Step by Step Guide to Building a JustCall API Integration in Go

Introduction

Hey there, fellow Go enthusiast! Ready to supercharge your communication stack with JustCall's powerful API? You're in the right place. This guide will walk you through integrating JustCall's API into your Go project, giving you the ability to make calls, send SMS, and manage contacts programmatically. Let's dive in!

Prerequisites

Before we start coding, make sure you've got:

• Go installed (I know, obvious, right?)
• JustCall API credentials (if you don't have these, hop over to JustCall's website and sign up)
• Your favorite code editor ready to rock

Setting up the project

Let's kick things off by creating a new Go project:

mkdir justcall-integration
cd justcall-integration
go mod init justcall-integration

Now, let's grab the packages we'll need:

go get github.com/go-resty/resty/v2

Authentication

JustCall uses API keys for authentication. Here's how to set it up:

package main

import (
    "github.com/go-resty/resty/v2"
)

const (
    baseURL = "https://api.justcall.io/v1"
    apiKey  = "your-api-key"
    secret  = "your-api-secret"
)

func main() {
    client := resty.New()
    client.SetBaseURL(baseURL)
    client.SetHeader("Authorization", "Bearer "+apiKey)
}

Making API requests

Now that we're authenticated, let's make some requests!

GET request

resp, err := client.R().
    SetQueryParam("limit", "10").
    Get("/contacts")

if err != nil {
    // Handle error
}

fmt.Println(resp.String())

POST request

resp, err := client.R().
    SetBody(map[string]interface{}{
        "phone": "+1234567890",
        "text":  "Hello from Go!",
    }).
    Post("/sms/send")

if err != nil {
    // Handle error
}

fmt.Println(resp.String())

Implementing key JustCall features

Making calls

resp, err := client.R().
    SetBody(map[string]interface{}{
        "from": "+1234567890",
        "to":   "+0987654321",
    }).
    Post("/calls/make")

Sending SMS

resp, err := client.R().
    SetBody(map[string]interface{}{
        "to":   "+0987654321",
        "text": "Hello from JustCall API!",
    }).
    Post("/sms/send")

Managing contacts

resp, err := client.R().
    SetBody(map[string]interface{}{
        "first_name": "John",
        "last_name":  "Doe",
        "phone":      "+1234567890",
    }).
    Post("/contacts")

Error handling and best practices

Always check for errors and handle them gracefully:

if err != nil {
    log.Printf("Error: %v", err)
    return
}

if resp.StatusCode() != 200 {
    log.Printf("Unexpected status code: %d", resp.StatusCode())
    return
}

Don't forget about rate limiting! JustCall has limits, so be a good API citizen and respect them.

Testing the integration

Here's a quick unit test example:

func TestSendSMS(t *testing.T) {
    // Mock the API call
    // Test the SendSMS function
    // Assert the results
}

For integration testing, consider using a staging environment if JustCall provides one.

Deployment considerations

When deploying, use environment variables for your API credentials:

apiKey := os.Getenv("JUSTCALL_API_KEY")
secret := os.Getenv("JUSTCALL_SECRET")

Never, ever commit your API credentials to version control. I'm serious!

Conclusion

And there you have it! You've just built a JustCall API integration in Go. Pretty cool, right? Remember, this is just scratching the surface. JustCall's API has a ton more features to explore.

Keep coding, keep learning, and most importantly, have fun with it! If you hit any snags, JustCall's documentation is your best friend. Now go forth and build something awesome!