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small script can reach the network, a database, the filesystem, and the terminal without any setup. + +```sh +a file.lua +``` + +That's the whole interface. The script is the program. + +## What it is + +`a` is not a Lua implementation; it embeds [Lua 5.5](https://www.lua.org/) (via [`mlua`](https://github.com/mlua-rs/mlua)) and adds the parts stock Lua leaves out. Plain Lua is small and pleasant but ships almost no standard library and no way to talk to the outside world without C modules and a build toolchain. `a` fills that in with a standard library built partly in Rust and partly in Lua, plus the IO access that makes scripts actually useful. + +The result is a single binary you point at a `.lua` file. No package manager, no build step, no project scaffolding, just a script and the tools it needs to do real work. + +## The standard library + +This is the point of `a`. Planned surface: + +- **Networking** — HTTP client, WebSocket, and MQTT (3.1.1 and 5), with high-level APIs. +- **SQLite** — a real embedded database one call away. +- **Filesystem** — ergonomic read/write/glob/walk, without the ceremony of stock Lua's `io`. +- **Terminal UI** — interactive line and full-screen TUI in the spirit of `ncurses`, but without the awkwardness. + +Each should feel native: the common case is one obvious call, not a setup ritual. + +## How it works + +- Embeds Lua 5.5 via `mlua`, on an async core ([`tokio`](https://tokio.rs/)) so IO-heavy scripts don't block. +- A single self-contained binary. No LuaRocks, no make, no virtualenv. +- Scripts run in a **sandboxed** environment modeled on [Luau's safe environment](https://luau.org/sandbox): `io`, `package`, and `debug` are not loaded; `os` is trimmed to its time functions; the bytecode/chunk-loading escape hatches (`load`, `loadfile`, `dofile`, `string.dump`) are removed. The library `a` provides is the sanctioned way to reach the outside world. +- A leading `#!` shebang line is skipped, so scripts can be made executable directly. + +## Building + +```sh +cargo build --release +# binary at target/release/a + +cargo run -- lua/test.lua # run a script during development +``` + +Requires a Rust toolchain (2024 edition). Lua is vendored and built from source, so no system Lua is needed. diff --git a/lua/stdlib/math.lua b/lua/stdlib/math.lua new file mode 100644 index 0000000..996097c --- /dev/null +++ b/lua/stdlib/math.lua @@ -0,0 +1,115 @@ +-- Round a finite float half away from zero, exactly. +-- math.modf is exact, unlike the naive floor(x + 0.5) which goes wrong +-- for values like 0.49999999999999994 (x + 0.5 rounds up to 1.0 in the float domain). +local function roundHalfAwayFromZero(x) + local i, f = math.modf(x) + if f >= 0.5 then + return i + 1 + elseif f <= -0.5 then + return i - 1 + end + return i +end + +--- Round a number to the nearest integer, or to N decimal places. +--- Rounds half away from zero. round(value, 0) returns an integer; round(value, places > 0) returns a float. +function math.round(value, places) + if type(value) ~= "number" then + error("round() called with a non-number value") + end + + if places == nil then + places = 0 + else + places = math.tointeger(places) + if places == nil then + error("round() places must be an integer number") + end + if places < 0 then + error("round() called with negative places") + end + end + + if math.type(value) == "integer" then + if places == 0 then + return value + end + return value + 0.0 + end + + if not math.isFinite(value) then + error("round() called with a non-finite value (NaN or infinity)") + end + + if places == 0 then + local int = math.tointeger(roundHalfAwayFromZero(value)) + if int == nil then + error("round() called with value out of range of Lua integer") + end + return int + end + + local mul = 10.0 ^ places + local scaled = value * mul + if not math.isFinite(scaled) then + return value + end + return roundHalfAwayFromZero(scaled) / mul +end + +--- Clamp a number to an interval [min, max]. Either bound may be nil (half-open). +function math.clamp(value, min, max) + if type(value) ~= "number" then + error("Non-number passed to clamp() as value") + end + if min ~= nil and type(min) ~= "number" then + error("Non-number passed to clamp() as minimum") + end + if max ~= nil and type(max) ~= "number" then + error("Non-number passed to