harn-vm 0.5.38

Async bytecode virtual machine for the Harn programming language
Documentation 
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use std::rc::Rc;

use crate::value::{VmError, VmValue};
use crate::vm::Vm;

pub(crate) fn register_crypto_builtins(vm: &mut Vm) {
    vm.register_builtin("base64_encode", |args, _out| {
        let val = args.first().map(|a| a.display()).unwrap_or_default();
        use base64::Engine;
        Ok(VmValue::String(Rc::from(
            base64::engine::general_purpose::STANDARD.encode(val.as_bytes()),
        )))
    });
    vm.register_builtin("base64_decode", |args, _out| {
        let val = args.first().map(|a| a.display()).unwrap_or_default();
        use base64::Engine;
        match base64::engine::general_purpose::STANDARD.decode(val.as_bytes()) {
            Ok(bytes) => Ok(VmValue::String(Rc::from(
                String::from_utf8_lossy(&bytes).into_owned(),
            ))),
            Err(e) => Err(VmError::Runtime(format!("base64 decode error: {e}"))),
        }
    });

    // Fast structural hash of any VmValue. Uses a stable FNV-1a-style hash
    // over the canonical display form so logically-equal values (per `==`)
    // produce the same 64-bit hash. Intended for bucketing/indexing inside
    // user code, NOT for cryptographic integrity — use sha256 for that.
    vm.register_builtin("hash_value", |args, _out| {
        let val = args.first().unwrap_or(&VmValue::Nil);
        let key = crate::value::value_structural_hash_key(val);
        let mut hash: u64 = 0xcbf29ce484222325;
        for byte in key.as_bytes() {
            hash ^= *byte as u64;
            hash = hash.wrapping_mul(0x100000001b3);
        }
        Ok(VmValue::Int(hash as i64))
    });

    vm.register_builtin("sha256", |args, _out| {
        use sha2::Digest;
        let val = args.first().map(|a| a.display()).unwrap_or_default();
        let hash = sha2::Sha256::digest(val.as_bytes());
        Ok(VmValue::String(Rc::from(format!("{hash:x}"))))
    });
    vm.register_builtin("sha224", |args, _out| {
        use sha2::Digest;
        let val = args.first().map(|a| a.display()).unwrap_or_default();
        let hash = sha2::Sha224::digest(val.as_bytes());
        Ok(VmValue::String(Rc::from(format!("{hash:x}"))))
    });
    vm.register_builtin("sha384", |args, _out| {
        use sha2::Digest;
        let val = args.first().map(|a| a.display()).unwrap_or_default();
        let hash = sha2::Sha384::digest(val.as_bytes());
        Ok(VmValue::String(Rc::from(format!("{hash:x}"))))
    });
    vm.register_builtin("sha512", |args, _out| {
        use sha2::Digest;
        let val = args.first().map(|a| a.display()).unwrap_or_default();
        let hash = sha2::Sha512::digest(val.as_bytes());
        Ok(VmValue::String(Rc::from(format!("{hash:x}"))))
    });
    vm.register_builtin("sha512_256", |args, _out| {
        use sha2::Digest;
        let val = args.first().map(|a| a.display()).unwrap_or_default();
        let hash = sha2::Sha512_256::digest(val.as_bytes());
        Ok(VmValue::String(Rc::from(format!("{hash:x}"))))
    });
    vm.register_builtin("md5", |args, _out| {
        use md5::Digest;
        let val = args.first().map(|a| a.display()).unwrap_or_default();
        let hash = md5::Md5::digest(val.as_bytes());
        Ok(VmValue::String(Rc::from(format!("{hash:x}"))))
    });

    vm.register_builtin("url_encode", |args, _out| {
        let val = args.first().map(|a| a.display()).unwrap_or_default();
        let encoded: String = val
            .bytes()
            .map(|b| match b {
                b'A'..=b'Z' | b'a'..=b'z' | b'0'..=b'9' | b'-' | b'_' | b'.' | b'~' => {
                    (b as char).to_string()
                }
                _ => format!("%{:02X}", b),
            })
            .collect();
        Ok(VmValue::String(Rc::from(encoded)))
    });

    vm.register_builtin("url_decode", |args, _out| {
        let val = args.first().map(|a| a.display()).unwrap_or_default();
        let mut result = Vec::new();
        let bytes = val.as_bytes();
        let mut i = 0;
        while i < bytes.len() {
            if bytes[i] == b'%' && i + 2 < bytes.len() {
                if let Ok(byte) = u8::from_str_radix(&val[i + 1..i + 3], 16) {
                    result.push(byte);
                    i += 3;
                    continue;
                }
            }
            if bytes[i] == b'+' {
                result.push(b' ');
            } else {
                result.push(bytes[i]);
            }
            i += 1;
        }
        Ok(VmValue::String(Rc::from(
            String::from_utf8_lossy(&result).into_owned(),
        )))
    });
}