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fix bug with res.del when the first arguments it's a function#35

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bjohansebas merged 4 commits into
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more-tests
Mar 29, 2025
Merged

fix bug with res.del when the first arguments it's a function#35
bjohansebas merged 4 commits into
mainfrom
more-tests

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@bjohansebas bjohansebas commented Mar 15, 2025 •
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I found a bug in res.del, because if its first argument is a function, we shouldn't modify it to be res.delete.

And I added more tests to ensure that more cases are covered.

@bjohansebas bjohansebas requested a review from a team March 15, 2025 23:30
@bjohansebas bjohansebas added the enhancement New feature or request label Mar 15, 2025
github-advanced-security[bot]
github-advanced-security AI found potential problems Mar 15, 2025
View reviewed changes
Comment thread transforms/__testfixtures__/v4-deprecated-signatures/send-file.input.ts
Comment on lines +25 to +27
app.get('/file/:name', (req, res, next) => {
res.sendfile()
})

Check failure

Code scanning / CodeQL

Missing rate limiting

This route handler performs [a file system access](1), but is not rate-limited.

Copilot Autofix

AI about 1 year ago

To fix the problem, we need to introduce rate limiting to the Express application. The best way to do this is by using the express-rate-limit package, which allows us to set a maximum number of requests that can be made to the server within a specified time window. This will help prevent abuse and protect the server from being overwhelmed by too many requests.

We will:

  1. Install the express-rate-limit package.
  2. Import the package in the file.
  3. Set up a rate limiter with appropriate configuration.
  4. Apply the rate limiter to all routes that perform file system access.
Suggested changeset 2
transforms/__testfixtures__/v4-deprecated-signatures/send-file.input.ts

Autofix patch

Autofix patch
Run the following command in your local git repository to apply this patch
cat << 'EOF' | git apply
diff --git a/transforms/__testfixtures__/v4-deprecated-signatures/send-file.input.ts b/transforms/__testfixtures__/v4-deprecated-signatures/send-file.input.ts
--- a/transforms/__testfixtures__/v4-deprecated-signatures/send-file.input.ts
+++ b/transforms/__testfixtures__/v4-deprecated-signatures/send-file.input.ts
@@ -3,2 +3,3 @@
 import sendfile from "other-place"
+import rateLimit from "express-rate-limit";
 
@@ -14,2 +15,7 @@
 
+const limiter = rateLimit({
+  windowMs: 15 * 60 * 1000, // 15 minutes
+  max: 100, // max 100 requests per windowMs
+});
+
 const sharedSendFile = (res, next, fileName) => {
@@ -24,2 +30,4 @@
 
+app.use(limiter);
+
 app.get('/file/:name', (req, res, next) => {
EOF
@@ -3,2 +3,3 @@
import sendfile from "other-place"
import rateLimit from "express-rate-limit";

@@ -14,2 +15,7 @@

const limiter = rateLimit({
windowMs: 15 * 60 * 1000, // 15 minutes
max: 100, // max 100 requests per windowMs
});

const sharedSendFile = (res, next, fileName) => {
@@ -24,2 +30,4 @@

app.use(limiter);

