Fix: Add pagination to getReceivedTestimonials to prevent DoS from un…#33
Fix: Add pagination to getReceivedTestimonials to prevent DoS from un…#33Rav1Chauhan wants to merge 5 commits into
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…bounded array return
WalkthroughReplaced an unbounded testimonial enumeration function that caused gas-based denial of service with two new accessors: ChangesPagination Accessors & DoS Mitigation
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Actionable comments posted: 1
🧹 Nitpick comments (3)
contracts/src/VouchMe.sol (3)
156-160:getReceivedTestimonialsCountis a duplicate of the existinggetTestimonialCount.Both functions are
external viewand return_receivedTestimonials[receiver].length— they are semantically identical. This inflates the ABI surface and creates confusion for integrators about which function to use.If the intent is to align naming with the new paginated getter, deprecate
getTestimonialCount(or remove it if there are no existing off-chain consumers) rather than keeping both.🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed. In `@contracts/src/VouchMe.sol` around lines 156 - 160, The two functions getReceivedTestimonialsCount and getTestimonialCount both return _receivedTestimonials[receiver].length and are duplicates; remove one to avoid ABI/API confusion or mark the older one deprecated. Choose which name to keep (suggest keeping the paginated-friendly getReceivedTestimonialsCount), delete the other function declaration (or add a deprecation comment and an event if you must preserve ABI compatibility), and update any internal references/tests to call the retained function name.
161-165: Add NatSpec to the new paginated getter and documentlimitsemantics.Both new functions (
getReceivedTestimonialsCountandgetReceivedTestimonials) are missing NatSpec@dev/@param/@returncomments, unlike the rest of the contract's public API. At minimum, document:
- that
startis zero-based,- that the returned slice may be shorter than
limitwhen near the end of the array,- that a caller passing
limit = 0receives an empty array.🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed. In `@contracts/src/VouchMe.sol` around lines 161 - 165, Add NatSpec comments to both getReceivedTestimonialsCount and getReceivedTestimonials: include an `@dev` describing that these are paginated getters, document `@param` start as zero-based index, `@param` limit as maximum number of items to return and that passing limit = 0 yields an empty array, and document `@return` that the returned array is a slice which may be shorter than limit when near the end of the stored testimonials; ensure the comments use `@param` for receiver, start, limit and `@return` for the uint256[] result and match the style of the contract's existing public API.
375-388:deleteTestimonialdoes not call_burn, leaving the NFT live on-chain.After
_removeTestimonialFromListruns, the internal accounting (mappings, arrays) is cleaned up, butownerOf(tokenId)still resolves to the receiver andtokenURI(tokenId)remains accessible. This is a pre-existing gap not introduced by this PR, but worth tracking: any downstream pagination client querying a token ID returned before deletion will still see a valid NFT despite the testimonial being "deleted" from the contract's perspective.🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed. In `@contracts/src/VouchMe.sol` around lines 375 - 388, deleteTestimonial currently clears internal testimonial mappings via _removeTestimonialFromList but does not destroy the ERC721 token, so ownerOf(tokenId) and tokenURI(tokenId) remain valid; after the require checks and after calling _removeTestimonialFromList in deleteTestimonial, invoke the ERC721 burn routine (call _burn(tokenId)) to remove the NFT from circulation and ensure ownerOf/tokenURI no longer resolve, keeping the existing require on _ownerOf(tokenId) and existing emit TestimonialDeleted(tokenId, msg.sender).
🤖 Prompt for all review comments with AI agents
Verify each finding against the current code and only fix it if needed.
Inline comments:
In `@contracts/src/VouchMe.sol`:
- Line 169: Replace the invalid dynamic array allocation "return new uint256;"
with a proper memory array allocation like "return new uint256[](0)" in the
function that currently returns an empty uint256[]; also remove the duplicated
function getReceivedTestimonialsCount() (or getTestimonialCount()) so only one
function returns _receivedTestimonials[receiver].length to avoid redundancy —
locate and update the functions named getReceivedTestimonialsCount and
getTestimonialCount and the return statement referencing new uint256 to apply
these changes.
---
Nitpick comments:
In `@contracts/src/VouchMe.sol`:
- Around line 156-160: The two functions getReceivedTestimonialsCount and
getTestimonialCount both return _receivedTestimonials[receiver].length and are
duplicates; remove one to avoid ABI/API confusion or mark the older one
deprecated. Choose which name to keep (suggest keeping the paginated-friendly
getReceivedTestimonialsCount), delete the other function declaration (or add a
deprecation comment and an event if you must preserve ABI compatibility), and
update any internal references/tests to call the retained function name.
