SSL validation (#45)

* Split up events and their related methods

* Add a simple SSL validator

* Rename Event to MonitorEvent

* Initial SSL checker logic

* Fix issues after rebase

* Fix style issues

* Add missing assertion for HandlersInfoSource test

* Switch off communication logger in the test env

* Fix test scope descriptions in UptimeCheckerTest

* Add SSL_EVENT table to DatabaseCleaner

* Integrate SSL checks into MonitorController

* Fix error message string in SSLValidator

* Integrate SSL checks into scheduler and basic handlers

* Update API docs

* Use dedicated emoji for SSLValidEvent

* Improve existing tests

* Integrate SSL checks into SlackEventHandler

* Integrate SSL checks into TelegramEventHandler

* Extract formatting from TextMessageEventHandler

* Extract formatting from TextMessageEventHandler #2

* Restructure the whole text formatting logic

* Integrate SSL checks into SMTPEventHandler

* Update README

* Expose SSL related info on MonitorDetailsDto

* Add missing tests: UptimeEventRepository

* Add missing tests for formatters

* Update README

README.md

@@ -22,14 +22,14 @@ Kuvasz (pronounce as [ˈkuvɒs]) is an ancient hungarian breed of livestock & gu
 ### Features
 
 - Uptime & latency monitoring with a configurable interval
+- SSL certification monitoring (once a day)
 - Email notifications through SMTP
 - Slack notifications through webhoooks
 - Telegram notifications through the Bot API
 - Configurable data retention period
 
 ### Under development 🚧
 
-- SSL certification monitoring
 - Regular Lighthouse audits for your websites
 - Pagerduty, Opsgenie integration
 - Kuvasz Dashboard, a standalone GUI

docs/api-doc/kuvasz-latest.yml

@@ -275,6 +275,8 @@ components:
           format: int32
         enabled:
           type: boolean
+        sslCheckEnabled:
+          type: boolean
         createdAt:
           type: string
           format: date-time
@@ -292,9 +294,22 @@ components:
           type: string
           format: date-time
           nullable: true
+        sslStatus:
+          $ref: '#/components/schemas/SslStatus'
+        sslStatusStartedAt:
+          type: string
+          format: date-time
+          nullable: true
+        lastSSLCheck:
+          type: string
+          format: date-time
+          nullable: true
         uptimeError:
           type: string
           nullable: true
+        sslError:
+          type: string
+          nullable: true
         averageLatencyInMs:
           type: integer
           format: int32
@@ -312,6 +327,12 @@ components:
       enum:
       - UP
       - DOWN
+    SslStatus:
+      type: string
+      enum:
+      - VALID
+      - INVALID
+      - WILL_EXPIRE
     ServiceError:
       type: object
       properties:
@@ -344,6 +365,8 @@ components:
         updatedAt:
           type: string
           format: date-time
+        sslCheckEnabled:
+          type: boolean
     MonitorCreateDto:
       required:
       - name
@@ -364,6 +387,9 @@ components:
         enabled:
           type: boolean
           nullable: true
+        sslCheckEnabled:
+          type: boolean
+          nullable: true
     MonitorUpdateDto:
       type: object
       properties:
@@ -382,6 +408,9 @@ components:
         enabled:
           type: boolean
           nullable: true
+        sslCheckEnabled:
+          type: boolean
+          nullable: true
   securitySchemes:
     bearerAuth:
       type: http