paperless-ngx/src/paperless_mail/tests/test_mail.py

import dataclasses
import email.contentmanager
import random
import uuid
from collections import namedtuple
from typing import ContextManager
from typing import List
from typing import Optional
from typing import Union
from unittest import mock

from django.core.management import call_command
from django.db import DatabaseError
from django.test import TestCase
from documents.models import Correspondent
from documents.tests.utils import DirectoriesMixin
from documents.tests.utils import FileSystemAssertsMixin
from imap_tools import EmailAddress
from imap_tools import FolderInfo
from imap_tools import MailboxFolderSelectError
from imap_tools import MailboxLoginError
from imap_tools import MailMessage
from imap_tools import MailMessageFlags
from imap_tools import NOT
from paperless_mail import tasks
from paperless_mail.mail import apply_mail_action
from paperless_mail.mail import MailAccountHandler
from paperless_mail.mail import MailError
from paperless_mail.mail import TagMailAction
from paperless_mail.models import MailAccount
from paperless_mail.models import MailRule


@dataclasses.dataclass
class _AttachmentDef:
    filename: str = "a_file.pdf"
    maintype: str = "application/pdf"
    subtype: str = "pdf"
    disposition: str = "attachment"
    content: bytes = b"a PDF document"


class BogusFolderManager:
    current_folder = "INBOX"

    def set(self, new_folder):
        if new_folder not in ["INBOX", "spam"]:
            raise MailboxFolderSelectError(None, "uhm")
        self.current_folder = new_folder


class BogusClient:
    def __init__(self, messages):
        self.messages: List[MailMessage] = messages
        self.capabilities: List[str] = []

    def __enter__(self):
        return self

    def __exit__(self, exc_type, exc_val, exc_tb):
        pass

    def authenticate(self, mechanism, authobject):
        # authobject must be a callable object
        auth_bytes = authobject(None)
        if auth_bytes != b"\x00admin\x00w57\xc3\xa4\xc3\xb6\xc3\xbcw4b6huwb6nhu":
            raise MailboxLoginError("BAD", "OK")

    def uid(self, command, *args):
        if command == "STORE":
            for message in self.messages:
                if message.uid == args[0]:
                    flag = args[2]
                    if flag == "processed":
                        message._raw_flag_data.append(b"+FLAGS (processed)")
                        MailMessage.flags.fget.cache_clear()


class BogusMailBox(ContextManager):

    # Common values so tests don't need to remember an accepted login
    USERNAME: str = "admin"
    ASCII_PASSWORD: str = "secret"
    # Note the non-ascii characters here
    UTF_PASSWORD: str = "w57äöüw4b6huwb6nhu"

    def __init__(self):
        self.messages: List[MailMessage] = []
        self.messages_spam: List[MailMessage] = []
        self.folder = BogusFolderManager()
        self.client = BogusClient(self.messages)
        self._host = ""

    def __enter__(self):
        return self

    def __exit__(self, exc_type, exc_val, exc_tb):
        pass

    def updateClient(self):
        self.client = BogusClient(self.messages)

    def login(self, username, password):
        # This will raise a UnicodeEncodeError if the password is not ASCII only
        password.encode("ascii")
        # Otherwise, check for correct values
        if username != self.USERNAME or password != self.ASCII_PASSWORD:
            raise MailboxLoginError("BAD", "OK")

    def login_utf8(self, username, password):
        # Expected to only be called with the UTF-8 password
        if username != self.USERNAME or password != self.UTF_PASSWORD:
            raise MailboxLoginError("BAD", "OK")

    def fetch(self, criteria, mark_seen, charset=""):
        msg = self.messages

        criteria = str(criteria).strip("()").split(" ")

        if "UNSEEN" in criteria:
            msg = filter(lambda m: not m.seen, msg)

        if "SUBJECT" in criteria:
            subject = criteria[criteria.index("SUBJECT") + 1].strip('"')
            msg = filter(lambda m: subject in m.subject, msg)

        if "BODY" in criteria:
            body = criteria[criteria.index("BODY") + 1].strip('"')
            msg = filter(lambda m: body in m.text, msg)

        if "FROM" in criteria:
            from_ = criteria[criteria.index("FROM") + 1].strip('"')
            msg = filter(lambda m: from_ in m.from_, msg)