- Around line 161-165: Add NatSpec comments to both getReceivedTestimonialsCount
and getReceivedTestimonials: include an `@dev` describing that these are paginated
getters, document `@param` start as zero-based index, `@param` limit as maximum
number of items to return and that passing limit = 0 yields an empty array, and
document `@return` that the returned array is a slice which may be shorter than
limit when near the end of the stored testimonials; ensure the comments use
`@param` for receiver, start, limit and `@return` for the uint256[] result and match
the style of the contract's existing public API.
- Around line 375-388: deleteTestimonial currently clears internal testimonial
mappings via _removeTestimonialFromList but does not destroy the ERC721 token,
so ownerOf(tokenId) and tokenURI(tokenId) remain valid; after the require checks
and after calling _removeTestimonialFromList in deleteTestimonial, invoke the
ERC721 burn routine (call _burn(tokenId)) to remove the NFT from circulation and
ensure ownerOf/tokenURI no longer resolve, keeping the existing require on
_ownerOf(tokenId) and existing emit TestimonialDeleted(tokenId, msg.sender).
Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>
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Actionable comments posted: 1
♻️ Duplicate comments (1)
contracts/src/VouchMe.sol (1)
156-160: 🛠️ Refactor suggestion | 🟠 MajorDuplicate function:
getReceivedTestimonialsCountduplicatesgetTestimonialCount.Both functions return
_receivedTestimonials[receiver].length. Remove one to avoid confusion and reduce contract bytecode size. Consider keepinggetTestimonialCount(lines 213-217) since it already exists and deprecating this new one, or vice versa with a clear naming convention for the pagination API.♻️ Suggested fix: Remove the duplicate function
- function getReceivedTestimonialsCount( - address receiver - ) external view returns (uint256) { - return _receivedTestimonials[receiver].length; - }Then use
getTestimonialCount(receiver)consistently for pagination, or renamegetTestimonialCounttogetReceivedTestimonialsCountand remove the old one if you prefer the new naming.🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed. In `@contracts/src/VouchMe.sol` around lines 156 - 160, Remove the duplicate getter to avoid confusion and reduce bytecode: delete the getReceivedTestimonialsCount function and use the existing getTestimonialCount function (which returns _receivedTestimonials[receiver].length) consistently across the contract and pagination API, or alternatively keep getReceivedTestimonialsCount and remove/rename getTestimonialCount—ensure only one of the two remains and update any external references to the retained function name.
🤖 Prompt for all review comments with AI agents
Verify each finding against the current code and only fix it if needed.
Inline comments:
In `@contracts/src/VouchMe.sol`:
- Around line 161-185: getReceivedTestimonials was changed to a paginated
signature (address receiver, uint256 start, uint256 limit) which breaks existing
callers and the ABI; update all test calls that still pass a single address to
call getReceivedTestimonials(receiver, 0, <suitable_limit>) (e.g., use total
length or a safe max like 100) and regenerate the contract ABI so
web/src/abis/VouchMe.json matches the new function signature; search for
references to getReceivedTestimonials in tests (e.g., VouchMe.t.sol and
VouchMeFuzz.t.sol) and replace the single-arg calls accordingly, then recompile
and refresh the ABI artifact.
---
Duplicate comments:
In `@contracts/src/VouchMe.sol`:
- Around line 156-160: Remove the duplicate getter to avoid confusion and reduce
bytecode: delete the getReceivedTestimonialsCount function and use the existing
getTestimonialCount function (which returns
_receivedTestimonials[receiver].length) consistently across the contract and
pagination API, or alternatively keep getReceivedTestimonialsCount and
remove/rename getTestimonialCount—ensure only one of the two remains and update
any external references to the retained function name.
| function getReceivedTestimonials( | ||
| address receiver, | ||
| uint256 start, | ||
| uint256 limit | ||
| ) external view returns (uint256[] memory) { | ||
| uint256 total = _receivedTestimonials[receiver].length; | ||
|
|
||
| if (start >= total) { | ||
| return new uint256[](0); | ||
| } | ||
|
|
||
| uint256 end = start + limit; | ||
| if (end > total) { | ||
| end = total; | ||
| } | ||
|
|
||
| uint256 size = end - start; | ||
| uint256[] memory result = new uint256[](size); | ||
|
|
||
| for (uint256 i = 0; i < size; i++) { | ||
| result[i] = _receivedTestimonials[receiver][start + i]; | ||
| } | ||
|
|
||
| return result; | ||
| } |
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Pagination implementation is correct, but this is a breaking change that will cause test compilation failures.
