Update flake and make nixpkgs a top-level input

.envrc

@@ -0,0 +1,2 @@
+use flake
+

.gitignore

@@ -1,3 +1,4 @@
 /target
 /.idea
 /.env
+/.direnv

Cargo.toml

@@ -6,9 +6,11 @@ edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-matrix-sdk = { version = "0.4.1", features = [ "encryption", "sled_cryptostore" ] }
-#monzo-lib = "0.4.0"
-monzo-lib = { git = "https://github.com/danieleades/monzo-lib.git", rev = "e54ff827" }
+# we use new features not quite yet in a released matrix rust SDK
+matrix-sdk = "0.5.0"
+#matrix-sdk = { git = "https://github.com/matrix-org/matrix-rust-sdk.git", rev = "a49a7fe1f93a4e8791dbbe4fd6876c587c33d2fa", features = ["encryption", "sled_cryptostore"] }
+monzo-lib = "0.4.4"
+#monzo-lib = { git = "https://github.com/danieleades/monzo-lib.git", rev = "e54ff827" }
 tokio = { version = "1.13.0", features = [ "full" ] }
 anyhow = "1.0.45"
 warp = "0.3.1"

flake.lock

@@ -0,0 +1,81 @@
+{
+  "nodes": {
+    "naersk": {
+      "inputs": {
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1698420672,
+        "narHash": "sha256-/TdeHMPRjjdJub7p7+w55vyABrsJlt5QkznPYy55vKA=",
+        "owner": "nix-community",
+        "repo": "naersk",
+        "rev": "aeb58d5e8faead8980a807c840232697982d47b9",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-community",
+        "repo": "naersk",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1714971268,
+        "narHash": "sha256-IKwMSwHj9+ec660l+I4tki/1NRoeGpyA2GdtdYpAgEw=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "27c13997bf450a01219899f5a83bd6ffbfc70d3c",
+        "type": "github"
+      },
+      "original": {
+        "id": "nixpkgs",
+        "ref": "nixos-23.11",
+        "type": "indirect"
+      }
+    },
+    "root": {
+      "inputs": {
+        "naersk": "naersk",
+        "nixpkgs": "nixpkgs",
+        "utils": "utils"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    },
+    "utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1694529238,
+        "narHash": "sha256-zsNZZGTGnMOf9YpHKJqMSsa0dXbfmxeoJ7xHlrt+xmY=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "ff7b65b44d01cf9ba6a71320833626af21126384",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,47 @@
+{
+  description = "Matrix Monzo bot";
+
+  inputs = {
+    nixpkgs.url = "nixpkgs/nixos-23.11";
+    utils.url = "github:numtide/flake-utils";
+    naersk = {
+      url = "github:nix-community/naersk";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+  };
+
+  outputs = { self, nixpkgs, utils, naersk }:
+    utils.lib.eachDefaultSystem (system: let
+      pkgs = nixpkgs.legacyPackages."${system}";
+      naersk-lib = naersk.lib."${system}";
+    in rec {
+      # `nix build`
+      packages.mxmonzo = naersk-lib.buildPackage {
+        pname = "mxmonzo";
+        root = ./.;
+
+        buildInputs = with pkgs; [
+          openssl
+          pkg-config
+        ];
+      };
+
+      defaultPackage = packages.mxmonzo;
+
+      # NixOS Modules
+      nixosModules = {
+        mxmonzo = import ./nixos_modules/mxmonzo.nix self;
+      };
+
+      # `nix run`
+      apps.mxmonzo = utils.lib.mkApp {
+        drv = packages.mxmonzo;
+      };
+      defaultApp = apps.mxmonzo;
+
+      # `nix develop`
+      devShell = pkgs.mkShell {
+        nativeBuildInputs = with pkgs; [ rustc cargo openssl pkg-config ];
+      };
+    });
+}

