opensaps/slack/slackhandler.go

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// OpenSAPS - Open Slack API server for everyone.
//
// Copyright (c) 2017, Stanislav N. aka pztrn.
// All rights reserved.
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package slack
import (
"encoding/json"
"fmt"
"io/ioutil"
"net/http"
"net/url"
"strings"
slackmessage "go.dev.pztrn.name/opensaps/slack/message"
)
type Handler struct{}
func (sh Handler) ServeHTTP(respwriter http.ResponseWriter, req *http.Request) {
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ctx.Log.Debug().Str("method", req.Method).Str("host", req.Host).Str("path", req.URL.Path).Msg("Received HTTP request")
// We should catch only POST requests. Otherwise return HTTP 404.
if req.Method != "POST" {
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ctx.Log.Debug().Msg("Not a POST request, returning HTTP 404")
respwriter.WriteHeader(http.StatusNotFound)
fmt.Fprintf(respwriter, "NOT FOUND")
return
}
body, _ := ioutil.ReadAll(req.Body)
req.Body.Close()
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ctx.Log.Debug().Msgf("Received body: %s", string(body))
// Try to figure out where we should push received data.
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cfg := ctx.Config.GetConfig()
var sentToPusher bool
for name, config := range cfg.Webhooks {
if strings.Contains(req.URL.Path, config.Slack.Random1) &&
strings.Contains(req.URL.Path, config.Slack.Random2) &&
strings.Contains(req.URL.Path, config.Slack.LongRandom) {
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ctx.Log.Debug().Msgf("Passed data belongs to '%s' and should go to '%s' pusher, protocol '%s'",
name, config.Remote.PushTo, config.Remote.Pusher)
// Parse message into SlackMessage structure.
if strings.Contains(string(body)[0:7], "payload") {
// We have HTTP form payload. It still should be a
// parseable JSON string, we just need to do some
// preparations.
// First - remove "payload=" from the beginning.
tempBody := string(body)
tempBody = strings.Replace(tempBody, "payload=", "", 1)
// Second - unescape data.
tempBody, err := url.QueryUnescape(tempBody)
if err != nil {
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ctx.Log.Error().Msg("Failed to decode body into parseable string!")
return
}
// And finally - convert body back to bytes.
body = []byte(tempBody)
}
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// nolint:exhaustruct
slackmsg := slackmessage.SlackMessage{}
err := json.Unmarshal(body, &slackmsg)
if err != nil {
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ctx.Log.Error().Err(err).Msg("Failed to decode JSON into SlackMessage struct")
return
}
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ctx.Log.Debug().Msgf("Received message: %+v", slackmsg)
ctx.SendToPusher(config.Remote.Pusher, config.Remote.PushTo, slackmsg)
sentToPusher = true
}
}
if !sentToPusher {
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ctx.Log.Debug().Msg("Don't know where to push data. Ignoring with HTTP 404")
respwriter.WriteHeader(http.StatusNotFound)
fmt.Fprintf(respwriter, "NOT FOUND")
}
}