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NotificationWebsite

This project was developed as a test assignment as part of the selection for an internship

Implement a web application on ASP .NET Core that allows creating users in the application with subsequent automatic sending of emails to users on a schedule.

MainPage

The application must read parameters from the json file of the application settings.

The parameters must specify:

  • Task execution schedule as a cron expression
  • Path to the folder with email templates

The application must contain a background service that will perform the following procedure with a specified schedule:

  • Get a list of emails of application users
  • Send an email to all users using a specified template

Within the application, it is also necessary to implement a REST API for saving users with the following endpoint: POST /api/users - creating a new user

The request body must contain email, name and age.

InputValidation

Email validation:

  • Compliance with email format
  • Uniqueness within the application

Name validation:

  • Name length must not exceed 20 characters
  • Cannot be null

Age validation:

  • Age must be between 18 and 100 years old

The application must send a welcome email upon registration.

SuccessSubscription

The application must support at least 2 email templates:

  • Welcome email
  • Informational email

Ability to insert variables into the template (username, email, etc.) The User model must contain the following fields:

  • Id – unique user identifier
  • Email – email
  • Name – username
  • Age – age
  • Timestamp – Creation date (in UTC format)

Storage all users in the InMemory Database.

Requirements:

  • .NET 8 platform
  • Application type - web application with REST API
  • Support for Windows and Linux-style paths
  • The application must have at least 2 email templates
  • User creation must be validated
  • The application must correctly handle errors that occur during operation, displaying understandable messages to the user. If an error occurs while sending a message to the mail, the program must process and display the error, and then wait for the next attempt according to the schedule

ErrorSubscription

ErrorWelcomeSending

Additional conditions of the task:

  • Implement logging in the application using the standard ILogger mechanism:
  • Error logging
  • Request logging
  • Logging the progress of sending mail
  • Logging the process of creating a user

ErrorSubscription

Implement receiving a list of users, as well as sending a POST request to send a letter along the path:

  • POST /api/users/{id}/email
  • When sending a letter via a request, it is sent to the user's mail instantly, without waiting

InstantNotificationSending

InstantNotificationEmail

ErrorInstantSending

Examples of letters:

The content of the letter when creating a new user in the system:

  • Welcome to our system {{Name}}
  • Your email {{Email}}
  • Random image from the Internet (you can use https://http.cat/{status_code}, with any existing status code)

WelcomeEmail

Contents of the information letter:

  • We inform you {{Name}}
  • Time passed since the user was created: {{ Time }}
  • Random image from the Internet (you can use https://http.dog/{status_code}.jpg, with any existing status code) Where Time is the calculated time unit of the difference, the current DateTime and Timestamp in utc

NotificationEmail