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use std::error::Error;
use js::{
RewriteResult, Rewriter,
cfg::{Config, Flags, UrlRewriter},
};
use js_sys::{Function, Object, Uint8Array};
use oxc::allocator::StringBuilder;
use wasm_bindgen::{JsCast, JsValue, prelude::wasm_bindgen};
use web_sys::Url;
use crate::{
error::{Result, RewriterError},
get_flag, get_obj, get_str, set_obj,
};
// slightly modified https://github.com/ungap/random-uuid/blob/main/index.js
#[wasm_bindgen(inline_js = r#"
export function scramtag() {
return (""+1e10).replace(/[018]/g,
c => (c ^ crypto.getRandomValues(new Uint8Array(1))[0] & 15 >> c / 4).toString(16)
);
}
"#)]
extern "C" {
pub fn scramtag() -> std::string::String;
}
#[wasm_bindgen(typescript_custom_section)]
const REWRITER_OUTPUT: &'static str = r#"
export type JsRewriterOutput = {
js: Uint8Array,
map: Uint8Array,
scramtag: string,
errors: string[],
};
"#;
#[wasm_bindgen]
extern "C" {
#[wasm_bindgen(typescript_type = "JsRewriterOutput")]
pub type JsRewriterOutput;
}
fn get_config(scramjet: &Object) -> Result<Config> {
let config = &get_obj(scramjet, "config")?;
let globals = &get_obj(config, "globals")?;
Ok(Config {
prefix: get_str(config, "prefix")?,
wrapfn: get_str(globals, "wrapfn")?,
wrapthisfn: get_str(globals, "wrapthisfn")?,
importfn: get_str(globals, "importfn")?,
rewritefn: get_str(globals, "rewritefn")?,
metafn: get_str(globals, "metafn")?,
setrealmfn: get_str(globals, "setrealmfn")?,
pushsourcemapfn: get_str(globals, "pushsourcemapfn")?,
})
}
pub struct WasmUrlRewriter(Function);
impl UrlRewriter for WasmUrlRewriter {
fn rewrite(
&self,
_cfg: &Config,
flags: &Flags,
url: &str,
builder: &mut StringBuilder,
module: bool,
) -> std::result::Result<(), Box<dyn Error + Sync + Send>> {
let url = Url::new_with_base(url, &flags.base)
.map_err(RewriterError::from)?
.to_string();
let mut rewritten = self
.0
.call1(&JsValue::NULL, &url.into())
.map_err(RewriterError::from)?
.as_string()
.ok_or_else(|| RewriterError::not_str("url rewriter output"))?;
if module {
rewritten.push_str("?type=module");
}
builder.push_str(&rewritten);
Ok(())
}
}
fn get_url_rewriter(scramjet: &Object) -> Result<WasmUrlRewriter> {
let codec = &get_obj(scramjet, "codec")?;
Ok(WasmUrlRewriter(
get_obj(codec, "encode")?
.dyn_into()
.map_err(|_| RewriterError::not_fn("scramjet.codec.encode"))?,
))
}
pub type JsRewriter = Rewriter<WasmUrlRewriter>;
pub fn create_js(scramjet: &Object) -> Result<JsRewriter> {
let cfg = get_config(scramjet)?;
let url_rewriter = get_url_rewriter(scramjet)?;
Ok(Rewriter::new(cfg, url_rewriter))
}
pub fn get_js_flags(scramjet: &Object, base: String, is_module: bool) -> Result<Flags> {
Ok(Flags {
is_module,
sourcetag: scramtag(),
do_sourcemaps: get_flag(scramjet, &base, "sourcemaps")?,
capture_errors: get_flag(scramjet, &base, "captureErrors")?,
scramitize: get_flag(scramjet, &base, "scramitize")?,
strict_rewrites: get_flag(scramjet, &base, "strictRewrites")?,
base,
})
}
pub fn create_js_output(out: RewriteResult, url: String, src: String) -> Result<JsRewriterOutput> {
let obj = Object::new();
set_obj(&obj, "js", &Uint8Array::from(out.js.as_slice()).into())?;
set_obj(
&obj,
"map",
&Uint8Array::from(out.sourcemap.as_slice()).into(),
)?;
set_obj(&obj, "scramtag", &out.flags.sourcetag.into())?;
#[cfg(feature = "debug")]
{
let src = std::sync::Arc::new(
oxc::diagnostics::NamedSource::new(url, src).with_language("javascript"),
);
let errs: Vec<_> = out
.errors
.into_iter()
.map(|x| format!("{}", x.with_source_code(src.clone())))
.collect();
set_obj(&obj, "errors", &errs.into())?;
}
#[cfg(not(feature = "debug"))]
{
let _ = (url, src);
set_obj(&obj, "errors", &js_sys::Array::new())?;
}
Ok(JsRewriterOutput::from(JsValue::from(obj)))
}
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