(resolve_variables(raw_values, override=self.override)) + else: + self._dict = OrderedDict(raw_values) + + return self._dict + + def parse(self) -> Iterator[Tuple[str, Optional[str]]]: + with self._get_stream() as stream: + for mapping in with_warn_for_invalid_lines(parse_stream(stream)): + if mapping.key is not None: + yield mapping.key, mapping.value + + def set_as_environment_variables(self) -> bool: + """ + Load the current dotenv as system environment variable. + """ + if not self.dict(): + return False + + for k, v in self.dict().items(): + if k in os.environ and not self.override: + continue + if v is not None: + os.environ[k] = v + + return True + + def get(self, key: str) -> Optional[str]: + """ + """ + data = self.dict() + + if key in data: + return data[key] + + if self.verbose: + logger.warning("Key %s not found in %s.", key, self.dotenv_path) + + return None + + +def get_key( + dotenv_path: StrPath, + key_to_get: str, + encoding: Optional[str] = "utf-8", +) -> Optional[str]: + """ + Get the value of a given key from the given .env. + + Returns `None` if the key isn't found or doesn't have a value. + """ + return DotEnv(dotenv_path, verbose=True, encoding=encoding).get(key_to_get) + + +@contextmanager +def rewrite( + path: StrPath, + encoding: Optional[str], +) -> Iterator[Tuple[IO[str], IO[str]]]: + pathlib.Path(path).touch() + + with tempfile.NamedTemporaryFile(mode="w", encoding=encoding, delete=False) as dest: + error = None + try: + with open(path, encoding=encoding) as source: + yield (source, dest) + except BaseException as err: + error = err + + if error is None: + shutil.move(dest.name, path) + else: + os.unlink(dest.name) + raise error from None + + +def set_key( + dotenv_path: StrPath, + key_to_set: str, + value_to_set: str, + quote_mode: str = "always", + export: bool = False, + encoding: Optional[str] = "utf-8", +) -> Tuple[Optional[bool], str, str]: + """ + Adds or Updates a key/value to the given .env + + If the .env path given doesn't exist, fails instead of risking creating + an orphan .env somewhere in the filesystem + """ + if quote_mode not in ("always", "auto", "never"): + raise ValueError(f"Unknown quote_mode: {quote_mode}") + + quote = ( + quote_mode == "always" + or (quote_mode == "auto" and not value_to_set.isalnum()) + ) + + if quote: + value_out = "'{}'".format(value_to_set.replace("'", "\\'")) + else: + value_out = value_to_set + if export: + line_out = f'export {key_to_set}={value_out}\n' + else: + line_out = f"{key_to_set}={value_out}\n" + + with rewrite(dotenv_path, encoding=encoding) as (source, dest): + replaced = False + missing_newline = False + for mapping in with_warn_for_invalid_lines(parse_stream(source)): + if mapping.key == key_to_set: + dest.write(line_out) + replaced = True + else: + dest.write(mapping.original.string) + missing_newline = not mapping.original.string.endswith("\n") + if not replaced: + if missing_newline: + dest.write("\n") + dest.write(line_out) + + return True, key_to_set, value_to_set + + +def unset_key( + dotenv_path: StrPath, + key_to_unset: str, + quote_mode: str = "always", + encoding: Optional[str] = "utf-8", +) -> Tuple[Optional[bool], str]: + """ + Removes a given key from the given `.env` file. + + If the .env path given doesn't exist, fails. + If the given key doesn't exist in the .env, fails. + """ + if not os.path.exists(dotenv_path): + logger.warning("Can't delete from %s - it doesn't exist.", dotenv_path) + return None, key_to_unset + + removed = False + with rewrite(dotenv_path, encoding=encoding) as (source, dest): + for mapping in with_warn_for_invalid_lines(parse_stream(source)): + if mapping.key == key_to_unset: + removed = True + else: + dest.write(mapping.original.string) + + if not removed: + logger.warning("Key %s not removed from %s - key doesn't exist.", key_to_unset, dotenv_path) + return None, key_to_unset + + return removed, key_to_unset + + +def resolve_variables( + values: Iterable[Tuple[str, Optional[str]]], + override: bool, +) -> Mapping[str, Optional[str]]: + new_values: Dict[str, Optional[str]] = {} + + for (name, value) in values: + if value is None: + result = None + else: + atoms = parse_variables(value) + env: Dict[str, Optional[str]] = {} + if override: + env.update(os.environ) # type: ignore + env.update(new_values) + else: + env.update(new_values) + env.update(os.environ) # type: ignore + result = "".join(atom.resolve(env) for atom in atoms) + + new_values[name] = result + + return new_values + + +def _walk_to_root(path: str) -> Iterator[str]: + """ + Yield directories starting from the given directory up to the root + """ + if not os.path.exists(path): + raise IOError('Starting path not found') + + if os.path.isfile(path): + path = os.path.dirname(path) + + last_dir = None + current_dir = os.path.abspath(path) + while last_dir != current_dir: + yield current_dir + parent_dir = os.path.abspath(os.path.join(current_dir, os.path.pardir)) + last_dir, current_dir = current_dir, parent_dir + + +def find_dotenv( + filename: str = '.env', + raise_error_if_not_found: bool = False, + usecwd: bool = False, +) -> str: + """ + Search in increasingly higher folders for the given file + + Returns path to the file if found, or an empty string otherwise + """ + + def _is_interactive(): + """ Decide whether this is running in a REPL or IPython notebook """ + try: + main = __import__('__main__', None, None, fromlist=['__file__']) + except ModuleNotFoundError: + return False + return not hasattr(main, '__file__') + + if usecwd or _is_interactive() or getattr(sys, 'frozen', False): + # Should work without __file__, e.g. in REPL or IPython notebook. + path = os.getcwd() + else: + # will work for .py files + frame = sys._getframe() + current_file = __file__ + + while frame.f_code.co_filename == current_file or not os.path.exists( + frame.f_code.co_filename + ): + assert frame.f_back is not None + frame = frame.f_back + frame_filename = frame.f_code.co_filename + path = os.path.dirname(os.path.abspath(frame_filename)) + + for dirname in _walk_to_root(path): + check_path = os.path.join(dirname, filename) + if os.path.isfile(check_path): + return check_path + + if raise_error_if_not_found: + raise IOError('File not found') + + return '' + + +def load_dotenv( + dotenv_path: Optional[StrPath] = None, + stream: Optional[IO[str]] = None, + verbose: bool = False, + override: bool = False, + interpolate: bool = True, + encoding: Optional[str] = "utf-8", +) -> bool: + """Parse a .env file and then load all the variables found as environment variables. + + Parameters: + dotenv_path: Absolute or relative path to .env file. + stream: Text stream (such as `io.StringIO`) with .env content, used if + `dotenv_path` is `None`. + verbose: Whether to output a warning the .env file is missing. + override: Whether to override the system environment variables with the variables + from the `.env` file. + encoding: Encoding to be used to read the file. + Returns: + Bool: True if at least one environment variable is set else False + + If both `dotenv_path` and `stream` are `None`, `find_dotenv()` is used to find the + .env file. + """ + if dotenv_path is None and stream is None: + dotenv_path = find_dotenv() + + dotenv = DotEnv( + dotenv_path=dotenv_path, + stream=stream, + verbose=verbose, + interpolate=interpolate, + override=override, + encoding=encoding, + ) + return dotenv.set_as_environment_variables() + + +def dotenv_values( + dotenv_path: Optional[StrPath] = None, + stream: Optional[IO[str]] = None, + verbose: bool = False, + interpolate: bool = True, + encoding: Optional[str] = "utf-8", +) -> Dict[str, Optional[str]]: + """ + Parse a .env file and return its content as a dict. + + The returned dict will have `None` values for keys without values in the .env file. + For example, `foo=bar` results in `{"foo": "bar"}` whereas `foo` alone results in + `{"foo": None}` + + Parameters: + dotenv_path: Absolute or relative path to the .env file. + stream: `StringIO` object with .env content, used if `dotenv_path` is `None`. + verbose: Whether to output a warning if the .env file is missing. + encoding: Encoding to be used to read the file. + + If both `dotenv_path` and `stream` are `None`, `find_dotenv()` is used to find the + .env file. + """ + if dotenv_path is None and stream is None: + dotenv_path = find_dotenv() + + return DotEnv( + dotenv_path=dotenv_path, + stream=stream, + verbose=verbose, + interpolate=interpolate, + override=True, + encoding=encoding, + ).dict() |