internal/ethapi: add personal_sign method

console/bridge.go

@@ -126,6 +126,44 @@ func (b *bridge) UnlockAccount(call otto.FunctionCall) (response otto.Value) {
 	return val
 }
 
+// Sign is a wrapper around the personal.sign RPC method that uses a non-echoing password
+// prompt to aquire the passphrase and executes the original RPC method (saved in
+// jeth.sign) with it to actually execute the RPC call.
+func (b *bridge) Sign(call otto.FunctionCall) (response otto.Value) {
+	var (
+		hash    = call.Argument(0)
+		account = call.Argument(1)
+		passwd  = call.Argument(2)
+	)
+
+	if !hash.IsString() {
+		throwJSException("first argument must be the hash to sign")
+	}
+	if !account.IsString() {
+		throwJSException("second argument must be the account to sign with")
+	}
+
+	// if the password is not given or null ask the user, otherwise ensure it's a string
+	if passwd.IsUndefined() || passwd.IsNull() {
+		fmt.Fprintf(b.printer, "Give password for account %s\n", account)
+		if input, err := b.prompter.PromptPassword("Passphrase: "); err != nil {
+			throwJSException(err.Error())
+		} else {
+			passwd, _ = otto.ToValue(input)
+		}
+	}
+	if !passwd.IsString() {
+		throwJSException("third argument must be the password to unlock the account")
+	}
+
+	// Send the request to the backend and return
+	val, err := call.Otto.Call("jeth.sign", nil, hash, account, passwd)
+	if err != nil {
+		throwJSException(err.Error())
+	}
+	return val
+}
+
 // Sleep will block the console for the specified number of seconds.
 func (b *bridge) Sleep(call otto.FunctionCall) (response otto.Value) {
 	if call.Argument(0).IsNumber() {

console/console.go

@@ -156,10 +156,9 @@ func (c *Console) init(preload []string) error {
 		if err != nil {
 			return err
 		}
-		// Override the unlockAccount and newAccount methods since these require user interaction.
-		// Assign the jeth.unlockAccount and jeth.newAccount in the Console the original web3 callbacks.
-		// These will be called by the jeth.* methods after they got the password from the user and send
-		// the original web3 request to the backend.
+		// Override the unlockAccount, newAccount and sign methods since these require user interaction.
+		// Assign these method in the Console the original web3 callbacks. These will be called by the jeth.*
+		// methods after they got the password from the user and send the original web3 request to the backend.
 		if obj := personal.Object(); obj != nil { // make sure the personal api is enabled over the interface
 			if _, err = c.jsre.Run(`jeth.unlockAccount = personal.unlockAccount;`); err != nil {
 				return fmt.Errorf("personal.unlockAccount: %v", err)
@@ -167,8 +166,12 @@ func (c *Console) init(preload []string) error {
 			if _, err = c.jsre.Run(`jeth.newAccount = personal.newAccount;`); err != nil {
 				return fmt.Errorf("personal.newAccount: %v", err)
 			}
+			if _, err = c.jsre.Run(`jeth.sign = personal.sign;`); err != nil {
+				return fmt.Errorf("personal.sign: %v", err)
+			}
 			obj.Set("unlockAccount", bridge.UnlockAccount)
 			obj.Set("newAccount", bridge.NewAccount)
+			obj.Set("sign", bridge.Sign)
 		}
 	}
 	// The admin.sleep and admin.sleepBlocks are offered by the console and not by the RPC layer.

internal/ethapi/api.go

@@ -298,6 +298,16 @@ func (s *PrivateAccountAPI) SendTransaction(ctx context.Context, args SendTxArgs
 	return submitTransaction(ctx, s.b, tx, signature)
 }
 
+// Sign decrypts the private key associated with the given address with the given password.
+// If the key was successful decrypted the given hash is signed and the signature is returned.
+func (s *PrivateAccountAPI) Sign(ctx context.Context, hash common.Hash, addr common.Address, passwd string) (string, error) {
+	signature, err := s.b.AccountManager().SignWithPassphrase(addr, passwd, hash.Bytes())
+	if err != nil {
+		return "0x", err
+	}
+	return "0x" + hex.EncodeToString(signature), nil
+}
+
 // SignAndSendTransaction was renamed to SendTransaction. This method is deprecated
 // and will be removed in the future. It primary goal is to give clients time to update.
 func (s *PrivateAccountAPI) SignAndSendTransaction(ctx context.Context, args SendTxArgs, passwd string) (common.Hash, error) {

internal/web3ext/web3ext.go

@@ -428,6 +428,12 @@ web3._extend({
 			call: 'personal_sendTransaction',
 			params: 2,
 			inputFormatter: [web3._extend.formatters.inputTransactionFormatter, null]
+		}),
+		new web3._extend.Method({
+			name: 'sign',
+			call: 'personal_sign',
+			params: 3,
+			inputFormatter: [null, web3._extend.formatters.inputAddressFormatter, null]
 		})
 	]
 });