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 = base64.b64encode(gsheets_pickle)
41 print("Storing refreshed GSheets credentials into SSM")
42 ssm.put_parameter(Name='GSHEETS_PICKLE_BASE64',
44 Value=str(gsheets_pickle_base64),
46 service = build('sheets',
48 credentials=gsheets_creds,
49 cache_discovery=False)
50 sheets = service.spreadsheets()
52 db = boto3.resource('dynamodb')
54 turb = SimpleNamespace()
55 turb.slack_client = slack_client
60 """Generate an error response for a Slack request
62 This will print the error message (so that it appears in CloudWatch
63 logs) and will then return a dictionary suitable for returning
64 as an error response."""
66 print("Error: {}.".format(message))
73 def turbot_lambda(event, context):
74 """Top-level entry point for our lambda function.
76 This function first verifies that the request actually came from
77 Slack, (by means of the SLACK_SIGNING_SECRET SSM parameter), and
78 refuses to do anything if not.
80 Then this defers to either turbot_event_handler or
81 turbot_slash_command to do any real work.
84 headers = requests.structures.CaseInsensitiveDict(event['headers'])
86 signature = headers['X-Slack-Signature']
87 timestamp = headers['X-Slack-Request-Timestamp']
89 if not slack_is_valid_request(signature, timestamp, event['body']):
90 return error("Invalid Slack signature")
92 # It's a bit cheesy, but we'll just use the content-type header to
93 # determine if we're being called from a Slack event or from a
94 # slash command or other interactivity. (The more typical way to
95 # do this would be to have different URLs for each Slack entry
96 # point, but it's simpler to have our Slack app implemented as a
97 # single AWS Lambda, (which can only have a single entry point).
98 content_type = headers['content-type']
100 if (content_type == "application/json"):
101 return turbot_event_handler(turb, event, context)
102 if (content_type == "application/x-www-form-urlencoded"):
103 return turbot_interactive_or_slash_command(turb, event, context)
104 return error("Unknown content-type: {}".format(content_type))
106 def turbot_event_handler(turb, event, context):
107 """Handler for all subscribed Slack events"""
109 body = json.loads(event['body'])
113 if type == 'url_verification':
114 return url_verification_handler(turb, body)
115 if type == 'event_callback':
116 return event_callback_handler(turb, body)
117 return error("Unknown event type: {}".format(type))
119 def url_verification_handler(turb, body):
121 # First, we have to properly respond to url_verification
122 # challenges or else Slack won't let us configure our URL as an
124 challenge = body['challenge']
131 def event_callback_handler(turb, body):
132 type = body['event']['type']
134 if type in turbot.events.events:
135 return turbot.events.events[type](turb, body)
136 return error("Unknown event type: {}".format(type))
138 def turbot_interactive_or_slash_command(turb, event, context):
139 """Handler for Slack interactive things (buttons, shortcuts, etc.)
140 as well as slash commands.
142 This function simply makes a quiuck determination of what we're looking
143 at and then defers to either turbot_interactive or turbot_slash_command."""
145 # Both interactives and slash commands have a urlencoded body
146 body = parse_qs(event['body'])
148 # The difference is that an interactive thingy has a 'payload'
149 # while a slash command has a 'command'
150 if 'payload' in body:
151 return turbot_interactive(turb, json.loads(body['payload'][0]))
152 if 'command' in body:
153 return turbot_slash_command(turb, body)
154 return error("Unrecognized event (neither interactive nor slash command)")
156 def turbot_interactive(turb, payload):
157 """Handler for Slack interactive requests
159 These are the things that come from a user interacting with a button
160 a shortcut or some other interactive element that our app has made
161 available to the user."""
163 type = payload['type']
165 if type == 'block_actions':
166 return turbot_block_action(turb, payload)
167 if type == 'view_submission':
168 return turbot.actions.view_submission(turb, payload)
169 return error("Unrecognized interactive type: {}".format(type))
171 def turbot_block_action(turb, payload):
172 """Handler for Slack interactive block actions
174 Specifically, those that have a payload type of 'block_actions'"""
176 actions = payload['actions']
178 if len(actions) != 1:
179 return error("No support for multiple actions ({}) in a single request"
180 .format(len(actions)))
184 atype = action['type']
185 avalue = action['value']
188 atype in turbot.actions.actions
189 and avalue in turbot.actions.actions[atype]
191 return turbot.actions.actions[atype][avalue](turb, payload)
192 return error("Unknown action of type/value: {}/{}".format(atype, avalue))
194 def turbot_slash_command(turb, body):
195 """Implementation for Slack slash commands.
197 This parses the request and arguments and farms out to
198 supporting functions to implement all supported slash commands.
201 command = body['command'][0]
202 args = body['text'][0]
204 if command in turbot.commands.commands:
205 return turbot.commands.commands[command](turb, body, args)
207 return error("Command {} not implemented".format(command))