const addRule = function()

in parseRuleData.ts [118:187]
46 lines of code
12 McCabe index (conditional complexity)

  const addRule = function (buffer) {
    const ruleContent = toml.parse(buffer);
  
    // Check if ruleContent.rule and ruleContent.hunt exist
    const ruleId = ruleContent.rule?.rule_id || ruleContent.hunt?.uuid;
    if (!ruleId) {
      throw new Error('Neither rule_id nor hunt.uuid is available');
    }
  
    // Initialize ruleContent.rule and ruleContent.metadata if they are undefined
    ruleContent.rule = ruleContent.rule || {};
    ruleContent.metadata = ruleContent.metadata || {};
  
    // Helper function to set default values if they do not exist
    const setDefault = (obj, key, defaultValue) => {
      if (!obj[key]) {
        obj[key] = defaultValue;
      }
    };
  
    // Use default tags if ruleContent.rule.tags does not exist
    const tags = ruleContent.rule.tags || ["Hunt Type: Hunt"];
    setDefault(ruleContent.rule, 'tags', ["Hunt Type: Hunt"]);

    // Add a tag based on the language
    const language = ruleContent.rule?.language;
    if (language) {
      tags.push(`Language: ${language}`);
    }

    // Add creation_date and updated_date if they do not exist
    const defaultDate = new Date(0).toISOString();
    setDefault(ruleContent.metadata, 'creation_date', defaultDate);
    setDefault(ruleContent.metadata, 'updated_date', defaultDate);
  
    // Use current date as default updated_date if it does not exist
    const updatedDate = new Date(ruleContent.metadata.updated_date.replace(/\//g, '-'));
  
    // Use hunt.name if rule.name does not exist
    const ruleName = ruleContent.rule.name || ruleContent.hunt.name || 'Unknown Rule';
  
    // Set other default values if they do not exist
    setDefault(ruleContent.metadata, 'integration', ruleContent.hunt?.integration);
    setDefault(ruleContent.rule, 'query', ruleContent.hunt?.query);
    setDefault(ruleContent.rule, 'license', "Elastic License v2");
    setDefault(ruleContent.rule, 'description', ruleContent.hunt?.description);

    // Convert hunt.mitre to rule.threat if hunt.mitre exists
    if (ruleContent.hunt?.mitre) {
      ruleContent.rule.threat = convertHuntMitre(ruleContent.hunt.mitre);
    }
  
    ruleSummaries.push({
      id: ruleId,
      name: ruleName,
      tags: tags,
      updated_date: updatedDate,
    });
  
    for (const t of tags) {
      addTagSummary(t, tagSummaries);
    }
  
    fs.writeFileSync(
      `${RULES_OUTPUT_PATH}${ruleId}.json`,
      JSON.stringify(ruleContent)
    );
  
    count++;
  };