1 files changed, 369 insertions, 0 deletions
diff --git a/vendor/github.com/ethereum/go-ethereum/common/types.go b/vendor/github.com/ethereum/go-ethereum/common/types.go
new file mode 100644
index 000000000..98c83edd4
--- /dev/null
+++ b/vendor/github.com/ethereum/go-ethereum/common/types.go
@@ -0,0 +1,369 @@
+// Copyright 2015 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+package common
+
+import (
+	"database/sql/driver"
+	"encoding/hex"
+	"encoding/json"
+	"fmt"
+	"math/big"
+	"math/rand"
+	"reflect"
+	"strings"
+
+	"github.com/ethereum/go-ethereum/common/hexutil"
+	"golang.org/x/crypto/sha3"
+)
+
+// Lengths of hashes and addresses in bytes.
+const (
+	// HashLength is the expected length of the hash
+	HashLength = 32
+	// AddressLength is the expected length of the address
+	AddressLength = 20
+)
+
+var (
+	hashT    = reflect.TypeOf(Hash{})
+	addressT = reflect.TypeOf(Address{})
+)
+
+// Hash represents the 32 byte Keccak256 hash of arbitrary data.
+type Hash [HashLength]byte
+
+// BytesToHash sets b to hash.
+// If b is larger than len(h), b will be cropped from the left.
+func BytesToHash(b []byte) Hash {
+	var h Hash
+	h.SetBytes(b)
+	return h
+}
+
+// BigToHash sets byte representation of b to hash.
+// If b is larger than len(h), b will be cropped from the left.
+func BigToHash(b *big.Int) Hash { return BytesToHash(b.Bytes()) }
+
+// HexToHash sets byte representation of s to hash.
+// If b is larger than len(h), b will be cropped from the left.
+func HexToHash(s string) Hash { return BytesToHash(FromHex(s)) }
+
+// Bytes gets the byte representation of the underlying hash.
+func (h Hash) Bytes() []byte { return h[:] }
+
+// Big converts a hash to a big integer.
+func (h Hash) Big() *big.Int { return new(big.Int).SetBytes(h[:]) }
+
+// Hex converts a hash to a hex string.
+func (h Hash) Hex() string { return hexutil.Encode(h[:]) }
+
+// TerminalString implements log.TerminalStringer, formatting a string for console
+// output during logging.
+func (h Hash) TerminalString() string {
+	return fmt.Sprintf("%x…%x", h[:3], h[29:])
+}
+
+// String implements the stringer interface and is used also by the logger when
+// doing full logging into a file.
+func (h Hash) String() string {
+	return h.Hex()
+}
+
+// Format implements fmt.Formatter, forcing the byte slice to be formatted as is,
+// without going through the stringer interface used for logging.
+func (h Hash) Format(s fmt.State, c rune) {
+	fmt.Fprintf(s, "%"+string(c), h[:])
+}
+
+// UnmarshalText parses a hash in hex syntax.
+func (h *Hash) UnmarshalText(input []byte) error {
+	return hexutil.UnmarshalFixedText("Hash", input, h[:])
+}
+
+// UnmarshalJSON parses a hash in hex syntax.
+func (h *Hash) UnmarshalJSON(input []byte) error {
+	return hexutil.UnmarshalFixedJSON(hashT, input, h[:])
+}
+
+// MarshalText returns the hex representation of h.
+func (h Hash) MarshalText() ([]byte, error) {
+	return hexutil.Bytes(h[:]).MarshalText()
+}
+
+// SetBytes sets the hash to the value of b.
+// If b is larger than len(h), b will be cropped from the left.
+func (h *Hash) SetBytes(b []byte) {
+	if len(b) > len(h) {
+		b = b[len(b)-HashLength:]
+	}
+
+	copy(h[HashLength-len(b):], b)
+}
+
+// Generate implements testing/quick.Generator.
+func (h Hash) Generate(rand *rand.Rand, size int) reflect.Value {
+	m := rand.Intn(len(h))
+	for i := len(h) - 1; i > m; i-- {
+		h[i] = byte(rand.Uint32())
+	}
+	return reflect.ValueOf(h)
+}
+
+// Scan implements Scanner for database/sql.
