feat: a CLI to send sms via twilio's API

I want to get an SMS when some of my machines are rebooted. This tool
let me do just that. The CLI takes as argument the path to a
configuration file that contains credentials to the API. It also has a
number of sub commands, and each sub command is associated with a
specific action.

For each action, a section in the configuration file is expected. The
two actions currently supported are:
- `reboot`
- `hello`

`hello` is a simple one used for testing, it sends "hello world".

`reboot` is used to create a message that contains the host's name and
the IP address of the network interface specified in the configuration
file.

1 files changed, 50 insertions, 1 deletions

diff --git a/src/main.rs b/src/main.rs
index e7a11a9..f6e4a37 100644..100755
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,3 +1,52 @@
+mod client;
+mod config;
+mod message;
+
+use clap::{crate_version, Parser};
+use std::path::PathBuf;
+use std::process::exit;
+
+#[derive(Parser, Debug)]
+#[clap(author, version, about, long_about = None)]
+#[clap(version = crate_version!())]
+struct Args {
+    #[clap(short, long, value_parser)]
+    config: PathBuf,
+
+    #[clap(subcommand)]
+    subcmd: message::MessageKind,
+}
+
+const TWILIO_BASE_URL: &str = "https://api.twilio.com";
+
 fn main() {
-    println!("Hello, world!");
+    let args = Args::parse();
+
+    let config: config::Config = match config::Config::load_from_file(&args.config) {
+        Ok(config) => config,
+        Err(e) => {
+            eprintln!("unable to load data from {}: {}", args.config.display(), e);
+            exit(1);
+        }
+    };
+
+    let msg = message::Message::builder()
+        .from(config.from.to_owned())
+        .to(config.to.to_owned())
+        .with_action(args.subcmd, &config)
+        .build();
+
+    let client = client::TwilioClient::new(
+        &config.account_sid,
+        &config.auth_token,
+        reqwest::Url::parse(TWILIO_BASE_URL).unwrap(),
+    );
+
+    match client.send(msg) {
+        Ok(m) => println!("message sent successfully: status is {:?}", m.status),
+        Err(error) => {
+            eprintln!("failed to send the message: {}", error);
+            exit(1);
+        }
+    }
 }