index.js

const handlebars = require('handlebars');
const changelogHelper = require('./changelog');

module.exports = {
  ensurePr,
  checkAutoMerge,
};

// Ensures that PR exists with matching title/body
async function ensurePr(prConfig) {
  const config = { ...prConfig };

  logger.trace({ config }, 'ensurePr');
  // If there is a group, it will use the config of the first upgrade in the array
  const { branchName, prTitle, upgrades } = config;
  // Check if existing PR exists
  const existingPr = await platform.getBranchPr(branchName);
  if (existingPr) {
    logger.debug('Found existing PR');
  }
  config.upgrades = [];
  const branchStatus = await platform.getBranchStatus(
    branchName,
    config.requiredStatusChecks
  );

  if (config.lockFileErrors && config.lockFileErrors.length) {
    logger.debug('Forcing PR because of lock file errors');
    config.forcePr = true;
  }

  // Only create a PR if a branch automerge has failed
  if (
    config.automerge === true &&
    config.automergeType.startsWith('branch') &&
    !config.forcePr
  ) {
    logger.debug(
      `Branch is configured for branch automerge, branchStatus is: ${branchStatus}`
    );
    if (branchStatus === 'pending' || branchStatus === 'running') {
      logger.debug('Checking how long this branch has been pending');
      const lastCommitTime = await platform.getBranchLastCommitTime(branchName);
      const currentTime = new Date();
      const millisecondsPerHour = 1000 * 60 * 60;
      const elapsedHours = Math.round(
        (currentTime.getTime() - lastCommitTime.getTime()) / millisecondsPerHour
      );
      if (elapsedHours >= config.prNotPendingHours) {
        logger.info('Branch exceeds prNotPending hours - forcing PR creation');
        config.forcePr = true;
      }
    }
    if (config.forcePr || branchStatus === 'failure') {
      logger.debug(`Branch tests failed, so will create PR`);
    } else {
      return null;
    }
  }
  if (config.prCreation === 'status-success') {
    logger.debug('Checking branch combined status');
    if (branchStatus !== 'success') {
      logger.debug(`Branch status is "${branchStatus}" - not creating PR`);
      return null;
    }
    logger.debug('Branch status success');
  } else if (
    config.prCreation === 'not-pending' &&
    !existingPr &&
    !config.forcePr
  ) {
    logger.debug('Checking branch combined status');
    if (branchStatus === 'pending' || branchStatus === 'running') {
      logger.debug(`Branch status is "${branchStatus}" - checking timeout`);
      const lastCommitTime = await platform.getBranchLastCommitTime(branchName);
      const currentTime = new Date();
      const millisecondsPerHour = 1000 * 60 * 60;
      const elapsedHours = Math.round(
        (currentTime.getTime() - lastCommitTime.getTime()) / millisecondsPerHour
      );
      if (elapsedHours < config.prNotPendingHours) {
        logger.debug(
          `Branch is ${elapsedHours} hours old - skipping PR creation`
        );
        return null;
      }
      logger.debug(
        `prNotPendingHours=${
          config.prNotPendingHours
        } threshold hit - creating PR`
      );
    }
    logger.debug('Branch status success');
  }

  const processedUpgrades = [];

  const issueRe = /([\s(])#(\d+)([)\s]?)/g;

  const commitRepos = [];

  // Get changelog and then generate template strings
  for (const upgrade of upgrades) {
    const upgradeKey = `${upgrade.depName}-${upgrade.manager}-${
      upgrade.fromVersion
    }-${upgrade.toVersion}`;
    if (processedUpgrades.includes(upgradeKey)) {
      continue; // eslint-disable-line no-continue
    }
    processedUpgrades.push(upgradeKey);
    upgrade.hasUrls = !!(upgrade.repositoryUrl || upgrade.homepage);

    const logJSON = await changelogHelper.getChangeLogJSON({
      manager: upgrade.manager,
      versionScheme: upgrade.versionScheme,
      depType: upgrade.depType,
      depName: upgrade.depName,
      fromVersion: upgrade.fromVersion,
      toVersion: upgrade.toVersion,
      repositoryUrl: upgrade.repositoryUrl,
      releases: upgrade.releases,
    });

    if (logJSON) {
      upgrade.githubName = logJSON.project ? logJSON.project.github : undefined;
      upgrade.hasReleaseNotes = logJSON.hasReleaseNotes;
      upgrade.releases = [];
      if (upgrade.githubName && !commitRepos.includes(upgrade.githubName)) {
        commitRepos.push(upgrade.githubName);
        logJSON.versions.forEach(version => {
          const release = { ...version };
          // TODO: remove once hasCommits is deprecated
          release.commits = [];
          release.hasCommits = false;
          upgrade.hasCommits = upgrade.hasCommits || release.hasCommits;
          upgrade.releases.push(release);
        });
      }
    }
    config.upgrades.push(upgrade);
  }

