Add Slack webhook when Recognition is created

[mcritchlow]

Descriptive summary

Internal Communications would like to have High Five recognitions posted to the #general channel in Slack. Create a webhook which is triggered when a Recognition is successfully created.

Desired look from Kacy (thanks to @jessicahilt):

Questions to address:

• should this happen for anonymous submissions?
• since we do not have a direct mapping of high five UID and Slack UID, do we use plain text names?
• other?

Rationale

More High Five! visibility :hand:

[mcritchlow]

This is fairly do-able(see sample script below):

I think formatting is going to be the only real pain here.

require 'net/http'
require 'uri'
require 'json'

def notify_slack(webhook_url, text)
  payload = {
    :text     => text,
  }.to_json
  uri = URI.parse(webhook_url)
  header = {'Content-Type': 'application/json'}

  # Create the HTTP objects
  https = Net::HTTP.new(uri.host, uri.port)
  https.use_ssl = true
  request = Net::HTTP::Post.new(uri.request_uri, header)
  request.body = payload

  # Send the request
  response = https.request(request)
end

# takes emojis, links, etc.
notify_slack('<hook-url>', 'Hello, from Ruby :smile: <https://"prod server"/recognitions/1234|A link to a Recognition>')