From 52013d1fde52360694f7ef5d8eed43585c8f4337 Mon Sep 17 00:00:00 2001
From: Keuin <keuinx@gmail.com>
Date: Mon, 28 Mar 2022 10:12:23 +0800
Subject: Support legacy GET request (for backward compatibility).

---
 src/main.rs | 18 ++++++++++++++----
 src/web.rs  | 22 +++++++++++++++++++++-
 2 files changed, 35 insertions(+), 5 deletions(-)

diff --git a/src/main.rs b/src/main.rs
index f67a6bc..86f1428 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,3 +1,4 @@
+use std::collections::HashMap;
 use std::convert::Infallible;
 use std::net::SocketAddr;
 use std::ops::Deref;
@@ -59,25 +60,34 @@ async fn main() {
 
     let db = config.db_file.as_str();
     info!(db, "Opening database...");
+    // TODO replace Arc<DbPool> with DbPool::clone
     let db: Arc<DbPool> = Arc::new(database::open(db)
         .await.expect(&*format!("cannot open database {}", db)));
 
     info!("Spawning bot coroutine...");
     let bot = Bot::new(config.bot_token);
-    let send_message = warp::path("message")
-        .and(warp::post())
+    tokio::spawn(bot::repl(bot.clone(), db.clone()));
+
+    info!("Initializing HTTP routes...");
+    let route_post = warp::post()
         .and(warp::body::content_length_limit(MAX_BODY_LENGTH))
         .and(warp::body::json())
         .and(with_db(db.deref().clone()))
         .and(with_bot(bot.clone()))
         .and_then(web::handler);
-    tokio::spawn(bot::repl(bot, db.clone()));
+    let route_get = warp::get()
+        .and(warp::query::<HashMap<String, String>>())
+        .and(with_db(db.deref().clone()))
+        .and(with_bot(bot.clone()))
+        .and_then(web::get_handler);
+    let routes = warp::path("message")
+        .and(route_post).or(route_get);
 
     info!("Starting HTTP server...");
     let endpoint: SocketAddr = config.listen.parse()
         .expect("Cannot parse `listen` as endpoint.");
     info!("Start listening on {}", endpoint);
-    tokio::spawn(warp::serve(send_message).run(endpoint));
+    tokio::spawn(warp::serve(routes).run(endpoint));
 
     debug!("Waiting for Ctrl-C in main coroutine...");
     tokio::signal::ctrl_c().await.unwrap();
diff --git a/src/web.rs b/src/web.rs
index 9ec73fd..dc42bfc 100644
--- a/src/web.rs
+++ b/src/web.rs
@@ -1,3 +1,4 @@
+use std::collections::HashMap;
 use std::fmt;
 use std::fmt::Formatter;
 
@@ -5,6 +6,7 @@ use serde_derive::{Deserialize, Serialize};
 use teloxide::{prelude2::*};
 use tracing::{debug, error, info, warn};
 use warp::{Rejection, Reply};
+use warp::reply::Json;
 
 use crate::{Bot, database, DbPool};
 
@@ -32,8 +34,26 @@ impl fmt::Display for SendMessageResponse {
     }
 }
 
+pub async fn get_handler(params: HashMap<String, String>, db: DbPool, bot: Bot)
+                         -> std::result::Result<impl Reply, Rejection> {
+    let token = params.get("token");
+    let message = params.get("message");
+    if token == None || message == None {
+        return Ok(warp::reply::json(&SendMessageResponse {
+            success: false,
+            message: String::from(concat!("Missing parameters. ",
+            "Usage: GET /<path>?token=<kimikuri_token>&message=<message>")),
+        }));
+    }
+    let message = SendMessage {
+        token: token.unwrap().clone(),
+        message: message.unwrap().clone(),
+    };
+    handler(message, db, bot).await
+}
+
 pub async fn handler(req: SendMessage, db: DbPool, bot: Bot)
-                     -> std::result::Result<impl Reply, Rejection> {
+                     -> std::result::Result<Json, Rejection> {
     info!("Income API request: {}", req);
     let user =
         database::get_user_by_token(&db, req.token.as_str()).await;
-- 
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