Supabase Integration#5
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Note
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| Cohort / File(s) | Summary |
|---|---|
Dependencies package.json |
Added @supabase/ssr (^0.10.2) and @supabase/supabase-js (^2.103.0); newline added at EOF. |
Server Supabase & Middleware src/lib/supabase/server.ts, src/middleware.ts |
Added server-side SSR client factory using Next.js cookies() and middleware that initializes SSR client, synchronizes cookies to the response, and invokes supabase.auth.getUser(). |
Client Supabase src/lib/supabase/client.ts, src/lib/hooks/useAuth.ts |
Added createClient() creating a browser Supabase client from NEXT_PUBLIC env vars and a useAuth hook that fetches session, tracks loading, and subscribes to auth state changes. |
Auth API Routes src/app/api/auth/login/route.ts, src/app/api/auth/signup/route.ts |
Added POST handlers parsing JSON, validating email/password, calling supabase.auth.signInWithPassword / signUp, and returning appropriate JSON error or success responses. |
Supabase Local Config supabase/config.toml, supabase/.gitignore |
Added comprehensive local Supabase configuration and .gitignore entries for Supabase temp and env files. |
Sequence Diagram
sequenceDiagram
participant Browser as User Browser
participant Client as Next.js Client
participant Middleware as Next.js Middleware
participant API as Next.js API Route
participant Supabase as Supabase Server
Browser->>Client: Submit credentials (signup/login)
Client->>API: POST /api/auth/(signup|login) with JSON
API->>Middleware: request passes through (middleware initializes SSR client)
Middleware->>Supabase: createServerClient + sync cookies
API->>Supabase: supabase.auth.signUp / signInWithPassword
Supabase-->>API: { data } or { error }
API-->>Browser: JSON response (success or error)
Estimated code review effort
🎯 3 (Moderate) | ⏱️ ~25 minutes
Poem
🐰 I hopped through code with a tiny hop,
I stitched the cookies and polished the top.
Signup and login, a carrot in sight,
Sessions snug under moonlit byte.
— your jubilant rabbit
🚥 Pre-merge checks | ✅ 2 | ❌ 1
❌ Failed checks (1 warning)
| Check name | Status | Explanation | Resolution |
|---|---|---|---|
| Docstring Coverage | Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. | Write docstrings for the functions missing them to satisfy the coverage threshold. |
✅ Passed checks (2 passed)
| Check name | Status | Explanation |
|---|---|---|
| Description Check | ✅ Passed | Check skipped - CodeRabbit’s high-level summary is enabled. |
| Title check | ✅ Passed | The title 'Supabase Integration' accurately reflects the main change—adding Supabase authentication infrastructure—but is somewhat broad and generic, covering multiple components without highlighting the most specific aspect. |
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Actionable comments posted: 6
🧹 Nitpick comments (1)
supabase/config.toml (1)
216-220: Add guardrails for non-local environments on relaxed email auth settings.At Line 216, Line 218, and Line 220, email confirmation is off, secure password change is off, and resend interval is
1s. If this config leaks into shared envs, auth posture is weak. Recommend documenting this as strictly local/testing or parameterizing these values via env-specific config.🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed. In `@supabase/config.toml` around lines 216 - 220, The config currently disables email confirmations (enable_confirmations), disables secure password change (secure_password_change), and sets a 1s resend interval (max_frequency) which are safe only for local/testing; update these settings so they are either documented as strictly local/testing and moved into a local-only config, or parameterized behind environment-specific controls (e.g., require an explicit DEV_ONLY env flag before allowing enable_confirmations=false, secure_password_change=false, max_frequency="1s"); change defaults to secure values for shared/staging/prod (enable_confirmations=true, secure_password_change=true, reasonable max_frequency like "1m" or configurable) and add a short comment near enable_confirmations / secure_password_change / max_frequency warning that the relaxed values must not be used outside local dev without explicit opt-in via an env variable.
🤖 Prompt for all review comments with AI agents
Verify each finding against the current code and only fix it if needed.
