# Simple OAuth2 with Password and Bearer { #simple-oauth2-with-password-and-bearer }

Now let's build from the previous chapter and add the missing parts to have a complete security flow.

## Get the `username` and `password` { #get-the-username-and-password }

We are going to use **FastAPI** security utilities to get the `username` and `password`.

	HandlerGetBandwidth
	HandlerWriteAll
	HandlerListBuckets
	HandlerRenameDataInline
	HandlerRenameData2
	HandlerCheckParts2
	HandlerRenamePart
	HandlerClearUploadID
	HandlerCheckParts3

	// Add more above here ^^^
	// If all handlers are used, the type of Handler can be changed.
	// Handlers have no versioning, so non-compatible handler changes must result in new IDs.
	handlerTest
	handlerTest2
	handlerLast

    }
  }

  @AndroidIncompatible // slow
  public void testCheckedAdd() {
    for (long a : ALL_LONG_CANDIDATES) {
      for (long b : ALL_LONG_CANDIDATES) {
        BigInteger expectedResult = valueOf(a).add(valueOf(b));
        boolean expectedSuccess = fitsInLong(expectedResult);
        try {
          assertEquals(a + b, LongMath.checkedAdd(a, b));
          assertTrue(expectedSuccess);

	resource := pathJoin(volume, path)

	n.lockMapMutex.Lock()
	nsLk, found := n.lockMap[resource]
	if !found {
		nsLk = &nsLock{
			LRWMutex: lsync.NewLRWMutex(),
		}
		// Add a count to indicate that a parallel unlock doesn't clear this entry.
	}
	nsLk.ref++
	n.lockMap[resource] = nsLk
	n.lockMapMutex.Unlock()

	// Locking here will block (until timeout).
	if readLock {

#    the TF MacOS package from Linux.
#      Ex. linux_x86        -- x86_64 Linux platform
#      Ex. linux_x86_cuda   -- x86_64 Linux platform, with Nvidia CUDA support
#      Ex. macos_arm64      -- arm64 MacOS platform
# 3. Add modifiers. Some modifiers for local execution are:
#      Ex. disk_cache -- Use a local cache
#      Ex. public_cache -- Use TF's public cache (read-only)

          }
          i++;
          buffer |= codePointToFourUtf8Bytes(codePoint) << shift;
          if (supplementaryPlaneFix) { // bug compatibility: earlier versions did not have this add
            shift += 32;
          }
          len += 4;
        }

        if (shift >= 32) {
          int k1 = mixK1((int) buffer);
          h1 = mixH1(h1, k1);
          buffer = buffer >>> 32;

	// For hardrives it is possible to set this to a lower value to avoid any
	// spike in latency. But currently we are simply keeping it optimal for SSDs.

	// bigFileThreshold is the point where we add readahead to put operations.
	bigFileThreshold = 128 * humanize.MiByte

	// XL metadata file carries per object metadata.
	xlStorageFormatFile = "xl.meta"

b.com/minio/minio/blob/master/docs/bucket/lifecycle/README.md).  If you have an object expiration lifecycle policy in your non-versioned bucket and you want to maintain the same permanent delete behavior when on versioning-enabled bucket, you must add a noncurrent expiration policy. The noncurrent expiration lifecycle policy will manage the deletes of the noncurrent object versions in the versioning-enabled bucket. (A version-enabled bucket maintains one current and zero or more noncurrent object...

            }
            return;
        }

        if (logger.isInfoEnabled()) {
            logger.info("Checking URL: {}", robotTxtUrl);
        }
        // add url to a set
        crawlerContext.getRobotsTxtUrlSet().add(robotTxtUrl);

        final HttpGet httpGet = new HttpGet(robotTxtUrl);

        // request header
        for (final Header header : requestHeaderList) {

                parentIds.add(currentData.getId());
                // Reset - only needed for 'getId'.
                currentData.setGroupId(null);
                currentData.setArtifactId(null);
                currentData.setVersion(null);
                currentData = parentData;
            } else if (!parentIds.add(parentData.getId())) {