go/staking/api: Add Address for representing staking account addresses

go/staking/api/address.go

@@ -0,0 +1,64 @@
+package api
+
+import (
+	"github.com/oasisprotocol/oasis-core/go/common/crypto/address"
+	"github.com/oasisprotocol/oasis-core/go/common/crypto/signature"
+	"github.com/oasisprotocol/oasis-core/go/common/encoding/bech32"
+)
+
+// Human readable part of Bech32 encoded addresses.
+const Bech32HRP = "osa"
+
+var (
+	// Context is the unique context for staking account addresses.
+	Context = address.NewContext("oasis-core/address: staking")
+	// Version is the unique address version.
+	Version = address.NewVersion(0)
+)
+
+// Address is the staking account address.
+type Address address.Address
+
+// MarshalBinary encodes an address into binary form.
+func (a Address) MarshalBinary() ([]byte, error) {
+	return (address.Address)(a).MarshalBinary()
+}
+
+// UnMarshalBinary decodes a binary marshaled address.
+func (a *Address) UnmarshalBinary(data []byte) error {
+	return (*address.Address)(a).UnmarshalBinary(data)
+}
+
+// MarshalText encodes an address into text form.
+func (a Address) MarshalText() ([]byte, error) {
+	return (address.Address)(a).MarshalBech32(Bech32HRP)
+}
+
+// UnmarshalText decodes a text marshaled address.
+func (a *Address) UnmarshalText(text []byte) error {
+	return (*address.Address)(a).UnmarshalBech32(Bech32HRP, text)
+}
+
+// Equal compares vs another address for equality.
+func (a Address) Equal(cmp Address) bool {
+	return (address.Address)(a).Equal((address.Address)(cmp))
+}
+
+// String returns the string representation of an address.
+func (a Address) String() string {
+	bech32Addr, err := bech32.Encode(Bech32HRP, a[:])
+	if err != nil {
+		return "[malformed]"
+	}
+	return bech32Addr
+}
+
+func (a Address) IsValid() bool {
+	return address.Address(a).IsValid()
+}
+
+// NewFromPublicKey creates a new address from an entity's id / public key.
+func NewFromPublicKey(pk signature.PublicKey) (a Address) {
+	pkData, _ := pk.MarshalBinary()
+	return (Address)(address.NewAddress(Version, Context, pkData))
+}