Use environment variables instead of config file

1 files changed, 38 insertions, 4 deletions

diff --git a/src/model/config.rs b/src/model/config.rs
index e69b4c4..1fa5bb4 100644
--- a/src/model/config.rs
+++ b/src/model/config.rs
@@ -1,8 +1,42 @@
-use serde::Deserialize;
+use std::env;
+use std::net::SocketAddr;
+use std::str::FromStr;
 
-#[derive(Clone, Deserialize)]
+#[derive(Clone)]
 pub struct Config {
-    pub secure_cookies: bool,
-    pub mock_mails: bool,
     pub auth_secret: String,
+    pub db_path: String,
+    pub mock_mails: bool,
+    pub secure_cookies: bool,
+    pub socket_address: SocketAddr,
+}
+
+pub fn from_env() -> Result<Config, String> {
+    Ok(Config {
+        auth_secret: read_string("AUTH_SECRET")?,
+        db_path: read_string("DB_PATH")?,
+        mock_mails: read_bool("MOCK_MAILS")?,
+        secure_cookies: read_bool("SECURE_COOKIES")?,
+        socket_address: read_socket_address("SOCKET_ADDRESS")?,
+    })
+}
+
+fn read_socket_address(key: &str) -> Result<SocketAddr, String> {
+    SocketAddr::from_str(&read_string(key)?).map_err(|err| {
+        format!("environment variable '{key}' is not a socket address: {err}")
+    })
+}
+
+fn read_bool(key: &str) -> Result<bool, String> {
+    read_string(key).and_then(|v| match v.as_str() {
+        "true" => Ok(true),
+        "false" => Ok(false),
+        _ => Err(format!(
+            "environment variable '{key}' is not a boolean: '{v}'"
+        )),
+    })
+}
+
+fn read_string(key: &str) -> Result<String, String> {
+    env::var(key).map_err(|_| format!("missing environment variable '{key}'"))
 }