Inline comments:
In `@src/app/api/auth/login/route.ts`:
- Around line 6-23: The route handler currently calls request.json() and
proceeds to auth without validating the payload; update the handler around the
request.json() call in the route (the code that extracts { email, password }) to
explicitly validate the parsed body: wrap request.json() in its own try/catch to
catch malformed JSON and return NextResponse.json({ error: "Invalid JSON" }, {
status: 400 }); then validate that email and password exist and are strings
(e.g., if (!email || typeof email !== "string" || !password || typeof password
!== "string") return NextResponse.json({ error: "Missing or invalid credentials"
}, { status: 400 });) before calling supabase.auth.signInWithPassword so
credential errors remain 400 and unexpected exceptions still fall through to the
existing 500 catch.
In `@src/app/api/auth/signup/route.ts`:
- Around line 6-23: The signup handler currently trusts await request.json() and
the destructured { email, password } which can throw or yield invalid payloads
and push malformed requests into the 500 catch; update the logic around
request.json(), validate the parsed body before calling supabase.auth.signUp
(ensure email and password exist, are strings, and optionally validate email
format and password length/constraints), return NextResponse.json({ error:
"Invalid request" }, { status: 400 }) for malformed JSON or invalid credentials,
and only let unexpected exceptions fall through to the existing 500 catch;
locate and modify the code around request.json(), the destructuring of { email,
password }, the call to supabase.auth.signUp, and the NextResponse error returns
to implement these checks.
In `@src/lib/hooks/useAuth.ts`:
- Around line 10-27: The supabase client is being recreated each render causing
the useEffect (which depends on supabase.auth) to re-run and repeatedly
subscribe; wrap createClient() in useMemo (e.g. const supabase = useMemo(() =>
createClient(), [])) to stabilize the instance, change the effect dependency to
[supabase], replace the getSession().then(...) call with
getSession().then(...).finally(() => setLoading(false)) to guarantee loading is
cleared, and keep the auth change listener via
supabase.auth.onAuthStateChange(...) with the same cleanup return () =>
subscription?.unsubscribe().
In `@src/middleware.ts`:
- Around line 26-29: The middleware currently awaits supabase.auth.getUser()
with no error handling which can throw and block requests; wrap the await
supabase.auth.getUser() call in a try/catch inside the middleware, ignore the
call's result (since it isn't used), and on error log the exception (e.g.,
console.error or your process logger) and proceed to return supabaseResponse so
transient auth failures don't break matched requests.
- Around line 33-42: Update the middleware matcher pattern in src/middleware.ts
(the "matcher" array entry) to exclude auth routes and additional static asset
extensions so supabase.auth.getUser() does not run for them; specifically adjust
the existing regex "/((?!_next/static|_next/image|favicon.ico|.*\\.svg).*)" to
also negative-match "/api/auth/login" and "/api/auth/signup" and file extensions
like .png, .jpg, .jpeg, .gif, .webp, .txt, .xml (and .svg if not already
covered), ensuring the middleware only runs for intended dynamic routes.
In `@supabase/config.toml`:
- Around line 154-157: site_url and additional_redirect_urls have mismatched
schemes which will break Supabase auth exact-match checks; update the entries so
their schemes match exactly (either change additional_redirect_urls to
"http://127.0.0.1:3000" to match site_url, or change site_url to
"https://127.0.0.1:3000" if you intend HTTPS), and ensure the host and port
remain identical for the values referenced by site_url and
additional_redirect_urls.
---
Nitpick comments:
In `@supabase/config.toml`:
- Around line 216-220: The config currently disables email confirmations
(enable_confirmations), disables secure password change
(secure_password_change), and sets a 1s resend interval (max_frequency) which
are safe only for local/testing; update these settings so they are either
documented as strictly local/testing and moved into a local-only config, or
parameterized behind environment-specific controls (e.g., require an explicit
DEV_ONLY env flag before allowing enable_confirmations=false,
secure_password_change=false, max_frequency="1s"); change defaults to secure
values for shared/staging/prod (enable_confirmations=true,
secure_password_change=true, reasonable max_frequency like "1m" or configurable)
and add a short comment near enable_confirmations / secure_password_change /
max_frequency warning that the relaxed values must not be used outside local dev
without explicit opt-in via an env variable.
