add hash check

src/main.rs

@@ -1,10 +1,61 @@
 mod http;
-use std::path::PathBuf;
+use std::{fs, path::PathBuf};
+
+#[derive(serde::Deserialize, serde::Serialize)]
+struct CdnFile {
+    name: String,
+    size: u32,
+    hash: String,
+}
+
+struct Game<'a> {
+    engine: &'a str,
+    client: &'a str,
+    references: &'a [&'a str],
+}
 
 const MASTER: &str = "https://master.alterware.dev";
+const GAMES: [Game; 2] = [
+    Game {
+        engine: "iw4",
+        client: "iw4-sp",
+        references: &["iw4sp.exe", "iw4mp.exe"],
+    },
+    Game {
+        engine: "iw5",
+        client: "iw5-mod",
+        references: &["iw5sp.exe", "iw5mp.exe", "iw5mp_server.exe"],
+    },
+];
 
-fn download_and_launch(url: &str, file_path: &PathBuf) {
-    http::download_file(url, file_path);
+fn file_get_sha1(path: &PathBuf) -> String {
+    let mut sha1 = sha1_smol::Sha1::new();
+    sha1.update(&fs::read(path).unwrap());
+    sha1.digest().to_string()
+}
+
+fn download_and_launch(url: &str, file_path: &PathBuf, hash: Option<String>) {
+    if let Some(parent) = file_path.parent() {
+        if !parent.exists() {
+            fs::create_dir_all(parent).unwrap();
+        }
+    }
+
+    if file_path.exists() && hash.is_some() {
+        let sha1_local = file_get_sha1(file_path).to_lowercase();
+        let sha1_remote = hash.unwrap().to_lowercase();
+        if sha1_local != sha1_remote {
+            println!("Local hash: {}", sha1_local);
+            println!("Remote hash: {}", sha1_remote);
+            println!("Updating {}...", file_path.display());
+            http::download_file(url, file_path);
+        }
+    } else {
+        println!("Downloading {}...", file_path.display());
+        http::download_file(url, file_path);
+    }
+
+    println!("Launching {}...", file_path.display());
     std::process::Command::new(file_path)
         .spawn()
         .unwrap()
@@ -12,38 +63,45 @@ fn download_and_launch(url: &str, file_path: &PathBuf) {
         .unwrap();
 }
 
-fn main() {
-    let args: Vec<String> = std::env::args().collect();
-    let game: String;
-    if args.len() > 1 {
-        game = String::from(&args[1]);
-    } else {
-        // check if iw4sp.exe or iw4mp.exe exists
-        if std::path::Path::new("iw4sp.exe").exists() || std::path::Path::new("iw4mp.exe").exists()
-        {
-            game = String::from("iw4-sp");
-        } else if std::path::Path::new("iw5sp.exe").exists()
-            || std::path::Path::new("iw5mp.exe").exists()
-            || std::path::Path::new("iw5mp_server.exe").exists()
-        {
-            game = String::from("iw5-mod");
-        } else {
-            println!("No game specified and no game found in current directory");
-            return;
+fn get_hash(game: &Game) -> Option<String> {
+    let cdn_info: Vec<CdnFile> = serde_json::from_str(&http::get_body_string(
+        format!("{}/files.json?{}", MASTER, rand::Rng::gen_range(&mut rand::thread_rng(), 0..1000)).as_str(),
+    ))
+    .unwrap();
+
+    for file in cdn_info {
+        if file.name == format!("{}/{}.exe", game.engine, game.client) {
+            return Some(file.hash);
         }
     }
 
-    if game == "iw4-sp" {
-        download_and_launch(
-            &format!("{}/iw4/iw4-sp.exe", MASTER),
-            &PathBuf::from("iw4-sp.exe"),
-        );
-    } else if game == "iw5-mod" {
-        download_and_launch(
-            &format!("{}/iw5/iw5-mod.exe", MASTER),
-            &PathBuf::from("iw5-mod.exe"),
-        );
+    None
+}
+
+fn main() {
+    let args: Vec<String> = std::env::args().collect();
+    let mut game: String = String::new();
+    if args.len() > 1 {
+        game = String::from(&args[1]);
     } else {
-        println!("Invalid game");
+        'main: for g in GAMES.iter() {
+            for r in g.references.iter() {
+                if std::path::Path::new(r).exists() {
+                    game = String::from(g.client);
+                    break 'main;
+                }
+            }
+        }
+    }
+
+    for g in GAMES.iter() {
+        if g.client == game {
+            download_and_launch(
+                &format!("{}/{}/{}.exe?{}", MASTER, g.engine, g.client, rand::Rng::gen_range(&mut rand::thread_rng(), 0..1000)),
+                &PathBuf::from(format!("{}.exe", g.client)),
+                get_hash(g)
+            );
+            return;
+        }
     }
 }