core

package
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 Go to latest Published: Feb 13, 2020 License: GPL-3.0 Imports: 27 Imported by: 0

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Index

Constants

This section is empty.

Variables

View Source 
var ErrRequestDenied = errors.New("Request denied")

Functions

func MethodSelectorToAbi 

func MethodSelectorToAbi(selector string) ([]byte, error)

MethodSelectorToAbi converts a method selector into an ABI struct. The returned data is a valid json string which can be consumed by the standard abi package.

func SignHash 

func SignHash(data []byte) ([]byte, string)

SignHash is a helper function that calculates a hash for the given message that can be safely used to calculate a signature from.

The hash is calculated as 

keccak256("\x19Ethereum Signed Message:\n"${message length}${message}).

This gives context to the signed message and prevents signing of transactions.

Types

type AbiDb 

type AbiDb struct {
	// contains filtered or unexported fields
}

func NewAbiDBFromFile 

func NewAbiDBFromFile(path string) (*AbiDb, error)

NewAbiDBFromFile loads signature database from file, and errors if the file is not valid json. Does no other validation of contents

func NewAbiDBFromFiles 

func NewAbiDBFromFiles(standard, custom string) (*AbiDb, error)

NewAbiDBFromFiles loads both the standard signature database and a custom database. The latter will be used to write new values into if they are submitted via the API

func NewEmptyAbiDB 

func NewEmptyAbiDB() (*AbiDb, error)

NewEmptyAbiDB exists for test purposes

func (*AbiDb) AddSignature 

func (db *AbiDb) AddSignature(selector string, data []byte) error

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 (*AbiDb) LookupMethodSelector 

func (db *AbiDb) LookupMethodSelector(id []byte) (string, error)

LookupMethodSelector checks the given 4byte-sequence against the known ABI methods. OBS: This method does not validate the match, it's assumed the caller will do so

func (*AbiDb) Size 

func (db *AbiDb) Size() int

type Account 

type Account struct {
	Typ     string         `json:"type"`
	URL     accounts.URL   `json:"url"`
	Address common.Address `json:"address"`
}

func (Account) String 

func (a Account) String() string

type Accounts 

type Accounts []Account

func (Accounts) String 

func (as Accounts) String() string

type AuditLogger 

type AuditLogger struct {
	// contains filtered or unexported fields
}

func NewAuditLogger 

func NewAuditLogger(path string, api ExternalAPI) (*AuditLogger, error)

func (*AuditLogger) EcRecover 

func (l *AuditLogger) EcRecover(ctx context.Context, data, sig hexutil.Bytes) (common.Address, error)

func (*AuditLogger) Export 

func (l *AuditLogger) Export(ctx context.Context, addr common.Address) (json.RawMessage, error)

func (*AuditLogger) Import 

func (l *AuditLogger) Import(ctx context.Context, keyJSON json.RawMessage) (Account, error)

func (*AuditLogger) List 

func (l *AuditLogger) List(ctx context.Context) (Accounts, error)

func (*AuditLogger) New 

func (l *AuditLogger) New(ctx context.Context) (accounts.Account, error)

func (*AuditLogger) Sign 

func (l *AuditLogger) Sign(ctx context.Context, addr common.MixedcaseAddress, data hexutil.Bytes) (hexutil.Bytes, error)

func (*AuditLogger) SignTransaction 

func (l *AuditLogger) SignTransaction(ctx context.Context, args SendTxArgs, methodSelector *string) (*trueapi.SignTransactionResult, error)

type CommandlineUI 

type CommandlineUI struct {
	// contains filtered or unexported fields
}

func NewCommandlineUI 

func NewCommandlineUI() *CommandlineUI

func (*CommandlineUI) ApproveExport 

func (ui *CommandlineUI) ApproveExport(request *ExportRequest) (ExportResponse, error)

ApproveExport prompt the user for confirmation to export encrypted Account json

func (*CommandlineUI) ApproveImport 

func (ui *CommandlineUI) ApproveImport(request *ImportRequest) (ImportResponse, error)

ApproveImport prompt the user for confirmation to import Account json

func (*CommandlineUI) ApproveListing 

func (ui *CommandlineUI) ApproveListing(request *ListRequest) (ListResponse, error)