        if "TO" in criteria:
            to_ = criteria[criteria.index("TO") + 1].strip('"')
            msg = []
            for m in self.messages:
                for to_addrs in m.to:
                    if to_ in to_addrs:
                        msg.append(m)

        if "UNFLAGGED" in criteria:
            msg = filter(lambda m: not m.flagged, msg)

        if "UNKEYWORD" in criteria:
            tag = criteria[criteria.index("UNKEYWORD") + 1].strip("'")
            msg = filter(lambda m: tag not in m.flags, msg)

        if "(X-GM-LABELS" in criteria:  # ['NOT', '(X-GM-LABELS', '"processed"']
            msg = filter(lambda m: "processed" not in m.flags, msg)

        return list(msg)

    def delete(self, uid_list):
        self.messages = list(filter(lambda m: m.uid not in uid_list, self.messages))

    def flag(self, uid_list, flag_set, value):
        for message in self.messages:
            if message.uid in uid_list:
                for flag in flag_set:
                    if flag == MailMessageFlags.FLAGGED:
                        message.flagged = value
                    if flag == MailMessageFlags.SEEN:
                        message.seen = value
                    if flag == "processed":
                        message._raw_flag_data.append(b"+FLAGS (processed)")
                        MailMessage.flags.fget.cache_clear()

    def move(self, uid_list, folder):
        if folder == "spam":
            self.messages_spam += list(
                filter(lambda m: m.uid in uid_list, self.messages),
            )
            self.messages = list(filter(lambda m: m.uid not in uid_list, self.messages))
        else:
            raise Exception()


def fake_magic_from_buffer(buffer, mime=False):
    if mime:
        if "PDF" in str(buffer):
            return "application/pdf"
        else:
            return "unknown/type"
    else:
        return "Some verbose file description"


@mock.patch("paperless_mail.mail.magic.from_buffer", fake_magic_from_buffer)
class TestMail(DirectoriesMixin, FileSystemAssertsMixin, TestCase):
    def setUp(self):
        self._used_uids = set()

        self.bogus_mailbox = BogusMailBox()

        patcher = mock.patch("paperless_mail.mail.MailBox")
        m = patcher.start()
        m.return_value = self.bogus_mailbox
        self.addCleanup(patcher.stop)

        patcher = mock.patch("paperless_mail.mail.queue_consumption_tasks")
        self._queue_consumption_tasks_mock = patcher.start()
        self.addCleanup(patcher.stop)

        self.reset_bogus_mailbox()

        self.mail_account_handler = MailAccountHandler()
        super().setUp()

    def create_message(
        self,
        attachments: Union[int, List[_AttachmentDef]] = 1,
        body: str = "",
        subject: str = "the suject",
        from_: str = "noone@mail.com",
        to: Optional[List[str]] = None,
        seen: bool = False,
        flagged: bool = False,
        processed: bool = False,
    ) -> MailMessage:

        if to is None:
            to = ["tosomeone@somewhere.com"]

        email_msg = email.message.EmailMessage()
        # TODO: This does NOT set the UID
        email_msg["Message-ID"] = str(uuid.uuid4())
        email_msg["Subject"] = subject
        email_msg["From"] = from_
        email_msg["To"] = str(" ,".join(to))
        email_msg.set_content(body)

        # Either add some default number of attachments
        # or the provided attachments
        if isinstance(attachments, int):
            for i in range(attachments):
                attachment = _AttachmentDef(filename=f"file_{i}.pdf")
                email_msg.add_attachment(
                    attachment.content,
                    maintype=attachment.maintype,
                    subtype=attachment.subtype,
                    disposition=attachment.disposition,
                    filename=attachment.filename,
                )
        else:
            for attachment in attachments:
                email_msg.add_attachment(
                    attachment.content,
                    maintype=attachment.maintype,
                    subtype=attachment.subtype,
                    disposition=attachment.disposition,
                    filename=attachment.filename,
                )

