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Pashov L-05 add more special characters to escape #374

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merged 5 commits into from
Oct 28, 2024
Merged

Pashov L-05 add more special characters to escape #374

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62f3a63
Pashov L-05 add more special characters to escape
dianakocsis Oct 17, 2024
7c5f06a
merge main
dianakocsis Oct 24, 2024
429bdbc
Merge branch 'main' into pashov-l05
dianakocsis Oct 25, 2024
6b1baee
fix bytecode snapshot
dianakocsis Oct 25, 2024
bc5b7f3
Merge branch 'pashov-l05' of https://github.com/Uniswap/v4-periphery …
dianakocsis Oct 25, 2024
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2 changes: 1 addition & 1 deletion .forge-snapshots/positionDescriptor bytecode size.snap
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Original file line number Diff line number Diff line change
@@ -1 +1 @@
31236
31443
36 changes: 20 additions & 16 deletions src/libraries/Descriptor.sol
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Original file line number Diff line number Diff line change
Expand Up @@ -45,13 +45,13 @@ library Descriptor {
function constructTokenURI(ConstructTokenURIParams memory params) internal pure returns (string memory) {
string memory name = generateName(params, feeToPercentString(params.fee));
string memory descriptionPartOne = generateDescriptionPartOne(
escapeQuotes(params.quoteCurrencySymbol),
escapeQuotes(params.baseCurrencySymbol),
escapeSpecialCharacters(params.quoteCurrencySymbol),
escapeSpecialCharacters(params.baseCurrencySymbol),
addressToString(params.poolManager)
);
string memory descriptionPartTwo = generateDescriptionPartTwo(
params.tokenId.toString(),
escapeQuotes(params.baseCurrencySymbol),
escapeSpecialCharacters(params.baseCurrencySymbol),
addressToString(Currency.unwrap(params.quoteCurrency)),
addressToString(Currency.unwrap(params.baseCurrency)),
params.hooks == address(0) ? "No Hook" : addressToString(params.hooks),
Expand Down Expand Up @@ -81,23 +81,23 @@ library Descriptor {
);
}

/// @notice Escapes double quotes in a string if they are present
function escapeQuotes(string memory symbol) internal pure returns (string memory) {
/// @notice Escapes special characters in a string if they are present
function escapeSpecialCharacters(string memory symbol) internal pure returns (string memory) {
bytes memory symbolBytes = bytes(symbol);
uint8 quotesCount = 0;
// count the amount of double quotes (") in the symbol
uint8 specialCharCount = 0;
// count the amount of double quotes, form feeds, new lines, carriage returns, or tabs in the symbol
for (uint8 i = 0; i < symbolBytes.length; i++) {
if (symbolBytes[i] == '"') {
quotesCount++;
if (isSpecialCharacter(symbolBytes[i])) {
specialCharCount++;
}
}
if (quotesCount > 0) {
// create a new bytes array with enough space to hold the original bytes plus space for the backslashes to escape the quotes
bytes memory escapedBytes = new bytes(symbolBytes.length + quotesCount);
if (specialCharCount > 0) {
// create a new bytes array with enough space to hold the original bytes plus space for the backslashes to escape the special characters
bytes memory escapedBytes = new bytes(symbolBytes.length + specialCharCount);
uint256 index;
for (uint8 i = 0; i < symbolBytes.length; i++) {
// add a '\' before any double quotes
if (symbolBytes[i] == '"') {
// add a '\' before any double quotes, form feeds, new lines, carriage returns, or tabs
if (isSpecialCharacter(symbolBytes[i])) {
escapedBytes[index++] = "\\";
}
// copy each byte from original string to the new array
Expand Down Expand Up @@ -186,9 +186,9 @@ library Descriptor {
"Uniswap - ",
feeTier,
" - ",
escapeQuotes(params.quoteCurrencySymbol),
escapeSpecialCharacters(params.quoteCurrencySymbol),
"/",
escapeQuotes(params.baseCurrencySymbol),
escapeSpecialCharacters(params.baseCurrencySymbol),
" - ",
tickToDecimalString(
!params.flipRatio ? params.tickLower : params.tickUpper,
Expand Down Expand Up @@ -503,6 +503,10 @@ library Descriptor {
}
}

function isSpecialCharacter(bytes1 b) private pure returns (bool) {
return b == '"' || b == "\u000c" || b == "\n" || b == "\r" || b == "\t";
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am i mad? surely \u000c is longer than a single byte?

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@djb15 djb15 Oct 24, 2024 •
edited
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I had exactly the same thought! Turns out it gets properly escaped to 1 byte:

pragma solidity ^0.8.0;

contract RandomTest {
    function stringToBytes32() public pure returns (uint256 length) {
        string memory source = "\u000c";
        bytes memory tempEmptyStringTest = bytes(source);
        return tempEmptyStringTest.length;
    }
}

If you test this out in Remix the return value is 1 :)

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wild, thanks for the poc :)

}

function scale(uint256 n, uint256 inMn, uint256 inMx, uint256 outMn, uint256 outMx)
private
pure
Expand Down
23 changes: 14 additions & 9 deletions test/libraries/Descriptor.t.sol
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Expand Up @@ -39,15 +39,20 @@ contract DescriptorTest is Test {
);
}

function test_escapeQuotes_succeeds() public pure {
assertEq(Descriptor.escapeQuotes(""), "");
assertEq(Descriptor.escapeQuotes("a"), "a");
assertEq(Descriptor.escapeQuotes("abc"), "abc");
assertEq(Descriptor.escapeQuotes("a\"bc"), "a\\\"bc");
assertEq(Descriptor.escapeQuotes("a\"b\"c"), "a\\\"b\\\"c");
assertEq(Descriptor.escapeQuotes("a\"b\"c\""), "a\\\"b\\\"c\\\"");
assertEq(Descriptor.escapeQuotes("\"a\"b\"c\""), "\\\"a\\\"b\\\"c\\\"");
assertEq(Descriptor.escapeQuotes("\"a\"b\"c\"\""), "\\\"a\\\"b\\\"c\\\"\\\"");
function test_escapeSpecialCharacters_succeeds() public pure {
assertEq(Descriptor.escapeSpecialCharacters(""), "");
assertEq(Descriptor.escapeSpecialCharacters("a"), "a");
assertEq(Descriptor.escapeSpecialCharacters("abc"), "abc");
assertEq(Descriptor.escapeSpecialCharacters("a\"bc"), "a\\\"bc");
assertEq(Descriptor.escapeSpecialCharacters("a\"b\"c"), "a\\\"b\\\"c");
assertEq(Descriptor.escapeSpecialCharacters("a\"b\"c\""), "a\\\"b\\\"c\\\"");
assertEq(Descriptor.escapeSpecialCharacters("\"a\"b\"c\""), "\\\"a\\\"b\\\"c\\\"");
assertEq(Descriptor.escapeSpecialCharacters("\"a\"b\"c\"\""), "\\\"a\\\"b\\\"c\\\"\\\"");

assertEq(Descriptor.escapeSpecialCharacters("a\rbc"), "a\\\rbc");
assertEq(Descriptor.escapeSpecialCharacters("a\nbc"), "a\\\nbc");
assertEq(Descriptor.escapeSpecialCharacters("a\tbc"), "a\\\tbc");
assertEq(Descriptor.escapeSpecialCharacters("a\u000cbc"), "a\\\u000cbc");
}

function test_tickToDecimalString_withTickSpacing10() public pure {
Expand Down
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