But first, let's check some small concepts.

## In a hurry? { #in-a-hurry }

If you don't care about any of these terms and you just need to add security with authentication based on username and password *right now*, skip to the next chapters.

## OAuth2 { #oauth2 }

OAuth2 is a specification that defines several ways to handle authentication and authorization.

It is quite an extensive specification and covers several complex use cases.

				// Determine if os.NotExist error is because of
				// baseDir's parent being present, retry it once such
				// that the MkdirAll is retried once for the parent
				// of dirPath.
				// Because it is worth a retry to skip a different
				// baseDir which is slightly higher up the depth.
				nbaseDir := path.Dir(baseDir)
				if baseDir != "" && nbaseDir != "" && nbaseDir != SlashSeparator {
					baseDir = nbaseDir
				}
				continue

			}

			for k, v := range userAccounts {
				if k == siteReplicatorSvcAcc {
					// skip the site replicate svc account as it is
					// already replicated.
					continue
				}

				if v.Credentials.ParentUser != "" && v.Credentials.ParentUser == globalActiveCred.AccessKey {
					// skip all root user service accounts.
					continue
				}

				info.UserInfoMap[k] = madmin.UserInfo{

	newMeta.Version = poolMetaVersion
	for idx, pool := range z.serverPools {
		var skip bool
		for _, currentPool := range prevMeta.Pools {
			// Preserve any current pool status.
			if currentPool.CmdLine == pool.endpoints.CmdLine {
				newMeta.Pools = append(newMeta.Pools, currentPool)
				skip = true
				break
			}
		}
		if skip {
			continue
		}
		newMeta.Pools = append(newMeta.Pools, PoolStatus{

                try {
                  startUp();
                  notifyStarted();
                  // If stopAsync() is called while starting we may be in the STOPPING state in
                  // which case we should skip right down to shutdown.
                  if (isRunning()) {
                    try {
                      AbstractExecutionThreadService.this.run();
                    } catch (Throwable t) {

            CollectionFeature.ALLOWS_NULL_VALUES,
            CollectionFeature.KNOWN_ORDER,
            CollectionFeature.RESTRICTS_ELEMENTS,
            CollectionSize.ANY)
        // don't skip collection tests since checkedQueue() is not tested by TestsForListsInJavaUtil
        .suppressing(suppressForCheckedQueue())
        .createTestSuite();
  }

  public Test testsForArrayDeque() {

	if err != nil {
		log.Fatalln(err)
	}

	secure := strings.EqualFold(u.Scheme, "https")
	transport, err := minio.DefaultTransport(secure)
	if err != nil {
		log.Fatalln(err)
	}
	if insecure {
		// skip TLS verification
		transport.TLSClientConfig.InsecureSkipVerify = true
	}

	s3Client, err := minio.New(u.Host, &minio.Options{
		Creds:     credentials.NewStaticV4(accessKey, secretKey, ""),
		Secure:    secure,

                try {
                  startUp();
                  notifyStarted();
                  // If stopAsync() is called while starting we may be in the STOPPING state in
                  // which case we should skip right down to shutdown.
                  if (isRunning()) {
                    try {
                      AbstractExecutionThreadService.this.run();
                    } catch (Throwable t) {

        ']'.code,
        '{'.code,
        '}'.code,
        '|'.code,
        '^'.code,
        '\''.code,
        ';'.code,
        '='.code,
        '@'.code,
      ).override(
        Encoding.SKIP,
        ':'.code,
        '/'.code,
        '\\'.code,
        '?'.code,
        '#'.code,
      ).test(UrlComponentEncodingTester.Component.USER)
  }

  @Test
  fun passwordCharacters() {

		return mtime1.After(mtime2)
	})

	defPool := PoolObjInfo{Index: -1}
	for _, pinfo := range poolObjInfos {
		// skip all objects from suspended pools if asked by the
		// caller.
		if opts.SkipDecommissioned && z.IsSuspended(pinfo.Index) {
			continue
		}
		// Skip object if it's from pools participating in a rebalance operation.
		if opts.SkipRebalancing && z.IsPoolRebalancing(pinfo.Index) {
			continue