saimarpaka / TaxServiceCalculationApp

TaxServiceCalculationApp

Class diagram of the project

Documentation : Goal: - To be able to use Different implementations of ITaxCalculator, depending on the customer

• Requirements

  • Create a common interface "ITaxCalculator" , which provides the following 2 methods

    1. GetTaxRatesForLocation
    2. GetCalculatedTaxesForOrder

  • Create the TaxCalculatorService and implement ITaxCalculator interface

  • Create the LoggingTaxCalculatorClient and implement ITaxCalculator interface

    • This class is responsible for logging the requests, and responses of ITaxCalculator injected clients

  • Create the TaxJarCalculatorClient with the following requirements

    • Implement ITaxCalculator interface
    • Inject TaxJarRequestBuilder
      • The responsibility of this class is to handle building of the RestRequests
    • Inject RestClient
    • Handle the response of the requests made by the concrete implementations of ITaxCalculatorInterface

  • Create the TaxJarRequestBuilder for TaxJarCalculatorClient class, whose responsibilities are as follows

    • Create the following requests
      • CreateGetRequest
      • CreatePostRequest
    • Set the url of the requests depending on the EndpointType passed
      • url for TaxRates for a location : https://api.taxjar.com/v2/rates/:zip (GET)
      • url for Calculated Taxes for order : https://api.taxjar.com/v2/taxes (POST)

  • Create the RequestBuilder for TaxJarRequestBuilder class, whose responsibilites are as follows

    • CreateGetRestRequest
    • CreatePostRestRequest
    • Add authentication headers to the created requests using the IAuthenticationProvider

  • Create TaxJarAuthenticationProvider by implementing the IAuthenticationProvider interface

    • Inject the apiToken to this class, by construction injection, by getting the apiToken from a secure storage like Azure KeyVault(not implemented for this instance)
    • Add the "Authorization" header as "Bearer {apiToken}" for the RestRequest