Unminify module scripts. (#34206)

* script: Unminify module scripts.

Signed-off-by: Josh Matthews <josh@joshmatthews.net>

* Fix clippy.

Signed-off-by: Josh Matthews <josh@joshmatthews.net>

---------

Signed-off-by: Josh Matthews <josh@joshmatthews.net>

components/script/unminify.rs

@@ -2,15 +2,27 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
 
+use std::env;
 use std::fs::{create_dir_all, File};
-use std::io::{Error, ErrorKind};
+use std::io::{Error, Read, Seek, Write};
 use std::path::{Path, PathBuf};
 use std::process::Command;
+use std::rc::Rc;
 
 use servo_url::ServoUrl;
 use tempfile::NamedTempFile;
 use uuid::Uuid;
 
+use crate::dom::bindings::str::DOMString;
+
+pub(crate) trait ScriptSource {
+    fn unminified_dir(&self) -> Option<String>;
+    fn extract_bytes(&self) -> &[u8];
+    fn rewrite_source(&mut self, source: Rc<DOMString>);
+    fn url(&self) -> ServoUrl;
+    fn is_external(&self) -> bool;
+}
+
 pub fn create_temp_files() -> Option<(NamedTempFile, File)> {
     // Write the minified code to a temporary file and pass its path as an argument
     // to js-beautify to read from. Meanwhile, redirect the process' stdout into
@@ -53,20 +65,11 @@ pub fn execute_js_beautify(input: &Path, output: File, file_type: BeautifyFileTy
 }
 
 pub fn create_output_file(
-    unminified_dir: Option<String>,
+    unminified_dir: String,
     url: &ServoUrl,
     external: Option<bool>,
 ) -> Result<File, Error> {
-    let path = match unminified_dir {
-        Some(unminified_dir) => PathBuf::from(unminified_dir),
-        None => {
-            warn!("Unminified file directory not found");
-            return Err(Error::new(
-                ErrorKind::NotFound,
-                "Unminified file directory not found",
-            ));
-        },
-    };
+    let path = PathBuf::from(unminified_dir);
 
     let (base, has_name) = match url.as_str().ends_with('/') {
         true => (
@@ -98,3 +101,35 @@ pub fn create_output_file(
 
     File::create(path)
 }
+
+pub(crate) fn unminify_js(script: &mut dyn ScriptSource) {
+    let Some(unminified_dir) = script.unminified_dir() else {
+        return;
+    };
+
+    if let Some((mut input, mut output)) = create_temp_files() {
+        input.write_all(script.extract_bytes()).unwrap();
+
+        if execute_js_beautify(
+            input.path(),
+            output.try_clone().unwrap(),
+            BeautifyFileType::Js,
+        ) {
+            let mut script_content = String::new();
+            output.seek(std::io::SeekFrom::Start(0)).unwrap();
+            output.read_to_string(&mut script_content).unwrap();
+            script.rewrite_source(Rc::new(DOMString::from(script_content)));
+        }
+    }
+
+    match create_output_file(unminified_dir, &script.url(), Some(script.is_external())) {
+        Ok(mut file) => file.write_all(script.extract_bytes()).unwrap(),
+        Err(why) => warn!("Could not store script {:?}", why),
+    }
+}
+
+pub(crate) fn unminified_path(dir: &str) -> String {
+    let mut path = env::current_dir().unwrap();
+    path.push(dir);
+    path.into_os_string().into_string().unwrap()
+}