🪄 Autofix (Beta)
Fix all unresolved CodeRabbit comments on this PR:
- Push a commit to this branch (recommended)
- Create a new PR with the fixes
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⛔ Files ignored due to path filters (1)
package-lock.jsonis excluded by!**/package-lock.json
📒 Files selected for processing (9)
package.jsonsrc/app/api/auth/login/route.tssrc/app/api/auth/signup/route.tssrc/lib/hooks/useAuth.tssrc/lib/supabase/client.tssrc/lib/supabase/server.tssrc/middleware.tssupabase/.gitignoresupabase/config.toml
| matcher: [ | ||
| /* | ||
| * Match all request paths except for the ones starting with: | ||
| * - _next/static (static files) | ||
| * - _next/image (image optimization files) | ||
| * - favicon.ico (favicon file) | ||
| * - public folder | ||
| */ | ||
| "/((?!_next/static|_next/image|favicon.ico|.*\\.svg).*)", | ||
| ], |
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current = r"/((?!_next/static|_next/image|favicon.ico|.*\.svg).*)"
# Proposed pattern from fix
proposed = r"/((?!_next/static|_next/image|favicon.ico|api/auth|.*\.(?:svg|png|jpg|jpeg|gif|webp|ico|txt|xml)$).*)"
# Test various paths
test_paths = [
"/",
"/dashboard",
"/api/auth/login",
"/api/auth/signup",
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"/robots.txt",
"/sitemap.xml",
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Matcher scope is too broad for static/public assets and auth endpoints.
The current pattern unnecessarily runs the supabase.auth.getUser() async operation on requests to /api/auth/login, /api/auth/signup, and static assets like .png, .jpg, .gif, .webp, .txt, and .xml files. This adds unnecessary latency to these requests.
Proposed fix
- "/((?!_next/static|_next/image|favicon.ico|.*\\.svg).*)",
+ "/((?!_next/static|_next/image|favicon.ico|api/auth|.*\\.(?:svg|png|jpg|jpeg|gif|webp|ico|txt|xml)$).*)",🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed.
In `@src/middleware.ts` around lines 33 - 42, Update the middleware matcher
pattern in src/middleware.ts (the "matcher" array entry) to exclude auth routes
and additional static asset extensions so supabase.auth.getUser() does not run
for them; specifically adjust the existing regex
"/((?!_next/static|_next/image|favicon.ico|.*\\.svg).*)" to also negative-match
"/api/auth/login" and "/api/auth/signup" and file extensions like .png, .jpg,
.jpeg, .gif, .webp, .txt, .xml (and .svg if not already covered), ensuring the
middleware only runs for intended dynamic routes.
| site_url = "http://127.0.0.1:3000" | ||
| # A list of *exact* URLs that auth providers are permitted to redirect to post authentication. | ||
| additional_redirect_urls = ["https://127.0.0.1:3000"] | ||
| # How long tokens are valid for, in seconds. Defaults to 3600 (1 hour), maximum 604,800 (1 week). |
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🌐 Web query:
Supabase auth redirect URL exact matching scheme validation
💡 Result:
Supabase Auth performs exact matching, including the scheme (http/https/custom), for redirect URL validation against the configured allow list (Site URL and Additional Redirect URLs). The provided redirectTo URL must match one of the allowed patterns precisely, including protocol/scheme, host, and path (with wildcard support for paths/domains but scheme is part of the pattern). Mismatches in scheme, such as http vs https, will fail validation, causing fallback to the Site URL. Examples from docs: http://localhost:3000/* matches only http scheme, not https. Normalization handles trailing slashes, but scheme remains exact. This is a security feature to prevent open redirects.
Citations:
- 1: https://supabase.com/docs/guides/auth/redirect-urls
- 2: https://supabase.io/docs/guides/auth/redirect-urls
- 3: https://supabase.com/docs/guides/troubleshooting/why-am-i-being-redirected-to-the-wrong-url-when-using-auth-redirectto-option-_vqIeO
- 4: 3rd Party OAuth redirectTo doesn't respect Additional Redirect URLs supabase/supabase#3069
- 5: [auth] Additional Redirect URLs outside of Site URL not supported supabase/supabase#2623
- 6: fix: allow all URL forms in redirects supabase/auth#711
- 7: feat: Normalize redirection URLs and globs supabase/auth#535
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Fix redirect URL scheme mismatch to prevent auth callback rejection.
site_url at Line 154 is http://127.0.0.1:3000, but additional_redirect_urls at Line 156 is https://127.0.0.1:3000. Supabase auth performs exact URL matching including the scheme (http/https), so this mismatch will cause auth callback validation to fail and redirect to the fallback Site URL instead.
