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280 lines
8.8 KiB
280 lines
8.8 KiB
// Copyright 2015 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package abi
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import (
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"encoding/json"
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"fmt"
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"reflect"
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"strings"
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)
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// Argument holds the name of the argument and the corresponding type.
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// Types are used when packing and testing arguments.
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type Argument struct {
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Name string
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Type Type
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Indexed bool // indexed is only used by events
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}
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// Arguments is a list of Argument
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type Arguments []Argument
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// ArgumentMarshaling is a struct for argument
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type ArgumentMarshaling struct {
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Name string
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Type string
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InternalType string
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Components []ArgumentMarshaling
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Indexed bool
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}
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// UnmarshalJSON implements json.Unmarshaler interface.
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func (argument *Argument) UnmarshalJSON(data []byte) error {
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var arg ArgumentMarshaling
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err := json.Unmarshal(data, &arg)
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if err != nil {
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return fmt.Errorf("argument json err: %v", err)
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}
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argument.Type, err = NewType(arg.Type, arg.InternalType, arg.Components)
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if err != nil {
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return err
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}
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argument.Name = arg.Name
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argument.Indexed = arg.Indexed
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return nil
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}
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// NonIndexed returns the arguments with indexed arguments filtered out.
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func (arguments Arguments) NonIndexed() Arguments {
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var ret []Argument
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for _, arg := range arguments {
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if !arg.Indexed {
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ret = append(ret, arg)
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}
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}
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return ret
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}
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// isTuple returns true for non-atomic constructs, like (uint,uint) or uint[].
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func (arguments Arguments) isTuple() bool {
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return len(arguments) > 1
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}
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// Unpack performs the operation hexdata -> Go format.
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func (arguments Arguments) Unpack(data []byte) ([]interface{}, error) {
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if len(data) == 0 {
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if len(arguments) != 0 {
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return nil, fmt.Errorf("abi: attempting to unmarshall an empty string while arguments are expected")
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}
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// Nothing to unmarshal, return default variables
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nonIndexedArgs := arguments.NonIndexed()
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defaultVars := make([]interface{}, len(nonIndexedArgs))
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for index, arg := range nonIndexedArgs {
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defaultVars[index] = reflect.New(arg.Type.GetType())
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}
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return defaultVars, nil
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}
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return arguments.UnpackValues(data)
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}
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// UnpackIntoMap performs the operation hexdata -> mapping of argument name to argument value.
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func (arguments Arguments) UnpackIntoMap(v map[string]interface{}, data []byte) error {
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// Make sure map is not nil
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if v == nil {
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return fmt.Errorf("abi: cannot unpack into a nil map")
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}
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if len(data) == 0 {
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if len(arguments) != 0 {
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return fmt.Errorf("abi: attempting to unmarshall an empty string while arguments are expected")
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}
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return nil // Nothing to unmarshal, return
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}
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marshalledValues, err := arguments.UnpackValues(data)
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if err != nil {
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return err
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}
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for i, arg := range arguments.NonIndexed() {
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v[arg.Name] = marshalledValues[i]
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}
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return nil
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}
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// Copy performs the operation go format -> provided struct.
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func (arguments Arguments) Copy(v interface{}, values []interface{}) error {
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// make sure the passed value is arguments pointer
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if reflect.Ptr != reflect.ValueOf(v).Kind() {
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return fmt.Errorf("abi: Unpack(non-pointer %T)", v)
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}
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if len(values) == 0 {
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if len(arguments) != 0 {
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return fmt.Errorf("abi: attempting to copy no values while %d arguments are expected", len(arguments))
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}
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return nil // Nothing to copy, return
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}
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if arguments.isTuple() {
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return arguments.copyTuple(v, values)
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}
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return arguments.copyAtomic(v, values[0])
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}
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// unpackAtomic unpacks ( hexdata -> go ) a single value
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func (arguments Arguments) copyAtomic(v interface{}, marshalledValues interface{}) error {
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dst := reflect.ValueOf(v).Elem()
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src := reflect.ValueOf(marshalledValues)
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if dst.Kind() == reflect.Struct && src.Kind() != reflect.Struct {
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return set(dst.Field(0), src)
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}
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return set(dst, src)
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}
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// copyTuple copies a batch of values from marshalledValues to v.
