@sphereon/ssi-sdk-web3.headless-provider/dist/index.cjs.map

{"version":3,"sources":["../src/index.ts","../src/types.ts","../src/ethers-headless-provider.ts","../src/errors.ts","../src/event-emitter.ts","../src/ethers-kms-signer.ts","../src/functions.ts","../src/factory.ts","../src/rpc-server.ts"],"sourcesContent":["export * from './types'\nexport * from './ethers-headless-provider'\nexport * from './ethers-kms-signer'\nexport * from './factory'\nexport * from './event-emitter'\nexport * from './functions'\nexport * from './rpc-server'\n\n/**\n *  8f2695a99c416ab9241fc75ae53f90b083aecff9e4463e046a1527f456b502c6\n */\n","import { TransactionRequest } from '@ethersproject/abstract-provider'\nimport { TypedDataDomain, TypedDataField } from '@ethersproject/abstract-signer'\nimport { IAgentContext, IKeyManager } from '@veramo/core'\n\nexport type rpcMethods = 'eth_call' | 'eth_getBalance'\n\nexport interface IWeb3Provider {\n  isMetaMask?: boolean\n\n  request(args: { method: 'eth_call'; params: any[] }): Promise<any>\n  request(args: { method: 'eth_getBalance'; params: string[] }): Promise<string>\n  request(args: { method: 'eth_accounts'; params: [] }): Promise<string[]>\n  request(args: { method: 'eth_requestAccounts'; params: [] }): Promise<string[]>\n  request(args: { method: 'net_version'; params: [] }): Promise<number>\n  request(args: { method: 'eth_chainId'; params: [] }): Promise<string>\n  request(args: { method: 'personal_sign'; params: string[] }): Promise<string>\n  request(args: { method: 'eth_signTypedData' | 'eth_signTypedData_v1'; params: [object[], string] }): Promise<string>\n  request(args: { method: 'eth_signTypedData_v3' | 'eth_signTypedData_v4'; params: string[] }): Promise<string>\n  request(args: { method: 'eth_sendTransaction'; params: TransactionRequest[] }): Promise<string>\n  request(args: { method: rpcMethods | string; params?: any[] }): Promise<any>\n\n  emit(eventName: string, ...args: any[]): void\n  on(eventName: string, listener: (eventName: string) => void): void\n}\n\nexport type IRequiredContext = IAgentContext<IKeyManager>\n\nexport interface PendingRequest {\n  requestInfo: { method: string; params: any[] }\n  reject: (err: { message?: string; code?: number }) => void\n  authorize: () => Promise<void>\n}\n\nexport interface ChainConnection {\n  chainId: number\n  rpcUrl: string\n}\n\nexport interface Web3ProviderConfig {\n  debug?: boolean\n  logger: typeof console.log\n}\nexport interface TypedDataSigner {\n  _signTypedData(domain: TypedDataDomain, types: Record<string, Array<TypedDataField>>, value: Record<string, any>): Promise<string>\n}\n\nexport enum Web3Method {\n  RequestAccounts = 'eth_requestAccounts',\n  Accounts = 'eth_accounts',\n  SendTransaction = 'eth_sendTransaction',\n  SwitchEthereumChain = 'wallet_switchEthereumChain',\n  AddEthereumChain = 'wallet_addEthereumChain',\n  SignMessage = 'personal_sign',\n  SignTypedData = 'eth_signTypedData',\n  SignTypedDataV1 = 'eth_signTypedData_v1',\n  SignTypedDataV3 = 'eth_signTypedData_v3',\n  SignTypedDataV4 = 'eth_signTypedData_v4',\n}\n\nexport function without<T>(list: T[], item: T): T[] {\n  const idx = list.indexOf(item)\n  if (idx >= 0) {\n    return list.slice(0, idx).concat(list.slice(idx + 1))\n  }\n  return list\n}\n","import { TransactionRequest } from '@ethersproject/abstract-provider'\nimport { toUtf8String } from '@ethersproject/strings'\nimport { signTypedData, SignTypedDataVersion } from '@metamask/eth-sig-util'\nimport assert from 'assert/strict'\nimport { ethers, Signer, Wallet } from 'ethers'\n// import {hashMessage} from \"ethers/lib/utils\";\nimport { BehaviorSubject, filter, first, firstValueFrom, from, switchMap, tap } from 'rxjs'\n\nimport { Deny, Disconnected, ErrorWithCode, Unauthorized, UnrecognizedChainID } from './errors'\nimport { EthersKMSSigner } from './ethers-kms-signer'\nimport { EventEmitter } from './event-emitter'\nimport { ChainConnection, IWeb3Provider, PendingRequest, Web3Method, Web3ProviderConfig, without } from './types'\n\nexport class EthersHeadlessProvider extends EventEmitter implements IWeb3Provider {\n  private _pendingRequests = new BehaviorSubject<PendingRequest[]>([])\n  private _signers: Signer[] = []\n  private _activeChainId: number\n  private _rpc: Record<number, ethers.providers.JsonRpcProvider> = {}\n  private _config: { debug: boolean; logger: typeof console.log }\n  private _authorizedRequests: { [K in Web3Method | string]?: boolean } = {}\n\n  constructor(\n    signers: Signer[],\n    private readonly chains: ChainConnection[],\n    // @ts-ignore\n    config: Web3ProviderConfig = {},\n  ) {\n    super()\n    this._signers = signers\n    this._activeChainId = chains[0].chainId\n    this._config = Object.assign({ debug: true, logger: console.log }, config)\n  }\n\n  request(args: { method: 'eth_call'; params: any[] }): Promise<any>\n  request(args: { method: 'eth_getBalance'; params: string[] }): Promise<string>\n  request(args: { method: 'eth_accounts'; params: [] }): Promise<string[]>\n  request(args: { method: 'eth_requestAccounts'; params: string[] }): Promise<string[]>\n\n  request(args: { method: 'net_version'; params: [] }): Promise<number>\n  request(args: { method: 'eth_chainId'; params: [] }): Promise<string>\n  request(args: { method: 'personal_sign'; params: string[] }): Promise<string>\n  request(args: { method: 'eth_signTypedData' | 'eth_signTypedData_v1'; params: [object[], string] }): Promise<string>\n\n  request(args: { method: 'eth_signTypedData_v3' | 'eth_signTypedData_v4'; params: string[] }): Promise<string>\n\n  request(args: { method: 'eth_sendTransaction'; params: TransactionRequest[] }): Promise<string>\n\n  async request({ method, params }: { method: string; params: any[] }): Promise<any> {\n    if (this._config.debug) {\n      this._config.logger(JSON.stringify({ method, params }))\n    }\n\n    switch (method) {\n      case 'eth_call':\n      case 'eth_getBalance':\n      case 'eth_estimateGas':\n      case 'eth_blockNumber':\n      case 'eth_getBlockByNumber':\n      case 'eth_getTransactionByHash':\n      case 'eth_getTransactionReceipt':\n      case 'eth_feeHistory':\n        return this.getRpc().send(method, params)\n\n      case 'eth_requestAccounts':\n      case 'eth_accounts':\n        return this.waitAuthorization(\n          { method, params },\n          async () => {\n            const { chainId } = this.getCurrentChain()\n            this.emit('connect', { chainId })\n            return Promise.all(this._signers.map((wallet) => wallet.getAddress()))\n          },\n          true,\n          'eth_requestAccounts',\n        )\n\n      case 'eth_chainId': {\n        const { chainId } = this.getCurrentChain()\n        return '0x' + chainId.toString(16)\n      }\n\n      case 'net_version': {\n        const { chainId } = this.getCurrentChain()\n        return '' + chainId\n      }\n\n      case 'eth_sendTransaction': {\n        return this.waitAuthorization({ method, params }, async () => {\n          const wallet = this.getCurrentWallet()\n          const rpc = this.getRpc()\n          const { gas, from, ...txRequest } = params[0]\n          const tx = await wallet.connect(rpc).sendTransaction(txRequest)\n          return tx.hash\n        })\n      }\n\n      case 'eth_sign': {\n        return this.waitAuthorization({ method, params }, async () => {\n          const wallet = this.getCurrentWallet()\n          const rpc = this.getRpc()\n          const message = params[1]\n          return await (wallet.connect(rpc) as