This implements archive import feature.
The feature is divided in two main subfeatures: archive validation and archive import.
Archive validation performs different validation on input user archive. This can be
used without actually running import, e.g. when user wants to check the archive
before import from the frontend. Validators may add messages and modify the archive.
Validators are separated in two types: critical validators and non-critical validators.
If validations by critical validators fail it means we can't import archive.
If non-critical validations fail, we can import archive, but some warning messages
are rendered.
Also validators may change archive contents, e.g. when some entity can't be
imported it may be removed from the archive.
Validators' job is to take away complexity from the importer and perform the validations
which are not implemented in other parts of the system, e.g. DB validations or
diaspora_federation entity validations.
Archive importer then takes the modified archive from the validator and imports it.
In order to incapsulate high-level migration logic a MigrationService is
introduced. MigrationService links ArchiveValidator, ArchiveImporter and
AccountMigration.
Also here is introduced a rake task which may be used by podmins to run archive
import.
When people only write `https://` as image URL, this would fail with
`Addressable::URI::InvalidURIError: Absolute URI missing hierarchical segment: 'https://'`.
closes#7922
This is to let the author of the post know, that this pod is interested
in updates about this post.
The sending user is only used to verify that the participation was sent
from this pod, but lets use an admin/podmin account if available.
closes#7708
This uses a lot of memory for big accounts. Also it doesn't make much
sense to rollback everything when something fails, it's better to delete
everything we can.
- Removed posts and non contacts from other's data
- Collections are exported in batches to lower memory footprint
- In base exporters create User object instead of keeping instance because it caches all associations
closes#7627
