#!/usr/bin/env ruby
#
# Triggers:
#     sendrequest change-commit ... "/path/to/file/sendrequest.rb
#        %serverport% %change%   %triggerMeta_trigger%"
#
#     sendrequest shelve-commit ... "/path/to/file/sendrequest.rb
#        %serverport% %change%   %triggerMeta_trigger%"
#
#     sendrequest form-commit   ... "/path/to/file/sendrequest.rb
#        %serverport% %formfile% %triggerMeta_trigger%"
#
# Description:
#   Sends a POST request to the URLs specified in the Perforce server key
#   which corresponds to the trigger type that this script is invoked with.
#   
#   If this script is invoked as a change-commit trigger:
#     Looks for a JSON array of valid URLs in the 'webhook-change-commit' key.
#     Sends a JSON string containing the user who submitted the changelist,
#     the changelist description, and an array of the filenames of the files
#     that were changed.
#
#   If this script is invoked as a shelve-commit trigger:
#     Looks for URLs in the 'webhook-shelve-commit' key.
#     Sends information is same format as change-commit trigger.
#
#   If this script is invoked as a form-commit trigger:
#     Looks for a JSON array of valid URLs in the 'webhook-form-commit' key.
#     Sends a JSON string containing the contents of the form.

# SET THESE OR TRIGGER WILL NOT WORK
p4bin  = '/usr/local/bin/p4'
user   = 'example'
passwd = 'example'
# ALL SET

require 'net/http'
require 'json'

begin
  if ARGV.length != 3
    print 'Usage: sendrequest.rb '
    puts  '%serverport% (%change% | %formfile%) %triggerMeta_trigger%'
    exit 1
  end

  serverport  = ARGV[0]
  triggertype = ARGV[2]
  p4 = "#{p4bin} -p #{serverport} -u #{user} -P #{passwd}"
  params = nil

  if (triggertype == 'change-commit' || triggertype == 'shelve-commit')
    change = ARGV[1]

    describe_output = `#{p4} -R describe -s #{change}`
    formatted = Marshal.load(describe_output)

    change_user = formatted['user']
    change_desc = formatted['desc']

    files = []
    i = 0
    loop do
      filename = formatted["depotFile#{i}"]

      break if (nil == filename)

      files << filename
      i += 1
    end

    params = {'content' => "{ 'user'        => #{change_user},
                              'description' => #{change_desc},
                              'files'       => #{files} }" }

  elsif (triggertype == 'form-commit')
    formfile = ARGV[1]
    form = File.read(formfile)
    params = {'content' => form}
  else
    puts "Trigger must be change-commit, shelve-commit or form-commit."
    exit 1
  end

  begin
    urls = JSON.parse(`#{p4} key webhook-#{triggertype}`)

    json_headers = {"Content-Type" => "application/json",
      "Accept" => "application/json"}

    urls.each do |url|
      uri = URI.parse(url)
      http = Net::HTTP.new(uri.host, uri.port)
      begin
        response = http.post(uri.path, params.to_json, json_headers)
        #puts response
      rescue ArgumentError
      end
    end

  rescue JSON::ParserError
  end
end

exit 0