Suggested fix
-site_url = "http://127.0.0.1:3000"
-additional_redirect_urls = ["https://127.0.0.1:3000"]
+site_url = "http://127.0.0.1:3000"
+additional_redirect_urls = ["http://127.0.0.1:3000"]📝 Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| site_url = "http://127.0.0.1:3000" | |
| # A list of *exact* URLs that auth providers are permitted to redirect to post authentication. | |
| additional_redirect_urls = ["https://127.0.0.1:3000"] | |
| # How long tokens are valid for, in seconds. Defaults to 3600 (1 hour), maximum 604,800 (1 week). | |
| site_url = "http://127.0.0.1:3000" | |
| # A list of *exact* URLs that auth providers are permitted to redirect to post authentication. | |
| additional_redirect_urls = ["http://127.0.0.1:3000"] | |
| # How long tokens are valid for, in seconds. Defaults to 3600 (1 hour), maximum 604,800 (1 week). |
🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed.
In `@supabase/config.toml` around lines 154 - 157, site_url and
additional_redirect_urls have mismatched schemes which will break Supabase auth
exact-match checks; update the entries so their schemes match exactly (either
change additional_redirect_urls to "http://127.0.0.1:3000" to match site_url, or
change site_url to "https://127.0.0.1:3000" if you intend HTTPS), and ensure the
host and port remain identical for the values referenced by site_url and
additional_redirect_urls.
CodeRabbit suggestion Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>
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Actionable comments posted: 2
🤖 Prompt for all review comments with AI agents
Verify each finding against the current code and only fix it if needed.
Inline comments:
In `@src/app/api/auth/login/route.ts`:
- Around line 47-48: There is an unmatched closing brace in the login route file
— remove the extra `}` that appears just before the final closing brace so the
function/block in src/app/api/auth/login/route.ts (the login route handler) has
balanced braces; keep the final `}` that ends the function/exports and delete
the stray closing brace immediately preceding it.
- Around line 13-27: The destructuring of body in the login route can throw when
body is null; before unpacking email and password (the const { email, password }
= body in route.ts inside the login handler), first check that body is a
non-null object (e.g. typeof body === "object" && body !== null) and return
NextResponse.json({ error: "Email and password are required" }, { status: 400 })
if it fails; only then destructure and run the existing string/emptiness checks
for email/password to ensure null JSON bodies yield a 400 rather than a 500.
🪄 Autofix (Beta)
Fix all unresolved CodeRabbit comments on this PR:
- Push a commit to this branch (recommended)
- Create a new PR with the fixes
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src/app/api/auth/login/route.ts
| const { email, password } = body as { | ||
| email?: unknown; | ||
| password?: unknown; | ||
| }; | ||
| if ( | ||
| typeof email !== "string" || | ||
| typeof password !== "string" || | ||
| !email || | ||
| !password | ||
| ) { | ||
| return NextResponse.json( | ||
| { error: "Email and password are required" }, | ||
| { status: 400 } | ||
| ); | ||
| } |
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Guard body shape before destructuring to avoid 500 on null.
At Line 13, destructuring body occurs before confirming it is a non-null object. When a request body is JSON null, it passes the JSON parsing check (Line 8) but causes a destructuring error on Line 13, which bubbles up to the outer catch block (Line 41) and returns 500 instead of 400.
