Implemented mail notifications.

src/error.rs

@@ -8,7 +8,9 @@ pub enum AppError {
     HourParseError,
     ServerError(String),
     FatalError(String),
-    SlotParseError
+    SlotParseError,
+    MailAddrParseErr(String),
+    MailSendError(String)
 }
 
 impl AppError {
@@ -17,7 +19,9 @@ impl AppError {
             AppError::HourParseError => {"Hour parse error".to_string()},
             AppError::ServerError(e) => {format!("Server error: {}", e)},
             AppError::FatalError(e) => {format!("Fatal error: {}", e)},
-            AppError::SlotParseError => {"Book slot parse error".to_string()}
+            AppError::SlotParseError => {"Book slot parse error".to_string()},
+            AppError::MailAddrParseErr(e) => {format!("Cannot parse email address: {}", e)},
+            AppError::MailSendError(e) => {format!("Cannot send email: {}", e)}
         }
     }
 }
@@ -48,3 +52,31 @@ impl From<ParseError> for AppError {
         AppError::HourParseError
     }
 }
+
+#[cfg(feature = "ssr")]
+impl From<lettre::address::AddressError> for AppError {
+    fn from(value: lettre::address::AddressError) -> Self {
+        AppError::MailAddrParseErr(value.to_string())
+    }
+}
+
+#[cfg(feature = "ssr")]
+impl From<lettre::error::Error> for AppError {
+    fn from(value: lettre::error::Error) -> Self {
+        AppError::MailSendError(value.to_string())
+    }
+}
+
+#[cfg(feature = "ssr")]
+impl From<lettre::transport::smtp::Error> for AppError {
+    fn from(value: lettre::transport::smtp::Error) -> Self {
+        AppError::MailSendError(value.to_string())
+    }
+}
+
+#[cfg(feature = "ssr")]
+impl From<lettre::transport::file::Error> for AppError {
+    fn from(value: lettre::transport::file::Error) -> Self {
+        AppError::MailSendError(value.to_string())
+    }
+}