EthersKMSSigner).signMessage(message)\n        })\n      }\n\n      case 'wallet_addEthereumChain': {\n        return this.waitAuthorization({ method, params }, async () => {\n          const chainId = Number(params[0].chainId)\n          const { rpcUrl } = params[0]\n          this.addNetwork(chainId, rpcUrl)\n          return null\n        })\n      }\n\n      case 'wallet_switchEthereumChain': {\n        if (this._activeChainId === Number(params[0].chainId)) {\n          return null\n        }\n        return this.waitAuthorization({ method, params }, async () => {\n          const chainId = Number(params[0].chainId)\n          this.switchNetwork(chainId)\n          return null\n        })\n      }\n\n      case 'personal_sign': {\n        return this.waitAuthorization({ method, params }, async () => {\n          const wallet = this.getCurrentWallet()\n          const address = await wallet.getAddress()\n          assert.equal(address, ethers.utils.getAddress(params[1]))\n          const message = toUtf8String(params[0])\n\n          const signature = await wallet.signMessage(message)\n          if (this._config.debug) {\n            this._config.logger('personal_sign', {\n              message,\n              signature,\n            })\n          }\n\n          return signature\n        })\n      }\n\n      case 'eth_signTypedData':\n      case 'eth_signTypedData_v1': {\n        return this.waitAuthorization({ method, params }, async () => {\n          const wallet = this.getCurrentWallet() as Wallet\n          const address = await wallet.getAddress()\n          assert.equal(address, ethers.utils.getAddress(params[1]))\n\n          const msgParams = params[0]\n\n          return signTypedData({\n            privateKey: Buffer.from(wallet.privateKey.slice(2), 'hex'),\n            data: msgParams,\n            version: SignTypedDataVersion.V1,\n          })\n        })\n      }\n\n      case 'eth_signTypedData_v3':\n      case 'eth_signTypedData_v4': {\n        return this.waitAuthorization({ method, params }, async () => {\n          const wallet = this.getCurrentWallet() as Wallet\n          const address = await wallet.getAddress()\n          assert.equal(address, ethers.utils.getAddress(params[0]))\n\n          const msgParams = JSON.parse(params[1])\n\n          return signTypedData({\n            privateKey: Buffer.from(wallet.privateKey.slice(2), 'hex'),\n            data: msgParams,\n            version: method === 'eth_signTypedData_v4' ? SignTypedDataVersion.V4 : SignTypedDataVersion.V3,\n          })\n        })\n      }\n\n      default:\n        return this.getRpc().send(method, params)\n      // throw UnsupportedMethod()\n    }\n  }\n\n  getCurrentWallet(): Signer {\n    const wallet = this._signers[0]\n\n    if (!wallet) {\n      throw Unauthorized()\n    }\n\n    return wallet\n  }\n\n  waitAuthorization<T>(requestInfo: PendingRequest['requestInfo'], task: () => Promise<T>, permanentPermission = false, methodOverride?: string) {\n    const method = methodOverride ?? requestInfo.method\n\n    if (this._authorizedRequests[method]) {\n      return task()\n    }\n\n    return new Promise((resolve, reject) => {\n      const pendingRequest: PendingRequest = {\n        requestInfo,\n        authorize: async () => {\n          if (permanentPermission) {\n            this._authorizedRequests[method] = true\n          }\n\n          resolve(await task())\n        },\n        reject(err) {\n          reject(err)\n        },\n      }\n\n      this._pendingRequests.next(this._pendingRequests.getValue().concat(pendingRequest))\n    })\n  }\n\n  private consumeRequest(requestKind: Web3Method) {\n    return firstValueFrom(\n      this._pendingRequests.pipe(\n        switchMap((a) => from(a)),\n        filter((request) => {\n          