clamp() as maximum") + end + if min ~= nil and max ~= nil and min > max then + error("clamp() minimum is greater than maximum") + end + if min ~= nil and value < min then return min end + if max ~= nil and value > max then return max end + return value +end + +--- Return true if value is a finite number (not NaN or infinity). +function math.isFinite(value) + if type(value) ~= "number" then return false end + return value == value and value ~= math.huge and value ~= -math.huge +end + +--- Return the sign of a number: -1, 0, or 1. NaN yields 0. +function math.sign(value) + if type(value) ~= "number" then + error("Non-number passed to sign()") + end + if value > 0 then return 1 + elseif value < 0 then return -1 + else return 0 + end +end + +--- Scale a value linearly from [inMin, inMax] to [outMin, outMax]. +--- If clamp is true, the result is clamped to the output range. +function math.scale(value, inMin, inMax, outMin, outMax, clamp) + if type(value) ~= "number" then error("Non-number passed to scale() as value") end + if type(inMin) ~= "number" or type(inMax) ~= "number" then error("Non-number passed to scale() as input range") end + if type(outMin) ~= "number" or type(outMax) ~= "number" then error("Non-number passed to scale() as output range") end + if inMin == inMax then error("Input range cannot be zero (inMin == inMax)") end + + local ratio = (value - inMin) / (inMax - inMin) + local result = outMin + ratio * (outMax - outMin) + + if clamp then + local lo, hi = outMin, outMax + if lo > hi then lo, hi = hi, lo end + if result < lo then return lo + elseif result > hi then return hi + end + end + return result +end diff --git a/lua/stdlib/table.lua b/lua/stdlib/table.lua new file mode 100644 index 0000000..94b50e5 --- /dev/null +++ b/lua/stdlib/table.lua @@ -0,0 +1,260 @@ +--- Make a read-only proxy of a table. Reads pass through; writes raise an error. +--- Caveat: pairs(), next() and # see no contents (proxy is empty). Intended for API namespaces. +function table.readonly(tbl, name) + if type(tbl) ~= "table" then + error("table.readonly: argument is not a table (got " .. type(tbl) .. ")") + end + if name ~= nil and type(name) ~= "string" then + error("table.readonly: name is not a string (got " .. type(name) .. ")") + end + local message = "Attempt to update a read-only table" + if name ~= nil then message = message .. " " .. name end + return setmetatable({}, { + __index = tbl, + __newindex = function() error(message, 2) end, + __metatable = false, + }) +end + +--- Filter a table by predicate, preserving keys. May leave gaps in a sequence table. +function table.filter(tbl, predicate) + if type(tbl) ~= "table" then error("table.filter: table argument is not a table (got " .. type(tbl) .. ")") end + if type(predicate) ~= "function" then error("table.filter: predicate is not a function (got " .. type(predicate) .. ")") end + local result = {} + for k, v in pairs(tbl) do + if predicate(v) then result[k] = v end + end + return result +end + +--- Filter a sequence table by predicate, producing a new gapless sequence. +function table.ifilter(tbl, predicate) + if type(tbl) ~= "table" then error("table.ifilter: argument is not a table (got " .. type(tbl) .. ")") end + if type(predicate) ~= "function" then error("table.ifilter: predicate is not a function (got " .. type(predicate) .. ")") end + local result = {} + for i = 1, #tbl do + local v = tbl[i] + if predicate(v) then result[#result + 1] = v end + end + return result +end + +--- Map values through a function, preserving keys. +function table.map(tbl, mapper) + if type(tbl) ~= "table" then error("table.map: table argument is not a table (got " .. type(tbl) .. ")") end + if type(mapper) ~= "function" then error("table.map: mapper is not a function (got " .. type(mapper) .. ")") end + local result = {} + for k, v in pairs(tbl) do result[k] = mapper(v) end + return result +end + +--- Map values through a function, dropping nils. May leave gaps in a sequence table. +function table.filterMap(tbl, mapper) + if type(tbl) ~= "table" then error("table.filterMap: table argument is not a table (got " .. type(tbl) .. ")") end + if type(mapper) ~= "function" then error("table.filterMap: mapper is not a function (got " .. type(mapper) .. ")") end + local result = {} + for k, v in pairs(tbl) do + local res = mapper(v) + if res ~= nil then result[k] = res end + end + return result +end + +--- Map a sequence through a function, dropping nils, producing a gapless sequence. +function table.ifilterMap(tbl, mapper) + if type(tbl) ~= "table" then error("table.ifilterMap: argument is not a table (got " .. type(tbl) .. ")") end + if type(mapper) ~= "function" then error("table.ifilterMap: mapper is not a function (got " .. type(mapper) .. ")") end + local result = {} + for i = 1, #tbl do + local res = mapper(tbl[i]) + if res ~= nil then result[#result + 1] = res end + end + return result +end + +--- Merge tables into a new table. Sequence parts are appended in order; other keys are +--- copied with later arguments overwriting earlier ones. Not recursive; not deep. +function table.merge(...) + local result = {} + local n = 0 + for argi = 1, select("#", ...) do + local tbl = select(argi, ...) + if type(tbl) ~= "table" then + error("table.merge: argument #" .. argi .. " is not a table (got " .. type(tbl) .. ")") + end + local len = 0 + for i, v in ipairs(tbl) do + n = n + 1 + result[n] = v + len = i + end + for k, v in pairs(tbl) do + if not (math.type(k) == "integer" and k >= 1 and k <= len) then + result[k] = v + end + end + end + return result +end + +local MERGE_DEPTH_LIMIT = 100 + +local function deepCopy(value, level) + if type(value) ~= "table" then return value end + if level > MERGE_DEPTH_LIMIT then error("table.deepMerge/deepCopy recursion too deep") end + local result = {} + for k, v in pairs(value) do result[k] = deepCopy(v, level + 1) end + return result +end + +local function mergeRecurse(level, ...) + if level > MERGE_DEPTH_LIMIT then error("table.deepMerge recursion too deep") end + local result = {} + local n = 0 + for argi = 1, select('#', ...) do + local tbl = select(argi, ...) + if type(tbl) ~= "table" then + error("table.deepMerge: argument #" .. argi .. " is not a table (got " .. type(tbl) .. ")") + end + local len = 0 + for i, v in ipairs(tbl) do + n = n + 1 + result[n] = deepCopy(v, level) + len = i + end + for k, v in pairs(tbl) do + if not (math.type(k) == "integer" and k >= 1 and k <= len) then + if type(v) == "table" and type(result[k]) == "table" then + result[k] = mergeRecurse(level + 1, result[k], v) + else + result[k] = deepCopy(v, level) + end + end + end + end + return result +end + +--- Recursively merge tables. Nested tables on both sides are merged; other values are overwritten. +--- The result shares no tables with the inputs (everything is deep-copied). +function table.deepMerge(...) + return mergeRecurse(1, ...) +end + +--- Deep-copy a table at all levels (excluding metatables). +function table.deepCopy(value) + if type(value) ~= "table" then + error("table.deepCopy: argument is not a table (got " .. type(value) .. ")") + end + return deepCopy(value, 1) +end + +--- Reduce all values in a table to one using a function. Iteration order is unspecified. +function table.reduce(tbl, reducer, initialValue) + if type(tbl) ~= "table" then error("table.reduce: table argument is not a table (got " .. type(tbl) .. ")") end + if type(reducer) ~= "function" then error("table.reduce: reducer is not a function (got " .. type(reducer) .. ")") end + local accumulator = initialValue + for _, v in pairs(tbl) do accumulator = reducer(accumulator, v) end + return accumulator +end + +--- Reduce a sequence table to one value, iterating in order. +function table.ireduce(tbl, reducer, initialValue) + if type(tbl) ~= "table" then error("table.ireduce: table argument is not a table (got " .. type(tbl) .. ")") end + if type(reducer) ~= "function" then error("table.ireduce: reducer is not a function (got " .. type(reducer) .. ")") end + local accumulator = initialValue + for _, v in ipairs(tbl) do accumulator = reducer(accumulator, v) end + return accumulator +end + +--- Return the minimum value in a table. Returns nil for an empty table. NaN propagates. +function table.min(tbl) + if type(tbl) ~= "table" then error("table.min: argument is not a table (got " .. type(tbl) .. ")") end + local min + for _, val in pairs(tbl) do + if val ~= val then return val end + if min == nil or val < min then min = val end + end + return min +end + +--- Return the maximum value in a table. Returns nil for an empty table. NaN propagates. +function table.max(tbl) + if type(tbl) ~= "table" then error("table.max: argument is not a table (got " .. type(tbl) .. ")") end + local max + for _, val in pairs(tbl) do + if val ~= val then return val end + if max == nil or val > max then max = val end + end + return max +end + +--- Return the arithmetic mean of all values. Returns nil for an empty table. NaN propagates. +function table.mean(tbl) + if type(tbl) ~= "table" then error("table.mean: argument is not a table (got " .. type(tbl) .. ")") end + local sum + local count = 0 + for _, val in pairs(tbl) do + count = count + 1 + sum = sum and sum + val or val + end + return count > 0 and sum / count or nil +end + +--- Return the sum of all values. Returns 0 for an empty table. NaN propagates. +function table.sum(tbl) + if type(tbl) ~= "table" then error("table.sum: argument is not a table (got " .. type(tbl) .. ")") end + local sum = 0 + for _, val in pairs(tbl) do sum = sum + val end + return sum +end + +--- Return an array of all keys. Order is unspecified. +function table.keys(tbl) + if type(tbl) ~= "table" then error("table.keys: argument is not a table (got " .. type(tbl) .. ")") end + local result = {} + for k in pairs(tbl) do result[#result + 1] = k end + return result +end + +--- Return an array of all values. Order is unspecified. +function table.values(tbl) + if type(tbl) ~= "table" then error("table.values: argument is not a table (got " .. type(tbl) .. ")") end + local result = {} + for _, v in pairs(tbl) do result[#result + 1] = v end + return result +end + +--- Return true if the table contains the given value (compared with ==). +function table.contains(tbl, value) + if type(tbl) ~= "table" then error("table.contains: argument is not a table (got " .. type(tbl) .. ")") end + for _, v in pairs(tbl) do + if v == value then return true end + end + return false +end + +--- Find a value matching a predicate. Returns (value, key) or (nil, nil) if not found. +--- Check the returned key for nil to distinguish a stored false from "not found". +function table.find(tbl, predicate) + if type(tbl) ~= "table" then error("table.find: table argument is not a table (got " .. type(tbl) .. ")") end + if type(predicate) ~= "function" then error("table.find: predicate is not a function (got " .. type(predicate) .. ")") end + for k, v in pairs(tbl) do + if predicate(v) then return v, k end + end + return nil, nil +end + +--- Return true if the table has no elements. +function table.isEmpty(tbl) + if type(tbl) ~= "table" then error("table.isEmpty: argument is not a table (got " .. type(tbl) .. ")") end + return next(tbl) == nil +end + +--- Return a new array with elements in reverse order. +function table.reverse(tbl) + if type(tbl) ~= "table" then error("table.reverse: argument is not a table (got " .. type(tbl) .. ")") end + local result = {} + for i = #tbl, 1, -1 do result[#result + 1] = tbl[i] end + return result +end diff --git a/lua/stdlib/utils.lua b/lua/stdlib/utils.lua new file mode 100644 index 0000000..6e8f540 --- /dev/null +++ b/lua/stdlib/utils.lua @@ -0,0 +1,82 @@ +-- Lua-side of the utils module. +-- utils.NULL, utils.isNull, utils.toJSON, utils.fromJSON are provided by Rust before this runs. + +local NIL_ERROR_PLACEHOLDER = "unspecified error" + +-- Pretty-print any Lua value as a string. +local function dumpValue(val, depth, seen) + if depth > 20 then return "..." end + local t = type(val) + if t == "nil" then + return "nil" + elseif t == "boolean" or t == "number" then + return tostring(val) + elseif t == "string" then + return string.format("%q", val) + elseif t == "table" then + if utils.isNull(val) then return "null" end + if seen[val] then return "" end + seen[val] = true + local parts = {} + local len = #val + if len > 0 then + for i = 1, len do + parts[i] = dumpValue(val[i], depth + 1, seen) + end + else + for k, v in pairs(val) do + local key = type(k) == "string" and k or ("[" .. tostring(k) .. "]") + parts[#parts + 1] = key .. " = " .. dumpValue(v, depth + 1, seen) + end + end + seen[val] = nil + if #parts == 0 then return "{}" end + return "{ " .. table.concat(parts, ", ") .. " }" + else + return "<" .. t .. ">" + end +end + +--- Pretty-print any Lua value to a string. +function utils.dump(val) + return dumpValue(val, 0, {}) +end + +--- Call a function, capturing any error. Returns (result, nil) on success or (nil, err) on failure. +--- Extra arguments are forwarded to the callback, like pcall. +function utils.try(callback, ...) + if type(callback) ~= "function" then + error("utils.try: callback is not a function (got " .. type(callback) .. ")") + end + local ok, result = pcall(callback, ...) + if ok then return result, nil end + if result == nil then result = NIL_ERROR_PLACEHOLDER end + return nil, result +end + +local TRYN_MAX_COUNT = 64 + +--- Like utils.try but for functions that return N values. +--- Returns (v1, ..., vN, nil) on success or (nil, ..., nil, err) on failure. +function utils.tryn(expectedCount, callback, ...) + local count = math.tointeger(expectedCount) + if count == nil then error("utils.tryn: expectedCount must be an integer number") end + expectedCount = count + if expectedCount < 0 then error("utils.tryn: expectedCount must not be negative") end + if expectedCount > TRYN_MAX_COUNT then + error("utils.tryn: at most " .. TRYN_MAX_COUNT .. " return values are supported") + end + if type(callback) ~= "function" then + error("utils.tryn: callback is not a function (got " .. type(callback) .. ")") + end + local results = table.pack(pcall(callback, ...)) + if results[1] then + results[expectedCount + 2] = nil + return table.unpack(results, 2, expectedCount + 2) + end + local err = results[2] + if err == nil then err = NIL_ERROR_PLACEHOLDER end + local out = {} + out[expectedCount + 1] = err + return table.unpack(out, 1, expectedCount + 1) +end diff --git a/lua/test.lua b/lua/test.lua new file mode 100644 index 0000000..d9b6711 --- /dev/null +++ b/lua/test.lua @@ -0,0 +1,53 @@ +-- Smoke-test for the stdlib extensions. + +print("=== math ===") +print("round(2.5) =", math.round(2.5)) -- 3 +print("round(2.567,2) =", math.round(2.567, 2)) -- 2.57 +print("clamp(10,0,5) =", math.clamp(10, 0, 5)) -- 5 +print("isFinite(1/0) =", math.isFinite(1/0)) -- false +print("isFinite(3.14) =", math.isFinite(3.14)) -- true +print("sign(-7) =", math.sign(-7)) -- -1 +print("scale(5,0,10,0,100) =", math.scale(5, 0, 10, 0, 100)) -- 50.0 + +print("\n=== table ===") +local t = {3, 1, 4, 1, 5} +print("sum =", table.sum(t)) -- 14 +print("min =", table.min(t)) -- 1 +print("max =", table.max(t)) -- 5 +print("mean =", table.mean(t)) -- 2.8 +local evens = table.ifilter(t, function(v) return v % 2 == 0 end) +print("evens =", table.concat(evens, ",")) -- 4 +local doubled = table.map({1,2,3}, function(v) return v * 2 end) +print("doubled=", table.concat(doubled, ",")) -- 2,4,6 +print("deepCopy ok:", table.deepCopy({x={y=1}}).x.y == 1) +print("merged =", table.concat(table.merge({1,2},{3,4}), ",")) -- 1,2,3,4 + +print("\n=== utils ===") +print("dump(nil) =", utils.dump(nil)) +print("dump({1,2}) =", utils.dump({1, 2})) +print("dump({x=1}) =", utils.dump({x = 1})) +print("isNull(NULL) =", utils.isNull(utils.NULL)) +print("isNull(nil) =", utils.isNull(nil)) + +local json = utils.toJSON({name="Alice", age=30, tags={"a","b"}}) +print("toJSON =", json) +local parsed = utils.fromJSON(json) +print("fromJSON name=", parsed.name, "age=", parsed.age) + +local v, err = utils.try(function() return 42 end) +print("try ok: v=", v, "err=", err) +local v2, err2 = utils.try(function() error("oops") end) +print("try err: v=", v2, "err ~= nil:", err2 ~= nil) + +print("\n=== os ===") +local t1 = os.microtime() +os.sleep(0.01) +local t2 = os.microtime() +print("microtime ok:", t2 > t1) +print("clock >= 0:", os.clock() >= 0) + +print("\n=== log (set RUST_LOG=info to see output on stderr) ===") +log.info("hello from log.info") +log.warn("hello from log.warn") + +print("\nAll checks passed.") diff --git a/src/main.rs b/src/main.rs new file mode 100644 index 0000000..1d56989 --- /dev/null +++ b/src/main.rs @@ -0,0 +1,42 @@ +use std::path::PathBuf; + +use clap::Parser; + +mod sandbox; +mod stdlib; + +/// Runs a Lua script in a customized environment +#[derive(Parser, Debug)] +#[command(version, about)] +struct Args { + /// Path to the Lua script to execute + filepath: PathBuf, +} + +#[tokio::main] +async fn main() -> Result<(), Box> { + env_logger::Builder::from_env(env_logger::Env::default().default_filter_or("warn")).init(); + + let args = Args::parse(); + + let source = tokio::fs::read_to_string(&args.filepath).await?; + + // Skip a leading shebang line like stock Lua's luaL_loadfilex does (it + // skips any first line starting with '#'). The newline is kept so error + // messages still report correct line numbers. + let chunk = if source.starts_with('#') { + &source[source.find('\n').unwrap_or(source.len())..] + } else { + source.as_str() + }; + + let lua = sandbox::create_sandboxed_lua()?; + + lua.load(chunk) + // "@" marks the chunk name as a file path in error messages / tracebacks + .set_name(format!