diff options
Diffstat (limited to 'packages/utils/src/abi_encoder')
6 files changed, 390 insertions, 0 deletions
diff --git a/packages/utils/src/abi_encoder/abstract_data_types/data_type.ts b/packages/utils/src/abi_encoder/abstract_data_types/data_type.ts new file mode 100644 index 000000000..a6adeb23b --- /dev/null +++ b/packages/utils/src/abi_encoder/abstract_data_types/data_type.ts @@ -0,0 +1,51 @@ +import { DataItem } from 'ethereum-types'; +import * as _ from 'lodash'; + +import { Calldata, CalldataBlock, RawCalldata } from '../calldata'; +import { DecodingRules, EncodingRules } from '../utils/rules'; + +import { DataTypeFactory } from './interfaces'; + +export abstract class DataType { + private static readonly _DEFAULT_ENCODING_RULES: EncodingRules = { optimize: false, annotate: false }; + private static readonly _DEFAULT_DECODING_RULES: DecodingRules = { structsAsObjects: false }; + private readonly _dataItem: DataItem; + private readonly _factory: DataTypeFactory; + + constructor(dataItem: DataItem, factory: DataTypeFactory) { + this._dataItem = dataItem; + this._factory = factory; + } + + public getDataItem(): DataItem { + return this._dataItem; + } + + public getFactory(): DataTypeFactory { + return this._factory; + } + + public encode(value: any, rules?: EncodingRules, selector?: string): string { + const rules_ = rules ? rules : DataType._DEFAULT_ENCODING_RULES; + const calldata = new Calldata(rules_); + if (selector) { + calldata.setSelector(selector); + } + const block = this.generateCalldataBlock(value); + calldata.setRoot(block); // @TODO CHANGE + const calldataHex = calldata.toHexString(); + return calldataHex; + } + + public decode(calldata: string, rules?: DecodingRules, hasSelector: boolean = false): any { + const rawCalldata = new RawCalldata(calldata, hasSelector); + const rules_ = rules ? rules : DataType._DEFAULT_DECODING_RULES; + const value = this.generateValue(rawCalldata, rules_); + return value; + } + + public abstract generateCalldataBlock(value: any, parentBlock?: CalldataBlock): CalldataBlock; + public abstract generateValue(calldata: RawCalldata, rules: DecodingRules): any; + public abstract getSignature(): string; + public abstract isStatic(): boolean; +} diff --git a/packages/utils/src/abi_encoder/abstract_data_types/dependent_data_type.ts b/packages/utils/src/abi_encoder/abstract_data_types/dependent_data_type.ts new file mode 100644 index 000000000..e9f390b22 --- /dev/null +++ b/packages/utils/src/abi_encoder/abstract_data_types/dependent_data_type.ts @@ -0,0 +1,50 @@ +import { DataItem } from 'ethereum-types'; +import * as ethUtil from 'ethereumjs-util'; +import * as _ from 'lodash'; + +import { CalldataBlock, DependentCalldataBlock, RawCalldata } from '../calldata'; +import * as Constants from '../constants'; +import { DecodingRules } from '../utils/rules'; + +import { DataType } from './data_type'; +import { DataTypeFactory } from './interfaces'; + +export abstract class DependentDataType extends DataType { + protected _dependency: DataType; + protected _parent: DataType; + private readonly _isStatic: boolean; + + public constructor(dataItem: DataItem, factory: DataTypeFactory, dependency: DataType, parent: DataType) { + super(dataItem, factory); + this._dependency = dependency; + this._parent = parent; + this._isStatic = true; + } + + public generateCalldataBlock(value: any, parentBlock?: CalldataBlock): DependentCalldataBlock { + if (parentBlock === undefined) { + throw new Error(`DependentDataType requires a parent block to generate its block`); + } + const dependencyBlock = this._dependency.generateCalldataBlock(value, parentBlock); + const name = this.getDataItem().name; + const signature = this.getSignature(); + const parentName = parentBlock === undefined ? '' : parentBlock.getName(); + const block = new DependentCalldataBlock(name, signature, parentName, dependencyBlock, parentBlock); + return block; + } + + public generateValue(calldata: RawCalldata, rules: DecodingRules): any { + const destinationOffsetBuf = calldata.popWord(); + const currentOffset = calldata.getOffset(); + const destinationOffsetRelative = parseInt(ethUtil.bufferToHex(destinationOffsetBuf), Constants.HEX_BASE); + const destinationOffsetAbsolute = calldata.toAbsoluteOffset(destinationOffsetRelative); + calldata.setOffset(destinationOffsetAbsolute); + const value = this._dependency.generateValue(calldata, rules); + calldata.setOffset(currentOffset); + return value; + } + + public isStatic(): boolean { + return this._isStatic; + } +} diff --git a/packages/utils/src/abi_encoder/abstract_data_types/index.ts b/packages/utils/src/abi_encoder/abstract_data_types/index.ts new file mode 100644 index 000000000..9ad568134 --- /dev/null +++ b/packages/utils/src/abi_encoder/abstract_data_types/index.ts @@ -0,0 +1,5 @@ +export * from './interfaces'; +export * from './data_type'; +export * from './dependent_data_type'; +export * from './member_data_type'; +export * from './payload_data_type'; diff --git a/packages/utils/src/abi_encoder/abstract_data_types/interfaces.ts b/packages/utils/src/abi_encoder/abstract_data_types/interfaces.ts new file mode 100644 index 000000000..2ae92659c --- /dev/null +++ b/packages/utils/src/abi_encoder/abstract_data_types/interfaces.ts @@ -0,0 +1,16 @@ +import { DataItem } from 'ethereum-types'; + +import { RawCalldata } from '../calldata'; + +import { DataType } from './data_type'; + +export interface DataTypeFactory { + create: (dataItem: DataItem, parentDataType?: DataType) => DataType; + mapDataItemToDataType: (dataItem: DataItem) => DataType; +} + +export interface DataTypeStaticInterface { + matchType: (type: string) => boolean; + encodeValue: (value: any) => Buffer; + decodeValue: (rawCalldata: RawCalldata) => any; +} diff --git a/packages/utils/src/abi_encoder/abstract_data_types/member_data_type.ts b/packages/utils/src/abi_encoder/abstract_data_types/member_data_type.ts new file mode 100644 index 000000000..f44a6dd30 --- /dev/null +++ b/packages/utils/src/abi_encoder/abstract_data_types/member_data_type.ts @@ -0,0 +1,230 @@ +import { DataItem } from 'ethereum-types'; +import * as ethUtil from 'ethereumjs-util'; +import * as _ from 'lodash'; + +import { BigNumber } from '../../configured_bignumber'; +import { CalldataBlock, MemberCalldataBlock, RawCalldata } from '../calldata'; +import * as Constants from '../constants'; +import { DecodingRules } from '../utils/rules'; + +import { DataType } from './data_type'; +import { DependentDataType } from './dependent_data_type'; +import { DataTypeFactory } from './interfaces'; + +interface MemberMap { + [key: string]: number; +} + +export abstract class MemberDataType extends DataType { + protected readonly _arrayLength: number | undefined; + protected readonly _arrayElementType: string | undefined; + private readonly _memberMap: MemberMap; + private readonly _members: DataType[]; + private readonly _isArray: boolean; + + public constructor( + dataItem: DataItem, + factory: DataTypeFactory, + isArray: boolean = false, + arrayLength?: number, + arrayElementType?: string, + ) { + super(dataItem, factory); + this._memberMap = {}; + this._members = []; + this._isArray = isArray; + this._arrayLength = arrayLength; + this._arrayElementType = arrayElementType; + if (isArray && arrayLength !