Additional swaps network support (#10721)

* Add swaps support for bnc chain

* Use single default token address in shared/constants/swaps

shared/constants/swaps.js

@@ -7,21 +7,29 @@ export const QUOTES_NOT_AVAILABLE_ERROR = 'quotes-not-avilable';
 export const OFFLINE_FOR_MAINTENANCE = 'offline-for-maintenance';
 export const SWAPS_FETCH_ORDER_CONFLICT = 'swaps-fetch-order-conflict';
 
-// An address that the metaswap-api recognizes as ETH, in place of the token address that ERC-20 tokens have
-const ETH_SWAPS_TOKEN_ADDRESS = '0x0000000000000000000000000000000000000000';
+// An address that the metaswap-api recognizes as the default token for the current network, in place of the token address that ERC-20 tokens have
+const DEFAULT_TOKEN_ADDRESS = '0x0000000000000000000000000000000000000000';
 
 export const ETH_SWAPS_TOKEN_OBJECT = {
   symbol: 'ETH',
   name: 'Ether',
-  address: ETH_SWAPS_TOKEN_ADDRESS,
+  address: DEFAULT_TOKEN_ADDRESS,
   decimals: 18,
   iconUrl: 'images/black-eth-logo.svg',
 };
 
+const BNB_SWAPS_TOKEN_OBJECT = {
+  symbol: 'BNB',
+  name: 'Binance Coin',
+  address: DEFAULT_TOKEN_ADDRESS,
+  decimals: 18,
+  iconUrl: 'images/bnb.png',
+};
+
 const TEST_ETH_SWAPS_TOKEN_OBJECT = {
   symbol: 'TESTETH',
   name: 'Test Ether',
-  address: ETH_SWAPS_TOKEN_ADDRESS,
+  address: DEFAULT_TOKEN_ADDRESS,
   decimals: 18,
   iconUrl: 'images/black-eth-logo.svg',
 };
@@ -33,27 +41,36 @@ const MAINNET_CONTRACT_ADDRESS = '0x881d40237659c251811cec9c364ef91dc08d300c';
 
 const TESTNET_CONTRACT_ADDRESS = '0x881d40237659c251811cec9c364ef91dc08d300c';
 
+const BSC_CONTRACT_ADDRESS = '0x1a1ec25DC08e98e5E93F1104B5e5cdD298707d31';
+
 const METASWAP_ETH_API_HOST = 'https://api.metaswap.codefi.network';
 
+const METASWAP_BNB_API_HOST = 'https://bsc-api.metaswap.codefi.network';
+const BNB_CHAIN_ID = '0x38';
+
 const SWAPS_TESTNET_CHAIN_ID = '0x539';
 const SWAPS_TESTNET_HOST = 'https://metaswap-api.airswap-dev.codefi.network';
 
 export const ALLOWED_SWAPS_CHAIN_IDS = {
   [MAINNET_CHAIN_ID]: true,
   [SWAPS_TESTNET_CHAIN_ID]: true,
+  [BNB_CHAIN_ID]: true,
 };
 
 export const METASWAP_CHAINID_API_HOST_MAP = {
   [MAINNET_CHAIN_ID]: METASWAP_ETH_API_HOST,
   [SWAPS_TESTNET_CHAIN_ID]: SWAPS_TESTNET_HOST,
+  [BNB_CHAIN_ID]: METASWAP_BNB_API_HOST,
 };
 
 export const SWAPS_CHAINID_CONTRACT_ADDRESS_MAP = {
   [MAINNET_CHAIN_ID]: MAINNET_CONTRACT_ADDRESS,
   [SWAPS_TESTNET_CHAIN_ID]: TESTNET_CONTRACT_ADDRESS,
+  [BNB_CHAIN_ID]: BSC_CONTRACT_ADDRESS,
 };
 
 export const SWAPS_CHAINID_DEFAULT_TOKEN_MAP = {
   [MAINNET_CHAIN_ID]: ETH_SWAPS_TOKEN_OBJECT,
   [SWAPS_TESTNET_CHAIN_ID]: TEST_ETH_SWAPS_TOKEN_OBJECT,
+  [BNB_CHAIN_ID]: BNB_SWAPS_TOKEN_OBJECT,
 };