feat(widget): constrain specific token pairs

apps/cowswap-frontend/src/locales/en-US.po

@@ -5105,6 +5105,10 @@ msgstr "Order Creation Failed"
 msgid "This wallet is not yet supported"
 msgstr "This wallet is not yet supported"
 
+#: apps/cowswap-frontend/src/modules/tradeFormValidation/pure/TradeFormButtons/tradeButtonsMap.tsx
+msgid "The token pair is constrained"
+msgstr "The token pair is constrained"
+
 #: apps/cowswap-frontend/src/modules/affiliate/containers/AffiliatePartnerCodeInfo.tsx
 #: apps/cowswap-frontend/src/modules/ordersTable/pure/ReceiptModal/ReceiptModal.modal.tsx
 msgid "Created"

apps/cowswap-frontend/src/modules/tradeFormValidation/pure/TradeFormButtons/tradeButtonsMap.tsx

@@ -403,4 +403,7 @@ export const tradeButtonsMap: Record<TradeFormValidation, ButtonErrorConfig | Bu
       </TradeFormBlankButton>
     )
   },
+  [TradeFormValidation.WidgetConstrainedTokenPair]: {
+    text: <Trans>The token pair is constrained</Trans>,
+  },
 }

apps/cowswap-frontend/src/modules/tradeFormValidation/services/validateTradeForm.test.ts

@@ -32,6 +32,7 @@ describe('validateTradeForm - xStock logic', () => {
       recipient: '0x123',
       isQuoteBasedOrder: true,
       tradeType: TradeType.SWAP,
+      slippage: null,
     },
     tradeQuote: { isLoading: false } as unknown as TradeQuoteState,
     isOnline: true,
@@ -48,12 +49,13 @@ describe('validateTradeForm - xStock logic', () => {
     intermediateTokenToBeImported: false,
     isAccountProxyLoading: false,
     isProxySetupValid: true,
-    customTokenError: null,
+    customTokenError: undefined,
     isRestrictedForCountry: false,
     isBalancesLoading: false,
     isBundlingSupported: true,
     isInputCurrencyXstock: false,
     isOutputCurrencyXstock: false,
+    injectedWidgetParams: {},
   }
 
   test('shows xStock minimum trade size for sell orders when xStock sell amount is below $10', () => {

apps/cowswap-frontend/src/modules/tradeFormValidation/services/validateTradeForm.ts

@@ -1,5 +1,5 @@
-import { getIsNativeToken, isFractionFalsy, isSellOrder } from '@cowprotocol/common-utils'
-import { isEvmChain } from '@cowprotocol/cow-sdk'
+import { getCurrencyAddress, getIsNativeToken, isFractionFalsy, isSellOrder } from '@cowprotocol/common-utils'
+import { areAddressesEqual, isEvmChain } from '@cowprotocol/cow-sdk'
 
 import { TradeType } from 'modules/trade'
 import { getIsFastQuote, isQuoteExpired } from 'modules/tradeQuote'
@@ -90,6 +90,21 @@ export function validateTradeForm(context: TradeFormValidationContext): TradeFor
     return [TradeFormValidation.XstockMinimumTradeSize]
   }
 
+  if (injectedWidgetParams.tokenPairConstraints && inputCurrency && outputCurrency) {
+    const isTradeConstrained = injectedWidgetParams.tokenPairConstraints.some((rule) => {
+      return (
+        rule.sell.chainId === inputCurrency.chainId &&
+        areAddressesEqual(rule.sell.address, getCurrencyAddress(inputCurrency)) &&
+        rule.buy.chainId === outputCurrency.chainId &&
+        areAddressesEqual(rule.buy.address, getCurrencyAddress(outputCurrency))
+      )
+    })
+
+    if (isTradeConstrained) {
+      validations.push(TradeFormValidation.WidgetConstrainedTokenPair)
+    }
+  }
+
   if (!isWrapUnwrap && tradeQuote.error) {
     if (inputAmountIsNotSet) {
       validations.push(TradeFormValidation.InputAmountNotSet)

apps/cowswap-frontend/src/modules/tradeFormValidation/types.ts

@@ -116,4 +116,5 @@ export enum TradeFormValidation {
   // Widget controlled
   DisableTradeWithUnknownPriceImpact,
   DisableTradeWithHighPriceImpact,
+  WidgetConstrainedTokenPair,
 }

libs/widget-lib/src/types.ts

@@ -450,6 +450,14 @@ export interface CowSwapWidgetParams {
     whenPriceImpactIsHigherThan?: number
   }
 
+  /**
+   * Disables trading of specific token pair
+   */
+  tokenPairConstraints?: {
+    sell: { address: string; chainId: SupportedChainId }
+    buy: { address: string; chainId: SupportedChainId }
+  }[]
+
   hooks?: Partial<{
     onBeforeApproval(payload: OnApprovalPayload): WidgetHookResult
     onBeforeWrapOrUnwrap(payload: OnTradeParamsPayload): WidgetHookResult