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Merged
Kbhat1 merged 4 commits into from
Oct 9, 2025
Merged

Codex AI Reviewer #295

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Codex AI Reviewer
Kbhat1 Oct 9, 2025
f0f6074
Remove contributors restriction
Kbhat1 Oct 9, 2025
fffe9ef
Add back restriction
Kbhat1 Oct 9, 2025
49df598
Add back check
Kbhat1 Oct 9, 2025
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207 changes: 207 additions & 0 deletions .github/workflows/pr-to-slack-codex.yml
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name: PR → Codex review → Slack

on:
pull_request:
types: [opened, reopened, ready_for_review]

jobs:
codex_review:
# Run only for trusted contributors
if: ${{ contains(fromJSON('["OWNER","MEMBER","COLLABORATOR","CONTRIBUTOR"]'), github.event.pull_request.author_association) }}

runs-on: ubuntu-latest
timeout-minutes: 15
permissions:
contents: read
pull-requests: write

steps:
- name: Checkout PR HEAD (full history)
uses: actions/checkout@v4
with:
ref: ${{ github.event.pull_request.head.sha }}
fetch-depth: 0

- uses: actions/setup-node@v4
with:
node-version: '22'

- name: Install Codex CLI
run: npm i -g @openai/codex

- name: Codex login
env:
OPENAI_API_KEY: ${{ secrets.OPENAI_API_KEY }}
run: |
set -euo pipefail
echo "$OPENAI_API_KEY" | codex login --with-api-key

- name: Compute merge-base diff (compact)
run: |
set -euo pipefail
BASE_REF='${{ github.event.pull_request.base.ref }}'
git fetch --no-tags origin "$BASE_REF":"refs/remotes/origin/$BASE_REF"
MB=$(git merge-base "origin/$BASE_REF" HEAD)
git diff --unified=0 "$MB"..HEAD > pr.diff
git --no-pager diff --stat "$MB"..HEAD > pr.stat || true

- name: Build prompt and run Codex (guard + fallback)
env:
PR_URL: ${{ github.event.pull_request.html_url }}
PR_NUMBER: ${{ github.event.pull_request.number }}
run: |
set -euo pipefail
MAX=${MAX_DIFF_BYTES:-900000} # ~0.9MB ceiling; override via env if needed

BYTES=$(wc -c < pr.diff || echo 0)
echo "pr.diff size: $BYTES bytes (limit: $MAX)"

# Common prelude for AppSec review
{
echo "You are a skilled AppSec reviewer. Analyze this PR for:"
echo "bugs, vulnerabilities, loss of funds issues, crypto attack vectors, signature vulnerability, replay attacks etc.."
echo "Think deeply. Prioritize the *changed hunks* in pr.diff, but open any other files"
echo "in the checkout as needed for context."
echo
echo "Return a tight executive summary, then bullets with:"
echo "- severity (high/med/low)"
echo "- file:line pointers"
echo "- concrete fixes & example patches"
echo '- if N/A, say "No significant issues found."'
echo
echo "PR URL: $PR_URL"
echo
echo "Formatting requirements:"
echo "- Output MUST be GitHub-flavored Markdown (GFM)."
echo "- Start with '## Executive summary' (one short paragraph)."
echo "- Then '## Findings and fixes' as a bullet list."
echo "- Use fenced code blocks for patches/configs with language tags (diff, yaml, etc.)."
echo "- Use inline code for file:line and identifiers."
} > prompt.txt

if [ "$BYTES" -le "$MAX" ] && [ "$BYTES" -gt 0 ]; then
echo "Using embedded diff path (<= $MAX bytes)"
{
echo "Unified diff (merge-base vs HEAD):"
echo '```diff'
cat pr.diff
echo '```'
} >> prompt.txt

echo "---- prompt head ----"; head -n 40 prompt.txt >&2
echo "---- prompt size ----"; wc -c prompt.txt >&2

# Run Codex with a scrubbed env: only OPENAI_API_KEY, PATH, HOME
env -i OPENAI_API_KEY="${{ secrets.OPENAI_API_KEY }}" PATH="$PATH" HOME="$HOME" \
codex --model gpt-5-codex --ask-for-approval never exec \
--sandbox read-only \
--output-last-message review.md \
< prompt.txt \
> codex.log 2>&1

else
echo "Large diff – switching to fallback that lets Codex fetch the .diff URL"
# Recompute merge-base and HEAD for clarity in the prompt
BASE_REF='${{ github.event.pull_request.base.ref }}'
git fetch --no-tags origin "$BASE_REF":"refs/remotes/origin/$BASE_REF"
MB=$(git merge-base "origin/$BASE_REF" HEAD)
HEAD_SHA=$(git rev-parse HEAD)
DIFF_URL="${PR_URL}.diff"