== undefined) { + [this._members, this._memberMap] = this._createMembersWithLength(dataItem, arrayLength); + } else if (!isArray) { + [this._members, this._memberMap] = this._createMembersWithKeys(dataItem); + } + } + + public generateCalldataBlock(value: any[] | object, parentBlock?: CalldataBlock): MemberCalldataBlock { + const block = + value instanceof Array + ? this._generateCalldataBlockFromArray(value, parentBlock) + : this._generateCalldataBlockFromObject(value, parentBlock); + return block; + } + + public generateValue(calldata: RawCalldata, rules: DecodingRules): any[] | object { + let members = this._members; + if (this._isArray && this._arrayLength === undefined) { + const arrayLengthBuf = calldata.popWord(); + const arrayLengthHex = ethUtil.bufferToHex(arrayLengthBuf); + const hexBase = 16; + const arrayLength = new BigNumber(arrayLengthHex, hexBase); + + [members] = this._createMembersWithLength(this.getDataItem(), arrayLength.toNumber()); + } + + calldata.startScope(); + let value: any[] | object; + if (rules.structsAsObjects && !this._isArray) { + value = {}; + _.each(this._memberMap, (idx: number, key: string) => { + const member = this._members[idx]; + const memberValue = member.generateValue(calldata, rules); + (value as { [key: string]: any })[key] = memberValue; + }); + } else { + value = []; + _.each(members, (member: DataType, idx: number) => { + const memberValue = member.generateValue(calldata, rules); + (value as any[]).push(memberValue); + }); + } + calldata.endScope(); + return value; + } + + public isStatic(): boolean { + /* For Tuple: + const isStaticTuple = this.children.length === 0; + return isStaticTuple; // @TODO: True in every case or only when dynamic data? + + For Array: + if isLengthDefined = false then this is false + + Otherwise if the first element is a Pointer then false + */ + + if (this._isArray && this._arrayLength === undefined) { + return false; + } + + // Search for dependent members + const dependentMember = _.find(this._members, (member: DataType) => { + return member instanceof DependentDataType; + }); + const isStatic = dependentMember === undefined; // static if we couldn't find a dependent member + return isStatic; + } + + protected _generateCalldataBlockFromArray(value: any[], parentBlock?: CalldataBlock): MemberCalldataBlock { + // Sanity check length + if (this._arrayLength !== undefined && value.length !== this._arrayLength) { + throw new Error( + `Expected array of ${JSON.stringify( + this._arrayLength, + )} elements, but got array of length ${JSON.stringify(value.length)}`, + ); + } + + const parentName = parentBlock === undefined ? '' : parentBlock.getName(); + const methodBlock: MemberCalldataBlock = new MemberCalldataBlock( + this.getDataItem().name, + this.getSignature(), + parentName, + ); + + let members = this._members; + if (this._isArray && this._arrayLength === undefined) { + [members] = this._createMembersWithLength(this.getDataItem(), value.length); + + const lenBuf = ethUtil.setLengthLeft( + ethUtil.toBuffer(`0x${value.length.toString(Constants.HEX_BASE)}`), + Constants.EVM_WORD_WIDTH_IN_BYTES, + ); + methodBlock.setHeader(lenBuf); + } + + const memberBlocks: CalldataBlock[] = []; + _.each(members, (member: DataType, idx: number) => { + const block = member.generateCalldataBlock(value[idx], methodBlock); + memberBlocks.push(block); + }); + methodBlock.setMembers(memberBlocks); + return methodBlock; + } + + protected _generateCalldataBlockFromObject(obj: object, parentBlock?: CalldataBlock): MemberCalldataBlock { + const parentName = parentBlock === undefined ? '' : parentBlock.getName(); + const methodBlock: MemberCalldataBlock = new MemberCalldataBlock( + this.getDataItem().name, + this.getSignature(), + parentName, + ); + const memberBlocks: CalldataBlock[] = []; + const childMap = _.cloneDeep(this._memberMap); + _.forOwn(obj, (value: any, key: string) => { + if (!