From a8046f11e551c69d1e45cd432694b4c8a04ee7b7 Mon Sep 17 00:00:00 2001
From: alyx <alyx@aleteoryx.me>
Date: Sat, 6 Apr 2024 16:59:12 -0400
Subject: Lua dev mode functional

---
 src/theming/hbs.rs |  6 +++++-
 src/theming/lua.rs | 45 +++++++++++++++++++++++++++++++++++----------
 2 files changed, 40 insertions(+), 11 deletions(-)

(limited to 'src/theming')

diff --git a/src/theming/hbs.rs b/src/theming/hbs.rs
index 67a2ae4..398715a 100644
--- a/src/theming/hbs.rs
+++ b/src/theming/hbs.rs
@@ -18,7 +18,7 @@ static HANDLEBARS: LazyLock<Handlebars> = LazyLock::new(|| {
     log::info!("Registering internal handlebars theme `{key}`");
     hb.register_template_string(key, fulltext).unwrap();
   }
-  hb.set_dev_mode(CONFIG.theme_debug);
+  hb.set_dev_mode(CONFIG.theme_dev);
 
   if let Some(themes_dir) = CONFIG.theme_dir.as_ref() {
     log::info!("Registering handlebars theme dir `{themes_dir}` with extension `{}`.", CONFIG.theme_ext_hbs);
@@ -34,3 +34,7 @@ pub fn render_theme(name: &str, ctx: &crate::ctx::Ctx) -> Option<Result<String,
   let render = templ.renders(&HANDLEBARS, &ctx, &mut RenderContext::new(Some(&name.into()))).map_err(|_| StatusCode::INTERNAL_SERVER_ERROR);
   Some(render)
 }
+
+pub fn touch() {
+  LazyLock::force(&HANDLEBARS);
+}
diff --git a/src/theming/lua.rs b/src/theming/lua.rs
index 6bd6989..0699f09 100644
--- a/src/theming/lua.rs
+++ b/src/theming/lua.rs
@@ -18,7 +18,7 @@ static LUA: LazyLock<Mutex<Lua>> = LazyLock::new(|| {
   lua.sandbox(true).expect("lua initialization");
 
   lua.set_compiler(
-    if CONFIG.theme_debug { Compiler::new().set_optimization_level(0).set_debug_level(2) }
+    if CONFIG.theme_dev { Compiler::new().set_optimization_level(0).set_debug_level(2) }
     else { Compiler::new().set_optimization_level(2).set_debug_level(1) }
   );
 
@@ -38,14 +38,19 @@ static LUA: LazyLock<Mutex<Lua>> = LazyLock::new(|| {
 
   for (k, v) in INTERNAL_THEMES {
     log::info!("Registering compiled lua theme `{k}`.");
-    let _ = themes.set(*k, lua.load(*v).into_function().expect("loading internal theme"));
+    let _ = themes.set(*k, lua.load(*v).eval::<Value>().expect("loading internal theme"));
   }
 
   if let Some(theme_dir) = CONFIG.theme_dir.as_ref() {
-    log::info!("Registering lua theme dir `{theme_dir}` with extension `{}`.", CONFIG.theme_ext_lua);
-    for (k, v) in walk_dir(theme_dir.as_ref().as_ref()).expect("walking theme dir") {
-      log::info!("Registering runtime lua theme `{k}`.");
-      let _ = themes.set(k, lua.load(v).eval::<Value>().expect("loading internal theme"));
+    if !CONFIG.theme_dev {
+      log::info!("Registering lua theme dir `{theme_dir}` with extension `{}`.", CONFIG.theme_ext_lua);
+      for (k, v) in walk_dir(theme_dir.as_ref().as_ref()).expect("walking theme dir") {
+        log::info!("Registering runtime lua theme `{k}`.");
+        let _ = themes.set(k, lua.load(v).eval::<Value>().expect("loading external theme"));
+      }
+    }
+    else {
+      log::info!("Ready to dev-load lua themes from `{theme_dir}` with extension `{}`.", CONFIG.theme_ext_lua);
     }
   }
 
@@ -86,13 +91,29 @@ fn walk_dir(path: &Path) -> std::io::Result<Vec<(String, String)>> {
 }
 
 pub fn render_theme(name: &str, ctx: &crate::ctx::Ctx) -> Option<Result<String, StatusCode>> {
+  if name == ".." || name.starts_with("../") || name.ends_with("/..") || name.contains("/../") {
+    return Some(Err(StatusCode::BAD_REQUEST))
+  }
+
   LUA.clear_poison();
   let lua = LUA.lock().expect("FIXME: Mutex poisoning race condition.");
   let themes: Table = lua.globals().get("__themes").unwrap();
-  let Ok(Value::Function(theme)) = themes.get(name)
-  else {
-    return None;
-  };
+  let theme;
+  match themes.get(name) {
+    Ok(Value::Function(themefn)) => { theme = themefn; },
+    Ok(Value::Nil) if !CONFIG.theme_dev || CONFIG.theme_dir.is_none() => { return None; },
+    Ok(Value::Nil) => {
+      let code = fs::read_to_string(CONFIG.theme_dir.as_ref().unwrap().to_string() + "/" + name + &CONFIG.theme_ext_lua).ok()?;
+      let res = lua.load(code).eval::<Value>();
+      match res {
+        Ok(Value::Function(themefn)) => { theme = themefn; },
+        Ok(v) => { log::error!("Got `{v:?}` instead of Function when dev-loading `{name}`."); return Some(Err(StatusCode::INTERNAL_SERVER_ERROR)); },
+        Err(e) => { log::error!("Error dev-loading `{name}`: {e}"); return Some(Err(StatusCode::INTERNAL_SERVER_ERROR)); },
+      }
+    },
+    Ok(v) => { log::error!("Got `{v:?}` instead of Function when loading `{name}`."); return Some(Err(StatusCode::INTERNAL_SERVER_ERROR)); }
+    Err(e) => { log::error!("Error loading `{name}`: {e}"); return Some(Err(StatusCode::INTERNAL_SERVER_ERROR)); }, //TODO: gate behind flag
+  }
 
   let ctx = match lua.to_value(ctx) {
     Ok(ok) => ok,
@@ -104,3 +125,7 @@ pub fn render_theme(name: &str, ctx: &crate::ctx::Ctx) -> Option<Result<String,
 
   Some(theme.call((ctx,)).map_err(|e| { log::error!("Lua theme execution error: {e}"); StatusCode::INTERNAL_SERVER_ERROR }))
 }
+
+pub fn touch() {
+  LazyLock::force(&LUA);
+}
-- 
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