12304289958

Committed 12 Dec 2024 08:30PM UTC coverage: 73.933% (-0.5%) from 74.39%

Build Type

push

github

Committed by Ayushi Sharma

Commit Message

fix: update oss client caching logic

Run Details

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76.48

/core/appeal/service.go

package appeal

import (
        "context"
        "encoding/json"
        "errors"
        "fmt"
        "io"
        "reflect"
        "strings"
        "sync"
        "time"

        "github.com/go-playground/validator/v10"
        "github.com/goto/guardian/core/comment"
        "github.com/goto/guardian/core/event"
        "github.com/goto/guardian/core/grant"
        "github.com/goto/guardian/core/policy"
        "github.com/goto/guardian/domain"
        "github.com/goto/guardian/pkg/evaluator"
        "github.com/goto/guardian/pkg/http"
        "github.com/goto/guardian/pkg/log"
        "github.com/goto/guardian/plugins/notifiers"
        "github.com/goto/guardian/utils"
        "github.com/mitchellh/mapstructure"
        "golang.org/x/sync/errgroup"
)

const (
        AuditKeyBulkInsert     = "appeal.bulkInsert"
        AuditKeyUpdate         = "appeal.update"
        AuditKeyCancel         = "appeal.cancel"
        AuditKeyApprove        = "appeal.approve"
        AuditKeyReject         = "appeal.reject"
        AuditKeyRevoke         = "appeal.revoke"
        AuditKeyExtend         = "appeal.extend"
        AuditKeyAddApprover    = "appeal.addApprover"
        AuditKeyDeleteApprover = "appeal.deleteApprover"

        RevokeReasonForExtension = "Automatically revoked for grant extension"
        RevokeReasonForOverride  = "Automatically revoked for grant override"
)

var TimeNow = time.Now

//go:generate mockery --name=repository --exported --with-expecter
type repository interface {
        BulkUpsert(context.Context, []*domain.Appeal) error
        Find(context.Context, *domain.ListAppealsFilter) ([]*domain.Appeal, error)
        GetByID(ctx context.Context, id string) (*domain.Appeal, error)
        UpdateByID(context.Context, *domain.Appeal) error
        Update(context.Context, *domain.Appeal) error
        GetAppealsTotalCount(context.Context, *domain.ListAppealsFilter) (int64, error)
}

//go:generate mockery --name=iamManager --exported --with-expecter
type iamManager interface {
        domain.IAMManager
}

//go:generate mockery --name=notifier --exported --with-expecter
type notifier interface {
        notifiers.Client
}

//go:generate mockery --name=policyService --exported --with-expecter
type policyService interface {
        Find(context.Context) ([]*domain.Policy, error)
        GetOne(context.Context, string, uint) (*domain.Policy, error)
}

//go:generate mockery --name=approvalService --exported --with-expecter
type approvalService interface {
        AddApprover(ctx context.Context, approvalID, email string) error
        DeleteApprover(ctx context.Context, approvalID, email string) error
}

//go:generate mockery --name=providerService --exported --with-expecter
type providerService interface {
        Find(context.Context) ([]*domain.Provider, error)
        GrantAccess(context.Context, domain.Grant) error
        RevokeAccess(context.Context, domain.Grant) error
        ValidateAppeal(context.Context, *domain.Appeal, *domain.Provider, *domain.Policy) error
        GetPermissions(context.Context, *domain.ProviderConfig, string, string) ([]interface{}, error)
        IsExclusiveRoleAssignment(context.Context, string, string) bool
        GetDependencyGrants(context.Context, domain.Grant) ([]*domain.Grant, error)
}

//go:generate mockery --name=resourceService --exported --with-expecter
type resourceService interface {
        Find(context.Context, domain.ListResourcesFilter) ([]*domain.Resource, error)
        Get(context.Context, *domain.ResourceIdentifier) (*domain.Resource, error)
}

//go:generate mockery --name=grantService --exported --with-expecter
type grantService interface {
        List(context.Context, domain.ListGrantsFilter) ([]domain.Grant, error)
        Prepare(context.Context, domain.Appeal) (*domain.Grant, error)
        Revoke(ctx context.Context, id, actor, reason string, opts ...grant.Option) (*domain.Grant, error)
        Create(ctx context.Context, grant *domain.Grant) error
}

//go:generate mockery --name=auditLogger --exported --with-expecter
type auditLogger interface {
        Log(ctx context.Context, action string, data interface{}) error
}

type CreateAppealOption func(*createAppealOptions)

type createAppealOptions struct {
        IsAdditionalAppeal bool
}

func CreateWithAdditionalAppeal() CreateAppealOption {
        return func(opts *createAppealOptions) {
                opts.IsAdditionalAppeal = true
        }
}

type ServiceDeps struct {
        Repository      repository
        ApprovalService approvalService
        ResourceService resourceService
        ProviderService providerService
        PolicyService   policyService
        GrantService    grantService
        CommentService  *comment.Service
        EventService    *event.Service
        IAMManager      iamManager

        Notifier    notifier
        Validator   *validator.Validate
        Logger      log.Logger
        AuditLogger auditLogger
}

// Service handling the business logics
type Service struct {
        repo            repository
        approvalService approvalService
        resourceService resourceService
        providerService providerService
        policyService   policyService
        grantService    grantService
        commentService  *comment.Service
        eventService    *event.Service
        iam             domain.IAMManager

        notifier    notifier
        validator   *validator.Validate
        logger      log.Logger
        auditLogger auditLogger

        TimeNow func() time.Time
}

// NewService returns service struct
func NewService(deps ServiceDeps) *Service {
        return &Service{
                deps.Repository,
                deps.ApprovalService,
                deps.ResourceService,
                deps.ProviderService,
                deps.PolicyService,
                deps.GrantService,
                deps.CommentService,
                deps.EventService,
                deps.IAMManager,

                deps.Notifier,
                deps.Validator,
                deps.Logger,
                deps.AuditLogger,
                time.Now,
        }
}

// GetByID returns one record by id
func (s *Service) GetByID(ctx context.Context, id string) (*domain.Appeal, error) {
        if id == "" {
                return nil, ErrAppealIDEmptyParam
        }

        if !utils.IsValidUUID(id) {
                return nil, InvalidError{AppealID: id}
        }

        return s.repo.GetByID(ctx, id)
}

// Find appeals by filters
func (s *Service) Find(ctx context.Context, filters *domain.ListAppealsFilter) ([]*domain.Appeal, error) {
        return s.repo.Find(ctx, filters)
}

// Create record
func (s *Service) Create(ctx context.Context, appeals []*domain.Appeal, opts ...CreateAppealOption) error {
        createAppealOpts := &createAppealOptions{}
        for _, opt := range opts {
                opt(createAppealOpts)
        }
        isAdditionalAppealCreation := createAppealOpts.IsAdditionalAppeal

        resourceIDs := []string{}
        accountIDs := []string{}
        for _, a := range appeals {
                resourceIDs = append(resourceIDs, a.ResourceID)
                accountIDs = append(accountIDs, a.AccountID)
        }

        eg, egctx := errgroup.WithContext(ctx)
        var (
                resources      map[string]*domain.Resource
                providers      map[string]map[string]*domain.Provider
                policies       map[string]map[uint]*domain.Policy
                pendingAppeals map[string]map[string]map[string]*domain.Appeal
        )

        eg.Go(func() error {
                resourcesData, err := s.getResourcesMap(egctx, resourceIDs)
                if err != nil {
                        return fmt.Errorf("error getting resource map: %w", err)
                }
                resources = resourcesData
                return nil
        })

        eg.Go(func() error {
                providersData, err := s.getProvidersMap(egctx)
                if err != nil {
                        return fmt.Errorf("error getting providers map: %w", err)
                }
                providers = providersData
                return nil
        })

        eg.Go(func() error {
                policiesData, err := s.getPoliciesMap(egctx)
                if err != nil {
                        return fmt.Errorf("error getting policies map: %w", err)
                }
                policies = policiesData
                return nil
        })

