signer: fix golint errors (#16653)

* signer/*: golint fixes

Specifically naming and comment formatting for documentation

* signer/*: fixed naming error crashing build

* signer/*: corrected error

* signer/core: fix tiny error whitespace

* signer/rules: fix test refactor

8 files changed, 78 insertions, 79 deletions

diff --git a/signer/core/abihelper.go b/signer/core/abihelper.go
index 2674c7346..1d4fbc7dc 100644
--- a/signer/core/abihelper.go
+++ b/signer/core/abihelper.go
@@ -94,13 +94,12 @@ func parseCallData(calldata []byte, abidata string) (*decodedCallData, error) {
 	for n, argument := range method.Inputs {
 		if err != nil {
 			return nil, fmt.Errorf("Failed to decode argument %d (signature %v): %v", n, method.Sig(), err)
-		} else {
-			decodedArg := decodedArgument{
-				soltype: argument,
-				value:   v[n],
-			}
-			decoded.inputs = append(decoded.inputs, decodedArg)
 		}
+		decodedArg := decodedArgument{
+			soltype: argument,
+			value:   v[n],
+		}
+		decoded.inputs = append(decoded.inputs, decodedArg)
 	}
 
 	// We're finished decoding the data. At this point, we encode the decoded data to see if it matches with the
@@ -240,7 +239,7 @@ func (db *AbiDb) saveCustomAbi(selector, signature string) error {
 	return err
 }
 
-// Adds a signature to the database, if custom database saving is enabled.
+// AddSignature to the database, if custom database saving is enabled.
 // OBS: This method does _not_ validate the correctness of the data,
 // it is assumed that the caller has already done so
 func (db *AbiDb) AddSignature(selector string, data []byte) error {
diff --git a/signer/core/api.go b/signer/core/api.go
index 1387041cc..45933284b 100644
--- a/signer/core/api.go
+++ b/signer/core/api.go
@@ -474,7 +474,7 @@ func (api *SignerAPI) Export(ctx context.Context, addr common.Address) (json.Raw
 	return ioutil.ReadFile(wallet.URL().Path)
 }
 
-// Imports tries to import the given keyJSON in the local keystore. The keyJSON data is expected to be
+// Import tries to import the given keyJSON in the local keystore. The keyJSON data is expected to be
 // in web3 keystore format. It will decrypt the keyJSON with the given passphrase and on successful
 // decryption it will encrypt the key with the given newPassphrase and store it in the keystore.
 func (api *SignerAPI) Import(ctx context.Context, keyJSON json.RawMessage) (Account, error) {
diff --git a/signer/core/cliui.go b/signer/core/cliui.go
index 0d9b5f3d3..2f969669c 100644
--- a/signer/core/cliui.go
+++ b/signer/core/cliui.go
@@ -13,6 +13,7 @@
 //
 // You should have received a copy of the GNU General Public License
 // along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
+
 package core
 
 import (
diff --git a/signer/core/types.go b/signer/core/types.go
index 8386bd44e..2acc0a4f4 100644
--- a/signer/core/types.go
+++ b/signer/core/types.go
@@ -73,8 +73,8 @@ type SendTxArgs struct {
 	Input *hexutil.Bytes `json:"input"`
 }
 
-func (t SendTxArgs) String() string {
-	s, err := json.Marshal(t)
+func (args SendTxArgs) String() string {
+	s, err := json.Marshal(args)
 	if err == nil {
 		return string(s)
 	}
diff --git a/signer/core/validation.go b/signer/core/validation.go
index 97bb3b685..288456df8 100644
--- a/signer/core/validation.go
+++ b/signer/core/validation.go
@@ -128,7 +128,7 @@ func (v *Validator) validate(msgs *ValidationMessages, txargs *SendTxArgs, metho
 		if len(data) == 0 {
 			if txargs.Value.ToInt().Cmp(big.NewInt(0)) > 0 {
 				// Sending ether into black hole
-				return errors.New(`Tx will create contract with value but empty code!`)
+				return errors.New("Tx will create contract with value but empty code!")
 			}
 			// No value submitted at least
 			msgs.crit("Tx will create contract with empty code!")
diff --git a/signer/rules/rules.go b/signer/rules/rules.go
index fa270436d..711e2ddde 100644
--- a/signer/rules/rules.go
+++ b/signer/rules/rules.go
@@ -46,17 +46,17 @@ func consoleOutput(call otto.FunctionCall) otto.Value {
 	return otto.Value{}
 }
 
