And you want to have a way for the frontend to authenticate with the backend, using a **username** and **password**.

We can use **OAuth2** to build that with **FastAPI**.

But let's save you the time of reading the full long specification just to find those little pieces of information you need.

Let's use the tools provided by **FastAPI** to handle security.

## How it looks { #how-it-looks }

        }

        try {
            // In real implementation, this would perform RDMA read into the buffer
            // For skeleton implementation, simulate reading the requested amount
            int bytesToRead = Math.min(length, buffer.remaining());

            // Simulate RDMA read operation

    /** The OpenSearch client. */
    protected final Client client;
    /** The suggest settings. */
    protected final SuggestSettings suggestSettings;
    /** The reading converter. */
    protected final ReadingConverter readingConverter;
    /** The contents reading converter. */
    protected final ReadingConverter contentsReadingConverter;
    /** The normalizer. */
    protected final Normalizer normalizer;
    /** The analyzer. */

		// Offset should always be aligned to b.shardSize
		// Can never happen unless there are programmer bugs
		return 0, errUnexpected
	}
	if b.rc == nil {
		// For the first ReadAt() call we need to open the stream for reading.
		b.currOffset = offset
		streamOffset := (offset/b.shardSize)*int64(b.h.Size()) + offset
		if len(b.data) == 0 && b.tillOffset != streamOffset {

     *
     * @param outputFile the converted output file
     * @param outExt the output file extension
     * @return the extracted text content
     * @throws ExtractException if an error occurs while reading the file
     */
    protected String getOutputContent(final File outputFile, final String outExt) {
        final Extractor extractor = getExtractor(outExt);
        if (extractor != null) {

    }

    /** If [e] is non-null, this will return a non-null value. */
    fun complete(e: IOException?): IOException? {
      if (completed) return e
      completed = true
      // If the body is closed without reading any bytes send a responseBodyStart() now.
      if (e == null && invokeStartEvent) {
        invokeStartEvent = false
        call.eventListener.responseBodyStart(call)
      }
      return bodyComplete(

    private static final Logger logger = LogManager.getLogger(ESSourceReader.class);

    /** Queue of documents. */
    protected final Queue<Map<String, Object>> queue = new ConcurrentLinkedQueue<>();
    /** Flag indicating if reading is finished. */
    protected final AtomicBoolean isFinished = new AtomicBoolean(false);

    /** OpenSearch client. */
    protected final Client client;
    /** Suggest settings. */

import java.io.IOException;
import java.io.InputStream;
import java.math.BigInteger;
import java.util.Date;

import jcifs.SmbConstants;
import jcifs.smb.SID;

/**
 * Input stream for reading PAC data structures with proper alignment and byte ordering.
 * Handles little-endian byte order and data alignment requirements of PAC structures.
 */
public class PacDataInputStream {

    private final DataInputStream dis;

	lastShardSize := ceilFrac(lastBlockSize, int64(e.dataBlocks))
	return numShards*e.ShardSize() + lastShardSize
}

// ShardFileOffset - returns the effective offset where erasure reading begins.
func (e *Erasure) ShardFileOffset(startOffset, length, totalLength int64) int64 {
	shardSize := e.ShardSize()
	shardFileSize := e.ShardFileSize(totalLength)
	endShard := (startOffset + length) / e.blockSize

		`
	var err error
	dir := t.TempDir()

	mountsPath := filepath.Join(dir, "mounts")
	if err = os.WriteFile(mountsPath, []byte(successCase), 0o666); err != nil {
		t.Fatal(err)
	}
	// Verifies if reading each line worked properly.
	{
		var mounts mountInfos
		mounts, err = readProcMounts(mountsPath)
		if err != nil {
			t.Fatal(err)
		}
		if len(mounts) != 3 {