Allow unknown activity entities and missing channelData

[dcaayushd]

Fixes #433

What changed

• Add a fallback UnknownEntity so new entity types do not break activity parsing
• Make conversationUpdate channelData optional to avoid 500s on missing data
• Add tests for unknown entities and missing channelData

Why

Real Bot Framework traffic can include new entity types and sometimes skips channelData. These should not block message handling.

Tests

• PYTHONPATH=packages/api/src:packages/common/src:packages/cards/src /Users/dcaayushd/Development/OpenSourceContribution/teams.py/venv/bin/python -m pytest packages/api/tests/unit/test_activity.py -k ActivityTypeAdapter
• PYTHONPATH=packages/api/src:packages/common/src:packages/cards/src /Users/dcaayushd/Development/OpenSourceContribution/teams.py/venv/bin/python -m pytest packages/api/tests/unit/test_activity.py

[Copilot]

Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

Adds forward-compatible handling for unknown activity entity types and relaxes conversationUpdate parsing when channelData is absent.

Changes:

• Introduces UnknownEntity and includes it in the Entity union / exports.
• Updates ConversationUpdateActivity.channel_data to be optional with a default of None.
• Adds unit tests validating ActivityTypeAdapter behavior for unknown entities and missing channelData.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
packages/api/tests/unit/test_activity.py	Adds unit coverage for unknown entity passthrough and optional channel_data on conversation updates.
packages/api/src/microsoft_teams/api/models/entity/unknown_entity.py	Introduces a new model type intended to capture unknown/forward-compatible entities.
packages/api/src/microsoft_teams/api/models/entity/entity.py	Adds UnknownEntity into the Entity union for parsing.
packages/api/src/microsoft_teams/api/models/entity/init.py	Exposes UnknownEntity as part of the public entity API.
packages/api/src/microsoft_teams/api/activities/conversation/conversation_update.py	Makes channel_data optional to support payloads without channelData.

[dcaayushd]

@heyitsaamir Could you please review this PR and approve the workflow when you have a chance? Thanks!

[mjamroz]

@mjamroz Could you please review this PR and approve the workflow when you have a chance? Thanks!

Hey @dcaayushd i believe it's some mistake, im not Microsoft staff neither related with teams.py

[dcaayushd]

Sorry about the wrong tag! I'll find the right maintainer to review this.