1 from urllib.parse import parse_qs
2 from slack import WebClient
9 from types import SimpleNamespace
10 from google.auth.transport.requests import Request
11 from googleapiclient.discovery import build
13 import turbot.interaction
16 ssm = boto3.client('ssm')
18 # Note: Late import here to have the environment variable above available
19 from turbot.slack import slack_is_valid_request # noqa
21 if 'SLACK_BOT_TOKEN' in os.environ:
22 slack_bot_token = os.environ['SLACK_BOT_TOKEN']
24 response = ssm.get_parameter(Name='SLACK_BOT_TOKEN', WithDecryption=True)
25 slack_bot_token = response['Parameter']['Value']
26 os.environ['SLACK_BOT_TOKEN'] = slack_bot_token
27 slack_client = WebClient(slack_bot_token)
29 if 'GSHEETS_PICKLE_BASE64' in os.environ:
30 gsheets_pick_base64 = os.environ['GSHEETS_PICKLE_BASE64']
32 response = ssm.get_parameter(Name='GSHEETS_PICKLE_BASE64',
34 gsheets_pickle_base64 = response['Parameter']['Value']
35 os.environ['GSHEETS_PICKLE_BASE64'] = gsheets_pickle_base64
36 gsheets_pickle = base64.b64decode(gsheets_pickle_base64)
37 gsheets_creds = pickle.loads(gsheets_pickle)
40 if gsheets_creds.valid:
41 print("Loaded valid GSheets credentials from SSM")
43 gsheets_creds.refresh(Request())
44 gsheets_pickle = pickle.dumps(gsheets_creds)
45 gsheets_pickle_base64_bytes = base64.b64encode(gsheets_pickle)
46 gsheets_pickle_base64 = gsheets_pickle_base64_bytes.decode('us-ascii')
47 print("Storing refreshed GSheets credentials into SSM")
48 os.environ['GSHEETS_PICKLE_BASE64'] = gsheets_pickle_base64
49 ssm.put_parameter(Name='GSHEETS_PICKLE_BASE64',
51 Value=gsheets_pickle_base64,
53 service = build('sheets',
55 credentials=gsheets_creds,
56 cache_discovery=False)
57 sheets = service.spreadsheets()
58 service = build('drive',
60 credentials=gsheets_creds,
61 cache_discovery=False)
62 permissions = service.permissions()
64 db = boto3.resource('dynamodb')
66 turb = SimpleNamespace()
67 turb.slack_client = slack_client
69 turb.table = db.Table("turbot")
71 turb.permissions = permissions
74 """Generate an error response for a Slack request
76 This will print the error message (so that it appears in CloudWatch
77 logs) and will then return a dictionary suitable for returning
78 as an error response."""
80 print("Error: {}.".format(message))
87 def turbot_lambda(event, context):
88 """Top-level entry point for our lambda function.
90 This function first verifies that the request actually came from
91 Slack, (by means of the SLACK_SIGNING_SECRET SSM parameter), and
92 refuses to do anything if not.
94 Then this defers to either turbot_event_handler or
95 turbot_slash_command to do any real work.
98 headers = requests.structures.CaseInsensitiveDict(event['headers'])
100 signature = headers['X-Slack-Signature']
101 timestamp = headers['X-Slack-Request-Timestamp']
103 if not slack_is_valid_request(signature, timestamp, event['body']):
104 return error("Invalid Slack signature")
106 # It's a bit cheesy, but we'll just use the content-type header to
107 # determine if we're being called from a Slack event or from a
108 # slash command or other interactivity. (The more typical way to
109 # do this would be to have different URLs for each Slack entry
110 # point, but it's simpler to have our Slack app implemented as a
111 # single AWS Lambda, (which can only have a single entry point).
112 content_type = headers['content-type']
114 if (content_type == "application/json"):
115 return turbot_event_handler(turb, event, context)
116 if (content_type == "application/x-www-form-urlencoded"):
117 return turbot_interactive_or_slash_command(turb, event, context)
118 return error("Unknown content-type: {}".format(content_type))
120 def turbot_event_handler(turb, event, context):
121 """Handler for all subscribed Slack events"""
123 body = json.loads(event['body'])
127 if type == 'url_verification':
128 return url_verification_handler(turb, body)
129 if type == 'event_callback':
130 return event_callback_handler(turb, body)
131 return error("Unknown event type: {}".format(type))
133 def url_verification_handler(turb, body):
135 # First, we have to properly respond to url_verification
136 # challenges or else Slack won't let us configure our URL as an
138 challenge = body['challenge']
145 def event_callback_handler(turb, body):
146 event = body['event']
149 if type in turbot.events.events:
150 return turbot.events.events[type](turb, event)
151 return error("Unknown event type: {}".format(type))
153 def turbot_interactive_or_slash_command(turb, event, context):
154 """Handler for Slack interactive things (buttons, shortcuts, etc.)
155 as well as slash commands.
157 This function simply makes a quick determination of what we're looking
158 at and then defers to either turbot_interactive or turbot_slash_command."""
160 # Both interactives and slash commands have a urlencoded body
161 body = parse_qs(event['body'])
163 # The difference is that an interactive thingy has a 'payload'
164 # while a slash command has a 'command'
165 if 'payload' in body:
166 return turbot_interactive(turb, json.loads(body['payload'][0]))
167 if 'command' in body:
168 return turbot_slash_command(turb, body)
169 return error("Unrecognized event (neither interactive nor slash command)")
171 def turbot_interactive(turb, payload):
172 """Handler for Slack interactive requests
174 These are the things that come from a user interacting with a button
175 a shortcut or some other interactive element that our app has made
176 available to the user."""
178 type = payload['type']
180 if type == 'block_actions':
181 return turbot_block_action(turb, payload)
182 if type == 'view_submission':
183 return turbot.interaction.view_submission(turb, payload)
184 if type == 'shortcut':
185 return turbot_shortcut(turb, payload)
186 return error("Unrecognized interactive type: {}".format(type))
188 def turbot_block_action(turb, payload):
189 """Handler for Slack interactive block actions
191 Specifically, those that have a payload type of 'block_actions'"""
193 actions = payload['actions']
195 if len(actions) != 1:
196 return error("No support for multiple actions ({}) in a single request"
197 .format(len(actions)))
201 atype = action['type']
202 if 'value' in action:
203 avalue = action['value']
208 atype in turbot.interaction.actions
209 and avalue in turbot.interaction.actions[atype]
211 return turbot.interaction.actions[atype][avalue](turb, payload)
212 return error("Unknown action of type/value: {}/{}".format(atype, avalue))
214 def turbot_shortcut(turb, payload):
215 """Handler for Slack shortcuts
217 These are invoked as either global or message shortcuts by a user."""
219 print("In turbot_shortcut, payload is: {}".format(str(payload)))
221 return error("Shortcut interactions not yet implemented")
223 def turbot_slash_command(turb, body):
224 """Implementation for Slack slash commands.
226 This parses the request and arguments and farms out to
227 supporting functions to implement all supported slash commands.
230 command = body['command'][0]
232 args = body['text'][0]
236 if command in turbot.interaction.commands:
237 return turbot.interaction.commands[command](turb, body, args)
239 return error("Command {} not implemented".format(command))