initial quick and dirty implementation

slackline.go

@@ -1,13 +1,82 @@
 package main
 
 import (
+	"bytes"
+	"encoding/json"
+	"errors"
+	"fmt"
 	"github.com/codegangsta/martini"
+	"io/ioutil"
+	"net/http"
+	"os"
 )
 
+const postMessageURL = "https://espresso.slack.com/services/hooks/incoming-webhook?token="
+
+type slackMessage struct {
+	Channel  string `json:"channel"`
+	Username string `json:"username"`
+	Text     string `json:"text"`
+}
+
+func (s slackMessage) json() (msg string, err error) {
+	m, err := json.Marshal(s)
+	if err != nil {
+		return
+	}
+	msg = string(m[:])
+	return
+}
+
+func (s slackMessage) send() (err error) {
+	json, err := json.Marshal(s)
+	if err != nil {
+		return
+	}
+	//res, err := http.PostForm(postMessageURL, url.Values{"payload": {json}})
+	content := []byte("payload=")
+	content = append(content, json...)
+	reader := bytes.NewReader(content)
+	res, err := http.Post(
+		postMessageURL+os.Getenv("SLACK_TOKEN"),
+		"application/x-www-form-urlencoded",
+		reader,
+	)
+	if res.StatusCode != 200 {
+		defer res.Body.Close()
+		body, _ := ioutil.ReadAll(res.Body)
+		return errors.New(res.Status + " - " + string(body))
+	}
+	return
+}
+
 func main() {
 	m := martini.Classic()
 	m.Get("/", func() string {
-		return "Hello world!"
+		message := slackMessage{"#echo", "ernesto", "ernesto, probando, un dos tres"}
+		message.send()
+		msg, err := message.json()
+		if err != nil {
+			return err.Error()
+		} else {
+			return msg
+		}
+		//return "Hello world!"
+	})
+	m.Post("/post", func(res http.ResponseWriter, req *http.Request) {
+		msg := slackMessage{
+			Channel:  "#echo",
+			Username: req.PostFormValue("user_name"),
+			Text:     req.PostFormValue("text"),
+		}
+		fmt.Printf("Received %#v\n", msg)
+		err := msg.send()
+		if err != nil {
+			fmt.Printf("Error: %s\n", err.Error())
+			res.WriteHeader(500)
+		} else {
+			fmt.Println("Sent")
+		}
 	})
 	m.Run()
 }