nixos_modules/mxmonzo.nix

@@ -0,0 +1,114 @@
+flake: {config, pkgs, lib, ...}:
+
+let
+  cfg = config.services.mxmonzo;
+  inherit (flake.packages.${pkgs.stdenv.hostPlatform.system}) mxmonzo;
+in
+
+with lib;
+
+{
+  options = {
+    services.mxmonzo = {
+      enable = mkOption {
+        default = false;
+        type = with types; bool;
+        description = ''
+          Start the Matrix Monzo bot.
+        '';
+      };
+
+      user = mkOption {
+        default = "mxmonzo";
+        type = with types; uniq str;
+        description = ''
+          Name of the user.
+        '';
+      };
+
+      matrixId = mkOption {
+        type = with types; str;
+        example = "@monzobot:librepush.net";
+        description = ''
+          Matrix ID of the Monzo bot user.
+        '';
+      };
+
+      bindAddress = mkOption {
+        default = "127.0.0.1:38320";
+        type = with types; str;
+        description = ''
+          Host:Port upon which to bind the web interface (used for OAuth + webhooks).
+        '';
+      };
+
+      externalBaseUri = mkOption {
+        example = "https://mxmonzo.my.librepush.net";
+        type = with types; str;
+        description = ''
+          External URL prefix to which this MxMonzo instance can be accessed (by webhooks).
+          It should be proxied to the HTTP interface listening on `bindAddress`.
+        '';
+      };
+
+      environmentFile = mkOption {
+        type = with types; path;
+        description = ''
+          File containing environment variables, especially:
+            - MATRIX_PASSWORD
+            - MONZO_CLIENT_ID
+            - MONZO_CLIENT_SECRET
+        '';
+      };
+
+      matrixRoom = mkOption {
+        type = with types; str;
+        description = ''
+          Room ID, like !roomid:librepush.net, of the bot's room to answer commands and emit notifications to.
+        '';
+      };
+
+      dataPath = mkOption {
+        type = with types; path;
+        description = ''
+          Path to where data can be kept.
+        '';
+      };
+    };
+  };
+
+  config = mkIf cfg.enable {
+    users.users."${cfg.user}" = {
+      description = "Matrix Monzo User";
+      isSystemUser = true;
+      group = "${cfg.user}";
+    };
+    users.groups."${cfg.user}" = {};
+
+    systemd.services.mxmonzo = {
+      wantedBy = [ "multi-user.target" ];
+      after = [ "network.target" ];
+      description = "Start the Matrix Monzo bot.";
+
+      environment = {
+        BIND_ADDRESS = cfg.bindAddress;
+        MATRIX_ID = cfg.matrixId;
+        MATRIX_ROOM = cfg.matrixRoom;
+        MATRIX_STORE = "${cfg.dataPath}/matrix-sdk";
+        MATRIX_PERSIST = "${cfg.dataPath}/matrix.json";
+        MONZO_PERSIST = "${cfg.dataPath}/monzo.json";
+        BASE_URI = cfg.externalBaseUri;
+      };
+
+      serviceConfig = {
+        Type = "simple";
+        User = "${cfg.user}";
+        ExecStart = ''${mxmonzo}/bin/mxmonzo'';
+
+        EnvironmentFile = [
+          cfg.environmentFile
+        ];
+      };
+    };
+  };
+}

src/main.rs

@@ -1,12 +1,15 @@
 use crate::monzo::monzo_client_freshened;
 use crate::state::{Config, MonzoState, State, StateInner};
 use crate::web::warp_main;
+use matrix_sdk::config::SyncSettings;
 use matrix_sdk::room::Room;
-use matrix_sdk::ruma::events::room::message::{MessageEventContent, MessageType};
-use matrix_sdk::ruma::events::SyncMessageEvent;
+use matrix_sdk::ruma::events::room::message::{MessageType, RoomMessageEventContent};
+use matrix_sdk::ruma::events::OriginalSyncMessageLikeEvent;
 use matrix_sdk::ruma::UserId;
-use matrix_sdk::{Client, ClientConfig, SyncSettings};
+use matrix_sdk::store::StateStore;
+use matrix_sdk::{Client, Session};
 use std::convert::TryFrom;
+use std::fs::File;
 use std::sync::Arc;
 use tokio::io::AsyncReadExt;
 use tokio::sync::RwLock;
@@ -16,7 +19,7 @@ pub mod state;
 pub mod web;
 
 async fn on_room_message(
-    event: &SyncMessageEvent<MessageEventContent>,
+    event: &OriginalSyncMessageLikeEvent<RoomMessageEventContent>,
     room: Room,
     state: &State,
 ) -> anyhow::Result<()> {
@@ -45,10 +48,10 @@ async fn on_room_message(
                             buf.push_str("?currency");
                         }
                     }
-                    let content = MessageEventContent::text_plain(&buf);
+                    let content = RoomMessageEventContent::text_plain(&buf);
                     room.send(content, None).await.unwrap();
                 } else {
-                    let content = MessageEventContent::text_plain("Not linked :(.");
+                    let content = RoomMessageEventContent::text_plain("Not linked :(.");
                     room.send(content, None).await.unwrap();
                 }
             }
@@ -64,12 +67,22 @@ async fn main() -> anyhow::Result<()> {
 
     let state_inner = StateInner::default();
 
-    let mxid = UserId::try_from(config.matrix_id.clone())?;
+    let mxid = <&UserId>::try_from(config.matrix_id.as_str())?;
     let store_path = config.matrix_store.clone();
 
-    let client_config = ClientConfig::new().store_path(store_path);
+    let state_store = Box::new(StateStore::open_with_path(store_path.join("state"))?);
 
-    let client = Client::new_from_user_id_with_config(mxid.clone(), client_config).await?;
+    let crypto_store = Box::new(matrix_sdk::store::CryptoStore::open_with_passphrase(
+        store_path.join("crypto"),
+        None,
+    )?);
+
+    let client = Client::builder()
+        .crypto_store(crypto_store)
+        .state_store(state_store)
+        .user_id(&mxid)
+        .build()
+        .await?;
 
     let state = State {
         config: Arc::new(config.clone()),
@@ -77,15 +90,24 @@ async fn main() -> anyhow::Result<()> {
         matrix_client: Arc::new(client.clone()),
     };
 
