forked from extern/httpie-cli
628 lines
20 KiB
Python
628 lines
20 KiB
Python
"""Parsing and processing of CLI input (args, auth credentials, files, stdin).
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"""
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import os
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import sys
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import re
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import json
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import mimetypes
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import getpass
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from io import BytesIO
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#noinspection PyCompatibility
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from argparse import ArgumentParser, ArgumentTypeError, ArgumentError
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# TODO: Use MultiDict for headers once added to `requests`.
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# https://github.com/jakubroztocil/httpie/issues/130
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from requests.structures import CaseInsensitiveDict
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from httpie.compat import OrderedDict, urlsplit, str
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from httpie.sessions import VALID_SESSION_NAME_PATTERN
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HTTP_POST = 'POST'
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HTTP_GET = 'GET'
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HTTP = 'http://'
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HTTPS = 'https://'
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# Various separators used in args
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SEP_HEADERS = ':'
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SEP_CREDENTIALS = ':'
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SEP_PROXY = ':'
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SEP_DATA = '='
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SEP_DATA_RAW_JSON = ':='
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SEP_FILES = '@'
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SEP_DATA_EMBED_FILE = '=@'
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SEP_DATA_EMBED_RAW_JSON_FILE = ':=@'
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SEP_QUERY = '=='
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# Separators that become request data
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SEP_GROUP_DATA_ITEMS = frozenset([
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SEP_DATA,
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SEP_DATA_RAW_JSON,
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SEP_FILES,
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SEP_DATA_EMBED_FILE,
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SEP_DATA_EMBED_RAW_JSON_FILE
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])
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# Separators for items whose value is a filename to be embedded
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SEP_GROUP_DATA_EMBED_ITEMS = frozenset([
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SEP_DATA_EMBED_FILE,
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SEP_DATA_EMBED_RAW_JSON_FILE,
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])
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# Separators for raw JSON items
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SEP_GROUP_RAW_JSON_ITEMS = frozenset([
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SEP_DATA_RAW_JSON,
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SEP_DATA_EMBED_RAW_JSON_FILE,
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])
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# Separators allowed in ITEM arguments
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SEP_GROUP_ALL_ITEMS = frozenset([
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SEP_HEADERS,
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SEP_QUERY,
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SEP_DATA,
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SEP_DATA_RAW_JSON,
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SEP_FILES,
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SEP_DATA_EMBED_FILE,
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SEP_DATA_EMBED_RAW_JSON_FILE,
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])
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# Output options
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OUT_REQ_HEAD = 'H'
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OUT_REQ_BODY = 'B'
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OUT_RESP_HEAD = 'h'
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OUT_RESP_BODY = 'b'
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OUTPUT_OPTIONS = frozenset([
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OUT_REQ_HEAD,
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OUT_REQ_BODY,
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OUT_RESP_HEAD,
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OUT_RESP_BODY
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])
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# Pretty
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PRETTY_MAP = {
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'all': ['format', 'colors'],
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'colors': ['colors'],
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'format': ['format'],
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'none': []
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}
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PRETTY_STDOUT_TTY_ONLY = object()
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# Defaults
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OUTPUT_OPTIONS_DEFAULT = OUT_RESP_HEAD + OUT_RESP_BODY
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OUTPUT_OPTIONS_DEFAULT_STDOUT_REDIRECTED = OUT_RESP_BODY
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class Parser(ArgumentParser):
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"""Adds additional logic to `argparse.ArgumentParser`.
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Handles all input (CLI args, file args, stdin), applies defaults,
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and performs extra validation.
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"""
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def __init__(self, *args, **kwargs):
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kwargs['add_help'] = False
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super(Parser, self).__init__(*args, **kwargs)
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#noinspection PyMethodOverriding
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def parse_args(self, env, args=None, namespace=None):
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self.env = env
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self.args, no_options = super(Parser, self)\
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.parse_known_args(args, namespace)
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if self.args.debug:
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self.args.traceback = True
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# Arguments processing and environment setup.
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self._apply_no_options(no_options)
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self._apply_config()
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self._validate_download_options()
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self._setup_standard_streams()
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self._process_output_options()
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self._process_pretty_options()
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self._guess_method()
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self._parse_items()
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if not self.args.ignore_stdin and not env.stdin_isatty:
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self._body_from_file(self.env.stdin)
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if not (self.args.url.startswith((HTTP, HTTPS))):
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scheme = HTTP
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# See if we're using curl style shorthand for localhost (:3000/foo)
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shorthand = re.match(r'^:(?!:)(\d*)(/?.*)$', self.args.url)
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if shorthand:
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port = shorthand.group(1)
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rest = shorthand.group(2)
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self.args.url = scheme + 'localhost'
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if port:
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self.args.url += ':' + port
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self.args.url += rest
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else:
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self.args.url = scheme + self.args.url
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self._process_auth()
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return self.args
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# noinspection PyShadowingBuiltins
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def _print_message(self, message, file=None):
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# Sneak in our stderr/stdout.
