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authorJeffrey Wilcke <geffobscura@gmail.com>2016-04-01 18:03:06 +0800
committerJeffrey Wilcke <geffobscura@gmail.com>2016-04-01 18:56:54 +0800
commitd63e29241d27954d44215931e787e86dfaf230a6 (patch)
tree03aafd58c130965cdcc7bd5ccbdde70239f81556
parent10d3466c934bd425a8c941270749a652a588527d (diff)
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common: added Hash unmarshal json length validation
-rw-r--r--common/types.go13
-rw-r--r--common/types_test.go22
2 files changed, 35 insertions, 0 deletions
diff --git a/common/types.go b/common/types.go
index b1666d733..fec986164 100644
--- a/common/types.go
+++ b/common/types.go
@@ -19,10 +19,12 @@ package common
import (
"encoding/hex"
"encoding/json"
+ "errors"
"fmt"
"math/big"
"math/rand"
"reflect"
+ "strings"
)
const (
@@ -30,6 +32,8 @@ const (
AddressLength = 20
)
+var hashJsonLengthErr = errors.New("common: unmarshalJSON failed: hash must be exactly 32 bytes")
+
type (
Hash [HashLength]byte
Address [AddressLength]byte
@@ -58,6 +62,15 @@ func (h *Hash) UnmarshalJSON(input []byte) error {
if length >= 2 && input[0] == '"' && input[length-1] == '"' {
input = input[1 : length-1]
}
+ // strip "0x" for length check
+ if len(input) > 1 && strings.ToLower(string(input[:2])) == "0x" {
+ input = input[2:]
+ }
+
+ // validate the length of the input hash
+ if len(input) != HashLength*2 {
+ return hashJsonLengthErr
+ }
h.SetBytes(FromHex(string(input)))
return nil
}
diff --git a/common/types_test.go b/common/types_test.go
index edf8d4d14..f2dfbf0c9 100644
--- a/common/types_test.go
+++ b/common/types_test.go
@@ -29,3 +29,25 @@ func TestBytesConversion(t *testing.T) {
t.Errorf("expected %x got %x", exp, hash)
}
}
+
+func TestHashJsonValidation(t *testing.T) {
+ var h Hash
+ var tests = []struct {
+ Prefix string
+ Size int
+ Error error
+ }{
+ {"", 2, hashJsonLengthErr},
+ {"", 62, hashJsonLengthErr},
+ {"", 66, hashJsonLengthErr},
+ {"", 65, hashJsonLengthErr},
+ {"0X", 64, nil},
+ {"0x", 64, nil},
+ {"0x", 62, hashJsonLengthErr},
+ }
+ for i, test := range tests {
+ if err := h.UnmarshalJSON(append([]byte(test.Prefix), make([]byte, test.Size)...)); err != test.Error {
+ t.Error(i, "expected", test.Error, "got", err)
+ }
+ }
+}