mirror of
https://github.com/storytold/vectorcraft.git
synced 2026-11-09 22:22:07 +00:00
dotCooCoo
66a01584ae
A filter manifest that lists `inputs` must now list `doc.read` in `permissions`, so installing it asks the user to grant them and the Additional Plug-ins Folder loads it only once granted. Left out, the manifest does not install. The pixels of all images in one filter input take at most 16 MiB of base64, and the runs and paragraphs of all its type at most 16 MiB of JSON. An image whose pixels do not fit what is left comes with `pixelsOmitted`, checked before it is decoded, and type that does not fit comes with `truncated`. The read-only objects are kept once and written into the input from there. A field a filter adds to a read-only object is named in the refusal with control and bidirectional characters escaped, cut to 64 characters.
424 lines
20 KiB
Rust
424 lines
20 KiB
Rust
//! Untrusted plug-ins never crash the app: mutated and garbage modules handed to `plugin.install`,
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//! and plug-ins returning hostile output (random JSON in the object model's shape: huge or
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//! malformed coordinates, unknown ids, broken paints and gradients, junk of every type) as object
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//! filters (`plugin.run`) or live effects (`effect.apply`). Each run must end as an error that
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//! leaves the document as it was, or as a document that then renders and exports, without a
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//! panic.
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//!
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//! `PROPTEST_CASES=2000 cargo test -p vectorcraft-engine --test plugin_fuzz` runs a deeper search.
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// Integration tests: unwrapping and panicking on failure is fine here, unlike in shipped code (AGENTS.md › Robustness).
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#![allow(clippy::unwrap_used, clippy::expect_used, clippy::panic)]
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use proptest::prelude::*;
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use serde_json::{Map, Value, json};
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use vectorcraft_engine::Session;
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use vectorcraft_plugins::wat as tpl;
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use vectorcraft_testkit::catch_quiet;
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use vectorcraft_testkit::fixtures::rich_session;
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const DESATURATE: &[u8] = include_bytes!("../../plugins/tests/fixtures/desaturate.wasm");
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/// 64 cases each, unless `PROPTEST_CASES` asks for more.
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fn config() -> ProptestConfig {
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let mut c = ProptestConfig { failure_persistence: None, ..ProptestConfig::default() };
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if std::env::var_os("PROPTEST_CASES").is_none() {
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c.cases = 64;
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}
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c
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}
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fn install(s: &mut Session, wasm: &[u8]) -> Result<Value, String> {
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s.execute("plugin.install", &json!({"dataBase64": vectorcraft_format::base64_encode(wasm)})).map_err(|e| e.to_string())
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}
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/// The document renders and exports without panicking.
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fn renders(s: &Session, what: &str) -> Result<(), TestCaseError> {
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let d = &s.doc().unwrap().doc;
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let r = catch_quiet(|| {
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let mut r = vectorcraft_render::Renderer::new();
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if let Some(ab) = d.artboards.first() {
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let _ = r.render_region(d, ab.rect, 0.25, true).to_png();
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}
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let _ = vectorcraft_svg::export(d, &vectorcraft_svg::ExportOptions::default());
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let _ = vectorcraft_engine::export_pdf(d, &vectorcraft_pdf::PdfOptions::default());
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let _ = vectorcraft_format::save_file(d);
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});
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r.map_err(|msg| TestCaseError::fail(format!("{what}: panicked: {msg}")))
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}
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/// Junk of every JSON type.
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fn arb_junk() -> impl Strategy<Value = Value> {
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let leaf = prop_oneof![
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Just(Value::Null),
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any::<bool>().prop_map(Value::from),
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any::<i64>().prop_map(Value::from),
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(-1e3f64..1e3).prop_map(Value::from),
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"[a-zA-Z#]{0,6}".prop_map(Value::from),
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];
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leaf.prop_recursive(2, 12, 3, |inner| {
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prop_oneof![
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prop::collection::vec(inner.clone(), 0..3).prop_map(Value::Array),
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prop::collection::btree_map("[a-z]{1,5}", inner, 0..3).prop_map(|m| Value::Object(m.into_iter().collect())),
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]
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})
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}
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/// Numbers that tend to break arithmetic.