        eg.Go(func() error {
                pendingAppealsData, err := s.getAppealsMap(egctx, &domain.ListAppealsFilter{
                        Statuses:   []string{domain.AppealStatusPending},
                        AccountIDs: accountIDs,
                })
                if err != nil {
                        return fmt.Errorf("listing pending appeals: %w", err)
                }
                pendingAppeals = pendingAppealsData
                return nil
        })

        if err := eg.Wait(); err != nil {
                return err
        }

        notifications := []domain.Notification{}

        for _, appeal := range appeals {
                appeal.SetDefaults()

                if err := validateAppeal(appeal, pendingAppeals); err != nil {
                        return err
                }
                if err := addResource(appeal, resources); err != nil {
                        return fmt.Errorf("couldn't find resource with id %q: %w", appeal.ResourceID, err)
                }
                provider, err := getProvider(appeal, providers)
                if err != nil {
                        return err
                }

                var policy *domain.Policy
                if isAdditionalAppealCreation && appeal.PolicyID != "" && appeal.PolicyVersion != 0 {
                        policy = policies[appeal.PolicyID][appeal.PolicyVersion]
                } else {
                        policy, err = getPolicy(appeal, provider, policies)
                        if err != nil {
                                return err
                        }
                }

                activeGrant, err := s.findActiveGrant(ctx, appeal)
                if err != nil && err != ErrGrantNotFound {
                        return err
                }

                if activeGrant != nil {
                        if err := s.checkExtensionEligibility(appeal, provider, policy, activeGrant); err != nil {
                                return err
                        }
                }

                if err := s.providerService.ValidateAppeal(ctx, appeal, provider, policy); err != nil {
                        return fmt.Errorf("provider validation: %w", err)
                }

                strPermissions, err := s.getPermissions(ctx, provider.Config, appeal.Resource.Type, appeal.Role)
                if err != nil {
                        return fmt.Errorf("getting permissions list: %w", err)
                }
                appeal.Permissions = strPermissions

                if err := validateAppealDurationConfig(appeal, policy); err != nil {
                        return err
                }

                if err := validateAppealOnBehalf(appeal, policy); err != nil {
                        return err
                }

                if err := s.addCreatorDetails(ctx, appeal, policy); err != nil {
                        return fmt.Errorf("getting creator details: %w", err)
                }

                if err := s.populateAppealMetadata(ctx, appeal, policy); err != nil {
                        return fmt.Errorf("getting appeal metadata: %w", err)
                }

                appeal.Revision = 0
                if err := appeal.ApplyPolicy(policy); err != nil {
                        return err
                }

                if err := appeal.AdvanceApproval(policy); err != nil {
                        return fmt.Errorf("initializing approvals: %w", err)
                }
                appeal.Policy = nil

                for _, approval := range appeal.Approvals {
                        // TODO: direcly check on appeal.Status==domain.AppealStatusApproved instead of manual looping through approvals
                        if approval.Index == len(appeal.Approvals)-1 && (approval.Status == domain.ApprovalStatusApproved || appeal.Status == domain.AppealStatusApproved) {
                                newGrant, prevGrant, err := s.prepareGrant(ctx, appeal)
                                if err != nil {
                                        return fmt.Errorf("preparing grant: %w", err)
                                }
                                newGrant.Resource = appeal.Resource
                                appeal.Grant = newGrant
                                if prevGrant != nil {
                                        if _, err := s.grantService.Revoke(ctx, prevGrant.ID, domain.SystemActorName, prevGrant.RevokeReason,
                                                grant.SkipNotifications(),
                                                grant.SkipRevokeAccessInProvider(),
                                        ); err != nil {
                                                return fmt.Errorf("revoking previous grant: %w", err)
                                        }
                                }

                                if err := s.GrantAccessToProvider(ctx, appeal, opts...); err != nil {
                                        return fmt.Errorf("granting access: %w", err)
                                }

                                notifications = append(notifications, domain.Notification{
                                        User: appeal.CreatedBy,
                                        Labels: map[string]string{
                                                "appeal_id": appeal.ID,
                                        },
                                        Message: domain.NotificationMessage{
                                                Type: domain.NotificationTypeAppealApproved,
                                                Variables: map[string]interface{}{
                                                        "resource_name": fmt.Sprintf("%s (%s: %s)", appeal.Resource.Name, appeal.Resource.ProviderType, appeal.Resource.URN),
                                                        "role":          appeal.Role,
                                                        "account_id":    appeal.AccountID,
                                                        "appeal_id":     appeal.ID,
                                                        "requestor":     appeal.CreatedBy,
                                                },
                                        },
                                })

                                notifications = addOnBehalfApprovedNotification(appeal, notifications)
                        }
                }
        }

        if err := s.repo.BulkUpsert(ctx, appeals); err != nil {
                return fmt.Errorf("inserting appeals into db: %w", err)
        }

        go func() {
                ctx := context.WithoutCancel(ctx)
                if err := s.auditLogger.Log(ctx, AuditKeyBulkInsert, appeals); err != nil {
                        s.logger.Error(ctx, "failed to record audit log", "error", err)
                }
        }()

        for _, a := range appeals {
                if a.Status == domain.AppealStatusRejected {
                        var reason string
                        for _, approval := range a.Approvals {
                                if approval.Status == domain.ApprovalStatusRejected {
                                        reason = approval.Reason
                                        break
                                }
                        }

                        notifications = append(notifications, domain.Notification{
                                User: a.CreatedBy,
                                Labels: map[string]string{
                                        "appeal_id": a.ID,
                                },
                                Message: domain.NotificationMessage{
                                        Type: domain.NotificationTypeAppealRejected,
                                        Variables: map[string]interface{}{
                                                "resource_name": fmt.Sprintf("%s (%s: %s)", a.Resource.Name, a.Resource.ProviderType, a.Resource.URN),
                                                "role":          a.Role,
                                                "account_id":    a.AccountID,
                                                "appeal_id":     a.ID,
                                                "requestor":     a.CreatedBy,
                                                "reason":        reason,
                                        },
                                },
                        })
                }

                notifications = append(notifications, s.getApprovalNotifications(ctx, a)...)
        }

        if len(notifications) > 0 {
                go func() {
                        ctx := context.WithoutCancel(ctx)
                        if errs := s.notifier.Notify(ctx, notifications); errs != nil {
                                for _, err1 := range errs {
                                        s.logger.Error(ctx, "failed to send notifications", "error", err1.Error())
                                }
                        }
                }()
        }

        return nil
}

func (s *Service) findActiveGrant(ctx context.Context, a *domain.Appeal) (*domain.Grant, error) {
        grants, err := s.grantService.List(ctx, domain.ListGrantsFilter{
                Statuses:    []string{string(domain.GrantStatusActive)},
                AccountIDs:  []string{a.AccountID},
                ResourceIDs: []string{a.ResourceID},
                Roles:       []string{a.Role},
                OrderBy:     []string{"updated_at:desc"},
        })

        if err != nil {
                return nil, fmt.Errorf("listing active grants: %w", err)
        }

        if len(grants) == 0 {
                return nil, ErrGrantNotFound
        }

        return &grants[0], nil
}

func addOnBehalfApprovedNotification(appeal *domain.Appeal, notifications []domain.Notification) []domain.Notification {
        if appeal.AccountType == domain.DefaultAppealAccountType && appeal.AccountID != appeal.CreatedBy {
                notifications = append(notifications, domain.Notification{
                        User: appeal.AccountID,
                        Labels: map[string]string{
                                "appeal_id": appeal.ID,
                        },
                        Message: domain.NotificationMessage{
                                Type: domain.NotificationTypeOnBehalfAppealApproved,
                                Variables: map[string]interface{}{
                                        "appeal_id":     appeal.ID,
                                        "resource_name": fmt.Sprintf("%s (%s: %s)", appeal.Resource.Name, appeal.Resource.ProviderType, appeal.Resource.URN),
                                        "role":          appeal.Role,
                                        "account_id":    appeal.AccountID,
                                        "requestor":     appeal.CreatedBy,
                                },
                        },
                })
        }
        return notifications
}

func validateAppealDurationConfig(appeal *domain.Appeal, policy *domain.Policy) error {
        // return nil if duration options are not configured for this policy
        if policy.AppealConfig == nil || policy.AppealConfig.DurationOptions == nil {
                return nil
        }
        for _, durationOption := range policy.AppealConfig.DurationOptions {
                if appeal.Options.Duration == durationOption.Value {
                        return nil
                }
        }

        return fmt.Errorf("invalid duration: %w: %q", ErrDurationNotAllowed, appeal.Options.Duration)
}

func validateAppealOnBehalf(a *domain.Appeal, policy *domain.Policy) error {
        if a.AccountType == domain.DefaultAppealAccountType {
                if policy.AppealConfig != nil && policy.AppealConfig.AllowOnBehalf {
                        return nil
                }
                if a.AccountID != a.CreatedBy {
                        return ErrCannotCreateAppealForOtherUser
                }
        }
        return nil
}

