Add UMI support in MSAL #192
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## Context This fixes #184 which stated that the token wasn't being refreshed after an hour. This was because we weren't refreshing it on use. In typescript, we refresh the token on every [app.process](https://github.com/microsoft/teams.ts/blob/1f2d735ce02d0add1dc308f9e9df28f0c3fb6985/packages/apps/src/app.process.ts#L31). But this actually still leaves _proactive scenarios_ to used an cached, potentially expired, tokens. To remediate this, the token that gets passed to the API is a factory which refreshes the token if the cached token is expired. For the record C# sets the token value to be [refreshable](https://github.com/microsoft/teams.net/blob/19e4df96dac1524ae99d6c06bd4891fa5535ca67/Libraries/Microsoft.Teams.Apps/App.cs#L67C1-L67C46) (just as this PR is attempting to do). ## Changes This PR includes several changes 1. No more graph token manager. Instead we now have a TokenManager which manages all tokens. Soon, this might change to msal doing the changes 2. The app no longer refreshes token on start. But it does it the first time the token is being used. Because of this, the id field is now from the credentials, and the "name" field had to be removed. I don't think this should cause a big deal because name is honestly, not a very well used (or documented) field. **This is a breaking change though**. 3. The token that's being passed around now is an async function that either gets the token from the cache, or refreshes it if it's expired. ## Testing 1. Unit tests 2. Sanity tests to make sure we can send messages etc normally. 3. Tested to make sure app token refreshes automatically after an hour 4. Tested user graph tokens 5. Tested app graph tokens #### PR Dependency Tree * **PR #187** 👈 * **PR #191** * **PR #192** * **PR #193** This tree was auto-generated by [Charcoal](https://github.com/danerwilliams/charcoal)
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Adds native support for User Managed Identity via MSAL.
It can be enabled via the environment variable
ENABLE_MANAGED_IDENTITYbeing set to eitheruserorsystem. If it's user, a client_id is required. But system, that is not the case.Tested with UMI.
Pending testing with SysMI.
PR Dependency Tree
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