use crate::traits::{unpack_closure, VariableHandler};
use libucl_bind::ucl_variable_handler;
use std::ffi::c_void;
use std::os::raw::c_uchar;
use std::ptr::slice_from_raw_parts;
pub struct EnvVariableHandler {
closure:
Box<dyn FnMut(*const c_uchar, usize, *mut *mut c_uchar, *mut usize, *mut bool) -> bool>,
}
impl EnvVariableHandler {
fn with_prefix(prefix: String) -> Self {
let closure = move |data: *const ::std::os::raw::c_uchar,
len: usize,
replace: *mut *mut ::std::os::raw::c_uchar,
replace_len: *mut usize,
need_free: *mut bool| {
let var = unsafe {
let slice = slice_from_raw_parts(data, len).as_ref().unwrap();
std::str::from_utf8(slice).unwrap()
};
if var.starts_with(&prefix) {
if let Ok(mut value) = std::env::var(var) {
let bytes = unsafe { value.as_bytes_mut() };
unsafe {
*need_free = false;
*replace = bytes.as_mut_ptr();
*replace_len = bytes.len();
}
return true;
}
}
false
};
EnvVariableHandler {
closure: Box::new(closure),
}
}
}
impl Default for EnvVariableHandler {
fn default() -> Self {
Self::with_prefix(String::from(""))
}
}
impl VariableHandler for EnvVariableHandler {
fn handle(
&mut self,
ptr: *const u8,
len: usize,
dst: *mut *mut u8,
dst_len: *mut usize,
needs_free: *mut bool,
) -> bool {
self.closure.handle(ptr, len, dst, dst_len, needs_free)
}
fn get_fn_ptr_and_data(&mut self) -> (*mut c_void, ucl_variable_handler) {
unsafe { unpack_closure(&mut self.closure) }
}
}
#[cfg(test)]
mod test {
use super::*;
use crate::traits::VariableHandler;
use crate::{Parser, Priority, DEFAULT_DUPLICATE_STRATEGY};
#[cfg(target_os = "freebsd")]
#[test]
fn basic_env_var_handler() {
let mut handler = EnvVariableHandler::with_prefix("ENV_".to_string());
let (state, callback) = handler.get_fn_ptr_and_data();
let good_var = "ENV_RZZYIBBEBD";
let bad_var = "ENV_AGBDMXLAAH";
std::env::set_var(good_var, "yes");
std::env::remove_var(bad_var);
std::env::set_var("RZZYIBBEBD", "yes");
let input = r#"
good = "${ENV_RZZYIBBEBD}"
bad = "${ENV_AGBDMXLAAH}"
also_bad = "${RZZYIBBEBD}"
"#;
let mut parser = Parser::default();
unsafe {
parser.set_variables_handler_raw(callback, state);
}
parser
.add_chunk_full(input, Priority::default(), DEFAULT_DUPLICATE_STRATEGY)
.unwrap();
let root = parser.get_object().unwrap();
let good = root.lookup("good").unwrap().as_string().unwrap();
assert_eq!("yes", &good);
let bad = root.lookup("bad").unwrap().as_string().unwrap();
assert_eq!("${ENV_AGBDMXLAAH}", bad);
let also_bad = root.lookup("also_bad").unwrap().as_string().unwrap();
assert_eq!("${RZZYIBBEBD}", also_bad);
}
}