Contact Service

Contact-service has been created as a backend for a contact form on a website. Messages are sent through mail.

API

This service is exposing one REST endpoint:

POST /v1/message

{
  "subject": "this field will be used as a subject of a message",
  "content": "this will be body of the message"
}

• Request:

  • Type: JSON

  • Fields:

    • "subject" - required field representing message subject
    • "content" - message field used in default message template (please take a look on Templates section for more information)

• Success response:

  • Code: 200
  • Content: empty

• Error response:

  • Code: 429
  • Content: empty

Docker image

This service is exposed as a klyman/contact-service image on Docker HUB.

Configuration

Container is configured by environment variables.

Mail configuration

• MAIL_SERVER_DOMAIN - should be set to mail server domain address
• MAIL_SERVER_PORT - (by default 587) should be set to mail server port
• MAIL_SERVER_USERNAME - username for mail server
• MAIL_SERVER_PASSWORD - password for mail server
• MAIL_SERVER_USERNAME_FILE - path to file containing mail username. This will be used only when MAIL_SERVER_USERNAME is empty
• MAIL_SERVER_PASSWORD_FILE - path to file containing mail password. This will be used only when MAIL_SERVER_PASSWORD is empty
• MAIL_RECIPIENT_MAIL - mail address to which messages will be sent
• MAIL_SENDER_MAIL - mail address which will be set as sender

Throttling configuration

• THROTTLING_IP_LIMIT - (by default 5) message limit per IP configured with THROTTLING_IP_WINDOW
• THROTTLING_IP_WINDOW - (by default 24h) time window in which ip limit will be applied provided as value and time unit (e.g. 4h)
• THROTTLING_ALL_LIMIT - (by default 15) global message limit configured with THROTTLING_ALL_WINDOW
• THROTTLING_ALL_WINDOW - (by default 24h) time window in which global limit will be applied provided as value and time unit (e.g. 4h)
• THROTTLING_CLEAR_EXPIRED_RATE - (by default 24h) expired windows clearing rate

Example docker-compose

version: '3.1'

services:
  contact-service:
    image: klyman/contact-service:latest
    environment:
      - MAIL_RECIPIENT_MAIL=recipient@mailserver.com
      - MAIL_SENDER_MAIL=sender@mailserver.com
      - MAIL_SERVER_DOMAIN=mailserver.com
      - MAIL_SERVER_USERNAME_FILE=/run/secrets/username
      - MAIL_SERVER_PASSWORD_FILE=/run/secrets/password
    volumes:
      - ./config:/run/secrets
      - ./config/template.mustache:/app/message.mustache
    ports:
      - "80:80"

Templates

Messages can be personalized by using Mustache templates. Default template uses only content field:

{{content}}

It is possible to inject custom message template by creating volume on /app/message.mustache (please take a look on example in Example docker-compose section).

Example

For following template:

Phone Number: {{phone}}
Message: {{message}}

User should send request:

POST /v1/message

{
  "subject": "mysubject",
  "phone": "123 456 789",
  "message": "message"
}

It is also possible to include subject field in template:

Subject: {{subject}}
Phone Number: {{phone}}
Message: {{message}}