This tutorial will use the TextBelt SMS service. Sign up and get an API key in order to make this fully work.
Create Project and go into that directory
mix phx.new sms_demo --no-ecto
cd sms_demo
Add HTTPoison and Poison dependencies to the project
#Path mix.exs
defp deps do
[
...
{:poison, "~> 4.0"},
{:httpoison, "~> 1.8"},
...
Get dependencies again
mix deps.get
Create Handler for SMS sending / receiving
# Path: lib/sms_demo/sms_handler.ex
defmodule SmsDemo.SmsHandler do
use GenServer
def send_message(to_phone, message) do
GenServer.cast(SmsDemo.SmsHandler, {:send, {to_phone, message}})
end
def receive_message(from_phone, message) do
GenServer.cast(SmsDemo.SmsHandler, {:receive, {from_phone, message}})
end
def start_link(_) do
GenServer.start_link(__MODULE__, [], name: __MODULE__)
end
def init([]) do
{:ok, %{}}
end
def handle_cast({:send, {phone, message}}, state) do
textbelt_url = "https://textbelt.com/text"
textbelt_key = Application.get_env(:sms_demo, :textbelt_key)
replyWebhookUrl = Application.get_env(:sms_demo, :webhook_url)
params = %{
phone: phone,
message: message,
key: textbelt_key,
replyWebhookUrl: replyWebhookUrl
}
HTTPoison.post(textbelt_url,
Poison.encode!(params),
[{"Content-type", "application/json"}])
{:noreply, state}
end
def handle_cast({:receive, {phone, message}}, state) do
# TODO: Do something with the message
{:noreply, state}
end
end
Update Application defintion to spawn the above Handler
# Path: lib/sms_demo/application.ex
def start(_type, _args) do
children = [
...
SmsDemo.SmsHandler,
...
Add WebHook Controller
# Path: lib/sms_demo_web/controllers/webhook_controller.ex
defmodule SmsDemoWeb.WebhookController do
alias SmsDemo.SmsHandler
use SmsDemoWeb, :controller
def hook(conn, params) do
SmsHandler.receive_message(params["fromNumber"], params["text"])
json(conn, %{status: "ok"})
end
end
Uncomment the /api scope in Router and add our hook
# Path: lib/sms_demo_web/router.ex
scope "/api", SmsDemoWeb do
pipe_through :api
post "/hook", WebhookController, :hook
end
Test Webhook locally
$ mix phx.server
$ curl -X POST http://localhost:4000/api/hook \
-H 'Content-Type: application/json' \
-d '{"fromNumber": "+1555123456", "text": "Here is my reply"}'
That's all the plumbing. Now we can make a little joke telling interaction in which we want to:
1. Hit a web endpoint api and pass in a phone number to tell a joke to
2. Send via SMS the first part of the joke
3. Expect an SMS response of "Why?"
4. Send via SMS the second part of the joke
Check out the finished project on github at
https://github.com/byronsalty/sms_demo
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