Marcos Paulo
5e8020aa38
Editor previews (colour swatches, arrows, embeds), the 18 obsidian-basics tasks (find and replace with regex, back/forward, auto-pair, footnotes, folding, search operators, split view, PDF/audio/ video embeds, spelling, drag and drop, pinned tabs, settings) and round 2: ```query blocks, stacked tabs, pop-out windows, tasks ticked inside embeds, text around an embed, embeds that follow edits, block menu shortcut. New crates: notescraft-regex (linear-time engine) and notescraft-syntax. Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
242 lines
11 KiB
Rust
242 lines
11 KiB
Rust
//! Hostile input for the JSON half of the blocks crate: random alphabet soup, deep nesting,
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//! half a million escaped quotes and absurd numbers.
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//!
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//! Invariant everywhere: nothing panics, the size and nesting caps are errors, and for any input
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//! `format_json` accepts, formatting is idempotent and minifying loses nothing.
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use notescraft_blocks::{Edited, check_json, format_json, format_json_block, json_span, looks_like_json, minify_json, minify_json_block};
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use serde_json::Value;
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/// Strings in the random sweep.
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const RANDOM_CASES: usize = 3000;
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/// Longest random string, in chars.
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const RANDOM_MAX: usize = 120;
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/// Bytes of the escaped-quote monster.
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const QUOTE_PAIR: &str = "\\\"";
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/// xorshift64: deterministic, tiny, no dependency.
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struct Rng(u64);
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impl Rng {
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fn next(&mut self) -> u64 {
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let mut x = self.0;
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x ^= x << 13;
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x ^= x >> 7;
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x ^= x << 17;
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self.0 = x;
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x
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}
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/// Bytes from the JSON alphabet plus NUL and a few multi-byte shapes.
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fn text(&mut self, len: usize) -> String {
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const ALPHABET: &[char] = &[
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'{', '}', '[', ']', '"', ',', ':', ' ', '\n', '\t', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'e', 'E', '.', '+', '-', 't', 'f', 'n', 'u',
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'l', '\0', '\u{7f}', 'é', '😀', '\u{2028}', '\u{feff}',
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];
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(0..len)
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.map(|_| {
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let at = u64::try_from(ALPHABET.len()).unwrap_or(u64::MAX);
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let at = usize::try_from(self.next() % at).unwrap_or(0);
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*ALPHABET.get(at).unwrap_or(&'?')
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})
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.collect()
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}
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}
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/// One note with the hostile text as the body of a `json` code block.
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fn note(body: &str) -> String {
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format!("# n\n\n```json\n{body}\n```\n\nafter\n")
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}
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/// The edit must be exactly one splice of the old note, and the caret must be inside the new text.
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fn assert_edit_is_consistent(old: &str, edited: &Edited) {
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let (range, new) = &edited.replace;
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let head = old.get(..range.start).unwrap_or_default();
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let tail = old.get(range.end..).unwrap_or_default();
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let rebuilt = format!("{head}{new}{tail}");
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assert_eq!(rebuilt, edited.text, "the edit is one splice of the old text");
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assert!(edited.caret <= edited.text.len(), "the caret is past the text");
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assert!(edited.text.is_char_boundary(edited.caret), "the caret is not on a char boundary");
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assert!(edited.text.contains("after\n"), "the rest of the note survives");
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}
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/// Whatever the input, formatting must be idempotent and minifying must lose nothing.
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fn assert_format_properties(text: &str) {
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let Ok(formatted) = format_json(text) else { return };
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let minified = minify_json(text).unwrap_or_default();
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assert_eq!(minify_json(&formatted).unwrap_or_default(), minified, "minify(format(x)) == minify(x) for {text:.40}");
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assert_eq!(format_json(&formatted).unwrap_or_default(), formatted, "format is idempotent for {text:.40}");
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assert_eq!(serde_json::from_str::<Value>(text).ok(), serde_json::from_str::<Value>(&formatted).ok(), "same value for {text:.40}");
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assert!(check_json(&formatted).is_ok());
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}
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#[test]
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fn random_alphabet_soup_never_panics() {
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let mut rng = Rng(0x1064_5dca_9e37_79b9);
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for _ in 0..RANDOM_CASES {
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let cap = u64::try_from(RANDOM_MAX).unwrap_or(u64::MAX).saturating_add(1);
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let len = usize::try_from(rng.next() % cap).unwrap_or(0);
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let text = rng.text(len);
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let _ = check_json(&text);
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let _ = looks_like_json(&text);
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if let Some(span) = json_span(&text) {
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assert!(span.start <= span.end && span.end <= text.len(), "span out of the body: {text:.40}");
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assert!(text.is_char_boundary(span.start) && text.is_char_boundary(span.end), "span off a char boundary");
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let inner = text.get(span.clone()).unwrap_or_default();
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assert!(check_json(inner).is_ok(), "the span must hold valid JSON");
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assert!(matches!((inner.chars().next(), inner.chars().next_back()), (Some('{'), Some('}')) | (Some('['), Some(']'))));
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assert!(looks_like_json(&text));
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}
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assert_format_properties(&text);
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}
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}
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/// `{"a":{"a":...1...}}` `depth` levels deep.