// Patch record
func (s *Service) Patch(ctx context.Context, appeal *domain.Appeal) error {
        existingAppeal, err := s.GetByID(ctx, appeal.ID)
        if err != nil {
                return fmt.Errorf("error getting existing appeal: %w", err)
        }

        if existingAppeal.Status != domain.AppealStatusPending {
                return fmt.Errorf("%w: unable to edit appeal in status: %q", ErrAppealStatusInvalid, existingAppeal.Status)
        }

        isAppealUpdated, err := validatePatchReq(appeal, existingAppeal)
        if err != nil {
                return err
        }

        if !isAppealUpdated {
                return ErrNoChanges
        }

        eg, egctx := errgroup.WithContext(ctx)
        var (
                providers      map[string]map[string]*domain.Provider
                policies       map[string]map[uint]*domain.Policy
                pendingAppeals map[string]map[string]map[string]*domain.Appeal
        )

        eg.Go(func() error {
                if appeal.Resource == nil {
                        resource, err := s.resourceService.Get(egctx, &domain.ResourceIdentifier{ID: appeal.ResourceID})
                        if err != nil {
                                return fmt.Errorf("error getting resource: %w", err)
                        }
                        appeal.Resource = resource
                }
                return nil
        })

        eg.Go(func() error {
                providersData, err := s.getProvidersMap(egctx)
                if err != nil {
                        return fmt.Errorf("error getting providers map: %w", err)
                }
                providers = providersData
                return nil
        })

        eg.Go(func() error {
                policiesData, err := s.getPoliciesMap(egctx)
                if err != nil {
                        return fmt.Errorf("error getting policies map: %w", err)
                }
                policies = policiesData
                return nil
        })

        eg.Go(func() error {
                pendingAppealsData, err := s.getAppealsMap(egctx, &domain.ListAppealsFilter{
                        Statuses:   []string{domain.AppealStatusPending},
                        AccountIDs: []string{appeal.AccountID},
                })
                if err != nil {
                        return fmt.Errorf("error while listing pending appeals: %w", err)
                }
                pendingAppeals = pendingAppealsData
                return nil
        })

        if err := eg.Wait(); err != nil {
                return err
        }

        appeal.SetDefaults()

        if appeal.AccountID != existingAppeal.AccountID || appeal.ResourceID != existingAppeal.ResourceID || appeal.Role != existingAppeal.Role {
                if err := validateAppeal(appeal, pendingAppeals); err != nil {
                        return err
                }
        }

        provider, err := getProvider(appeal, providers)
        if err != nil {
                return err
        }

        policy, err := getPolicy(appeal, provider, policies)
        if err != nil {
                return err
        }

        activeGrant, err := s.findActiveGrant(ctx, appeal)
        if err != nil && err != ErrGrantNotFound {
                return err
        }

        if activeGrant != nil {
                if err := s.checkExtensionEligibility(appeal, provider, policy, activeGrant); err != nil {
                        return err
                }
        }

        if err := s.providerService.ValidateAppeal(ctx, appeal, provider, policy); err != nil {
                return fmt.Errorf("provider validation: %w", err)
        }

        strPermissions, err := s.getPermissions(ctx, provider.Config, appeal.Resource.Type, appeal.Role)
        if err != nil {
                return fmt.Errorf("getting permissions list: %w", err)
        }
        appeal.Permissions = strPermissions

        if err := validateAppealDurationConfig(appeal, policy); err != nil {
                return err
        }

        if err := validateAppealOnBehalf(appeal, policy); err != nil {
                return err
        }

        if err := s.populateAppealMetadata(ctx, appeal, policy); err != nil {
                return fmt.Errorf("getting appeal metadata: %w", err)
        }

        if err := s.addCreatorDetails(ctx, appeal, policy); err != nil {
                return fmt.Errorf("getting creator details: %w", err)
        }

        // create new approval
        appeal.Revision = existingAppeal.Revision + 1
        if err := appeal.ApplyPolicy(policy); err != nil {
                return err
        }

        if err := appeal.AdvanceApproval(policy); err != nil {
                return fmt.Errorf("initializing approvals: %w", err)
        }
        appeal.Policy = nil

        notifications := []domain.Notification{}
        for _, approval := range appeal.Approvals {
                if approval.Index == len(appeal.Approvals)-1 && (approval.Status == domain.ApprovalStatusApproved || appeal.Status == domain.AppealStatusApproved) {
                        newGrant, revokedGrant, err := s.prepareGrant(ctx, appeal)
                        if err != nil {
                                return fmt.Errorf("preparing grant: %w", err)
                        }
                        newGrant.Resource = appeal.Resource
                        appeal.Grant = newGrant
                        if revokedGrant != nil {
                                if _, err := s.grantService.Revoke(ctx, revokedGrant.ID, domain.SystemActorName, revokedGrant.RevokeReason,
                                        grant.SkipNotifications(),
                                        grant.SkipRevokeAccessInProvider(),
                                ); err != nil {
                                        return fmt.Errorf("revoking previous grant: %w", err)
                                }
                        } else {
                                if err := s.GrantAccessToProvider(ctx, appeal); err != nil {
                                        return fmt.Errorf("granting access: %w", err)
                                }
                        }

                        notifications = append(notifications, domain.Notification{
                                User: appeal.CreatedBy,
                                Labels: map[string]string{
                                        "appeal_id": appeal.ID,
                                },
                                Message: domain.NotificationMessage{
                                        Type: domain.NotificationTypeAppealApproved,
                                        Variables: map[string]interface{}{
                                                "resource_name": fmt.Sprintf("%s (%s: %s)", appeal.Resource.Name, appeal.Resource.ProviderType, appeal.Resource.URN),
                                                "role":          appeal.Role,
                                                "account_id":    appeal.AccountID,
                                                "appeal_id":     appeal.ID,
                                                "requestor":     appeal.CreatedBy,
                                        },
                                },
                        })

                        notifications = addOnBehalfApprovedNotification(appeal, notifications)
                }
        }

        newApprovals := appeal.Approvals

        // mark previous approvals as stale
        for _, approval := range existingAppeal.Approvals {
                approval.IsStale = true

                // clear approvers so it won't get inserted to db
                // TODO: change Approvers type to Approver[] instead of string[] to keep each ID
                approval.Approvers = []string{}

                appeal.Approvals = append(appeal.Approvals, approval)
        }

        if err := s.repo.UpdateByID(ctx, appeal); err != nil {
                return fmt.Errorf("error saving appeal to db: %w", err)
        }

        diff, err := appeal.Compare(existingAppeal, appeal.CreatedBy)
        if err != nil {
                return fmt.Errorf("error comparing appeals: %w", err)
        }

        auditLog := map[string]interface{}{
                "appeal_id": appeal.ID,
                "revision":  appeal.Revision,
                "diff":      diff,
        }
        go func() {
                ctx := context.WithoutCancel(ctx)
                if err := s.auditLogger.Log(ctx, AuditKeyUpdate, auditLog); err != nil {
                        s.logger.Error(ctx, "failed to record audit log", "error", err)
                }
        }()

