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chatmail-core/deltachat-rpc-client/tests/test_securejoin.py
link2xt 65c9e72bf4 test: test withdrawing group join QR codes
2024-04-05 22:34:02 +00:00

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import logging
import pytest
from deltachat_rpc_client import Chat, EventType, SpecialContactId
def test_qr_setup_contact(acfactory, tmp_path) -> None:
alice, bob = acfactory.get_online_accounts(2)
qr_code, _svg = alice.get_qr_code()
bob.secure_join(qr_code)
alice.wait_for_securejoin_inviter_success()
# Test that Alice verified Bob's profile.
alice_contact_bob = alice.get_contact_by_addr(bob.get_config("addr"))
alice_contact_bob_snapshot = alice_contact_bob.get_snapshot()
assert alice_contact_bob_snapshot.is_verified
bob.wait_for_securejoin_joiner_success()
# Test that Bob verified Alice's profile.
bob_contact_alice = bob.get_contact_by_addr(alice.get_config("addr"))
bob_contact_alice_snapshot = bob_contact_alice.get_snapshot()
assert bob_contact_alice_snapshot.is_verified
# Test that if Bob changes the key, backwards verification is lost.
logging.info("Bob 2 is created")
bob2 = acfactory.new_configured_account()
bob2.export_self_keys(tmp_path)
logging.info("Bob imports a key")
bob.import_self_keys(tmp_path / "private-key-default.asc")
assert bob.get_config("key_id") == "2"
bob_contact_alice_snapshot = bob_contact_alice.get_snapshot()
assert not bob_contact_alice_snapshot.is_verified
@pytest.mark.parametrize("protect", [True, False])
def test_qr_securejoin(acfactory, protect):
alice, bob = acfactory.get_online_accounts(2)
logging.info("Alice creates a verified group")
alice_chat = alice.create_group("Verified group", protect=protect)
assert alice_chat.get_basic_snapshot().is_protected == protect
logging.info("Bob joins verified group")
qr_code, _svg = alice_chat.get_qr_code()
bob.secure_join(qr_code)
# Check that at least some of the handshake messages are deleted.
for ac in [alice, bob]:
while True:
event = ac.wait_for_event()
if event["kind"] == "ImapMessageDeleted":
break
alice.wait_for_securejoin_inviter_success()
# Test that Alice verified Bob's profile.
alice_contact_bob = alice.get_contact_by_addr(bob.get_config("addr"))
alice_contact_bob_snapshot = alice_contact_bob.get_snapshot()
assert alice_contact_bob_snapshot.is_verified
bob.wait_for_securejoin_joiner_success()
snapshot = bob.get_message_by_id(bob.wait_for_incoming_msg_event().msg_id).get_snapshot()
assert snapshot.text == "Member Me ({}) added by {}.".format(bob.get_config("addr"), alice.get_config("addr"))
assert snapshot.chat.get_basic_snapshot().is_protected == protect
# Test that Bob verified Alice's profile.
bob_contact_alice = bob.get_contact_by_addr(alice.get_config("addr"))
bob_contact_alice_snapshot = bob_contact_alice.get_snapshot()
assert bob_contact_alice_snapshot.is_verified
def test_qr_securejoin_contact_request(acfactory) -> None:
"""Alice invites Bob to a group when Bob's chat with Alice is in a contact request mode."""
alice, bob = acfactory.get_online_accounts(2)
bob_addr = bob.get_config("addr")
alice_contact_bob = alice.create_contact(bob_addr, "Bob")
alice_chat_bob = alice_contact_bob.create_chat()
alice_chat_bob.send_text("Hello!")
snapshot = bob.get_message_by_id(bob.wait_for_incoming_msg_event().msg_id).get_snapshot()
assert snapshot.text == "Hello!"
