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attribute.go
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attribute.go
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package cpe
import (
"regexp"
"strings"
)
// Attribute groups PartAttr and StringAttr.
type Attribute interface {
wfnEncoded() string
urlEncoded() string
fmtString() string
String() string
IsEmpty() bool
IsValid() bool
Comparison(Attribute) Relation
}
// PartAttr reprecents part attribute of cpe item.
type PartAttr rune
// StringAttr reprecents other than part attribute of cpe item.
type StringAttr struct {
raw string
isNa bool
}
var (
Application = PartAttr('a')
OperationgSystem = PartAttr('o')
Hardware = PartAttr('h')
PartNotSet = PartAttr(0x00)
Any = StringAttr{}
Na = StringAttr{isNa: true}
)
func newPartAttrFromWfnEncoded(str string) PartAttr {
if len(str) != 3 {
return PartNotSet
}
switch PartAttr(str[1]) {
case Application:
return Application
case OperationgSystem:
return OperationgSystem
case Hardware:
return Hardware
}
return PartNotSet
}
func newPartAttrFromUriEncoded(str string) PartAttr {
if len(str) != 1 {
return PartNotSet
}
switch PartAttr(str[0]) {
case Application:
return Application
case OperationgSystem:
return OperationgSystem
case Hardware:
return Hardware
}
return PartNotSet
}
func newPartAttrFromFmtEncoded(str string) PartAttr {
if len(str) != 1 {
return PartNotSet
}
switch PartAttr(str[0]) {
case Application:
return Application
case OperationgSystem:
return OperationgSystem
case Hardware:
return Hardware
}
return PartNotSet
}
func (m PartAttr) String() string {
if m.IsValid() {
return string(m)
} else {
panic("\"%v\" is not valid as part attribute.")
}
}
func (m PartAttr) wfnEncoded() string {
return "\"" + m.String() + "\""
}
func (m PartAttr) fmtString() string {
return m.String()
}
func (m PartAttr) urlEncoded() string {
return m.String()
}
func (m PartAttr) IsValid() bool {
switch m {
case Application, OperationgSystem, Hardware:
return true
default:
return false
}
}
func (m PartAttr) IsEmpty() bool {
return m == PartNotSet
}
func (src PartAttr) Comparison(trg Attribute) Relation {
trg_part, ok := trg.(PartAttr)
if !ok {
return Undefined
}
if !src.IsValid() || !trg_part.IsValid() {
return Undefined
}
if src == trg_part {
return Equal
}
return Disjoint
}
// NewStringAttr returns attribute of item with str.
func NewStringAttr(str string) StringAttr {
return StringAttr{
raw: str,
}
}
func newStringAttrFromWfnEncoded(str string) StringAttr {
if str == "NA" {
return Na
} else if str == "ANY" {
return Any
}
return StringAttr{
raw: wfn_encoder.Decode(strings.TrimPrefix(strings.TrimSuffix(str, "\""), "\"")),
}
}
func newStringAttrFromUriEncoded(str string) StringAttr {
if str == "-" {
return Na
} else if str == "" || str == "*" {
return Any
}
return StringAttr{
raw: url_encoder.Decode(str),
}
}
func newStringAttrFromFmtEncoded(str string) StringAttr {
if str == "-" {
return Na
} else if str == "*" {
return Any
}
return StringAttr{
raw: fmt_encoder.Decode(str),
}
}
func (s StringAttr) String() string {
if s.isNa {
return "-"
} else if len(s.raw) == 0 {
return "*"
}
return s.raw
}
func (s StringAttr) wfnEncoded() string {
if s.isNa {
return "NA"
} else if len(s.raw) == 0 {
return "ANY"
}
return "\"" + wfn_encoder.Encode(s.raw) + "\""
}
func (s StringAttr) fmtString() string {
if s.isNa {
return "-"
} else if len(s.raw) == 0 {
return "*"
}
return fmt_encoder.Encode(s.raw)
}
func (s StringAttr) urlEncoded() string {
if s.IsEmpty() {
return "" // *
} else if s.isNa {
return "-"
}
return url_encoder.Encode(s.raw)
}
// Empty StringAttr means ANY.
func (s StringAttr) IsEmpty() bool {
return s.raw == "" && !s.isNa
}
var stringAttrIsValidRegExp = regexp.MustCompile("\\A(\\*|\\?+){0,1}[a-zA-Z0-9\\-_!\"#$%&'()+,./:;<=>@\\[\\]^`{}\\|~\\\\]+(\\*|\\?+){0,1}$")
func (s StringAttr) IsValid() bool {
if s.isNa && len(s.raw) != 0 {
return false
}
if stringAttrIsValidRegExp.FindString(s.raw) != s.raw {
return false
}
return true
}
func (src StringAttr) Comparison(trg Attribute) Relation {
trg_str, ok := trg.(StringAttr)
if !ok {
return Undefined
}
if !src.IsValid() || !trg_str.IsValid() {
return Undefined
}
if src == Any {
if trg_str == Any {
return Equal
} else if trg_str == Na {
return Superset
} else if !trg_str.withWildCard() {
return Superset
}
return Undefined
}
if src == Na {
if trg_str == Any {
return Subset
} else if trg_str == Na {
return Equal
} else if !trg_str.withWildCard() {
return Disjoint
}
return Undefined
}
if src.withWildCard() {
if trg_str == Any {
return Subset
} else if trg_str == Na {
return Disjoint
} else if trg_str.withWildCard() {
return Undefined
} else if match_wildcard(src.raw, trg_str.raw) {
return Superset
}
return Disjoint
} else {
if trg_str == Any {
return Subset
} else if trg_str == Na {
return Disjoint
} else if trg_str.withWildCard() {
return Undefined
} else if trg_str.raw == src.raw {
return Equal
}
return Disjoint
}
return Undefined
}
func (m StringAttr) withWildCard() bool {
prefix, suffix := m.raw[0], m.raw[len(m.raw)-1]
return prefix == '*' || prefix == '?' || suffix == '*' || suffix == '?'
}
func match_wildcard(src, trg string) bool {
sufw, sufq, prew, preq := 0, 0, 0, 0
if strings.HasPrefix(src, "?") {
before := len(src)
src = strings.TrimLeft(src, "?")
preq = before - len(src)
}
if strings.HasPrefix(src, "*") {
src = strings.TrimPrefix(src, "*")
prew = 1
}
if strings.HasSuffix(src, "?") {
before := len(src)
src = strings.TrimRight(src, "?")
sufq = before - len(src)
}
if strings.HasSuffix(src, "*") {
src = strings.TrimSuffix(src, "*")
sufw = 1
}
i := strings.Index(trg, src)
if prew != 0 {
if i != len(trg)-len(src)-sufq && sufw == 0 {
return false
}
}
if sufw != 0 {
if i != preq && prew == 0 {
return false
}
}
if preq != 0 {
if i != preq || (i != len(trg)-len(src)-sufq && sufw == 0) {
return false
}
}
if sufq != 0 {
if i != len(trg)-sufq-len(src) || (i != preq && prew == 0) {
return false
}
}
return true
}