/.github/workflows/anti-spam.yml

name: Anti-Spam Protection

on:
  issues:
    types: [opened, edited]

permissions:
  issues: write

jobs:
  spam-detection:
    runs-on: ubuntu-latest
    steps:
      - name: Check for spam
        uses: actions/github-script@v7
        with:
          script: |
            const issue = context.payload.issue;
            const title = issue.title.toLowerCase();
            const body = (issue.body || '').toLowerCase();
            const author = issue.user.login;
            const authorAssociation = issue.author_association;

            // Skip if author is a member, collaborator, or owner
            if (['MEMBER', 'COLLABORATOR', 'OWNER'].includes(authorAssociation)) {
              console.log(`Skipping spam check for ${authorAssociation}: ${author}`);
              return;
            }

            // Get user details via API to calculate account age
            let accountAgeDays = 365; // Default to old account if API fails
            try {
              const { data: userData } = await github.rest.users.getByUsername({
                username: author
              });
              const authorCreatedAt = new Date(userData.created_at);
              const now = new Date();
              accountAgeDays = (now - authorCreatedAt) / (1000 * 60 * 60 * 24);
              console.log(`Account ${author} created at ${userData.created_at}, age: ${accountAgeDays.toFixed(1)} days`);
            } catch (error) {
              console.log(`Failed to get user info for ${author}: ${error.message}`);
            }

            // Spam keywords - airlines and travel-related spam
            const spamKeywords = [
              // Airlines
              'lufthansa', 'emirates', 'klm', 'turkish airlines', 'singapore airlines',
              'aer lingus', 'sas airlines', 'qatar airways', 'british airways',
              'american airlines', 'united airlines', 'delta airlines', 'air france',
              'swiss air', 'austrian airlines', 'tap portugal', 'air canada',
              'air europa', 'ita airways',
              // Italian terms
              'telefono', 'rimborso', 'volo', 'biglietto', 'prenotazione',
              'annullare', 'cancellare', 'modifica', 'gestire', 'chiamare',
              'numero di telefono', 'contattare', 'assistenza clienti',
              // German terms
              'kontakt', 'buchen', 'kundenservice', 'hotline', 'kundendienst',
              'buchung', 'stornieren', 'umbuchung', 'erreichen', 'telefonnummer',
              // French terms
              'billet', 'réservation', 'annuler', 'rembours', 'vol',
              'contacter', 'numéro', 'téléphone', 'modifier', 'payer',
              // Common spam patterns
              'customer service number', 'booking number', 'flight cancel',
              'refund process', 'how to contact', 'toll free', 'helpline',
              '1-800', '1-888', '1-877', '1-866'
            ];

            // Check content for spam keywords
            const contentToCheck = title + ' ' + body;
            const matchedKeywords = spamKeywords.filter(kw => contentToCheck.includes(kw));

            // Check for phone number patterns (3+ phone numbers is suspicious)
            const phonePatterns = [
              /\+\d{1,3}[\s-]?\d{2,4}[\s-]?\d{3,4}[\s-]?\d{3,4}/g,  // International format
              /\d{3}[\s.-]?\d{3}[\s.-]?\d{4}/g                       // US/common format
            ];
            let phoneCount = 0;
            for (const pattern of phonePatterns) {
              const matches = contentToCheck.match(pattern) || [];
              phoneCount += matches.length;
            }
            const hasExcessivePhones = phoneCount >= 2;

            // Spam detection rules:
            // 1. Match 2+ spam keywords
            // 2. New account (< 7 days) + 1 spam keyword
            // 3. 2+ phone numbers in content
            const isSpam = matchedKeywords.length >= 2 ||
                          (accountAgeDays < 7 && matchedKeywords.length >= 1) ||
                          hasExcessivePhones;

            if (isSpam) {
              console.log(`Spam detected in issue #${issue.number}`);
              console.log(`Author: ${author}, Account age: ${accountAgeDays.toFixed(1)} days`);
              console.log(`Matched keywords: ${matchedKeywords.join(', ')}`);
              console.log(`Phone numbers found: ${phoneCount}`);

              // Add spam label
              await github.rest.issues.addLabels({
                owner: context.repo.owner,
                repo: context.repo.repo,
                issue_number: issue.number,
                labels: ['spam']
              });

              // Add comment
              await github.rest.issues.createComment({
                owner: context.repo.owner,
                repo: context.repo.repo,
                issue_number: issue.number,
                body: `This issue has been automatically detected as spam and will be closed.\n\n` +
                      `If this is a legitimate issue, please create a new issue using the [issue template](https://github.com/${context.repo.owner}/${context.repo.repo}/issues/new/choose).\n\n` +
                      `---\n` +
                      `此 Issue 被自动检测为垃圾信息，将被关闭。如果这是一个合法的问题，请使用 [Issue 模板](https://github.com/${context.repo.owner}/${context.repo.repo}/issues/new/choose) 重新创建。`
              });

              // Close issue
              await github.rest.issues.update({
                owner: context.repo.owner,
                repo: context.repo.repo,
                issue_number: issue.number,
                state: 'closed',
                state_reason: 'not_planned'
              });

              // Lock issue
              await github.rest.issues.lock({
                owner: context.repo.owner,
                repo: context.repo.repo,
                issue_number: issue.number,
                lock_reason: 'spam'
              });

              console.log(`Issue #${issue.number} closed and locked as spam`);
            } else {
              console.log(`No spam detected in issue #${issue.number}`);
              console.log(`Matched keywords: ${matchedKeywords.length}, Phone numbers: ${phoneCount}, Account age: ${accountAgeDays.toFixed(1)} days`);
            }