-// rulesetUi provides an implementation of SignerUI that evaluates a javascript
+// rulesetUI provides an implementation of SignerUI that evaluates a javascript
 // file for each defined UI-method
-type rulesetUi struct {
+type rulesetUI struct {
 	next        core.SignerUI // The next handler, for manual processing
 	storage     storage.Storage
 	credentials storage.Storage
 	jsRules     string // The rules to use
 }
 
-func NewRuleEvaluator(next core.SignerUI, jsbackend, credentialsBackend storage.Storage) (*rulesetUi, error) {
-	c := &rulesetUi{
+func NewRuleEvaluator(next core.SignerUI, jsbackend, credentialsBackend storage.Storage) (*rulesetUI, error) {
+	c := &rulesetUI{
 		next:        next,
 		storage:     jsbackend,
 		credentials: credentialsBackend,
@@ -66,11 +66,11 @@ func NewRuleEvaluator(next core.SignerUI, jsbackend, credentialsBackend storage.
 	return c, nil
 }
 
-func (r *rulesetUi) Init(javascriptRules string) error {
+func (r *rulesetUI) Init(javascriptRules string) error {
 	r.jsRules = javascriptRules
 	return nil
 }
-func (r *rulesetUi) execute(jsfunc string, jsarg interface{}) (otto.Value, error) {
+func (r *rulesetUI) execute(jsfunc string, jsarg interface{}) (otto.Value, error) {
 
 	// Instantiate a fresh vm engine every time
 	vm := otto.New()
@@ -115,7 +115,7 @@ func (r *rulesetUi) execute(jsfunc string, jsarg interface{}) (otto.Value, error
 	return vm.Run(call)
 }
 
-func (r *rulesetUi) checkApproval(jsfunc string, jsarg []byte, err error) (bool, error) {
+func (r *rulesetUI) checkApproval(jsfunc string, jsarg []byte, err error) (bool, error) {
 	if err != nil {
 		return false, err
 	}
@@ -139,7 +139,7 @@ func (r *rulesetUi) checkApproval(jsfunc string, jsarg []byte, err error) (bool,
 	return false, fmt.Errorf("Unknown response")
 }
 
-func (r *rulesetUi) ApproveTx(request *core.SignTxRequest) (core.SignTxResponse, error) {
+func (r *rulesetUI) ApproveTx(request *core.SignTxRequest) (core.SignTxResponse, error) {
 	jsonreq, err := json.Marshal(request)
 	approved, err := r.checkApproval("ApproveTx", jsonreq, err)
 	if err != nil {
@@ -158,11 +158,11 @@ func (r *rulesetUi) ApproveTx(request *core.SignTxRequest) (core.SignTxResponse,
 	return core.SignTxResponse{Approved: false}, err
 }
 
-func (r *rulesetUi) lookupPassword(address common.Address) string {
+func (r *rulesetUI) lookupPassword(address common.Address) string {
 	return r.credentials.Get(strings.ToLower(address.String()))
 }
 
-func (r *rulesetUi) ApproveSignData(request *core.SignDataRequest) (core.SignDataResponse, error) {
+func (r *rulesetUI) ApproveSignData(request *core.SignDataRequest) (core.SignDataResponse, error) {
 	jsonreq, err := json.Marshal(request)
 	approved, err := r.checkApproval("ApproveSignData", jsonreq, err)
 	if err != nil {
@@ -175,7 +175,7 @@ func (r *rulesetUi) ApproveSignData(request *core.SignDataRequest) (core.SignDat
 	return core.SignDataResponse{Approved: false, Password: ""}, err
 }
 