("@{}", args.filepath.display())) + .exec_async() + .await?; + + Ok(()) +} diff --git a/src/sandbox.rs b/src/sandbox.rs new file mode 100644 index 0000000..0a2b825 --- /dev/null +++ b/src/sandbox.rs @@ -0,0 +1,117 @@ +use std::cell::RefCell; +use std::time::Instant; + +use mlua::prelude::{LuaResult, LuaTable, LuaValue}; +use mlua::{Lua, LuaOptions, StdLib}; + +use crate::stdlib; + +/// Creates a Lua state sandboxed after the model of Luau's safe environment: +/// io, package and debug are not loaded, os is reduced to its time functions, +/// and bytecode/chunk-loading escape hatches are removed from base and string. +pub(crate) fn create_sandboxed_lua() -> LuaResult { + let libs = StdLib::COROUTINE + | StdLib::TABLE + | StdLib::STRING + | StdLib::UTF8 + | StdLib::MATH + | StdLib::OS; + let lua = Lua::new_with(libs, LuaOptions::default())?; + + let globals = lua.globals(); + + // Remove filesystem-access functions and `load` which works with raw bytecode. + for name in ["dofile", "loadfile", "load"] { + globals.set(name, mlua::Nil)?; + } + + // Patch std libs + patch_string(&lua, &globals)?; + patch_os(&lua, &globals)?; + patch_collectgarbage(&lua, &globals)?; + install_warning_handler(&lua); + + stdlib::install(&lua)?; + + Ok(lua) +} + +/// Installs a warning handler matching the one stock Lua sets in `luaL_newstate` +/// (mlua builds the state with `lua_newstate`, which leaves it unset, making +/// `warn` a silent no-op): prints "Lua warning: " to stderr, toggled by +/// the `warn("@off")` / `warn("@on")` control messages. Warnings start ON, +/// the Lua 5.5 default (5.4 started them off). +fn install_warning_handler(lua: &Lua) { + struct WarnState { + enabled: bool, + // multi-arg warn() arrives as one piece per argument; buffer until the last + buffer: String, + } + let state = RefCell::new(WarnState { + enabled: true, + buffer: String::new(), + }); + + lua.set_warning_function(move |_, msg, tocont| { + let mut st = state.borrow_mut(); + // Control messages: a complete, single-piece message starting with '@' + if !tocont && st.buffer.is_empty() && msg.starts_with('@') { + match msg { + "@on" => st.enabled = true, + "@off" => st.enabled = false, + _ => {} // unknown control messages are ignored, as in stock Lua + } + return Ok(()); + } + st.buffer.push_str(msg); + if !tocont { + if st.enabled { + eprintln!("Lua warning: {}", st.buffer); + } + st.buffer.clear(); + } + Ok(()) + }); +} + +/// Patch the string table to remove "dump" +fn patch_string<'lua>(_lua: &'lua Lua, globals: &'lua LuaTable) -> LuaResult<()> { + // string.dump produces bytecode (the counterpart of load). + globals.get::("string")?.set("dump", mlua::Nil)?; + Ok(()) +} + +/// Patch the "os" table by removing non-time utils, and changing os.clock() to return monotonic clock (secs float) +fn patch_os<'lua>(lua: &'lua Lua, globals: &'lua LuaTable) -> LuaResult<()> { + // os: keep only the time functions Luau provides; drops execute, exit, + // getenv, remove, rename, setlocale and tmpname. + let os_table: LuaTable = globals.get("os")?; + let safe_os = lua.create_table()?; + for name in ["date", "difftime", "time"] { + safe_os.set(name, os_table.get::(name)?)?; + } + + // os.clock measures wall time since script start instead of process CPU time. + let start = Instant::now(); + let clock = lua.create_function(move |_, ()| Ok(start.elapsed().as_secs_f64()))?; + safe_os.set("clock", clock)?; + + globals.set("os", safe_os)?; + Ok(()) +} + +/// Patch `collectgarbage` to only allow "count" - returning heap size +fn patch_collectgarbage<'lua>(lua: &'lua Lua, globals: &'lua LuaTable) -> LuaResult<()> { + // collectgarbage: like Luau, only the "count" option is allowed. + let collectgarbage = lua.create_function(|lua, opt: Option| { + if opt.as_deref() == Some("count") { + Ok(lua.used_memory() as f64 / 1024.0) + } else { + Err(mlua::Error::runtime( + "collectgarbage is sandboxed; only collectgarbage(\"count\") is allowed", + )) + } + })?; + globals.set("collectgarbage", collectgarbage)?; + Ok(()) +} diff --git a/src/stdlib/logging.rs b/src/stdlib/logging.rs new file mode 100644 index 0000000..7d4f8ee --- /dev/null +++ b/src/stdlib/logging.rs @@ -0,0 +1,57 @@ +use mlua::prelude::LuaResult; +use mlua::{Lua, Table as LuaTable, Value as LuaValue, Variadic}; + +fn args_to_string(lua: &Lua, args: Variadic) -> LuaResult { + let tostring: mlua::Function = lua.globals().get("tostring")?; + let parts: Vec = args + .into_iter() + .map(|v| tostring.call::(v).unwrap_or_else(|_| "?".to_string())) + .collect(); + Ok(parts.join("\t")) +} + +pub(super) fn install(lua: &Lua) -> LuaResult<()> { + let log: LuaTable = lua.create_table()?; + + log.raw_set( + "trace", + lua.create_function(|lua, args: Variadic| { + ::log::trace!