find_connections.rb

$LOAD_PATH.unshift(File.realpath(File.dirname(__FILE__)))
require "multicraft_api"

api = MulticraftApi.new('address','user','key')
api.findConnections :id, 1

multicraft_api.rb

require 'json'
require 'net/http'
require 'uri'
require 'digest/md5'
class MulticraftApi
  attr_accessor :last_response
  @@methods = {
      :listUsers => [],
      :listConnections => [],
      :findConnections => [{:name => :field, :type => :array}, {:name => :value, :type => :array}],
  }
  def initialize(url, user, key)
    @url = url
    @user = user
    @key = key
  end

  def method_missing(method, *arguments)
    if (!@@methods.has_key? method)
      return {:success => false, :errors => ["Unknown API method \"#{method.to_s}\""], :data => {}}
    end
    callargs = {}
    argnames = @@methods[method]
    argnames.each_index do |item, index|
      if item.kind_of?(Hash)
        name = item[:name]
      else
        name = item.to_s
      end
      if index < arguments.count
        value = arguments[index]
      elsif item.kind_of?(Hash) && item.has_key?(:default)
        if index >= arguments.count
          value = arg[:default]
        else
          value = arguments[index]
        end
      else
        return {:success => false, :errors => ["\"#{method.to_s}()\": Not enough arguments (#{arguments.count})"], :data => {}}
      end
      if item.kind_of?(Hash) && item.has_key?(:type)
        if arg[:type] == :array
          value = JSON.generate(value)
        end
        callargs[name] = value;
      end
      call(method.to_s, callargs)
    end
  end

  def call(method, params = {})
    if @url.empty?
      return {:success => false, :errors => ['Invalid target URL']}
    end
    if @key.empty?
      return {:success => false, :errors => ['Invalid API key']}
    end
    if !params.kind_of?(Hash)
      params = {params => params}
    end
    params[:'_MulticraftAPIMethod'] = method;
    params[:'_MulticraftAPIUser'] = @user;
    str = ''
    params.each_value { |param|
      str << param
    }
    params[:'_MulticraftAPIKey'] = Digest::MD5.digest(@key+str)
    send_request(@url, params)
  end

  def send_request(url, query)
    uri = URI.parse(url)
    response = Net::HTTP.post_form(uri, query)
    if (!response.kind_of?(Net::HTTPSuccess))
      error = 'Empty response (wrong API URL or connection problem)'
      return {:success => false, :errors => [error], :data => ''}
    end
    @last_response = response
    ret = JSON.parse(response.body, :symbolize_names => true)
    if !ret.kind_of?(Hash)
      return {:success => false, :errors => [ret], :data => {}}
    end
    ret
  end
end