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fn nest(depth: usize) -> String {
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format!("{}1{}", "{\"a\":".repeat(depth), "}".repeat(depth))
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}
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#[test]
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fn deep_nesting_is_handled_without_a_stack_overflow() {
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let deep_ok = nest(100);
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assert!(check_json(&deep_ok).is_ok(), "100 levels is valid JSON");
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assert_format_properties(&deep_ok);
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// 129 levels: valid JSON, and nothing overflows. See the ignored BUG test below: the rustdoc
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// claims serde_json's limit of 128 applies, but `IgnoredAny` skips values iteratively.
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let at_129 = nest(129);
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assert!(check_json(&at_129).is_ok(), "129 levels parses");
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assert!(check_json(&format!("{}0{}", "[".repeat(129), "]".repeat(129))).is_ok());
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assert_format_properties(&at_129);
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// Deep but small: under the byte cap, so the parser sees it and survives it.
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let deep = format!("{}0{}", "[".repeat(200_000), "]".repeat(200_000));
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assert!(deep.len() <= notescraft_blocks::MAX_JSON_BYTES, "{} bytes", deep.len());
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assert!(check_json(&deep).is_ok(), "no stack overflow on deep nesting");
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assert!(minify_json(&deep).is_ok());
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// Unbalanced nesting is an error, at any depth.
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for (open, close) in [("{", ""), ("", "}"), ("[[", "]]"), ("{\"a\":", ""), ("{\"a\": 1,", "")] {
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let junk = format!("{}{}", open.repeat(200), close);
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assert!(check_json(&junk).is_err(), "{junk:.20}");
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assert!(format_json(&junk).is_err(), "{junk:.20}");
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assert!(minify_json(&junk).is_err(), "{junk:.20}");
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}
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}
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#[test]
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#[ignore = "BUG: check_json's rustdoc says the parser's nesting limit applies, but 129 levels is accepted (IgnoredAny skips iteratively)"]
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fn nesting_over_128_is_refused() {
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let too_deep = nest(129);
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assert!(check_json(&too_deep).is_err(), "129 levels should be over serde_json's limit of 128");
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assert!(format_json(&too_deep).is_err());
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assert!(minify_json(&too_deep).is_err());
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}
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#[test]
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#[ignore = "BUG: format_json expands quadratically with depth: 2000 levels (6 KB in) already make a 4 MB string, so 1 MiB of nesting would try to build ~275 GB"]
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fn formatting_deep_json_stays_bounded() {
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let text = nest(2_000);
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let formatted = format_json(&text).unwrap_or_default();
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assert!(formatted.len() <= notescraft_blocks::MAX_JSON_BYTES, "{} bytes out of {} in", formatted.len(), text.len());
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}
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#[test]
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fn a_string_with_half_a_million_escaped_quotes_survives() {
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let text = format!("[{}]{}]", "\"", "").to_owned() + "E_PAIR.repeat(500_000) + "\"]";
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assert!(text.len() > 1_000_000 && text.len() < notescraft_blocks::MAX_JSON_BYTES, "{} bytes", text.len());
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assert!(check_json(&text).is_ok(), "a monster string is still valid JSON");
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assert_format_properties(&text);
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let formatted = format_json(&text).unwrap_or_default();
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assert_eq!(formatted.matches(QUOTE_PAIR).count(), 500_000, "no escape is lost");
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assert_eq!(minify_json(&formatted).unwrap_or_default(), minify_json(&text).unwrap_or_default());
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}
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#[test]
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fn number_spelling_survives_formatting_byte_for_byte() {
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for number in ["1e999999999", "-0", "0.1e-5", "1E5", "-0.0e0", "123456789012345678901234567890", "0", "-1.7976931348623157e308", "1e-999999"] {
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let text = format!("{{\"a\":{number},\"b\":[{number}]}}");
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let formatted = format_json(&text).unwrap_or_default();
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assert_eq!(formatted.matches(number).count(), 2, "{number} must survive byte for byte: {formatted}");
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assert_eq!(minify_json(&formatted).unwrap_or_default(), minify_json(&text).unwrap_or_default());
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assert_eq!(format_json(&formatted).unwrap_or_default(), formatted.clone());
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assert_eq!(serde_json::from_str::<Value>(&text).ok(), serde_json::from_str::<Value>(&formatted).ok(), "{number}");
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}