("{}", args_to_string(lua, args)?); + Ok(()) + })?, + )?; + + log.raw_set( + "debug", + lua.create_function(|lua, args: Variadic| { + ::log::debug!("{}", args_to_string(lua, args)?); + Ok(()) + })?, + )?; + + log.raw_set( + "info", + lua.create_function(|lua, args: Variadic| { + ::log::info!("{}", args_to_string(lua, args)?); + Ok(()) + })?, + )?; + + let warn_fn = lua.create_function(|lua, args: Variadic| { + ::log::warn!("{}", args_to_string(lua, args)?); + Ok(()) + })?; + log.raw_set("warn", warn_fn.clone())?; + log.raw_set("warning", warn_fn)?; + + log.raw_set( + "error", + lua.create_function(|lua, args: Variadic| { + ::log::error!("{}", args_to_string(lua, args)?); + Ok(()) + })?, + )?; + + lua.globals().raw_set("log", log)?; + Ok(()) +} diff --git a/src/stdlib/math.rs b/src/stdlib/math.rs new file mode 100644 index 0000000..b1f0b06 --- /dev/null +++ b/src/stdlib/math.rs @@ -0,0 +1,5 @@ +const MATH_LUA: &str = include_str!("../../lua/stdlib/math.lua"); + +pub(super) fn install(lua: &mlua::Lua) -> mlua::Result<()> { + lua.load(MATH_LUA).set_name("@[stdlib/math]").exec() +} diff --git a/src/stdlib/mod.rs b/src/stdlib/mod.rs new file mode 100644 index 0000000..127fee8 --- /dev/null +++ b/src/stdlib/mod.rs @@ -0,0 +1,14 @@ +mod logging; +mod math; +mod os_ext; +mod table; +pub(crate) mod utils; + +pub(crate) fn install(lua: &mlua::Lua) -> mlua::Result<()> { + math::install(lua)?; + table::install(lua)?; + utils::install(lua)?; + os_ext::install(lua)?; + logging::install(lua)?; + Ok(()) +} diff --git a/src/stdlib/os_ext.rs b/src/stdlib/os_ext.rs new file mode 100644 index 0000000..f7901f8 --- /dev/null +++ b/src/stdlib/os_ext.rs @@ -0,0 +1,36 @@ +use std::time::{Duration, SystemTime, UNIX_EPOCH}; + +use mlua::prelude::LuaResult; +use mlua::{Lua, Table as LuaTable}; + +/// Extend the already-sandboxed `os` table with non-standard additions. +pub(super) fn install(lua: &Lua) -> LuaResult<()> { + let os: LuaTable = lua.globals().get("os")?; + + // os.microtime() — Unix timestamp as f64 with sub-second precision. + os.raw_set( + "microtime", + lua.create_function(|_, ()| { + SystemTime::now() + .duration_since(UNIX_EPOCH) + .map(|d| d.as_secs_f64()) + .map_err(|e| mlua::Error::external(format!("os.microtime: {e}"))) + })?, + )?; + + // os.sleep(seconds) — yields the Lua coroutine via tokio; does not block the thread. + os.raw_set( + "sleep", + lua.create_async_function(|_, seconds: f64| async move { + let duration = Duration::try_from_secs_f64(seconds).map_err(|_| { + mlua::Error::external( + "os.sleep: duration must be a non-negative finite number of seconds", + ) + })?; + tokio::time::sleep(duration).await; + Ok(()) + })?, + )?; + + Ok(()) +} diff --git a/src/stdlib/table.rs b/src/stdlib/table.rs new file mode 100644 index 0000000..6377a1a --- /dev/null +++ b/src/stdlib/table.rs @@ -0,0 +1,5 @@ +const TABLE_LUA: &str = include_str!("../../lua/stdlib/table.lua"); + +pub(super) fn install(lua: &mlua::Lua) -> mlua::Result<()> { + lua.load(TABLE_LUA).set_name("@[stdlib/table]").exec() +} diff --git a/src/stdlib/utils.rs b/src/stdlib/utils.rs new file mode 100644 index 0000000..ad9b13a --- /dev/null +++ b/src/stdlib/utils.rs @@ -0,0 +1,171 @@ +use std::ffi::c_void; + +use mlua::prelude::LuaResult; +use mlua::{LightUserData, Lua, Value as LuaValue}; +use serde_json; + +const UTILS_LUA: &str = include_str!("../../lua/stdlib/utils.lua"); + +// A stable address used as the identity of utils.NULL. +static NULL_MARKER: u8 = 0; + +fn null_lud() -> LightUserData { + LightUserData(std::ptr::addr_of!(NULL_MARKER) as *mut c_void) +} + +pub(crate) fn is_null(val: &LuaValue) -> bool { + matches!