SSL/TLS Monitoring API

openapi: 3.1.0
info:
  title: SSL/TLS Certificate Management Certificates Monitoring API
  description: A REST API for SSL/TLS certificate lifecycle management including issuance, renewal, revocation, and monitoring. Represents common certificate management capabilities available across major CAs and PKI platforms including Let's Encrypt ACME, DigiCert, Sectigo, and enterprise PKI systems.
  version: '1.0'
  contact:
    name: Let's Encrypt
    url: https://letsencrypt.org/
  license:
    name: Mozilla Public License 2.0
    url: https://mozilla.org/MPL/2.0/
servers:
- url: https://api.certmanager.example.com/v1
  description: Certificate Management API
security:
- ApiKeyAuth: []
tags:
- name: Monitoring
  description: Certificate expiry monitoring
paths:
  /monitoring/expiring:
    get:
      operationId: getExpiringCertificates
      summary: Get Expiring Certificates
      description: Returns certificates expiring within the specified number of days. Use this for automated renewal workflows and alerting.
      tags:
      - Monitoring
      parameters:
      - name: days
        in: query
        description: Number of days to look ahead for expiring certificates
        schema:
          type: integer
          default: 30
          minimum: 1
          maximum: 90
      responses:
        '200':
          description: Expiring certificates
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/CertificateListResponse'
components:
  schemas:
    Certificate:
      type: object
      properties:
        id:
          type: string
          description: Unique certificate identifier
        commonName:
          type: string
          description: Certificate common name (primary domain)
        subjectAlternativeNames:
          type: array
          items:
            type: string
          description: All SANs in the certificate
        serialNumber:
          type: string
          description: Certificate serial number (hex)
        issuer:
          type: string
          description: Certificate issuer distinguished name
        subject:
          type: string
          description: Certificate subject distinguished name
        notBefore:
          type: string
          format: date-time
          description: Certificate validity start
        notAfter:
          type: string
          format: date-time
          description: Certificate expiry
        status:
          type: string
          enum:
          - issued
          - pending
          - revoked
          - expired
        certType:
          type: string
          enum:
          - DV
          - OV
          - EV
          - wildcard
          - multi-domain
          - private
        pem:
          type: string
          description: PEM-encoded certificate
        chain:
          type: string
          description: PEM-encoded intermediate chain
        keyAlgorithm:
          type: string
          enum:
          - RSA-2048
          - RSA-4096
          - EC-256
          - EC-384
        fingerprint:
          type: object
          properties:
            sha256:
              type: string
            sha1:
              type: string
        createdAt:
          type: string
          format: date-time
        revokedAt:
          type: string
          format: date-time
          nullable: true
        revocationReason:
          type: string
          nullable: true
    CertificateListResponse:
      type: object
      properties:
        certificates:
          type: array
          items:
            $ref: '#/components/schemas/Certificate'
        total:
          type: integer
        page:
          type: integer
  securitySchemes:
    ApiKeyAuth:
      type: apiKey
      in: header
      name: X-API-Key