commit 5c61e9df963c1106ea1c284efea42ec5e925a7b1
Author: NGnius (Graham) <ngniusness@gmail.com>
Date:   Mon Feb 22 16:08:37 2021 -0500

    Initial Discord Slash Command functionality

diff --git a/.gitignore b/.gitignore
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index 0000000..d81f12e
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+++ b/.gitignore
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diff --git a/Cargo.lock b/Cargo.lock
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+ "zeroize_derive",
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+ "proc-macro2 1.0.24",
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+]
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..8e5d3f8
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,21 @@
+[package]
+name = "leo2"
+version = "0.1.0"
+authors = ["NGnius (Graham) <ngniusness@gmail.com>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+rocket = "0.4.7"
+reqwest = { version = "0.11.1", features = ["json", "blocking"]}
+ed25519-dalek = "1.0.1"
+lazy_static = "1.4.0"
+serde = { version = "1.0", features = ["derive"] }
+serde_json = { version = "1.0" }
+hex = "0.4.2"
+# futures = "0.3.12"
+
+[dependencies.rocket_contrib]
+default-features = false
+features = ["json"]
\ No newline at end of file
diff --git a/src/auth_tools.rs b/src/auth_tools.rs
new file mode 100644
index 0000000..281cc92
--- /dev/null
+++ b/src/auth_tools.rs
@@ -0,0 +1,73 @@
+use rocket::data::{self, FromDataSimple};
+use rocket::http::{Status};
+use rocket::{Request, Data, Outcome};
+use std::io::Read;
+use ed25519_dalek::{Verifier, Signature};
+use crate::discord::Interaction;
+
+pub struct AuthenticatedInteraction {
+    signature: String,
+    timestamp: String,
+    pub interaction: Interaction,
+}
+
+impl AuthenticatedInteraction {
+    pub fn get_signature(&self) -> &str {
+        &self.signature
+    }
+
+    pub fn get_timestamp(&self) -> &str {
+        &self.timestamp
+    }
+}
+
+impl FromDataSimple for AuthenticatedInteraction {
+    type Error = ();
+
+    fn from_data(request: &Request, data: Data) -> data::Outcome<Self, Self::Error> {
+        let signature_opt = request.headers().get_one("x-signature-ed25519");
+        let timestamp_opt = request.headers().get_one("x-signature-timestamp");
+        if signature_opt.is_some() && timestamp_opt.is_some() {
+            let signature = signature_opt.unwrap().to_owned();
+            let timestamp = timestamp_opt.unwrap().to_owned();
+            println!("signature: `{}` time: `{}`", &signature, &timestamp); // debug
+            if let Ok(hex_data) = hex::decode(signature.clone()) {
+                let mut buffer = [0; 64];
+                for i in 0..64 { // copy hex decode into static-size buffer
+                    if i >= hex_data.len() { break; }
+                    buffer[i] = hex_data[i];
+                }
+                let sign = Signature::new(buffer); // requires [u8; 64]
+                // validate authentication
+                let mut string_buf = String::new();
+                if let Ok(string_len) = data.open().take(1_000_000).read_to_string(&mut string_buf) {
+                    let msg = format!("{}{}", &timestamp, &string_buf[..string_len]);
+                    let verif_result = crate::VERIFICATION_KEY.read()
+                        .unwrap()
+                        .unwrap()
+                        .verify(msg.as_bytes(), &sign);
+                    if verif_result.is_err() {
+                        println!("Signature validation error");
+                        return Outcome::Failure((Status::Unauthorized, ()))
+                    }
+                    if let Ok(payload) = serde_json::from_str(&string_buf[..string_len]) {
+                        let auth = AuthenticatedInteraction {
+                            signature: signature.clone(),
+                            timestamp: timestamp.clone(),
+                            interaction: payload,
+                        };
+                        return Outcome::Success(auth);
+                    }
+                    println!("Invalid json payload");
+                    return Outcome::Failure((Status::Unauthorized, ()))
+                }
+                println!("Invalid body");
+                return Outcome::Failure((Status::Unauthorized, ()))
+            }
+            println!("Invalid signature headers");
+            return Outcome::Failure((Status::Unauthorized, ()))
+        }
+        println!("Missing signature headers");
+        Outcome::Failure((Status::Unauthorized, ()))
+    }
+}
\ No newline at end of file
diff --git a/src/command_definitions.rs b/src/command_definitions.rs
new file mode 100644
index 0000000..8f47200
--- /dev/null
+++ b/src/command_definitions.rs
@@ -0,0 +1,13 @@
+use crate::discord;
+
+// fn foo() -> (definition, private?)