bob_chat_alice = snapshot.chat
assert bob_chat_alice.get_basic_snapshot().is_contact_request
alice_chat = alice.create_group("Verified group", protect=True)
logging.info("Bob joins verified group")
qr_code, _svg = alice_chat.get_qr_code()
bob.secure_join(qr_code)
while True:
event = bob.wait_for_event()
if event["kind"] == "SecurejoinJoinerProgress" and event["progress"] == 1000:
break
# Chat stays being a contact request.
assert bob_chat_alice.get_basic_snapshot().is_contact_request
def test_qr_readreceipt(acfactory) -> None:
alice, bob, charlie = acfactory.get_online_accounts(3)
logging.info("Bob and Charlie setup contact with Alice")
qr_code, _svg = alice.get_qr_code()
bob.secure_join(qr_code)
charlie.secure_join(qr_code)
for joiner in [bob, charlie]:
joiner.wait_for_securejoin_joiner_success()
logging.info("Alice creates a verified group")
group = alice.create_group("Group", protect=True)
bob_addr = bob.get_config("addr")
charlie_addr = charlie.get_config("addr")
alice_contact_bob = alice.create_contact(bob_addr, "Bob")
alice_contact_charlie = alice.create_contact(charlie_addr, "Charlie")
group.add_contact(alice_contact_bob)
group.add_contact(alice_contact_charlie)
# Promote a group.
group.send_message(text="Hello")
logging.info("Bob and Charlie receive a group")
bob_msg_id = bob.wait_for_incoming_msg_event().msg_id
bob_message = bob.get_message_by_id(bob_msg_id)
bob_snapshot = bob_message.get_snapshot()
assert bob_snapshot.text == "Hello"
# Charlie receives the same "Hello" message as Bob.
charlie.wait_for_incoming_msg_event()
logging.info("Bob sends a message to the group")
bob_out_message = bob_snapshot.chat.send_message(text="Hi from Bob!")
charlie_msg_id = charlie.wait_for_incoming_msg_event().msg_id
charlie_message = charlie.get_message_by_id(charlie_msg_id)
charlie_snapshot = charlie_message.get_snapshot()
assert charlie_snapshot.text == "Hi from Bob!"
bob_contact_charlie = bob.create_contact(charlie_addr, "Charlie")
assert not bob.get_chat_by_contact(bob_contact_charlie)
logging.info("Charlie reads Bob's message")
charlie_message.mark_seen()
while True:
event = bob.wait_for_event()
if event["kind"] == "MsgRead" and event["msg_id"] == bob_out_message.id:
break
# Receiving a read receipt from Charlie
# should not unblock hidden chat with Charlie for Bob.
assert not bob.get_chat_by_contact(bob_contact_charlie)
def test_setup_contact_resetup(acfactory) -> None:
"""Tests that setup contact works after Alice resets the device and changes the key."""
alice, bob = acfactory.get_online_accounts(2)
qr_code, _svg = alice.get_qr_code()
bob.secure_join(qr_code)
bob.wait_for_securejoin_joiner_success()
alice = acfactory.resetup_account(alice)
qr_code, _svg = alice.get_qr_code()
bob.secure_join(qr_code)
bob.wait_for_securejoin_joiner_success()
def test_verified_group_recovery(acfactory) -> None:
"""Tests verified group recovery by reverifying a member and sending a message in a group."""
ac1, ac2, ac3 = acfactory.get_online_accounts(3)
logging.info("ac1 creates verified group")
chat = ac1.create_group("Verified group", protect=True)
assert chat.get_basic_snapshot().is_protected
logging.info("ac2 joins verified group")
qr_code, _svg = chat.get_qr_code()
ac2.secure_join(qr_code)
ac2.wait_for_securejoin_joiner_success()
# ac1 has ac2 directly verified.
ac1_contact_ac2 = ac1.get_contact_by_addr(ac2.get_config("addr"))
assert ac1_contact_ac2.get_snapshot().verifier_id == SpecialContactId.SELF
logging.info("ac3 joins verified group")
ac3_chat = ac3.secure_join(qr_code)
ac3.wait_for_securejoin_joiner_success()
ac3.wait_for_incoming_msg_event() # Member added
logging.info("ac2 logs in on a new device")
ac2 = acfactory.resetup_account(ac2)
logging.info("ac2 reverifies with ac3")
qr_code, _svg = ac3.get_qr_code()
ac2.secure_join(qr_code)
ac2.wait_for_securejoin_joiner_success()
logging.info("ac3 sends a message to the group")
assert len(ac3_chat.get_contacts()) == 3
ac3_chat.send_text("Hi!")
snapshot = ac1.get_message_by_id(ac1.wait_for_incoming_msg_event().msg_id).get_snapshot()
assert snapshot.text == "Hi!"
msg_id = ac2.wait_for_incoming_msg_event().msg_id
message = ac2.get_message_by_id(msg_id)
snapshot = message.get_snapshot()
assert snapshot.text == "Hi!"
