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README.md
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README.md
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[Telegraf](https://github.com/telegraf/telegraf) module for [NestJS](https://github.com/nestjs/nest).
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## Documentation
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If you want to dive fully into NestJS Telegraf then don't waste your time in this dump, check out the [documentation site](https://nestjs-telegraf.vercel.com).
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## Installation
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```bash
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$ npm i nestjs-telegraf
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```
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Once the installation process is complete, we can import the TelegrafModule into the root AppModule.
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Once the installation process is complete, we can import the `TelegrafModule` into the root `AppModule`:
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```typescript
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/* app.module.ts */
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import { Module } from '@nestjs/common';
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import { TelegrafModule } from 'nestjs-telegraf';
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@ -35,16 +36,9 @@ import { TelegrafModule } from 'nestjs-telegraf';
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export class AppModule {}
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```
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The `forRoot()` method accepts the same configuration object as Telegraf class constructor from the Telegraf package, as described [here](https://telegraf.js.org/#/?id=constructor).
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## Telegraf methods
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Each Telegraf instance method described [here](https://telegraf.js.org/#/?id=telegraf) has own decorator in `nestjs-telegraf` package. The name of the decorator corresponds to the name of the Telegraf method. For example [`@Hears`](https://telegraf.js.org/#/?id=hears), [`@On`](https://telegraf.js.org/#/?id=on), [`@Action`](https://telegraf.js.org/#/?id=action) and so on.
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Now let's try to repeat the example from the Telegraf [documentation page](https://telegraf.js.org/#/?id=example).
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Then add some decorators into the `app.service.ts` for handling Telegram bot API updates:
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```typescript
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/* app.service.ts */
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import { Injectable } from '@nestjs/common';
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import {
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Start,
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@ -78,105 +72,6 @@ export class AppService {
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}
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```
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## Bot injection
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At times you may need to access the native `Telegraf` instance. For example, you may want to connect stage middleware. You can inject the Telegraf by using the `@InjectBot()` decorator as follows:
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```typescript
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import { Injectable } from '@nestjs/common';
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import { InjectBot, TelegrafProvider } from 'nestjs-telegraf';
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@Injectable()
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export class BotSettingsService {
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constructor(@InjectBot() private bot: TelegrafProvider) {}
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}
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```
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## Async configuration
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When you need to pass module options asynchronously instead of statically, use the forRootAsync() method. As with most dynamic modules, Nest provides several techniques to deal with async configuration.
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One technique is to use a factory function:
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```typescript
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TelegrafModule.forRootAsync({
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useFactory: () => ({
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token: 'TELEGRAM_BOT_TOKEN',
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}),
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});
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```
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Like other [factory providers](https://docs.nestjs.com/fundamentals/custom-providers#factory-providers-usefactory), our factory function can be async and can inject dependencies through inject.
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```typescript
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TelegrafModule.forRootAsync({
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imports: [ConfigModule.forFeature(telegrafModuleConfig)],
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useFactory: async (configService: ConfigService) => ({
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token: configService.get<string>('TELEGRAM_BOT_TOKEN'),
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}),
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inject: [ConfigService],
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});
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```
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Alternatively, you can configure the TelegrafModule using a class instead of a factory, as shown below:
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```typescript
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TelegrafModule.forRootAsync({
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useClass: TelegrafConfigService,
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});
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```
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The construction above instantiates `TelegrafConfigService` inside `TelegrafModule`, using it to create the required options object. Note that in this example, the `TelegrafConfigService` has to implement the `TelegrafOptionsFactory` interface, as shown below. The `TelegrafModule` will call the `createTelegrafOptions()` method on the instantiated object of the supplied class.
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```typescript
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@Injectable()
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class TelegrafConfigService implements TelegrafOptionsFactory {
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createTelegrafOptions(): TelegrafModuleOptions {
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return {
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token: 'TELEGRAM_BOT_TOKEN',
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};
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}
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}
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```
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If you want to reuse an existing options provider instead of creating a private copy inside the `TelegrafModule`, use the `useExisting` syntax.
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```typescript
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TelegrafModule.forRootAsync({
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imports: [ConfigModule.forFeature(telegrafModuleConfig)],
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useExisting: ConfigService,
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});
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```
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## Webhooks
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If you want to configure a telegram bot webhook, you need to get a middleware from `TelegrafProvider` for connect it in your `main.ts` file.
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To access it, you must use the `app.get()` method, followed by the provider reference:
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```typescript
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const telegrafProvider = app.get('TelegrafProvider');
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```
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Now you can connect middleware:
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```typescript
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app.use(telegrafProvider.webhookCallback('/secret-path'));
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```
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The last step is to specify launchOptions in `forRoot` method:
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```typescript
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TelegrafModule.forRootAsync({
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imports: [ConfigModule.forFeature(telegrafModuleConfig)],
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useFactory: async (configService: ConfigService) => ({
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token: configService.get<string>('TELEGRAM_BOT_TOKEN'),
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launchOptions: {
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webhook: {
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domain: 'domain.tld',
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hookPath: '/secret-path',
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}
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}
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}),
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inject: [ConfigService],
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});
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```
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## Support
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Nest is an MIT-licensed open source project. It can grow thanks to the sponsors and support by the amazing backers. If you'd like to join them, please [read more here](https://docs.nestjs.com/support).
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module.exports = {
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title: 'NestJS Telegraf',
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tagline: 'Powerful Nest module for easy and fast creation Telegram bots',
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url: 'https://your-docusaurus-test-site.com',
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url: 'https://nestjs-telegraf.vercel.com',
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baseUrl: '/',
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onBrokenLinks: 'throw',
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favicon: 'img/favicon.ico',
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