        # Convert the EmailMessage to an imap_tools MailMessage
        imap_msg = MailMessage.from_bytes(email_msg.as_bytes())

        # TODO: Unsure how to add a uid to the actual EmailMessage. This hacks it in,
        #  based on how imap_tools uses regex to extract it.
        #  This should be a large enough pool
        uid = random.randint(1, 10000)
        while uid in self._used_uids:
            uid = random.randint(1, 10000)
        self._used_uids.add(uid)

        imap_msg._raw_uid_data = f"UID {uid}".encode()

        imap_msg.seen = seen
        imap_msg.flagged = flagged
        if processed:
            imap_msg._raw_flag_data.append(b"+FLAGS (processed)")
            MailMessage.flags.fget.cache_clear()

        return imap_msg

    def reset_bogus_mailbox(self):
        self.bogus_mailbox.messages = []
        self.bogus_mailbox.messages_spam = []
        self.bogus_mailbox.messages.append(
            self.create_message(
                subject="Invoice 1",
                from_="amazon@amazon.de",
                to=["me@myselfandi.com", "helpdesk@mydomain.com"],
                body="cables",
                seen=True,
                flagged=False,
                processed=False,
            ),
        )
        self.bogus_mailbox.messages.append(
            self.create_message(
                subject="Invoice 2",
                body="from my favorite electronic store",
                to=["invoices@mycompany.com"],
                seen=False,
                flagged=True,
                processed=True,
            ),
        )
        self.bogus_mailbox.messages.append(
            self.create_message(
                subject="Claim your $10M price now!",
                from_="amazon@amazon-some-indian-site.org",
                to="special@me.me",
                seen=False,
            ),
        )
        self.bogus_mailbox.updateClient()

    def test_get_correspondent(self):
        message = namedtuple("MailMessage", [])
        message.from_ = "someone@somewhere.com"
        message.from_values = EmailAddress(
            "Someone!",
            "someone@somewhere.com",
        )

        message2 = namedtuple("MailMessage", [])
        message2.from_ = "me@localhost.com"
        message2.from_values = EmailAddress(
            "",
            "fake@localhost.com",
        )

        me_localhost = Correspondent.objects.create(name=message2.from_)
        someone_else = Correspondent.objects.create(name="someone else")

        handler = MailAccountHandler()

        rule = MailRule(
            name="a",
            assign_correspondent_from=MailRule.CorrespondentSource.FROM_NOTHING,
        )
        self.assertIsNone(handler._get_correspondent(message, rule))

        rule = MailRule(
            name="b",
            assign_correspondent_from=MailRule.CorrespondentSource.FROM_EMAIL,
        )
        c = handler._get_correspondent(message, rule)
        self.assertIsNotNone(c)
        self.assertEqual(c.name, "someone@somewhere.com")
        c = handler._get_correspondent(message2, rule)
        self.assertIsNotNone(c)
        self.assertEqual(c.name, "me@localhost.com")
        self.assertEqual(c.id, me_localhost.id)

        rule = MailRule(
            name="c",
            assign_correspondent_from=MailRule.CorrespondentSource.FROM_NAME,
        )
        c = handler._get_correspondent(message, rule)
        self.assertIsNotNone(c)
        self.assertEqual(c.name, "Someone!")
        c = handler._get_correspondent(message2, rule)
        self.assertIsNotNone(c)
        self.assertEqual(c.id, me_localhost.id)

        rule = MailRule(
            name="d",
            assign_correspondent_from=MailRule.CorrespondentSource.FROM_CUSTOM,
            assign_correspondent=someone_else,
        )
        c = handler._get_correspondent(message, rule)
        self.assertEqual(c, someone_else)

    def test_get_title(self):
        message = namedtuple("MailMessage", [])
        message.subject = "the message title"
        att = namedtuple("Attachment", [])
        att.filename = "this_is_the_file.pdf"

        handler = MailAccountHandler()

        rule = MailRule(
            name="a",
            assign_title_from=MailRule.TitleSource.FROM_FILENAME,
        )
        self.assertEqual(handler._get_title(message, att, rule), "this_is_the_file")
        rule = MailRule(
            name="b",
            assign_title_from=MailRule.TitleSource.FROM_SUBJECT,
        )
        self.assertEqual(handler._get_title(message, att, rule), "the message title")

    def test_handle_message(self):
        message = self.create_message(
            subject="the message title",
            from_="Myself",
            attachments=2,
        )

        account = MailAccount()
        account.save()
        rule = MailRule(
            assign_title_from=MailRule.TitleSource.FROM_FILENAME,
            account=account,
        )
        rule.save()

        result = self.mail_account_handler._handle_message(message, rule)

        self.assertEqual(result, 2)