-func (r *rulesetUi) ApproveExport(request *core.ExportRequest) (core.ExportResponse, error) {
+func (r *rulesetUI) ApproveExport(request *core.ExportRequest) (core.ExportResponse, error) {
 	jsonreq, err := json.Marshal(request)
 	approved, err := r.checkApproval("ApproveExport", jsonreq, err)
 	if err != nil {
@@ -188,13 +188,13 @@ func (r *rulesetUi) ApproveExport(request *core.ExportRequest) (core.ExportRespo
 	return core.ExportResponse{Approved: false}, err
 }
 
-func (r *rulesetUi) ApproveImport(request *core.ImportRequest) (core.ImportResponse, error) {
+func (r *rulesetUI) ApproveImport(request *core.ImportRequest) (core.ImportResponse, error) {
 	// This cannot be handled by rules, requires setting a password
 	// dispatch to next
 	return r.next.ApproveImport(request)
 }
 
-func (r *rulesetUi) ApproveListing(request *core.ListRequest) (core.ListResponse, error) {
+func (r *rulesetUI) ApproveListing(request *core.ListRequest) (core.ListResponse, error) {
 	jsonreq, err := json.Marshal(request)
 	approved, err := r.checkApproval("ApproveListing", jsonreq, err)
 	if err != nil {
@@ -207,22 +207,22 @@ func (r *rulesetUi) ApproveListing(request *core.ListRequest) (core.ListResponse
 	return core.ListResponse{}, err
 }
 
-func (r *rulesetUi) ApproveNewAccount(request *core.NewAccountRequest) (core.NewAccountResponse, error) {
+func (r *rulesetUI) ApproveNewAccount(request *core.NewAccountRequest) (core.NewAccountResponse, error) {
 	// This cannot be handled by rules, requires setting a password
 	// dispatch to next
 	return r.next.ApproveNewAccount(request)
 }
 
-func (r *rulesetUi) ShowError(message string) {
+func (r *rulesetUI) ShowError(message string) {
 	log.Error(message)
 	r.next.ShowError(message)
 }
 
-func (r *rulesetUi) ShowInfo(message string) {
+func (r *rulesetUI) ShowInfo(message string) {
 	log.Info(message)
 	r.next.ShowInfo(message)
 }
-func (r *rulesetUi) OnSignerStartup(info core.StartupInfo) {
+func (r *rulesetUI) OnSignerStartup(info core.StartupInfo) {
 	jsonInfo, err := json.Marshal(info)
 	if err != nil {
 		log.Warn("failed marshalling data", "data", info)
@@ -235,7 +235,7 @@ func (r *rulesetUi) OnSignerStartup(info core.StartupInfo) {
 	}
 }
 
-func (r *rulesetUi) OnApprovedTx(tx ethapi.SignTransactionResult) {
+func (r *rulesetUI) OnApprovedTx(tx ethapi.SignTransactionResult) {
 	jsonTx, err := json.Marshal(tx)
 	if err != nil {
 		log.Warn("failed marshalling transaction", "tx", tx)
diff --git a/signer/rules/rules_test.go b/signer/rules/rules_test.go
index 6a0403500..b6060eba7 100644
--- a/signer/rules/rules_test.go
+++ b/signer/rules/rules_test.go
@@ -33,18 +33,18 @@ import (
 
 const JS = `
 /**
-This is an example implementation of a Javascript rule file. 
+This is an example implementation of a Javascript rule file.
 
-When the signer receives a request over the external API, the corresponding method is evaluated. 
-Three things can happen: 
+When the signer receives a request over the external API, the corresponding method is evaluated.
+Three things can happen:
 
-1. The method returns "Approve". This means the operation is permitted. 
-2. The method returns "Reject". This means the operation is rejected. 
+1. The method returns "Approve". This means the operation is permitted.
+2. The method returns "Reject". This means the operation is rejected.
 3. Anything else; other return values [*], method not implemented or exception occurred during processing. This means
-that the operation will continue to manual processing, via the regular UI method chosen by the user. 
+that the operation will continue to manual processing, via the regular UI method chosen by the user.
 