app.get('/file/:name', (req, res, next) => {
package.json
Outside changed files

Autofix patch

Autofix patch
Run the following command in your local git repository to apply this patch
cat << 'EOF' | git apply
diff --git a/package.json b/package.json
--- a/package.json
+++ b/package.json
@@ -4,3 +4,6 @@
   "description": "Codemods for updating express servers.",
-  "contributors": ["Sebastian Beltran <bjohansebas@gmail.com>", "Filip Kudla <filip.kudla.dev@gmail.com>"],
+  "contributors": [
+    "Sebastian Beltran <bjohansebas@gmail.com>",
+    "Filip Kudla <filip.kudla.dev@gmail.com>"
+  ],
   "license": "MIT",
@@ -13,4 +16,9 @@
   },
-  "keywords": ["codemods", "express"],
-  "files": ["build"],
+  "keywords": [
+    "codemods",
+    "express"
+  ],
+  "files": [
+    "build"
+  ],
   "scripts": {
@@ -30,3 +38,4 @@
     "picocolors": "^1.1.1",
-    "prompts": "^2.4.2"
+    "prompts": "^2.4.2",
+    "express-rate-limit": "^7.5.0"
   },
EOF
@@ -4,3 +4,6 @@
"description": "Codemods for updating express servers.",
"contributors": ["Sebastian Beltran <bjohansebas@gmail.com>", "Filip Kudla <filip.kudla.dev@gmail.com>"],
"contributors": [
"Sebastian Beltran <bjohansebas@gmail.com>",
"Filip Kudla <filip.kudla.dev@gmail.com>"
],
"license": "MIT",
@@ -13,4 +16,9 @@
},
"keywords": ["codemods", "express"],
"files": ["build"],
"keywords": [
"codemods",
"express"
],
"files": [
"build"
],
"scripts": {
@@ -30,3 +38,4 @@
"picocolors": "^1.1.1",
"prompts": "^2.4.2"
"prompts": "^2.4.2",
"express-rate-limit": "^7.5.0"
},
This fix introduces these dependencies
Package Version Security advisories
express-rate-limit (npm) 7.5.0 None
Copilot is powered by AI and may make mistakes. Always verify output.
Unable to commit as this autofix suggestion is now outdated
Comment thread transforms/__testfixtures__/v4-deprecated-signatures/send-file.input.ts
Comment on lines +29 to +31
app.get('/file/:name', (req, res, next) => {
res.sendfile("file.txt")
})

Check failure

Code scanning / CodeQL

Missing rate limiting

This route handler performs [a file system access](1), but is not rate-limited.

Copilot Autofix

AI about 1 year ago

To fix the problem, we need to introduce rate limiting to the Express application. The best way to do this is by using the express-rate-limit package, which allows us to set a maximum number of requests that can be made to the server within a specified time window. We will apply this rate limiter to all routes to ensure that the application is protected from denial-of-service attacks.

  1. Install the express-rate-limit package.
  2. Import the express-rate-limit package in the file.
  3. Set up a rate limiter with appropriate configuration (e.g., maximum of 100 requests per 15 minutes).
  4. Apply the rate limiter to the Express application using app.use(limiter).
Suggested changeset 2
transforms/__testfixtures__/v4-deprecated-signatures/send-file.input.ts

Autofix patch

Autofix patch
Run the following command in your local git repository to apply this patch
cat << 'EOF' | git apply
diff --git a/transforms/__testfixtures__/v4-deprecated-signatures/send-file.input.ts b/transforms/__testfixtures__/v4-deprecated-signatures/send-file.input.ts
--- a/transforms/__testfixtures__/v4-deprecated-signatures/send-file.input.ts
+++ b/transforms/__testfixtures__/v4-deprecated-signatures/send-file.input.ts
@@ -3,4 +3,14 @@
 import sendfile from "other-place"
+import RateLimit from "express-rate-limit";
 
 const app = express();
+
+// set up rate limiter: maximum of 100 requests per 15 minutes
+const limiter = RateLimit({
+  windowMs: 15 * 60 * 1000, // 15 minutes
+  max: 100, // max 100 requests per windowMs
+});
+
+// apply rate limiter to all requests
+app.use(limiter);
 const options = {
EOF
@@ -3,4 +3,14 @@
import sendfile from "other-place"
import RateLimit from "express-rate-limit";

const app = express();

// set up rate limiter: maximum of 100 requests per 15 minutes
const limiter = RateLimit({
windowMs: 15 * 60 * 1000, // 15 minutes
max: 100, // max 100 requests per windowMs
});

// apply rate limiter to all requests
app.use(limiter);
const options = {
package.json
Outside changed files