# ac1 contact is verified for ac2 because ac3 gossiped ac1 key in the "Hi!" message.
ac1_contact = ac2.get_contact_by_addr(ac1.get_config("addr"))
assert ac1_contact.get_snapshot().is_verified
# ac2 can write messages to the group.
snapshot.chat.send_text("Works again!")
snapshot = ac3.get_message_by_id(ac3.wait_for_incoming_msg_event().msg_id).get_snapshot()
assert snapshot.text == "Works again!"
snapshot = ac1.get_message_by_id(ac1.wait_for_incoming_msg_event().msg_id).get_snapshot()
assert snapshot.text == "Works again!"
ac1_chat_messages = snapshot.chat.get_messages()
ac2_addr = ac2.get_config("addr")
assert ac1_chat_messages[-2].get_snapshot().text == f"Changed setup for {ac2_addr}"
# ac2 is now verified by ac3 for ac1
ac1_contact_ac3 = ac1.get_contact_by_addr(ac3.get_config("addr"))
assert ac1_contact_ac2.get_snapshot().verifier_id == ac1_contact_ac3.id
def test_verified_group_member_added_recovery(acfactory) -> None:
"""Tests verified group recovery by reverifiying than removing and adding a member back."""
ac1, ac2, ac3 = acfactory.get_online_accounts(3)
logging.info("ac1 creates verified group")
chat = ac1.create_group("Verified group", protect=True)
assert chat.get_basic_snapshot().is_protected
logging.info("ac2 joins verified group")
qr_code, _svg = chat.get_qr_code()
ac2.secure_join(qr_code)
ac2.wait_for_securejoin_joiner_success()
# ac1 has ac2 directly verified.
ac1_contact_ac2 = ac1.get_contact_by_addr(ac2.get_config("addr"))
assert ac1_contact_ac2.get_snapshot().verifier_id == SpecialContactId.SELF
logging.info("ac3 joins verified group")
ac3_chat = ac3.secure_join(qr_code)
ac3.wait_for_securejoin_joiner_success()
ac3.wait_for_incoming_msg_event() # Member added
logging.info("ac2 logs in on a new device")
ac2 = acfactory.resetup_account(ac2)
logging.info("ac2 reverifies with ac3")
qr_code, _svg = ac3.get_qr_code()
ac2.secure_join(qr_code)
ac2.wait_for_securejoin_joiner_success()
logging.info("ac3 sends a message to the group")
assert len(ac3_chat.get_contacts()) == 3
ac3_chat.send_text("Hi!")
msg_id = ac2.wait_for_incoming_msg_event().msg_id
message = ac2.get_message_by_id(msg_id)
snapshot = message.get_snapshot()
logging.info("Received message %s", snapshot.text)
assert snapshot.text == "Hi!"
ac1.wait_for_incoming_msg_event() # Hi!
ac3_contact_ac2 = ac3.get_contact_by_addr(ac2.get_config("addr"))
ac3_chat.remove_contact(ac3_contact_ac2)
ac3_chat.add_contact(ac3_contact_ac2)
msg_id = ac2.wait_for_incoming_msg_event().msg_id
message = ac2.get_message_by_id(msg_id)
snapshot = message.get_snapshot()
assert "removed" in snapshot.text
snapshot = ac1.get_message_by_id(ac1.wait_for_incoming_msg_event().msg_id).get_snapshot()
assert "removed" in snapshot.text
event = ac2.wait_for_incoming_msg_event()
msg_id = event.msg_id
chat_id = event.chat_id
message = ac2.get_message_by_id(msg_id)
snapshot = message.get_snapshot()
logging.info("ac2 got event message: %s", snapshot.text)
assert "added" in snapshot.text
snapshot = ac1.get_message_by_id(ac1.wait_for_incoming_msg_event().msg_id).get_snapshot()
assert "added" in snapshot.text
chat = Chat(ac2, chat_id)
chat.send_text("Works again!")
msg_id = ac3.wait_for_incoming_msg_event().msg_id
message = ac3.get_message_by_id(msg_id)
snapshot = message.get_snapshot()
assert snapshot.text == "Works again!"
snapshot = ac1.get_message_by_id(ac1.wait_for_incoming_msg_event().msg_id).get_snapshot()
assert snapshot.text == "Works again!"
ac1_contact_ac2 = ac1.get_contact_by_addr(ac2.get_config("addr"))
ac1_contact_ac2_snapshot = ac1_contact_ac2.get_snapshot()
assert ac1_contact_ac2_snapshot.is_verified
assert ac1_contact_ac2_snapshot.verifier_id == ac1.get_contact_by_addr(ac3.get_config("addr")).id
# ac2 is now verified by ac3 for ac1
ac1_contact_ac3 = ac1.get_contact_by_addr(ac3.get_config("addr"))
assert ac1_contact_ac2.get_snapshot().verifier_id == ac1_contact_ac3.id
def test_qr_join_chat_with_pending_bobstate_issue4894(acfactory):
"""Regression test for
issue <https://github.com/deltachat/deltachat-core-rust/issues/4894>.
