refs https://github.com/TryGhost/Team/issues/1833
refs https://github.com/TryGhost/Team/issues/1834
We've added the attribution property to subscription and signup events when the
flag is enabled. The attributions resource is fetched by creating multiple relations
on the model, rather than polymorphic as we ran into issues with that as they can't
be nullable/optional.
The parse-member-event structure has been updated to make it easier to work with,
specifically `getObject` is only used when the event is clickable, and there is now a
join property which makes it easier to join the action and the object.
fixes https://github.com/TryGhost/Team/issues/1829
- Remove the subdirectories when creating the Attribution instances
- URLs are now always stored relative to the subdirectory instead of the root directory (makes changing the subdirectory easier)
- Fixed returning absolute urls
- Added tests
refs https://github.com/TryGhost/Team/issues/1808
refs https://github.com/TryGhost/Team/issues/1809
refs https://github.com/TryGhost/Team/issues/1820
refs https://github.com/TryGhost/Team/issues/1814
### Changes in `member-events` package
- Added MemberCreatedEvent (event, not model)
- Added SubscriptionCreatedEvent (event, not model)
### Added `member-attribution` package (new)
- Added the AttributionBuilder class which is able to convert a url history to an attribution object (exposed as getAttribution on the service itself, which handles the dependencies)
```
[{
"path": "/",
"time": 123
}]
```
to
```
{
"url": "/",
"id": null,
"type": "url"
}
```
- event handler listens for MemberCreatedEvent and SubscriptionCreatedEvent and creates the corresponding models in the database.
### Changes in `members-api` package
- Added urlHistory to `sendMagicLink` endpoint body + convert the urlHistory to an attribution object that is stored in the tokenData of the magic link (sent by Portal in this PR: https://github.com/TryGhost/Portal/pull/256).
- Added urlHistory to `createCheckoutSession` endpoint + convert the urlHistory to attribution keys that are saved in the Stripe Session metadata (sent by Portal in this PR: https://github.com/TryGhost/Portal/pull/256).
- Added attribution data property to member repository's create method (when a member is created)
- Dispatch MemberCreatedEvent with attribution
### Changes in `members-stripe-service` package (`ghost/stripe`)
- Dispatch SubscriptionCreatedEvent in WebhookController on subscription checkout (with attribution from session metadata)
