feat: add tokenlist validation (#6504)

* feat: add tokenlist validation

* use alternative for spread operator

* maintain tokenlists version and use original ajv version

* bump ajv

* Revert "bump ajv"

This reverts commit b9d2dd61c61f4aeedc00faf034c5a6e89b0d28fc.

* rename vars in validator

* update gitignore

* nit fixes

* test

* add ^ back

* remove ^

* removed and readded ajv

* try require.resolve

* Revert "try require.resolve"

This reverts commit 62f58bcb7f02f1ead430a4c94ca3428a60d4d4c5.

* bump eslint-config

* yarn lock merge conflict

* bring back spread operator

* remove redundant lint ignore

.gitignore

@@ -8,8 +8,10 @@
 /src/locales/**/en-US.po
 /src/locales/**/pseudo.po
 
-# generated graphql types
-/src/graphql/**/__generated__
+# generated files
+/src/**/__generated__
+
+# schema
 schema.graphql
 
 # dependencies

package.json

@@ -16,7 +16,8 @@
     "i18n:extract": "lingui extract --locale en-US",
     "i18n:compile": "yarn i18n:extract && lingui compile",
     "i18n:pseudo": "lingui extract --locale pseudo && lingui compile",
-    "prepare": "yarn contracts:compile && yarn graphql:fetch && yarn graphql:generate && yarn i18n:compile",
+    "ajv:compile": "node scripts/compile-ajv-validators.js",
+    "prepare": "yarn contracts:compile && yarn graphql:fetch && yarn graphql:generate && yarn i18n:compile && yarn ajv:compile",
     "start": "craco start",
     "build": "craco build",
     "build:e2e": "REACT_APP_CSP_ALLOW_UNSAFE_EVAL=true REACT_APP_ADD_COVERAGE_INSTRUMENTATION=true craco build",
@@ -96,8 +97,8 @@
     "@types/ua-parser-js": "^0.7.35",
     "@types/uuid": "^8.3.4",
     "@types/wcag-contrast": "^3.0.0",
+    "@uniswap/eslint-config": "^1.2.0",
     "@uniswap/default-token-list": "^9.4.0",
-    "@uniswap/eslint-config": "^1.1.1",
     "@vanilla-extract/babel-plugin": "^1.1.7",
     "@vanilla-extract/jest-transform": "^1.1.1",
     "@vanilla-extract/webpack-plugin": "^2.1.11",
@@ -190,6 +191,8 @@
     "@web3-react/types": "^8.2.0",
     "@web3-react/url": "^8.2.0",
     "@web3-react/walletconnect": "^8.2.0",
+    "ajv": "^8.11.0",
+    "ajv-formats": "^2.1.1",
     "array.prototype.flat": "^1.2.4",
     "array.prototype.flatmap": "^1.2.4",
     "cids": "^1.0.0",

scripts/compile-ajv-validators.js

+/* eslint-env node */
+
+const fs = require('fs')
+const path = require('path')
+const Ajv = require('ajv')
+const standaloneCode = require('ajv/dist/standalone').default
+const addFormats = require('ajv-formats')
+const schema = require('@uniswap/token-lists/dist/tokenlist.schema.json')
+
+const tokenListAjv = new Ajv({ code: { source: true, esm: true } })
+addFormats(tokenListAjv)
+const validateTokenList = tokenListAjv.compile(schema)
+let tokenListModuleCode = standaloneCode(tokenListAjv, validateTokenList)
+fs.writeFileSync(path.join(__dirname, '../src/utils/__generated__/validateTokenList.js'), tokenListModuleCode)
+
+const tokensAjv = new Ajv({ code: { source: true, esm: true } })
+addFormats(tokensAjv)
+const validateTokens = tokensAjv.compile({ ...schema, required: ['tokens'] })
+let tokensModuleCode = standaloneCode(tokensAjv, validateTokens)
+fs.writeFileSync(path.join(__dirname, '../src/utils/__generated__/validateTokens.js'), tokensModuleCode)

src/lib/hooks/useTokenList/fetchTokenList.ts

 import type { TokenList } from '@uniswap/token-lists'
-import { validateTokenList } from '@uniswap/widgets'
 import contenthashToUri from 'lib/utils/contenthashToUri'
 import parseENSAddress from 'lib/utils/parseENSAddress'
 import uriToHttp from 'lib/utils/uriToHttp'
+import { validateTokenList } from 'utils/validateTokenList'
 
 export const DEFAULT_TOKEN_LIST = 'https://gateway.ipfs.io/ipns/tokens.uniswap.org'
 

