feat(tool/sendsms): a CLI to send SMS

This is a new tool to send SMS via Twilio's API. For now it supports a
single subcommand: reboot. Using that subcommand, a SMS will be send
with the name of the host and the IP address for the defined network
interface. This is useful to be notified when one of my machine reboot,
and what's the IP for the main interface (this is useful since my ISP
does not provide a static IP).

Change-Id: I5886a2c77ebd344ab3befa51a6bdd3d65bcc85d4

6 files changed, 1382 insertions, 0 deletions

diff --git a/tools/sendsms/Cargo.lock b/tools/sendsms/Cargo.lock
new file mode 100644
index 0000000..365149b
--- /dev/null
+++ b/tools/sendsms/Cargo.lock
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+serde_json = "1.0.85"
+toml = "0.5.9"
diff --git a/tools/sendsms/README.org b/tools/sendsms/README.org
new file mode 100644
index 0000000..8f3ffdd
--- /dev/null
+++ b/tools/sendsms/README.org
@@ -0,0 +1,8 @@
+#+TITLE: sendsms
+
+A CLI to send SMS via [[https://console.twilio.com][twilio's API]].
+
+** Usage
+The tool supports subcommands, which are profiles with predefined messages.
+
+For example, you can write a systemd unit that is triggered after a reboot to send an SMS with =sendsms reboot=. The SMS will contain the hostname and IP of a predefined interface.
diff --git a/tools/sendsms/src/config.rs b/tools/sendsms/src/config.rs
new file mode 100644
index 0000000..da9435a
--- /dev/null
+++ b/tools/sendsms/src/config.rs
@@ -0,0 +1,23 @@
+use serde::Deserialize;
+use std::path::PathBuf;
+
+#[derive(Deserialize, Debug)]
+pub struct Config {
+    pub to: String,
+    pub from: String,
+    pub account_sid: String,
+    pub auth_token: String,
+    pub reboot: RebootConfig,
+}
+
+#[derive(Deserialize, Debug)]
+pub struct RebootConfig {
+    pub ifname: String,
+}
+
+impl Config {
+    pub fn load_from_file(filename: &PathBuf) -> std::io::Result<Config> {
+        let content = std::fs::read_to_string(filename)?;
+        Ok(toml::from_str(&content)?)
+    }
+}
diff --git a/tools/sendsms/src/main.rs b/tools/sendsms/src/main.rs
new file mode 100755
index 0000000..30e92ff
--- /dev/null
+++ b/tools/sendsms/src/main.rs
@@ -0,0 +1,85 @@
+#![warn(rust_2018_idioms)]
+
+mod config;
+mod message;
+
+use clap::{crate_version, Parser};
+use gethostname::gethostname;
+use log::{error, info};
+use std::net::IpAddr;
+use std::path::PathBuf;
+use std::process::exit;
+
+#[derive(Parser, Debug)]
+#[clap(name = "sendsms")]
+#[clap(author = "Franck Cuny <franck@fcuny.net>")]
+#[clap(version = crate_version!())]
+#[clap(propagate_version = true)]
+struct Args {
+    #[clap(short, long, value_parser)]
+    config: PathBuf,
+
+    #[clap(subcommand)]
+    subcmd: SubCommand,
+}
+
+#[derive(Parser, Debug)]
+enum SubCommand {
+    Reboot,
+}
+
+fn main() {
+    env_logger::init();
+    let args = Args::parse();
+
+    let config: config::Config = match config::Config::load_from_file(&args.config) {
+        Ok(r) => r,
+        Err(e) => {
+            error!(
+                "unable to load data from {}: {}",
+                args.config.display(),
+                e.to_string()
+            );
+            exit(1);
+        }
+    };
+
+    let body = match args.subcmd {
+        SubCommand::Reboot => reboot(&config.reboot),
+    };
+
+    let msg = message::Message {
+        from: config.from.to_owned(),
+        to: config.to.to_owned(),
+        body,
+    };
+
+    match msg.send(&config) {
+        Ok(_) => info!("message sent successfully"),
+        Err(error) => {
+            error!("failed to send the message: {}", error);
+            exit(1);
+        }
+    }
+}
+
+fn reboot(config: &config::RebootConfig) -> String {
+    let ipaddr_v4 = if_addrs::get_if_addrs()
+        .unwrap_or_default()
+        .into_iter()
+        .find(|iface| iface.name == config.ifname)
+        .and_then(|iface| match iface.ip() {
+            IpAddr::V4(addr) => Some(addr),
+            IpAddr::V6(_) => None,
+        })
+        .expect("there should be an ipv4 address");
+
+    let hostname = gethostname()
+        .into_string()
+        .expect("failed to get the hostname");
+
+    format!(
+        "{} has rebooted. The IP address for the interface {} is {}.",
+        hostname, config.ifname, ipaddr_v4
+    )
+}
diff --git a/tools/sendsms/src/message.rs b/tools/sendsms/src/message.rs
new file mode 100755
index 0000000..9aa94a4
--- /dev/null
+++ b/tools/sendsms/src/message.rs
@@ -0,0 +1,76 @@
+use crate::config::Config;
+use reqwest::blocking::Client;
+use serde::Deserialize;
+use std::collections::HashMap;
+use std::fmt::{self, Display, Formatter};
+
+const TWILIO_BASE_URL: &str = "https://api.twilio.com/2010-04-01/Accounts";
+
+#[derive(Deserialize, Debug)]
+pub struct Message {
+    pub from: String,
+    pub to: String,
+    pub body: String,
+}
+
+// list of possible values: https://www.twilio.com/docs/sms/api/message-resource#message-status-values
+#[derive(Debug, Deserialize, Clone)]
+#[allow(non_camel_case_types)]
+pub enum MessageStatus {
+    accepted,
+    scheduled,
+    queued,
+    sending,
+    sent,
+    receiving,
+    received,
+    delivered,
+    undelivered,
+    failed,
+    read,
+    canceled,
+}
+
+#[derive(Deserialize, Debug, Clone)]
+pub struct MessageResponse {
+    pub status: Option<MessageStatus>,
+}
+
+#[derive(Debug)]
+pub enum TwilioError {
+    HTTPError(reqwest::StatusCode),
+}
+
+impl Display for TwilioError {
+    fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
+        match *self {
+            TwilioError::HTTPError(ref s) => write!(f, "Invalid HTTP status code: {}", s),
+        }
+    }
+}
+
+impl Message {
+    pub fn send(&self, config: &Config) -> Result<MessageResponse, TwilioError> {
+        let url = format!("{}/{}/Messages.json", TWILIO_BASE_URL, config.account_sid);
+
+        let mut form = HashMap::new();
+        form.insert("From", &self.from);
+        form.insert("To", &self.to);
+        form.insert("Body", &self.body);
+
+        let client = Client::new();
+        let response = client
+            .post(url)
+            .basic_auth(&config.account_sid, Some(&config.auth_token))
+            .form(&form)
+            .send()
+            .unwrap();
+
+        match response.status() {
+            reqwest::StatusCode::CREATED | reqwest::StatusCode::OK => {}
+            other => return Err(TwilioError::HTTPError(other)),
+        };
+
+        Ok(response.json().unwrap())
+    }
+}