        self.assert_queue_consumption_tasks_call_args(
            [
                [
                    {"override_title": "file_0", "override_filename": "file_0.pdf"},
                    {"override_title": "file_1", "override_filename": "file_1.pdf"},
                ],
            ],
        )

    def test_handle_empty_message(self):
        message = namedtuple("MailMessage", [])

        message.attachments = []
        rule = MailRule()

        result = self.mail_account_handler._handle_message(message, rule)

        self.assertFalse(self._queue_consumption_tasks_mock.called)
        self.assertEqual(result, 0)

    def test_handle_unknown_mime_type(self):
        message = self.create_message(
            attachments=[
                _AttachmentDef(filename="f1.pdf"),
                _AttachmentDef(
                    filename="f2.json",
                    content=b"{'much': 'payload.', 'so': 'json', 'wow': true}",
                ),
            ],
        )

        account = MailAccount()
        account.save()
        rule = MailRule(
            assign_title_from=MailRule.TitleSource.FROM_FILENAME,
            account=account,
        )
        rule.save()

        result = self.mail_account_handler._handle_message(message, rule)

        self.assertEqual(result, 1)
        self.assert_queue_consumption_tasks_call_args(
            [
                [
                    {"override_filename": "f1.pdf"},
                ],
            ],
        )

    def test_handle_disposition(self):
        message = self.create_message(
            attachments=[
                _AttachmentDef(
                    filename="f1.pdf",
                    disposition="inline",
                ),
                _AttachmentDef(filename="f2.pdf"),
            ],
        )

        account = MailAccount()
        account.save()
        rule = MailRule(
            assign_title_from=MailRule.TitleSource.FROM_FILENAME,
            account=account,
        )
        rule.save()

        result = self.mail_account_handler._handle_message(message, rule)
        self.assertEqual(result, 1)
        self.assert_queue_consumption_tasks_call_args(
            [
                [
                    {"override_filename": "f2.pdf"},
                ],
            ],
        )

    def test_handle_inline_files(self):
        message = self.create_message(
            attachments=[
                _AttachmentDef(
                    filename="f1.pdf",
                    disposition="inline",
                ),
                _AttachmentDef(filename="f2.pdf"),
            ],
        )

        account = MailAccount()
        account.save()
        rule = MailRule(
            assign_title_from=MailRule.TitleSource.FROM_FILENAME,
            account=account,
            attachment_type=MailRule.AttachmentProcessing.EVERYTHING,
        )
        rule.save()

        result = self.mail_account_handler._handle_message(message, rule)
        self.assertEqual(result, 2)
        self.assert_queue_consumption_tasks_call_args(
            [
                [
                    {"override_filename": "f1.pdf"},
                    {"override_filename": "f2.pdf"},
                ],
            ],
        )

    def test_filename_filter(self):
        message = self.create_message(
            attachments=[
                _AttachmentDef(filename="f1.pdf"),
                _AttachmentDef(filename="f2.pdf"),
                _AttachmentDef(filename="f3.pdf"),
                _AttachmentDef(filename="f2.png"),
                _AttachmentDef(filename="file.PDf"),
                _AttachmentDef(filename="f1.Pdf"),
            ],
        )

        tests = [
            ("*.pdf", ["f1.pdf", "f2.pdf", "f3.pdf", "file.PDf", "f1.Pdf"]),
            ("f1.pdf", ["f1.pdf", "f1.Pdf"]),
            ("f1", []),
            ("*", ["f1.pdf", "f2.pdf", "f3.pdf", "f2.png", "file.PDf", "f1.Pdf"]),
            ("*.png", ["f2.png"]),
        ]

        for (pattern, matches) in tests:
            with self.subTest(msg=pattern):
                print(f"PATTERN {pattern}")
                self._queue_consumption_tasks_mock.reset_mock()
                account = MailAccount(name=str(uuid.uuid4()))
                account.save()
                rule = MailRule(
                    name=str(uuid.uuid4()),
                    assign_title_from=MailRule.TitleSource.FROM_FILENAME,
                    account=account,
                    filter_attachment_filename=pattern,
                )
                rule.save()

                self.mail_account_handler._handle_message(message, rule)
                self.assert_queue_consumption_tasks_call_args(
                    [
                        [{"override_filename": m} for m in matches],
                    ],
                )

    def test_handle_mail_account_mark_read(self):

        account = MailAccount.objects.create(
            name="test",
            imap_server="",
            username="admin",
            password="secret",
        )