        appeal.Approvals = newApprovals
        if appeal.Status == domain.AppealStatusApproved {
                notifications = append(notifications, domain.Notification{
                        User: appeal.CreatedBy,
                        Labels: map[string]string{
                                "appeal_id": appeal.ID,
                        },
                        Message: domain.NotificationMessage{
                                Type: domain.NotificationTypeAppealApproved,
                                Variables: map[string]interface{}{
                                        "resource_name": fmt.Sprintf("%s (%s: %s)", appeal.Resource.Name, appeal.Resource.ProviderType, appeal.Resource.URN),
                                        "role":          appeal.Role,
                                        "account_id":    appeal.AccountID,
                                        "appeal_id":     appeal.ID,
                                        "requestor":     appeal.CreatedBy,
                                },
                        },
                })
                notifications = addOnBehalfApprovedNotification(appeal, notifications)
        } else if appeal.Status == domain.AppealStatusRejected {
                var reason string
                for _, approval := range appeal.Approvals {
                        if approval.Status == domain.ApprovalStatusRejected {
                                reason = approval.Reason
                                break
                        }
                }
                notifications = append(notifications, domain.Notification{
                        User: appeal.CreatedBy,
                        Labels: map[string]string{
                                "appeal_id": appeal.ID,
                        },
                        Message: domain.NotificationMessage{
                                Type: domain.NotificationTypeAppealRejected,
                                Variables: map[string]interface{}{
                                        "resource_name": fmt.Sprintf("%s (%s: %s)", appeal.Resource.Name, appeal.Resource.ProviderType, appeal.Resource.URN),
                                        "role":          appeal.Role,
                                        "account_id":    appeal.AccountID,
                                        "appeal_id":     appeal.ID,
                                        "requestor":     appeal.CreatedBy,
                                        "reason":        reason,
                                },
                        },
                })
        } else {
                notifications = append(notifications, s.getApprovalNotifications(ctx, appeal)...)
        }

        if len(notifications) > 0 {
                go func() {
                        ctx := context.WithoutCancel(ctx)
                        if errs := s.notifier.Notify(ctx, notifications); errs != nil {
                                for _, err1 := range errs {
                                        s.logger.Error(ctx, "failed to send notifications", "error", err1.Error())
                                }
                        }
                }()
        }

        return nil
}

func validatePatchReq(appeal, existingAppeal *domain.Appeal) (bool, error) {
        var isAppealUpdated bool

        updateField := func(newVal, existingVal string) string {
                if newVal == "" || newVal == existingVal {
                        return existingVal
                }
                isAppealUpdated = true
                return newVal
        }

        appeal.AccountID = updateField(appeal.AccountID, existingAppeal.AccountID)
        appeal.AccountType = updateField(appeal.AccountType, existingAppeal.AccountType)
        appeal.Description = updateField(appeal.Description, existingAppeal.Description)
        appeal.Role = updateField(appeal.Role, existingAppeal.Role)
        appeal.ResourceID = updateField(appeal.ResourceID, existingAppeal.ResourceID)
        if appeal.ResourceID == existingAppeal.ResourceID {
                appeal.Resource = existingAppeal.Resource
        }

        if appeal.Options == nil || reflect.DeepEqual(appeal.Options, existingAppeal.Options) {
                appeal.Options = existingAppeal.Options
        } else {
                isAppealUpdated = true
        }

        if appeal.Details == nil || reflect.DeepEqual(appeal.Details, existingAppeal.Details) {
                appeal.Details = existingAppeal.Details
        } else {
                for key, value := range appeal.Details {
                        if existingValue, found := existingAppeal.Details[key]; !found || !reflect.DeepEqual(existingValue, value) {
                                isAppealUpdated = true
                        }
                }
        }

        if appeal.Labels == nil || reflect.DeepEqual(appeal.Labels, existingAppeal.Labels) {
                appeal.Labels = existingAppeal.Labels
        } else {
                isAppealUpdated = true
        }

        appeal.CreatedBy = updateField(appeal.CreatedBy, existingAppeal.CreatedBy)
        if appeal.CreatedBy != existingAppeal.CreatedBy {
                return false, fmt.Errorf("not allowed to update creator")
        }

        appeal.Creator = existingAppeal.Creator
        appeal.Status = existingAppeal.Status

        return isAppealUpdated, nil
}

// UpdateApproval Approve an approval step
func (s *Service) UpdateApproval(ctx context.Context, approvalAction domain.ApprovalAction) (*domain.Appeal, error) {
        if err := approvalAction.Validate(); err != nil {
                return nil, fmt.Errorf("%w: %v", ErrInvalidUpdateApprovalParameter, err)
        }

        appeal, err := s.GetByID(ctx, approvalAction.AppealID)
        if err != nil {
                if errors.Is(err, ErrAppealNotFound) {
                        return nil, fmt.Errorf("%w: %q", ErrAppealNotFound, approvalAction.AppealID)
                }
                return nil, err
        }

        if err := checkIfAppealStatusStillPending(appeal.Status); err != nil {
                return nil, err
        }

        currentApproval := appeal.GetApproval(approvalAction.ApprovalName)
        if currentApproval == nil {
                return nil, fmt.Errorf("%w: %q", ErrApprovalNotFound, approvalAction.ApprovalName)
        }

        // validate previous approvals status
        for i := 0; i < currentApproval.Index; i++ {
                prevApproval := appeal.GetApprovalByIndex(i)
                if prevApproval == nil {
                        return nil, fmt.Errorf("unable to find approval with index %d", i)
                }
                if err := checkPreviousApprovalStatus(prevApproval.Status, prevApproval.Name); err != nil {
                        return nil, err
                }
        }

        // validate current approval status
        if err := checkApprovalStatus(currentApproval.Status); err != nil {
                return nil, err
        }
        if !currentApproval.IsExistingApprover(approvalAction.Actor) {
                return nil, ErrActionForbidden
        }

        // update approval
        currentApproval.Actor = &approvalAction.Actor
        currentApproval.Reason = approvalAction.Reason
        currentApproval.UpdatedAt = TimeNow()
        if approvalAction.Action == domain.AppealActionNameApprove {
                if appeal.Policy == nil {
                        appeal.Policy, err = s.policyService.GetOne(ctx, appeal.PolicyID, appeal.PolicyVersion)
                        if err != nil {
                                return nil, err
                        }
                }

                policyStep := appeal.Policy.GetStepByName(currentApproval.Name)
                if policyStep == nil {
                        return nil, fmt.Errorf("%w: %q for appeal %q", ErrNoPolicyStepFound, approvalAction.ApprovalName, appeal.ID)
                }

                // check if user is self approving the appeal
                if policyStep.DontAllowSelfApproval {
                        if approvalAction.Actor == appeal.CreatedBy {
                                return nil, ErrSelfApprovalNotAllowed
                        }
                }

                currentApproval.Approve()

                // mark next approval as pending
                nextApproval := appeal.GetApprovalByIndex(currentApproval.Index + 1)
                if nextApproval != nil {
                        nextApproval.Status = domain.ApprovalStatusPending
                }

                if err := appeal.AdvanceApproval(appeal.Policy); err != nil {
                        return nil, err
                }
        } else if approvalAction.Action == domain.AppealActionNameReject {
                currentApproval.Reject()
                appeal.Reject()

                // mark the rest of approvals as skipped
                i := currentApproval.Index
                for {
                        nextApproval := appeal.GetApprovalByIndex(i + 1)
                        if nextApproval == nil {
                                break
                        }
                        nextApproval.Skip()
                        nextApproval.UpdatedAt = TimeNow()
                        i++
                }
        } else {
                return nil, ErrActionInvalidValue
        }