ApproveListing prompt the user for confirmation to list accounts the list of accounts to list can be modified by the UI

func (*CommandlineUI) ApproveNewAccount 

func (ui *CommandlineUI) ApproveNewAccount(request *NewAccountRequest) (NewAccountResponse, error)

ApproveNewAccount prompt the user for confirmation to create new Account, and reveal to caller

func (*CommandlineUI) ApproveSignData 

func (ui *CommandlineUI) ApproveSignData(request *SignDataRequest) (SignDataResponse, error)

ApproveSignData prompt the user for confirmation to request to sign data

func (*CommandlineUI) ApproveTx 

func (ui *CommandlineUI) ApproveTx(request *SignTxRequest) (SignTxResponse, error)

ApproveTx prompt the user for confirmation to request to sign Transaction

func (*CommandlineUI) OnApprovedTx 

func (ui *CommandlineUI) OnApprovedTx(tx trueapi.SignTransactionResult)

func (*CommandlineUI) OnSignerStartup 

func (ui *CommandlineUI) OnSignerStartup(info StartupInfo)

func (*CommandlineUI) ShowError 

func (ui *CommandlineUI) ShowError(message string)

ShowError displays error message to user

func (*CommandlineUI) ShowInfo 

func (ui *CommandlineUI) ShowInfo(message string)

ShowInfo displays info message to user

type ExportRequest 

type ExportRequest struct {
	Address common.Address `json:"address"`
	Meta    Metadata       `json:"meta"`
}

ExportRequest info about query to export accounts

type ExportResponse 

type ExportResponse struct {
	Approved bool `json:"approved"`
}

ExportResponse response to export-request

type ExternalAPI 

type ExternalAPI interface {
	// List available accounts
	List(ctx context.Context) (Accounts, error)
	// New request to create a new account
	New(ctx context.Context) (accounts.Account, error)
	// SignTransaction request to sign the specified transaction
	SignTransaction(ctx context.Context, args SendTxArgs, methodSelector *string) (*trueapi.SignTransactionResult, error)
	// Sign - request to sign the given data (plus prefix)
	Sign(ctx context.Context, addr common.MixedcaseAddress, data hexutil.Bytes) (hexutil.Bytes, error)
	// EcRecover - request to perform ecrecover
	EcRecover(ctx context.Context, data, sig hexutil.Bytes) (common.Address, error)
	// Export - request to export an account
	Export(ctx context.Context, addr common.Address) (json.RawMessage, error)
	// Import - request to import an account
	Import(ctx context.Context, keyJSON json.RawMessage) (Account, error)
}

ExternalAPI defines the external API through which signing requests are made.

type ImportRequest 

type ImportRequest struct {
	Meta Metadata `json:"meta"`
}

ImportRequest info about request to import an Account

type ImportResponse 

type ImportResponse struct {
	Approved    bool   `json:"approved"`
	OldPassword string `json:"old_password"`
	NewPassword string `json:"new_password"`
}

types for the requests/response types between signer and UI

type ListRequest 

type ListRequest struct {
	Accounts []Account `json:"accounts"`
	Meta     Metadata  `json:"meta"`
}

types for the requests/response types between signer and UI

type ListResponse 

type ListResponse struct {
	Accounts []Account `json:"accounts"`
}

types for the requests/response types between signer and UI

type Message 

type Message struct {
	Text string `json:"text"`
}

types for the requests/response types between signer and UI

type Metadata 

type Metadata struct {
	Remote string `json:"remote"`
	Local  string `json:"local"`
	Scheme string `json:"scheme"`
}

Metadata about a request

func MetadataFromContext 

func MetadataFromContext(ctx context.Context) Metadata

MetadataFromContext extracts Metadata from a given context.Context

func (Metadata) String 

func (m Metadata) String() string

String implements Stringer interface

type NewAccountRequest 

type NewAccountRequest struct {
	Meta Metadata `json:"meta"`
}

types for the requests/response types between signer and UI

type NewAccountResponse 

type NewAccountResponse struct {
	Approved bool   `json:"approved"`
	Password string `json:"password"`
}

types for the requests/response types between signer and UI

type SendTxArgs 

type SendTxArgs struct {
	From     common.MixedcaseAddress  `json:"from"`
	To       *common.MixedcaseAddress `json:"to"`
	Gas      hexutil.Uint64           `json:"gas"`
	GasPrice hexutil.Big              `json:"gasPrice"`
	Value    hexutil.Big              `json:"value"`
	Nonce    hexutil.Uint64           `json:"nonce"`
	// We accept "data" and "input" for backwards-compatibility reasons.
	Data  *hexutil.Bytes `json:"data"`
	Input *hexutil.Bytes `json:"input"`
}

