forked from paulhammond/slackcat
/
slackcat.go
149 lines (128 loc) · 2.76 KB
/
slackcat.go
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// Copyright 2014 Paul Hammond.
// This software is licensed under the MIT license, see LICENSE.txt for details.
package main
import (
"bufio"
"encoding/json"
"errors"
"fmt"
"log"
"net/http"
"net/url"
"os"
"os/user"
"strings"
"github.com/ogier/pflag"
)
type Config struct {
WebhookUrl string `json:"webhook_url"`
Channel string `json:"channel"`
}
func ReadConfig() (*Config, error) {
homeDir := ""
usr, err := user.Current()
if err == nil {
homeDir = usr.HomeDir
}
for _, path := range []string{"/etc/slackcat.conf", homeDir + "/.slackcat.conf", "./slackcat.conf"} {
file, err := os.Open(path)
if os.IsNotExist(err) {
continue
}
if err != nil {
return nil, err
}
json.NewDecoder(file)
conf := Config{}
err = json.NewDecoder(file).Decode(&conf)
if err != nil {
return nil, err
}
return &conf, nil
}
return &Config{}, nil
}
type SlackMsg struct {
Channel string `json:"channel"`
Username string `json:"username"`
Text string `json:"text"`
Parse string `json:"parse"`
}
func (m SlackMsg) Encode() (string, error) {
b, err := json.Marshal(m)
if err != nil {
return "", err
}
return string(b), nil
}
func (m SlackMsg) Post(WebhookURL string) error {
encoded, err := m.Encode()
if err != nil {
return err
}
resp, err := http.PostForm(WebhookURL, url.Values{"payload": {encoded}})
if err != nil {
return err
}
if resp.StatusCode != http.StatusOK {
return errors.New("Not OK")
}
return nil
}
func username() string {
username := "<unknown>"
usr, err := user.Current()
if err == nil {
username = usr.Username
}
hostname := "<unknown>"
host, err := os.Hostname()
if err == nil {
hostname = host
}
return fmt.Sprintf("%s@%s", username, hostname)
}
func main() {
cfg, err := ReadConfig()
if err != nil {
log.Fatalf("Coult not read config: %v", err)
}
pflag.Usage = func() {
fmt.Fprintln(os.Stderr, "Usage: slackcat [-c #channel] [-n name] [message]")
}
channel := pflag.StringP("channel", "c", cfg.Channel, "channel")
name := pflag.StringP("name", "n", username(), "name")
pflag.Parse()
// was there a message on the command line? If so use it.
args := pflag.Args()
if len(args) > 0 {
msg := SlackMsg{
Channel: *channel,
Username: *name,
Parse: "full",
Text: strings.Join(args, " "),
}
err = msg.Post(cfg.WebhookUrl)
if err != nil {
log.Fatalf("Post failed: %v", err)
}
os.Exit(0)
}
// ...Otherwise scan stdin
scanner := bufio.NewScanner(os.Stdin)
for scanner.Scan() {
msg := SlackMsg{
Channel: *channel,
Username: *name,
Parse: "full",
Text: scanner.Text(),
}
err = msg.Post(cfg.WebhookUrl)
if err != nil {
log.Fatalf("Post failed: %v", err)
}
}
if err := scanner.Err(); err != nil {
log.Fatalf("Error reading: %v", err)
}
}