        // evaluate final appeal status
        if appeal.Status == domain.AppealStatusApproved {
                newGrant, prevGrant, err := s.prepareGrant(ctx, appeal)
                if err != nil {
                        return nil, fmt.Errorf("preparing grant: %w", err)
                }
                newGrant.Resource = appeal.Resource
                appeal.Grant = newGrant
                if prevGrant != nil {
                        if _, err := s.grantService.Revoke(ctx, prevGrant.ID, domain.SystemActorName, prevGrant.RevokeReason,
                                grant.SkipNotifications(),
                                grant.SkipRevokeAccessInProvider(),
                        ); err != nil {
                                return nil, fmt.Errorf("revoking previous grant: %w", err)
                        }
                }

                if err := s.GrantAccessToProvider(ctx, appeal); err != nil {
                        return nil, fmt.Errorf("granting access: %w", err)
                }
        }

        if err := s.Update(ctx, appeal); err != nil {
                if !errors.Is(err, domain.ErrDuplicateActiveGrant) {
                        if err := s.providerService.RevokeAccess(ctx, *appeal.Grant); err != nil {
                                return nil, fmt.Errorf("revoking access: %w", err)
                        }
                }
                return nil, fmt.Errorf("updating appeal: %w", err)
        }

        notifications := []domain.Notification{}
        if appeal.Status == domain.AppealStatusApproved {
                notifications = append(notifications, domain.Notification{
                        User: appeal.CreatedBy,
                        Labels: map[string]string{
                                "appeal_id": appeal.ID,
                        },
                        Message: domain.NotificationMessage{
                                Type: domain.NotificationTypeAppealApproved,
                                Variables: map[string]interface{}{
                                        "resource_name": fmt.Sprintf("%s (%s: %s)", appeal.Resource.Name, appeal.Resource.ProviderType, appeal.Resource.URN),
                                        "role":          appeal.Role,
                                        "account_id":    appeal.AccountID,
                                        "appeal_id":     appeal.ID,
                                        "requestor":     appeal.CreatedBy,
                                },
                        },
                })
                notifications = addOnBehalfApprovedNotification(appeal, notifications)
        } else if appeal.Status == domain.AppealStatusRejected {
                notifications = append(notifications, domain.Notification{
                        User: appeal.CreatedBy,
                        Labels: map[string]string{
                                "appeal_id": appeal.ID,
                        },
                        Message: domain.NotificationMessage{
                                Type: domain.NotificationTypeAppealRejected,
                                Variables: map[string]interface{}{
                                        "resource_name": fmt.Sprintf("%s (%s: %s)", appeal.Resource.Name, appeal.Resource.ProviderType, appeal.Resource.URN),
                                        "role":          appeal.Role,
                                        "account_id":    appeal.AccountID,
                                        "appeal_id":     appeal.ID,
                                        "requestor":     appeal.CreatedBy,
                                },
                        },
                })
        } else {
                notifications = append(notifications, s.getApprovalNotifications(ctx, appeal)...)
        }
        if len(notifications) > 0 {
                go func() {
                        ctx := context.WithoutCancel(ctx)
                        if errs := s.notifier.Notify(ctx, notifications); errs != nil {
                                for _, err1 := range errs {
                                        s.logger.Error(ctx, "failed to send notifications", "error", err1.Error())
                                }
                        }
                }()
        }

        var auditKey string
        if approvalAction.Action == string(domain.ApprovalActionReject) {
                auditKey = AuditKeyReject
        } else if approvalAction.Action == string(domain.ApprovalActionApprove) {
                auditKey = AuditKeyApprove
        }
        if auditKey != "" {
                go func() {
                        ctx := context.WithoutCancel(ctx)
                        if err := s.auditLogger.Log(ctx, auditKey, approvalAction); err != nil {
                                s.logger.Error(ctx, "failed to record audit log", "error", err)
                        }
                }()
        }

        return appeal, nil
}

func (s *Service) Update(ctx context.Context, appeal *domain.Appeal) error {
        return s.repo.Update(ctx, appeal)
}

func (s *Service) Cancel(ctx context.Context, id string) (*domain.Appeal, error) {
        if id == "" {
                return nil, ErrAppealIDEmptyParam
        }

        if !utils.IsValidUUID(id) {
                return nil, InvalidError{AppealID: id}
        }

        appeal, err := s.GetByID(ctx, id)
        if err != nil {
                return nil, err
        }

        // TODO: check only appeal creator who is allowed to cancel the appeal

        if err := checkIfAppealStatusStillPending(appeal.Status); err != nil {
                return nil, err
        }

        appeal.Cancel()
        if err := s.repo.Update(ctx, appeal); err != nil {
                return nil, err
        }

        go func() {
                ctx := context.WithoutCancel(ctx)
                if err := s.auditLogger.Log(ctx, AuditKeyCancel, map[string]interface{}{
                        "appeal_id": id,
                }); err != nil {
                        s.logger.Error(ctx, "failed to record audit log", "error", err)
                }
        }()

        return appeal, nil
}

func (s *Service) AddApprover(ctx context.Context, appealID, approvalID, email string) (*domain.Appeal, error) {
        if err := s.validator.Var(email, "email"); err != nil {
                return nil, fmt.Errorf("%w: %s", ErrApproverEmail, err)
        }

        appeal, approval, err := s.getApproval(ctx, appealID, approvalID)
        if err != nil {
                return nil, err
        }
        if appeal.Status != domain.AppealStatusPending {
                return nil, fmt.Errorf("%w: can't add new approver to appeal with %q status", ErrUnableToAddApprover, appeal.Status)
        }
        if approval.IsStale {
                return nil, fmt.Errorf("%w: can't add new approver to a stale approval", ErrUnableToAddApprover)
        }
        if approval.IsExistingApprover(email) {
                return nil, fmt.Errorf("%w: approver %q already exists", ErrUnableToAddApprover, email)
        }

        switch approval.Status {
        case domain.ApprovalStatusPending:
                break
        case domain.ApprovalStatusBlocked:
                // check if approval type is auto
                // this approach is the quickest way to assume that approval is auto, otherwise need to fetch the policy details and lookup the approval type which takes more time
                if approval.Approvers == nil || len(approval.Approvers) == 0 {
                        // approval is automatic (strategy: auto) that is still on blocked
                        return nil, fmt.Errorf("%w: can't modify approvers for approval with strategy auto", ErrUnableToAddApprover)
                }
        default:
                return nil, fmt.Errorf("%w: can't add approver to approval with %q status", ErrUnableToAddApprover, approval.Status)
        }

        if err := s.approvalService.AddApprover(ctx, approval.ID, email); err != nil {
                return nil, fmt.Errorf("adding new approver: %w", err)
        }
        approval.Approvers = append(approval.Approvers, email)

        auditData, err := utils.StructToMap(approval)
        if err != nil {
                return nil, fmt.Errorf("converting approval to map: %w", err)
        }
        auditData["affected_approver"] = email
        go func() {
                ctx := context.WithoutCancel(ctx)
                if err := s.auditLogger.Log(ctx, AuditKeyAddApprover, auditData); err != nil {
                        s.logger.Error(ctx, "failed to record audit log", "error", err)
                }
        }()

        duration := domain.PermanentDurationLabel
        if !appeal.IsDurationEmpty() {
                duration, err = utils.GetReadableDuration(appeal.Options.Duration)
                if err != nil {
                        s.logger.Error(ctx, "failed to get readable duration", "error", err, "appeal_id", appeal.ID)
                }
        }

        go func() {
                ctx := context.WithoutCancel(ctx)
                if errs := s.notifier.Notify(ctx, []domain.Notification{
                        {
                                User: email,
                                Labels: map[string]string{
                                        "appeal_id": appeal.ID,
                                },
                                Message: domain.NotificationMessage{
                                        Type: domain.NotificationTypeApproverNotification,
                                        Variables: map[string]interface{}{
                                                "resource_name": fmt.Sprintf("%s (%s: %s)", appeal.Resource.Name, appeal.Resource.ProviderType, appeal.Resource.URN),
                                                "role":          appeal.Role,
                                                "requestor":     appeal.CreatedBy,
                                                "appeal_id":     appeal.ID,
                                                "account_id":    appeal.AccountID,
                                                "account_type":  appeal.AccountType,
                                                "provider_type": appeal.Resource.ProviderType,
                                                "resource_type": appeal.Resource.Type,
                                                "created_at":    appeal.CreatedAt,
                                                "approval_step": approval.Name,
                                                "actor":         email,
                                                "details":       appeal.Details,
                                                "duration":      duration,
                                                "creator":       appeal.Creator,
                                        },
                                },
                        },
                }); errs != nil {
                        for _, err1 := range errs {
                                s.logger.Error(ctx, "failed to send notifications", "error", err1.Error())
                        }
                }
        }()

        return appeal, nil
}

func (s *Service) DeleteApprover(ctx context.Context, appealID, approvalID, email string) (*domain.Appeal, error) {
        if err := s.validator.Var(email, "email"); err != nil {
                return nil, fmt.Errorf("%w: %s", ErrApproverEmail, err)
        }

