@ammar-ahmed/automation-app-bot/lib/interceptors/checkReRun.js

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const Interceptor = require('./interceptor')
const MetaData = require('../metaData')
const Logger = require('../logger')

/**
 * Checks the event for a re-requested check_run. This GH event is triggered when the user
 * clicks on "Re-run" or "Re-run failed checks" in the UI and expects conditions to be re-validated. Fetch the PR and it's stored condition from
 * the check run text.
 *
 * Set the context up with the appropriate PR payload, event and action for a validation and check run.
 *
 * NOTE: "Re-run all checks" generates a different event and is not taken care of in this interceptor.
 */
class CheckReRun extends Interceptor {
  async process (context) {
    if (!(context.eventName === 'check_run' && context.payload.action === 'rerequested')) return context

    const checkRun = context.payload.check_run
    // some checkRun doesn't have output field, skip if output field is not present
    if (!checkRun || !checkRun.output) return context

    const meta = MetaData.deserialize(checkRun.output.text)
    if (this.possibleInjection(context, checkRun, meta)) return context

    // sometimes the checkRun.pull_requests is empty, in those cases, just skip
    if (checkRun.pull_requests.length === 0) return context

    const pr = await context.octokit.pulls.get(context.repo({ pull_number: checkRun.pull_requests[0].number }))
    context.payload.action = meta.action
    context.eventName = meta.eventName
    context.payload.pull_request = pr.data
    return context
  }

  possibleInjection (context, checkRun, meta) {
    const isInjection = checkRun.id !== meta.id
    if (isInjection) {
      const log = Logger.create('interceptors/checkReRun')
      log.warn({
        logType: Logger.logTypes.POTENTIAL_INJECTION,
        message: 'ids in payload do not match. Potential injection.',
        checkRun,
        meta
      })
    }
    return isInjection
  }
}

module.exports = CheckReRun