Autofix patch

Autofix patch
Run the following command in your local git repository to apply this patch
cat << 'EOF' | git apply
diff --git a/package.json b/package.json
--- a/package.json
+++ b/package.json
@@ -4,3 +4,6 @@
   "description": "Codemods for updating express servers.",
-  "contributors": ["Sebastian Beltran <bjohansebas@gmail.com>", "Filip Kudla <filip.kudla.dev@gmail.com>"],
+  "contributors": [
+    "Sebastian Beltran <bjohansebas@gmail.com>",
+    "Filip Kudla <filip.kudla.dev@gmail.com>"
+  ],
   "license": "MIT",
@@ -13,4 +16,9 @@
   },
-  "keywords": ["codemods", "express"],
-  "files": ["build"],
+  "keywords": [
+    "codemods",
+    "express"
+  ],
+  "files": [
+    "build"
+  ],
   "scripts": {
@@ -30,3 +38,4 @@
     "picocolors": "^1.1.1",
-    "prompts": "^2.4.2"
+    "prompts": "^2.4.2",
+    "express-rate-limit": "^7.5.0"
   },
EOF
@@ -4,3 +4,6 @@
"description": "Codemods for updating express servers.",
"contributors": ["Sebastian Beltran <bjohansebas@gmail.com>", "Filip Kudla <filip.kudla.dev@gmail.com>"],
"contributors": [
"Sebastian Beltran <bjohansebas@gmail.com>",
"Filip Kudla <filip.kudla.dev@gmail.com>"
],
"license": "MIT",
@@ -13,4 +16,9 @@
},
"keywords": ["codemods", "express"],
"files": ["build"],
"keywords": [
"codemods",
"express"
],
"files": [
"build"
],
"scripts": {
@@ -30,3 +38,4 @@
"picocolors": "^1.1.1",
"prompts": "^2.4.2"
"prompts": "^2.4.2",
"express-rate-limit": "^7.5.0"
},
This fix introduces these dependencies
Package Version Security advisories
express-rate-limit (npm) 7.5.0 None
Copilot is powered by AI and may make mistakes. Always verify output.
Unable to commit as this autofix suggestion is now outdated
Comment thread transforms/__testfixtures__/v4-deprecated-signatures/send-file.output.ts
Comment on lines +25 to +27
app.get('/file/:name', (req, res, next) => {
res.sendFile()
})

Check failure

Code scanning / CodeQL

Missing rate limiting

This route handler performs [a file system access](1), but is not rate-limited.
Comment thread transforms/__testfixtures__/v4-deprecated-signatures/send-file.output.ts
Comment on lines +29 to +31
app.get('/file/:name', (req, res, next) => {
res.sendFile("file.txt")
})

Check failure

Code scanning / CodeQL

Missing rate limiting

This route handler performs [a file system access](1), but is not rate-limited.

Copilot Autofix

AI about 1 year ago

To fix the problem, we need to introduce rate limiting to the Express application. The best way to do this is by using the express-rate-limit package, which allows us to set up a rate limiter middleware. This middleware will limit the number of requests a client can make within a specified time window.

  1. Install the express-rate-limit package.
  2. Import the express-rate-limit package in the file.
  3. Set up a rate limiter with appropriate configuration (e.g., maximum of 100 requests per 15 minutes).
  4. Apply the rate limiter middleware to the Express application.
Suggested changeset 2
transforms/__testfixtures__/v4-deprecated-signatures/send-file.output.ts

Autofix patch

Autofix patch
Run the following command in your local git repository to apply this patch
cat << 'EOF' | git apply
diff --git a/transforms/__testfixtures__/v4-deprecated-signatures/send-file.output.ts b/transforms/__testfixtures__/v4-deprecated-signatures/send-file.output.ts
--- a/transforms/__testfixtures__/v4-deprecated-signatures/send-file.output.ts
+++ b/transforms/__testfixtures__/v4-deprecated-signatures/send-file.output.ts
@@ -3,4 +3,14 @@
 import sendfile from "other-place"
+import rateLimit from "express-rate-limit";
 
 const app = express();
+
+// set up rate limiter: maximum of 100 requests per 15 minutes
+const limiter = rateLimit({
+  windowMs: 15 * 60 * 1000, // 15 minutes
+  max: 100, // limit each IP to 100 requests per windowMs
+});
+
+// apply rate limiter to all requests
+app.use(limiter);
 const options = {
EOF
@@ -3,4 +3,14 @@
import sendfile from "other-place"
import rateLimit from "express-rate-limit";

const app = express();

// set up rate limiter: maximum of 100 requests per 15 minutes
const limiter = rateLimit({
windowMs: 15 * 60 * 1000, // 15 minutes
max: 100, // limit each IP to 100 requests per windowMs
});

// apply rate limiter to all requests
app.use(limiter);
const options = {
package.json
Outside changed files