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file = {
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sys.stdout: self.env.stdout,
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sys.stderr: self.env.stderr,
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None: self.env.stderr
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}.get(file, file)
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if not hasattr(file, 'buffer') and isinstance(message, str):
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message = message.encode(self.env.stdout_encoding)
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super(Parser, self)._print_message(message, file)
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def _setup_standard_streams(self):
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"""
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Modify `env.stdout` and `env.stdout_isatty` based on args, if needed.
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"""
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if not self.env.stdout_isatty and self.args.output_file:
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self.error('Cannot use --output, -o with redirected output.')
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if self.args.download:
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# FIXME: Come up with a cleaner solution.
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if not self.env.stdout_isatty:
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# Use stdout as the download output file.
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self.args.output_file = self.env.stdout
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# With `--download`, we write everything that would normally go to
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# `stdout` to `stderr` instead. Let's replace the stream so that
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# we don't have to use many `if`s throughout the codebase.
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# The response body will be treated separately.
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self.env.stdout = self.env.stderr
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self.env.stdout_isatty = self.env.stderr_isatty
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elif self.args.output_file:
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# When not `--download`ing, then `--output` simply replaces
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# `stdout`. The file is opened for appending, which isn't what
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# we want in this case.
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self.args.output_file.seek(0)
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self.args.output_file.truncate()
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self.env.stdout = self.args.output_file
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self.env.stdout_isatty = False
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def _apply_config(self):
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if (not self.args.json
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and self.env.config.implicit_content_type == 'form'):
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self.args.form = True
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def _process_auth(self):
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"""
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If only a username provided via --auth, then ask for a password.
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Or, take credentials from the URL, if provided.
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"""
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url = urlsplit(self.args.url)
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if self.args.auth:
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if not self.args.auth.has_password():
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# Stdin already read (if not a tty) so it's save to prompt.
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if self.args.ignore_stdin:
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self.error('Unable to prompt for passwords because'
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' --ignore-stdin is set.')
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self.args.auth.prompt_password(url.netloc)
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elif url.username is not None:
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# Handle http://username:password@hostname/
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username, password = url.username, url.password
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self.args.auth = AuthCredentials(
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key=username,
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value=password,
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sep=SEP_CREDENTIALS,
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orig=SEP_CREDENTIALS.join([username, password])
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)
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def _apply_no_options(self, no_options):
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"""For every `--no-OPTION` in `no_options`, set `args.OPTION` to
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its default value. This allows for un-setting of options, e.g.,
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specified in config.
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"""
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invalid = []
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for option in no_options:
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if not option.startswith('--no-'):
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invalid.append(option)
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continue
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# --no-option => --option
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inverted = '--' + option[5:]
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for action in self._actions:
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if inverted in action.option_strings:
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setattr(self.args, action.dest, action.default)
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break
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else:
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invalid.append(option)
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if invalid:
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msg = 'unrecognized arguments: %s'
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self.error(msg % ' '.join(invalid))
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def _body_from_file(self, fd):
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"""There can only be one source of request data.
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Bytes are always read.
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"""
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if self.args.data:
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self.error('Request body (from stdin or a file) and request '
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'data (key=value) cannot be mixed.')
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self.args.data = getattr(fd, 'buffer', fd).read()
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def _guess_method(self):
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"""Set `args.method` if not specified to either POST or GET
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based on whether the request has data or not.
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"""
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if self.args.method is None:
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# Invoked as `http URL'.
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assert not self.args.items
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if not self.args.ignore_stdin and not self.env.stdin_isatty:
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self.args.method = HTTP_POST
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else:
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self.args.method = HTTP_GET
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# FIXME: False positive, e.g., "localhost" matches but is a valid URL.
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elif not re.match('^[a-zA-Z]+$', self.args.method):
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# Invoked as `http URL item+'. The URL is now in `args.method`
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# and the first ITEM is now incorrectly in `args.url`.
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try:
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# Parse the URL as an ITEM and store it as the first ITEM arg.
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self.args.items.insert(0, KeyValueArgType(
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*SEP_GROUP_ALL_ITEMS).__call__(self.args.url))
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except ArgumentTypeError as e:
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if self.args.traceback:
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raise
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self.error(e.args[0])
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else:
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# Set the URL correctly
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self.args.url = self.args.method
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# Infer the method
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has_data = (
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(not self.args.ignore_stdin and not self.env.stdin_isatty)
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or any(item.sep in SEP_GROUP_DATA_ITEMS
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for item in self.args.items)
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)
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self.args.method = HTTP_POST if has_data else HTTP_GET
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def _parse_items(self):
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"""Parse `args.items` into `args.headers`, `args.data`, `args.params`,
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and `args.files`.