(val, LuaValue::LightUserData(p) if *p == null_lud()) +} + +// --------------------------------------------------------------------------- +// Lua → JSON +// --------------------------------------------------------------------------- + +fn lua_to_json(val: LuaValue, depth: u32) -> LuaResult { + const MAX_DEPTH: u32 = 64; + if depth > MAX_DEPTH { + return Err(mlua::Error::external("utils.toJSON: nesting too deep (max 64 levels)")); + } + if is_null(&val) { + return Ok(serde_json::Value::Null); + } + match val { + LuaValue::Nil => Ok(serde_json::Value::Null), + LuaValue::Boolean(b) => Ok(serde_json::Value::Bool(b)), + LuaValue::Integer(i) => Ok(serde_json::Value::Number(i.into())), + LuaValue::Number(f) => serde_json::Number::from_f64(f) + .map(serde_json::Value::Number) + .ok_or_else(|| { + mlua::Error::external("utils.toJSON: NaN and Infinity cannot be serialized as JSON") + }), + LuaValue::String(s) => Ok(serde_json::Value::String(s.to_str()?.to_owned())), + LuaValue::Table(t) => table_to_json(t, depth), + other => Err(mlua::Error::external(format!( + "utils.toJSON: cannot serialize value of type '{}'", + other.type_name() + ))), + } +} + +fn table_to_json(t: mlua::Table, depth: u32) -> LuaResult { + let seq_len = t.raw_len() as usize; + + // Try array serialization: every key must be a sequential integer in 1..=seq_len. + if seq_len > 0 { + let mut is_pure_seq = true; + let mut total = 0usize; + for pair in t.clone().pairs::() { + let (k, _) = pair?; + total += 1; + match k { + LuaValue::Integer(i) if i >= 1 && (i as usize) <= seq_len => {} + _ => { + is_pure_seq = false; + break; + } + } + } + if is_pure_seq && total == seq_len { + let mut arr = Vec::with_capacity(seq_len); + for i in 1i64..=(seq_len as i64) { + let v: LuaValue = t.raw_get(i)?; + arr.push(lua_to_json(v, depth + 1)?); + } + return Ok(serde_json::Value::Array(arr)); + } + } + + // Object serialization — only string and integer keys are supported. + let mut map = serde_json::Map::new(); + for pair in t.pairs::() { + let (k, v) = pair?; + let key = match k { + LuaValue::String(s) => s.to_str()?.to_owned(), + LuaValue::Integer(i) => i.to_string(), + other => { + return Err(mlua::Error::external(format!( + "utils.toJSON: table key of type '{}' cannot be used as a JSON object key", + other.type_name() + ))) + } + }; + map.insert(key, lua_to_json(v, depth + 1)?); + } + Ok(serde_json::Value::Object(map)) +} + +// --------------------------------------------------------------------------- +// JSON → Lua +// --------------------------------------------------------------------------- + +fn json_to_lua(lua: &Lua, val: serde_json::Value) -> LuaResult { + match val { + serde_json::Value::Null => Ok(LuaValue::LightUserData(null_lud())), + serde_json::Value::Bool(b) => Ok(LuaValue::Boolean(b)), + serde_json::Value::Number(n) => { + if let Some(i) = n.as_i64() { + Ok(LuaValue::Integer(i)) + } else { + Ok(LuaValue::Number(n.as_f64().unwrap_or(f64::NAN))) + } + } + serde_json::Value::String(s) => Ok(LuaValue::String(lua.create_string(s.as_bytes())?)), + serde_json::Value::Array(arr) => { + let t = lua.create_table()?; + for (i, v) in arr.into_iter().enumerate() { + t.raw_set(i + 1, json_to_lua(lua, v)?)?; + } + Ok(LuaValue::Table(t)) + } + serde_json::Value::Object(obj) => { + let t = lua.create_table()?; + for (k, v) in obj { + t.raw_set(k, json_to_lua(lua, v)?)?; + } + Ok(LuaValue::Table(t)) + } + } +} + +// --------------------------------------------------------------------------- +// Installation +// --------------------------------------------------------------------------- + +pub(super) fn install(lua: &Lua) -> LuaResult<()> { + let utils = lua.create_table()?; + + utils.raw_set("NULL", LuaValue::LightUserData(null_lud()))?; + + utils.raw_set( + "isNull", + lua.create_function(|_, val: LuaValue| Ok(is_null(&val)))?, + )?; + + utils.raw_set( + "toJSON", + lua.create_function(|_, (val, pretty): (LuaValue, Option)| { + let json = lua_to_json(val, 0)?; + let s = if pretty.unwrap_or(false) { + serde_json::to_string_pretty(&json) + } else { + serde_json::to_string(&json) + } + .map_err(mlua::Error::external)?; + Ok(s) + })?, + )?; + + utils.raw_set( + "fromJSON", + lua.create_function(|lua, s: String| { + let json: serde_json::Value = serde_json::from_str(&s) + .map_err(|e| mlua::Error::external(format!("utils.fromJSON: {e}")))?; + json_to_lua(lua, json) + })?, + )?; + + lua.globals().raw_set("utils", utils)?; + + // Lua side adds: utils.dump, utils.try, utils.tryn + lua.load(UTILS_LUA).set_name("@[stdlib/utils]").exec() +}