return request.requestInfo.method === requestKind\n        }),\n        first(),\n        tap((item) => {\n          this._pendingRequests.next(without(this._pendingRequests.getValue(), item))\n        }),\n      ),\n    )\n  }\n\n  private consumeAllRequests() {\n    const pendingRequests = this._pendingRequests.getValue()\n    this._pendingRequests.next([])\n    return pendingRequests\n  }\n\n  getPendingRequests(): PendingRequest['requestInfo'][] {\n    return this._pendingRequests.getValue().map((pendingRequest) => pendingRequest.requestInfo)\n  }\n\n  getPendingRequestCount(requestKind?: Web3Method): number {\n    const pendingRequests = this._pendingRequests.getValue()\n    if (!requestKind) {\n      return pendingRequests.length\n    }\n\n    return pendingRequests.filter((pendingRequest) => pendingRequest.requestInfo.method === requestKind).length\n  }\n\n  async authorize(requestKind: Web3Method): Promise<void> {\n    const pendingRequest = await this.consumeRequest(requestKind)\n    return pendingRequest.authorize()\n  }\n\n  async reject(requestKind: Web3Method, reason: ErrorWithCode = Deny()): Promise<void> {\n    const pendingRequest = await this.consumeRequest(requestKind)\n    return pendingRequest.reject(reason)\n  }\n\n  authorizeAll(): void {\n    this.consumeAllRequests().forEach((request) => request.authorize())\n  }\n\n  rejectAll(reason: ErrorWithCode = Deny()): void {\n    this.consumeAllRequests().forEach((request) => request.reject(reason))\n  }\n\n  async changeAccounts(signers: Signer[]): Promise<void> {\n    this._signers = signers\n    this.emit('accountsChanged', await Promise.all(this._signers.map((signer) => signer.getAddress())))\n  }\n\n  private getCurrentChain(): ChainConnection {\n    const chainConn = this.chains.find((chainConn) => chainConn.chainId === this._activeChainId)\n    if (!chainConn) {\n      throw Disconnected()\n    }\n    return chainConn\n  }\n\n  public getRpc(): ethers.providers.JsonRpcProvider {\n    const chainConn = this.getCurrentChain()\n    let rpc = this._rpc[chainConn.chainId]\n\n    if (!rpc) {\n      rpc = new ethers.providers.JsonRpcProvider(chainConn.rpcUrl, chainConn.chainId)\n      this._rpc[chainConn.chainId] = rpc\n    }\n\n    return rpc\n  }\n\n  getNetwork(): ChainConnection {\n    return this.getCurrentChain()\n  }\n\n  getNetworks(): ChainConnection[] {\n    return this.chains\n  }\n\n  addNetwork(chainId: number, rpcUrl: string): void {\n    this.chains.push({ chainId, rpcUrl })\n  }\n\n  switchNetwork(chainId: number): void {\n    const idx = this.chains.findIndex((connection) => connection.chainId === chainId)\n    if (idx < 0) {\n      throw UnrecognizedChainID()\n    }\n    if (chainId !== this._activeChainId) {\n      this._activeChainId = chainId\n      this.emit('chainChanged', chainId)\n    }\n  }\n}\n","export class ErrorWithCode extends Error {\n  constructor(\n    message?: string,\n    public code?: number,\n  ) {\n    super(message)\n    return this\n  }\n}\n\nexport const Deny = (): ErrorWithCode => new ErrorWithCode('The user rejected the request.', 4001)\n\nexport const Unauthorized = (): ErrorWithCode => new ErrorWithCode('The requested method and/or account has not been authorized by the user.', 4100)\n\nexport const UnsupportedMethod = (): ErrorWithCode => new ErrorWithCode('The Provider does not support the requested method.', 4200)\n\nexport const Disconnected = (): ErrorWithCode => new ErrorWithCode('The Provider is disconnected from all chains.', 4900)\n\nexport const ChainDisconnected = (): ErrorWithCode => new ErrorWithCode('The Provider is not connected to the requested chain.', 4901)\n\nexport const UnrecognizedChainID = (): ErrorWithCode =>\n  new ErrorWithCode('Unrecognized chain ID. Try adding the chain using `wallet_addEthereumChain` first.', 4902)\n","export class EventEmitter {\n  private readonly listeners: Record<string, Array<(...args: any[]) => void>> = Object.create(null)\n\n  emit(eventName: string, ...args: any[]): boolean {\n    this.listeners[eventName]?.forEach((listener) => {\n      listener(...args)\n    })\n    return true\n  }\n\n  on(eventName: string, listener: (...args: any[]) => void): this {\n    this.listeners[eventName] ??