pr-issue-validator.yaml

name: Validate Pull Request

on:
  pull_request:
    types:
      - opened
      - synchronize
      - edited
      - reopened
    branches:    
      - 'main'
      - 'release-**'
      - 'develop'
  
jobs:
  validate-PR-issue:
    runs-on: ubuntu-latest
    permissions:
      issues: write
      contents: read
      pull-requests: write
    steps:
    - name: Checkout repository
      uses: actions/checkout@v2

    - name: Validate Issue Reference
      env:
        GH_TOKEN: ${{ github.token }}
        PR_BODY: ${{ github.event.pull_request.body }}
        PRNUM: ${{ github.event.pull_request.number }}
        TITLE: ${{ github.event.pull_request.title }}
      run: |
        set -x    
        # Skip validation for documentation or chore PRs
        if [[ "$TITLE" =~ ^(doc:|docs:|chore:|misc:) ]]; then
          echo "Skipping validation for docs/chore PR."
          echo "PR NUMBER-: $PRNUM "
          gh pr edit $PRNUM --remove-label "PR:Issue-verification-failed"
          gh pr edit $PRNUM --add-label "PR:Ready-to-Review"
          exit 0
        fi
    
        # Define all issue matching patterns
        patterns=(
          "((Fixes|Resolves) #[0-9]+)" 
          "((Fixes|Resolves) https://github.com/devtron-labs/devtron/issues/[0-9]+)" 
          "((Fixes|Resolves) devtron-labs/devtron#[0-9]+)"
          "(Fixes|Resolves):?\\s+\\[#([0-9]+)\\]" 
          "((Fixes|Resolves):? #devtron-labs/devops-sprint/issues/[0-9]+)"
          "((Fixes|Resolves):? #devtron-labs/sprint-tasks/issues/[0-9]+)" 
          "((Fixes|Resolves) https://github.com/devtron-labs/devops-sprint/issues/[0-9]+)"
          "((Fixes|Resolves) https://github.com/devtron-labs/sprint-tasks/issues/[0-9]+)"
          "((Fixes|Resolves):? #devtron-labs/sprint-tasks#[0-9]+)" 
        )
    
        # Extract issue number and repo from PR body
        extract_issue_number() {
          local pattern="$1"  # Get the pattern as the first argument to the function

          # Check if PR_BODY matches the provided pattern using Bash's =~ regex operator
          if [[ "$PR_BODY" =~ $pattern ]]; then
            echo "matched for this pattern $pattern"
            
            issue_num=$(echo "$PR_BODY" | grep -oE "$pattern" | grep -oE "[0-9]+")

            # Extract the repository name (e.g., devtron-labs/devtron) from PR_BODY using grep
            repo=$(echo "$PR_BODY" | grep -oE "devtron-labs/[a-zA-Z0-9_-]+")
            echo "Extracted issue number: $issue_num from repo: $repo"

            return 0  # Return success
          else
            echo "No match for the pattern $pattern"
          fi
          return 1  # Return failure if no match
        }
    
        issue_num=""
        repo="devtron-labs/devtron"  # Default repo
        for pattern in "${patterns[@]}"; do
          echo "Now checking for $pattern"
          extract_issue_number "$pattern" && break
        done
    
        if [[ -z "$issue_num" ]]; then
          echo "No valid issue number found."
          gh pr edit $PRNUM --add-label "PR:Issue-verification-failed"
          gh pr edit $PRNUM --remove-label "PR:Ready-to-Review"
          exit 1
        fi
    
        # Form the issue API URL dynamically
        issue_api_url="https://api.github.com/repos/$repo/issues/$issue_num"
        echo "API URL: $issue_api_url"
    
        # Check if the issue exists in the private repo
        response_code=$(curl -s -o /dev/null -w "%{http_code}" \
          --header "authorization: Bearer ${{ secrets.GH_PR_VALIDATOR_TOKEN }}" \
          "$issue_api_url")
          
        if [[ "$response_code" -eq 200 ]]; then
          echo "Issue #$issue_num is valid and exists in $repo."

          # Fetch the current state of the issue (open/closed) from the private repository.
          issue_status=$(curl -s \
            --header "authorization: Bearer ${{ secrets.GH_PR_VALIDATOR_TOKEN }}" \
            "$issue_api_url" | jq '.state'|tr -d \")
          # Check if the issue is still open.
          if [[ "$issue_status" == open ]]; then
            echo "Issue #$issue_num is opened."
            # Remove the 'Issue-verification-failed' label (if present) and add 'Ready-to-Review'.
            gh pr edit $PRNUM --remove-label "PR:Issue-verification-failed"
            gh pr edit $PRNUM --add-label "PR:Ready-to-Review"
          else
            echo "Issue #$issue_num is closed. Please link an open issue to proceed."
            # Add a comment to the PR indicating the issue is not linked correctly.
            gh pr comment $PRNUM --body "PR is  linked to a closed issue. Please link an open issue to proceed."

            # Add the 'Issue-verification-failed' label and remove 'Ready-to-Review'.
            gh pr edit $PRNUM --add-label "PR:Issue-verification-failed"
            gh pr edit $PRNUM --remove-label "PR:Ready-to-Review"
            exit 1
          fi
        else
          echo "Issue not found. Invalid URL or issue number."
          # Add a comment to the PR indicating the issue is not linked correctly.
          gh pr comment $PRNUM --body "PR is not linked to a valid issue. Please update the issue link."
          
          # Apply 'Issue-verification-failed' label and remove 'Ready-to-Review' label.
          gh pr edit $PRNUM --add-label "PR:Issue-verification-failed"
          gh pr edit $PRNUM --remove-label "PR:Ready-to-Review"
          exit 1
        fi