AWS における SSL/TLS 証明書の有効期限切れレポートの自動化

• •Slack Bot Token または Webhook URL
• •Google Drive API認証情報
• •ターゲットAPIの認証情報が必要な場合あり
• •AWS Access Key と Secret
• •OpenAI API Key

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        "content": "# Automated SSL/TLS Certificate Expiry Report for AWS\n![](https://wisestackai.s3.ap-southeast-1.amazonaws.com/Blue+and+Yellow+Gradient+Meditation+Youtube+Thumbnail.jpg)\n> Automatically generates a weekly report of all AWS ACM certificates, including status, expiry dates, and renewal eligibility. The workflow formats the data into both Markdown (for PDF export to Slack) and HTML (for email summary), helping teams stay on top of certificate compliance and expiration risks.\n\n## **Who’s it for**\nThis workflow is designed for **DevOps engineers**, **cloud administrators**, and **compliance teams** who manage AWS infrastructure and need **automated weekly visibility** into the status of their SSL/TLS certificates in **AWS Certificate Manager (ACM)**. It's ideal for teams that want to reduce the risk of expired certs, track renewal eligibility, and maintain reporting for audit or operational purposes.\n\n## **How it works / What it does**\nThis n8n workflow performs the following actions on a weekly schedule:\n\n1. **Trigger**: Automatically runs once a week using the `Weekly schedule trigger`.\n2. **Fetch Certificates**: Uses `Get many certificates` action from AWS Certificate Manager to retrieve all certificate records.\n3. **Parse Data**: Processes and reformats certificate data (dates, booleans, SANs, etc.) into a clean JSON object.\n4. **Generate Reports**:\n   - 📄 **Markdown Report**: Uses the `Certificate Summary Markdown Agent` (OpenAI) to generate a Markdown report for PDF export.\n   - 🌐 **HTML Report**: Uses the `Certificate Summary HTML Agent` to generate a styled HTML report for email.\n5. **Deliver Reports**:\n   - Converts Markdown to PDF and sends it to Slack as a file.\n   - Sends HTML content as a formatted email.\n\n## **How to set up**\n\n1. **Configure AWS Credentials** in n8n to allow access to AWS ACM.\n2. Create a new workflow and use the following nodes in sequence:\n   - `Schedule Trigger`: Weekly (e.g., every Monday at 08:00 UTC)\n   - `AWS ACM → Get many certificates`\n   - `Function Node → Parse ACM Data`: Converts and summarizes certificate metadata\n   - `OpenAI Chat Node (Markdown Agent)` with a system/user prompt to generate Markdown\n   - `Configure Metadata` → Define file name and MIME type (`.md`)\n   - `Create document file` → Converts Markdown to document stream\n   - `Convert to PDF`\n   - `Slack Node` → Upload the PDF to a channel\n   - *(Optional)* Add a second `OpenAI Chat Node` for generating HTML and sending it via email\n\n3. **Connect Output**:\n   - Markdown report → Slack file upload\n   - HTML report → Email node with embedded HTML\n\n## **Requirements**\n\n- 🟩 **n8n instance** (self-hosted or cloud)\n- 🟦 **AWS account** with access to ACM\n- 🟨 **OpenAI API key** (for ChatGPT Agent)\n- 🟥 **Slack webhook or OAuth credentials** (for file upload)\n- 📧 **Email integration** (e.g., SMTP or SendGrid)\n- 📝 Permissions to write documents (Google Drive / file node)\n\n## **How to customize the workflow**\n\n- **Change report frequency**: Adjust the `Weekly schedule trigger` to daily or monthly as needed.\n- **Filter certificates**:\n  - Modify the function node to only include `EXPIRED`, `IN_USE`, or `INELIGIBLE` certs.\n  - Add tags or domains to include/exclude.\n- **Add visuals**: Enhance the HTML version with colored rows, icons, or company branding.\n- **Change delivery channels**:\n  - Replace Slack with Microsoft Teams, Discord, or Telegram.\n  - Send Markdown as email attachment instead of PDF.\n- **Integrate ticketing**:\n  - Create a JIRA/GitHub issue for each certificate that is `EXPIRED` or `INELIGIBLE`."
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        "content": "### 1. ⏰ Weekly Schedule Trigger\nThe workflow is automatically triggered every week using a scheduled event (e.g., every Monday at 08:00 UTC) to ensure regular monitoring of ACM certificates without manual intervention."
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        "content": "### 2. 📥 Retrieve ACM Certificates\nUses the `Get many certificates` action from AWS Certificate Manager to fetch all issued, expired, or in-use SSL/TLS certificates from your AWS account."
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        "content": "### 3. 🧮 Parse and Format Certificate Data\nA function node processes the raw certificate data, converting UNIX timestamps to readable dates, flattening arrays, and calculating useful stats like total, expired, and in-use certificates."
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        "content": "### 4. 📝 Generate Markdown Report\nThe `Certificate Summary Markdown Agent` (powered by OpenAI) takes the structured JSON data and converts it into a clean, professional Markdown report, ready for export.\n"
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        "content": "### 7. 📧 Send Weekly Email Summary\nThe HTML report is sent via email to IT, DevOps, or compliance teams, providing a clear and accessible summary of certificate health directly in their inbox.\n"
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        "content": "### 6. 💬 Send PDF Report to Slack\nThe finalized PDF report is uploaded to a specific Slack channel (e.g., `#it-security` or `#cloud-ops`) so stakeholders are instantly notified of certificate status.\n"
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