(key in childMap)) { + throw new Error( + `Could not assign tuple to object: unrecognized key '${key}' in object ${this.getDataItem().name}`, + ); + } + const block = this._members[this._memberMap[key]].generateCalldataBlock(value, methodBlock); + memberBlocks.push(block); + delete childMap[key]; + }); + + if (Object.keys(childMap).length !== 0) { + throw new Error(`Could not assign tuple to object: missing keys ${Object.keys(childMap)}`); + } + + methodBlock.setMembers(memberBlocks); + return methodBlock; + } + + protected _computeSignatureOfMembers(): string { + // Compute signature of members + let signature = `(`; + _.each(this._members, (member: DataType, i: number) => { + signature += member.getSignature(); + if (i < this._members.length - 1) { + signature += ','; + } + }); + signature += ')'; + return signature; + } + + private _createMembersWithKeys(dataItem: DataItem): [DataType[], MemberMap] { + // Sanity check + if (dataItem.components === undefined) { + throw new Error(`Expected components`); + } + + const members: DataType[] = []; + const memberMap: MemberMap = {}; + _.each(dataItem.components, (memberItem: DataItem) => { + const childDataItem: DataItem = { + type: memberItem.type, + name: `${dataItem.name}.${memberItem.name}`, + }; + const components = memberItem.components; + if (components !== undefined) { + childDataItem.components = components; + } + const child = this.getFactory().create(childDataItem, this); + memberMap[memberItem.name] = members.length; + members.push(child); + }); + + return [members, memberMap]; + } + + private _createMembersWithLength(dataItem: DataItem, length: number): [DataType[], MemberMap] { + const members: DataType[] = []; + const memberMap: MemberMap = {}; + const range = _.range(length); + _.each(range, (idx: number) => { + const childDataItem: DataItem = { + type: this._arrayElementType ? this._arrayElementType : '', + name: `${dataItem.name}[${idx.toString(Constants.DEC_BASE)}]`, + }; + const components = dataItem.components; + if (components !== undefined) { + childDataItem.components = components; + } + const child = this.getFactory().create(childDataItem, this); + memberMap[idx.toString(Constants.DEC_BASE)] = members.length; + members.push(child); + }); + + return [members, memberMap]; + } +} diff --git a/packages/utils/src/abi_encoder/abstract_data_types/payload_data_type.ts b/packages/utils/src/abi_encoder/abstract_data_types/payload_data_type.ts new file mode 100644 index 000000000..767e64f51 --- /dev/null +++ b/packages/utils/src/abi_encoder/abstract_data_types/payload_data_type.ts @@ -0,0 +1,38 @@ +import { DataItem } from 'ethereum-types'; +import * as _ from 'lodash'; + +import { CalldataBlock, PayloadCalldataBlock, RawCalldata } from '../calldata'; +import { DecodingRules } from '../utils/rules'; + +import { DataType } from './data_type'; +import { DataTypeFactory } from './interfaces'; + +export abstract class PayloadDataType extends DataType { + protected _hasConstantSize: boolean; + + public constructor(dataItem: DataItem, factory: DataTypeFactory, hasConstantSize: boolean) { + super(dataItem, factory); + this._hasConstantSize = hasConstantSize; + } + + public generateCalldataBlock(value: any, parentBlock?: CalldataBlock): PayloadCalldataBlock { + const encodedValue = this.encodeValue(value); + const name = this.getDataItem().name; + const signature = this.getSignature(); + const parentName = parentBlock === undefined ? '' : parentBlock.getName(); + const block = new PayloadCalldataBlock(name, signature, parentName, encodedValue); + return block; + } + + public generateValue(calldata: RawCalldata, rules: DecodingRules): any { + const value = this.decodeValue(calldata); + return value; + } + + public isStatic(): boolean { + return this._hasConstantSize; + } + + public abstract encodeValue(value: any): Buffer; + public abstract decodeValue(calldata: RawCalldata): any; +} |