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fn arb_num() -> impl Strategy<Value = Value> {
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prop_oneof![
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6 => (-600.0f64..600.0).prop_map(Value::from),
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1 => Just(json!(0)),
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1 => Just(json!(-0.0)),
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1 => Just(json!(1e308)),
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1 => Just(json!(-1e308)),
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1 => Just(json!(4.0e6)),
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1 => Just(json!(4.000001e6)),
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1 => Just(json!(1e-308)),
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1 => Just(json!(u64::MAX)),
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1 => Just(json!(i64::MIN)),
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1 => arb_junk(),
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]
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}
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fn arb_point() -> impl Strategy<Value = Value> {
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prop_oneof![
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8 => (arb_num(), arb_num()).prop_map(|(x, y)| json!([x, y])),
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1 => (arb_num(), arb_num()).prop_map(|(x, y)| json!({"x": x, "y": y})),
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1 => arb_junk(),
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]
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}
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fn arb_path() -> impl Strategy<Value = Value> {
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let anchor = (
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arb_point(),
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prop::option::of(arb_point()),
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prop::option::of(arb_point()),
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prop::option::of(prop_oneof![Just("Smooth"), Just("Corner"), Just("Weird")]),
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)
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.prop_map(|(p, i, o, k)| {
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let mut a = json!({"p": p});
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if let Some(i) = i {
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a["in"] = i;
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}
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if let Some(o) = o {
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a["out"] = o;
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}
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if let Some(k) = k {
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a["kind"] = json!(k);
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}
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a
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});
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let sub = (prop::collection::vec(anchor, 0..6), any::<bool>()).prop_map(|(anchors, closed)| json!({"anchors": anchors, "closed": closed}));
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prop_oneof![9 => prop::collection::vec(sub, 0..3).prop_map(|s| json!({"subpaths": s})), 1 => arb_junk()]
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}
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fn arb_color() -> impl Strategy<Value = Value> {
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prop_oneof![
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(arb_num(), arb_num(), arb_num()).prop_map(|(r, g, b)| json!({"model": "rgb", "r": r, "g": g, "b": b})),
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(arb_num(), arb_num(), arb_num(), arb_num()).prop_map(|(c, m, y, k)| json!({"model": "cmyk", "c": c, "m": m, "y": y, "k": k})),
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arb_num().prop_map(|k| json!({"model": "gray", "k": k})),
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(arb_num(), arb_num(), arb_num()).prop_map(|(l, a, b)| json!({"model": "lab", "l": l, "a": a, "b": b})),
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arb_junk(),
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]
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}
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fn arb_paint() -> impl Strategy<Value = Value> {
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let stop = (arb_num(), arb_color(), arb_num(), arb_num()).prop_map(|(o, c, a, m)| json!({"offset": o, "color": c, "opacity": a, "midpoint": m}));
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let freeform = (
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prop::collection::vec((arb_point(), arb_color(), arb_num()).prop_map(|(at, c, s)| json!({"at": at, "color": c, "spread": s})), 0..3),
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arb_junk(),
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)
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.prop_map(|(points, lines)| json!({"points": points, "lines": if lines.is_array() { lines } else { json!([[0, 1, 9]]) }}));
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let gradient = (
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prop_oneof![Just("Linear"), Just("Radial"), Just("Freeform"), Just("Conic")],
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prop::collection::vec(stop, 0..4),
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prop::option::of((arb_point(), arb_point(), arb_num(), prop::option::of(arb_point()))),
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arb_num(),
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prop::option::of(freeform),
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)
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.prop_map(|(kind, stops, geom, angle, ff)| {
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let mut g = json!({"type": "gradient", "gradient": {"kind": kind, "stops": stops}, "angle": angle});
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if let Some((start, end, aspect, focal)) = geom {
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g["geom"] = json!({"start": start, "end": end, "aspect": aspect, "focal": focal});
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}
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if let Some(ff) = ff {
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g["freeform"] = ff;
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}
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g
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});
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prop_oneof![
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2 => Just(Value::Null),
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3 => (arb_color(), prop::option::of(prop_oneof![Just("White"), Just("Nope")]), arb_num())
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.prop_map(|(c, sw, t)| json!({"type": "solid", "color": c, "swatch": sw, "tint": t})),
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3 => gradient,
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1 => (prop_oneof![Just("Nope"), Just("")], prop::collection::vec(arb_num(), 6)).prop_map(|(p, xf)| json!({"type": "pattern", "pattern": p, "xf": xf})),
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1 => Just(json!({"type": "none"})),
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1 => arb_junk(),
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]
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}
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/// An output object: an input object's id (by index into the inputs) or a random one, and any of
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/// the object keys.
