correct origin cors middleware #2
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Reviewer's GuideThis PR refactors the CORS middleware in server.js to replace a hard-coded origin with a dynamic origin function that validates incoming origins against an environment-aware allowlist (production) or a local development URL, and rejects unauthorized origins. Sequence Diagram for CORS Origin ValidationsequenceDiagram
actor Client
participant ExpressApp
participant CORS_Middleware
participant OriginCallback
Client->>ExpressApp: HTTP Request (Origin: example.com)
ExpressApp->>CORS_Middleware: Process request
CORS_Middleware->>OriginCallback: ValidateOrigin("example.com", cb)
OriginCallback->>OriginCallback: Check origin against rules (NODE_ENV, allowlist)
alt Origin Allowed
OriginCallback-->>CORS_Middleware: cb(null, true)
CORS_Middleware-->>ExpressApp: Proceed with request
ExpressApp-->>Client: HTTP 200 OK / Response
else Origin Denied
OriginCallback-->>CORS_Middleware: cb(new Error("Not allowed by CORS"))
CORS_Middleware-->>ExpressApp: Block request
ExpressApp-->>Client: HTTP 403 Forbidden / CORS Error
end
File-Level Changes
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Hey @elhalj - I've reviewed your changes - here's some feedback:
- The nested ternary in the
if (!origin || process.env.NODE_ENV === "production" ? … : …)is hard to read and error‐prone—refactor into explicitif/elseblocks or add parentheses to clarify which condition applies in production vs. development. - As written, a request without an
Originheader will hit the allowlist check and be rejected; if you want to allow non-browser or same-origin calls, handle the!origincase separately before your production/dev logic.
Prompt for AI Agents
Please address the comments from this code review:
## Overall Comments
- The nested ternary in the `if (!origin || process.env.NODE_ENV === "production" ? … : …)` is hard to read and error‐prone—refactor into explicit `if`/`else` blocks or add parentheses to clarify which condition applies in production vs. development.
- As written, a request without an `Origin` header will hit the allowlist check and be rejected; if you want to allow non-browser or same-origin calls, handle the `!origin` case separately before your production/dev logic.
## Individual Comments
### Comment 1
<location> `src/server.js:25` </location>
<code_context>
cors({
- origin: "http://localhost:5173", // Autoriser uniquement votre frontend
+ origin: (origin, callback) => {
+ if (
+ !origin || process.env.NODE_ENV === "production"
+ ? allowlist.includes(origin)
</code_context>
<issue_to_address>
Clarify ternary operator precedence
Consider adding parentheses around the production check or extracting the condition into a named variable to improve readability and prevent misinterpretation.
</issue_to_address>
### Comment 2
<location> `src/server.js:26` </location>
<code_context>
- origin: "http://localhost:5173", // Autoriser uniquement votre frontend
+ origin: (origin, callback) => {
+ if (
+ !origin || process.env.NODE_ENV === "production"
+ ? allowlist.includes(origin)
+ : origin === "http://localhost:5173"
</code_context>
<issue_to_address>
Reconsider allowing requests with no Origin header
Requests without an Origin header are currently permitted, which could allow non-browser clients to bypass CORS. Confirm if this behavior is intended.
</issue_to_address>
### Comment 3
<location> `src/server.js:32` </location>
<code_context>
+ ) {
+ callback(null, true);
+ } else {
+ callback(new Error("Not allowed by CORS"));
+ }
+ },
</code_context>
<issue_to_address>
Use `callback(null, false)` instead of throwing an error
Calling the callback with an error causes a 500 response. Use `callback(null, false)` to reject the request without triggering an internal server error.
</issue_to_address>
<suggested_fix>
<<<<<<< SEARCH
} else {
callback(new Error("Not allowed by CORS"));
}
=======
} else {
callback(null, false);
}
>>>>>>> REPLACE
</suggested_fix>Help me be more useful! Please click 👍 or 👎 on each comment and I'll use the feedback to improve your reviews.
| app.use( | ||
| cors({ | ||
| origin: "http://localhost:5173", // Autoriser uniquement votre frontend | ||
| origin: (origin, callback) => { | ||
| if ( |
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suggestion: Clarify ternary operator precedence
Consider adding parentheses around the production check or extracting the condition into a named variable to improve readability and prevent misinterpretation.
| origin: "http://localhost:5173", // Autoriser uniquement votre frontend | ||
| origin: (origin, callback) => { | ||
| if ( | ||
| !origin || process.env.NODE_ENV === "production" |
There was a problem hiding this comment.
🚨 question (security): Reconsider allowing requests with no Origin header
Requests without an Origin header are currently permitted, which could allow non-browser clients to bypass CORS. Confirm if this behavior is intended.
Comment on lines
+31
to
+33
| } else { | ||
| callback(new Error("Not allowed by CORS")); | ||
| } |
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suggestion (bug_risk): Use callback(null, false) instead of throwing an error
Calling the callback with an error causes a 500 response. Use callback(null, false) to reject the request without triggering an internal server error.
Suggested change
| } else { | |
| callback(new Error("Not allowed by CORS")); | |
| } | |
| } else { | |
| callback(null, false); | |
| } |
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correct cors middleware
Summary by Sourcery
Refine CORS middleware to dynamically validate request origins based on environment and a configurable allowlist
Bug Fixes:
Enhancements: