commit f81a036750af60c7d03f13eb7cfffd08628a984d
Author: Jan Christian Grünhage <jan.christian@gruenhage.xyz>
Date:   Sun Jul 24 15:03:39 2022 +0200

    initial commit

diff --git a/.gitignore b/.gitignore
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3f8f187641dad4f680d25c4bfc4225b418165984179f26ca76ec4fb6441d3a17"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+ "synstructure",
+]
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..5a0b739
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,14 @@
+[package]
+name = "matrix-example-bot"
+version = "0.1.0"
+edition = "2021"
+license-file = "LICENSE.md"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+anyhow = "1.0.58"
+dirs = "4.0.0"
+matrix-sdk = "0.5.0"
+tokio = { version = "1.20.0", features = ["rt-multi-thread", "macros"] }
+tracing-subscriber = "0.3.15"
diff --git a/LICENSE.md b/LICENSE.md
new file mode 100644
index 0000000..f76ea26
--- /dev/null
+++ b/LICENSE.md
@@ -0,0 +1,483 @@
+THE WORK (AS DEFINED BELOW) IS PROVIDED UNDER THE TERMS OF THIS
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diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..49c3315
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,135 @@
+use std::{env, process::exit, time::Duration};
+
+use matrix_sdk::{
+    config::SyncSettings,
+    room::Room,
+    ruma::events::room::{
+        member::StrippedRoomMemberEvent,
+        message::{
+            MessageType, OriginalSyncRoomMessageEvent, RoomMessageEventContent,
+            TextMessageEventContent,
+        },
+    },
+    store::StateStore,
+    Client,
+};
+use tokio::time::sleep;
+
+async fn on_room_message(event: OriginalSyncRoomMessageEvent, room: Room) {
+    if let Room::Joined(room) = room {
+        let msg_body = match event.content.msgtype {
+            MessageType::Text(TextMessageEventContent { body, .. }) => body,
+            _ => return,
+        };
+
+        if msg_body.contains("!party") {
+            let content = RoomMessageEventContent::text_plain("🎉🎊🥳 let's PARTY!! 🥳🎊🎉");
+
+            println!("sending");
+
+            // send our message to the room we found the "!party" command in
+            // the last parameter is an optional transaction id which we don't
+            // care about.
+            room.send(content, None).await.unwrap();
+
+            println!("message sent");
+        }
+    }
+}
+
+async fn on_stripped_state_member(
+    room_member: StrippedRoomMemberEvent,
+    client: Client,
+    room: Room,
+) {
+    if room_member.state_key != client.user_id().await.unwrap() {
+        return;
+    }
+
+    if let Room::Invited(room) = room {
+        println!("Autojoining room {}", room.room_id());
+        let mut delay = 2;
+
+        while let Err(err) = room.accept_invitation().await {
+            // retry autojoin due to synapse sending invites, before the
+            // invited user can join for more information see
+            // https://github.com/matrix-org/synapse/issues/4345
+            eprintln!(
+                "Failed to join room {} ({:?}), retrying in {}s",
+                room.room_id(),
+                err,
+                delay
+            );
+
+            sleep(Duration::from_secs(delay)).await;
+            delay *= 2;
+
+            if delay > 3600 {
+                eprintln!("Can't join room {} ({:?})", room.room_id(), err);
+                break;
+            }
+        }
+        println!("Successfully joined room {}", room.room_id());
+    }
+}
+
+async fn login_and_sync(
+    homeserver_url: String,
+    username: String,
+    password: String,
+) -> anyhow::Result<()> {
+    let mut client_builder = Client::builder().homeserver_url(homeserver_url);
+
+    // The location to save files to
+    let mut home = dirs::home_dir().expect("no home directory found");
+    home.push("party_bot");
+    let state_store = StateStore::open_with_path(home)?;
+    client_builder = client_builder.state_store(Box::new(state_store));
+
+    let client = client_builder.build().await.unwrap();
+    client
+        .login(&username, &password, None, Some("command bot"))
+        .await?;
+
+    println!("logged in as {}", username);
+
+    // An initial sync to set up state and so our bot doesn't respond to old
+    // messages. If the `StateStore` finds saved state in the location given the
+    // initial sync will be skipped in favor of loading state from the store
+    client.sync_once(SyncSettings::default()).await.unwrap();
+    // add our CommandBot to be notified of incoming messages, we do this after the
+    // initial sync to avoid responding to messages before the bot was running.
+    client.register_event_handler(on_room_message).await;
+    client
+        .register_event_handler(on_stripped_state_member)
+        .await;
+
+    // since we called `sync_once` before we entered our sync loop we must pass
+    // that sync token to `sync`
+    let settings = SyncSettings::default().token(client.sync_token().await.unwrap());
+    // this keeps state from the server streaming in to CommandBot via the
+    // EventHandler trait
+    client.sync(settings).await;
+
+    Ok(())
+}
+
+#[tokio::main]
+async fn main() -> anyhow::Result<()> {
+    tracing_subscriber::fmt::init();
+
+    let (homeserver_url, username, password) =
+        match (env::args().nth(1), env::args().nth(2), env::args().nth(3)) {
+            (Some(a), Some(b), Some(c)) => (a, b, c),
+            _ => {
+                eprintln!(
+                    "Usage: {} <homeserver_url> <username> <password>",
+                    env::args().next().unwrap()
+                );
+                exit(1)
+            }
+        };
+
+    login_and_sync(homeserver_url, username, password).await?;
+    Ok(())
+}