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104 lines
4.1 KiB
Python
104 lines
4.1 KiB
Python
import re
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from django.conf import settings
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from django.utils.text import slugify
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from zerver.models import Stream
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from typing import Any, Callable, Dict, Tuple
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def default_option_handler_factory(address_option: str) -> Callable[[Dict[str, Any]], None]:
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def option_setter(options_dict: Dict[str, Any]) -> None:
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options_dict[address_option.replace('-', '_')] = True
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return option_setter
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optional_address_tokens = {
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"show-sender": default_option_handler_factory("show-sender"),
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"include-footer": default_option_handler_factory("include-footer"),
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"include-quotes": default_option_handler_factory("include-quotes"),
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"prefer-text": lambda options: options.update(prefer_text=True),
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"prefer-html": lambda options: options.update(prefer_text=False),
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}
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class ZulipEmailForwardError(Exception):
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pass
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def get_email_gateway_message_string_from_address(address: str) -> str:
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pattern_parts = [re.escape(part) for part in settings.EMAIL_GATEWAY_PATTERN.split('%s')]
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if settings.EMAIL_GATEWAY_EXTRA_PATTERN_HACK:
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# Accept mails delivered to any Zulip server
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pattern_parts[-1] = settings.EMAIL_GATEWAY_EXTRA_PATTERN_HACK
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match_email_re = re.compile("(.*?)".join(pattern_parts))
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match = match_email_re.match(address)
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if not match:
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raise ZulipEmailForwardError('Address not recognized by gateway.')
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msg_string = match.group(1)
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return msg_string
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def encode_email_address(stream: Stream, show_sender: bool=False) -> str:
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return encode_email_address_helper(stream.name, stream.email_token, show_sender)
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def encode_email_address_helper(name: str, email_token: str, show_sender: bool=False) -> str:
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# Some deployments may not use the email gateway
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if settings.EMAIL_GATEWAY_PATTERN == '':
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return ''
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# Given the fact that we have almost no restrictions on stream names and
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# that what characters are allowed in e-mail addresses is complicated and
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# dependent on context in the address, we opt for a simple scheme:
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# 1. Replace all substrings of non-alphanumeric characters with a single hyphen.
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# 2. Use Django's slugify to convert the resulting name to ascii.
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# 3. If the resulting name is shorter than the name we got in step 1,
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# it means some letters can't be reasonably turned to ascii and have to be dropped,
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# which would mangle the name, so we just skip the name part of the address.
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name = re.sub(r"\W+", '-', name)
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slug_name = slugify(name)
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encoded_name = slug_name if len(slug_name) == len(name) else ''
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# If encoded_name ends up empty, we just skip this part of the address:
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if encoded_name:
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encoded_token = f"{encoded_name}.{email_token}"
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else:
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encoded_token = email_token
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if show_sender:
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encoded_token += ".show-sender"
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return settings.EMAIL_GATEWAY_PATTERN % (encoded_token,)
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def decode_email_address(email: str) -> Tuple[str, Dict[str, bool]]:
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# Perform the reverse of encode_email_address. Returns a tuple of
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# (email_token, options)
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msg_string = get_email_gateway_message_string_from_address(email)
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# Support both + and . as separators. For background, the `+` is
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# more aesthetically pleasing, but because Google groups silently
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# drops the use of `+` in email addresses, which would completely
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# break the integration, we now favor `.` as the separator between
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# tokens in the email addresses we generate.
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#
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# We need to keep supporting `+` indefinitely for backwards
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# compatibility with older versions of Zulip that offered users
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# email addresses prioritizing using `+` for better aesthetics.
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msg_string = msg_string.replace('.', '+')
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parts = msg_string.split('+')
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options: Dict[str, bool] = {}
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for part in parts:
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if part in optional_address_tokens:
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optional_address_tokens[part](options)
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remaining_parts = [part for part in parts if part not in optional_address_tokens]
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# There should be one or two parts left:
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# [stream_name, email_token] or just [email_token]
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if len(remaining_parts) == 1:
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token = remaining_parts[0]
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else:
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token = remaining_parts[1]
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return token, options
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