+func (h *Hash) Scan(src interface{}) error {
+	srcB, ok := src.([]byte)
+	if !ok {
+		return fmt.Errorf("can't scan %T into Hash", src)
+	}
+	if len(srcB) != HashLength {
+		return fmt.Errorf("can't scan []byte of len %d into Hash, want %d", len(srcB), HashLength)
+	}
+	copy(h[:], srcB)
+	return nil
+}
+
+// Value implements valuer for database/sql.
+func (h Hash) Value() (driver.Value, error) {
+	return h[:], nil
+}
+
+// ImplementsGraphQLType returns true if Hash implements the specified GraphQL type.
+func (_ Hash) ImplementsGraphQLType(name string) bool { return name == "Bytes32" }
+
+// UnmarshalGraphQL unmarshals the provided GraphQL query data.
+func (h *Hash) UnmarshalGraphQL(input interface{}) error {
+	var err error
+	switch input := input.(type) {
+	case string:
+		*h = HexToHash(input)
+	default:
+		err = fmt.Errorf("Unexpected type for Bytes32: %v", input)
+	}
+	return err
+}
+
+// UnprefixedHash allows marshaling a Hash without 0x prefix.
+type UnprefixedHash Hash
+
+// UnmarshalText decodes the hash from hex. The 0x prefix is optional.
+func (h *UnprefixedHash) UnmarshalText(input []byte) error {
+	return hexutil.UnmarshalFixedUnprefixedText("UnprefixedHash", input, h[:])
+}
+
+// MarshalText encodes the hash as hex.
+func (h UnprefixedHash) MarshalText() ([]byte, error) {
+	return []byte(hex.EncodeToString(h[:])), nil
+}
+
+/////////// Address
+
+// Address represents the 20 byte address of an Ethereum account.
+type Address [AddressLength]byte
+
+// BytesToAddress returns Address with value b.
+// If b is larger than len(h), b will be cropped from the left.
+func BytesToAddress(b []byte) Address {
+	var a Address
+	a.SetBytes(b)
+	return a
+}
+
+// BigToAddress returns Address with byte values of b.
+// If b is larger than len(h), b will be cropped from the left.
+func BigToAddress(b *big.Int) Address { return BytesToAddress(b.Bytes()) }
+
+// HexToAddress returns Address with byte values of s.
+// If s is larger than len(h), s will be cropped from the left.
+func HexToAddress(s string) Address { return BytesToAddress(FromHex(s)) }
+
+// IsHexAddress verifies whether a string can represent a valid hex-encoded
+// Ethereum address or not.
+func IsHexAddress(s string) bool {
+	if hasHexPrefix(s) {
+		s = s[2:]
+	}
+	return len(s) == 2*AddressLength && isHex(s)
+}
+
+// Bytes gets the string representation of the underlying address.
+func (a Address) Bytes() []byte { return a[:] }
+
+// Hash converts an address to a hash by left-padding it with zeros.
+func (a Address) Hash() Hash { return BytesToHash(a[:]) }
+
+// Hex returns an EIP55-compliant hex string representation of the address.
+func (a Address) Hex() string {
+	unchecksummed := hex.EncodeToString(a[:])
+	sha := sha3.NewLegacyKeccak256()
+	sha.Write([]byte(unchecksummed))
+	hash := sha.Sum(nil)
+
+	result := []byte(unchecksummed)
+	for i := 0; i < len(result); i++ {
+		hashByte := hash[i/2]
+		if i%2 == 0 {
+			hashByte = hashByte >> 4
+		} else {
+			hashByte &= 0xf
+		}
+		if result[i] > '9' && hashByte > 7 {
+			result[i] -= 32
+		}
+	}
+	return "0x" + string(result)
+}
+
+// String implements fmt.Stringer.
+func (a Address) String() string {
+	return a.Hex()
+}
+
+// Format implements fmt.Formatter, forcing the byte slice to be formatted as is,
+// without going through the stringer interface used for logging.
+func (a Address) Format(s fmt.State, c rune) {
+	fmt.Fprintf(s, "%"+string(c), a[:])
+}
+
+// SetBytes sets the address to the value of b.
+// If b is larger than len(a) it will panic.
+func (a *Address) SetBytes(b []byte) {
+	if len(b) > len(a) {
+		b = b[len(b)-AddressLength:]
+	}
+	copy(a[AddressLength-len(b):], b)
+}
+
+// MarshalText returns the hex representation of a.
+func (a Address) MarshalText() ([]byte, error) {
+	return hexutil.Bytes(a[:]).MarshalText()
+}
+
+// UnmarshalText parses a hash in hex syntax.
