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# A simple webhook server for smartswitch devices
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This is a tiny webserver designed to receive webhooks that control
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microcontrollers running [smartswitch](https://git.annabunch.es/annabunches/smartswitch/).
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## Configuration
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The server can be configured via the following environment variables:
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* DEBUG - if set, extra output will be logged / generated. **this will leak secrets to stdout**
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* LISTEN_PORT - the TCP port to serve the app on. Default is `7200`.
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* WEBHOOK_CONFIG_FILE - location of the webhook config. Defaults to `./webhooks.yaml`.
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The webhooks configuration file should be an array of entries with the following keys:
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* name - A human-readable name that explains the webhook's purpose.
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* path - The webhook will be served by the app at this path.
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* secret_key - An authentication value for reading and writing to the webhook. This must be included in all requests. (see Usage for format)
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* num_switches - the number of data points / indexes expected with each POST.
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* momentary_switches - an array of any indexes that refer to 'momentary' switches.
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The value of these indexes will be reset to 0 after the next GET request to the webhook.
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## Build & Run
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Build the server with:
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```
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make build
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```
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And run with:
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```
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./smartswitch-server
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```
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A dockerfile is also included, along with a sample docker-compose.yml demonstrating
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how the server might be run in a containerized environment.
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Note that you SHOULD always run this service behind a TLS-encrypted proxy. Using plain http WILL expose your secret keys.
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## Usage
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To read the current webhook data, simply send a GET to the webhook URL, with the `key` parameter appropriately set. Example:
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```
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curl -x GET "https://example.com/WEBHOOK_PATH?key=WEBHOOK_KEY
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```
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To write data, send a POST to the same URL, with a json-formatted body in the following format:
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```
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[value0, value1, value2, ...]
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```
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