        _ = MailRule.objects.create(
            name="testrule",
            account=account,
            action=MailRule.MailAction.MARK_READ,
        )

        self.assertEqual(len(self.bogus_mailbox.messages), 3)
        self.assertEqual(len(self.bogus_mailbox.fetch("UNSEEN", False)), 2)

        self.mail_account_handler.handle_mail_account(account)
        self.apply_mail_actions()

        self.assertEqual(len(self.bogus_mailbox.fetch("UNSEEN", False)), 0)
        self.assertEqual(len(self.bogus_mailbox.messages), 3)

    def test_handle_mail_account_delete(self):

        account = MailAccount.objects.create(
            name="test",
            imap_server="",
            username="admin",
            password="secret",
        )

        _ = MailRule.objects.create(
            name="testrule",
            account=account,
            action=MailRule.MailAction.DELETE,
            filter_subject="Invoice",
        )

        self.assertEqual(len(self.bogus_mailbox.messages), 3)

        self.mail_account_handler.handle_mail_account(account)
        self.apply_mail_actions()

        self.assertEqual(len(self.bogus_mailbox.messages), 1)

    def test_handle_mail_account_flag(self):
        account = MailAccount.objects.create(
            name="test",
            imap_server="",
            username="admin",
            password="secret",
        )

        _ = MailRule.objects.create(
            name="testrule",
            account=account,
            action=MailRule.MailAction.FLAG,
            filter_subject="Invoice",
        )

        self.assertEqual(len(self.bogus_mailbox.messages), 3)
        self.assertEqual(len(self.bogus_mailbox.fetch("UNFLAGGED", False)), 2)

        self.mail_account_handler.handle_mail_account(account)
        self.apply_mail_actions()

        self.assertEqual(len(self.bogus_mailbox.fetch("UNFLAGGED", False)), 1)
        self.assertEqual(len(self.bogus_mailbox.messages), 3)

    def test_handle_mail_account_move(self):
        account = MailAccount.objects.create(
            name="test",
            imap_server="",
            username="admin",
            password="secret",
        )

        _ = MailRule.objects.create(
            name="testrule",
            account=account,
            action=MailRule.MailAction.MOVE,
            action_parameter="spam",
            filter_subject="Claim",
        )

        self.assertEqual(len(self.bogus_mailbox.messages), 3)
        self.assertEqual(len(self.bogus_mailbox.messages_spam), 0)

        self.mail_account_handler.handle_mail_account(account)
        self.apply_mail_actions()

        self.assertEqual(len(self.bogus_mailbox.messages), 2)
        self.assertEqual(len(self.bogus_mailbox.messages_spam), 1)

    def test_handle_mail_account_tag(self):
        account = MailAccount.objects.create(
            name="test",
            imap_server="",
            username="admin",
            password="secret",
        )

        _ = MailRule.objects.create(
            name="testrule",
            account=account,
            action=MailRule.MailAction.TAG,
            action_parameter="processed",
        )

        self.assertEqual(len(self.bogus_mailbox.messages), 3)
        self.assertEqual(len(self.bogus_mailbox.fetch("UNKEYWORD processed", False)), 2)

        self.mail_account_handler.handle_mail_account(account)
        self.apply_mail_actions()

        self.assertEqual(len(self.bogus_mailbox.messages), 3)
        self.assertEqual(len(self.bogus_mailbox.fetch("UNKEYWORD processed", False)), 0)

    def test_handle_mail_account_tag_gmail(self):
        self.bogus_mailbox._host = "imap.gmail.com"
        self.bogus_mailbox.client.capabilities = ["X-GM-EXT-1"]

        account = MailAccount.objects.create(
            name="test",
            imap_server="",
            username="admin",
            password="secret",
        )

        _ = MailRule.objects.create(
            name="testrule",
            account=account,
            action=MailRule.MailAction.TAG,
            action_parameter="processed",
        )

        self.assertEqual(len(self.bogus_mailbox.messages), 3)
        criteria = NOT(gmail_label="processed")
        self.assertEqual(len(self.bogus_mailbox.fetch(criteria, False)), 2)

        self.mail_account_handler.handle_mail_account(account)
        self.apply_mail_actions()

        self.assertEqual(len(self.bogus_mailbox.fetch(criteria, False)), 0)
        self.assertEqual(len(self.bogus_mailbox.messages), 3)

    def test_tag_mail_action_applemail_wrong_input(self):

        self.assertRaises(
            MailError,
            TagMailAction,
            "apple:black",
        )

    def test_handle_mail_account_tag_applemail(self):
        # all mails will be FLAGGED afterwards

        account = MailAccount.objects.create(
            name="test",
            imap_server="",
            username="admin",
            password="secret",
        )

