3rd party init data validation utilities

.changeset/eleven-badgers-smile.md

@@ -0,0 +1,5 @@
+---
+"@telegram-apps/init-data-node": minor
+---
+
+Add utilities related to 3-rd party validation. Git rid of Node.js `Buffer`.

.changeset/mean-tomatoes-search.md

@@ -0,0 +1,5 @@
+---
+"@telegram-apps/types": minor
+---
+
+Define InitData.signature.

.changeset/perfect-icons-kiss.md

@@ -0,0 +1,5 @@
+---
+"@telegram-apps/transformers": minor
+---
+
+Add InitData.signature transformer.

apps/docs/packages/telegram-apps-init-data-node.md

@@ -1,3 +1,7 @@
+---
+outline: [2, 3]
+---
+
 # @telegram-apps/init-data-node
 
 <p style="display: flex; gap: 8px; min-height: 20px">
@@ -133,6 +137,45 @@ duration is set to 1 day (86,400 seconds). It is recommended to always check the
 initialization data, as it could be stolen but still remain valid. To disable this feature,
 pass `{ expiresIn: 0 }` as the third argument.
 
+### `validate3rd`
+
+The `validate3rd` function is used to check if the passed init data was signed by Telegram. As
+well as the `validate` function, this one accepts the init data in the same format.
+
+As the second argument, it accepts the Telegram Bot identifier that was used to sign this
+init data.
+
+The third argument is an object with the following properties:
+
+- `expiresIn` is responsible for init data expiration validation
+- `test: boolean`: should be equal `true` if the init data was received in the test Telegram
+  environment
+
+Here is the usage example:
+
+```ts
+const initData =
+  'user=%7B%22id%22%3A279058397%2C%22first_name%22%3A%22Vladislav%20%2B%20-%20%3F%20%5C%2F%22%2C%22last_name%22%3A%22Kibenko%22%2C%22username%22%3A%22vdkfrost%22%2C%22language_code%22%3A%22ru%22%2C%22is_premium%22%3Atrue%2C%22allows_write_to_pm%22%3Atrue%2C%22photo_url%22%3A%22https%3A%5C%2F%5C%2Ft.me%5C%2Fi%5C%2Fuserpic%5C%2F320%5C%2F4FPEE4tmP3ATHa57u6MqTDih13LTOiMoKoLDRG4PnSA.svg%22%7D' +
+  '&chat_instance=8134722200314281151' +
+  '&chat_type=private' +
+  '&auth_date=1733584787' +
+  '&signature=zL-ucjNyREiHDE8aihFwpfR9aggP2xiAo3NSpfe-p7IbCisNlDKlo7Kb6G4D0Ao2mBrSgEk4maLSdv6MLIlADQ' +
+  '&hash=2174df5b000556d044f3f020384e879c8efcab55ddea2ced4eb752e93e7080d6';
+const botId = 7342037359;
+
+await validate3rd(initData, botId);
+```
+
+Function will throw an error in one of these cases:
+
+- `ERR_AUTH_DATE_INVALID`: `auth_date` is empty or not found
+- `ERR_SIGNATURE_MISSING`: `signature` is empty or not found
+- `ERR_SIGN_INVALID`: signature is invalid
+- `ERR_EXPIRED`: init data expired
+
+> [!WARNING]
+> This function uses **Web Crypto API** instead of Node.js modules.
+
 ### `isValid`
 
 Alternatively, to check the init data validity, a developer could use the `isValid` function.
@@ -141,11 +184,26 @@ It doesn't throw an error, but returns a boolean value indicating the init data
 ```ts
 import { isValid } from '@telegram-apps/init-data-node';
 
-if (isValid('init-data')) {
+if (isValid('init-data', 'my-bot-token')) {
   console.log('Init data is fine');
 }
 ```
 
+### `isValid3rd`
+
+Does the same as the `isValid` function, but checks if the init data was signed by Telegram:
+
+```ts
+import { isValid3rd } from '@telegram-apps/init-data-node';
+
+if (await isValid3rd('init-data')) {
+  console.log('Init data is fine');
+}
+```
+
+> [!WARNING]
+> This function uses **Web Crypto API** instead of Node.js modules.
+
 ## Signing
 
 There could be some cases when a developer needs to create their own init data. For instance,

packages/bridge/src/env/mockTelegramEnv.test.ts

@@ -43,15 +43,16 @@ const lp: LaunchParams = {
       lastName: 'Rogue',
       username: 'rogue',
     },
+    signature: 'abc',
   },
-  initDataRaw: 'user=%7B%22id%22%3A99281932%2C%22first_name%22%3A%22Andrew%22%2C%22last_name%22%3A%22Rogue%22%2C%22username%22%3A%22rogue%22%2C%22language_code%22%3A%22en%22%2C%22is_premium%22%3Atrue%2C%22allows_write_to_pm%22%3Atrue%7D&chat_instance=8428209589180549439&chat_type=sender&start_param=debug&auth_date=1716922846&hash=89d6079ad6762351f38c6dbbc41bb53048019256a9443988af7a48bcad16ba31',
+  initDataRaw: 'user=%7B%22id%22%3A99281932%2C%22first_name%22%3A%22Andrew%22%2C%22last_name%22%3A%22Rogue%22%2C%22username%22%3A%22rogue%22%2C%22language_code%22%3A%22en%22%2C%22is_premium%22%3Atrue%2C%22allows_write_to_pm%22%3Atrue%7D&chat_instance=8428209589180549439&chat_type=sender&start_param=debug&auth_date=1716922846&hash=89d6079ad6762351f38c6dbbc41bb53048019256a9443988af7a48bcad16ba31&signature=abc',
   version: '7.2',
   platform: 'tdesktop',
   botInline: false,
   showSettings: false
 };
 
