Due to a bug in Rails, .truncate returns a frozen string if the string actually changed, but not if there are no changes. This leads to inconsistent behaviour, and broken tests.
This was fixed upstream, see https://github.com/rails/rails/pull/36109, but the fix did not make it into 5.2.x, so we have to work around for the time being.
We load another schema, https://diaspora.github.io/diaspora_federation/schemas/federation_entities.json,
that has overlapping definitions, namely #/definitions/post. When the definition from that schema is accessed
first, the json-schema gem caches it and is not smart enough to give precedence to the definition
within the schema document that contains the reference. So for now we have to disambiguate the references
likes this
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.
