"""Parsing and processing of CLI input (args, auth credentials, files, stdin). """ import os import sys import re import json import mimetypes import getpass from io import BytesIO from argparse import ArgumentParser, ArgumentTypeError, ArgumentError try: from collections import OrderedDict except ImportError: OrderedDict = dict # TODO: Use MultiDict for headers once added to `requests`. # https://github.com/jkbr/httpie/issues/130 from requests.structures import CaseInsensitiveDict from .compat import urlsplit, str HTTP_POST = 'POST' HTTP_GET = 'GET' HTTP = 'http://' HTTPS = 'https://' # Various separators used in args SEP_HEADERS = ':' SEP_CREDENTIALS = ':' SEP_PROXY = ':' SEP_DATA = '=' SEP_DATA_RAW_JSON = ':=' SEP_FILES = '@' SEP_QUERY = '==' # Separators that become request data SEP_GROUP_DATA_ITEMS = frozenset([ SEP_DATA, SEP_DATA_RAW_JSON, SEP_FILES ]) # Separators allowed in ITEM arguments SEP_GROUP_ITEMS = frozenset([ SEP_HEADERS, SEP_QUERY, SEP_DATA, SEP_DATA_RAW_JSON, SEP_FILES ]) # Output options OUT_REQ_HEAD = 'H' OUT_REQ_BODY = 'B' OUT_RESP_HEAD = 'h' OUT_RESP_BODY = 'b' OUTPUT_OPTIONS = frozenset([ OUT_REQ_HEAD, OUT_REQ_BODY, OUT_RESP_HEAD, OUT_RESP_BODY ]) # Pretty PRETTY_MAP = { 'all': ['format', 'colors'], 'colors': ['colors'], 'format': ['format'], 'none': [] } PRETTY_STDOUT_TTY_ONLY = object() # Defaults OUTPUT_OPTIONS_DEFAULT = OUT_RESP_HEAD + OUT_RESP_BODY OUTPUT_OPTIONS_DEFAULT_STDOUT_REDIRECTED = OUT_RESP_BODY class Parser(ArgumentParser): """Adds additional logic to `argparse.ArgumentParser`. Handles all input (CLI args, file args, stdin), applies defaults, and performs extra validation. """ def __init__(self, *args, **kwargs): kwargs['add_help'] = False super(Parser, self).__init__(*args, **kwargs) #noinspection PyMethodOverriding def parse_args(self, env, args=None, namespace=None): self.env = env self.args, no_options = super(Parser, self)\ .parse_known_args(args, namespace) if self.args.debug: self.args.traceback = True # Arguments processing and environment setup. self._apply_no_options(no_options) self._apply_config() self._setup_standard_streams() self._validate_download_options() self._process_output_options() self._process_pretty_options() self._guess_method() self._parse_items() if not env.stdin_isatty: self._body_from_file(self.env.stdin) if not (self.args.url.startswith(HTTP) or self.args.url.startswith(HTTPS)): # Default to 'https://' if invoked as `https args`. scheme = HTTPS if self.env.progname == 'https' else HTTP self.args.url = scheme + self.args.url self._process_auth() return self.args # noinspection PyShadowingBuiltins def _print_message(self, message, file=None): # Sneak in our stderr/stdout. file = { sys.stdout: self.env.stdout, sys.stderr: self.env.stderr, None: self.env.stderr }.get(file, file) super(Parser, self)._print_message(message, file) def _setup_standard_streams(self): """ Modify `env.stdout` and `env.stdout_isatty` based on args, if needed. """ if self.args.download: # With `--download`, we write everything that would normally go to # `stdout` to `stderr` instead. Let's replace the stream so that # we don't have to use many `if`s throughout the codebase. # The response body will be treated separately. self.env.stdout = self.env.stderr self.env.stdout_isatty = self.env.stderr_isatty elif self.args.output_file: # When not `--download`ing, then `--output` simply replaces # `stdout`. The file is opened for appending, which isn't what # we want in this case. self.args.output_file.seek(0) self.args.output_file.truncate() self.env.stdout = self.args.output_file self.env.stdout_isatty = False def _apply_config(self): if (not self.args.json and self.env.config.implicit_content_type == 'form'): self.args.form = True def _process_auth(self): """ If only a username provided via --auth, then ask for a password. Or, take credentials from the URL, if provided. """ url = urlsplit(self.args.url) if self.args.auth: if not self.args.auth.has_password(): # Stdin already read (if not a tty) so it's save to prompt. self.args.auth.prompt_password(url.netloc) elif url.username is not None: # Handle http://username:password@hostname/ username, password = url.username, url.password self.args.auth = AuthCredentials( key=username, value=password, sep=SEP_CREDENTIALS, orig=SEP_CREDENTIALS.join([username, password]) ) def _apply_no_options(self, no_options): """For every `--no-OPTION` in `no_options`, set `args.OPTION` to its default value. This allows for un-setting of options, e.g., specified in config. """ invalid = [] for option