+
+pub fn hello_world() -> (discord::ApplicationCommand, Option<String>) {
+    (discord::ApplicationCommand {
+        id: None,
+        application_id: None,
+        name: "hello-world".to_string(),
+        description: "Hello World".to_string(),
+        options: None,
+    }, None)//Some("616329232389505055".to_string()))
+}
\ No newline at end of file
diff --git a/src/discord.rs b/src/discord.rs
new file mode 100644
index 0000000..848844d
--- /dev/null
+++ b/src/discord.rs
@@ -0,0 +1,128 @@
+use serde::{Deserialize, Serialize};
+
+#[derive(Serialize, Deserialize, Clone)]
+#[serde(tag = "type")]
+pub enum Interaction {
+    #[serde(rename = "1")]
+    Ping {},
+    #[serde(rename = "2")]
+    Command {
+        token: String,
+        // member: Member,
+        id: String,
+        guild_id: String,
+        // data: Command,
+        channel_id: String,
+        //version: usize,
+    },
+}
+
+impl Interaction {
+    pub fn is_ping(&self) -> bool {
+        match self {
+            Self::Ping {..} => true,
+            Self::Command {..} => false,
+        }
+    }
+}
+
+#[derive(Serialize, Deserialize, Clone)]
+#[serde(tag = "type")]
+pub enum InteractionResponse {
+    #[serde(rename = "1")]
+    Pong {},
+    #[serde(rename = "2")]
+    Acknowledge {},
+    #[serde(rename = "3")]
+    ChannelMessage {
+        data: Option<InteractionApplicationCommandCallbackData>,
+    },
+    #[serde(rename = "4")]
+    ChannelMessageWithSource {
+        data: Option<InteractionApplicationCommandCallbackData>,
+    },
+    #[serde(rename = "5")]
+    AcknowledgeWithSource {},
+}
+
+#[derive(Serialize, Deserialize, Clone)]
+pub struct InteractionApplicationCommandCallbackData {
+    pub tts: bool,
+    pub content: String,
+    //pub embeds: Option<Vec<Embed>>,
+    pub allowed_mentions: Option<String>,
+}
+
+// slash command management structures
+#[derive(Serialize, Deserialize, Clone)]
+pub struct ApplicationCommand {
+    pub id: Option<String>,
+    pub application_id: Option<String>,
+    pub name: String,
+    pub description: String,
+    pub options: Option<Vec<ApplicationCommandOption>>,
+}
+
+#[derive(Serialize, Deserialize, Clone)]
+#[serde(tag = "type")]
+pub enum ApplicationCommandOption {
+    #[serde(rename = "1")]
+    SubCommand {
+        name: String,
+        description: String,
+        required: bool,
+        options: Option<Vec<ApplicationCommandOption>>,
+    },
+    #[serde(rename = "2")]
+    SubCommandGroup {
+        name: String,
+        description: String,
+        required: bool,
+        options: Option<Vec<ApplicationCommandOption>>,
+    },
+    #[serde(rename = "3")]
+    String {
+        name: String,
+        description: String,
+        required: bool,
+        choices: Option<Vec<ApplicationCommandOptionChoice>>,
+    },
+    #[serde(rename = "4")]
+    Integer {
+        name: String,
+        description: String,
+        required: bool,
+        choices: Option<Vec<ApplicationCommandOptionChoice>>,
+    },
+    #[serde(rename = "5")]
+    Boolean {
+        name: String,
+        description: String,
+        required: bool,
+    },
+    #[serde(rename = "6")]
+    User {
+        name: String,
+        description: String,
+        required: bool,
+    },
+    #[serde(rename = "7")]
+    Channel {
+        name: String,
+        description: String,
+        required: bool,
+    },
+    #[serde(rename = "8")]
+    Role {
