feat(api): config from env vars (HOST, PORT, CORS_ALLOWED_ORIGINS, DATABASE_URL)

crates/api/src/config.rs

@@ -0,0 +1,52 @@
+use std::env;
+
+#[derive(Debug)]
+pub struct Config {
+    pub database_url: String,
+    pub host: String,
+    pub port: u16,
+    /// Parsed CORS origin policy
+    pub cors_origins: CorsOrigins,
+}
+
+#[derive(Debug)]
+pub enum CorsOrigins {
+    /// Allow any origin (`CORS_ALLOWED_ORIGINS=*`)
+    Any,
+    /// Allow specific origins (`CORS_ALLOWED_ORIGINS=https://a.com,https://b.com`)
+    List(Vec<String>),
+}
+
+impl Config {
+    pub fn from_env() -> Self {
+        let database_url = env::var("DATABASE_URL")
+            .unwrap_or_else(|_| "sqlite://./pocket-chords.db".into());
+
+        let host = env::var("HOST").unwrap_or_else(|_| "0.0.0.0".into());
+
+        let port = env::var("PORT")
+            .ok()
+            .and_then(|v| v.parse::<u16>().ok())
+            .unwrap_or(8000);
+
+        let cors_origins = match env::var("CORS_ALLOWED_ORIGINS")
+            .unwrap_or_else(|_| "*".into())
+            .trim()
+            .to_string()
+        {
+            s if s == "*" => CorsOrigins::Any,
+            s => CorsOrigins::List(
+                s.split(',')
+                    .map(|o| o.trim().to_string())
+                    .filter(|o| !o.is_empty())
+                    .collect(),
+            ),
+        };
+
+        Self { database_url, host, port, cors_origins }
+    }
+
+    pub fn bind_addr(&self) -> String {
+        format!("{}:{}", self.host, self.port)
+    }
+}