From 4094ece8038d60375e2c44d14e8f318477f08f9e Mon Sep 17 00:00:00 2001
From: Dimitrios Kouros <dimitris@kouros-online.de>
Date: Mon, 3 Aug 2026 07:23:58 +0300
Subject: [PATCH] first commit

---
 Cargo.lock   | 2516 ++++++++++++++++++++++++++++++++++++++++++++++++++
 Cargo.toml   |   11 +
 src/db.rs    |  132 +++
 src/email.rs |   71 ++
 src/main.rs  |   55 ++
 5 files changed, 2785 insertions(+)
 create mode 100644 Cargo.lock
 create mode 100644 Cargo.toml
 create mode 100644 src/db.rs
 create mode 100644 src/email.rs
 create mode 100644 src/main.rs

diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..b843157
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+ "stable_deref_trait",
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+ "zerofrom",
+]
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+ "proc-macro2",
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+ "syn 2.0.119",
+ "synstructure",
+]
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+ "synstructure",
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+ "proc-macro2",
+ "quote",
+ "syn 2.0.119",
+]
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..5dfaa75
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,11 @@
+[package]
+name = "messaging"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+dotenvy = "0.15.7"
+fcm-service = "0.2.3"
+lettre = { version = "0.11.22", default-features = false, features = ["builder", "smtp-transport", "tokio1-rustls-tls"] }
+mysql_async = "0.37.0"
+tokio = { version = "1.52.3" , features = ["rt", "rt-multi-thread", "macros"] }
diff --git a/src/db.rs b/src/db.rs
new file mode 100644
index 0000000..6a19f0e
--- /dev/null
+++ b/src/db.rs
@@ -0,0 +1,132 @@
+use mysql_async::prelude::*;
+use mysql_async::{Opts, OptsBuilder, Pool};
+
+#[derive(Debug, Clone)]
+#[allow(dead_code)]
+pub struct Device {
+    pub idtoken: i32,
+    pub device: Option<String>,
+    pub token: Option<String>,
+    pub active: Option<i8>,
+    pub pausefrom: Option<i32>,
+    pub pauseto: Option<i32>,
+}
+
+#[derive(Clone)]
+pub struct Db {
+    pool: Pool,
+}
+
+#[allow(dead_code)]
+impl Db {
+    /// Creates a new `Db` instance with a given database URL string.
+    pub fn new(database_url: &str) -> Self {
+        let opts = Opts::from_url(database_url).expect("Invalid database URL");
+        let pool = Pool::new(opts);
+        Self { pool }
+    }
+
+    /// Creates a `Db` instance by reading database configuration from environment variables:
+    /// - `DATABASE_URL` (if set)
+    /// - `DB_USER` (e.g. from .env)
+    /// - `DB_PASSWORD` (e.g. from .env)
+    /// - `DB_HOST` (e.g. "localhost:3306" from .env)
+    /// - `DB_NAME` (defaults to "places")
+    pub fn from_env() -> Self {
+        if let Ok(url) = std::env::var("DATABASE_URL") {
+            return Self::new(&url);
+        }
+
+        let user = std::env::var("DB_USER").unwrap_or_else(|_| "root".to_string());
+        let password = std::env::var("DB_PASSWORD").unwrap_or_else(|_| "delta32".to_string());
+        let host_str = std::env::var("DB_HOST").unwrap_or_else(|_| "127.0.0.1:3306".to_string());
+        let db_name = std::env::var("DB_NAME").unwrap_or_else(|_| "places".to_string());
+
+        let (host, port) = if let Some((h, p)) = host_str.split_once(':') {
+            (h.to_string(), p.parse::<u16>().unwrap_or(3306))
+        } else {
+            (host_str, 3306)
+        };
+
+        // If host is "localhost", use "127.0.0.1" for TCP socket connection
+        let host = if host == "localhost" {
+            "127.0.0.1".to_string()
+        } else {
+            host
+        };
+
+        let opts = Opts::from(
+            OptsBuilder::default()
+                .ip_or_hostname(host)
+                .tcp_port(port)
+                .user(Some(user))
+                .pass(Some(password))
+                .db_name(Some(db_name)),
+        );
+
+        let pool = Pool::new(opts);
+        Self { pool }
+    }
+
+    pub fn from_env_or_default() -> Self {
+        Self::from_env()
+    }
+
+    /// Retrieves the FCM token for a given device name (e.g. "Pixel 10").
+    pub async fn get_token_by_device(&self, device_name: &str) -> Result<Option<String>, mysql_async::Error> {
+        let mut conn = self.pool.get_conn().await?;
+        let token: Option<String> = conn
+            .exec_first(
+                "SELECT token FROM device WHERE device = :device_name LIMIT 1",
+                params! {
+                    "device_name" => device_name,
+                },
+            )
+            .await?;
+
+        Ok(token)
+    }
+
+    /// Retrieves full device details by device name.
+    pub async fn get_device_by_name(&self, device_name: &str) -> Result<Option<Device>, mysql_async::Error> {
+        let mut conn = self.pool.get_conn().await?;
+        let row: Option<(i32, Option<String>, Option<String>, Option<i8>, Option<i32>, Option<i32>)> = conn
+            .exec_first(
+                "SELECT idtoken, device, token, active, pausefrom, pauseto FROM device WHERE device = :device_name LIMIT 1",
+                params! {
+                    "device_name" => device_name,
+                },
+            )
+            .await?;
+
+        Ok(row.map(|(idtoken, device, token, active, pausefrom, pauseto)| Device {
+            idtoken,
+            device,
+            token,
+            active,
+            pausefrom,
+            pauseto,
+        }))
+    }
+
+    /// Retrieves all devices from the `device` table.
