hyperlight-js-runtime 0.2.1

/*
Copyright 2026  The Hyperlight Authors.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
use alloc::string::{String, ToString as _};

use base64::engine::general_purpose::STANDARD_NO_PAD;
use base64::Engine as _;
use rquickjs::object::Property;
use rquickjs::{Ctx, Exception, Function, Object, String as JsString, Value};

use crate::utils::as_bytes;

#[rquickjs::function(rename = "bytesFrom")]
fn bytes_from<'js>(
    ctx: Ctx<'js>,
    data: Value<'js>,
    encoding: String,
) -> rquickjs::Result<JsString<'js>> {
    if encoding != "base64url" {
        return Err(Exception::throw_type(
            &ctx,
            "Unsupported encoding, only 'base64url' is supported",
        ));
    }

    let mut data = as_bytes(data)?;
    while data.last() == Some(&b'=') {
        // Remove padding characters
        data.pop();
    }
    match STANDARD_NO_PAD.decode(data) {
        Ok(bytes) => {
            let bytes = unsafe { str::from_utf8_unchecked(&bytes) };
            let string = JsString::from_str(ctx, bytes)?;
            Ok(string)
        }
        Err(e) => Err(Exception::throw_internal(&ctx, &e.to_string())),
    }
}

pub fn setup(ctx: &Ctx<'_>) -> rquickjs::Result<()> {
    let globals = ctx.globals();

    // Setup `String.bytesFrom` function.
    let bytes_from = Function::new(ctx.clone(), bytes_from)?;
    let string: Object = globals.get("String")?;
    string.prop("bytesFrom", Property::from(bytes_from))?;
    Ok(())
}