in no_options: if not option.startswith('--no-'): invalid.append(option) continue # --no-option => --option inverted = '--' + option[5:] for action in self._actions: if inverted in action.option_strings: setattr(self.args, action.dest, action.default) break else: invalid.append(option) if invalid: msg = 'unrecognized arguments: %s' self.error(msg % ' '.join(invalid)) def _body_from_file(self, fd): """There can only be one source of request data. Bytes are always read. """ if self.args.data: self.error('Request body (from stdin or a file) and request ' 'data (key=value) cannot be mixed.') self.args.data = getattr(fd, 'buffer', fd).read() def _guess_method(self): """Set `args.method` if not specified to either POST or GET based on whether the request has data or not. """ if self.args.method is None: # Invoked as `http URL'. assert not self.args.items if not self.env.stdin_isatty: self.args.method = HTTP_POST else: self.args.method = HTTP_GET # FIXME: False positive, e.g., "localhost" matches but is a valid URL. elif not re.match('^[a-zA-Z]+$', self.args.method): # Invoked as `http URL item+'. The URL is now in `args.method` # and the first ITEM is now incorrectly in `args.url`. try: # Parse the URL as an ITEM and store it as the first ITEM arg. self.args.items.insert( 0, KeyValueArgType(*SEP_GROUP_ITEMS).__call__(self.args.url) ) except ArgumentTypeError as e: if self.args.traceback: raise self.error(e.message) else: # Set the URL correctly self.args.url = self.args.method # Infer the method has_data = not self.env.stdin_isatty or any( item.sep in SEP_GROUP_DATA_ITEMS for item in self.args.items ) self.args.method = HTTP_POST if has_data else HTTP_GET def _parse_items(self): """Parse `args.items` into `args.headers`, `args.data`, `args.params`, and `args.files`. """ self.args.headers = CaseInsensitiveDict() self.args.data = ParamDict() if self.args.form else OrderedDict() self.args.files = OrderedDict() self.args.params = ParamDict() try: parse_items(items=self.args.items, headers=self.args.headers, data=self.args.data, files=self.args.files, params=self.args.params) except ParseError as e: if self.args.traceback: raise self.error(e.message) if self.args.files and not self.args.form: # `http url @/path/to/file` file_fields = list(self.args.files.keys()) if file_fields != ['']: self.error( 'Invalid file fields (perhaps you meant --form?): %s' % ','.join(file_fields)) fn, fd = self.args.files[''] self.args.files = {} self._body_from_file(fd) if 'Content-Type' not in self.args.headers: mime, encoding = mimetypes.guess_type(fn, strict=False) if mime: content_type = mime if encoding: content_type = '%s; charset=%s' % (mime, encoding) self.args.headers['Content-Type'] = content_type def _process_output_options(self): """Apply defaults to output options, or validate the provided ones. The default output options are stdout-type-sensitive. """ if not self.args.output_options: self.args.output_options = ( OUTPUT_OPTIONS_DEFAULT if self.env.stdout_isatty else OUTPUT_OPTIONS_DEFAULT_STDOUT_REDIRECTED ) unknown_output_options = set(self.args.output_options) - OUTPUT_OPTIONS if unknown_output_options: self.error( 'Unknown output options: %s' % ','.join(unknown_output_options) ) if self.args.download and OUT_RESP_BODY in self.args.output_options: # Response body is always downloaded with --download and it goes # through a different routine, so we remove it. self.args.output_options = str( set(self.args.output_options) - set(OUT_RESP_BODY)) def _process_pretty_options(self): if self.args.prettify == PRETTY_STDOUT_TTY_ONLY: self.args.prettify = PRETTY_MAP[ 'all' if self.env.stdout_isatty else 'none'] elif self.args.prettify and self.env.is_windows: self.error('Only terminal output can be colorized on Windows.') else: # noinspection PyTypeChecker self.args.prettify = PRETTY_MAP[self.args.prettify] def _validate_download_options(self): if not self.args.download: if self.args.download_resume: self.error('--continue only works with --download') if self.args.download_resume and not ( self.args.download and self.args.output_file): self.error('--continue requires --output to be specified') class ParseError(Exception): pass class KeyValue(object): """Base key-value pair parsed from CLI.""" def __init__(self, key, value, sep, orig): self.key = key self.value = value self.sep = sep self.orig = orig def __eq__(self, other): return self.__dict__ == other.