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encoding/json: marshal maps using reflect.Value.MapRange

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Map serialization using reflect.Value.MapIndex cannot retrieve
map keys that contain a NaN, resulting in a panic.
Switch the implementation to use the reflect.Value.MapRange method
instead, which iterates over all map entries regardless of whether
they are directly retrievable.

Note that according to RFC 8259, section 4, a JSON object should
have unique names, but does not forbid the occurrence of duplicate names.

Fixes #43207

Change-Id: If4bc55229b1f64b8ca4b0fed37549725efdace39
Reviewed-on: https://go-review.googlesource.com/c/go/+/278632
Trust: Meng Zhuo <mzh@golangcn.org>
Trust: Joe Tsai <thebrokentoaster@gmail.com>
Trust: Bryan C. Mills <bcmills@google.com>
Run-TryBot: Meng Zhuo <mzh@golangcn.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Joe Tsai <thebrokentoaster@gmail.com>
Reviewed-by: Daniel Martí <mvdan@mvdan.cc>
This commit is contained in:
Meng Zhuo 2021-01-21 22:53:30 +08:00
parent 96a96a9058
commit a7526bbf72
2 changed files with 40 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

36
src/encoding/json/encode.go
View File

@ -794,23 +794,24 @@ func (me mapEncoder) encode(e *encodeState, v reflect.Value, opts encOpts) {
e.WriteByte('{')
// Extract and sort the keys.
keys := v.MapKeys()
sv := make([]reflectWithString, len(keys))
for i, v := range keys {
sv[i].v = v
sv := make([]reflectWithString, v.Len())
mi := v.MapRange()
for i := 0; mi.Next(); i++ {
sv[i].k = mi.Key()
sv[i].v = mi.Value()
if err := sv[i].resolve(); err != nil {
e.error(fmt.Errorf("json: encoding error for type %q: %q", v.Type().String(), err.Error()))
}
}
sort.Slice(sv, func(i, j int) bool { return sv[i].s < sv[j].s })
sort.Slice(sv, func(i, j int) bool { return sv[i].ks < sv[j].ks })
for i, kv := range sv {
if i > 0 {
e.WriteByte(',')
}
e.string(kv.s, opts.escapeHTML)
e.string(kv.ks, opts.escapeHTML)
e.WriteByte(':')
me.elemEnc(e, v.MapIndex(kv.v), opts)
me.elemEnc(e, kv.v, opts)
}
e.WriteByte('}')
e.ptrLevel--
@ -997,29 +998,30 @@ func typeByIndex(t reflect.Type, index []int) reflect.Type {
}
type reflectWithString struct {
v reflect.Value
s string
k reflect.Value
v reflect.Value
ks string
}
func (w *reflectWithString) resolve() error {
if w.v.Kind() == reflect.String {
w.s = w.v.String()
if w.k.Kind() == reflect.String {
w.ks = w.k.String()
return nil
}
if tm, ok := w.v.Interface().(encoding.TextMarshaler); ok {
if w.v.Kind() == reflect.Ptr && w.v.IsNil() {
if tm, ok := w.k.Interface().(encoding.TextMarshaler); ok {
if w.k.Kind() == reflect.Ptr && w.k.IsNil() {
return nil
}
buf, err := tm.MarshalText()
w.s = string(buf)
w.ks = string(buf)
return err
}
switch w.v.Kind() {
switch w.k.Kind() {
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
w.s = strconv.FormatInt(w.v.Int(), 10)
w.ks = strconv.FormatInt(w.k.Int(), 10)
return nil
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
w.s = strconv.FormatUint(w.v.Uint(), 10)
w.ks = strconv.FormatUint(w.k.Uint(), 10)
return nil
}
panic("unexpected map key type")

21
src/encoding/json/encode_test.go
View File

@ -245,6 +245,22 @@ func TestUnsupportedValues(t *testing.T) {
}
}
// Issue 43207
func TestMarshalTextFloatMap(t *testing.T) {
m := map[textfloat]string{
textfloat(math.NaN()): "1",
textfloat(math.NaN()): "1",
}
got, err := Marshal(m)
if err != nil {
t.Errorf("Marshal() error: %v", err)
}
want := `{"TF:NaN":"1","TF:NaN":"1"}`
if string(got) != want {
t.Errorf("Marshal() = %s, want %s", got, want)
}
}
// Ref has Marshaler and Unmarshaler methods with pointer receiver.
type Ref int
@ -854,6 +870,10 @@ func tenc(format string, a ...interface{}) ([]byte, error) {
return buf.Bytes(), nil
}
type textfloat float64
func (f textfloat) MarshalText() ([]byte, error) { return tenc(`TF:%0.2f`, f) }
// Issue 13783
func TestEncodeBytekind(t *testing.T) {
testdata := []struct {
@ -872,6 +892,7 @@ func TestEncodeBytekind(t *testing.T) {
{[]jsonint{5, 4}, `[{"JI":5},{"JI":4}]`},
{[]textint{9, 3}, `["TI:9","TI:3"]`},
{[]int{9, 3}, `[9,3]`},
{[]textfloat{12, 3}, `["TF:12.00","TF:3.00"]`},
}
for _, d := range testdata {
js, err := Marshal(d.data)