feat(config): connection_uri_file added to config

src/core/config/check.rs

@@ -1,4 +1,4 @@
-use std::env::consts::OS;
+use std::{env::consts::OS, path::PathBuf};
 
 use either::Either;
 use figment::Figment;
@@ -263,6 +263,18 @@ pub fn check(config: &Config) -> Result {
 		));
 	}
 
+	if config.smtp.as_ref().is_some_and(|f| {
+		f.connection_uri.is_none() && f.connection_uri_file.is_none()
+			|| (f.connection_uri == Some(String::new())
+				&& f.connection_uri_file == Some(PathBuf::new()))
+	}) {
+		return Err!(Config(
+			"connection_uri",
+			"If smtp is enabled, either connection_uri or connection_uri_file have to be \
+			 defined."
+		));
+	}
+
 	match (&config.default_room_acl_allow, &config.default_room_acl_deny) {
 		| (Some(_), Some(_)) => {
 			return Err!(Config(

src/core/config/mod.rs

@@ -2589,7 +2589,11 @@ pub struct SmtpConfig {
 	///
 	/// For a guide on the accepted URI syntax, consult Lettre's documentation:
 	/// https://docs.rs/lettre/latest/lettre/transport/smtp/struct.AsyncSmtpTransport.html#method.from_url
-	pub connection_uri: String,
+	pub connection_uri: Option<String>,
+
+	/// Same as `connection_uri`, except loaded from a file. If `connection_uri`
+	/// is defined, it is prioritized and `connection_uri_file` is ignored
+	pub connection_uri_file: Option<PathBuf>,
 
 	/// The outgoing address which will be used for sending emails.
 	///