__dict__ def session_name_arg_type(name): from .sessions import Session if not Session.is_valid_name(name): raise ArgumentTypeError( 'special characters and spaces are not' ' allowed in session names: "%s"' % name) return name class RegexValidator(object): def __init__(self, pattern, error_message): self.pattern = re.compile(pattern) self.error_message = error_message def __call__(self, value): if not self.pattern.search(value): raise ArgumentError(None, self.error_message) return value class KeyValueArgType(object): """A key-value pair argument type used with `argparse`. Parses a key-value arg and constructs a `KeyValue` instance. Used for headers, form data, and other key-value pair types. """ key_value_class = KeyValue def __init__(self, *separators): self.separators = separators def __call__(self, string): """Parse `string` and return `self.key_value_class()` instance. The best of `self.separators` is determined (first found, longest). Back slash escaped characters aren't considered as separators (or parts thereof). Literal back slash characters have to be escaped as well (r'\\'). """ class Escaped(str): """Represents an escaped character.""" def tokenize(s): """Tokenize `s`. There are only two token types - strings and escaped characters: >>> tokenize(r'foo\=bar\\baz') ['foo', Escaped('='), 'bar', Escaped('\\'), 'baz'] """ tokens = [''] esc = False for c in s: if esc: tokens.extend([Escaped(c), '']) esc = False else: if c == '\\': esc = True else: tokens[-1] += c return tokens tokens = tokenize(string) # Sorting by length ensures that the longest one will be # chosen as it will overwrite any shorter ones starting # at the same position in the `found` dictionary. separators = sorted(self.separators, key=len) for i, token in enumerate(tokens): if isinstance(token, Escaped): continue found = {} for sep in separators: pos = token.find(sep) if pos != -1: found[pos] = sep if found: # Starting first, longest separator found. sep = found[min(found.keys())] key, value = token.split(sep, 1) # Any preceding tokens are part of the key. key = ''.join(tokens[:i]) + key # Any following tokens are part of the value. value += ''.join(tokens[i + 1:]) break else: raise ArgumentTypeError( '"%s" is not a valid value' % string) return self.key_value_class( key=key, value=value, sep=sep, orig=string) class AuthCredentials(KeyValue): """Represents parsed credentials.""" def _getpass(self, prompt): # To allow mocking. return getpass.getpass(prompt) def has_password(self): return self.value is not None def prompt_password(self, host): try: self.value = self._getpass( 'http: password for %s@%s: ' % (self.key, host)) except (EOFError, KeyboardInterrupt): sys.stderr.write('\n') sys.exit(0) class AuthCredentialsArgType(KeyValueArgType): """A key-value arg type that parses credentials.""" key_value_class = AuthCredentials def __call__(self, string): """Parse credentials from `string`. ("username" or "username:password"). """ try: return super(AuthCredentialsArgType, self).__call__(string) except ArgumentTypeError: # No password provided, will prompt for it later. return self.key_value_class( key=string, value=None, sep=SEP_CREDENTIALS, orig=string ) class ParamDict(OrderedDict): """Multi-value dict for URL parameters and form data.""" #noinspection PyMethodOverriding def __setitem__(self, key, value): """ If `key` is assigned more than once, `self[key]` holds a `list` of all the values. This allows having multiple fields with the same name in form data and URL params. """ if key not in self: super(ParamDict, self).__setitem__(key, value) else: if not isinstance(self[key], list): super(ParamDict, self).__setitem__(key, [self[key]]) self[key].append(value) def parse_items(items, data=None, headers=None, files=None, params=None): """Parse `KeyValue` `items` into `data`, `headers`, `files`, and `params`. """ if headers is None: headers = CaseInsensitiveDict() if data is None: data = OrderedDict() if files is None: files = OrderedDict() if params is None: params = ParamDict() for item in items: value = item.value key = item.key if item.sep == SEP_HEADERS: target = headers elif item.sep == SEP_QUERY: target = params elif item.sep == SEP_FILES: try: with open(os.path.expanduser(value), 'rb') as f: value = (os.path.basename(value), BytesIO(f.read())) except IOError as e: raise ParseError( 'Invalid argument "%s": %s' % (item.orig, e)) target = files elif item.sep in [SEP_DATA, SEP_DATA_RAW_JSON]: if item.sep == SEP_DATA_RAW_JSON: try: value = json.loads(item.value) except ValueError: raise ParseError('"%s" is not valid JSON' % item.orig) target = data else: raise TypeError(item) target[key] = value return headers, data, files, params