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"""
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self.args.headers = CaseInsensitiveDict()
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self.args.data = ParamDict() if self.args.form else OrderedDict()
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self.args.files = OrderedDict()
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self.args.params = ParamDict()
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try:
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parse_items(items=self.args.items,
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headers=self.args.headers,
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data=self.args.data,
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files=self.args.files,
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params=self.args.params)
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except ParseError as e:
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if self.args.traceback:
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raise
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self.error(e.args[0])
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if self.args.files and not self.args.form:
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# `http url @/path/to/file`
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file_fields = list(self.args.files.keys())
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if file_fields != ['']:
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self.error(
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'Invalid file fields (perhaps you meant --form?): %s'
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% ','.join(file_fields))
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fn, fd = self.args.files['']
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self.args.files = {}
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self._body_from_file(fd)
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if 'Content-Type' not in self.args.headers:
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mime, encoding = mimetypes.guess_type(fn, strict=False)
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if mime:
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content_type = mime
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if encoding:
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content_type = '%s; charset=%s' % (mime, encoding)
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self.args.headers['Content-Type'] = content_type
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def _process_output_options(self):
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"""Apply defaults to output options, or validate the provided ones.
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The default output options are stdout-type-sensitive.
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"""
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if not self.args.output_options:
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self.args.output_options = (
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OUTPUT_OPTIONS_DEFAULT
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if self.env.stdout_isatty
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else OUTPUT_OPTIONS_DEFAULT_STDOUT_REDIRECTED
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)
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unknown_output_options = set(self.args.output_options) - OUTPUT_OPTIONS
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if unknown_output_options:
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self.error(
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'Unknown output options: %s' % ','.join(unknown_output_options)
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)
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if self.args.download and OUT_RESP_BODY in self.args.output_options:
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# Response body is always downloaded with --download and it goes
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# through a different routine, so we remove it.
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self.args.output_options = str(
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set(self.args.output_options) - set(OUT_RESP_BODY))
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def _process_pretty_options(self):
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if self.args.prettify == PRETTY_STDOUT_TTY_ONLY:
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self.args.prettify = PRETTY_MAP[
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'all' if self.env.stdout_isatty else 'none']
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elif self.args.prettify and self.env.is_windows:
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self.error('Only terminal output can be colorized on Windows.')
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else:
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# noinspection PyTypeChecker
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self.args.prettify = PRETTY_MAP[self.args.prettify]
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def _validate_download_options(self):
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if not self.args.download:
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if self.args.download_resume:
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self.error('--continue only works with --download')
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if self.args.download_resume and not (
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self.args.download and self.args.output_file):
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self.error('--continue requires --output to be specified')
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class ParseError(Exception):
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pass
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class KeyValue(object):
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"""Base key-value pair parsed from CLI."""
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def __init__(self, key, value, sep, orig):
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self.key = key
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self.value = value
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self.sep = sep
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self.orig = orig
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def __eq__(self, other):
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return self.__dict__ == other.__dict__
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class SessionNameValidator(object):
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def __init__(self, error_message):
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self.error_message = error_message
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def __call__(self, value):
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# Session name can be a path or just a name.
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if (os.path.sep not in value
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and not VALID_SESSION_NAME_PATTERN.search(value)):
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raise ArgumentError(None, self.error_message)
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return value
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class KeyValueArgType(object):
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"""A key-value pair argument type used with `argparse`.
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Parses a key-value arg and constructs a `KeyValue` instance.
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Used for headers, form data, and other key-value pair types.
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"""
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key_value_class = KeyValue
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def __init__(self, *separators):
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self.separators = separators
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def __call__(self, string):
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"""Parse `string` and return `self.key_value_class()` instance.
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The best of `self.separators` is determined (first found, longest).
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Back slash escaped characters aren't considered as separators
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(or parts thereof). Literal back slash characters have to be escaped
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as well (r'\\').
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"""
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class Escaped(str):
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"""Represents an escaped character."""
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def tokenize(s):
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"""Tokenize `s`. There are only two token types - strings
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and escaped characters:
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tokenize(r'foo\=bar\\baz')
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=> ['foo', Escaped('='), 'bar', Escaped('\\'), 'baz']
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"""
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tokens = ['']
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esc = False
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for c in s:
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if esc:
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tokens.extend([Escaped(c), ''])
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esc = False
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else:
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if c == '\\':
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esc = True
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else:
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tokens[-1] += c
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return tokens
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tokens = tokenize(string)
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# Sorting by length ensures that the longest one will be
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# chosen as it will overwrite any shorter ones starting
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# at the same position in the `found` dictionary.
