Add config.rs

src/config.rs

@@ -0,0 +1,43 @@
+use serde::Deserialize;
+use std::env;
+use std::fs::File;
+use std::io::BufReader;
+
+#[derive(Deserialize)]
+pub struct EmailServer {
+    pub server_name: String,
+    pub email: String,
+    pub password: String,
+}
+
+#[derive(Deserialize)]
+pub struct Address {
+    pub name: String,
+    pub user: String,
+    pub domain: String,
+}
+
+#[derive(Deserialize)]
+pub struct Config {
+    pub path_prefix: String,
+    pub email_server: EmailServer,
+    pub email_from: Address,
+    pub email_to: Address,
+}
+
+impl Config {
+    pub fn new() -> Self {
+        let config_file_var = "CF_CONFIG_FILE";
+        let config_path = env::var(config_file_var)
+            .unwrap_or_else(|_| panic!("Environment variable {config_file_var} missing!"));
+
+        let config_file = File::open(&config_path).unwrap_or_else(|e| {
+            panic!("Can not open the config file at the path {config_path}: {e}")
+        });
+        let config_reader = BufReader::new(config_file);
+        let config: Self =
+            serde_json::from_reader(config_reader).expect("Can not parse the config file as JSON!");
+
+        config
+    }
+}