        _ = MailRule.objects.create(
            name="testrule",
            account=account,
            action=MailRule.MailAction.TAG,
            action_parameter="apple:green",
        )

        self.assertEqual(len(self.bogus_mailbox.messages), 3)
        self.assertEqual(len(self.bogus_mailbox.fetch("UNFLAGGED", False)), 2)

        self.mail_account_handler.handle_mail_account(account)
        self.apply_mail_actions()

        self.assertEqual(len(self.bogus_mailbox.fetch("UNFLAGGED", False)), 0)
        self.assertEqual(len(self.bogus_mailbox.messages), 3)

    def test_error_login(self):
        account = MailAccount.objects.create(
            name="test",
            imap_server="",
            username="admin",
            password="wrong",
        )

        with self.assertRaisesRegex(
            MailError,
            "Error while authenticating account",
        ) as context:
            self.mail_account_handler.handle_mail_account(account)

    def test_error_skip_account(self):
        _ = MailAccount.objects.create(
            name="test",
            imap_server="",
            username="admin",
            password="wroasdng",
        )

        account = MailAccount.objects.create(
            name="test2",
            imap_server="",
            username="admin",
            password="secret",
        )
        _ = MailRule.objects.create(
            name="testrule",
            account=account,
            action=MailRule.MailAction.MOVE,
            action_parameter="spam",
            filter_subject="Claim",
        )

        tasks.process_mail_accounts()
        self.apply_mail_actions()

        self.assertEqual(len(self.bogus_mailbox.messages), 2)
        self.assertEqual(len(self.bogus_mailbox.messages_spam), 1)

    def test_error_skip_rule(self):

        account = MailAccount.objects.create(
            name="test2",
            imap_server="",
            username="admin",
            password="secret",
        )
        _ = MailRule.objects.create(
            name="testrule",
            account=account,
            action=MailRule.MailAction.MOVE,
            action_parameter="spam",
            filter_subject="Claim",
            order=1,
            folder="uuuhhhh",
        )
        _ = MailRule.objects.create(
            name="testrule2",
            account=account,
            action=MailRule.MailAction.MOVE,
            action_parameter="spam",
            filter_subject="Claim",
            order=2,
        )

        self.mail_account_handler.handle_mail_account(account)
        self.apply_mail_actions()

        self.assertEqual(len(self.bogus_mailbox.messages), 2)
        self.assertEqual(len(self.bogus_mailbox.messages_spam), 1)

    def test_error_folder_set(self):
        """
        GIVEN:
            - Mail rule with non-existent folder
        THEN:
            - Should call list to output all folders in the account
            - Should not process any messages
        """
        account = MailAccount.objects.create(
            name="test2",
            imap_server="",
            username="admin",
            password="secret",
        )
        _ = MailRule.objects.create(
            name="testrule",
            account=account,
            action=MailRule.MailAction.MOVE,
            action_parameter="spam",
            filter_subject="Claim",
            order=1,
            folder="uuuhhhh",  # Invalid folder name
        )

        self.bogus_mailbox.folder.list = mock.Mock(
            return_value=[FolderInfo("SomeFoldername", "|", ())],
        )

        self.mail_account_handler.handle_mail_account(account)

        self.bogus_mailbox.folder.list.assert_called_once()
        self.assertEqual(self._queue_consumption_tasks_mock.call_count, 0)

    def test_error_folder_set_error_listing(self):
        """
        GIVEN:
            - Mail rule with non-existent folder
            - Mail account folder listing raises exception
        THEN:
            - Should not process any messages
        """
        account = MailAccount.objects.create(
            name="test2",
            imap_server="",
            username="admin",
            password="secret",
        )
        _ = MailRule.objects.create(
            name="testrule",
            account=account,
            action=MailRule.MailAction.MOVE,
            action_parameter="spam",
            filter_subject="Claim",
            order=1,
            folder="uuuhhhh",  # Invalid folder name
        )

        self.bogus_mailbox.folder.list = mock.Mock(
            side_effect=MailboxFolderSelectError(None, "uhm"),
        )

        self.mail_account_handler.handle_mail_account(account)

        self.bogus_mailbox.folder.list.assert_called_once()
        self.assertEqual(self._queue_consumption_tasks_mock.call_count, 0)