= []\n    this.listeners[eventName]?.push(listener)\n    return this\n  }\n\n  off(eventName: string, listener: (...args: any[]) => void): this {\n    const listeners = this.listeners[eventName] ?? []\n\n    // eslint-disable-next-line @typescript-eslint/ban-ts-comment\n    // @ts-ignore\n    for (const [i, listener_] of listeners.entries()) {\n      if (listener === listener_) {\n        listeners.splice(i, 1)\n        break\n      }\n    }\n\n    return this\n  }\n\n  once(eventName: string, listener: (...args: any[]) => void): this {\n    const cb = (...args: any[]): void => {\n      this.off(eventName, cb)\n      listener(...args)\n    }\n\n    return this.on(eventName, cb)\n  }\n}\n","import { Provider, TransactionRequest } from '@ethersproject/abstract-provider'\nimport { Deferrable } from '@ethersproject/properties'\nimport { serialize } from '@ethersproject/transactions'\nimport { IKey } from '@veramo/core'\nimport { Eip712Payload } from '@veramo/key-manager'\nimport { ethers, Signer, TypedDataDomain, TypedDataField } from 'ethers'\n// import {arrayify, defineReadOnly, serializeTransaction} from 'ethers/lib/utils'\nimport { arrayify, defineReadOnly } from 'ethers/lib/utils'\n// @ts-ignore\nimport { fromString } from 'uint8arrays/from-string'\n// import {ECDSASignature} from \"web3-eth-accounts\";\nimport { getAddressFromAgent } from './functions'\nimport { IRequiredContext, TypedDataSigner } from './types'\n\nexport class EthersKMSSignerBuilder {\n  private context?: IRequiredContext\n  private keyRef?: Pick<IKey, 'kid'>\n  private provider?: ethers.providers.Provider\n\n  withContext(context: IRequiredContext): this {\n    this.context = context\n    return this\n  }\n\n  withKid(kid: string): this {\n    this.keyRef = { kid }\n    return this\n  }\n\n  withKeyRef(keyRef: Pick<IKey, 'kid'> | string): this {\n    if (typeof keyRef === 'string') {\n      return this.withKid(keyRef)\n    }\n\n    this.keyRef = keyRef\n    return this\n  }\n\n  withProvider(provider: ethers.providers.Provider): this {\n    this.provider = provider\n    return this\n  }\n\n  build() {\n    if (!this.context) {\n      throw Error('Agent context needs to be provided')\n    }\n    if (!this.keyRef) {\n      throw Error('Keyref needs to be provided')\n    }\n    return new EthersKMSSigner({ context: this.context, keyRef: this.keyRef, provider: this.provider })\n  }\n}\n\n/**\n * This is a Ethers signer that delegates back to the KMS for the actual signatures.\n * This means we do not expose private keys and can use any Secp256k1 key stored in the KMS if we want\n *\n * Be aware that the provided KeyRef needs to belong to the respective KMS, as it will use a lookup for the key in the KMS to sign\n */\nexport class EthersKMSSigner extends Signer implements TypedDataSigner {\n  private readonly context: IRequiredContext\n  private readonly keyRef: Pick<IKey, 'kid'>\n\n  constructor({ provider, context, keyRef }: { provider?: ethers.providers.Provider; context: IRequiredContext; keyRef: Pick<IKey, 'kid'> }) {\n    super()\n    // defineReadOnly(this, \"address\", address);\n    defineReadOnly(this, 'provider', provider || undefined)\n    this.context = context\n    this.keyRef = keyRef\n  }\n\n  async getAddress(): Promise<string> {\n    return await getAddressFromAgent(this.context, this.keyRef)\n  }\n  async signTransaction(transaction: Deferrable<TransactionRequest>): Promise<string> {\n    const { from, ...tx } = await transaction\n\n    return this.context.agent.keyManagerSign({\n      algorithm: 'eth_signTransaction',\n      keyRef: this.keyRef.kid,\n      // keyRef: this.keyRef,\n      // @ts-ignore\n      data: arrayify(serialize(tx)),\n    })\n  }\n\n  async signRaw(message: string | Uint8Array): Promise<string> {\n    return await this.context.agent.keyManagerSign({\n      algorithm: 'eth_rawSign',\n      keyRef: this.keyRef.kid,\n      encoding: 'base16',\n      // @ts-ignore // KMS accepts uint8arrays but interface does not expose it\n      data: message,\n    })\n  }\n\n  async signMessage(message: string | Uint8Array): Promise<string> {\n    return await this.context.agent.keyManagerSign({\n      algorithm: 'eth_signMessage',\n      keyRef: this.keyRef.kid,\n      encoding: 'base16',\n      // @ts-ignore // KMS accepts uint8arrays but interface does not expose it\n      data: message,\n    })\n  }\n\n  async _signTypedData(domain: TypedDataDomain, types: Record<string, Array<TypedDataField>>, value: Record<string, any>): Promise<string> {\n    const jsonData: Partial<Eip712Payload> = {\n      domain,\n      types,\n      message: value,\n    }\n    return this.context.agent.keyManagerSign({\n      algorithm: 'eth_signTypedData',\n      keyRef: this.keyRef.kid,\n      // @ts-ignore // KMS accepts uint8arrays but interface does not expose it\n      data: fromString(JSON.stringify(jsonData)),\n    })\n  }\n\n  connect(provider?: Provider): EthersKMSSigner {\n    return new EthersKMSSigner({ provider, context: this.context, keyRef: this.keyRef })\n  }\n}\n\n/*\n/!**\n * Convert signature format of the `eth_sign` RPC method to signature parameters\n * NOTE: all because of a bug in geth: https://github.com/ethereum/go-ethereum/issues/2053\n *!/\nexport const fromRpcSig = function(sig: string): ECDSASignature {\n  const buf: Buffer = toBuffer(sig)\n\n  if (buf.length < 65) {\n    throw new Error('Invalid signature length')\n  }\n\n  let v = bufferToInt(buf.slice(64))\n  // support both versions of `eth_sign` responses\n  if (v < 27) {\n    v += 27\n  }\n\n  return {\n    v: v,\n    r: buf.slice(0, 32),\n    s: buf.slice(32, 64)\n  }\n}\n*/\n","import { IKey } from '@veramo/core'\nimport { ethers } from 'ethers'\nimport { IRequiredContext } from './types'\n\nexport async function getAddressFromAgent(context: IRequiredContext, keyRef: Pick<IKey, 'kid'>): Promise<string> {\n  const publicKeyHex = await getKey(context, keyRef).then((key) => key?.publicKeyHex)\n  if (!publicKeyHex) {\n    throw Error(`Could not retrieve public hex key for ${keyRef}`)\n  }\n  const address = ethers.utils.computeAddress(`${publicKeyHex.startsWith('0x') ? '' : '0x'}${publicKeyHex}`)\n  if (!address || !address.startsWith('0x')) {\n    throw Error(`Invalid address ${address} public key for key ${publicKeyHex}`)\n  }\n  return address\n}\n\nexport async function getKey(context: IRequiredContext, keyRef: Pick<IKey, 'kid'>): Promise<IKey | undefined> {\n  return await context.agent.keyManagerGet({ kid: keyRef.kid })\n}\n","import { Signer } from 'ethers'\nimport { EventEmitter } from './event-emitter'\nimport { IWeb3Provider, Web3ProviderConfig } from './types'\nimport { EthersHeadlessProvider } from './ethers-headless-provider'\n\ntype Fn = (...args: any[]) => any\n\nfunction relayEvents(\n  eventEmitter: EventEmitter,\n  execute: <T extends keyof IWeb3Provider>(method: T, ...args: IWeb3Provider[T] extends Fn ? Parameters<IWeb3Provider[T]> : []) => Promise<void>,\n): void {\n  const emit_ = eventEmitter.emit\n  eventEmitter.emit = (eventName, ...args) => {\n    void execute('emit', eventName, ...args)\n    return