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assert_format_properties(r#"{"deep":[[[[{"x":1e999999999}]]]],"neg":[-0,-0.1e-5]}"#);
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}
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#[test]
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fn the_size_cap_is_an_error_and_huge_bodies_do_not_panic() {
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let over = format!("[\"{}\"]", "x".repeat(notescraft_blocks::MAX_JSON_BYTES));
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assert!(check_json(&over).is_err(), "over the size cap");
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assert!(format_json(&over).is_err() && minify_json(&over).is_err());
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assert!(!looks_like_json(&over), "an oversized block holds no offerable JSON");
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assert_eq!(json_span(&over), None);
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let under = format!("[\"{}\"]", "x".repeat(100_000));
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assert!(check_json(&under).is_ok());
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assert_format_properties(&under);
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}
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#[test]
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fn block_edits_on_hostile_bodies_never_panic_and_stay_consistent() {
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let mut rng = Rng(0x5851_f42d_4c95_7f2d);
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for case in 0..400 {
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let len = usize::try_from(rng.next() % 80).unwrap_or(0);
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let text = note(&rng.text(len));
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let formatted = format_json_block(&text, 0);
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let minified = minify_json_block(&text, 0);
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if let Ok(edited) = &formatted {
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assert_edit_is_consistent(&text, edited);
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}
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if let Ok(edited) = &minified {
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assert_edit_is_consistent(&text, edited);
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}
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if let (Ok(f), Ok(m)) = (&formatted, &minified) {
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assert_eq!(f.text, m.text, "case {case}: formatting and minifying differ");
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}
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}
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// Absurd block indices are errors, never panics; only the fence (index 1) holds JSON.
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for index in [0usize, 2, 3, 9, 10_000, usize::MAX] {
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let text = note("{\"a\":1}");
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assert!(format_json_block(&text, index).is_err(), "index {index}");
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assert!(minify_json_block(&text, index).is_err(), "index {index}");
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}
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// Hostile shapes inside a fence: backticks, new lines, nul, fences of their own.
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let bodies: Vec<String> = vec![
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"`{\"a\":1}`".to_owned(),
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"`{\"a\":${x}}`".to_owned(),
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"`{}` + `{}`".to_owned(),
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"{\"a\":\"```\"}".to_owned(),
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"\u{0}{\"a\":1}".to_owned(),
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"{\"a\":\"\\u0000\\uD83D\\uDE00\"}".to_owned(),
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"```".to_owned(),
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"{\"a\":1}\n{\"b\":2}".to_owned(),
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"\u{feff}{\"a\":1}\u{2028}".to_owned(),
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"\t{\"a\" : 1}\t".to_owned(),
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"[".repeat(500),
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format!("[\"{}\"]", "x".repeat(50_000)),
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];
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for body in &bodies {
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let text = note(body);
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let before = json_span(body).and_then(|span| serde_json::from_str::<Value>(body.get(span).unwrap_or_default()).ok());
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for index in [0usize, 1, usize::MAX] {
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if let Ok(edited) = format_json_block(&text, index) {
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assert_edit_is_consistent(&text, &edited);
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let after_body = json_of(&edited.text);
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if let (Some(span), Some(want)) = (json_span(after_body), before.clone()) {
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let got = after_body.get(span).and_then(|inner| serde_json::from_str::<Value>(inner).ok());
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assert_eq!(got, Some(want), "formatting keeps the value of {body:.20}");
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}
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}
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if let Ok(edited) = minify_json_block(&text, index) {
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assert_edit_is_consistent(&text, &edited);
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}
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}
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}
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}
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/// The body of the first fenced block in `text`.
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fn json_of(text: &str) -> &str {
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text.split("```").nth(1).unwrap_or_default()
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}
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