-const lpString = 'tgWebAppPlatform=tdesktop&tgWebAppThemeParams=%7B%22accent_text_color%22%3A%22%236ab2f2%22%2C%22bg_color%22%3A%22%2317212b%22%2C%22button_color%22%3A%22%235288c1%22%2C%22button_text_color%22%3A%22%23ffffff%22%2C%22destructive_text_color%22%3A%22%23ec3942%22%2C%22header_bg_color%22%3A%22%2317212b%22%2C%22hint_color%22%3A%22%23708499%22%2C%22link_color%22%3A%22%236ab3f3%22%2C%22secondary_bg_color%22%3A%22%23232e3c%22%2C%22section_bg_color%22%3A%22%2317212b%22%2C%22section_header_text_color%22%3A%22%236ab3f3%22%2C%22subtitle_text_color%22%3A%22%23708499%22%2C%22text_color%22%3A%22%23f5f5f5%22%7D&tgWebAppVersion=7.2&tgWebAppData=user%3D%257B%2522id%2522%253A99281932%252C%2522first_name%2522%253A%2522Andrew%2522%252C%2522last_name%2522%253A%2522Rogue%2522%252C%2522username%2522%253A%2522rogue%2522%252C%2522language_code%2522%253A%2522en%2522%252C%2522is_premium%2522%253Atrue%252C%2522allows_write_to_pm%2522%253Atrue%257D%26chat_instance%3D8428209589180549439%26chat_type%3Dsender%26start_param%3Ddebug%26auth_date%3D1716922846%26hash%3D89d6079ad6762351f38c6dbbc41bb53048019256a9443988af7a48bcad16ba31&tgWebAppShowSettings=0&tgWebAppBotInline=0';
+const lpString = 'tgWebAppPlatform=tdesktop&tgWebAppThemeParams=%7B%22accent_text_color%22%3A%22%236ab2f2%22%2C%22bg_color%22%3A%22%2317212b%22%2C%22button_color%22%3A%22%235288c1%22%2C%22button_text_color%22%3A%22%23ffffff%22%2C%22destructive_text_color%22%3A%22%23ec3942%22%2C%22header_bg_color%22%3A%22%2317212b%22%2C%22hint_color%22%3A%22%23708499%22%2C%22link_color%22%3A%22%236ab3f3%22%2C%22secondary_bg_color%22%3A%22%23232e3c%22%2C%22section_bg_color%22%3A%22%2317212b%22%2C%22section_header_text_color%22%3A%22%236ab3f3%22%2C%22subtitle_text_color%22%3A%22%23708499%22%2C%22text_color%22%3A%22%23f5f5f5%22%7D&tgWebAppVersion=7.2&tgWebAppData=user%3D%257B%2522id%2522%253A99281932%252C%2522first_name%2522%253A%2522Andrew%2522%252C%2522last_name%2522%253A%2522Rogue%2522%252C%2522username%2522%253A%2522rogue%2522%252C%2522language_code%2522%253A%2522en%2522%252C%2522is_premium%2522%253Atrue%252C%2522allows_write_to_pm%2522%253Atrue%257D%26chat_instance%3D8428209589180549439%26chat_type%3Dsender%26start_param%3Ddebug%26auth_date%3D1716922846%26hash%3D89d6079ad6762351f38c6dbbc41bb53048019256a9443988af7a48bcad16ba31%26signature%3Dabc&tgWebAppShowSettings=0&tgWebAppBotInline=0';
 
 it('should save passed launch parameters in session storage', () => {
   const setItem = mockSessionStorageSetItem();

packages/bridge/src/utils/request.test.ts

@@ -85,18 +85,18 @@ describe('options', () => {
       expect(globalPostEvent).toHaveBeenCalledWith('web_app_request_phone', undefined);
     });
 
-    it('should reject promise if postEvent threw an error', () => {
+    it('should reject promise if postEvent threw an error', async () => {
       const promise = request('web_app_request_phone', 'phone_requested', {
         postEvent() {
           throw new Error('Nope!');
         },
       });
-      void expect(promise).rejects.toStrictEqual(new Error('Nope!'));
+      await expect(promise).rejects.toStrictEqual(new Error('Nope!'));
     });
   });
 
   describe('capture', () => {
-    it('should capture an event in case, capture method returned true', () => {
+    it('should capture an event in case, capture method returned true', async () => {
       const promise = request('web_app_request_phone', 'phone_requested', {
         timeout: 1000,
         capture: ({ status }) => status === 'allowed',

packages/init-data-node/src/converters/arrayBufferToHex.ts

@@ -0,0 +1,10 @@
+/**
+ * Converts array buffer to hex.
+ * @param buffer - buffer to convert
+ */
+export function arrayBufferToHex(buffer: ArrayBuffer): string {
+  return new Uint8Array(buffer).reduce((acc, byte) => {
+    // Convert byte to hex and pad with zero if needed (e.g., "0a" instead of "a")
+    return acc + byte.toString(16).padStart(2, '0');
+  }, '');
+}

packages/init-data-node/src/converters/hexToArrayBuffer.ts

@@ -0,0 +1,17 @@
+/**
+ * Converts a hex string to ArrayBuffer.
+ * @param hexString - value to convert.
+ */
+export function hexToArrayBuffer(hexString: string): ArrayBuffer {
+  if (hexString.length % 2 !== 0) {
+    throw new Error('Hex string must have an even number of characters');
+  }
+
+  const buffer = new ArrayBuffer(hexString.length / 2);
+  const uint8Array = new Uint8Array(buffer);
+  for (let i = 0; i < hexString.length; i += 2) {
+    uint8Array[i / 2] = parseInt(hexString.substring(i, i + 2), 16);
+  }
+
+  return buffer;
+}