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July 1, 2015 07:57
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inline struct rbac
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| package main | |
| import ( | |
| "log" | |
| "reflect" | |
| "strings" | |
| ) | |
| type RoleAccess struct { | |
| RoleName string | |
| AllowedActions []string | |
| } | |
| func (a *RoleAccess) HasAccess(action string) (isGranted bool) { | |
| for _, a := range a.AllowedActions { | |
| if action == a || a == "*" { | |
| return true | |
| } | |
| } | |
| return false | |
| } | |
| type FieldRBAC struct { | |
| RolesAccess map[string]RoleAccess | |
| } | |
| // parse per field access config | |
| func NewFieldRBAC(rolesConfig []string) (rbac *FieldRBAC) { | |
| rbac = &FieldRBAC{RolesAccess: make(map[string]RoleAccess)} | |
| for _, role := range rolesConfig { | |
| roleACL := strings.Split(role, ":") | |
| roleName, allowedActions := strings.Trim(roleACL[0], " "), strings.Fields(roleACL[1]) | |
| acl := RoleAccess{RoleName: roleName, AllowedActions: allowedActions} | |
| rbac.RolesAccess[roleName] = acl | |
| } | |
| return | |
| } | |
| func (r *FieldRBAC) HasAccess(roles []string, action string) (isGranted bool) { | |
| for _, role := range roles { | |
| roleAccess, roleDefined := r.RolesAccess[role] | |
| if roleDefined && roleAccess.HasAccess(action) { | |
| return true | |
| } | |
| } | |
| // check '*' role | |
| roleAccess, roleDefined := r.RolesAccess["*"] | |
| if roleDefined && roleAccess.HasAccess(action) { | |
| return true | |
| } | |
| return false | |
| } | |
| type GlobalAccess struct { | |
| RoleActions map[string]RoleAccess | |
| } | |
| type ACL struct { | |
| // global access control for the struct | |
| global *FieldRBAC | |
| // per field access control | |
| fields map[string]*FieldRBAC | |
| } | |
| // check global access | |
| func (acl *ACL) HasAccess(roles []string, action string) (isGranted bool) { | |
| return acl.global.HasAccess(roles, action) | |
| } | |
| // check global & per field access | |
| func (acl *ACL) HasAccessToFields(roles []string, action string, fields []string) (isGranted bool) { | |
| globalAccess := acl.HasAccess(roles, action) | |
| if !globalAccess { | |
| return false | |
| } | |
| for _, field := range fields { | |
| fieldACL, fieldACLDefined := acl.fields[field] | |
| if fieldACLDefined { | |
| hasAccess := fieldACL.HasAccess(roles, action) | |
| if !hasAccess { | |
| return false | |
| } | |
| } | |
| } | |
| return true | |
| } | |
| func GetFirstTagValue(tag reflect.StructTag, attr string) (value string) { | |
| tagValue := tag.Get(attr) | |
| if len(tagValue) == 0 { | |
| return | |
| } | |
| value = strings.Split(tagValue, ",")[0] | |
| return | |
| } | |
| func GetFieldName(field reflect.StructField) (value string) { | |
| value = field.Tag.Get("access_field_name") | |
| if len(value) > 0 { | |
| return | |
| } | |
| value = GetFirstTagValue(field.Tag, "json") | |
| if len(value) > 0 { | |
| return | |
| } | |
| value = field.Name | |
| return | |
| } | |
| func NewACL(s interface{}) (acl *ACL) { | |
| acl = &ACL{fields: make(map[string]*FieldRBAC)} | |
| tagType := reflect.TypeOf(s) | |
| for i := 0; i < tagType.NumField(); i++ { | |
| field := tagType.Field(i) | |
| access := field.Tag.Get("access") | |
| rolesConfig := strings.Split(access, ",") | |
| fieldName := GetFieldName(field) | |
| if fieldName == "acl" { | |
| acl.global = NewFieldRBAC(rolesConfig) | |
| } else { | |
| acl.fields[fieldName] = NewFieldRBAC(rolesConfig) | |
| } | |
| } | |
| return | |
| } | |
| type User struct { | |
| DisplayName string `access:"admin:*, owner: read update, *: read" json:"display_name"` | |
| Password string `access:"admin:*, owner: read update" json:"password"` | |
| ACL *ACL `access:"admin:*, owner: update, *: read" access_field_name:"acl"` | |
| } | |
| func NewUser() (user User) { | |
| user = User{DisplayName: "Foo Bar"} | |
| user.ACL = NewACL(user) | |
| return | |
| } | |
| func main() { | |
| u := NewUser() | |
| log.Println("done", u.ACL.HasAccess([]string{"admin"}, "delete")) | |
| log.Println(u.ACL.HasAccess([]string{"anon"}, "delete")) | |
| log.Println(u.ACL.HasAccessToFields([]string{"owner"}, "read", []string{"display_name"})) | |
| log.Println(u.ACL.HasAccessToFields([]string{"anon"}, "read", []string{"display_name"})) | |
| log.Println(u.ACL.HasAccessToFields([]string{"anon"}, "read", []string{"display_name", "password"})) | |
| } |
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