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Avoid allocation when validating HTTP and HTTPS prefixes (#12313)

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Charlie Marsh 2024-07-13 17:25:02 -04:00 • committed by GitHub
parent 1a3ee45b23
commit 3bfbbbc78c
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1 changed files with 19 additions and 12 deletions
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31
crates/ruff_linter/src/rules/flake8_bandit/rules/suspicious_function_call.rs
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@ -825,6 +825,19 @@ impl Violation for SuspiciousFTPLibUsage {
/// S301, S302, S303, S304, S305, S306, S307, S308, S310, S311, S312, S313, S314, S315, S316, S317, S318, S319, S320, S321, S323
pub(crate) fn suspicious_function_call(checker: &mut Checker, call: &ExprCall) {
/// Returns `true` if the iterator starts with the given prefix.
fn has_prefix(mut chars: impl Iterator<Item = char>, prefix: &str) -> bool {
for expected in prefix.chars() {
let Some(actual) = chars.next() else {
return false;
};
if actual != expected {
return false;
}
}
true
}
let Some(diagnostic_kind) = checker.semantic().resolve_qualified_name(call.func.as_ref()).and_then(|qualified_name| {
match qualified_name.segments() {
// Pickle
@ -857,16 +870,14 @@ pub(crate) fn suspicious_function_call(checker: &mut Checker, call: &ExprCall) {
match call.arguments.find_argument("url", 0) {
// If the `url` argument is a string literal, allow `http` and `https` schemes.
Some(Expr::StringLiteral(ast::ExprStringLiteral { value, .. })) => {
let url = value.to_str().trim_start();
if url.starts_with("http://") || url.starts_with("https://") {
if has_prefix(value.chars().skip_while(|c| c.is_whitespace()), "http://") || has_prefix(value.chars().skip_while(|c| c.is_whitespace()), "https://") {
return None;
}
},
// If the `url` argument is an f-string literal, allow `http` and `https` schemes.
Some(Expr::FString(ast::ExprFString { value, .. })) => {
if let Some(ast::FStringElement::Literal(ast::FStringLiteralElement { value, .. })) = value.elements().next() {
let url = value.trim_start();
if url.starts_with("http://") || url.starts_with("https://") {
if has_prefix(value.chars().skip_while(|c| c.is_whitespace()), "http://") || has_prefix(value.chars().skip_while(|c| c.is_whitespace()), "https://") {
return None;
}
}
@ -883,8 +894,7 @@ pub(crate) fn suspicious_function_call(checker: &mut Checker, call: &ExprCall) {
match call.arguments.find_argument("url", 0) {
// If the `url` argument is a string literal, allow `http` and `https` schemes.
Some(Expr::StringLiteral(ast::ExprStringLiteral { value, .. })) => {
let url = value.to_str().trim_start();
if url.starts_with("http://") || url.starts_with("https://") {
if has_prefix(value.chars().skip_while(|c| c.is_whitespace()), "http://") || has_prefix(value.chars().skip_while(|c| c.is_whitespace()), "https://") {
return None;
}
},
@ -892,8 +902,7 @@ pub(crate) fn suspicious_function_call(checker: &mut Checker, call: &ExprCall) {
// If the `url` argument is an f-string literal, allow `http` and `https` schemes.
Some(Expr::FString(ast::ExprFString { value, .. })) => {
if let Some(ast::FStringElement::Literal(ast::FStringLiteralElement { value, .. })) = value.elements().next() {
let url = value.trim_start();
if url.starts_with("http://") || url.starts_with("https://") {
if has_prefix(value.chars().skip_while(|c| c.is_whitespace()), "http://") || has_prefix(value.chars().skip_while(|c| c.is_whitespace()), "https://") {
return None;
}
}
@ -905,8 +914,7 @@ pub(crate) fn suspicious_function_call(checker: &mut Checker, call: &ExprCall) {
match arguments.find_argument("url", 0) {
// If the `url` argument is a string literal, allow `http` and `https` schemes.
Some(Expr::StringLiteral(ast::ExprStringLiteral { value, .. })) => {
let url = value.to_str().trim_start();
if url.starts_with("http://") || url.starts_with("https://") {
if has_prefix(value.chars().skip_while(|c| c.is_whitespace()), "http://") || has_prefix(value.chars().skip_while(|c| c.is_whitespace()), "https://") {
return None;
}
},
@ -914,8 +922,7 @@ pub(crate) fn suspicious_function_call(checker: &mut Checker, call: &ExprCall) {
// If the `url` argument is an f-string literal, allow `http` and `https` schemes.
Some(Expr::FString(ast::ExprFString { value, .. })) => {
if let Some(ast::FStringElement::Literal(ast::FStringLiteralElement { value, .. })) = value.elements().next() {
let url = value.trim_start();
if url.starts_with("http://") || url.starts_with("https://") {
if has_prefix(value.chars().skip_while(|c| c.is_whitespace()), "http://") || has_prefix(value.chars().skip_while(|c| c.is_whitespace()), "https://") {
return None;
}
}