DialogFlow module for NestJS :satellite:

Dialog flow module that simplify the web hook handling for your NLP application using NestJS

Getting Started

To start using this module you should run the following command

npm i nestjs-dialogflow @nestjs/common @nestjs/core reflect-metadata

Features

There are 3 decorators provided by the module that allow you to handle intent/action or pick properties from the response.

| Name | behavior | |:-----|:--------:| |@DialogFlowIntent('myIntent') public method(param: DialogFlowResponse)| Handle the specified intent into the decorated method | |@DialogFlowAction('myAction') public method(param: DialogFlowResponse)| Handle the specified action into the decorated method | |@DialogFlowIntent('myIntent') public method(@DialogFlowParam('queryResult') param: QueryResult)| Get the value of the property specified through the parameter decorator |

Set up

To use the module, you have to import it into your ApplicationModule and call the forRoot in order to initialize the module. The forRoot method can take as parameters an object with a basePath and a postPath in order to configure the controller used for the web hook.

@Module({
    imports: [
        DialogFlowModule.forRoot({
            basePath: 'web-hooks',
            postPath: 'dialog-flow'
        })
    ]
})
export class ApplicationModule { }

After that, you have to go to your dialogFlow account to set up the url that should be reach to provide the result of your NLP request into the Fulfillment section of your agent. The url with the default config should looks like https://myurl.me/web-hooks/dialog-flow

To handle an intent, you have to create your own Injectable that will implement all the methods needed in order to handle the concerned intents/action.

@Injectable()
export class MyDialogFlowProvider {
    
    @DialogFlowIntent('My:intent1')
    public async handleMyIntent1(dialogFlowResponse: DialogFlowResponse): Promise<DialogFlowFulfillmentResponse> {
        /* Your code here */
        return {} as DialogFlowFulfillmentResponse;
    }

    @DialogFlowIntent('My:intent2')
    public async handleMyIntent2(dialogFlowResponse: DialogFlowResponse): Promise<DialogFlowFulfillmentResponse> {
        /* Your code here */
        return {} as DialogFlowFulfillmentResponse;
    }
    
}

You also have the possibility to pick any properties that you need directly from the dialogFlowResponse, to get them from the handler parameters. To do that, you can use the @DialogFlowParam decorator and pass as parameter a string path to the property that you want to pick.

@Injectable()
export class MyDialogFlowProvider {
    
    @DialogFlowIntent('My:intent1')
    public async handleMyIntent1(@DialogFlowParam('queryResult.outputContexts') outputContexts: OutputContexts): Promise<DialogFlowFulfillmentResponse> {
        /* Your code here */
        return {} as DialogFlowFulfillmentResponse;
    }

    @DialogFlowIntent('My:intent2')
    public async handleMyIntent2(@DialogFlowParam('queryResult') queryResult: QueryResult): Promise<DialogFlowFulfillmentResponse> {
        /* Your code here */
        return {} as DialogFlowFulfillmentResponse;
    }
    
}

Inside the DialogFlowModule a middleware is apply in order to validate the token sent by dialogFlow, so when your start your server, you will have to set the DIALOG_FLOW_AUTHORIZATION_TOKEN env variable.

That's it, you can run your application and test it !! :)

Built With

• NestJS A progressive Node.js framework for building efficient and scalable server-side applications on top of TypeScript & JavaScript (ES6 / ES7 / ES8) heavily inspired by Angular

Versioning

We use SemVer for versioning. For the versions available, see the tags on this repository.

Authors

• Adrien de Peretti

License

This project is licensed under the MIT License - see the LICENSE.md file for details