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func (arguments Arguments) copyTuple(v interface{}, marshalledValues []interface{}) error {
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value := reflect.ValueOf(v).Elem()
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nonIndexedArgs := arguments.NonIndexed()
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switch value.Kind() {
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case reflect.Struct:
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argNames := make([]string, len(nonIndexedArgs))
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for i, arg := range nonIndexedArgs {
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argNames[i] = arg.Name
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}
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var err error
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abi2struct, err := mapArgNamesToStructFields(argNames, value)
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if err != nil {
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return err
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}
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for i, arg := range nonIndexedArgs {
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field := value.FieldByName(abi2struct[arg.Name])
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if !field.IsValid() {
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return fmt.Errorf("abi: field %s can't be found in the given value", arg.Name)
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}
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if err := set(field, reflect.ValueOf(marshalledValues[i])); err != nil {
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return err
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}
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}
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case reflect.Slice, reflect.Array:
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if value.Len() < len(marshalledValues) {
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return fmt.Errorf("abi: insufficient number of arguments for unpack, want %d, got %d", len(arguments), value.Len())
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}
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for i := range nonIndexedArgs {
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if err := set(value.Index(i), reflect.ValueOf(marshalledValues[i])); err != nil {
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return err
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}
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}
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default:
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return fmt.Errorf("abi:[2] cannot unmarshal tuple in to %v", value.Type())
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}
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return nil
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}
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// UnpackValues can be used to unpack ABI-encoded hexdata according to the ABI-specification,
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// without supplying a struct to unpack into. Instead, this method returns a list containing the
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// values. An atomic argument will be a list with one element.
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func (arguments Arguments) UnpackValues(data []byte) ([]interface{}, error) {
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nonIndexedArgs := arguments.NonIndexed()
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retval := make([]interface{}, 0, len(nonIndexedArgs))
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virtualArgs := 0
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for index, arg := range nonIndexedArgs {
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marshalledValue, err := toGoType((index+virtualArgs)*32, arg.Type, data)
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if arg.Type.T == ArrayTy && !isDynamicType(arg.Type) {
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// If we have a static array, like [3]uint256, these are coded as
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// just like uint256,uint256,uint256.
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// This means that we need to add two 'virtual' arguments when
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// we count the index from now on.
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//
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// Array values nested multiple levels deep are also encoded inline:
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// [2][3]uint256: uint256,uint256,uint256,uint256,uint256,uint256
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//
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// Calculate the full array size to get the correct offset for the next argument.
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// Decrement it by 1, as the normal index increment is still applied.
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virtualArgs += getTypeSize(arg.Type)/32 - 1
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} else if arg.Type.T == TupleTy && !isDynamicType(arg.Type) {
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// If we have a static tuple, like (uint256, bool, uint256), these are
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// coded as just like uint256,bool,uint256
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virtualArgs += getTypeSize(arg.Type)/32 - 1
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}
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if err != nil {
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return nil, err
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}
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retval = append(retval, marshalledValue)
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}
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return retval, nil
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}
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// PackValues performs the operation Go format -> Hexdata.
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// It is the semantic opposite of UnpackValues.
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func (arguments Arguments) PackValues(args []interface{}) ([]byte, error) {
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return arguments.Pack(args...)
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}
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// Pack performs the operation Go format -> Hexdata.
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func (arguments Arguments) Pack(args ...interface{}) ([]byte, error) {
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// Make sure arguments match up and pack them
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abiArgs := arguments
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if len(args) != len(abiArgs) {
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return nil, fmt.Errorf("argument count mismatch: got %d for %d", len(args), len(abiArgs))
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}
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// variable input is the output appended at the end of packed
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// output. This is used for strings and bytes types input.
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var variableInput []byte
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// input offset is the bytes offset for packed output
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inputOffset := 0
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for _, abiArg := range abiArgs {
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inputOffset += getTypeSize(abiArg.Type)
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}
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var ret []byte
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for i, a := range args {
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input := abiArgs[i]
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// pack the input
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packed, err := input.Type.pack(reflect.ValueOf(a))
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if err != nil {
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return nil, err
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}
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// check for dynamic types
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if isDynamicType(input.Type) {
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// set the offset
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ret = append(ret, packNum(reflect.ValueOf(inputOffset))...)
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// calculate next offset
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inputOffset += len(packed)
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// append to variable input
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variableInput = append(variableInput, packed...)
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} else {
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// append the packed value to the input
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ret = append(ret, packed...)
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}
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}
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// append the variable input at the end of the packed input
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ret = append(ret, variableInput...)
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return ret, nil
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}
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// ToCamelCase converts an under-score string to a camel-case string
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func ToCamelCase(input string) string {
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parts := strings.Split(input, "_")
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for i, s := range parts {
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if len(s) > 0 {
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parts[i] = strings.ToUpper(s[:1]) + s[1:]
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}
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}
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return strings.Join(parts, "")
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}
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