+    pub async fn get_all_devices(&self) -> Result<Vec<Device>, mysql_async::Error> {
+        let mut conn = self.pool.get_conn().await?;
+        let devices = conn
+            .exec_map(
+                "SELECT idtoken, device, token, active, pausefrom, pauseto FROM device",
+                (),
+                |(idtoken, device, token, active, pausefrom, pauseto)| Device {
+                    idtoken,
+                    device,
+                    token,
+                    active,
+                    pausefrom,
+                    pauseto,
+                },
+            )
+            .await?;
+
+        Ok(devices)
+    }
+}
diff --git a/src/email.rs b/src/email.rs
new file mode 100644
index 0000000..abec9ea
--- /dev/null
+++ b/src/email.rs
@@ -0,0 +1,71 @@
+use lettre::message::header::ContentType;
+use lettre::transport::smtp::authentication::Credentials;
+use lettre::{AsyncSmtpTransport, AsyncTransport, Message, Tokio1Executor};
+use std::error::Error;
+
+#[derive(Debug, Clone)]
+pub struct EmailService {
+    pub smtp_host: String,
+    pub smtp_port: u16,
+    pub email_address: String,
+    pub email_password: String,
+    pub recipient: String,
+}
+
+impl EmailService {
+    /// Reads email configuration from environment variables (.env):
+    /// - `EMAIL_ADDRESS` (required)
+    /// - `EMAIL_PASSWORD` (required)
+    /// - `SMTP_HOST` (defaults to mail.<domain> or localhost)
+    /// - `SMTP_PORT` (defaults to 587)
+    /// - `EMAIL_TO` (defaults to `EMAIL_ADDRESS`)
+    pub fn from_env() -> Option<Self> {
+        let email_address = std::env::var("EMAIL_ADDRESS").ok()?;
+        let email_password = std::env::var("EMAIL_PASSWORD").ok()?;
+
+        let domain = email_address.split('@').nth(1).unwrap_or("localhost");
+        let default_smtp_host = format!("mail.{}", domain);
+        let smtp_host = std::env::var("SMTP_HOST").unwrap_or(default_smtp_host);
+        let smtp_port = std::env::var("SMTP_PORT")
+            .ok()
+            .and_then(|p| p.parse::<u16>().ok())
+            .unwrap_or(587);
+        let recipient = std::env::var("EMAIL_TO").unwrap_or_else(|_| email_address.clone());
+
+        Some(Self {
+            smtp_host,
+            smtp_port,
+            email_address,
+            email_password,
+            recipient,
+        })
+    }
+
+    /// Sends an alert email when FCM notification delivery fails.
+    pub async fn send_fcm_failure_alert(
+        &self,
+        device_name: &str,
+        error_details: &str,
+    ) -> Result<(), Box<dyn Error + Send + Sync>> {
+        let email = Message::builder()
+            .from(self.email_address.parse()?)
+            .to(self.recipient.parse()?)
+            .subject(format!("[ALERT] FCM Notification Failed for {}", device_name))
+            .header(ContentType::TEXT_PLAIN)
+            .body(format!(
+                "FCM notification delivery failed.\n\nDevice: {}\nError: {}\n",
+                device_name, error_details
+            ))?;
+
+        let creds = Credentials::new(self.email_address.clone(), self.email_password.clone());
+
+        let mailer = AsyncSmtpTransport::<Tokio1Executor>::starttls_relay(&self.smtp_host)?
+            .port(self.smtp_port)
+            .credentials(creds)
+            .build();
+
+        mailer.send(email).await?;
+        println!("Alert email sent successfully to {}", self.recipient);
+        Ok(())
+    }
+}
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..c0b300a
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,55 @@
+mod db;
+mod email;
+
+use db::Db;
+use email::EmailService;
+use fcm_service::{FcmMessage, FcmNotification, FcmService, Target};
+
+#[tokio::main]
+async fn main() -> Result<(), Box<dyn std::error::Error>> {
+    dotenvy::dotenv().ok();
+
+    let db = Db::from_env();
+    let email_service = EmailService::from_env();
+
+    let device_name = "Pixel 10";
+
+    let token = match db.get_token_by_device(device_name).await? {
+        Some(token) => token,
+        None => {
+            let err_msg = format!("Device '{}' not found in database", device_name);
+            eprintln!("{}", err_msg);
+            if let Some(es) = &email_service {
+                if let Err(e) = es.send_fcm_failure_alert(device_name, &err_msg).await {
+                    eprintln!("Failed to send alert email: {}", e);
+                }
+            }
+            return Ok(());
+        }
+    };
+
+    println!("Fetched token for '{}': {}", device_name, token);
+
+    let service = FcmService::new("maps-32aa0-firebase-adminsdk-4qso4-74d42c4730.json");
+
+    let mut message = FcmMessage::new();
+    let mut notification = FcmNotification::new();
+    notification.set_title("Hello".to_string());
+    notification.set_body("World".to_string());
+    notification.set_image(None);
+    message.set_notification(Some(notification));
+    message.set_target(Target::Token(token));
+
+    if let Err(err) = service.send_notification(message).await {
+        eprintln!("FCM notification failed: {}", err);
+        if let Some(es) = &email_service {
+            if let Err(e) = es.send_fcm_failure_alert(device_name, &err.to_string()).await {
+                eprintln!("Failed to send alert email: {}", e);
+            }
+        }
+    } else {
+        println!("FCM notification sent successfully to '{}'", device_name);
+    }
+
+    Ok(())
+}