src/utils/validateTokenList.test.ts

+import { TokenInfo } from '@uniswap/token-lists'
+
+import { validateTokens } from './validateTokenList'
+
+const INVALID_TOKEN: TokenInfo = {
+  name: 'Dai Stablecoin',
+  address: '0xD3ADB33F',
+  symbol: 'DAI',
+  decimals: 18,
+  chainId: 1,
+}
+
+const INLINE_TOKEN_LIST = [
+  {
+    name: 'Dai Stablecoin',
+    address: '0x6B175474E89094C44Da98b954EedeAC495271d0F',
+    symbol: 'DAI',
+    decimals: 18,
+    chainId: 1,
+    logoURI:
+      'https://raw.githubusercontent.com/trustwallet/assets/master/blockchains/ethereum/assets/0x6B175474E89094C44Da98b954EedeAC495271d0F/logo.png',
+  },
+  {
+    name: 'USDCoin',
+    address: '0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48',
+    symbol: 'USDC',
+    decimals: 6,
+    chainId: 1,
+    logoURI:
+      'https://raw.githubusercontent.com/trustwallet/assets/master/blockchains/ethereum/assets/0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48/logo.png',
+  },
+]
+
+describe('validateTokens', () => {
+  it('throws on invalid tokens', async () => {
+    await expect(validateTokens([INVALID_TOKEN])).rejects.toThrow(/^Tokens failed validation:.*address/)
+  })
+
+  it('validates the passed token info', async () => {
+    await expect(validateTokens(INLINE_TOKEN_LIST)).resolves.toBe(INLINE_TOKEN_LIST)
+  })
+})

src/utils/validateTokenList.ts

+import type { TokenInfo, TokenList } from '@uniswap/token-lists'
+import type { ValidateFunction } from 'ajv'
+
+enum ValidationSchema {
+  LIST = 'list',
+  TOKENS = 'tokens',
+}
+
+function getValidationErrors(validate: ValidateFunction | undefined): string {
+  return (
+    validate?.errors?.map((error) => [error.instancePath, error.message].filter(Boolean).join(' ')).join('; ') ??
+    'unknown error'
+  )
+}
+
+async function validate(schema: ValidationSchema, data: unknown): Promise<unknown> {
+  let validatorImport
+  switch (schema) {
+    case ValidationSchema.LIST:
+      validatorImport = import('utils/__generated__/validateTokenList')
+      break
+    case ValidationSchema.TOKENS:
+      validatorImport = import('utils/__generated__/validateTokens')
+      break
+    default:
+      throw new Error('No validation function specified for token list schema')
+  }
+
+  const [, validatorModule] = await Promise.all([import('ajv'), validatorImport])
+  const validator = (await validatorModule.default) as ValidateFunction
+  if (validator?.(data)) {
+    return data
+  }
+  throw new Error(getValidationErrors(validator))
+}
+
+/**
+ * Validates an array of tokens.
+ * @param json the TokenInfo[] to validate
+ */
+export async function validateTokens(json: TokenInfo[]): Promise<TokenInfo[]> {
+  try {
+    await validate(ValidationSchema.TOKENS, { tokens: json })
+    return json
+  } catch (error) {
+    throw new Error(`Tokens failed validation: ${error.message}`)
+  }
+}
+
+/**
+ * Validates a token list.
+ * @param json the TokenList to validate
+ */
+export async function validateTokenList(json: TokenList): Promise<TokenList> {
+  try {
+    await validate(ValidationSchema.LIST, json)
+    return json
+  } catch (error) {
+    throw new Error(`Token list failed validation: ${error.message}`)
+  }
+}

yarn.lock

@@ -5172,10 +5172,10 @@
   resolved "https://registry.yarnpkg.com/@uniswap/default-token-list/-/default-token-list-9.4.0.tgz#60c4d249b3be5d0123480e5a4fd092a1fd10ef0c"
   integrity sha512-PsYsEPpFs0CIjWHel2FDPo6T/EkZ+RuH9NfX55FbMbZMTuw9TSQEfl8p1fYt6KAMWi0Zy/Mfqp16y+OiYJyoBA==
 
-"@uniswap/eslint-config@^1.1.1":
-  version "1.1.1"
-  resolved "https://registry.yarnpkg.com/@uniswap/eslint-config/-/eslint-config-1.1.1.tgz#83d2633dad6507ca58bc11c8892035812059488e"
-  integrity sha512-vND/oJTmGCxYpY0E+iXWZT0mJT21/Ryf48yLP0kyWNnXzB5WyJuqei2gHx3nr+HWwRNF6aEbToRr9jNh+J3uBg==
+"@uniswap/eslint-config@^1.2.0":
+  version "1.2.0"
+  resolved "https://registry.yarnpkg.com/@uniswap/eslint-config/-/eslint-config-1.2.0.tgz#1d9565c5ae5982fc0e3585b272e15b89b64b2db0"
+  integrity sha512-hxCmKRbCckQql+/ZKiZBpIm7btexTZ2SRq3lcg3MHDB3VurdIycKSIBGSyxJxAryMC2b83/SubiZ8wNCjP55sQ==
   dependencies:
     "@rushstack/eslint-patch" "^1.2.0"
     "@typescript-eslint/eslint-plugin" "^5.45.1"