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fn arb_object() -> impl Strategy<Value = (Option<usize>, Value)> {
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let stroke = (arb_paint(), prop::option::of(arb_num())).prop_map(|(p, w)| json!({"paint": p, "width": w}));
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(
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prop::option::of(0usize..8),
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prop::option::of(prop_oneof![Just(json!("path")), Just(json!("compound")), arb_junk()]),
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prop::option::of(arb_path()),
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prop::option::of(prop_oneof![Just(json!("evenodd")), Just(json!("nonzero")), arb_junk()]),
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prop::option::of(prop::collection::vec(arb_paint(), 0..3)),
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prop::option::of(prop::collection::vec(stroke, 0..3)),
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prop::option::of(arb_num()),
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prop::option::of(prop_oneof![Just(json!("name")), arb_junk()]),
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)
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.prop_map(|(id, t, path, rule, fills, strokes, opacity, name)| {
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let mut o = Map::new();
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for (k, v) in [
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("type", t),
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("path", path),
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("fillRule", rule),
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("fills", fills.map(Value::from)),
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("strokes", strokes.map(Value::from)),
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("opacity", opacity),
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("name", name),
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] {
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if let Some(v) = v {
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o.insert(k.into(), v);
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}
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}
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(id, Value::Object(o))
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})
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}
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/// The output document: objects (ids resolved against `inputs`; out-of-range indices become
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/// unknown ids), or junk.
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fn output(objects: &[(Option<usize>, Value)], inputs: &[u64], junk: Option<Value>) -> String {
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if let Some(j) = junk {
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return j.to_string();
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}
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let list: Vec<Value> = objects
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.iter()
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.map(|(id, o)| {
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let mut o = o.clone();
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if let Some(i) = id {
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o["id"] = json!(inputs.get(*i).copied().unwrap_or(9_999_999 + *i as u64));
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}
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o
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})
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.collect();
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json!({ "objects": list }).to_string()
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}
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proptest! {
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#![proptest_config(config())]
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#[test]
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fn hostile_filter_and_effect_output_never_crashes(
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objects in prop::collection::vec(arb_object(), 0..5),
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junk in prop::option::weighted(0.1, arb_junk()),
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effect in any::<bool>(),
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) {
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let mut s = rich_session();
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s.execute("select.all", &json!({})).unwrap();
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let st = s.doc().unwrap();
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let inputs: Vec<u64> = vectorcraft_plugins::objects::filter_targets(&st.doc, &st.selection.objects).iter().map(|i| i.0).collect();
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let out = output(&objects, &inputs, junk);
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let id = if effect { "fuzz.effect" } else { "fuzz.filter" };
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let src = tpl::returning(&tpl::manifest(id, if effect { "effect" } else { "filter" }, "{}"), &out);
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install(&mut s, &wat::parse_str(src).unwrap()).unwrap();
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let before = s.doc().unwrap().doc.clone();
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let r = catch_quiet(|| {
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if effect {
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s.execute("effect.apply", &json!({"effect": format!("plugin.{id}")})).map(|_| ())
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} else {
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s.execute("plugin.run", &json!({"id": id})).map(|_| ())
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}
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});
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match r {
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Err(msg) => return Err(TestCaseError::fail(format!("panicked on {out}: {msg}"))),
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Ok(Err(_)) => prop_assert!(s.doc().unwrap().doc == before, "a failed run changed the document: {}", out),
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Ok(Ok(())) => {}
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}
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renders(&s, &out)?;
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}
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#[test]
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fn mutated_and_garbage_modules_never_crash(
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flips in prop::collection::vec((any::<prop::sample::Index>(), any::<u8>()), 0..8),
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cut in prop::option::of(any::<prop::sample::Index>()),
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garbage in prop::collection::vec(any::<u8>(), 0..64),
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) {