-[*] Note: Future version of the ruleset may use more complex json-based returnvalues, making it possible to not 
-only respond Approve/Reject/Manual, but also modify responses. For example, choose to list only one, but not all 
+[*] Note: Future version of the ruleset may use more complex json-based returnvalues, making it possible to not
+only respond Approve/Reject/Manual, but also modify responses. For example, choose to list only one, but not all
 accounts in a list-request. The points above will continue to hold for non-json based responses ("Approve"/"Reject").
 
 **/
@@ -72,49 +72,49 @@ func mixAddr(a string) (*common.MixedcaseAddress, error) {
 	return common.NewMixedcaseAddressFromString(a)
 }
 
-type alwaysDenyUi struct{}
+type alwaysDenyUI struct{}
 
-func (alwaysDenyUi) OnSignerStartup(info core.StartupInfo) {
+func (alwaysDenyUI) OnSignerStartup(info core.StartupInfo) {
 }
 
-func (alwaysDenyUi) ApproveTx(request *core.SignTxRequest) (core.SignTxResponse, error) {
+func (alwaysDenyUI) ApproveTx(request *core.SignTxRequest) (core.SignTxResponse, error) {
 	return core.SignTxResponse{Transaction: request.Transaction, Approved: false, Password: ""}, nil
 }
 
-func (alwaysDenyUi) ApproveSignData(request *core.SignDataRequest) (core.SignDataResponse, error) {
+func (alwaysDenyUI) ApproveSignData(request *core.SignDataRequest) (core.SignDataResponse, error) {
 	return core.SignDataResponse{Approved: false, Password: ""}, nil
 }
 
-func (alwaysDenyUi) ApproveExport(request *core.ExportRequest) (core.ExportResponse, error) {
+func (alwaysDenyUI) ApproveExport(request *core.ExportRequest) (core.ExportResponse, error) {
 	return core.ExportResponse{Approved: false}, nil
 }
 
-func (alwaysDenyUi) ApproveImport(request *core.ImportRequest) (core.ImportResponse, error) {
+func (alwaysDenyUI) ApproveImport(request *core.ImportRequest) (core.ImportResponse, error) {
 	return core.ImportResponse{Approved: false, OldPassword: "", NewPassword: ""}, nil
 }
 
-func (alwaysDenyUi) ApproveListing(request *core.ListRequest) (core.ListResponse, error) {
+func (alwaysDenyUI) ApproveListing(request *core.ListRequest) (core.ListResponse, error) {
 	return core.ListResponse{Accounts: nil}, nil
 }
 
-func (alwaysDenyUi) ApproveNewAccount(request *core.NewAccountRequest) (core.NewAccountResponse, error) {
+func (alwaysDenyUI) ApproveNewAccount(request *core.NewAccountRequest) (core.NewAccountResponse, error) {
 	return core.NewAccountResponse{Approved: false, Password: ""}, nil
 }
 
-func (alwaysDenyUi) ShowError(message string) {
+func (alwaysDenyUI) ShowError(message string) {
 	panic("implement me")
 }
 
-func (alwaysDenyUi) ShowInfo(message string) {
+func (alwaysDenyUI) ShowInfo(message string) {
 	panic("implement me")
 }
 
-func (alwaysDenyUi) OnApprovedTx(tx ethapi.SignTransactionResult) {
+func (alwaysDenyUI) OnApprovedTx(tx ethapi.SignTransactionResult) {
 	panic("implement me")
 }
 
-func initRuleEngine(js string) (*rulesetUi, error) {
-	r, err := NewRuleEvaluator(&alwaysDenyUi{}, storage.NewEphemeralStorage(), storage.NewEphemeralStorage())
+func initRuleEngine(js string) (*rulesetUI, error) {
+	r, err := NewRuleEvaluator(&alwaysDenyUI{}, storage.NewEphemeralStorage(), storage.NewEphemeralStorage())
 	if err != nil {
 		return nil, fmt.Errorf("failed to create js engine: %v", err)
 	}
@@ -196,59 +196,59 @@ func TestSignTxRequest(t *testing.T) {
 	}
 }
 
