Webhooks

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require 'faraday'
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require 'json'
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token       = '<your oauth token>'
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org         = 'https://api.calendly.com/organizations/<org_uuid>'
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user        = 'https://api.calendly.com/users/<user_uuid>'
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webhook_url = '<your webhook endpoint>'
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base_url    = 'https://api.calendly.com'
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conn = Faraday.new(
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  url: base_url,
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  headers: {
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    'Content-Type'  => 'application/json',
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    'Authorization' => "Bearer #{token}"
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  }
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)
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response = conn.post('/webhook_subscriptions') do |req|
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  req.body = {
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    url:          webhook_url,
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    events:       ['invitee.created', 'invitee.canceled'],
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    organization: org,
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    user:         user,
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    scope:        'user'
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  }.to_json
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end

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require 'sinatra'
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EVENT_TYPE_FILTER = 'https://api.calendly.com/event_types/<uuid>'
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post '/webhook' do
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  request.body.rewind
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  payload    = JSON.parse(request.body.read)
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  event_type = payload['scheduled_event']['event_type']
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  if event_type == EVENT_TYPE_FILTER
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    puts '--Received webhook event from Calendly--'
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    pp payload
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  else
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    puts '--Skipping webhook event--'
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  end
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  status :ok
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end