+func (a *Address) UnmarshalText(input []byte) error {
+	return hexutil.UnmarshalFixedText("Address", input, a[:])
+}
+
+// UnmarshalJSON parses a hash in hex syntax.
+func (a *Address) UnmarshalJSON(input []byte) error {
+	return hexutil.UnmarshalFixedJSON(addressT, input, a[:])
+}
+
+// Scan implements Scanner for database/sql.
+func (a *Address) Scan(src interface{}) error {
+	srcB, ok := src.([]byte)
+	if !ok {
+		return fmt.Errorf("can't scan %T into Address", src)
+	}
+	if len(srcB) != AddressLength {
+		return fmt.Errorf("can't scan []byte of len %d into Address, want %d", len(srcB), AddressLength)
+	}
+	copy(a[:], srcB)
+	return nil
+}
+
+// Value implements valuer for database/sql.
+func (a Address) Value() (driver.Value, error) {
+	return a[:], nil
+}
+
+// ImplementsGraphQLType returns true if Hash implements the specified GraphQL type.
+func (a Address) ImplementsGraphQLType(name string) bool { return name == "Address" }
+
+// UnmarshalGraphQL unmarshals the provided GraphQL query data.
+func (a *Address) UnmarshalGraphQL(input interface{}) error {
+	var err error
+	switch input := input.(type) {
+	case string:
+		*a = HexToAddress(input)
+	default:
+		err = fmt.Errorf("Unexpected type for Address: %v", input)
+	}
+	return err
+}
+
+// UnprefixedAddress allows marshaling an Address without 0x prefix.
+type UnprefixedAddress Address
+
+// UnmarshalText decodes the address from hex. The 0x prefix is optional.
+func (a *UnprefixedAddress) UnmarshalText(input []byte) error {
+	return hexutil.UnmarshalFixedUnprefixedText("UnprefixedAddress", input, a[:])
+}
+
+// MarshalText encodes the address as hex.
+func (a UnprefixedAddress) MarshalText() ([]byte, error) {
+	return []byte(hex.EncodeToString(a[:])), nil
+}
+
+// MixedcaseAddress retains the original string, which may or may not be
+// correctly checksummed
+type MixedcaseAddress struct {
+	addr     Address
+	original string
+}
+
+// NewMixedcaseAddress constructor (mainly for testing)
+func NewMixedcaseAddress(addr Address) MixedcaseAddress {
+	return MixedcaseAddress{addr: addr, original: addr.Hex()}
+}
+
+// NewMixedcaseAddressFromString is mainly meant for unit-testing
+func NewMixedcaseAddressFromString(hexaddr string) (*MixedcaseAddress, error) {
+	if !IsHexAddress(hexaddr) {
+		return nil, fmt.Errorf("Invalid address")
+	}
+	a := FromHex(hexaddr)
+	return &MixedcaseAddress{addr: BytesToAddress(a), original: hexaddr}, nil
+}
+
+// UnmarshalJSON parses MixedcaseAddress
+func (ma *MixedcaseAddress) UnmarshalJSON(input []byte) error {
+	if err := hexutil.UnmarshalFixedJSON(addressT, input, ma.addr[:]); err != nil {
+		return err
+	}
+	return json.Unmarshal(input, &ma.original)
+}
+
+// MarshalJSON marshals the original value
+func (ma *MixedcaseAddress) MarshalJSON() ([]byte, error) {
+	if strings.HasPrefix(ma.original, "0x") || strings.HasPrefix(ma.original, "0X") {
+		return json.Marshal(fmt.Sprintf("0x%s", ma.original[2:]))
+	}
+	return json.Marshal(fmt.Sprintf("0x%s", ma.original))
+}
+
+// Address returns the address
+func (ma *MixedcaseAddress) Address() Address {
+	return ma.addr
+}
+
+// String implements fmt.Stringer
+func (ma *MixedcaseAddress) String() string {
+	if ma.ValidChecksum() {
+		return fmt.Sprintf("%s [chksum ok]", ma.original)
+	}
+	return fmt.Sprintf("%s [chksum INVALID]", ma.original)
+}
+
+// ValidChecksum returns true if the address has valid checksum
+func (ma *MixedcaseAddress) ValidChecksum() bool {
+	return ma.original == ma.addr.Hex()
+}
+
+// Original returns the mixed-case input string
+func (ma *MixedcaseAddress) Original() string {
+	return ma.original
+}