Module: MosEisley

Defined in:
lib/s3po/blockkit.rb,
lib/slack.rb,
lib/logger.rb,
lib/handler.rb,
lib/version.rb,
lib/s3po/s3po.rb,
lib/mos-eisley-lambda.rb

Overview

S3PO - Slack protocol droid in Mos Eisley

::BlockKit - Block Kit tools

Defined Under Namespace

Modules: S3PO, SlackEvent, SlackWeb Classes: Config, Handler

Constant Summary collapse

VERSION = 
'0.7.0'.freeze

Class Method Summary collapse

Class Method Details

.apigw_event(event, context) ⇒ Object 



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# File 'lib/mos-eisley-lambda.rb', line 108

def self.apigw_event(event, context)
  se = MosEisley::SlackEvent.validate(event)
  unless se[:valid?]
    MosEisley.logger.warn("#{se[:msg]}")
    return {statusCode: 401}
  end
  resp = {statusCode: 200}
  ep = event['routeKey'].split[-1]
  MosEisley.logger.debug("Inbound Slack request to: #{ep}")
  case ep
  when '/actions'
    ## Slack Interactivity & Shortcuts
    # Nothing to do, through-pass data
  when '/commands'
    ## Slack Slash Commands
    MosEisley.logger.debug("Slash command event:\n#{se[:event]}")
    r = MosEisley::Handler.run(:command_response, se[:event])
    if String === r
      r = {text: r}
    end
    if Hash === r
      # AWS sets status code and headers by passing JSON string
      resp = JSON.fast_generate(r)
    end
  when '/events'
    ## Slack Event Subscriptions
    # Respond to Slack challenge request
    if se[:event][:type] == 'url_verification'
      c = se[:event][:challenge]
      MosEisley.logger.info("Slack Events API challenge accepted: #{c}")
      return "{\"challenge\": \"#{c}\"}"
    end
  when '/menus'
    # MosEisley::Handler.run(:menu, se)
    # TODO to be implemented
    return "{\"options\": []}"
  else
    MosEisley.logger.warn('Unknown request, ignored.')
    return {statusCode: 400}
  end
  pl = {
    Records: [
      {
        eventSource: 'MosEisley:Slack_event',
        endpoint: ep,
        body: se[:json],
      }
    ]
  }
  lc = Aws::Lambda::Client.new
  params = {
    function_name: context.function_name,
    invocation_type: 'Event',
    payload: JSON.fast_generate(pl),
  }
  r = lc.invoke(params)
  if r.status_code >= 200 && r.status_code < 300
    MosEisley.logger.debug("Successfullly invoked with playload size: #{params[:payload].length}")
  else
    MosEisley.logger.warn("Problem with invoke, status code: #{r.status_code}")
  end
  resp
end

.config(context = nil, data = nil) ⇒ Object 



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# File 'lib/mos-eisley-lambda.rb', line 14

def self.config(context = nil, data = nil)
  if data
    unless @config
      @config = Config.new(context, data)
      MosEisley.logger.info('Config loaded')
    else
      MosEisley.logger.warn('Ignored, already configured')
    end
  end
  @config
end

.handlers ⇒ Object 



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# File 'lib/handler.rb', line 2

def self.handlers
  MosEisley::Handler.handlers
end

.invoke_event(event) ⇒ Object 



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# File 'lib/mos-eisley-lambda.rb', line 172

def self.invoke_event(event)
  ep = event.dig('Records',0,'endpoint')
  se = JSON.parse(event.dig('Records',0,'body'), {symbolize_names: true})
  case ep
  when '/actions'
    MosEisley::Handler.run(:action, se)
  when '/commands'
    MosEisley::Handler.run(:command, se)
  when '/events'
    MosEisley::Handler.run(:event, se)
  when '/menus'
    MosEisley.logger.warn('Menu request cannot be processed here.')
  else
    MosEisley.logger.warn("Unknown request: #{ep}")
  end
end

.lambda_event(event, context) ⇒ Object 



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# File 'lib/mos-eisley-lambda.rb', line 26

def self.lambda_event(event, context)
  raise 'Pre-flight check failed!' unless preflightcheck(context)
  case
  when event['initializeOnly']
    MosEisley.logger.info('Dry run, initializing only')
    return
  when event['routeKey']
    # Inbound Slack event (via API GW)
    MosEisley.logger.info('API GW event')
    return apigw_event(event, context)
  when event.dig('Records',0,'eventSource') == 'MosEisley:Slack_event'
    # Internal event (via invoke)
    MosEisley.logger.info('Invoke event')
    MosEisley.logger.debug("#{event}")
    return invoke_event(event)
  when event.dig('Records',0,'eventSource').start_with?('MosEisley:Slack_message:')
    # Outbound Slack messaging request (via invoke)
    MosEisley.logger.info('Messaging event')
    MosEisley.logger.debug("#{event}")
    return # TODO implement
  else
    # Non-Slack event
    MosEisley.logger.info('Non-Slack event')
    return nonslack_event(event)
  end
end

.logger ⇒ Object 



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# File 'lib/logger.rb', line 8

def self.logger
  @logger ||= Logger.new($stdout, formatter: proc { |s, d, n, m| "#{s} : #{m}\n" })
end

.logger=(logger) ⇒ Object 



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# File 'lib/logger.rb', line 4

def self.logger=(logger)
  @logger = logger
end

.nonslack_event(event) ⇒ Object 



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# File 'lib/mos-eisley-lambda.rb', line 189

def self.nonslack_event(event)
  MosEisley::Handler.run(:nonslack, event)
end

.preflightcheck(context) ⇒ Object 



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# File 'lib/mos-eisley-lambda.rb', line 53

def self.preflightcheck(context)
  if config
    MosEisley.logger.debug("Confing already loaded at: #{config.timestamp}")
    return true
  end
  env_required = [
    'SLACK_CREDENTIALS_SSMPS_PATH',
  ]
  env_optional = [
    'MOSEISLEY_HANDLERS_DIR',
    'MOSEISLEY_LOG_LEVEL',
    'SLACK_LOG_CHANNEL_ID',
  ]
  config_required = [
    :signing_secret,
    :bot_access_token,
  ]
  l = ENV['MOSEISLEY_LOG_LEVEL']
  if String === l && ['DEBUG', 'INFO', 'WARN', 'ERROR'].include?(l.upcase)
    MosEisley.logger.level = eval("Logger::#{l.upcase}")
  end
  if dir = ENV['MOSEISLEY_HANDLERS_DIR']
    MosEisley::Handler.import_from_path(dir)
  else
    MosEisley::Handler.import
  end
  env_required.each do |v|
    if ENV[v].nil?
      MosEisley.logger.error("Missing environment variable: #{v}")
      return false
    end
    case v
    when 'SLACK_CREDENTIALS_SSMPS_PATH'
      ssm = Aws::SSM::Client.new
      rparams = {
        path: ENV['SLACK_CREDENTIALS_SSMPS_PATH'],
        with_decryption: true,
      }
      c = {}
      ssm.get_parameters_by_path(rparams).parameters.each do |prm|
        k = prm[:name].split('/').last.to_sym
        c[k] = prm[:value]
        config_required.delete(k)
      end
      unless config_required.empty?
        t = "Missing config values: #{config_required.join(', ')}"
        MosEisley.logger.error(t)
        return false
      end
      config(context, c)
    end
  end
  return true
end