-type dummyUi struct {
+type dummyUI struct {
 	calls []string
 }
 
-func (d *dummyUi) ApproveTx(request *core.SignTxRequest) (core.SignTxResponse, error) {
+func (d *dummyUI) ApproveTx(request *core.SignTxRequest) (core.SignTxResponse, error) {
 	d.calls = append(d.calls, "ApproveTx")
 	return core.SignTxResponse{}, core.ErrRequestDenied
 }
 
-func (d *dummyUi) ApproveSignData(request *core.SignDataRequest) (core.SignDataResponse, error) {
+func (d *dummyUI) ApproveSignData(request *core.SignDataRequest) (core.SignDataResponse, error) {
 	d.calls = append(d.calls, "ApproveSignData")
 	return core.SignDataResponse{}, core.ErrRequestDenied
 }
 
-func (d *dummyUi) ApproveExport(request *core.ExportRequest) (core.ExportResponse, error) {
+func (d *dummyUI) ApproveExport(request *core.ExportRequest) (core.ExportResponse, error) {
 	d.calls = append(d.calls, "ApproveExport")
 	return core.ExportResponse{}, core.ErrRequestDenied
 }
 
-func (d *dummyUi) ApproveImport(request *core.ImportRequest) (core.ImportResponse, error) {
+func (d *dummyUI) ApproveImport(request *core.ImportRequest) (core.ImportResponse, error) {
 	d.calls = append(d.calls, "ApproveImport")
 	return core.ImportResponse{}, core.ErrRequestDenied
 }
 
-func (d *dummyUi) ApproveListing(request *core.ListRequest) (core.ListResponse, error) {
+func (d *dummyUI) ApproveListing(request *core.ListRequest) (core.ListResponse, error) {
 	d.calls = append(d.calls, "ApproveListing")
 	return core.ListResponse{}, core.ErrRequestDenied
 }
 
-func (d *dummyUi) ApproveNewAccount(request *core.NewAccountRequest) (core.NewAccountResponse, error) {
+func (d *dummyUI) ApproveNewAccount(request *core.NewAccountRequest) (core.NewAccountResponse, error) {
 	d.calls = append(d.calls, "ApproveNewAccount")
 	return core.NewAccountResponse{}, core.ErrRequestDenied
 }
 
-func (d *dummyUi) ShowError(message string) {
+func (d *dummyUI) ShowError(message string) {
 	d.calls = append(d.calls, "ShowError")
 }
 
-func (d *dummyUi) ShowInfo(message string) {
+func (d *dummyUI) ShowInfo(message string) {
 	d.calls = append(d.calls, "ShowInfo")
 }
 
-func (d *dummyUi) OnApprovedTx(tx ethapi.SignTransactionResult) {
+func (d *dummyUI) OnApprovedTx(tx ethapi.SignTransactionResult) {
 	d.calls = append(d.calls, "OnApprovedTx")
 }
-func (d *dummyUi) OnSignerStartup(info core.StartupInfo) {
+func (d *dummyUI) OnSignerStartup(info core.StartupInfo) {
 }
 
 //TestForwarding tests that the rule-engine correctly dispatches requests to the next caller
 func TestForwarding(t *testing.T) {
 
 	js := ""
-	ui := &dummyUi{make([]string, 0)}
+	ui := &dummyUI{make([]string, 0)}
 	jsBackend := storage.NewEphemeralStorage()
 	credBackend := storage.NewEphemeralStorage()
 	r, err := NewRuleEvaluator(ui, jsBackend, credBackend)
@@ -308,22 +308,22 @@ func TestStorage(t *testing.T) {
 	function testStorage(){
 		storage.Put("mykey", "myvalue")
 		a = storage.Get("mykey")
-		
+
 		storage.Put("mykey", ["a", "list"])  	// Should result in "a,list"
 		a += storage.Get("mykey")
 
