feat: Add ent-based sqlite3 storage

Signed-off-by: m.nabokikh <maksim.nabokikh@flant.com>

storage/ent/client/main.go

@@ -0,0 +1,95 @@
+package client
+
+import (
+	"context"
+	"hash"
+	"time"
+
+	"github.com/dexidp/dex/storage"
+	"github.com/dexidp/dex/storage/ent/db"
+	"github.com/dexidp/dex/storage/ent/db/authcode"
+	"github.com/dexidp/dex/storage/ent/db/authrequest"
+	"github.com/dexidp/dex/storage/ent/db/devicerequest"
+	"github.com/dexidp/dex/storage/ent/db/devicetoken"
+	"github.com/dexidp/dex/storage/ent/db/migrate"
+)
+
+var _ storage.Storage = (*Database)(nil)
+
+type Database struct {
+	client *db.Client
+	hasher func() hash.Hash
+}
+
+// NewDatabase returns new database client with set options.
+func NewDatabase(opts ...func(*Database)) *Database {
+	database := &Database{}
+	for _, f := range opts {
+		f(database)
+	}
+	return database
+}
+
+// WithClient sets client option of a Database object.
+func WithClient(c *db.Client) func(*Database) {
+	return func(s *Database) {
+		s.client = c
+	}
+}
+
+// WithHasher sets client option of a Database object.
+func WithHasher(h func() hash.Hash) func(*Database) {
+	return func(s *Database) {
+		s.hasher = h
+	}
+}
+
+// Schema exposes migration schema to perform migrations.
+func (d *Database) Schema() *migrate.Schema {
+	return d.client.Schema
+}
+
+// Close calls the corresponding method of the ent database client.
+func (d *Database) Close() error {
+	return d.client.Close()
+}
+
+// GarbageCollect removes expired entities from the database.
+func (d *Database) GarbageCollect(now time.Time) (storage.GCResult, error) {
+	result := storage.GCResult{}
+	utcNow := now.UTC()
+
+	q, err := d.client.AuthRequest.Delete().
+		Where(authrequest.ExpiryLT(utcNow)).
+		Exec(context.TODO())
+	if err != nil {
+		return result, convertDBError("gc auth request: %w", err)
+	}
+	result.AuthRequests = int64(q)
+
+	q, err = d.client.AuthCode.Delete().
+		Where(authcode.ExpiryLT(utcNow)).
+		Exec(context.TODO())
+	if err != nil {
+		return result, convertDBError("gc auth code: %w", err)
+	}
+	result.AuthCodes = int64(q)
+
+	q, err = d.client.DeviceRequest.Delete().
+		Where(devicerequest.ExpiryLT(utcNow)).
+		Exec(context.TODO())
+	if err != nil {
+		return result, convertDBError("gc device request: %w", err)
+	}
+	result.DeviceRequests = int64(q)
+
+	q, err = d.client.DeviceToken.Delete().
+		Where(devicetoken.ExpiryLT(utcNow)).
+		Exec(context.TODO())
+	if err != nil {
+		return result, convertDBError("gc device token: %w", err)
+	}
+	result.DeviceTokens = int64(q)
+
+	return result, err
+}