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🦀 ClawHub

ics to exchange-blocker

by @blucaru

Sync any ICS/iCal calendar to Microsoft Exchange as blocked time slots — supports recurring events, change detection, and privacy-preserving sync

Versionv1.0.0

Downloads556

#clawhub

View on ClawHub →

TERMINAL

clawhub install block-on-exchange

📖 About This Skill

name: calin description: Sync any ICS/iCal calendar to Microsoft Exchange as blocked time slots — supports recurring events, change detection, and privacy-preserving sync version: 1.0.0 metadata: clawdbot: os: ["darwin"] requires: env: - CALINT_ICS_URL - CALINT_MS_CLIENT_ID - CALINT_MS_TENANT_ID bins: - python3 config: - ~/.calintegration/.env primaryEnv: CALINT_ICS_URL files: ["*.py", "install.sh", "requirements.txt"] homepage: https://github.com/Blucaru/CalIn

CalIn — ICS Calendar to Exchange Sync

Sync busy time from any ICS/iCal calendar to Microsoft Exchange as "Blocked" slots. Works with Google Calendar, iCloud, Outlook.com, Nextcloud, Fastmail, Proton Calendar, or any CalDAV server that publishes an ICS feed.

When to Use This Skill

User asks to sync calendars, block time, or mirror busy slots

User wants personal calendar events to block time on their work calendar

User asks to check sync status or clear synced events

Scheduled background sync via Heartbeat (recommended: every 5-30 minutes)

What It Does

Fetches events (including recurring) from any HTTPS ICS feed

Creates/updates/deletes corresponding "Blocked" events on Exchange via Microsoft Graph API

Tracks synced events with a local mapping file — only touches what changed

Privacy-preserving: only syncs time slots, never event titles, descriptions, or attendees

Setup

1. Install dependencies

Requires Python 3.12+.

cd ~/.openclaw/skills/calin
bash install.sh

This creates a Python venv and installs icalendar, msal, recurring-ical-events, and requests.

2. Configure credentials

Add to ~/.calintegration/.env (created by installer with chmod 600):

CALINT_ICS_URL=
CALINT_MS_CLIENT_ID=
CALINT_MS_TENANT_ID=
Optional: sync to a specific Exchange calendar (defaults to primary)
CALINT_MS_CALENDAR_ID=

Where to find your ICS URL:

| Provider | Location | |----------|----------| | Google Calendar | Settings > your calendar > Integrate > "Secret address in iCal format" | | iCloud | Calendar app > right-click calendar > Share > Public Calendar > copy URL | | Outlook.com | Settings > Calendar > Shared calendars > Publish > ICS link | | Nextcloud | Calendar > three-dot menu > Copy subscription link | | Fastmail | Settings > Calendars > Share/export > ICS URL |

Azure AD app (free, no client secret needed): 1. Go to https://portal.azure.com/#view/Microsoft_AAD_RegisteredApps/ApplicationsListBlade 2. New registration > Name: "CalIn" > Redirect URI: Public client > http://localhost:8400 3. API permissions > Add > Microsoft Graph > Delegated > Calendars.ReadWrite 4. Copy Application (client) ID and Directory (tenant) ID

3. Authenticate Microsoft

cd ~/.openclaw/skills/calin
venv/bin/python main.py setup

This opens a browser for one-time Microsoft login. Tokens are cached locally.

Commands

Run these from the skill directory:

| Command | What it does | |---------|-------------| | venv/bin/python main.py sync | Run one sync cycle | | venv/bin/python main.py status | Show last sync time and event count | | venv/bin/python main.py clear | Remove all synced events from Exchange | | venv/bin/python main.py setup | Re-run authentication setup |

Automated Sync (macOS)

The installer generates a launchd plist for automatic sync every 5 minutes:

cd ~/.openclaw/skills/calin
bash install.sh
cp com.calintegration.sync.plist ~/Library/LaunchAgents/
launchctl load ~/Library/LaunchAgents/com.calintegration.sync.plist

How It Works

1. Fetches the ICS feed and expands all recurring events within a 14-day window 2. Compares against the local event map (previous sync state) 3. For each event: - New: Creates a "Blocked" event on Exchange - Changed (time moved): Updates the Exchange event - Deleted from source: Deletes the Exchange event 4. Saves updated event map and last sync timestamp

Change detection uses a hash of start time + end time + all-day flag. Only changed events trigger API calls.

Security and Privacy

Credentials stored in ~/.calintegration/.env with chmod 600 permissions

Tokens stored in ~/.calintegration/ms_token.json with chmod 600 permissions

All files in ~/.calintegration/ directory with chmod 700

No event details synced — only time slots are transmitted. Event titles, descriptions, attendees, and locations are never sent to Exchange

HTTPS only — ICS URLs must use HTTPS; Graph API calls use TLS with certificate verification

No client secret — uses PKCE (Proof Key for Code Exchange) for Microsoft auth

ICS URL validated — rejects non-HTTPS schemes to prevent SSRF

API path IDs validated — prevents injection in Graph API endpoint construction

All HTTP requests have 30-second timeouts to prevent hanging

External endpoints called

| Endpoint | Purpose | Auth | |----------|---------|------| | Your ICS URL (HTTPS) | Read calendar events | URL contains secret token | | login.microsoftonline.com | Microsoft OAuth token exchange | PKCE flow | | graph.microsoft.com/v1.0 | Create/update/delete Exchange events | Bearer token |

Data flow

ICS Feed (read-only) --> [CalIn on your machine] --> Microsoft Graph API (write)
                              |
                     ~/.calintegration/ (local state)

No data is sent to any third party. All processing happens locally.

⚙️ Configuration