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pushbullet.go
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pushbullet.go
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package main
import (
"context"
"encoding/json"
"fmt"
"io"
"io/ioutil"
"net/http"
"net/url"
"os"
"time"
"github.com/andrew-d/go-termutil"
api "github.com/mitsuse/pushbullet-go"
req "github.com/mitsuse/pushbullet-go/requests"
"github.com/pkg/browser"
"github.com/shu-go/minredir"
)
var (
pushbulletOAuth2ClientID string = ""
pushbulletOAuth2ClientSecret string = ""
)
type pbCmd struct {
_ struct{} `help:"notify by Pushbullet"`
Send pbSendCmd `help:"send a notification"`
Auth pbAuthCmd
}
type pbSendCmd struct {
Title string `default:"xn" help:"title"`
Body string `help:"body"`
}
type pbAuthCmd struct {
_ struct{} `help:"authenticate" usage:"1. go to https://www.pushbullet.com/#settings/clients\n2. make a new OAuth Client\n3. xn pushbullet auth CLIENT_ID CLIENT_SECRET"`
Port int `cli:"port=PORT" default:"7878" help:"a temporal PORT for OAuth authentication."`
Timeout int `cli:"timeout=TIMEOUT" default:"60" help:"set TIMEOUT (in seconds) on authentication transaction. < 0 is infinite."`
}
func (c pbSendCmd) Run(global globalCmd, args []string) error {
config, _ := loadConfig(global.Config)
if config.Pushbullet.AccessToken == "" {
return fmt.Errorf("auth first")
}
//
// prepare
//
for _, v := range args {
if len(c.Body) > 0 {
c.Body += "\n"
}
c.Body += v
}
if !termutil.Isatty(os.Stdin.Fd()) {
bytes, err := ioutil.ReadAll(os.Stdin)
if err != nil {
bytes = []byte{}
}
if len(c.Body) == 0 {
c.Body = string(bytes)
} else if len(bytes) != 0 {
c.Body += "\n" + string(bytes)
}
}
if len(c.Body) == 0 {
return nil
}
pb := api.New(config.Pushbullet.AccessToken)
n := req.NewNote()
n.Title = c.Title
n.Body = c.Body
if _, err := pb.PostPushesNote(n); err != nil {
return err
}
return nil
}
func (c pbAuthCmd) Run(global globalCmd, args []string) error {
config, _ := loadConfig(global.Config)
var argClientID, argCLientSecret string
if len(args) >= 2 {
argClientID = args[0]
argCLientSecret = args[1]
}
//
// prepare
//
pushbulletOAuth2ClientID = firstNonEmpty(
argClientID,
config.Pushbullet.ClientID,
os.Getenv("PUSHBULLET_OAUTH2_CLIENT_ID"),
pushbulletOAuth2ClientID)
pushbulletOAuth2ClientSecret = firstNonEmpty(
argCLientSecret,
config.Pushbullet.ClientSecret,
os.Getenv("PUSHBULLET_OAUTH2_CLIENT_SECRET"),
pushbulletOAuth2ClientSecret)
if pushbulletOAuth2ClientID == "" || pushbulletOAuth2ClientSecret == "" {
fmt.Fprintf(os.Stderr, "both PUSHBULLET_OAUTH2_CLIENT_ID and PUSHBULLET_OAUTH2_CLIENT_SECRET must be given.\n")
fmt.Fprintf(os.Stderr, "access to https://www.pushbullet.com/#settings/clients\n")
browser.OpenURL("https://www.pushbullet.com/#settings/clients")
return nil
}
redirectURI := fmt.Sprintf("https://localhost:%d/", c.Port)
//
// fetch the authentication code
//
authURI := pushbulletAuthURI(pushbulletOAuth2ClientID, redirectURI)
if err := browser.OpenURL(authURI); err != nil {
return fmt.Errorf("failed to open the authURI(%s): %v", authURI, err)
}
resultChan := make(chan string)
ctx, cancel := context.WithTimeout(context.Background(), time.Duration(c.Timeout)*time.Second)
err, errChan := minredir.ServeTLS(ctx, fmt.Sprintf(":%v", c.Port), resultChan)
authCode := waitForStringChan(resultChan, time.Duration(c.Timeout)*time.Second)
cancel()
if authCode == "" {
select {
case err = <-errChan:
default:
err = nil
}
return fmt.Errorf("failed or timed out fetching an authentication code: %w", err)
}
//
// fetch the refresh token
//
accessToken, err := pushbulletFetchAccessToken(pushbulletOAuth2ClientID, pushbulletOAuth2ClientSecret, authCode)
if err != nil {
return fmt.Errorf("failed or timed out fetching the access token: %v", err)
}
//
// store the token to the config file.
//
config.Pushbullet.AccessToken = accessToken
saveConfig(config, global.Config)
return nil
}
func init() {
appendCommand(&pbCmd{}, "pushbullet, pb", "")
}
////////////////////////////////////////////////////////////////////////////////
func pushbulletAuthURI(clientID, redirectURI string) string {
const (
oauth2AuthBaseURL = "https://www.pushbullet.com/authorize"
)
form := url.Values{}
form.Add("client_id", clientID)
form.Add("redirect_uri", redirectURI)
form.Add("response_type", "code")
return fmt.Sprintf("%s?%s", oauth2AuthBaseURL, form.Encode())
}
func pushbulletFetchAccessToken(clientID, clientSecret, authCode string) (string, error) {
const (
oauth2TokenBaseURL = "https://api.pushbullet.com/oauth2/token"
)
form := url.Values{}
form.Add("grant_type", "authorization_code")
form.Add("client_id", clientID)
form.Add("client_secret", clientSecret)
form.Add("code", authCode)
resp, err := http.PostForm(oauth2TokenBaseURL, form)
if err != nil {
return "", err
}
defer resp.Body.Close()
dec := json.NewDecoder(resp.Body)
t := oauth2AuthedTokens{}
err = dec.Decode(&t)
if err == io.EOF {
return "", fmt.Errorf("auth response from the server is empty")
} else if err != nil {
return "", err
}
return t.AccessToken, nil
}
type oauth2AuthedTokens struct {
AccessToken string `json:"access_token"`
}