The pagination logic properly bounds gas usage and addresses the DoS concern. However, the new signature requires three parameters (receiver, start, limit), breaking existing callers that pass only the receiver address:
contracts/test/VouchMe.t.sol:290callsgetReceivedTestimonials(alice)contracts/test/VouchMeFuzz.t.sol:94and:177callgetReceivedTestimonials(receiver)web/src/abis/VouchMe.jsonhas stale ABI entries for the old single-argument signature
🔧 Suggested test file updates
For tests, update calls to use the new paginated signature. Example for VouchMe.t.sol:290:
-uint256[] memory remainingTestimonials = vouchMe.getReceivedTestimonials(alice);
+uint256 count = vouchMe.getTestimonialCount(alice);
+uint256[] memory remainingTestimonials = vouchMe.getReceivedTestimonials(alice, 0, count);Also regenerate the ABI file after contract changes.
🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed.
In `@contracts/src/VouchMe.sol` around lines 161 - 185, getReceivedTestimonials
was changed to a paginated signature (address receiver, uint256 start, uint256
limit) which breaks existing callers and the ABI; update all test calls that
still pass a single address to call getReceivedTestimonials(receiver, 0,
<suitable_limit>) (e.g., use total length or a safe max like 100) and regenerate
the contract ABI so web/src/abis/VouchMe.json matches the new function
signature; search for references to getReceivedTestimonials in tests (e.g.,
VouchMe.t.sol and VouchMeFuzz.t.sol) and replace the single-arg calls
accordingly, then recompile and refresh the ABI artifact.
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Actionable comments posted: 1
🧹 Nitpick comments (1)
contracts/test/VouchMe.t.sol (1)
473-480: Consider testing withgetTestimonialCountfor consistency.The test passes
limit=0directly. While this works (sincestart >= totalreturns empty), it doesn't explicitly verify the "no testimonials exist" scenario the same way other tests do.For consistency with other tests and clearer intent, consider:
function testGetReceivedTestimonialsEmpty() public { + uint256 count = vouchMe.getTestimonialCount(alice); + assertEq(count, 0); // Explicitly verify no testimonials exist uint256[] memory testimonials = vouchMe.getReceivedTestimonials( alice, 0, - 0 + count ); assertEq(testimonials.length, 0); }This is a minor style suggestion—the current test is functionally correct.
🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed. In `@contracts/test/VouchMe.t.sol` around lines 473 - 480, Replace the hardcoded zero in testGetReceivedTestimonialsEmpty with an explicit count fetched from the contract: call vouchMe.getTestimonialCount(alice) into a uint256 total and then call vouchMe.getReceivedTestimonials(alice, total, 0) (or start = total, limit = 0) and assert length == 0; this uses getTestimonialCount to clearly express "no testimonials exist" like other tests and keeps the assertion behavior the same.
🤖 Prompt for all review comments with AI agents
Verify each finding against the current code and only fix it if needed.
Inline comments:
In @.env:
- Line 1: The repository contains a committed `.env` exposing
NEXT_PUBLIC_PROJECT_ID; remove this credential from the repo and history and
prevent future leaks: add a `.gitignore` entry for `.env`, create a
`.env.example` with a placeholder NEXT_PUBLIC_PROJECT_ID to document required
variables, rotate the exposed WalletConnect Project ID in the WalletConnect
Cloud dashboard, delete the committed `.env` from the repository and purge it
from git history using a history-rewriting tool (e.g., BFG or git
filter-branch), and ensure the new actual `.env` is not tracked going forward.
---
Nitpick comments:
In `@contracts/test/VouchMe.t.sol`:
- Around line 473-480: Replace the hardcoded zero in
testGetReceivedTestimonialsEmpty with an explicit count fetched from the
contract: call vouchMe.getTestimonialCount(alice) into a uint256 total and then
call vouchMe.getReceivedTestimonials(alice, total, 0) (or start = total, limit =
0) and assert length == 0; this uses getTestimonialCount to clearly express "no
testimonials exist" like other tests and keeps the assertion behavior the same.
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.envcontracts/test/VouchMe.t.sol
| @@ -0,0 +1 @@ | |||
| NEXT_PUBLIC_PROJECT_ID=38b236298d3253f98d42e08991ad74d3 No newline at end of file | |||
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# Check if .env is in .gitignore
echo "Checking .gitignore for .env patterns:"
if [ -f .gitignore ]; then
grep -n "\.env" .gitignore || echo "No .env pattern found in .gitignore"
else
echo ".gitignore file not found"
fi
# Check for .env.example
echo -e "\nChecking for .env.example:"
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Do not commit .env files with credentials to version control.
