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Everbridge emergency service

When a person visits the campus website, and there is an active emergency, they should be notified immediately. This service exposes active emergencies as a simple JSON CORS API.

Authentication

Updating messages requires sending a unique key to the update endpoint. Before running this service, make sure to set the environment variable EMERGENCY_UPDATE_TOKEN with a random string.

Setting up Everbridge

This service needs to be set up as a "Web Publishing" endpoint under the Settings area of an organization in Everbridge. Add a new web publisher with the URL:

https://[my domain]/update?key=[value of EMERGENCY_UPDATE_TOKEN]

Sending all clear

To stop sending emergency messages, send an Everbridge message with "all clear" in the title.

Response

The response includes a boolean status value, where true means an emergency is active.

When there is no emergency:

{
  "status": false
}

When there is an emergency:

{
  "status": true,
  "title": "Viking attack!",
  "body": "Head for the hills!"
}

Caching

Some browsers ignore Cache-control sometimes. To prevent this, always make the XHR with a extra search query of the current timestamp.