+        name: String,
+        description: String,
+        required: bool,
+    },
+}
+
+#[derive(Serialize, Deserialize, Clone)]
+pub struct ApplicationCommandOptionChoice {
+    pub name: String,
+    pub value: String,
+}
+
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..29e9665
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,149 @@
+#![feature(proc_macro_hygiene, decl_macro)]
+
+mod auth_tools;
+mod discord;
+mod command_definitions;
+
+#[macro_use] extern crate rocket;
+use lazy_static::lazy_static;
+
+use rocket_contrib::json::Json;
+use std::sync::RwLock;
+use crate::auth_tools::{AuthenticatedInteraction};
+use crate::discord::{InteractionResponse, InteractionApplicationCommandCallbackData, ApplicationCommand};
+use crate::command_definitions::hello_world;
+use std::collections::{HashMap, HashSet};
+
+static GLOBAL_COMMAND_KEY: &str = "GLOBAL command KEY";
+
+lazy_static! {
+    pub static ref VERIFICATION_KEY: RwLock<Option<ed25519_dalek::PublicKey>> = RwLock::new(None);
+    pub static ref APPLICATION_ID: RwLock<Option<String>> = RwLock::new(None);
+    pub static ref BOT_TOKEN: RwLock<Option<String>> = RwLock::new(None);
+}
+
+#[post("/", data = "<interaction>")]
+fn root_post(interaction: AuthenticatedInteraction) -> Json<InteractionResponse> {
+    if interaction.interaction.is_ping() {
+        return Json(InteractionResponse::Pong {})
+    }
+    let resp = InteractionResponse::ChannelMessage {
+        data: Some(InteractionApplicationCommandCallbackData {
+            tts: false,
+            content: "Hello".to_string(),
+            allowed_mentions: None,
+        }),
+    };
+    Json(resp)
+}
+
+#[get("/")]
+fn hello_get() -> &'static str {
+    "Hello, why are you here?"
+}
+
+fn main() {
+    // Init verification key
+    let public_key = std::env::var("DISCORD_PUBLIC_KEY")
+        .expect("Environment variable DISCORD_PUBLIC_KEY not found");
+    println!("Discord Pub Key {}", &public_key);
+    *VERIFICATION_KEY.write().unwrap() = Some(ed25519_dalek::PublicKey::from_bytes(
+        &hex::decode(public_key)
+            .expect("Invalid hex string")).expect("Invalid public key"));
+    // get application ID for sending API requests
+    let app_id = std::env::var("DISCORD_APP_ID")
+        .expect("Environment variable DISCORD_APP_ID not found");
+    println!("Discord App Id {}", &app_id);
+    *APPLICATION_ID.write().unwrap() = Some(app_id.to_string());
+    // get bot token for sending API requests
+    let token = std::env::var("DISCORD_TOKEN")
+        .expect("Environment variable DISCORD_TOKEN not found");
+    println!("Discord App Id {}", &app_id);
+    *BOT_TOKEN.write().unwrap() = Some(token.to_string());
+
+    // send API requests to bootstrap commands
+    let req_client = reqwest::blocking::Client::new();
+    let mut seen_cmds = HashMap::<String, HashSet<String>>::new();
+    // TODO
+    register_command(&hello_world, &req_client, &mut seen_cmds);
+    // start web server
+    rocket::ignite().mount("/", routes![root_post, hello_get]).launch();
+}
+
+fn register_command(f: &dyn Fn() -> (discord::ApplicationCommand, Option<String>),
+                    client: &reqwest::blocking::Client,
+                    registered: &mut HashMap<String, HashSet<String>>) {
+    let (payload, guild_opt) = f();
+    if let Some(guild_id) = guild_opt {
+        if !registered.contains_key(&guild_id) {
+            let mut seen_guild_cmds = HashSet::new();
