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{* ../../docs_src/security/tutorial005_an_py310.py hl[106,108:116] *}

## Verify the `username` and data shape { #verify-the-username-and-data-shape }

We verify that we get a `username`, and extract the scopes.

* the data from the client to be sent through the network
* the data sent by your program to be received by the client through the network
* the contents of a file in the disk to be read by the system and given to your program
* the contents your program gave to the system to be written to disk
* a remote API operation

replication even before the two sites get fully synced.

In the case of multi destination replication, the replication status shows `COMPLETED` only after the replication operation succeeds on each of the targets specified in the replication configuration. If multiple targets are configured to use active-active replication and multi destination replication, the administrator should ensure that the replication features enabled (such as replica metadata sync, delete marker replication etc) are...

     * @param dst the destination buffer
     * @param dstIndex the starting offset in the buffer
     * @return the number of bytes written
     */
    protected abstract int writeBytesWireFormat(byte[] dst, int dstIndex);

    /**
     * Reads the parameter words portion of the SMB message from the wire format.
     *
     * @param buffer the buffer containing the message data

            "The client does not have the necessary access rights to perform the requested function.", "Access is denied.",
            "The TID specified was invalid.", "The handle is invalid.", "The network name cannot be found.",
            "Not enough storage is available to process this command.", "The media is write protected.", "The device is not ready.",

            "The client does not have the necessary access rights to perform the requested function.", "Access is denied.",
            "The TID specified was invalid.", "The handle is invalid.", "The network name cannot be found.",
            "Not enough storage is available to process this command.", "The media is write protected.", "The device is not ready.",

When you try to open the URL for the first time (or click the "Execute" button in the docs) the browser will ask you for your username and password:

<img src="/img/tutorial/security/image12.png">

## Check the username { #check-the-username }

Here's a more complete example.

Use a dependency to check if the username and password are correct.

	done         bool      // Scan has finished.
}

// SplitFunc is the signature of the split function used to tokenize the
// input. The arguments are an initial substring of the remaining unprocessed
// data and a flag, atEOF, that reports whether the [Reader] has no more data
// to give. The return values are the number of bytes to advance the input
// and the next token to return to the user, if any, plus an error, if any.
//

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *