Add Filesystem mail store and MultiDomain trait

src/mailstore/filesystem.rs

@@ -0,0 +1,100 @@
+use super::*;
+use std::{fs, io, os::unix::fs::DirBuilderExt, path::PathBuf};
+
+pub trait MultiDomain: MailStore {
+    type Error;
+    fn domains(&self) -> Result<Vec<String>, Self::Error>;
+    fn add_domain(&mut self, domain: &str) -> Result<(), Self::Error>;
+    fn remove_domain(&mut self, domain: &str) -> Result<(), Self::Error>;
+}
+
+#[derive(Clone, Debug)]
+#[cfg_attr(feature = "serde", derive(Deserialize, Serialize))]
+pub struct Filesystem {
+    pub path: PathBuf,
+}
+
+impl MailStore for Filesystem {
+    fn users(&self) -> Vec<Mailuser> {
+        todo!()
+    }
+
+    fn serves_domain(&self, domain: &str) -> bool {
+        let mut path = self.path.clone();
+        path.push(domain);
+        path.exists()
+    }
+
+    fn has_mailuser(&self, mailuser: &str) -> bool {
+        if let Some((user, host)) = mailuser.rsplit_once('@') {
+            let mut path = self.path.clone();
+            if host.contains('.') && !host.contains(|c: char| c.is_whitespace()) {
+                path.push(host);
+                path.push(user);
+                return path.exists();
+            }
+        }
+        false
+    }
+
+    fn get_user_messages(&self, user: &str) -> Option<BTreeMap<String, Message>> {
+        todo!()
+    }
+
+    fn get_message(&self, user: &str, title: &str) -> Option<Message> {
+        todo!()
+    }
+
+    fn move_message(&mut self, user: &str, title: &str, folder: &str) {
+        todo!()
+    }
+
+    fn add_user(&mut self, user: &str) -> Result<(), ParseMailboxError> {
+        todo!()
+    }
+
+    fn remove_user(&mut self, user: &str) -> bool {
+        todo!()
+    }
+}
+
+impl MultiDomain for Filesystem {
+    type Error = io::Error;
+
+    fn domains(&self) -> Result<Vec<String>, Self::Error> {
+        Ok(self
+            .path
+            .read_dir()?
+            .filter(|x| {
+                if let Ok(x) = x {
+                    if let Ok(t) = x.file_type() {
+                        return t.is_dir();
+                    }
+                }
+                false
+            })
+            .map(|x| x.unwrap().file_name().to_string_lossy().to_string())
+            .collect::<Vec<String>>())
+    }
+
+    fn add_domain(&mut self, domain: &str) -> Result<(), Self::Error> {
+        let mut path = self.path.clone();
+        path.push(domain);
+        if !path.exists() {
+            fs::DirBuilder::new()
+                .recursive(true)
+                .mode(700)
+                .create(path)?;
+        }
+        Ok(())
+    }
+
+    fn remove_domain(&mut self, domain: &str) -> Result<(), Self::Error> {
+        let mut path = self.path.clone();
+        path.push(domain);
+        if path.exists() {
+            fs::remove_dir_all(path)?;
+        }
+        Ok(())
+    }
+}

src/mailstore/mod.rs

@@ -7,6 +7,8 @@ use std::{
 #[cfg(feature = "serde")]
 use serde::{Deserialize, Serialize};
 
+pub mod filesystem;
+
 pub trait MailStore {
     /// Retreives a list of all valid mailusers on this server
     fn users(&self) -> Vec<Mailuser>;
@@ -19,6 +21,8 @@ pub trait MailStore {
     /// Checks whether this server has a message with the given title for this user and if so
     /// returns the message
     fn get_message(&self, user: &str, title: &str) -> Option<Message>;
+    /// Move a message to a new folder
+    fn move_message(&mut self, user: &str, title: &str, folder: &str);
     /// Adds a new mailuser to the given domain
     fn add_user(&mut self, user: &str) -> Result<(), ParseMailboxError>;
     /// Removes the given user if the account exists
@@ -80,6 +84,10 @@ impl MailStore for Domain {
             .cloned()
     }
 
+    fn move_message(&mut self, user: &str, title: &str, folder: &str) {
+        todo!()
+    }
+
     fn add_user(&mut self, user: &str) -> Result<(), ParseMailboxError> {
         if self.users.contains_key(user) {
             return Ok(());