Add a guard to validate body is a non-null object before destructuring:
Proposed fix
let body: unknown;
try {
body = await request.json();
} catch {
return NextResponse.json({ error: "Invalid JSON body" }, { status: 400 });
}
+ if (typeof body !== "object" || body === null) {
+ return NextResponse.json({ error: "Invalid request body" }, { status: 400 });
+ }
+
const { email, password } = body as {
email?: unknown;
password?: unknown;
};📝 Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| const { email, password } = body as { | |
| email?: unknown; | |
| password?: unknown; | |
| }; | |
| if ( | |
| typeof email !== "string" || | |
| typeof password !== "string" || | |
| !email || | |
| !password | |
| ) { | |
| return NextResponse.json( | |
| { error: "Email and password are required" }, | |
| { status: 400 } | |
| ); | |
| } | |
| let body: unknown; | |
| try { | |
| body = await request.json(); | |
| } catch { | |
| return NextResponse.json({ error: "Invalid JSON body" }, { status: 400 }); | |
| } | |
| if (typeof body !== "object" || body === null) { | |
| return NextResponse.json({ error: "Invalid request body" }, { status: 400 }); | |
| } | |
| const { email, password } = body as { | |
| email?: unknown; | |
| password?: unknown; | |
| }; | |
| if ( | |
| typeof email !== "string" || | |
| typeof password !== "string" || | |
| !email || | |
| !password | |
| ) { | |
| return NextResponse.json( | |
| { error: "Email and password are required" }, | |
| { status: 400 } | |
| ); | |
| } |
🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed.
In `@src/app/api/auth/login/route.ts` around lines 13 - 27, The destructuring of
body in the login route can throw when body is null; before unpacking email and
password (the const { email, password } = body in route.ts inside the login
handler), first check that body is a non-null object (e.g. typeof body ===
"object" && body !== null) and return NextResponse.json({ error: "Email and
password are required" }, { status: 400 }) if it fails; only then destructure
and run the existing string/emptiness checks for email/password to ensure null
JSON bodies yield a 400 rather than a 500.
![github-advanced-security[bot]](https://avatars.githubusercontent.com/in/57789?s=60&v=4){kind=small}
middleware error handling Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>
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Actionable comments posted: 1
♻️ Duplicate comments (1)
src/app/api/auth/signup/route.ts (1)
71-71:⚠️ Potential issue | 🟡 MinorRemove the unused catch binding.
At Line 71,
erroris never used and triggers@typescript-eslint/no-unused-vars.Proposed fix
- } catch (error) { + } catch { return NextResponse.json( { error: "Internal server error" }, { status: 500 } ); }#!/bin/bash set -euo pipefail # Verify there are no unused catch bindings in this route. rg -n -C2 'catch\\s*\\(\\s*error\\s*\\)' src/app/api/auth/signup/route.ts || trueExpected result: no match after fix.
🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed. In `@src/app/api/auth/signup/route.ts` at line 71, The catch clause in the signup route's POST handler currently declares an unused binding as "catch (error)" which triggers the linter; remove the unused binding by changing the clause to "catch {", i.e. update the try/catch in the POST handler (look for the "catch (error)" occurrence) so the catch block has no parameter; no other logic changes are required.
🤖 Prompt for all review comments with AI agents
Verify each finding against the current code and only fix it if needed.
Inline comments:
In `@src/app/api/auth/signup/route.ts`:
- Around line 43-44: The current emailRegex and its use (emailRegex.test(email))
in the signup route are vulnerable to catastrophic backtracking; replace this
with a deterministic, linear-time validation: ensure exactly one '@' using
indexOf/lastIndexOf, verify non-empty local and domain parts, ensure domain
contains at least one '.' not at start/end, and reject any whitespace
characters; alternatively use a vetted library (e.g., validator.isEmail) and
call it from the same signup handler where emailRegex is referenced.
---
Duplicate comments:
In `@src/app/api/auth/signup/route.ts`:
- Line 71: The catch clause in the signup route's POST handler currently
declares an unused binding as "catch (error)" which triggers the linter; remove
the unused binding by changing the clause to "catch {", i.e. update the
try/catch in the POST handler (look for the "catch (error)" occurrence) so the
catch block has no parameter; no other logic changes are required.
🪄 Autofix (Beta)
Fix all unresolved CodeRabbit comments on this PR:
- Push a commit to this branch (recommended)
- Create a new PR with the fixes
ℹ️ Review info
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📒 Files selected for processing (2)
src/app/api/auth/signup/route.tssrc/lib/hooks/useAuth.ts
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Pull Request
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useAuth.tsType of Change
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