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package staticcheck
import (
"fmt"
"go/constant"
"go/types"
"net"
"net/url"
"regexp"
"sort"
"strconv"
"strings"
"time"
"unicode/utf8"
"honnef.co/go/tools/lint"
. "honnef.co/go/tools/lint/lintdsl"
"honnef.co/go/tools/ssa"
"honnef.co/go/tools/staticcheck/vrp"
)
const (
MsgInvalidHostPort = "invalid port or service name in host:port pair"
MsgInvalidUTF8 = "argument is not a valid UTF-8 encoded string"
MsgNonUniqueCutset = "cutset contains duplicate characters"
)
type Call struct {
Job *lint.Job
Instr ssa.CallInstruction
Args []*Argument
Checker *Checker
Parent *ssa.Function
invalids []string
}
func (c *Call) Invalid(msg string) {
c.invalids = append(c.invalids, msg)
}
type Argument struct {
Value Value
invalids []string
}
func (arg *Argument) Invalid(msg string) {
arg.invalids = append(arg.invalids, msg)
}
type Value struct {
Value ssa.Value
Range vrp.Range
}
type CallCheck func(call *Call)
func extractConsts(v ssa.Value) []*ssa.Const {
switch v := v.(type) {
case *ssa.Const:
return []*ssa.Const{v}
case *ssa.MakeInterface:
return extractConsts(v.X)
default:
return nil
}
}
func ValidateRegexp(v Value) error {
for _, c := range extractConsts(v.Value) {
if c.Value == nil {
continue
}
if c.Value.Kind() != constant.String {
continue
}
s := constant.StringVal(c.Value)
if _, err := regexp.Compile(s); err != nil {
return err
}
}
return nil
}
func ValidateTimeLayout(v Value) error {
for _, c := range extractConsts(v.Value) {
if c.Value == nil {
continue
}
if c.Value.Kind() != constant.String {
continue
}
s := constant.StringVal(c.Value)
s = strings.Replace(s, "_", " ", -1)
s = strings.Replace(s, "Z", "-", -1)
_, err := time.Parse(s, s)
if err != nil {
return err
}
}
return nil
}
func ValidateURL(v Value) error {
for _, c := range extractConsts(v.Value) {
if c.Value == nil {
continue
}
if c.Value.Kind() != constant.String {
continue
}
s := constant.StringVal(c.Value)
_, err := url.Par
8000
se(s)
if err != nil {
return fmt.Errorf("%q is not a valid URL: %s", s, err)
}
}
return nil
}
func IntValue(v Value, z vrp.Z) bool {
r, ok := v.Range.(vrp.IntInterval)
if !ok || !r.IsKnown() {
return false
}
if r.Lower != r.Upper {
return false
}
if r.Lower.Cmp(z) == 0 {
return true
}
return false
}
func InvalidUTF8(v Value) bool {
for _, c := range extractConsts(v.Value) {
if c.Value == nil {
continue
}
if c.Value.Kind() != constant.String {
continue
}
s := constant.StringVal(c.Value)
if !utf8.ValidString(s) {
return true
}
}
return false
}
func UnbufferedChannel(v Value) bool {
r, ok := v.Range.(vrp.ChannelInterval)
if !ok || !r.IsKnown() {
return false
}
if r.Size.Lower.Cmp(vrp.NewZ(0)) == 0 &&
r.Size.Upper.Cmp(vrp.NewZ(0)) == 0 {
return true
}
return false
}
func Pointer(v Value) bool {
switch v.Value.Type().Underlying().(type) {
case *types.Pointer, *types.Interface:
return true
}
return false
}
func ConvertedFromInt(v Value) bool {
conv, ok := v.Value.(*ssa.Convert)
if !ok {
return false
}
b, ok := conv.X.Type().Underlying().(*types.Basic)
if !ok {
return false
}
if (b.Info() & types.IsInteger) == 0 {
return false
}
return true
}
func validEncodingBinaryType(j *lint.Job, typ types.Type) bool {
typ = typ.Underlying()
switch typ := typ.(type) {
case *types.Basic:
switch typ.Kind() {
case types.Uint8, types.Uint16, types.Uint32, types.Uint64,
types.Int8, types.Int16, types.Int32, types.Int64,
types.Float32, types.Float64, types.Complex64, types.Complex128, types.Invalid:
return true
case types.Bool:
return IsGoVersion(j, 8)
}
return false
case *types.Struct:
n := typ.NumFields()
for i := 0; i < n; i++ {
if !validEncodingBinaryType(j, typ.Field(i).Type()) {
return false
}
}
return true
case *types.Array:
return validEncodingBinaryType(j, typ.Elem())
case *types.Interface:
// we can't determine if it's a valid type or not
return true
}
return false
}
func CanBinaryMarshal(j *lint.Job, v Value) bool {
typ := v.Value.Type().Underlying()
if ttyp, ok := typ.(*types.Pointer); ok {
typ = ttyp.Elem().Underlying()
}
if ttyp, ok := typ.(interface {
Elem() types.Type
}); ok {
if _, ok := ttyp.(*types.Pointer); !ok {
typ = ttyp.Elem()
}
}
return validEncodingBinaryType(j, typ)
}
func RepeatZeroTimes(name string, arg int) CallCheck {
return func(call *Call) {
arg := call.Args[arg]
if IntValue(arg.Value, vrp.NewZ(0)) {
arg.Invalid(fmt.Sprintf("calling %s with n == 0 will return no results, did you mean -1?", name))
}
}
}
func validateServiceName(s string) bool {
if len(s) < 1 || len(s) > 15 {
return false
}
if s[0] == '-' || s[len(s)-1] == '-' {
return false
}
if strings.Contains(s, "--") {
return false
}
hasLetter := false
for _, r := range s {
if (r >= 'A' && r <= 'Z') || (r >= 'a' && r <= 'z') {
hasLetter = true
continue
}
if r >= '0' && r <= '9' {
continue
}
return false
}
return hasLetter
}
func validatePort(s string) bool {
n, err := strconv.ParseInt(s, 10, 64)
if err != nil {
return validateServiceName(s)
}
return n >= 0 && n <= 65535
}
func ValidHostPort(v Value) bool {
for _, k := range extractConsts(v.Value) {
if k.Value == nil {
continue
}
if k.Value.Kind() != constant.String {
continue
}
s := constant.StringVal(k.Value)
_, port, err := net.SplitHostPort(s)
if err != nil {
return false
}
// TODO(dh): check hostname
if !validatePort(port) {
return false
}
}
return true
}
// ConvertedFrom reports whether value v was converted from type typ.
func ConvertedFrom(v Value, typ string) bool {
change, ok := v.Value.(*ssa.ChangeType)
return ok && IsType(change.X.Type(), typ)
}
func UniqueStringCutset(v Value) bool {
for _, c := range extractConsts(v.Value) {
if c.Value == nil {
continue
}
if c.Value.Kind() != constant.String {
continue
}
s := constant.StringVal(c.Value)
rs := runeSlice(s)
if len(rs) < 2 {
continue
}
sort.Sort(rs)
for i, r := range rs[1:] {
if rs[i] == r {
return false
}
}
}
return true
}