"""
ac1, ac2, ac3, ac4 = acfactory.get_online_accounts(4)
logging.info("ac3: verify with ac2")
qr_code, _svg = ac2.get_qr_code()
ac3.secure_join(qr_code)
ac2.wait_for_securejoin_inviter_success()
# in order for ac2 to have pending bobstate with a verified group
# we first create a fully joined verified group, and then start
# joining a second time but interrupt it, to create pending bob state
logging.info("ac1: create verified group that ac2 fully joins")
ch1 = ac1.create_group("Group", protect=True)
qr_code, _svg = ch1.get_qr_code()
ac2.secure_join(qr_code)
ac1.wait_for_securejoin_inviter_success()
# ensure ac1 can write and ac2 receives messages in verified chat
ch1.send_text("ac1 says hello")
while 1:
snapshot = ac2.get_message_by_id(ac2.wait_for_incoming_msg_event().msg_id).get_snapshot()
if snapshot.text == "ac1 says hello":
assert snapshot.chat.get_basic_snapshot().is_protected
break
logging.info("ac1: let ac2 join again but shutoff ac1 in the middle of securejoin")
qr_code, _svg = ch1.get_qr_code()
ac2.secure_join(qr_code)
ac1.remove()
logging.info("ac2 now has pending bobstate but ac1 is shutoff")
# we meanwhile expect ac3/ac2 verification started in the beginning to have completed
assert ac3.get_contact_by_addr(ac2.get_config("addr")).get_snapshot().is_verified
assert ac2.get_contact_by_addr(ac3.get_config("addr")).get_snapshot().is_verified
logging.info("ac3: create a verified group VG with ac2")
vg = ac3.create_group("ac3-created", protect=True)
vg.add_contact(ac3.get_contact_by_addr(ac2.get_config("addr")))
# ensure ac2 receives message in VG
vg.send_text("hello")
while 1:
msg = ac2.get_message_by_id(ac2.wait_for_incoming_msg_event().msg_id).get_snapshot()
if msg.text == "hello":
assert msg.chat.get_basic_snapshot().is_protected
break
logging.info("ac3: create a join-code for group VG and let ac4 join, check that ac2 got it")
qr_code, _svg = vg.get_qr_code()
ac4.secure_join(qr_code)
ac3.wait_for_securejoin_inviter_success()
while 1:
ev = ac2.wait_for_event()
if "added by unrelated SecureJoin" in str(ev):
return
def test_qr_new_group_unblocked(acfactory):
"""Regression test for a bug introduced in core v1.113.0.
ac2 scans a verified group QR code created by ac1.
This results in creation of a blocked 1:1 chat with ac1 on ac2,
but ac1 contact is not blocked on ac2.
Then ac1 creates a group, adds ac2 there and promotes it by sending a message.
ac2 should receive a message and create a contact request for the group.
Due to a bug previously ac2 created a blocked group.
"""
ac1, ac2 = acfactory.get_online_accounts(2)
ac1_chat = ac1.create_group("Group for joining", protect=True)
qr_code, _svg = ac1_chat.get_qr_code()
ac2.secure_join(qr_code)
ac1.wait_for_securejoin_inviter_success()
ac1_new_chat = ac1.create_group("Another group")
ac1_new_chat.add_contact(ac1.get_contact_by_addr(ac2.get_config("addr")))
# Receive "Member added" message.
ac2.wait_for_incoming_msg_event()
ac1_new_chat.send_text("Hello!")
ac2_msg = ac2.get_message_by_id(ac2.wait_for_incoming_msg_event().msg_id).get_snapshot()
assert ac2_msg.text == "Hello!"
assert ac2_msg.chat.get_basic_snapshot().is_contact_request
def test_aeap_flow_verified(acfactory):
"""Test that a new address is added to a contact when it changes its address."""