SendTxArgs represents the arguments to submit a transaction

func (SendTxArgs) String 

func (args SendTxArgs) String() string

type SignDataRequest 

type SignDataRequest struct {
	Address common.MixedcaseAddress `json:"address"`
	Rawdata hexutil.Bytes           `json:"raw_data"`
	Message string                  `json:"message"`
	Hash    hexutil.Bytes           `json:"hash"`
	Meta    Metadata                `json:"meta"`
}

types for the requests/response types between signer and UI

type SignDataResponse 

type SignDataResponse struct {
	Approved bool `json:"approved"`
	Password string
}

types for the requests/response types between signer and UI

type SignTxRequest 

type SignTxRequest struct {
	Transaction SendTxArgs       `json:"transaction"`
	Callinfo    []ValidationInfo `json:"call_info"`
	Meta        Metadata         `json:"meta"`
}

SignTxRequest contains info about a Transaction to sign

type SignTxResponse 

type SignTxResponse struct {
	//The UI may make changes to the TX
	Transaction SendTxArgs `json:"transaction"`
	Approved    bool       `json:"approved"`
	Password    string     `json:"password"`
}

SignTxResponse result from SignTxRequest

type SignerAPI 

type SignerAPI struct {
	UI SignerUI
	// contains filtered or unexported fields
}

SignerAPI defines the actual implementation of ExternalAPI

func NewSignerAPI 

func NewSignerAPI(chainID int64, ksLocation string, noUSB bool, ui SignerUI, abidb *AbiDb, lightKDF bool) *SignerAPI

NewSignerAPI creates a new API that can be used for Account management. ksLocation specifies the directory where to store the password protected private key that is generated when a new Account is created. noUSB disables USB support that is required to support hardware devices such as ledger and trezor.

func (*SignerAPI) EcRecover 

func (api *SignerAPI) EcRecover(ctx context.Context, data, sig hexutil.Bytes) (common.Address, error)

EcRecover returns the address for the Account that was used to create the signature. Note, this function is compatible with etrue_sign and personal_sign. As such it recovers the address of: hash = keccak256("\x19Ethereum Signed Message:\n"${message length}${message}) addr = ecrecover(hash, signature)

Note, the signature must conform to the secp256k1 curve R, S and V values, where the V value must be be 27 or 28 for legacy reasons.

https://github.com/truechain/truechain-engineering-code/wiki/Management-APIs#personal_ecRecover

func (*SignerAPI) Export 

func (api *SignerAPI) Export(ctx context.Context, addr common.Address) (json.RawMessage, error)

Export returns encrypted private key associated with the given address in web3 keystore format.

func (*SignerAPI) Import 

func (api *SignerAPI) Import(ctx context.Context, keyJSON json.RawMessage) (Account, error)

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 (*SignerAPI) List 

func (api *SignerAPI) List(ctx context.Context) (Accounts, error)

List returns the set of wallet this signer manages. Each wallet can contain multiple accounts.

func (*SignerAPI) New 

func (api *SignerAPI) New(ctx context.Context) (accounts.Account, error)

New creates a new password protected Account. The private key is protected with the given password. Users are responsible to backup the private key that is stored in the keystore location thas was specified when this API was created.

func (*SignerAPI) Sign 

func (api *SignerAPI) Sign(ctx context.Context, addr common.MixedcaseAddress, data hexutil.Bytes) (hexutil.Bytes, error)

Sign calculates an Ethereum ECDSA signature for: keccack256("\x19Ethereum Signed Message:\n" + len(message) + message))

Note, the produced signature conforms to the secp256k1 curve R, S and V values, where the V value will be 27 or 28 for legacy reasons.