{
echo "The diff is too large to embed safely in this CI run."
echo "Please fetch and analyze the diff from this URL:"
echo "$DIFF_URL"
echo
echo "Commit range (merge-base...HEAD):"
echo "merge-base: $MB"
echo "head: $HEAD_SHA"
echo
echo "For quick orientation, here is the diffstat:"
echo '```'
cat pr.stat || true
echo '```'
echo
echo "After fetching the diff, continue with the same review instructions above."
} >> prompt.txt

echo "---- fallback prompt head ----"; head -n 80 prompt.txt >&2
echo "---- fallback prompt size ----"; wc -c prompt.txt >&2

# Network-enabled only for this large-diff case; still scrub env
env -i OPENAI_API_KEY="${{ secrets.OPENAI_API_KEY }}" PATH="$PATH" HOME="$HOME" \
codex --model gpt-5-codex --ask-for-approval never exec \
--sandbox danger-full-access \
--output-last-message review.md \
< prompt.txt \
> codex.log 2>&1
fi

# Defensive: ensure later steps don't explode
if [ ! -s review.md ]; then
echo "_Codex produced no output._" > review.md
fi

- name: Post parent message in Slack (blocks)
id: post_parent
env:
SLACK_BOT_TOKEN: ${{ secrets.SLACK_BOT_TOKEN }}
SLACK_CHANNEL_ID: ${{ secrets.SLACK_CHANNEL_ID }}
run: |
resp=$(curl -s -X POST https://slack.com/api/chat.postMessage \
-H "Authorization: Bearer $SLACK_BOT_TOKEN" \
-H 'Content-type: application/json; charset=utf-8' \
--data "$(jq -n \
--arg ch "$SLACK_CHANNEL_ID" \
--arg n "${{ github.event.pull_request.number }}" \
--arg t "${{ github.event.pull_request.title }}" \
--arg a "${{ github.event.pull_request.user.login }}" \
--arg u "${{ github.event.pull_request.html_url }}" \
'{
channel: $ch,
text: ("PR #" + $n + ": " + $t),
blocks: [
{ "type":"section", "text":{"type":"mrkdwn","text":("*PR #"+$n+":* "+$t)} },
{ "type":"section", "text":{"type":"mrkdwn","text":("• Author: "+$a)} },
{ "type":"section", "text":{"type":"mrkdwn","text":("• Link: <"+$u+">")} }
],
unfurl_links:false, unfurl_media:false
}')" )
echo "ts=$(echo "$resp" | jq -r '.ts')" >> "$GITHUB_OUTPUT"

- name: Thread reply with review (upload via Slack external upload API)
env:
SLACK_BOT_TOKEN: ${{ secrets.SLACK_BOT_TOKEN }}
SLACK_CHANNEL_ID: ${{ secrets.SLACK_CHANNEL_ID }}
TS: ${{ steps.post_parent.outputs.ts }}
run: |
set -euo pipefail

# robust byte count (works on Linux & macOS)
BYTES=$( (stat -c%s review.md 2>/dev/null || stat -f%z review.md 2>/dev/null) )
BYTES=${BYTES:-$(wc -c < review.md | tr -d '[:space:]')}

ticket=$(curl -sS -X POST https://slack.com/api/files.getUploadURLExternal \
-H "Authorization: Bearer $SLACK_BOT_TOKEN" \
-H "Content-type: application/x-www-form-urlencoded" \
--data-urlencode "filename=codex_review.md" \
--data "length=$BYTES" \
--data "snippet_type=markdown")
echo "$ticket"
upload_url=$(echo "$ticket" | jq -r '.upload_url')
file_id=$(echo "$ticket" | jq -r '.file_id')
test "$upload_url" != "null" -a "$file_id" != "null" || { echo "getUploadURLExternal failed: $ticket" >&2; exit 1; }

curl -sS -X POST "$upload_url" \
-F "filename=@review.md;type=text/markdown" \
> /dev/null

payload=$(jq -n --arg fid "$file_id" --arg ch "$SLACK_CHANNEL_ID" --arg ts "$TS" \
--arg title "Codex Security Review" --arg ic "Automated Codex review attached." \
'{files:[{id:$fid, title:$title}], channel_id:$ch, thread_ts:$ts, initial_comment:$ic}')
resp=$(curl -sS -X POST https://slack.com/api/files.completeUploadExternal \
-H "Authorization: Bearer $SLACK_BOT_TOKEN" \
-H "Content-type: application/json; charset=utf-8" \
--data "$payload")
echo "$resp"
test "$(echo "$resp" | jq -r '.ok')" = "true" || { echo "files.completeUploadExternal failed: $resp" >&2; exit 1; }