+            let cmds = get_guild_commands(client, &guild_id);
+            for c in cmds {
+                println!("Found app command {} ID:{} App:{}", &c.name, &c.id.unwrap(), guild_id);
+                seen_guild_cmds.insert(c.name);
+            }
+            registered.insert(guild_id.clone(), seen_guild_cmds);
+        }
+        if !registered.get(&guild_id).unwrap().contains(&payload.name) {
+            // create new command
+            let url = format!("https://discord.com/api/v8/applications/{}/guilds/{}/commands", APPLICATION_ID.read().unwrap().as_ref().unwrap().clone(), &guild_id);
+            let res = client.post(&url)
+                .header("Authorization", format!("Bot {}", BOT_TOKEN.read().unwrap().as_ref().unwrap().clone()))
+                .json(&payload)
+                .send();
+            if let Ok(d) = res {
+                println!("`{}` status {}", &payload.name, &d.status().as_str());
+                println!("{}", &d.text().unwrap());
+                registered.get_mut(&guild_id).unwrap().insert(payload.name);
+            }
+        }
+    } else {
+        if !registered.contains_key(GLOBAL_COMMAND_KEY) {
+            let mut seen_cmds = HashSet::new();
+            let cmds = get_commands(client);
+            for c in cmds {
+                println!("Found global command {} ID:{}", &c.name, &c.id.unwrap());
+                seen_cmds.insert(c.name);
+            }
+            registered.insert(GLOBAL_COMMAND_KEY.to_string(), seen_cmds);
+        }
+        if !registered.get(GLOBAL_COMMAND_KEY).unwrap().contains(&payload.name) {
+            // create new command
+            let url = format!("https://discord.com/api/v8/applications/{}/commands", APPLICATION_ID.read().unwrap().as_ref().unwrap().clone());
+            let res = client.post(&url)
+                .header("Authorization", format!("Bot {}", BOT_TOKEN.read().unwrap().as_ref().unwrap().clone()))
+                .json(&payload)
+                .send();
+            if let Ok(d) = res {
+                println!("`{}` status {}", &payload.name, &d.status().as_str());
+                println!("{}", &d.text().unwrap());
+                registered.get_mut(GLOBAL_COMMAND_KEY.clone()).unwrap().insert(payload.name);
+            }
+        }
+
+    }
+}
+
+fn get_commands(client: &reqwest::blocking::Client) -> Vec<ApplicationCommand> {
+    let url = format!("https://discord.com/api/v8/applications/{}/commands", APPLICATION_ID.read().unwrap().as_ref().unwrap().clone());
+    let res = client.get(&url)
+        .header("Authorization", format!("Bot {}", BOT_TOKEN.read().unwrap().as_ref().unwrap().clone()))
+        .send();
+    if let Ok(d) = res {
+        println!("Commands GET status {}", &d.status().as_str());
+        return d.json().unwrap();
+    }
+    return Vec::new();
+}
+
+fn get_guild_commands(client: &reqwest::blocking::Client, guild_id: &str) -> Vec<ApplicationCommand> {
+    let url = format!("https://discord.com/api/v8/applications/{}/guilds/{}/commands", APPLICATION_ID.read().unwrap().as_ref().unwrap().clone(), guild_id);
+    let res = client.get(&url)
+        .header("Authorization", format!("Bot {}", BOT_TOKEN.read().unwrap().as_ref().unwrap().clone()))
+        .send();
+    if let Ok(d) = res {
+        println!("Commands GET status {}", &d.status().as_str());
+        return d.json().unwrap();
+    }
+    return Vec::new();
+}