Add SAML support

Signed-off-by: Bryan Frimin <bryan@getprobo.com>

pkg/coredata/saml_assertion.go

@@ -0,0 +1,108 @@
+// Copyright (c) 2025 Probo Inc <hello@getprobo.com>.
+//
+// Permission to use, copy, modify, and/or distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice appear in all copies.
+//
+// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
+// REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+// AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
+// INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+// LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
+// OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+// PERFORMANCE OF THIS SOFTWARE.
+
+package coredata
+
+import (
+	"context"
+	"fmt"
+	"time"
+
+	"github.com/getprobo/probo/pkg/gid"
+	"github.com/jackc/pgx/v5"
+	"go.gearno.de/kit/pg"
+)
+
+type SAMLAssertion struct {
+	ID             string    `db:"id"`
+	OrganizationID gid.GID   `db:"organization_id"`
+	UsedAt         time.Time `db:"used_at"`
+	ExpiresAt      time.Time `db:"expires_at"`
+}
+
+type ErrAssertionAlreadyUsed struct {
+	AssertionID string
+}
+
+func (e ErrAssertionAlreadyUsed) Error() string {
+	return fmt.Sprintf("assertion ID %q has already been used (replay attack)", e.AssertionID)
+}
+
+func (s *SAMLAssertion) CheckExists(
+	ctx context.Context,
+	conn pg.Conn,
+	assertionID string,
+) (bool, error) {
+	query := `
+SELECT id
+FROM auth_saml_assertions
+WHERE id = @id
+LIMIT 1
+`
+
+	rows, err := conn.Query(ctx, query, pgx.NamedArgs{"id": assertionID})
+	if err != nil {
+		return false, fmt.Errorf("cannot query saml_assertions: %w", err)
+	}
+
+	_, err = pgx.CollectOneRow(rows, pgx.RowTo[string])
+	if err == nil {
+		return true, nil
+	}
+	if err == pgx.ErrNoRows {
+		return false, nil
+	}
+
+	return false, fmt.Errorf("cannot collect saml_assertion: %w", err)
+}
+
+func (s *SAMLAssertion) Insert(
+	ctx context.Context,
+	conn pg.Conn,
+	scope Scoper,
+) error {
+	query := `
+INSERT INTO auth_saml_assertions (id, tenant_id, organization_id, used_at, expires_at)
+VALUES (@id, @tenant_id, @organization_id, @used_at, @expires_at)
+`
+
+	args := pgx.NamedArgs{
+		"id":              s.ID,
+		"tenant_id":       scope.GetTenantID(),
+		"organization_id": s.OrganizationID,
+		"used_at":         s.UsedAt,
+		"expires_at":      s.ExpiresAt,
+	}
+
+	_, err := conn.Exec(ctx, query, args)
+	if err != nil {
+		return fmt.Errorf("cannot insert saml_assertion: %w", err)
+	}
+
+	return nil
+}
+
+func DeleteExpiredSAMLAssertions(ctx context.Context, conn pg.Conn, now time.Time) (int64, error) {
+	query := `
+DELETE FROM auth_saml_assertions
+WHERE expires_at < @now
+`
+
+	result, err := conn.Exec(ctx, query, pgx.NamedArgs{"now": now})
+	if err != nil {
+		return 0, fmt.Errorf("cannot delete expired saml_assertions: %w", err)
+	}
+
+	return result.RowsAffected(), nil
+}