  // Update the config object
  Object.assign(config, upgrades[0]);
  if (config.errors && config.errors.length) {
    config.hasErrors = true;
  }
  if (config.warnings && config.warnings.length) {
    config.hasWarnings = true;
  }
  config.hasReleaseNotes = config.upgrades.some(upg => upg.hasReleaseNotes);
  config.hasCommits = config.upgrades.some(upg => upg.hasCommits);

  const releaseNoteRepos = [];
  for (const upgrade of config.upgrades) {
    if (releaseNoteRepos.includes(upgrade.repositoryUrl)) {
      logger.debug(
        { depName: upgrade.depName },
        'Removing duplicate release notes'
      );
      upgrade.hasReleaseNotes = false;
    } else {
      releaseNoteRepos.push(upgrade.repositoryUrl);
    }
  }

  let prBody = handlebars.compile(config.prBody)(config);
  // istanbul ignore if
  if (config.global) {
    if (config.global.prBanner) {
      prBody = config.global.prBanner + '\n\n' + prBody;
    }
    if (config.global.prFooter) {
      prBody = prBody + '\n---\n\n' + config.global.prFooter;
    }
  }
  prBody = prBody.trim();

  // Clean up double v's
  prBody = prBody.replace(/\bvv(\d)/g, 'v$1');

  // Generic replacements/link-breakers

  // Put a zero width space after every # followed by a digit
  prBody = prBody.replace(/#(\d)/gi, '#&#8203;$1');
  // Put a zero width space after every @ symbol to prevent unintended hyperlinking
  prBody = prBody.replace(/@/g, '@&#8203;');
  prBody = prBody.replace(/(`\[?@)&#8203;/g, '$1');
  prBody = prBody.replace(/([a-z]@)&#8203;/gi, '$1');
  prBody = prBody.replace(issueRe, '$1#&#8203;$2$3');
  // convert escaped backticks back to `
  const backTickRe = /&#x60;([^/]*?)&#x60;/g;
  prBody = prBody.replace(backTickRe, '`$1`');
  prBody = prBody.replace(/`#&#8203;(\d+)`/g, '`#$1`');

  prBody = platform.getPrBody(prBody);

  try {
    if (existingPr) {
      logger.debug('Processing existing PR');
      if (config.automerge && branchStatus === 'failure') {
        logger.debug(`Setting assignees and reviewers as status checks failed`);
        await addAssigneesReviewers(config, existingPr);
      }
      // Check if existing PR needs updating
      const reviewableIndex = existingPr.body.indexOf(
        '<!-- Reviewable:start -->'
      );
      let existingPrBody = existingPr.body;
      if (reviewableIndex > -1) {
        logger.debug('Stripping Reviewable content');
        existingPrBody = existingPrBody.slice(0, reviewableIndex);
      }
      existingPrBody = existingPrBody.trim();
      if (existingPr.title === prTitle && existingPrBody === prBody) {
        logger.info(`${existingPr.displayNumber} does not need updating`);
        return existingPr;
      }
      // PR must need updating
      if (existingPr.title !== prTitle) {
        logger.info(
          {
            branchName,
            oldPrTitle: existingPr.title,
            newPrTitle: prTitle,
          },
          'PR title changed'
        );
      } else {
        logger.debug(
          {
            prTitle,
            oldPrBody: existingPr.body,
            newPrBody: prBody,
          },
          'PR body changed'
        );
      }

