Angular HTTP Interceptor how to chain an observable

Question

I am using the Azure AD adal library to do authentication. There is a call to aquire a token that returns an observable. How can this observable be added into the intercept?

Answer 1

When you need to return something from Observable, you can use map instead of subscribe:

return this.authAzureService.getAccessToken()
  .map(token => request = this.getRequestWithHeaders(request, token));
}