Module: MosEisley

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

Overview

S3PO - Slack protocol droid in Mos Eisley

::BlockKit - Block Kit tools

v.20220201

Defined Under Namespace

Modules: S3PO, SlackEvent, SlackWeb Classes: Handler

Class Method Summary collapse

Class Method Details

.apigw_event(event, context) ⇒ Object 



85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
 
# File 'lib/mos-eisley-lambda.rb', line 85

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 ⇒ Object 



13
14
15
 
# File 'lib/mos-eisley-lambda.rb', line 13

def self.config
  @config ||= {}
end

.handlers ⇒ Object 



2
3
4
 
# File 'lib/handler.rb', line 2

def self.handlers
  MosEisley::Handler.handlers
end

.invoke_event(event) ⇒ Object 



149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
 
# File 'lib/mos-eisley-lambda.rb', line 149

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 



17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
 
# File 'lib/mos-eisley-lambda.rb', line 17

def self.lambda_event(event, context)
  raise 'Pre-flight check failed!' unless preflightcheck
  case
  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)
  else
    # Unknown event
    MosEisley.logger.info('Unknown event')
    return unknown_event(event)
  end
end

.logger ⇒ Object 



8
9
10
 
# 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 



4
5
6
 
# File 'lib/logger.rb', line 4

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

.preflightcheck ⇒ Object 



36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
 
# File 'lib/mos-eisley-lambda.rb', line 36

def self.preflightcheck
  if config[:timestamp]
    MosEisley.logger.debug("Confing already loaded at: #{config[:timestamp]}")
    return true
  end
  env_required = [
    'SLACK_CREDENTIALS_SSMPS_PATH',
  ]
  env_optional = [
    '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
  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,
      }
      ssm.get_parameters_by_path(rparams).parameters.each do |prm|
        k = prm[:name].split('/').last.to_sym
        config[k] = prm[:value]
        config_required.delete(k)
      end
    end
  end
  unless config_required.empty?
    t = "Missing config values: #{config_required.join(', ')}"
    MosEisley.logger.error(t)
    return false
  end
  config[:timestamp] = Time.now
  MosEisley.logger.info('Config loaded')
  return true
end

.unknown_event(event) ⇒ Object 



166
167
168
 
# File 'lib/mos-eisley-lambda.rb', line 166

def self.unknown_event(event)
  # TODO hand off to a handler
end