        appeal, approval, err := s.getApproval(ctx, appealID, approvalID)
        if err != nil {
                return nil, err
        }
        if appeal.Status != domain.AppealStatusPending {
                return nil, fmt.Errorf("%w: can't delete approver to appeal with %q status", ErrUnableToDeleteApprover, appeal.Status)
        }
        if approval.IsStale {
                return nil, fmt.Errorf("%w: can't delete approver in a stale approval", ErrUnableToDeleteApprover)
        }

        switch approval.Status {
        case domain.ApprovalStatusPending:
                break
        case domain.ApprovalStatusBlocked:
                // check if approval type is auto
                // this approach is the quickest way to assume that approval is auto, otherwise need to fetch the policy details and lookup the approval type which takes more time
                if approval.Approvers == nil || len(approval.Approvers) == 0 {
                        // approval is automatic (strategy: auto) that is still on blocked
                        return nil, fmt.Errorf("%w: can't modify approvers for approval with strategy auto", ErrUnableToDeleteApprover)
                }
        default:
                return nil, fmt.Errorf("%w: can't delete approver to approval with %q status", ErrUnableToDeleteApprover, approval.Status)
        }

        if len(approval.Approvers) == 1 {
                return nil, fmt.Errorf("%w: can't delete if there's only one approver", ErrUnableToDeleteApprover)
        }

        if err := s.approvalService.DeleteApprover(ctx, approvalID, email); err != nil {
                return nil, err
        }

        var newApprovers []string
        for _, a := range approval.Approvers {
                if a != email {
                        newApprovers = append(newApprovers, a)
                }
        }
        approval.Approvers = newApprovers

        auditData, err := utils.StructToMap(approval)
        if err != nil {
                return nil, fmt.Errorf("converting approval to map: %w", err)
        }
        auditData["affected_approver"] = email
        go func() {
                ctx := context.WithoutCancel(ctx)
                if err := s.auditLogger.Log(ctx, AuditKeyDeleteApprover, auditData); err != nil {
                        s.logger.Error(ctx, "failed to record audit log", "error", err)
                }
        }()

        return appeal, nil
}

func (s *Service) getApproval(ctx context.Context, appealID, approvalID string) (*domain.Appeal, *domain.Approval, error) {
        if appealID == "" {
                return nil, nil, ErrAppealIDEmptyParam
        }
        if approvalID == "" {
                return nil, nil, ErrApprovalIDEmptyParam
        }

        appeal, err := s.repo.GetByID(ctx, appealID)
        if err != nil {
                return nil, nil, fmt.Errorf("getting appeal details: %w", err)
        }

        approval := appeal.GetApproval(approvalID)
        if approval == nil {
                return nil, nil, ErrApprovalNotFound
        }

        return appeal, approval, nil
}

// getAppealsMap returns map[account_id]map[resource_id]map[role]*domain.Appeal, error
func (s *Service) getAppealsMap(ctx context.Context, filters *domain.ListAppealsFilter) (map[string]map[string]map[string]*domain.Appeal, error) {
        appeals, err := s.repo.Find(ctx, filters)
        if err != nil {
                return nil, err
        }

        appealsMap := map[string]map[string]map[string]*domain.Appeal{}
        for _, a := range appeals {
                accountID := strings.ToLower(a.AccountID)
                if appealsMap[accountID] == nil {
                        appealsMap[accountID] = map[string]map[string]*domain.Appeal{}
                }
                if appealsMap[accountID][a.ResourceID] == nil {
                        appealsMap[accountID][a.ResourceID] = map[string]*domain.Appeal{}
                }
                appealsMap[accountID][a.ResourceID][a.Role] = a
        }

        return appealsMap, nil
}

func (s *Service) getResourcesMap(ctx context.Context, ids []string) (map[string]*domain.Resource, error) {
        filters := domain.ListResourcesFilter{IDs: ids}
        resources, err := s.resourceService.Find(ctx, filters)
        if err != nil {
                return nil, err
        }

        result := map[string]*domain.Resource{}
        for _, r := range resources {
                result[r.ID] = r
        }

        return result, nil
}

func (s *Service) getProvidersMap(ctx context.Context) (map[string]map[string]*domain.Provider, error) {
        providers, err := s.providerService.Find(ctx)
        if err != nil {
                return nil, err
        }

        providersMap := map[string]map[string]*domain.Provider{}
        for _, p := range providers {
                providerType := p.Type
                providerURN := p.URN
                if providersMap[providerType] == nil {
                        providersMap[providerType] = map[string]*domain.Provider{}
                }
                if providersMap[providerType][providerURN] == nil {
                        providersMap[providerType][providerURN] = p
                }
        }

        return providersMap, nil
}

func (s *Service) getPoliciesMap(ctx context.Context) (map[string]map[uint]*domain.Policy, error) {
        policies, err := s.policyService.Find(ctx)
        if err != nil {
                return nil, err
        }

        policiesMap := map[string]map[uint]*domain.Policy{}
        for _, p := range policies {
                id := p.ID
                if policiesMap[id] == nil {
                        policiesMap[id] = map[uint]*domain.Policy{}
                }
                policiesMap[id][p.Version] = p
                // set policiesMap[id][0] to latest policy version
                if policiesMap[id][0] == nil || p.Version > policiesMap[id][0].Version {
                        policiesMap[id][0] = p
                }
        }

        return policiesMap, nil
}

func (s *Service) getApprovalNotifications(ctx context.Context, appeal *domain.Appeal) []domain.Notification {
        notifications := []domain.Notification{}
        approval := appeal.GetNextPendingApproval()

        duration := domain.PermanentDurationLabel
        var err error
        if !appeal.IsDurationEmpty() {
                duration, err = utils.GetReadableDuration(appeal.Options.Duration)
                if err != nil {
                        s.logger.Error(ctx, "failed to get readable duration", "error", err, "appeal_id", appeal.ID)
                }
        }

        if approval != nil {
                for _, approver := range approval.Approvers {
                        notifications = append(notifications, domain.Notification{
                                User: approver,
                                Labels: map[string]string{
                                        "appeal_id": appeal.ID,
                                },
                                Message: domain.NotificationMessage{
                                        Type: domain.NotificationTypeApproverNotification,
                                        Variables: map[string]interface{}{
                                                "resource_name": fmt.Sprintf("%s (%s: %s)", appeal.Resource.Name, appeal.Resource.ProviderType, appeal.Resource.URN),
                                                "role":          appeal.Role,
                                                "requestor":     appeal.CreatedBy,
                                                "appeal_id":     appeal.ID,
                                                "account_id":    appeal.AccountID,
                                                "account_type":  appeal.AccountType,
                                                "provider_type": appeal.Resource.ProviderType,
                                                "resource_type": appeal.Resource.Type,
                                                "created_at":    appeal.CreatedAt,
                                                "approval_step": approval.Name,
                                                "actor":         approver,
                                                "details":       appeal.Details,
                                                "duration":      duration,
                                                "creator":       appeal.Creator,
                                        },
                                },
                        })
                }
        }
        return notifications
}

func checkIfAppealStatusStillPending(status string) error {
        switch status {
        case domain.AppealStatusPending:
                return nil
        case
                domain.AppealStatusCanceled,
                domain.AppealStatusApproved,
                domain.AppealStatusRejected:
                return fmt.Errorf("%w: %q", ErrAppealNotEligibleForApproval, status)
        default:
                return fmt.Errorf("%w: %q", ErrAppealStatusUnrecognized, status)
        }
}

func checkPreviousApprovalStatus(status, name string) error {
        switch status {
        case
                domain.ApprovalStatusApproved,
                domain.ApprovalStatusSkipped:
                return nil
        case
                domain.ApprovalStatusBlocked,
                domain.ApprovalStatusPending,
                domain.ApprovalStatusRejected:
                return fmt.Errorf("%w: found previous approval %q with status %q", ErrApprovalNotEligibleForAction, name, status)
        default:
                return fmt.Errorf("%w: found previous approval %q with unrecognized status %q", ErrApprovalStatusUnrecognized, name, status)
        }
}

func checkApprovalStatus(status string) error {
        switch status {
        case domain.ApprovalStatusPending:
                return nil
        case
                domain.ApprovalStatusBlocked,
                domain.ApprovalStatusApproved,
                domain.ApprovalStatusRejected,
                domain.ApprovalStatusSkipped:
                return fmt.Errorf("%w: approval status %q is not actionable", ErrApprovalNotEligibleForAction, status)
        default:
                return fmt.Errorf("%w: %q", ErrApprovalStatusUnrecognized, status)
        }
}

func (s *Service) handleAppealRequirements(ctx context.Context, a *domain.Appeal, p *domain.Policy) error {
        if p.Requirements != nil && len(p.Requirements) > 0 {
                g, ctx := errgroup.WithContext(ctx)

                for reqIndex, r := range p.Requirements {
                        isAppealMatchesRequirement, err := r.On.IsMatch(a)
                        if err != nil {
                                return fmt.Errorf("evaluating requirements[%v]: %v", reqIndex, err)
                        }
                        if !isAppealMatchesRequirement {
                                continue
                        }