    @mock.patch("paperless_mail.mail.MailAccountHandler._get_correspondent")
    def test_error_skip_mail(self, m):
        def get_correspondent_fake(message, rule):
            if message.from_ == "amazon@amazon.de":
                raise ValueError("Does not compute.")
            else:
                return None

        m.side_effect = get_correspondent_fake

        account = MailAccount.objects.create(
            name="test2",
            imap_server="",
            username="admin",
            password="secret",
        )
        _ = MailRule.objects.create(
            name="testrule",
            account=account,
            action=MailRule.MailAction.MOVE,
            action_parameter="spam",
        )

        self.mail_account_handler.handle_mail_account(account)
        self.apply_mail_actions()

        # test that we still consume mail even if some mails throw errors.
        self.assertEqual(self._queue_consumption_tasks_mock.call_count, 2)

        # faulty mail still in inbox, untouched
        self.assertEqual(len(self.bogus_mailbox.messages), 1)
        self.assertEqual(self.bogus_mailbox.messages[0].from_, "amazon@amazon.de")

    def test_error_create_correspondent(self):

        account = MailAccount.objects.create(
            name="test2",
            imap_server="",
            username="admin",
            password="secret",
        )
        _ = MailRule.objects.create(
            name="testrule",
            filter_from="amazon@amazon.de",
            account=account,
            action=MailRule.MailAction.MOVE,
            action_parameter="spam",
            assign_correspondent_from=MailRule.CorrespondentSource.FROM_EMAIL,
        )

        self.mail_account_handler.handle_mail_account(account)

        self._queue_consumption_tasks_mock.assert_called_once()

        c = Correspondent.objects.get(name="amazon@amazon.de")
        self.assert_queue_consumption_tasks_call_args(
            [
                [
                    {"override_correspondent_id": c.id},
                ],
            ],
        )

        self._queue_consumption_tasks_mock.reset_mock()
        self.reset_bogus_mailbox()

        with mock.patch("paperless_mail.mail.Correspondent.objects.get_or_create") as m:
            m.side_effect = DatabaseError()

            self.mail_account_handler.handle_mail_account(account)

        self.assert_queue_consumption_tasks_call_args(
            [
                [
                    {"override_correspondent_id": None},
                ],
            ],
        )

    def test_filters(self):

        account = MailAccount.objects.create(
            name="test3",
            imap_server="",
            username="admin",
            password="secret",
        )

        for (f_body, f_from, f_to, f_subject, expected_mail_count) in [
            (None, None, None, "Claim", 1),
            ("electronic", None, None, None, 1),
            (None, "amazon", None, None, 2),
            ("cables", "amazon", None, "Invoice", 1),
            (None, None, "test@email.com", None, 0),
            (None, None, "invoices@mycompany.com", None, 1),
            ("electronic", None, "invoices@mycompany.com", None, 1),
            (None, "amazon", "me@myselfandi.com", None, 1),
        ]:
            with self.subTest(f_body=f_body, f_from=f_from, f_subject=f_subject):
                MailRule.objects.all().delete()
                _ = MailRule.objects.create(
                    name="testrule3",
                    account=account,
                    action=MailRule.MailAction.DELETE,
                    filter_subject=f_subject,
                    filter_body=f_body,
                    filter_from=f_from,
                    filter_to=f_to,
                )
                self.reset_bogus_mailbox()
                self._queue_consumption_tasks_mock.reset_mock()

                self.assertEqual(self._queue_consumption_tasks_mock.call_count, 0)
                self.assertEqual(len(self.bogus_mailbox.messages), 3)

                self.mail_account_handler.handle_mail_account(account)
                self.apply_mail_actions()

                self.assertEqual(
                    len(self.bogus_mailbox.messages),
                    3 - expected_mail_count,
                )
                self.assertEqual(
                    self._queue_consumption_tasks_mock.call_count,
                    expected_mail_count,
                )

    def test_auth_plain_fallback(self):
        """
        GIVEN:
            - Mail account with password containing non-ASCII characters
        THEN:
            - Should still authenticate to the mail account
        """
        account = MailAccount.objects.create(
            name="test",
            imap_server="",
            username=BogusMailBox.USERNAME,
            # Note the non-ascii characters here
            password=BogusMailBox.UTF_PASSWORD,
        )

