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casbin.go
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casbin.go
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package casbin
import (
"context"
stdcasbin "github.com/casbin/casbin/v2"
"github.com/casbin/casbin/v2/model"
"github.com/casbin/casbin/v2/persist"
"github.com/beiduoke/go-scaffold/pkg/auth/authz"
)
var _ authz.Authorized = (*State)(nil)
type State struct {
model model.Model
policy persist.Adapter
enforcer stdcasbin.IEnforcer
watcher persist.Watcher
projects authz.Projects
wildcardItem string
authorizedProjectsMatcher string
}
func NewAuthorized(_ context.Context, opts ...Option) (*State, error) {
s := State{
policy: newAdapter(),
projects: authz.Projects{},
wildcardItem: "*",
authorizedProjectsMatcher: "g(r.sub, p.sub, p.dom) && (keyMatch(r.dom, p.dom) || p.dom == '*')",
watcher: nil,
}
for _, opt := range opts {
opt(&s)
}
var err error
if s.model == nil {
s.model, err = model.NewModelFromString(DefaultRestfullWithRoleModel)
if err != nil {
return nil, err
}
}
if s.enforcer == nil {
s.enforcer, err = stdcasbin.NewSyncedEnforcer(s.model, s.policy)
}
if err != nil {
return nil, err
}
if s.watcher != nil {
err = s.enforcer.SetWatcher(s.watcher)
s.watcher.SetUpdateCallback(func(v string) {
s.enforcer.LoadPolicy()
})
}
return &s, err
}
func (s *State) ProjectsAuthorized(_ context.Context, subjects authz.Subjects, action authz.Action, resource authz.Resource, projects authz.Projects) (authz.Projects, error) {
result := make(authz.Projects, 0, len(projects))
var err error
var allowed bool
for _, project := range projects {
for _, subject := range subjects {
if allowed, err = s.enforcer.Enforce(string(subject), string(resource), string(action), string(project)); err != nil {
//fmt.Println(allowed, err)
return nil, err
} else if allowed {
result = append(result, project)
}
}
}
return result, nil
}
func (s *State) FilterAuthorizedPairs(_ context.Context, subjects authz.Subjects, pairs authz.Pairs) (authz.Pairs, error) {
result := make(authz.Pairs, 0, len(pairs))
project := authz.Project(s.wildcardItem)
var err error
var allowed bool
for _, p := range pairs {
for _, subject := range subjects {
if allowed, err = s.enforcer.Enforce(string(subject), string(p.Resource), string(p.Action), string(project)); err != nil {
//fmt.Println(allowed, err)
return nil, err
} else if allowed {
result = append(result, p)
}
}
}
return result, nil
}
func (s *State) FilterAuthorizedProjects(_ context.Context, subjects authz.Subjects) (authz.Projects, error) {
result := make(authz.Projects, 0, len(s.projects))
resource := authz.Resource(s.wildcardItem)
action := authz.Action(s.wildcardItem)
var err error
var allowed bool
for _, project := range s.projects {
for _, subject := range subjects {
if allowed, err = s.enforcer.EnforceWithMatcher(s.authorizedProjectsMatcher, string(subject), string(resource), string(action), string(project)); err != nil {
//fmt.Println(allowed, err)
return nil, err
} else if allowed {
result = append(result, project)
}
}
}
return result, nil
}
func (s *State) IsAuthorized(_ context.Context, subject authz.Subject, action authz.Action, resource authz.Resource, project authz.Project) (bool, error) {
if len(project) == 0 {
project = authz.Project(s.wildcardItem)
}
var err error
var allowed bool
if allowed, err = s.enforcer.Enforce(string(subject), string(resource), string(action), string(project)); err != nil {
return false, err
} else if allowed {
return true, nil
}
return false, nil
}
func (s *State) SetPolicies(_ context.Context, policyMap authz.PolicyMap, _ authz.RoleMap) error {
// s.policy.SetPolicies(policyMap)
// s.policy.SavePolicy()
err := s.enforcer.LoadPolicy()
//fmt.Println(err, s.enforcer.GetAllSubjects(), s.enforcer.GetAllRoles())
projects, ok := policyMap["projects"]
if ok {
switch t := projects.(type) {
case authz.Projects:
s.projects = t
}
}
return err
}