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let mut bytes = DESATURATE.to_vec();
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for (i, b) in &flips {
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let i = i.index(bytes.len());
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bytes[i] = *b;
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}
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if let Some(c) = cut {
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bytes.truncate(c.index(bytes.len()));
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}
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let mut s = rich_session();
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s.execute("select.all", &json!({})).unwrap();
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for module in [bytes, [b"\0asm\x01\0\0\0".as_slice(), &garbage].concat(), garbage.clone()] {
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let r = catch_quiet(|| {
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if let Ok(info) = install(&mut s, &module) {
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let _ = s.execute("plugin.run", &json!({"id": info["id"]}));
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}
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});
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prop_assert!(r.is_ok(), "panicked: {:?}", r.err());
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}
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renders(&s, "after mutated modules")?;
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}
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/// Manifests with hostile `permissions`, `api` and names (unknown, reserved and repeated
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/// permissions, junk of every type, control and bidirectional override characters) parse to
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/// an error or to a manifest whose permissions fit its kind, and installing one with a junk
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/// `grant` ends as an error or an install, never a panic. A prompt never shows a hidden
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/// character from the name.
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#[test]
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fn hostile_manifest_permissions_never_crash(
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kind in prop::sample::select(vec!["filter", "effect", "exporter"]),
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names in prop::collection::vec(
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prop_oneof![
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prop::sample::select(vec!["doc.read", "doc.write", "state", "effect.render", "export.write", "progress", "ui.panel", ""]),
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Just("doc.read\u{202E}"),
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Just("\u{0007}"),
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],
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0..6,
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),
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permissions in prop::option::weighted(0.8, prop_oneof![Just(Value::Null), arb_junk()]),
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api in prop_oneof![2 => Just(json!(1)), 1 => Just(json!(2)), 1 => arb_junk()],
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name in prop_oneof![3 => "[a-z\u{202E}\u{2066}\u{200F} ]{1,64}", 1 => "[a-z\u{202E}\u{2066}\u{0007}\u{200F} ]{1,80}"],
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grant in prop_oneof![Just(Value::Null), arb_junk(), Just(json!(["doc.read", "doc.write", "state", "effect.render", "export.write", "progress"]))],
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) {
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let mut m = json!({"id": "fuzz.permissions", "name": name, "kind": kind, "api": api});
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if kind == "exporter" {
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m["extensions"] = json!(["fz"]);
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}
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m["permissions"] = match permissions {
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Some(Value::Null) | None => json!(names),
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Some(junk) => junk,
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};
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let text = m.to_string();
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let parsed = catch_quiet(|| vectorcraft_plugins::Manifest::parse(text.as_bytes()));
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let parsed = parsed.map_err(|msg| TestCaseError::fail(format!("panicked on {text}: {msg}")))?;
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if let Ok(man) = &parsed {
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prop_assert!(man.permissions().iter().all(|p| p.applies(man.kind)), "{}", text);
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let shown = vectorcraft_plugins::permissions::display_text(&man.name, vectorcraft_plugins::permissions::MAX_SHOWN_NAME);
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prop_assert!(!shown.chars().any(|c| c.is_control() || matches!(c, '\u{202E}' | '\u{2066}' | '\u{200F}')), "{}", shown);
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prop_assert!(shown.chars().count() <= vectorcraft_plugins::permissions::MAX_SHOWN_NAME);
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}
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let mut s = rich_session();
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let module = wat::parse_str(tpl::returning(&text, r#"{"objects":[]}"#)).unwrap();
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let data = vectorcraft_format::base64_encode(&module);
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let r = catch_quiet(|| {
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let _ = s.execute("plugin.inspect", &json!({"dataBase64": data}));
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s.execute("plugin.install", &json!({"dataBase64": data, "grant": grant})).is_ok()
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});
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let installed = r.map_err(|msg| TestCaseError::fail(format!("panicked installing {text}: {msg}")))?;
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prop_assert!(!installed || parsed.is_ok(), "a manifest that doesn't parse installed: {}", text);
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vectorcraft_plugins::registry::remove("fuzz.permissions");
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vectorcraft_plugins::registry::revoke("fuzz.permissions");
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}
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/// A plug-in of API level 2 that calls the host imports with hostile arguments (any progress
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/// counts, any log level, pointers and lengths in and out of its memory, text that isn't
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/// UTF-8) runs to an error or an output, never a panic, and its report stays within the caps.
