add getFeeTokens to dapp client (#889)

* add getFeeTokens to dapp client

* fix typo

Author: VGabriel45

packages/wallet/dapp-client/src/ChainSessionManager.ts

@@ -41,6 +41,7 @@ import {
   ModifyExplicitSessionPayload,
   SessionResponse,
   AddExplicitSessionPayload,
+  GetFeeTokensResponse,
 } from './types/index.js'
 import { CACHE_DB_NAME, VALUE_FORWARDER_ADDRESS } from './utils/constants.js'
 import { ExplicitSession, ImplicitSession, ExplicitSessionConfig } from './index.js'
@@ -780,6 +781,19 @@ export class ChainSessionManager {
     }
   }
 
+  /**
+   * Fetches fee tokens for a chain.
+   * @returns {GetFeeTokensResponse}
+   * @throws {FeeOptionError} If fetching fee tokens fails.
+   */
+  async getFeeTokens(): Promise<GetFeeTokensResponse> {
+    try {
+      return await this.relayer.feeTokens()
+    } catch (err) {
+      throw new FeeOptionError(`Failed to get fee tokens: ${err instanceof Error ? err.message : String(err)}`)
+    }
+  }
+
   /**
    * Builds, signs, and sends a batch of transactions.
    * @param transactions The transactions to be sent.

packages/wallet/dapp-client/src/DappClient.ts

@@ -15,6 +15,7 @@ import { SequenceStorage, WebStorage } from './utils/storage.js'
 import {
   DappClientExplicitSessionEventListener,
   DappClientWalletActionEventListener,
+  GetFeeTokensResponse,
   GuardConfig,
   LoginMethod,
   RandomPrivateKeyFn,
@@ -561,6 +562,19 @@ export class DappClient {
     return await chainSessionManager.getFeeOptions(transactions)
   }
 
+  /**
+   * Fetches fee tokens for a chain.
+   * @returns A promise that resolves with the fee tokens response. {@link GetFeeTokensResponse}
+   * @throws If the fee tokens cannot be fetched. {@link InitializationError}
+   */
+  async getFeeTokens(chainId: number): Promise<GetFeeTokensResponse> {
+    if (!this.isInitialized) throw new InitializationError('Not initialized')
+    const chainSessionManager = this.getChainSessionManager(chainId)
+    if (!chainSessionManager.isInitialized)
+      throw new InitializationError(`ChainSessionManager for chain ${chainId} is not initialized.`)
+    return await chainSessionManager.getFeeTokens()
+  }
+
   /**
    * Checks if the current session has permission to execute a set of transactions on a specific chain.
    * @param chainId The chain ID on which to check the permissions.

packages/wallet/dapp-client/src/types/index.ts

@@ -1,5 +1,5 @@
 /* eslint-disable @typescript-eslint/no-explicit-any */
-import { ExplicitSession } from '@0xsequence/wallet-core'
+import { ExplicitSession, Relayer } from '@0xsequence/wallet-core'
 import { Attestation, Payload } from '@0xsequence/wallet-primitives'
 import { Address, Hex } from 'ox'
 import type { TypedData } from 'ox/TypedData'
@@ -180,3 +180,9 @@ export interface SendRequestOptions {
   timeout?: number
   path?: string
 }
+
+export type GetFeeTokensResponse = {
+  isFeeRequired: boolean
+  tokens?: Relayer.Standard.Rpc.FeeToken[]
+  paymentAddress?: Address.Address
+}