                        for _, aa := range r.Appeals {
                                aa := aa // https://golang.org/doc/faq#closures_and_goroutines
                                g.Go(func() error {
                                        // TODO: populate resource data from policyService
                                        resource, err := s.resourceService.Get(ctx, aa.Resource)
                                        if err != nil {
                                                return fmt.Errorf("retrieving resource: %v", err)
                                        }

                                        additionalAppeal := &domain.Appeal{
                                                AccountID:   a.AccountID,
                                                AccountType: a.AccountType,
                                                CreatedBy:   a.CreatedBy,
                                                Role:        aa.Role,
                                                ResourceID:  resource.ID,
                                        }
                                        if aa.Options != nil {
                                                additionalAppeal.Options = aa.Options
                                        }
                                        if aa.Policy != nil {
                                                additionalAppeal.PolicyID = aa.Policy.ID
                                                additionalAppeal.PolicyVersion = uint(aa.Policy.Version)
                                        }
                                        if err := s.Create(ctx, []*domain.Appeal{additionalAppeal}, CreateWithAdditionalAppeal()); err != nil {
                                                if errors.Is(err, ErrAppealDuplicate) {
                                                        s.logger.Warn(ctx, "creating additional appeals, duplicate appeal error log", "error", err)
                                                        return nil
                                                }
                                                return fmt.Errorf("creating additional appeals: %w", err)
                                        }
                                        return nil
                                })
                        }
                }
                if err := g.Wait(); err == nil {
                        return err
                }
        }
        return nil
}

func (s *Service) GrantAccessToProvider(ctx context.Context, a *domain.Appeal, opts ...CreateAppealOption) error {
        policy := a.Policy
        if policy == nil {
                p, err := s.policyService.GetOne(ctx, a.PolicyID, a.PolicyVersion)
                if err != nil {
                        return fmt.Errorf("retrieving policy: %w", err)
                }
                policy = p
        }

        createAppealOpts := &createAppealOptions{}
        for _, opt := range opts {
                opt(createAppealOpts)
        }

        isAdditionalAppealCreation := createAppealOpts.IsAdditionalAppeal
        if !isAdditionalAppealCreation {
                if err := s.handleAppealRequirements(ctx, a, policy); err != nil {
                        return fmt.Errorf("handling appeal requirements: %w", err)
                }
        }

        appealCopy := *a
        appealCopy.Grant = nil
        grantWithAppeal := *a.Grant
        grantWithAppeal.Appeal = &appealCopy

        // grant access dependencies (if any)
        dependencyGrants, err := s.providerService.GetDependencyGrants(ctx, grantWithAppeal)
        if err != nil {
                return fmt.Errorf("getting grant dependencies: %w", err)
        }
        for _, dg := range dependencyGrants {
                activeDepGrants, err := s.grantService.List(ctx, domain.ListGrantsFilter{
                        Statuses:     []string{string(domain.GrantStatusActive)},
                        AccountIDs:   []string{dg.AccountID},
                        AccountTypes: []string{dg.AccountType},
                        ResourceIDs:  []string{dg.Resource.ID},
                        Permissions:  dg.Permissions,
                        Size:         1,
                })
                if err != nil {
                        return fmt.Errorf("failed to get existing active grant dependency: %w", err)
                }

                if len(activeDepGrants) > 0 {
                        continue
                }

                dg.Status = domain.GrantStatusActive
                dg.Appeal = &appealCopy
                if err := s.providerService.GrantAccess(ctx, *dg); err != nil {
                        return fmt.Errorf("failed to grant an access dependency: %w", err)
                }
                dg.Appeal = nil

                dg.Owner = a.CreatedBy
                if err := s.grantService.Create(ctx, dg); err != nil {
                        return fmt.Errorf("failed to store grant of access dependency: %w", err)
                }
        }

        // grant main access
        if err := s.providerService.GrantAccess(ctx, grantWithAppeal); err != nil {
                return fmt.Errorf("granting access: %w", err)
        }

        grantWithAppeal.Appeal = nil
        return nil
}

func (s *Service) checkExtensionEligibility(a *domain.Appeal, p *domain.Provider, policy *domain.Policy, activeGrant *domain.Grant) error {
        allowActiveAccessExtensionIn := ""

        // Default to use provider config if policy config is not set
        if p.Config.Appeal != nil {
                allowActiveAccessExtensionIn = p.Config.Appeal.AllowActiveAccessExtensionIn
        }

        // Use policy config if set
        if policy != nil &&
                policy.AppealConfig != nil &&
                policy.AppealConfig.AllowActiveAccessExtensionIn != "" {
                allowActiveAccessExtensionIn = policy.AppealConfig.AllowActiveAccessExtensionIn
        }

        if allowActiveAccessExtensionIn == "" {
                return ErrAppealFoundActiveGrant
        }

        extensionDurationRule, err := time.ParseDuration(allowActiveAccessExtensionIn)
        if err != nil {
                return fmt.Errorf("%w: %q: %v", ErrAppealInvalidExtensionDuration, allowActiveAccessExtensionIn, err)
        }

        if !activeGrant.IsEligibleForExtension(extensionDurationRule) {
                return fmt.Errorf("%w: extension is allowed %q before grant expiration", ErrGrantNotEligibleForExtension, allowActiveAccessExtensionIn)
        }
        return nil
}

func getPolicy(a *domain.Appeal, p *domain.Provider, policiesMap map[string]map[uint]*domain.Policy) (*domain.Policy, error) {
        var resourceConfig *domain.ResourceConfig
        for _, rc := range p.Config.Resources {
                if rc.Type == a.Resource.Type {
                        resourceConfig = rc
                        break
                }
        }
        if resourceConfig == nil {
                return nil, fmt.Errorf("%w: couldn't find %q resource type in the provider config", ErrInvalidResourceType, a.Resource.Type)
        }
        policyConfig := resourceConfig.Policy

        policy, ok := policiesMap[policyConfig.ID][uint(policyConfig.Version)]
        if !ok {
                return nil, fmt.Errorf("couldn't find details for policy %q: %w", fmt.Sprintf("%s@%v", policyConfig.ID, policyConfig.Version), ErrPolicyNotFound)
        }
        return policy, nil
}

func (s *Service) populateAppealMetadata(ctx context.Context, a *domain.Appeal, p *domain.Policy) error {
        if !p.HasAppealMetadataSources() {
                return nil
        }

        eg, egctx := errgroup.WithContext(ctx)
        var mu sync.Mutex
        appealMetadata := map[string]interface{}{}
        for key, metadata := range p.AppealConfig.MetadataSources {
                key, metadata := key, metadata
                eg.Go(func() error {
                        switch metadata.Type {
                        case "http":
                                var cfg policy.AppealMetadataSourceConfigHTTP
                                if err := mapstructure.Decode(metadata.Config, &cfg); err != nil {
                                        return fmt.Errorf("error decoding metadata config: %w", err)
                                }

                                if cfg.URL == "" {
                                        return fmt.Errorf("URL cannot be empty for http type")
                                }

                                var err error
                                cfg.URL, err = evaluateExpressionWithAppeal(a, cfg.URL)
                                if err != nil {
                                        return err
                                }

