Jul 14, 2019

camping with computers

I hacked together a script that checks for open camping reservations at state campgrounds in California. These sites are limited and demand is high. Last year [the state parks reservation service underwent a reboot] ( in an effort to discourage this kind of thing.

It worked! The re-captcha was too much for me to try to hack against in a weekend, so I left it to just scan for open dates and send a slack notification to me.


here’s the repo

The request data looks like this:

req_params_template = {
    "RegionId": 0,
    "PlaceId": 680,
    "FacilityId": 0,
    "StartDate": "12/29/2019",
    "Nights": "1",
    "CategoryId": "0",
    "UnitTypeIds": [],
    "UnitTypesCategory": [],
    "ShowOnlyAdaUnits": False,
    "ShowOnlyTentSiteUnits": False,
    "ShowOnlyRvSiteUnits": False,
    "MinimumVehicleLength": "0",
    "FacilityTypes_new": 0,
    "AccessTypes": [],
    "ShowIsPremiumUnits": False,
    "ParkFinder": [],
    "UnitTypeCategoryId": "0",
    "ShowSiteUnitsName": "0",
    "AmenitySearchParameters": []

Given a list of dates to search–say all the Fridays in August–and a list of campsite ids, the script requests each combination of site and date and sends off a message over slack webhook.

The campsite ids you have know, and I haven’t added a way of fetching those. For now you just gotta look up the desired site and find it’s id by peering into the browser dev tools network tab or something. I don’t remember.

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