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#[test]
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fn hostile_host_import_arguments_never_crash(
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calls in prop::collection::vec(
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prop_oneof![
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(any::<i64>(), any::<i64>()).prop_map(|(d, t)| format!("(call $vc_progress (i64.const {d}) (i64.const {t}))")),
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Just("(drop (call $vc_cancelled))".to_string()),
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(prop_oneof![any::<i32>(), -1..5i32], prop_oneof![any::<i32>(), 0x1ff00..0x20100i32], prop_oneof![any::<i32>(), 0..5000i32])
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.prop_map(|(l, p, n)| format!("(drop (call $vc_log (i32.const {l}) (i32.const {p}) (i32.const {n})))")),
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],
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0..24,
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),
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bytes in prop::collection::vec(any::<u8>(), 0..64),
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effect in any::<bool>(),
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) {
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use vectorcraft_plugins::host::{LOG_TRUNCATED, MAX_LOG_BYTES, MAX_LOG_LINE, MAX_LOG_LINES};
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let manifest = if effect {
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r#"{"id":"fuzz.host","name":"F","kind":"effect","api":2,"permissions":["doc.read","effect.render","progress"]}"#
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} else {
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r#"{"id":"fuzz.host","name":"F","kind":"filter","api":2,"permissions":["doc.read","doc.write","progress"]}"#
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};
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let text: String = bytes.iter().map(|b| format!("\\{b:02x}")).collect();
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let imports = format!(r#"{} (data (i32.const 0x2000) "{text}")"#, tpl::HOST_IMPORTS);
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let wasm = wat::parse_str(tpl::with_imports(manifest, &imports, &calls.concat(), r#"{"objects":[]}"#)).unwrap();
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let r = catch_quiet(|| {
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let p = vectorcraft_plugins::Plugin::load(&wasm, vectorcraft_plugins::Limits::default())?;
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let token = vectorcraft_doc::cancel::CancelToken::new();
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let sink: vectorcraft_doc::cancel::ProgressSink = std::rc::Rc::new(|_, _, _| {});
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Ok::<_, vectorcraft_plugins::Error>(vectorcraft_doc::cancel::scope(&token, Some(sink), || p.run_reporting(b"{\"objects\":[]}", b"{}", p.limits())))
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});
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let r = r.map_err(|msg| TestCaseError::fail(format!("panicked on {calls:?}: {msg}")))?;
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let (out, report) = r.map_err(|e| TestCaseError::fail(format!("refused at load: {e}")))?;
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prop_assert!(out.is_ok(), "{:?}", out);
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prop_assert!(report.lines.len() <= MAX_LOG_LINES + 1);
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prop_assert!(report.lines.iter().all(|l| l.text.chars().count() <= MAX_LOG_LINE));
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prop_assert!(report.lines.iter().filter(|l| l.text != LOG_TRUNCATED).map(|l| l.text.len()).sum::<usize>() <= MAX_LOG_BYTES);
|
||
if let Some((done, total)) = report.progress {
|
||
prop_assert!(total == 0 || done <= total);
|
||
}
|
||
}
|
||
|
||
/// Manifests with hostile `inputs` (unknown, repeated and oddly cased kinds, long lists, junk of
|
||
/// every type) with any `api`, kind and permissions parse to an error or to a filter at `api` 2
|
||
/// or later asking for each kind once, whose `permissions` list `doc.read` so that installing
|
||
/// it asks for approval. One that installs and echoes its input on a document
|
||
/// with type, images and symbols leaves the document as it was, and it still renders.
