I'm using Python 2.7 along with a python-slackclient. I have an attachment structure like so:
self.msg = { "attachments": [ { "fallback": "%s, %s" % (self.jiraIssueObj.fields.summary, self.link), "pretext": "Detail summary for %s" % self.jiraIssueObj, "title": self.jiraIssueObj.fields.summary, "title_link": self.link, "text": self.jiraIssueObj.fields.description[0:self.maxSummary], "color": "#7CD197", "mrkdwn_in": ["text", "pretext", "fields"] } ] } then,
def Send(self): if (self.msg): slack_client.api_call("chat.postMessage", channel=self.channel, text=self.msg, as_user=True) self.msg = None However, when this posts, it just posts the plaintext, with no formatting:
{"attachments": [{"title": "Upgrade Grafana to 3.0", "color": "#7CD197 ", "text": "Hey guys, I\u2019ve added the JIRA maillist so this email will create a ticket we can queue it up in support.\u00a0 Eric if you wouldn\u2019t mind just replying to this email with the additional info?\n\n\u00a0\n\n\u00a0\n\nSent: Thursday, August 25, 2016 11:41 AM\n", "title_link": "https://jira.jr.com/browse/ops-164", "mrkdwn_in": ["text", "pretext", "fields"], "pretext": "Detail summary for ops-164", "fallback": "Upgrade Grafana to 3.0, https://jira.jr.com/browse/ops-164"}]}
What am I doing wrong? I've tried also doing attachments=self.msg in the Send() call, but I get no output at all to my slack channel when doing that.
2 Answers
Answers 1
As it turns out, the call to
slack_client.api_call("chat.postMessage", channel=self.channel, attachments=self.msg, as_user=True) apears to add the top layer { "attachments": ... } for you. So by changing my self.msg to simply be:
self.format = [ { "fallback": "%s, %s" % (self.jiraIssueObj.fields.summary, self.link), "pretext": "Detail summary for %s" % self.jiraIssueObj, "title": self.jiraIssueObj.fields.summary, "title_link": self.link, "text": self.jiraIssueObj.fields.description[0:self.maxSummary], #"color": "#7CD197", "mrkdwn_in": ["text", "pretext", "fields"] } ] without this outer { "attachments": ... } wrapper, the api was able to post the message attachment as expected.
Answers 2
The chat.postMessage method has a couple of quirks -- like most of Slack's web APIs, it only supports application/x-www-form-urlencoded content-types, and does not support JSON. The quirkier aspect is that the attachments parameter takes a URL-encoded array of JSON. Right now, it appears you're sending the text parameter a native Python array.
For Slack to understand that structure, you'll first need to turn it into a JSON string. The API wrapper you're using can probably handle the next step of conversion into a URL-encoded representation.
Finally, the attachment itself doesn't get placed in the text of the message -- that's a separate field. You'll want to specify something more like this, after defining your JSON string as self.attachments:
slack_client.api_call("chat.postMessage", channel=self.channel, attachments=self.attachments, as_user=True)
The text field becomes optional once you include attachments.
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