from urllib.parse import parse_qs
-from turbot.rot import rot
from slack import WebClient
import boto3
import requests
-import hashlib
-import hmac
import json
+import os
+
+import turbot.actions
+import turbot.commands
+import turbot.events
+import turbot.views
ssm = boto3.client('ssm')
response = ssm.get_parameter(Name='SLACK_SIGNING_SECRET', WithDecryption=True)
-slack_signing_secret = bytes(response['Parameter']['Value'], 'utf-8')
+slack_signing_secret = response['Parameter']['Value']
+os.environ['SLACK_SIGNING_SECRET'] = slack_signing_secret
+
+# Note: Late import here to have the environment variable above available
+from turbot.slack import slack_is_valid_request # noqa
response = ssm.get_parameter(Name='SLACK_BOT_TOKEN', WithDecryption=True)
slack_bot_token = response['Parameter']['Value']
'body': ''
}
-def slack_is_valid_request(slack_signature, timestamp, body):
- """Returns True if the timestamp and body correspond to signature.
-
- This implements the Slack signature verification using the slack
- signing secret (obtained via an SSM parameter in code above)."""
-
- content = "v0:{}:{}".format(timestamp,body).encode('utf-8')
-
- signature = 'v0=' + hmac.new(slack_signing_secret,
- content,
- hashlib.sha256).hexdigest()
-
- if hmac.compare_digest(signature, slack_signature):
- return True
- else:
- print("Bad signature: {} != {}".format(signature, slack_signature))
- return False
-
def turbot_lambda(event, context):
"""Top-level entry point for our lambda function.
return error("Invalid Slack signature")
# It's a bit cheesy, but we'll just use the content-type header to
- # determine if we're being called from a slash command or from a
- # slack event. (The more typical way to do this would be to have
- # different routes setup, but I want a single function, and with
- # AWS Lambda I don't have the option to have multiple defined
- # entry-point functions.
- if (headers['Content-Type'] == "application/json"):
+ # determine if we're being called from a Slack event or from a
+ # slash command or other interactivity. (The more typical way to
+ # do this would be to have different URLs for each Slack entry
+ # point, but it's simpler to have our Slack app implemented as a
+ # single AWS Lambda, (which can only have a single entry point).
+ content_type = headers['content-type']
+
+ if (content_type == "application/json"):
return turbot_event_handler(event, context)
- else:
- return turbot_slash_command(event, context)
+ if (content_type == "application/x-www-form-urlencoded"):
+ return turbot_interactive_or_slash_command(event, context)
+ return error("Unknown content-type: {}".format(content_type))
def turbot_event_handler(event, context):
"""Handler for all subscribed Slack events"""
def event_callback_handler(body):
type = body['event']['type']
- if type == 'app_home_opened':
- return app_home_opened_handler(body)
+ if type in turbot.events.events:
+ return turbot.events.events[type](slack_client, body)
return error("Unknown event type: {}".format(type))
-def app_home_opened_handler(body):
- slack_client.views_publish(user_id=body['event']['user'],
- view={
- "type": "home",
- "blocks": [
- {
- "type": "section",
- "text": {
- "type": "mrkdwn",
- "text": "A simple stack of blocks for the simple sample Block Kit Home tab."
- }
- },
- {
- "type": "actions",
- "elements": [
- {
- "type": "button",
- "text": {
- "type": "plain_text",
- "text": "Action A",
- "emoji": True
- }
- },
- {
- "type": "button",
- "text": {
- "type": "plain_text",
- "text": "Action B",
- "emoji": True
- }
- }
- ]
- }
- ]
- })
- return "OK"
-
-def turbot_slash_command(event, context):
- """Implementation for Slack slash commands.
+def turbot_interactive_or_slash_command(event, context):
+ """Handler for Slack interactive things (buttons, shortcuts, etc.)
+ as well as slash commands.
- This parses the request and arguments and farms out to
- supporting functions to implement all supported slash commands.
- """
+ This function simply makes a quiuck determination of what we're looking
+ at and then defers to either turbot_interactive or turbot_slash_command."""
+ # Both interactives and slash commands have a urlencoded body
body = parse_qs(event['body'])
- command = body['command'][0]
- args = body['text'][0]
- if (command == "/rotlambda" or command == "/rot"):
- return rot_slash_command(body, args)
+ # The difference is that an interactive thingy has a 'payload'
+ # while a slash command has a 'command'
+ if 'payload' in body:
+ return turbot_interactive(json.loads(body['payload'][0]))
+ if 'command' in body:
+ return turbot_slash_command(body)
+ return error("Unrecognized event (neither interactive nor slash command)")
- return error("Command {} not implemented".format(command))
+def turbot_interactive(payload):
+ """Handler for Slack interactive requests
-def rot_slash_command(body, args):
- """Implementation of the /rot command
+ These are the things that come from a user interacting with a button
+ a shortcut or some other interactive element that our app has made
+ available to the user."""
- The args string should be as follows:
+ type = payload['type']
- [count|*] String to be rotated
+ if type == 'block_actions':
+ return turbot_block_action(payload)
+ return error("Unrecognized interactive type: {}".format(type))
- That is, the first word of the string is an optional number (or
- the character '*'). If this is a number it indicates an amount to
- rotate each character in the string. If the count is '*' or is not
- present, then the string will be rotated through all possible 25
- values.
+def turbot_block_action(payload):
+ """Handler for Slack interactive block actions
- The result of the rotation is returned (with Slack formatting) in
- the body of the response so that Slack will provide it as a reply
- to the user who submitted the slash command."""
+ Specifically, those that have a payload type of 'block_actions'"""
- channel_name = body['channel_name'][0]
- response_url = body['response_url'][0]
- channel_id = body['channel_id'][0]
+ actions = payload['actions']
- result = rot(args)
+ if len(actions) != 1:
+ return error("No support for multiple actions ({}) in a single request"
+ .format(len(actions)))
- if (channel_name == "directmessage"):
- requests.post(response_url,
- json = {"text": result},
- headers = {"Content-type": "application/json"})
- else:
- slack_client.chat_postMessage(channel=channel_id, text=result)
+ action = actions[0]
- return {
- 'statusCode': 200,
- 'body': ""
- }
+ atype = action['type']
+ avalue = action['value']
+
+ if (
+ atype in turbot.actions.actions
+ and avalue in turbot.actions.actions[atype]
+ ):
+ return turbot.actions.actions[atype][avalue](payload)
+ return error("Unknown action of type/value: {}/{}".format(atype, avalue))
+
+def turbot_slash_command(body):
+ """Implementation for Slack slash commands.
+
+ This parses the request and arguments and farms out to
+ supporting functions to implement all supported slash commands.
+ """
+
+ command = body['command'][0]
+ args = body['text'][0]
+
+ if command in turbot.commands.commands:
+ return turbot.commands.commands[command](slack_client, body, args)
+
+ return error("Command {} not implemented".format(command))
projects / turbot / blobdiff