77 lines
2.6 KiB
Python
77 lines
2.6 KiB
Python
import enum
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from dataclasses import dataclass
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from typing import Optional
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from app import config
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class UnsubscribeAction(enum.Enum):
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UnsubscribeNewsletter = 1
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DisableAlias = 2
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DisableContact = 3
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@dataclass
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class UnsubscribeData:
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action: UnsubscribeAction
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data: int
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@dataclass
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class UnsubscribeLink:
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link: str
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via_email: bool
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class UnsubscribeEncoder:
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@staticmethod
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def encode(action: UnsubscribeAction, data: int) -> UnsubscribeLink:
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if config.UNSUBSCRIBER:
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return UnsubscribeLink(UnsubscribeEncoder.encode_mailto(action, data), True)
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return UnsubscribeLink(UnsubscribeEncoder.encode_url(action, data), False)
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@staticmethod
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def encode_subject(action: UnsubscribeAction, data: int) -> str:
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if action == UnsubscribeAction.DisableAlias:
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return f"{data}="
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if action == UnsubscribeAction.DisableContact:
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return f"{data}_"
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if action == UnsubscribeAction.UnsubscribeNewsletter:
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return f"{data}*"
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@staticmethod
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def encode_mailto(action: UnsubscribeAction, data: int) -> str:
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subject = UnsubscribeEncoder.encode_subject(action, data)
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return f"mailto:{config.UNSUBSCRIBER}?subject={subject}"
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@staticmethod
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def encode_url(action: UnsubscribeAction, data: int) -> str:
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if action == UnsubscribeAction.DisableAlias:
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return f"{config.URL}/dashboard/unsubscribe/{data}"
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if action == UnsubscribeAction.DisableContact:
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return f"{config.URL}/dashboard/block_contact/{data}"
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if action == UnsubscribeAction.UnsubscribeNewsletter:
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raise Exception("Cannot encode url to disable newsletter")
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@staticmethod
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def decode_subject(data: str) -> Optional[UnsubscribeData]:
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try:
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# subject has the format {alias.id}=
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if data.endswith("="):
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alias_id = int(data[:-1])
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return UnsubscribeData(UnsubscribeAction.DisableAlias, alias_id)
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# {contact.id}_
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elif data.endswith("_"):
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contact_id = int(data[:-1])
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return UnsubscribeData(UnsubscribeAction.DisableContact, contact_id)
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# {user.id}*
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elif data.endswith("*"):
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user_id = int(data[:-1])
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return UnsubscribeData(UnsubscribeAction.UnsubscribeNewsletter, user_id)
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else:
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# some email providers might strip off the = suffix
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alias_id = int(data)
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return UnsubscribeData(UnsubscribeAction.DisableAlias, alias_id)
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except ValueError:
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return None
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