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separators = sorted(self.separators, key=len)
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for i, token in enumerate(tokens):
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if isinstance(token, Escaped):
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continue
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found = {}
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for sep in separators:
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pos = token.find(sep)
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if pos != -1:
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found[pos] = sep
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if found:
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# Starting first, longest separator found.
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sep = found[min(found.keys())]
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key, value = token.split(sep, 1)
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# Any preceding tokens are part of the key.
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key = ''.join(tokens[:i]) + key
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# Any following tokens are part of the value.
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value += ''.join(tokens[i + 1:])
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break
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else:
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raise ArgumentTypeError(
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u'"%s" is not a valid value' % string)
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return self.key_value_class(
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key=key, value=value, sep=sep, orig=string)
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class AuthCredentials(KeyValue):
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"""Represents parsed credentials."""
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def _getpass(self, prompt):
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# To allow mocking.
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return getpass.getpass(prompt)
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def has_password(self):
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return self.value is not None
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def prompt_password(self, host):
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try:
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self.value = self._getpass(
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'http: password for %s@%s: ' % (self.key, host))
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except (EOFError, KeyboardInterrupt):
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sys.stderr.write('\n')
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sys.exit(0)
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class AuthCredentialsArgType(KeyValueArgType):
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"""A key-value arg type that parses credentials."""
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key_value_class = AuthCredentials
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def __call__(self, string):
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"""Parse credentials from `string`.
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("username" or "username:password").
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"""
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try:
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return super(AuthCredentialsArgType, self).__call__(string)
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except ArgumentTypeError:
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# No password provided, will prompt for it later.
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return self.key_value_class(
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key=string,
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value=None,
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sep=SEP_CREDENTIALS,
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orig=string
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)
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class ParamDict(OrderedDict):
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"""Multi-value dict for URL parameters and form data."""
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#noinspection PyMethodOverriding
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def __setitem__(self, key, value):
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""" If `key` is assigned more than once, `self[key]` holds a
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|
`list` of all the values.
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This allows having multiple fields with the same name in form
|
|
data and URL params.
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"""
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if key not in self:
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super(ParamDict, self).__setitem__(key, value)
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else:
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if not isinstance(self[key], list):
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super(ParamDict, self).__setitem__(key, [self[key]])
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self[key].append(value)
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def parse_items(items, data=None, headers=None, files=None, params=None):
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"""Parse `KeyValue` `items` into `data`, `headers`, `files`,
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|
and `params`.
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|
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"""
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if headers is None:
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|
headers = CaseInsensitiveDict()
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|
if data is None:
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data = OrderedDict()
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if files is None:
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files = OrderedDict()
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|
if params is None:
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params = ParamDict()
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|
|
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for item in items:
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|
value = item.value
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|
|
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if item.sep == SEP_HEADERS:
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target = headers
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|
elif item.sep == SEP_QUERY:
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|
target = params
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|
elif item.sep == SEP_FILES:
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|
try:
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|
with open(os.path.expanduser(value), 'rb') as f:
|
|
value = (os.path.basename(value),
|
|
BytesIO(f.read()))
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|
except IOError as e:
|
|
raise ParseError('"%s": %s' % (item.orig, e))
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|
target = files
|
|
|
|
elif item.sep in SEP_GROUP_DATA_ITEMS:
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|
|
|
if item.sep in SEP_GROUP_DATA_EMBED_ITEMS:
|
|
try:
|
|
with open(os.path.expanduser(value), 'rb') as f:
|
|
value = f.read().decode('utf8')
|
|
except IOError as e:
|
|
raise ParseError('"%s": %s' % (item.orig, e))
|
|
except UnicodeDecodeError:
|
|
raise ParseError(
|
|
'"%s": cannot embed the content of "%s",'
|
|
' not a UTF8 or ASCII-encoded text file'
|
|
% (item.orig, item.value)
|
|
)
|
|
|
|
if item.sep in SEP_GROUP_RAW_JSON_ITEMS:
|
|
try:
|
|
value = json.loads(value)
|
|
except ValueError as e:
|
|
raise ParseError('"%s": %s' % (item.orig, e))
|
|
target = data
|
|
|
|
else:
|
|
raise TypeError(item)
|
|
|
|
target[item.key] = value
|
|
|
|
return headers, data, files, params
|
|
|
|
|
|
def readable_file_arg(filename):
|
|
try:
|
|
open(filename, 'rb')
|
|
except IOError as ex:
|
|
raise ArgumentTypeError('%s: %s' % (filename, ex.args[1]))
|
|
return filename
|