        _ = MailRule.objects.create(
            name="testrule",
            account=account,
            action=MailRule.MailAction.MARK_READ,
        )

        self.assertEqual(len(self.bogus_mailbox.messages), 3)
        self.assertEqual(self._queue_consumption_tasks_mock.call_count, 0)
        self.assertEqual(len(self.bogus_mailbox.fetch("UNSEEN", False)), 2)

        self.mail_account_handler.handle_mail_account(account)
        self.apply_mail_actions()

        self.assertEqual(self._queue_consumption_tasks_mock.call_count, 2)
        self.assertEqual(len(self.bogus_mailbox.fetch("UNSEEN", False)), 0)
        self.assertEqual(len(self.bogus_mailbox.messages), 3)

    def test_auth_plain_fallback_fails_still(self):
        """
        GIVEN:
            - Mail account with password containing non-ASCII characters
            - Incorrect password value
        THEN:
            - Should raise a MailError for the account
        """
        account = MailAccount.objects.create(
            name="test",
            imap_server="",
            username=BogusMailBox.USERNAME,
            # Note the non-ascii characters here
            # Passes the check in login, not in authenticate
            password="réception",
        )

        _ = MailRule.objects.create(
            name="testrule",
            account=account,
            action=MailRule.MailAction.MARK_READ,
        )

        self.assertRaises(
            MailError,
            self.mail_account_handler.handle_mail_account,
            account,
        )

    def assert_queue_consumption_tasks_call_args(self, expected_call_args: List):
        """
        Verifies that queue_consumption_tasks has been called with the expected arguments.

        expected_call_args is the following format:

        * List of calls to queue_consumption_tasks, called once per mail, where each element is:
        * List of signatures for the consume_file task, where each element is:
        * dictionary containing arguments that need to be present in the consume_file signature.

        """

        # assert number of calls to queue_consumption_tasks mathc
        self.assertEqual(
            len(self._queue_consumption_tasks_mock.call_args_list),
            len(expected_call_args),
        )

        for (mock_args, mock_kwargs), expected_signatures in zip(
            self._queue_consumption_tasks_mock.call_args_list,
            expected_call_args,
        ):
            consume_tasks = mock_kwargs["consume_tasks"]

            # assert number of consume_file tasks match
            self.assertEqual(len(consume_tasks), len(expected_signatures))

            for consume_task, expected_signature in zip(
                consume_tasks,
                expected_signatures,
            ):
                # assert the file exists
                self.assertIsFile(consume_task.kwargs["path"])

                # assert all expected arguments are present in the signature
                for key, value in expected_signature.items():
                    self.assertIn(key, consume_task.kwargs)
                    self.assertEqual(consume_task.kwargs[key], value)

    def apply_mail_actions(self):
        """
        Applies pending actions to mails by inspecting calls to the queue_consumption_tasks method.
        """
        for args, kwargs in self._queue_consumption_tasks_mock.call_args_list:
            message = kwargs["message"]
            rule = kwargs["rule"]
            apply_mail_action([], rule.pk, message.uid, message.subject, message.date)


class TestManagementCommand(TestCase):
    @mock.patch(
        "paperless_mail.management.commands.mail_fetcher.tasks.process_mail_accounts",
    )
    def test_mail_fetcher(self, m):
        call_command("mail_fetcher")

        m.assert_called_once()


class TestTasks(TestCase):
    @mock.patch("paperless_mail.tasks.MailAccountHandler.handle_mail_account")
    def test_all_accounts(self, m):
        m.side_effect = lambda account: 6

        MailAccount.objects.create(
            name="A",
            imap_server="A",
            username="A",
            password="A",
        )
        MailAccount.objects.create(
            name="B",
            imap_server="A",
            username="A",
            password="A",
        )

        result = tasks.process_mail_accounts()

        self.assertEqual(m.call_count, 2)
        self.assertIn("Added 12", result)

        m.side_effect = lambda account: 0
        result = tasks.process_mail_accounts()
        self.assertIn("No new", result)