                                cfg.Body, err = evaluateExpressionWithAppeal(a, cfg.Body)
                                if err != nil {
                                        return err
                                }

                                clientCreator := &http.HttpClientCreatorStruct{}
                                metadataCl, err := http.NewHTTPClient(&cfg.HTTPClientConfig, clientCreator, "AppealMetadata")
                                if err != nil {
                                        return fmt.Errorf("key: %s, %w", key, err)
                                }

                                res, err := metadataCl.MakeRequest(egctx)
                                if err != nil || (res.StatusCode < 200 && res.StatusCode > 300) {
                                        if !cfg.AllowFailed {
                                                return fmt.Errorf("error fetching resource: %w", err)
                                        }
                                }

                                body, err := io.ReadAll(res.Body)
                                if err != nil {
                                        return fmt.Errorf("error reading response body: %w", err)
                                }
                                res.Body.Close()
                                var jsonBody interface{}
                                err = json.Unmarshal(body, &jsonBody)
                                if err != nil {
                                        return fmt.Errorf("error unmarshaling response body: %w", err)
                                }

                                responseMap := map[string]interface{}{
                                        "status":      res.Status,
                                        "status_code": res.StatusCode,
                                        "headers":     res.Header,
                                        "body":        jsonBody,
                                }
                                params := map[string]interface{}{
                                        "response": responseMap,
                                        "appeal":   a,
                                }

                                value, err := metadata.EvaluateValue(params)
                                if err != nil {
                                        return fmt.Errorf("error parsing value: %w", err)
                                }
                                mu.Lock()
                                appealMetadata[key] = value
                                mu.Unlock()
                        case "static":
                                params := map[string]interface{}{"appeal": a}
                                value, err := metadata.EvaluateValue(params)
                                if err != nil {
                                        return fmt.Errorf("error parsing value: %w", err)
                                }
                                mu.Lock()
                                appealMetadata[key] = value
                                mu.Unlock()
                        default:
                                return fmt.Errorf("invalid metadata source type")
                        }

                        return nil
                })
        }

        if err := eg.Wait(); err != nil {
                return err
        }

        if a.Details == nil {
                a.Details = map[string]interface{}{}
        }
        a.Details[domain.ReservedDetailsKeyPolicyMetadata] = appealMetadata

        return nil
}

func (s *Service) addCreatorDetails(ctx context.Context, a *domain.Appeal, p *domain.Policy) error {
        if p.IAM == nil {
                return nil
        }

        iamConfig, err := s.iam.ParseConfig(p.IAM)
        if err != nil {
                return fmt.Errorf("parsing policy.iam config: %w", err)
        }
        iamClient, err := s.iam.GetClient(iamConfig)
        if err != nil {
                return fmt.Errorf("initializing iam client: %w", err)
        }

        userDetails, err := iamClient.GetUser(a.CreatedBy)
        if err != nil {
                if p.AppealConfig != nil && p.AppealConfig.AllowCreatorDetailsFailure {
                        s.logger.Warn(ctx, "unable to get creator details", "error", err)
                        return nil
                }
                return fmt.Errorf("unable to get creator details: %w", err)
        }

        userDetailsMap, ok := userDetails.(map[string]interface{})
        if !ok {
                return nil
        }

        if p.IAM.Schema == nil {
                a.Creator = userDetailsMap
                return nil
        }

        creator := map[string]interface{}{}
        for schemaKey, targetKey := range p.IAM.Schema {
                if strings.Contains(targetKey, "$response") {
                        params := map[string]interface{}{
                                "response": userDetailsMap,
                        }
                        v, err := evaluator.Expression(targetKey).EvaluateWithVars(params)
                        if err != nil {
                                return fmt.Errorf("evaluating expression: %w", err)
                        }
                        creator[schemaKey] = v
                } else {
                        creator[schemaKey] = userDetailsMap[targetKey]
                }
        }

        a.Creator = creator
        s.logger.Debug(ctx, "added creator details", "creator", creator)

        return nil
}

func addResource(a *domain.Appeal, resourcesMap map[string]*domain.Resource) error {
        r := resourcesMap[a.ResourceID]
        if r == nil {
                return ErrResourceNotFound
        } else if r.IsDeleted {
                return ErrResourceDeleted
        }

        a.Resource = r
        return nil
}

func getProvider(a *domain.Appeal, providersMap map[string]map[string]*domain.Provider) (*domain.Provider, error) {
        provider, ok := providersMap[a.Resource.ProviderType][a.Resource.ProviderURN]
        if !ok {
                return nil, fmt.Errorf("couldn't find details for provider %q: %w", a.Resource.ProviderType+" - "+a.Resource.ProviderURN, ErrProviderNotFound)
        }
        return provider, nil
}

func validateAppeal(a *domain.Appeal, pendingAppealsMap map[string]map[string]map[string]*domain.Appeal) error {
        accountID := strings.ToLower(a.AccountID)
        if pendingAppealsMap[accountID] != nil &&
                pendingAppealsMap[accountID][a.ResourceID] != nil &&
                pendingAppealsMap[accountID][a.ResourceID][a.Role] != nil {
                return ErrAppealDuplicate
        }

        return nil
}

func (s *Service) getPermissions(ctx context.Context, pc *domain.ProviderConfig, resourceType, role string) ([]string, error) {
        permissions, err := s.providerService.GetPermissions(ctx, pc, resourceType, role)
        if err != nil {
                return nil, err
        }

        if permissions == nil {
                return nil, nil
        }

        strPermissions := []string{}
        for _, p := range permissions {
                strPermissions = append(strPermissions, fmt.Sprintf("%s", p))
        }
        return strPermissions, nil
}

// TODO(feature): add relation between new and revoked grant for traceability
func (s *Service) prepareGrant(ctx context.Context, appeal *domain.Appeal) (newGrant *domain.Grant, deactivatedGrant *domain.Grant, err error) {
        filter := domain.ListGrantsFilter{
                AccountIDs:  []string{appeal.AccountID},
                ResourceIDs: []string{appeal.ResourceID},
                Statuses:    []string{string(domain.GrantStatusActive)},
                Permissions: appeal.Permissions,
        }
        revocationReason := RevokeReasonForExtension
        if s.providerService.IsExclusiveRoleAssignment(ctx, appeal.Resource.ProviderType, appeal.Resource.Type) {
                filter.Permissions = nil
                revocationReason = RevokeReasonForOverride
        }

        activeGrants, err := s.grantService.List(ctx, filter)
        if err != nil {
                return nil, nil, fmt.Errorf("unable to retrieve existing active grants: %w", err)
        }

        if len(activeGrants) > 0 {
                deactivatedGrant = &activeGrants[0]
                if err := deactivatedGrant.Revoke(domain.SystemActorName, revocationReason); err != nil {
                        return nil, nil, fmt.Errorf("revoking previous grant: %w", err)
                }
        }

        if err := appeal.Approve(); err != nil {
                return nil, nil, fmt.Errorf("activating appeal: %w", err)
        }

        grant, err := s.grantService.Prepare(ctx, *appeal)
        if err != nil {
                return nil, nil, err
        }

        return grant, deactivatedGrant, nil
}

func (s *Service) GetAppealsTotalCount(ctx context.Context, filters *domain.ListAppealsFilter) (int64, error) {
        return s.repo.GetAppealsTotalCount(ctx, filters)
}

func evaluateExpressionWithAppeal(a *domain.Appeal, expression string) (string, error) {
        if expression != "" && strings.Contains(expression, "$appeal") {
                appealMap, err := a.ToMap()
                if err != nil {
                        return "", fmt.Errorf("error converting appeal to map: %w", err)
                }
                params := map[string]interface{}{"appeal": appealMap}
                evaluated, err := evaluator.Expression(expression).EvaluateWithVars(params)
                if err != nil {
                        return "", fmt.Errorf("error evaluating expression %w", err)
                }
                evaluatedStr, ok := evaluated.(string)
                if !ok {
                        return "", fmt.Errorf("expression must evaluate to a string")
                }
                return evaluatedStr, nil
        }
        return expression, nil
}

goto / guardian / 12304289958

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