-		
+
 		storage.Put("mykey", {"an": "object"}) 	// Should result in "[object Object]"
 		a += storage.Get("mykey")
 
-		
+
 		storage.Put("mykey", JSON.stringify({"an": "object"})) // Should result in '{"an":"object"}'
 		a += storage.Get("mykey")
 
 		a += storage.Get("missingkey")		//Missing keys should result in empty string
 		storage.Put("","missing key==noop") // Can't store with 0-length key
 		a += storage.Get("")				// Should result in ''
-		
+
 		var b = new BigNumber(2)
 		var c = new BigNumber(16)//"0xf0",16)
 		var d = b.plus(c)
@@ -361,7 +361,7 @@ const ExampleTxWindow = `
 		if(str.slice(0,2) == "0x"){ return new BigNumber(str.slice(2),16)}
 		return new BigNumber(str)
 	}
-	
+
 	// Time window: 1 week
 	var window = 1000* 3600*24*7;
 
@@ -370,7 +370,7 @@ const ExampleTxWindow = `
 
 	function isLimitOk(transaction){
 		var value = big(transaction.value)
-		// Start of our window function		
+		// Start of our window function
 		var windowstart = new Date().getTime() - window;
 
 		var txs = [];
@@ -382,17 +382,17 @@ const ExampleTxWindow = `
 		// First, remove all that have passed out of the time-window
 		var newtxs = txs.filter(function(tx){return tx.tstamp > windowstart});
 		console.log(txs, newtxs.length);
-	
+
 		// Secondly, aggregate the current sum
 		sum = new BigNumber(0)
 
 		sum = newtxs.reduce(function(agg, tx){ return big(tx.value).plus(agg)}, sum);
 		console.log("ApproveTx > Sum so far", sum);
 		console.log("ApproveTx > Requested", value.toNumber());
-		
+
 		// Would we exceed weekly limit ?
 		return sum.plus(value).lt(limit)
-		
+
 	}
 	function ApproveTx(r){
 		console.log(r)
@@ -405,14 +405,14 @@ const ExampleTxWindow = `
 
 	/**
 	* OnApprovedTx(str) is called when a transaction has been approved and signed. The parameter
- 	* 'response_str' contains the return value that will be sent to the external caller. 
-	* The return value from this method is ignore - the reason for having this callback is to allow the 
-	* ruleset to keep track of approved transactions. 
+ 	* 'response_str' contains the return value that will be sent to the external caller.
+	* The return value from this method is ignore - the reason for having this callback is to allow the
+	* ruleset to keep track of approved transactions.
 	*
-	* When implementing rate-limited rules, this callback should be used. 
+	* When implementing rate-limited rules, this callback should be used.
 	* If a rule responds with neither 'Approve' nor 'Reject' - the tx goes to manual processing. If the user
 	* then accepts the transaction, this method will be called.
-	* 
+	*
 	* TLDR; Use this method to keep track of signed transactions, instead of using the data in ApproveTx.
 	*/
  	function OnApprovedTx(resp){
diff --git a/signer/storage/aes_gcm_storage.go b/signer/storage/aes_gcm_storage.go
index 1ac347558..225276667 100644
--- a/signer/storage/aes_gcm_storage.go
+++ b/signer/storage/aes_gcm_storage.go
@@ -14,6 +14,7 @@
 // You should have received a copy of the GNU General Public License
 // along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
 //
+
 package storage
 
 import (
@@ -106,10 +107,8 @@ func (s *AESEncryptedStorage) readEncryptedStorage() (map[string]storedCredentia
 		if os.IsNotExist(err) {
 			// Doesn't exist yet
 			return creds, nil
-
-		} else {
-			log.Warn("Failed to read encrypted storage", "err", err, "file", s.filename)
 		}
+		log.Warn("Failed to read encrypted storage", "err", err, "file", s.filename)
 	}
 	if err = json.Unmarshal(raw, &creds); err != nil {
 		log.Warn("Failed to unmarshal encrypted storage", "err", err, "file", s.filename)