emit_.apply(eventEmitter, [eventName, ...args])\n  }\n}\n\nexport function createWeb3Provider(\n  signers: Signer[],\n  chainId: number | number[],\n  rpcUrl: string,\n  evaluate: <T extends keyof IWeb3Provider>(\n    method: T,\n    ...args: IWeb3Provider[T] extends Fn ? Parameters<IWeb3Provider[T]> : []\n  ) => Promise<void> = async () => {},\n  config?: Web3ProviderConfig,\n): IWeb3Provider {\n  const chainIds: number[] = Array.isArray(chainId) ? chainId : [chainId]\n  const chains = chainIds.map((chainId) => {\n    return { chainId, rpcUrl }\n  })\n  const web3Provider = new EthersHeadlessProvider(signers, chains, config)\n  relayEvents(web3Provider, evaluate)\n  return web3Provider\n}\n","import { ExpressSupport, ISingleEndpointOpts, sendErrorResponse } from '@sphereon/ssi-express-support'\nimport { Router } from 'express'\nimport { EthersHeadlessProvider } from './ethers-headless-provider'\nimport { Web3Method } from './types'\n\nexport function createRpcServer(\n  provider: EthersHeadlessProvider,\n  expressSupport: ExpressSupport,\n  opts?: ISingleEndpointOpts & { basePath?: string },\n) {\n  const express = expressSupport.express\n  const router = Router()\n  // const app = expressSupport.express\n  // app.post(opts?.basePath ?? \"/web3/rpc\", (req, res, next) => {console.log(`${JSON.stringify(req.body, null,2)}`); next()} , rpcHandler(createService(provider)));\n  const path = opts?.path ?? '/web3/rpc'\n  console.log(`RPC server will use basePath ${opts?.basePath ?? '/'} and path ${path}`)\n  router.post(\n    path,\n    (req, res, next) => {\n      console.log(`REQ ${req.body?.method}:\\r\\n${JSON.stringify(req.body, null, 2)}\\r\\n===`)\n      next()\n    },\n    async (req, res, next) => {\n      try {\n        const method = req.body.method\n        const params = req.body.params\n        const id = req.body.id\n\n        // todo: A Notification is a Request object without an \"id\" member.\n        //  A Request object that is a Notification signifies the Client's lack of interest in the corresponding Response object,\n        //  and as such no Response object needs to be returned to the client. The Server MUST NOT reply to a Notification, including those that are within a batch request.\n        if (req.body.jsonrpc !== '2.0') {\n          console.log('No valid JSON RPC call received', JSON.stringify(req.body))\n          return sendErrorResponse(res, 200, {\n            id: req.body.id,\n            jsonrpc: '2.0',\n            error: 'No valid JSON RPC call received. No jsonrp version supplied',\n            code: -32600,\n          })\n        } else if (!id || !method) {\n          console.log('No valid JSON RPC call received', JSON.stringify(req.body))\n          return sendErrorResponse(res, 200, {\n            id: req.body.id,\n            jsonrpc: '2.0',\n            error: 'No valid JSON RPC call received',\n            code: -32600,\n          })\n        }\n        const result = provider.request({ method, params })\n        provider.authorizeAll()\n        const respBody = { id, jsonrpc: '2.0', result: await result }\n        res.json(respBody)\n        console.log(`RESPONSE for ${method}:\\r\\n${JSON.stringify(respBody, null, 2)}`)\n      } catch (error) {\n        console.log(error.message)\n        let msg = error.message\n        if (`body` in error) {\n          msg = error.body\n          return sendErrorResponse(res, 200, msg)\n          // res.json(error.body)\n        } else {\n          return sendErrorResponse(res, 200, {\n            id: req.body.id,\n            jsonrpc: '2.0',\n            error: msg,\n            code: error.code ?? -32000,\n          })\n        }\n      }\n      return next()\n    },\n  )\n  express.use(opts?.basePath ?? 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