The .env file with your WalletConnect Project ID is committed to the repository. Even though NEXT_PUBLIC_ credentials are publicly visible at runtime, committing them creates security risks:
- The Project ID can be abused for quota exhaustion or project impersonation
- Git history permanently associates this credential with your project
- No
.gitignorecurrently prevents accidental commits of sensitive files
Required actions:
- Create
.gitignoreand add.envto it - Create
.env.examplewith a placeholder value for documentation - Rotate the exposed Project ID in WalletConnect Cloud
- Remove this file from git history using
git filter-branchor BFG Repo-Cleaner
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[warning] 1-1: [EndingBlankLine] No blank line at the end of the file
(EndingBlankLine)
🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed.
In @.env at line 1, The repository contains a committed `.env` exposing
NEXT_PUBLIC_PROJECT_ID; remove this credential from the repo and history and
prevent future leaks: add a `.gitignore` entry for `.env`, create a
`.env.example` with a placeholder NEXT_PUBLIC_PROJECT_ID to document required
variables, rotate the exposed WalletConnect Project ID in the WalletConnect
Cloud dashboard, delete the committed `.env` from the repository and purge it
from git history using a history-rewriting tool (e.g., BFG or git
filter-branch), and ensure the new actual `.env` is not tracked going forward.
|
Please resolve the merge conflicts before review. Your PR will only be reviewed by a maintainer after all conflicts have been resolved. 📺 Watch this video to understand why conflicts occur and how to resolve them: |
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⚠️ Outside diff range comments (2)
contracts/src/VouchMe.sol (2)
195-198:⚠️ Potential issue | 🟡 Minor | ⚡ Quick winNatSpec now conflicts with paginated behavior.
Line 195-198 says “Gets all testimonials received,” but the function now returns a page slice (
start,limit). Please update the docstring to avoid integration misuse.🤖 Prompt for AI Agents
Verify each finding against current code. Fix only still-valid issues, skip the rest with a brief reason, keep changes minimal, and validate. In `@contracts/src/VouchMe.sol` around lines 195 - 198, Update the NatSpec for the testimonials retrieval function to reflect its paginated behavior: change the `@dev` description to state it returns a paginated slice of testimonials for a receiver and document the pagination parameters `start` and `limit`, and update the `@return` to say it returns a paginated array/slice of testimonial token IDs (and if applicable the total count or next cursor) instead of "Gets all testimonials received". Mention the `receiver`, `start`, and `limit` symbols explicitly in the docstring so integrators know this function returns only a subset of testimonials.
95-103:⚠️ Potential issue | 🔴 Critical | ⚡ Quick winUse
abi.encodeinstead ofabi.encodePackedfor signed payloads with dynamic fields.Line 95-103 packs
content,giverName, andprofileUrlviaabi.encodePacked, which is ambiguous for multiple dynamic types and can validate unintended tuples under the same signature.Suggested fix
- bytes32 messageHash = keccak256( - abi.encodePacked( - senderAddress, - msg.sender, // receiver - content, - giverName, - profileUrl - ) - ); + bytes32 messageHash = keccak256( + abi.encode( + senderAddress, + msg.sender, // receiver + content, + giverName, + profileUrl + ) + );As per coding guidelines, “Review for common smart contract vulnerabilities.”
🤖 Prompt for AI Agents
Verify each finding against current code. Fix only still-valid issues, skip the rest with a brief reason, keep changes minimal, and validate. In `@contracts/src/VouchMe.sol` around lines 95 - 103, The hash construction for messageHash uses abi.encodePacked with multiple dynamic fields which is ambiguous; replace abi.encodePacked with abi.encode when building the keccak256 input in the messageHash computation (the keccak256 call that currently packs senderAddress, msg.sender, content, giverName, profileUrl) so that dynamic types are encoded unambiguously and signatures validate correctly.
♻️ Duplicate comments (1)
contracts/src/VouchMe.sol (1)
204-208:⚠️ Potential issue | 🟠 Major | 🏗️ Heavy liftPaginated signature change is still breaking downstream contract consumers.