|
||
#[test]
|
||
fn hostile_manifest_inputs_never_crash(
|
||
kind in prop::sample::select(vec!["filter", "effect", "exporter"]),
|
||
names in prop::collection::vec(prop::sample::select(vec!["type", "image", "symbolInstance", "Type", "text", "path", ""]), 0..6),
|
||
long in prop::option::weighted(0.1, 4usize..300),
|
||
inputs in prop::option::weighted(0.8, prop_oneof![Just(Value::Null), arb_junk()]),
|
||
api in prop_oneof![2 => Just(json!(2)), 1 => Just(json!(1)), 1 => Just(json!(3)), 1 => arb_junk()],
|
||
permissions in prop_oneof![Just(Value::Null), Just(json!([])), Just(json!(["doc.read", "doc.write"])), Just(json!(["doc.write"]))],
|
||
) {
|
||
let mut m = json!({"id": "fuzz.inputs", "name": "Inputs", "kind": kind, "api": api});
|
||
if kind == "exporter" {
|
||
m["extensions"] = json!(["fz"]);
|
||
}
|
||
if !permissions.is_null() {
|
||
m["permissions"] = permissions;
|
||
}
|
||
m["inputs"] = match (inputs, long) {
|
||
(_, Some(n)) => json!(vec!["image"; n]),
|
||
(Some(Value::Null) | None, None) => json!(names),
|
||
(Some(junk), None) => junk,
|
||
};
|
||
let text = m.to_string();
|
||
let parsed = catch_quiet(|| vectorcraft_plugins::Manifest::parse(text.as_bytes()));
|
||
let parsed = parsed.map_err(|msg| TestCaseError::fail(format!("panicked on {text}: {msg}")))?;
|
||
if let Ok(man) = &parsed {
|
||
let kinds = man.input_kinds();
|
||
prop_assert_eq!(kinds.len(), man.inputs.len(), "{}", text);
|
||
prop_assert!(kinds.iter().enumerate().all(|(i, k)| !kinds[..i].contains(k)), "{}", text);
|
||
prop_assert!(kinds.is_empty() || (man.kind == vectorcraft_plugins::Kind::Filter && man.api >= 2), "{}", text);
|
||
let reads = man.permissions.as_ref().is_some_and(|p| p.iter().any(|n| n == "doc.read"));
|
||
prop_assert!(kinds.is_empty() || (man.asks_permissions() && reads), "{}", text);
|
||
}
|
||
let mut s = rich_session();
|
||
let module = wat::parse_str(tpl::module(&text, tpl::ECHO, "", 1)).unwrap();
|
||
let data = vectorcraft_format::base64_encode(&module);
|
||
let grant = json!(["doc.read", "doc.write", "state", "effect.render", "export.write"]);
|
||
let before = s.doc().unwrap().doc.clone();
|
||
let r = catch_quiet(|| {
|
||
let installed = s.execute("plugin.install", &json!({"dataBase64": data, "grant": grant})).is_ok();
|
||
let _ = s.execute("select.all", &json!({}));
|
||
let ran = installed && s.execute("plugin.run", &json!({"id": "fuzz.inputs"})).is_ok();
|
||
(installed, ran)
|
||
});
|
||
let (installed, ran) = r.map_err(|msg| TestCaseError::fail(format!("panicked running {text}: {msg}")))?;
|
||
prop_assert!(!installed || parsed.is_ok(), "a manifest that doesn't parse installed: {}", text);
|
||
if ran {
|
||
prop_assert!(s.doc().unwrap().doc.layers == before.layers, "an echo changed the document: {}", text);
|
||
}
|
||
renders(&s, &text)?;
|
||
vectorcraft_plugins::registry::remove("fuzz.inputs");
|
||
vectorcraft_plugins::registry::revoke("fuzz.inputs");
|
||
}
|
||
}
|