The key used to calculate the signature is decrypted with the given password.

https://github.com/truechain/truechain-engineering-code/wiki/Management-APIs#personal_sign

func (*SignerAPI) SignTransaction 

func (api *SignerAPI) SignTransaction(ctx context.Context, args SendTxArgs, methodSelector *string) (*trueapi.SignTransactionResult, error)

SignTransaction signs the given Transaction and returns it both as json and rlp-encoded form

type SignerUI 

type SignerUI interface {
	// ApproveTx prompt the user for confirmation to request to sign Transaction
	ApproveTx(request *SignTxRequest) (SignTxResponse, error)
	// ApproveSignData prompt the user for confirmation to request to sign data
	ApproveSignData(request *SignDataRequest) (SignDataResponse, error)
	// ApproveExport prompt the user for confirmation to export encrypted Account json
	ApproveExport(request *ExportRequest) (ExportResponse, error)
	// ApproveImport prompt the user for confirmation to import Account json
	ApproveImport(request *ImportRequest) (ImportResponse, error)
	// ApproveListing prompt the user for confirmation to list accounts
	// the list of accounts to list can be modified by the UI
	ApproveListing(request *ListRequest) (ListResponse, error)
	// ApproveNewAccount prompt the user for confirmation to create new Account, and reveal to caller
	ApproveNewAccount(request *NewAccountRequest) (NewAccountResponse, error)
	// ShowError displays error message to user
	ShowError(message string)
	// ShowInfo displays info message to user
	ShowInfo(message string)
	// OnApprovedTx notifies the UI about a transaction having been successfully signed.
	// This method can be used by a UI to keep track of e.g. how much has been sent to a particular recipient.
	OnApprovedTx(tx trueapi.SignTransactionResult)
	// OnSignerStartup is invoked when the signer boots, and tells the UI info about external API location and version
	// information
	OnSignerStartup(info StartupInfo)
}

SignerUI specifies what method a UI needs to implement to be able to be used as a UI for the signer

type StartupInfo 

type StartupInfo struct {
	Info map[string]interface{} `json:"info"`
}

types for the requests/response types between signer and UI

type StdIOUI 

type StdIOUI struct {
	// contains filtered or unexported fields
}

func NewStdIOUI 

func NewStdIOUI() *StdIOUI

func (*StdIOUI) ApproveExport 

func (ui *StdIOUI) ApproveExport(request *ExportRequest) (ExportResponse, error)

func (*StdIOUI) ApproveImport 

func (ui *StdIOUI) ApproveImport(request *ImportRequest) (ImportResponse, error)

func (*StdIOUI) ApproveListing 

func (ui *StdIOUI) ApproveListing(request *ListRequest) (ListResponse, error)

func (*StdIOUI) ApproveNewAccount 

func (ui *StdIOUI) ApproveNewAccount(request *NewAccountRequest) (NewAccountResponse, error)

func (*StdIOUI) ApproveSignData 

func (ui *StdIOUI) ApproveSignData(request *SignDataRequest) (SignDataResponse, error)

func (*StdIOUI) ApproveTx 

func (ui *StdIOUI) ApproveTx(request *SignTxRequest) (SignTxResponse, error)

func (*StdIOUI) OnApprovedTx 

func (ui *StdIOUI) OnApprovedTx(tx trueapi.SignTransactionResult)

func (*StdIOUI) OnSignerStartup 

func (ui *StdIOUI) OnSignerStartup(info StartupInfo)

func (*StdIOUI) ShowError 

func (ui *StdIOUI) ShowError(message string)

func (*StdIOUI) ShowInfo 

func (ui *StdIOUI) ShowInfo(message string)

type ValidationInfo 

type ValidationInfo struct {
	Typ     string `json:"type"`
	Message string `json:"message"`
}

type ValidationMessages 

type ValidationMessages struct {
	Messages []ValidationInfo
}

type Validator 

type Validator struct {
	// contains filtered or unexported fields
}

func NewValidator 

func NewValidator(db *AbiDb) *Validator

func (*Validator) ValidateTransaction 

func (v *Validator) ValidateTransaction(txArgs *SendTxArgs, methodSelector *string) (*ValidationMessages, error)

ValidateTransaction does a number of checks on the supplied transaction, and returns either a list of warnings, or an error, indicating that the transaction should be immediately rejected

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