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permission.go
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permission.go
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package roles
type PermissionMode uint32
const (
Read PermissionMode = 1 << (32 - 1 - iota)
Update
Create
Delete
CRUD
)
var All = map[string]PermissionMode{"Read": Read, "Update": Update, "Create": Create, "Delete": Delete, "CRUD": CRUD}
type Permission struct {
Role *Role
allowRoles map[PermissionMode][]string
denyRoles map[PermissionMode][]string
}
func hasSameElem(vs1 []string, vs2 []string) bool {
for _, v1 := range vs1 {
for _, v2 := range vs2 {
if v1 == v2 {
return true
}
}
}
return false
}
func (permission *Permission) HasPermission(mode PermissionMode, roles ...string) bool {
if len(permission.denyRoles) != 0 {
if denyRoles := permission.denyRoles[mode]; denyRoles != nil {
if hasSameElem(denyRoles, roles) {
return false
}
}
}
if len(permission.allowRoles) != 0 {
if allowRoles := permission.allowRoles[mode]; allowRoles != nil {
if hasSameElem(allowRoles, roles) {
return true
}
}
} else if len(permission.denyRoles) != 0 {
return true
}
return false
}
func (permission *Permission) Allow(mode PermissionMode, roles ...string) *Permission {
if mode == CRUD {
return permission.Allow(Create, roles...).Allow(Update, roles...).Allow(Read, roles...).Allow(Delete, roles...)
}
if permission.allowRoles[mode] == nil {
permission.allowRoles[mode] = []string{}
}
permission.allowRoles[mode] = append(permission.allowRoles[mode], roles...)
return permission
}
func (permission *Permission) Deny(mode PermissionMode, roles ...string) *Permission {
if mode == CRUD {
return permission.Deny(Create, roles...).Deny(Update, roles...).Deny(Read, roles...).Deny(Delete, roles...)
}
if permission.denyRoles[mode] == nil {
permission.denyRoles[mode] = []string{}
}
permission.denyRoles[mode] = append(permission.denyRoles[mode], roles...)
return permission
}