def delete_message(id):
with get_message_history() as message_history:
message, is_most_recent = message_for_ts(message_history, id)
if message:
message_history.remove(message)
if is_most_recent and message_history:
send_state(message_history[-1])
def store_message(id, html):
with get_message_history() as message_history:
message_history.append({
"id": id,
"html": html,
"reactions": [],
"color": "#fff",
})
send_state(message_history[-1])
def store_image(event, file_response):
""" Add requested file to message_history """
encoded_image = "data:%s;base64,%s" % (
file_response.headers['Content-Type'],
base64.b64encode(file_response.content).decode())
with get_message_history() as message_history:
message_history.append({
"id": event['ts'],
"image": encoded_image,
"reactions": [],
"color": "#fff",
})
send_state(message_history[-1])
def handle_reactions(message, is_most_recent):
old_color = message['color']
new_color = None
for reaction in message['reactions']:
if 'night' in reaction:
new_color = "#000"
else:
new_color = next((color for color in colors if color in reaction),
None)
if new_color:
break
if old_color != new_color:
message["color"] = new_color or '#fff'
if is_most_recent:
send_state({"color": message["color"]})
def slack_event(request):
""" Handle message from Slack. """
verify_slack_request(request)
event = json.loads(request.body.decode("utf-8"))
logger.info(event)
# url verification
if event["type"] == "url_verification":
return HttpResponse(event["challenge"], content_type='text/plain')
event = event["event"]
# message in channel
if event["type"] == "message":
message_type = event.get("subtype")
# handle uploaded image
if message_type == "file_share":
# {
# 'type': 'message',
# 'files': [{
# 'filetype': 'png',
# 'url_private': 'https://files.slack.com/files-pri/T02RW19TT-FBY895N1Z/image.png'
# }],
# 'ts': '1532713362.000505',
# 'subtype': 'file_share',
# }
file_info = event["files"][0]
if file_info["filetype"] in ("jpg", "gif", "png"):
# if image, fetch file and send to listeners
file_response = requests.get(file_info["url_private"], headers={"Authorization": "Bearer %s" % settings.SLACK["bot_access_token"]})
if file_response.headers['Content-Type'].startswith('text/html'):
logger.error("Failed to fetch image; check bot_access_token")
else:
store_image(event, file_response)
# handle image URL
elif event.get('message') and event['message'].get('attachments') and event['message']['attachments'][0].get('image_url'):
# what we get when slack unfurls an image URL -- a nested message:
# {
# 'type': 'message',
# 'subtype': 'message_changed',
# 'message': {
# 'attachments': [{
# 'image_url': 'some external url'
# }],
# 'ts': '1532713362.000505',
# },
# }
try:
file_response = requests.get(event['message']['attachments'][0]['image_url'])
assert file_response.ok
assert any(file_response.headers['Content-Type'].startswith(prefix) for prefix in ('image/jpeg', 'image/gif', 'image/png'))
except (requests.RequestException, AssertionError) as e:
logger.error("Failed to fetch URL: %s" % e)
else:
store_image(event['message'], file_response)
# handle message deleted
elif message_type == "message_deleted" and event.get('previous_message'):
with get_message_history() as message_history:
message, is_most_recent = message_for_ts(message_history, event['previous_message']['ts'])
if message:
message_history.pop()
if is_most_recent and message_history:
send_state(message_history[-1])
# handle reactions
elif event["type"] == "reaction_added":
# {
# 'type': 'reaction_added',
# 'user': '******',
# 'item': {'type': 'message', 'channel': 'CBU9W589K', 'ts': '1532713362.000505'},
# 'reaction': 'rage',
# 'item_user': '******',
# 'event_ts': '1532713400.000429'
# }
with get_message_history() as message_history:
message, is_most_recent = message_for_ts(message_history, event['item']['ts'])
if message:
message['reactions'].insert(0, event["reaction"])
handle_reactions(message, is_most_recent)
elif event["type"] == "reaction_removed":
with get_message_history() as message_history:
message, is_most_recent = message_for_ts(message_history, event['item']['ts'])
if message:
try:
message['reactions'].remove(event["reaction"])
except ValueError:
pass
else:
handle_reactions(message, is_most_recent)
# tell Slack not to resend
return HttpResponse()