-    eprintln!("Logging in!");
-    client
-        .login(
-            mxid.localpart(),
-            &config.matrix_password,
-            Some("mxmonzo"),
-            Some("rei's MxMonzo"),
-        )
-        .await?;
+    if config.matrix_persist.exists() {
+        eprintln!("Restoring Matrix session...");
+        let session: Session = serde_json::from_reader(File::open(config.matrix_persist)?)?;
+        client.restore_login(session).await?;
+    } else {
+        eprintln!("Logging in!");
+        let session: Session = client
+            .login(
+                mxid.localpart(),
+                &config.matrix_password,
+                None,
+                Some("rei's MxMonzo"),
+            )
+            .await?
+            .into();
+        eprintln!("Persisting Matrix session...");
+        serde_json::to_writer(File::create(config.matrix_persist)?, &session)?;
+    }
 
     eprintln!("Syncing once!");
     client.sync_once(SyncSettings::new()).await?;
@@ -111,7 +133,7 @@ async fn main() -> anyhow::Result<()> {
 
     client
         .register_event_handler(
-            move |ev: SyncMessageEvent<MessageEventContent>, room: Room| {
+            move |ev: OriginalSyncMessageLikeEvent<RoomMessageEventContent>, room: Room| {
                 let state_arc = state_arc.clone();
                 async move {
                     if let Err(error) = on_room_message(&ev, room, &state_arc).await {

src/monzo.rs

@@ -73,7 +73,11 @@ pub async fn monzo_client_freshened(
     drop(state_inner);
     let needs_refresh = exp_at_instant < SystemTime::now();
     if needs_refresh {
-        eprintln!("Refreshing token; expiry {:?}; now {:?}.", exp_at_instant, SystemTime::now());
+        eprintln!(
+            "Refreshing token; expiry {:?}; now {:?}.",
+            exp_at_instant,
+            SystemTime::now()
+        );
         eprintln!("DEBUG refresh_token being used {:?}", &refresh_token);
         let client = reqwest::Client::new();
         let resp = client
@@ -87,8 +91,7 @@ pub async fn monzo_client_freshened(
             .send()
             .await?;
         eprintln!("DEBUG response status {:?}", resp.status());
-        let jv: serde_json::Value = resp.json()
-            .await?;
+        let jv: serde_json::Value = resp.json().await?;
         eprintln!("DEBUG raw JV {:#?}", jv);
         let auth_resp: MonzoAuthResponse = serde_json::from_value(jv)?;
         let mut state_inner = state.inner.write().await;

src/state.rs

@@ -19,6 +19,7 @@ pub struct Config {
     pub matrix_room: String,
     pub matrix_store: PathBuf,
     pub matrix_password: String,
+    pub matrix_persist: PathBuf,
     pub monzo_persist: PathBuf,
     pub monzo_client_id: String,
     pub monzo_client_secret: String,

src/web.rs

@@ -3,7 +3,7 @@ use crate::monzo::{
 };
 use crate::state::State;
 use matrix_sdk::room::Room;
-use matrix_sdk::ruma::events::room::message::MessageEventContent;
+use matrix_sdk::ruma::events::room::message::RoomMessageEventContent;
 use matrix_sdk::ruma::RoomId;
 use monzo::accounts::Type;
 use serde::Deserialize;
@@ -55,7 +55,7 @@ async fn auth_done(query: AuthDone, state: State) -> anyhow::Result<impl warp::R
 
     let _client = monzo_client_from_code(&state, &query.code).await?;
 
-    Ok("Success! Please authorise in Monzo, then click <a href='/auth_confirmed'>here</a>.")
+    Ok(warp::reply::html("Success! Please authorise in Monzo, then click <a href='/auth_confirmed'>here</a>."))
 }
 
 async fn auth_done_wrapped(
@@ -140,7 +140,7 @@ async fn monzo_hook(hook: MonzoHook, state: State) -> anyhow::Result<impl warp::
 
         let room = state
             .matrix_client
-            .get_room(&RoomId::from_str(&state.config.matrix_room)?)
+            .get_room(<&RoomId>::try_from(state.config.matrix_room.as_str())?)
             .ok_or_else(|| anyhow::anyhow!("Matrix room not found!"))?;
         if let Room::Joined(room) = room {
             let mut buf = String::new();
@@ -177,6 +177,8 @@ async fn monzo_hook(hook: MonzoHook, state: State) -> anyhow::Result<impl warp::
                 .unwrap_or("unk");
 
             buf.push_str(&format!(" on {}", on_account_name));
+            // MUST drop state_inner to avoid deadlock
+            drop(state_inner);
             if let Some(monzo_client) = monzo_client_freshened(&state).await? {
                 // include new balance
                 match monzo_client.balance(&txn_created.account_id).await {
@@ -191,10 +193,9 @@ async fn monzo_hook(hook: MonzoHook, state: State) -> anyhow::Result<impl warp::
                         eprintln!("when querying balance after webhook: {:?}", err);
                     }
                 }
-
             }
 
-            let content = MessageEventContent::text_plain(&buf);
+            let content = RoomMessageEventContent::text_plain(&buf);
             room.send(content, None).await.unwrap();
         } else {
             eprintln!("Not in room.");