ac1, ac2, ac1new = acfactory.get_online_accounts(3)
logging.info("ac1: create verified-group QR, ac2 scans and joins")
chat = ac1.create_group("hello", protect=True)
assert chat.get_basic_snapshot().is_protected
qr_code, _svg = chat.get_qr_code()
logging.info("ac2: start QR-code based join-group protocol")
ac2.secure_join(qr_code)
ac1.wait_for_securejoin_inviter_success()
logging.info("sending first message")
msg_out = chat.send_text("old address").get_snapshot()
logging.info("receiving first message")
ac2.wait_for_incoming_msg_event() # member added message
msg_in_1 = ac2.get_message_by_id(ac2.wait_for_incoming_msg_event().msg_id).get_snapshot()
assert msg_in_1.text == msg_out.text
logging.info("changing email account")
ac1.set_config("addr", ac1new.get_config("addr"))
ac1.set_config("mail_pw", ac1new.get_config("mail_pw"))
ac1.stop_io()
ac1.configure()
ac1.start_io()
logging.info("sending second message")
msg_out = chat.send_text("changed address").get_snapshot()
logging.info("receiving second message")
msg_in_2 = ac2.get_message_by_id(ac2.wait_for_incoming_msg_event().msg_id)
msg_in_2_snapshot = msg_in_2.get_snapshot()
assert msg_in_2_snapshot.text == msg_out.text
assert msg_in_2_snapshot.chat.id == msg_in_1.chat.id
assert msg_in_2.get_sender_contact().get_snapshot().address == ac1new.get_config("addr")
assert len(msg_in_2_snapshot.chat.get_contacts()) == 2
assert ac1new.get_config("addr") in [
contact.get_snapshot().address for contact in msg_in_2_snapshot.chat.get_contacts()
]
def test_gossip_verification(acfactory) -> None:
alice, bob, carol = acfactory.get_online_accounts(3)
# Bob verifies Alice.
qr_code, _svg = alice.get_qr_code()
bob.secure_join(qr_code)
bob.wait_for_securejoin_joiner_success()
# Bob verifies Carol.
qr_code, _svg = carol.get_qr_code()
bob.secure_join(qr_code)
bob.wait_for_securejoin_joiner_success()
bob_contact_alice = bob.create_contact(alice.get_config("addr"), "Alice")
bob_contact_carol = bob.create_contact(carol.get_config("addr"), "Carol")
carol_contact_alice = carol.create_contact(alice.get_config("addr"), "Alice")
logging.info("Bob creates an Autocrypt group")
bob_group_chat = bob.create_group("Autocrypt Group")
assert not bob_group_chat.get_basic_snapshot().is_protected
bob_group_chat.add_contact(bob_contact_alice)
bob_group_chat.add_contact(bob_contact_carol)
bob_group_chat.send_message(text="Hello Autocrypt group")
snapshot = carol.get_message_by_id(carol.wait_for_incoming_msg_event().msg_id).get_snapshot()
assert snapshot.text == "Hello Autocrypt group"
assert snapshot.show_padlock
# Autocrypt group does not propagate verification.
carol_contact_alice_snapshot = carol_contact_alice.get_snapshot()
assert not carol_contact_alice_snapshot.is_verified
logging.info("Bob creates a Securejoin group")
bob_group_chat = bob.create_group("Securejoin Group", protect=True)
assert bob_group_chat.get_basic_snapshot().is_protected
bob_group_chat.add_contact(bob_contact_alice)
bob_group_chat.add_contact(bob_contact_carol)
bob_group_chat.send_message(text="Hello Securejoin group")
snapshot = carol.get_message_by_id(carol.wait_for_incoming_msg_event().msg_id).get_snapshot()
assert snapshot.text == "Hello Securejoin group"
assert snapshot.show_padlock
# Securejoin propagates verification.
carol_contact_alice_snapshot = carol_contact_alice.get_snapshot()
assert carol_contact_alice_snapshot.is_verified
def test_securejoin_after_contact_resetup(acfactory) -> None:
"""
Regression test for a bug that prevented joining verified group with a QR code
if the group is already created and contains
a contact with inconsistent (Autocrypt and verified keys exist but don't match) key state.
