Remote instance dereferencing (#70)

Remote instances are now dereferenced when they post to an inbox on a GtS instance.

    Dereferencing will be done first by checking the /api/v1/instance endpoint of an instance.
    If that doesn't work, /.well-known/nodeinfo will be checked.
    If that doesn't work, only a minimal representation of the instance will be stored.

A new field was added to the Instance database model. To create it:

alter table instances add column contact_account_username text;

1 files changed, 12 insertions, 0 deletions

diff --git a/internal/transport/dereference.go b/internal/transport/dereference.go
new file mode 100644
index 000000000..d7a28fe17
--- /dev/null
+++ b/internal/transport/dereference.go
@@ -0,0 +1,12 @@
+package transport
+
+import (
+	"context"
+	"net/url"
+)
+
+func (t *transport) Dereference(c context.Context, iri *url.URL) ([]byte, error) {
+	l := t.log.WithField("func", "Dereference")
+	l.Debugf("performing GET to %s", iri.String())
+	return t.sigTransport.Dereference(c, iri)
+}