      await platform.updatePr(existingPr.number, prTitle, prBody);
      logger.info({ pr: existingPr.number }, `PR updated`);
      return existingPr;
    }
    logger.debug({ branchName, prTitle }, `Creating PR`);
    // istanbul ignore if
    if (config.updateType === 'rollback') {
      logger.warn('Creating Rollback PR');
    }
    let pr;
    try {
      pr = await platform.createPr(
        branchName,
        prTitle,
        prBody,
        config.labels,
        false,
        config.statusCheckVerify
      );
      logger.info({ branchName, pr: pr.number }, 'PR created');
    } catch (err) {
      logger.warn(
        {
          err,
          message: err.message,
          body: err.response ? err.response.body : undefined,
        },
        `Failed to create PR`
      );
      if (err.message === 'Validation Failed (422)') {
        logger.info({ branchName }, 'Deleting invalid branch');
        await platform.deleteBranch(branchName);
      }
      // istanbul ignore if
      if (err.statusCode === 502) {
        logger.info({ branchName }, 'Deleting branch due to server error');
        await platform.deleteBranch(branchName);
      }
      return null;
    }
    if (config.branchAutomergeFailureMessage) {
      const subject = 'Branch automerge failure';
      let content =
        'This PR was configured for branch automerge, however this is not possible so it has been raised as a PR instead.';
      if (config.branchAutomergeFailureMessage === 'branch status error') {
        content += '\n___\n * Branch has one or more failed status checks';
      }
      logger.info('Adding branch automerge failure message to PR');
      platform.ensureComment(pr.number, subject, content);
    }
    // Skip assign and review if automerging PR
    if (config.automerge && branchStatus !== 'failure') {
      logger.debug(
        `Skipping assignees and reviewers as automerge=${config.automerge}`
      );
    } else {
      await addAssigneesReviewers(config, pr);
    }
    logger.info(`Created ${pr.displayNumber}`);
    return pr;
  } catch (err) {
    // istanbul ignore if
    if (
      err.message === 'rate-limit-exceeded' ||
      err.message === 'platform-failure'
    ) {
      logger.debug('Passing error up');
      throw err;
    }
    logger.error({ err }, 'Failed to ensure PR:', err);
  }
  return null;
}

async function addAssigneesReviewers(config, pr) {
  if (config.assignees.length > 0) {
    try {
      const assignees = config.assignees.map(
        assignee =>
          assignee.length && assignee[0] === '@' ? assignee.slice(1) : assignee
      );
      await platform.addAssignees(pr.number, assignees);
      logger.info({ assignees: config.assignees }, 'Added assignees');
    } catch (err) {
      logger.info(
        { assignees: config.assignees, err },
        'Failed to add assignees'
      );
    }
  }
  if (config.reviewers.length > 0) {
    try {
      const reviewers = config.reviewers.map(
        reviewer =>
          reviewer.length && reviewer[0] === '@' ? reviewer.slice(1) : reviewer
      );
      await platform.addReviewers(pr.number, reviewers);
      logger.info({ reviewers: config.reviewers }, 'Added reviewers');
    } catch (err) {
      logger.info(
        { assignees: config.assignees, err },
        'Failed to add reviewers'
      );
    }
  }
}

async function checkAutoMerge(pr, config) {
  logger.trace({ config }, 'checkAutoMerge');
  const {
    branchName,
    automerge,
    automergeType,
    automergeComment,
    requiredStatusChecks,
  } = config;
  logger.debug(
    { automerge, automergeType, automergeComment },
    `Checking #${pr.number} for automerge`
  );
  if (automerge) {
    logger.info('PR is configured for automerge');
    // Return if PR not ready for automerge
    if (pr.isUnmergeable) {
      logger.info('PR is not mergeable');
      logger.debug({ pr });
      return false;
    }
    if (requiredStatusChecks && pr.canMerge !== true) {
      logger.info('PR is not ready for merge');
      return false;
    }
    // Check branch status
    const branchStatus = await platform.getBranchStatus(
      pr.branchName,
      requiredStatusChecks
    );
    logger.debug(`branchStatus=${branchStatus}`);
    if (branchStatus !== 'success') {
      logger.info('Branch status is not "success"');
      return false;
    }
    // Check if it's been touched
    if (!pr.canRebase) {
      logger.info('PR is ready for automerge but has been modified');
      return false;
    }
    if (automergeType === 'pr-comment') {
      logger.info(`Applying automerge comment: ${automergeComment}`);
      return platform.ensureComment(pr.number, null, automergeComment);
    }
    // Let's merge this
    logger.debug(`Automerging #${pr.number}`);
    const res = platform.mergePr(pr.number, branchName);
    logger.info({ pr: pr.number }, 'PR automerged');
    return res;
  }
  logger.debug('No automerge');
  return false;
}