tweet_client.go

package main

import (
	"bufio"
	"log"
	"os"
	"unicode/utf8"

	"github.com/dghubble/go-twitter/twitter"
	"github.com/dghubble/oauth1"
)

type Credentials struct {
	ConsumerKey       string
	ConsumerSecret    string
	AccessToken       string
	AccessTokenSecret string
}

func main() {
	creds := Credentials{
		AccessToken:       os.Getenv("TWITTER_ACCESS_TOKEN"),
		AccessTokenSecret: os.Getenv("TWITTER_ACCESS_TOKEN_SECRET"),
		ConsumerKey:       os.Getenv("TWITTER_CONSUMER_KEY"),
		ConsumerSecret:    os.Getenv("TWITTER_CONSUMER_KEY_SECRET"),
	}

	client, err := getClient(&creds)
	if err != nil {
		log.Println("Error getting Twitter Client")
		log.Println(err)
		os.Exit(-1)
	}

	// Say something
	println("What's up?")
	tweetContent := getUserInput()

	// Send a Tweet
	_, _, err = client.Statuses.Update(tweetContent, nil)
	if err != nil {
		log.Println("Error getting Twitter Client")
		log.Println(err)
		os.Exit(-1)
	} else {
		println("->Woosh")
	}
}

func getUserInput() string {
	// Note hard coded input buffer in the kernel of 1024 bytes. If your input goes beyond program is unresponsive.
	scanner := bufio.NewScanner(os.Stdin)
	scanner.Scan()
	userInput := scanner.Text()

	if utf8.RuneCountInString(userInput) > 256 {
		println("Over char limit")
		getUserInput()
	}
	return userInput
}

func getClient(creds *Credentials) (*twitter.Client, error) {
	// Pass in your consumer key (API Key) and your Consumer Secret (API Secret)
	config := oauth1.NewConfig(creds.ConsumerKey, creds.ConsumerSecret)
	// Pass in your Access Token and your Access Token Secret
	token := oauth1.NewToken(creds.AccessToken, creds.AccessTokenSecret)

	httpClient := config.Client(oauth1.NoContext, token)
	client := twitter.NewClient(httpClient)

	// Verify Credentials
	verifyParams := &twitter.AccountVerifyParams{
		SkipStatus:   twitter.Bool(true),
		IncludeEmail: twitter.Bool(true),
	}

	// we can retrieve the user and verify if the credentials
	// we have used successfully allow us to log in!
	_, _, err := client.Accounts.VerifyCredentials(verifyParams)
	if err != nil {
		return nil, err
	}
	return client, nil
}