Autofix patch

Autofix patch
Run the following command in your local git repository to apply this patch
cat << 'EOF' | git apply
diff --git a/package.json b/package.json
--- a/package.json
+++ b/package.json
@@ -4,3 +4,6 @@
   "description": "Codemods for updating express servers.",
-  "contributors": ["Sebastian Beltran <bjohansebas@gmail.com>", "Filip Kudla <filip.kudla.dev@gmail.com>"],
+  "contributors": [
+    "Sebastian Beltran <bjohansebas@gmail.com>",
+    "Filip Kudla <filip.kudla.dev@gmail.com>"
+  ],
   "license": "MIT",
@@ -13,4 +16,9 @@
   },
-  "keywords": ["codemods", "express"],
-  "files": ["build"],
+  "keywords": [
+    "codemods",
+    "express"
+  ],
+  "files": [
+    "build"
+  ],
   "scripts": {
@@ -30,3 +38,4 @@
     "picocolors": "^1.1.1",
-    "prompts": "^2.4.2"
+    "prompts": "^2.4.2",
+    "express-rate-limit": "^7.5.0"
   },
EOF
@@ -4,3 +4,6 @@
"description": "Codemods for updating express servers.",
"contributors": ["Sebastian Beltran <bjohansebas@gmail.com>", "Filip Kudla <filip.kudla.dev@gmail.com>"],
"contributors": [
"Sebastian Beltran <bjohansebas@gmail.com>",
"Filip Kudla <filip.kudla.dev@gmail.com>"
],
"license": "MIT",
@@ -13,4 +16,9 @@
},
"keywords": ["codemods", "express"],
"files": ["build"],
"keywords": [
"codemods",
"express"
],
"files": [
"build"
],
"scripts": {
@@ -30,3 +38,4 @@
"picocolors": "^1.1.1",
"prompts": "^2.4.2"
"prompts": "^2.4.2",
"express-rate-limit": "^7.5.0"
},
This fix introduces these dependencies
Package Version Security advisories
express-rate-limit (npm) 7.5.0 None
Copilot is powered by AI and may make mistakes. Always verify output.
Unable to commit as this autofix suggestion is now outdated
@bjohansebas bjohansebas requested a review from kjugi March 16, 2025 01:06
@bjohansebas bjohansebas requested a review from Copilot March 29, 2025 18:26
Copilot AI reviewed Mar 29, 2025
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Pull Request Overview

This PR fixes a bug in the transformer for res.del to ensure that when the first argument is a function it is not modified to res.delete, and it expands test coverage for various response methods.

  • Correctly update the transformer for res.del so that only calls with a RegExp, string, or array as the first argument are changed.
  • Add new test fixtures for send, sendFile, redirect, json, jsonp, and delete endpoints to capture the updated behavior.

Reviewed Changes

Copilot reviewed 13 out of 13 changed files in this pull request and generated no comments.

Show a summary per file
File Description
transforms/v4-deprecated-signatures.ts Adjusts the call expression search and conditional logic to avoid modifying res.del when the first argument is a function.
transforms/testfixtures/v4-deprecated-signatures/send*.ts Updates tests for res.send to account for separation of status and body.
transforms/testfixtures/v4-deprecated-signatures/send-file*.ts Updates tests to verify the renaming of res.sendfile to res.sendFile.
transforms/testfixtures/v4-deprecated-signatures/redirect*.ts Updates tests to ensure proper parameter order in res.redirect calls.
transforms/testfixtures/v4-deprecated-signatures/json*.ts Updates tests to check the new handling of res.json and res.jsonp calls.
transforms/testfixtures/v4-deprecated-signatures/delete*.ts Adds test cases to verify that calls to app.del with a function argument are preserved.
Comments suppressed due to low confidence (1)

transforms/v4-deprecated-signatures.ts:107

  • [nitpick] Even though the current condition correctly skips transformation for function arguments, it might be clearer and more future-proof to explicitly check for function types (e.g. 'FunctionExpression' or 'ArrowFunctionExpression') to document the intent and avoid accidental modifications if new AST node types are introduced.
if (pathArguments[0].type !== 'RegExpLiteral' && pathArguments[0].type !== 'StringLiteral' && pathArguments[0].type !== 'ArrayExpression')

@bjohansebas bjohansebas merged commit ba27814 into main Mar 29, 2025
@bjohansebas bjohansebas deleted the more-tests branch March 29, 2025 18:54
@bjohansebas bjohansebas mentioned this pull request Mar 29, 2025
Merged
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@bjohansebas @github-advanced-security