Line 204-208 changed
getReceivedTestimonialsto(receiver,start,limit), but referenced generated/web consumers still use the old single-argument API (e.g.,web/src/typechain-types/VouchMe.ts:675-679,web/src/app/testimonials/page.tsx:120,web/src/app/dashboard/page.tsx:276). This will fail TS typing/runtime calls until ABI + TypeChain + call sites are synchronized.As per coding guidelines, “Verify that any modification to contract logic includes corresponding updates to automated tests.”
🤖 Prompt for AI Agents
Verify each finding against current code. Fix only still-valid issues, skip the rest with a brief reason, keep changes minimal, and validate. In `@contracts/src/VouchMe.sol` around lines 204 - 208, The change to getReceivedTestimonials' signature (now getReceivedTestimonials(address receiver, uint256 start, uint256 limit)) breaks downstream consumers and generated TypeChain types; either revert the function signature to the original single-argument API or update the ABI/TypeChain generation and all call sites to match the new 3-arg signature. Specifically, update the getReceivedTestimonials references in generated/web consumers (e.g., VouchMe.ts) and app pages (web/src/app/testimonials/page.tsx, web/src/app/dashboard/page.tsx) to pass (receiver, start, limit), regenerate TypeChain/ABI artifacts, and run/update tests that assert this contract call to ensure ABI, TypeChain, and call sites are synchronized.
🤖 Prompt for all review comments with AI agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.
Outside diff comments:
In `@contracts/src/VouchMe.sol`:
- Around line 195-198: Update the NatSpec for the testimonials retrieval
function to reflect its paginated behavior: change the `@dev` description to state
it returns a paginated slice of testimonials for a receiver and document the
pagination parameters `start` and `limit`, and update the `@return` to say it
returns a paginated array/slice of testimonial token IDs (and if applicable the
total count or next cursor) instead of "Gets all testimonials received". Mention
the `receiver`, `start`, and `limit` symbols explicitly in the docstring so
integrators know this function returns only a subset of testimonials.
- Around line 95-103: The hash construction for messageHash uses
abi.encodePacked with multiple dynamic fields which is ambiguous; replace
abi.encodePacked with abi.encode when building the keccak256 input in the
messageHash computation (the keccak256 call that currently packs senderAddress,
msg.sender, content, giverName, profileUrl) so that dynamic types are encoded
unambiguously and signatures validate correctly.
---
Duplicate comments:
In `@contracts/src/VouchMe.sol`:
- Around line 204-208: The change to getReceivedTestimonials' signature (now
getReceivedTestimonials(address receiver, uint256 start, uint256 limit)) breaks
downstream consumers and generated TypeChain types; either revert the function
signature to the original single-argument API or update the ABI/TypeChain
generation and all call sites to match the new 3-arg signature. Specifically,
update the getReceivedTestimonials references in generated/web consumers (e.g.,
VouchMe.ts) and app pages (web/src/app/testimonials/page.tsx,
web/src/app/dashboard/page.tsx) to pass (receiver, start, limit), regenerate
TypeChain/ABI artifacts, and run/update tests that assert this contract call to
ensure ABI, TypeChain, and call sites are synchronized.
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contracts/src/VouchMe.sol
1 participant
…bounded array return
Addressed Issues:
Fixes #28
Fix: Prevent DoS via Unbounded Array Return in getReceivedTestimonials
Problem
The previous implementation of:
function getReceivedTestimonials(address receiver)
returned the entire _receivedTestimonials[receiver] dynamic array.
As testimonials accumulate over time, the array grows without bound.
Solidity must copy the entire array from storage to memory when returning it.
This causes:
Gas usage growing linearly with array size
Potential exceeding of block gas limit
Function reverting due to out-of-gas
Inability for users/dApps to retrieve testimonials
Possible Denial of Service (DoS) scenario
Solution
Replaced the unbounded return with pagination:
Added:
getReceivedTestimonialsCount(address receiver)
getReceivedTestimonials(address receiver, uint256 start, uint256 limit)
This ensures:
Bounded gas usage
Safe and scalable retrieval
No change to storage logic
Backward compatibility with existing data
Impact
Prevents potential DoS
Improves scalability
Aligns with Solidity best practices
Screenshots/Recordings:
This change introduces pagination to prevent potential Denial of Service (DoS) caused by returning an unbounded dynamic array.
The previous implementation returned the entire _receivedTestimonials array for a user, which could grow indefinitely over time. As Solidity copies storage arrays to memory when returning them, gas costs grow linearly with array size. Eventually, this could cause the function to revert due to exceeding the block gas limit.
The updated implementation adds:
This ensures scalable and gas-bounded retrieval while preserving existing storage logic..
Additional Notes:
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