"""
ac1, ac2, ac3 = acfactory.get_online_accounts(3)
# ac3 creates protected group with ac1.
ac3_chat = ac3.create_group("Verified group", protect=True)
# ac1 joins ac3 group.
ac3_qr_code, _svg = ac3_chat.get_qr_code()
ac1.secure_join(ac3_qr_code)
ac1.wait_for_securejoin_joiner_success()
# ac1 waits for member added message and creates a QR code.
snapshot = ac1.get_message_by_id(ac1.wait_for_incoming_msg_event().msg_id).get_snapshot()
ac1_qr_code, _svg = snapshot.chat.get_qr_code()
# ac2 verifies ac1
qr_code, _svg = ac1.get_qr_code()
ac2.secure_join(qr_code)
ac2.wait_for_securejoin_joiner_success()
# ac1 is verified for ac2.
ac2_contact_ac1 = ac2.create_contact(ac1.get_config("addr"), "")
assert ac2_contact_ac1.get_snapshot().is_verified
# ac1 resetups the account.
ac1 = acfactory.resetup_account(ac1)
# ac1 sends a message to ac2.
ac1_contact_ac2 = ac1.create_contact(ac2.get_config("addr"), "")
ac1_chat_ac2 = ac1_contact_ac2.create_chat()
ac1_chat_ac2.send_text("Hello!")
# ac2 receives a message.
snapshot = ac2.get_message_by_id(ac2.wait_for_incoming_msg_event().msg_id).get_snapshot()
assert snapshot.text == "Hello!"
# ac1 is no longer verified for ac2 as new Autocrypt key is not the same as old verified key.
assert not ac2_contact_ac1.get_snapshot().is_verified
# ac1 goes offline.
ac1.remove()
# Scanning a QR code results in creating an unprotected group with an inviter.
# In this case inviter is ac1 which has an inconsistent key state.
# Normally inviter becomes verified as a result of Securejoin protocol
# and then the group chat becomes verified when "Member added" is received,
# but in this case ac1 is offline and this Securejoin process will never finish.
logging.info("ac2 scans ac1 QR code, this is not expected to finish")
ac2.secure_join(ac1_qr_code)
logging.info("ac2 scans ac3 QR code")
ac2.secure_join(ac3_qr_code)
logging.info("ac2 waits for joiner success")
ac2.wait_for_securejoin_joiner_success()
# Wait for member added.
logging.info("ac2 waits for member added message")
snapshot = ac2.get_message_by_id(ac2.wait_for_incoming_msg_event().msg_id).get_snapshot()
assert snapshot.is_info
ac2_chat = snapshot.chat
assert ac2_chat.get_basic_snapshot().is_protected
assert len(ac2_chat.get_contacts()) == 3
# ac1 is still "not verified" for ac2 due to inconsistent state.
assert not ac2_contact_ac1.get_snapshot().is_verified
def test_withdraw_securejoin_qr(acfactory):
alice, bob = acfactory.get_online_accounts(2)
logging.info("Alice creates a verified group")
alice_chat = alice.create_group("Verified group", protect=True)
assert alice_chat.get_basic_snapshot().is_protected
logging.info("Bob joins verified group")
qr_code, _svg = alice_chat.get_qr_code()
bob_chat = bob.secure_join(qr_code)
bob.wait_for_securejoin_joiner_success()
snapshot = bob.get_message_by_id(bob.wait_for_incoming_msg_event().msg_id).get_snapshot()
assert snapshot.text == "Member Me ({}) added by {}.".format(bob.get_config("addr"), alice.get_config("addr"))
assert snapshot.chat.get_basic_snapshot().is_protected
bob_chat.leave()
snapshot = alice.get_message_by_id(alice.wait_for_incoming_msg_event().msg_id).get_snapshot()
assert snapshot.text == "Group left by {}.".format(bob.get_config("addr"))
logging.info("Alice withdraws QR code.")
qr = alice.check_qr(qr_code)
assert qr["kind"] == "withdrawVerifyGroup"
alice.set_config_from_qr(qr_code)
logging.info("Bob scans withdrawn QR code.")
bob_chat = bob.secure_join(qr_code)
logging.info("Bob scanned withdrawn QR code")
while True:
event = alice.wait_for_event()
if event.kind == EventType.MSGS_CHANGED and event.chat_id != 0:
break
snapshot = alice.get_message_by_id(event.msg_id).get_snapshot()
assert snapshot.text == "Cannot establish guaranteed end-to-end encryption with {}".format(bob.get_config("addr"))
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