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
14 import turbot.commands
17 ssm = boto3.client('ssm')
19 response = ssm.get_parameter(Name='SLACK_SIGNING_SECRET', WithDecryption=True)
20 slack_signing_secret = response['Parameter']['Value']
21 os.environ['SLACK_SIGNING_SECRET'] = slack_signing_secret
23 # Note: Late import here to have the environment variable above available
24 from turbot.slack import slack_is_valid_request # noqa
26 response = ssm.get_parameter(Name='SLACK_BOT_TOKEN', WithDecryption=True)
27 slack_bot_token = response['Parameter']['Value']
28 slack_client = WebClient(slack_bot_token)
30 response = ssm.get_parameter(Name='GSHEETS_PICKLE_BASE64', WithDecryption=True)
31 gsheets_pickle_base64 = response['Parameter']['Value']
32 gsheets_pickle = base64.b64decode(gsheets_pickle_base64)
33 gsheets_creds = pickle.loads(gsheets_pickle)
35 if gsheets_creds.valid:
36 print("Loaded valid GSheets credentials from SSM")
38 gsheets_creds.refresh(Request())
39 gsheets_pickle = pickle.dumps(gsheets_creds)
40 gsheets_pickle_base64_bytes = base64.b64encode(gsheets_pickle)
41 gsheets_pickle_base64 = gsheets_pickle_base64_bytes.decode('us-ascii')
42 print("Storing refreshed GSheets credentials into SSM")
43 ssm.put_parameter(Name='GSHEETS_PICKLE_BASE64',
45 Value=gsheets_pickle_base64,
47 service = build('sheets',
49 credentials=gsheets_creds,
50 cache_discovery=False)
51 sheets = service.spreadsheets()
53 db = boto3.resource('dynamodb')
55 turb = SimpleNamespace()
56 turb.slack_client = slack_client
61 """Generate an error response for a Slack request
63 This will print the error message (so that it appears in CloudWatch
64 logs) and will then return a dictionary suitable for returning
65 as an error response."""
67 print("Error: {}.".format(message))
74 def turbot_lambda(event, context):
75 """Top-level entry point for our lambda function.
77 This function first verifies that the request actually came from
78 Slack, (by means of the SLACK_SIGNING_SECRET SSM parameter), and
79 refuses to do anything if not.
81 Then this defers to either turbot_event_handler or
82 turbot_slash_command to do any real work.
85 headers = requests.structures.CaseInsensitiveDict(event['headers'])
87 signature = headers['X-Slack-Signature']
88 timestamp = headers['X-Slack-Request-Timestamp']
90 if not slack_is_valid_request(signature, timestamp, event['body']):
91 return error("Invalid Slack signature")
93 # It's a bit cheesy, but we'll just use the content-type header to
94 # determine if we're being called from a Slack event or from a
95 # slash command or other interactivity. (The more typical way to
96 # do this would be to have different URLs for each Slack entry
97 # point, but it's simpler to have our Slack app implemented as a
98 # single AWS Lambda, (which can only have a single entry point).
99 content_type = headers['content-type']
101 if (content_type == "application/json"):
102 return turbot_event_handler(turb, event, context)
103 if (content_type == "application/x-www-form-urlencoded"):
104 return turbot_interactive_or_slash_command(turb, event, context)
105 return error("Unknown content-type: {}".format(content_type))
107 def turbot_event_handler(turb, event, context):
108 """Handler for all subscribed Slack events"""
110 body = json.loads(event['body'])
114 if type == 'url_verification':
115 return url_verification_handler(turb, body)
116 if type == 'event_callback':
117 return event_callback_handler(turb, body)
118 return error("Unknown event type: {}".format(type))
120 def url_verification_handler(turb, body):
122 # First, we have to properly respond to url_verification
123 # challenges or else Slack won't let us configure our URL as an
125 challenge = body['challenge']
132 def event_callback_handler(turb, body):
133 type = body['event']['type']
135 if type in turbot.events.events:
136 return turbot.events.events[type](turb, body)
137 return error("Unknown event type: {}".format(type))
139 def turbot_interactive_or_slash_command(turb, event, context):
140 """Handler for Slack interactive things (buttons, shortcuts, etc.)
141 as well as slash commands.
143 This function simply makes a quiuck determination of what we're looking
144 at and then defers to either turbot_interactive or turbot_slash_command."""
146 # Both interactives and slash commands have a urlencoded body
147 body = parse_qs(event['body'])
149 # The difference is that an interactive thingy has a 'payload'
150 # while a slash command has a 'command'
151 if 'payload' in body:
152 return turbot_interactive(turb, json.loads(body['payload'][0]))
153 if 'command' in body:
154 return turbot_slash_command(turb, body)
155 return error("Unrecognized event (neither interactive nor slash command)")
157 def turbot_interactive(turb, payload):
158 """Handler for Slack interactive requests
160 These are the things that come from a user interacting with a button
161 a shortcut or some other interactive element that our app has made
162 available to the user."""
164 type = payload['type']
166 if type == 'block_actions':
167 return turbot_block_action(turb, payload)
168 if type == 'view_submission':
169 return turbot.actions.view_submission(turb, payload)
170 if type == 'shortcut':
171 return turbot_shortcut(turb, payload);
172 return error("Unrecognized interactive type: {}".format(type))
174 def turbot_block_action(turb, payload):
175 """Handler for Slack interactive block actions
177 Specifically, those that have a payload type of 'block_actions'"""
179 actions = payload['actions']
181 if len(actions) != 1:
182 return error("No support for multiple actions ({}) in a single request"
183 .format(len(actions)))
187 atype = action['type']
188 avalue = action['value']
191 atype in turbot.actions.actions
192 and avalue in turbot.actions.actions[atype]
194 return turbot.actions.actions[atype][avalue](turb, payload)
195 return error("Unknown action of type/value: {}/{}".format(atype, avalue))
197 def turbot_shortcut(turb, payload):
198 """Handler for Slack shortcuts
200 These are invoked as either global or message shortcuts by a user."""
202 print("In turbot_shortcut, payload is: {}".format(str(payload)))
204 return error("Shortcut interactions not yet implemented")
206 def turbot_slash_command(turb, body):
207 """Implementation for Slack slash commands.
209 This parses the request and arguments and farms out to
210 supporting functions to implement all supported slash commands.
213 command = body['command'][0]
215 args = body['text'][0]
219 if command in turbot.commands.commands:
220 return turbot.commands.commands[command](turb, body, args)
222 return error("Command {} not implemented".format(command))