// This file is part of the happyDomain (R) project.
// Copyright (c) 2020-2026 happyDomain
// Authors: Pierre-Olivier Mercier, et al.
//
// This program is offered under a commercial and under the AGPL license.
// For commercial licensing, contact us at <contact@happydomain.org>.
//
// For AGPL licensing:
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <https://www.gnu.org/licenses/>.

package checker

import (
	"context"

	sdk "git.happydns.org/checker-sdk-go/checker"
)

// authMethodsRule reports on the authentication methods advertised by
// the server (password exposure, missing public-key support). Only
// active when the auth probe ran.
type authMethodsRule struct{}

func (r *authMethodsRule) Name() string { return "ssh.auth_methods" }
func (r *authMethodsRule) Description() string {
	return "Reviews the advertised authentication methods (password exposure, public-key availability)."
}

func (r *authMethodsRule) Evaluate(ctx context.Context, obs sdk.ObservationGetter, _ sdk.CheckerOptions) []sdk.CheckState {
	data, errSt := loadSSHData(ctx, obs)
	if errSt != nil {
		return []sdk.CheckState{*errSt}
	}
	var probed bool
	var issues []Issue
	for _, ep := range data.Endpoints {
		if !ep.AuthProbeAttempted {
			continue
		}
		probed = true
		issues = append(issues, analyseAuthMethods(ep.Address, &ep)...)
	}
	if !probed {
		return []sdk.CheckState{notTestedState("ssh.auth_methods.skipped", "Authentication-method enumeration disabled or not performed.")}
	}
	if len(issues) == 0 {
		return []sdk.CheckState{passState("ssh.auth_methods.ok", "Authentication method posture looks sound.")}
	}
	return statesFromIssues(issues)
}