# OAuth2 with Password (and hashing), Bearer with JWT tokens

Now that we have all the security flow, let's make the application actually secure, using <abbr title="JSON Web Tokens">JWT</abbr> tokens and secure password hashing.

This code is something you can actually use in your application, save the password hashes in your database, etc.

We are going to start from where we left in the previous chapter and increment it.

## About JWT

package lex

import (
	"text/scanner"

	"cmd/internal/src"
)

// A Slice reads from a slice of Tokens.
type Slice struct {
	tokens []Token
	base   *src.PosBase
	line   int
	pos    int
}

func NewSlice(base *src.PosBase, line int, tokens []Token) *Slice {
	return &Slice{
		tokens: tokens,
		base:   base,
		line:   line,
		pos:    -1, // Next will advance to zero.
	}
}

		return nil, &ErrInvalidARN{s}
	}

	tokens := strings.Split(s, ":")
	if len(tokens) != 6 {
		return nil, &ErrInvalidARN{s}
	}

	if tokens[4] == "" || tokens[5] == "" {
		return nil, &ErrInvalidARN{s}
	}

	return &ARN{
		region: tokens[3],
		TargetID: TargetID{
			ID:   tokens[4],
			Name: tokens[5],
		},
	}, nil

	allowMACs := supportedMACs
	var err error

	for _, arg := range args {
		tokens := strings.SplitN(arg, "=", 2)
		if len(tokens) != 2 {
			logger.Fatal(fmt.Errorf("invalid arguments passed to --sftp=%s", arg), "unable to start SFTP server")
		}
		switch tokens[0] {
		case "address":
			host, portStr, err := net.SplitHostPort(tokens[1])
			if err != nil {

Previously, site replication required the root credentials of peer sites to be identical. This is no longer necessary because STS tokens are now signed with the site replicator service account credentials, thus allowing flexibility in the independent management of root accounts across sites and the ability to disable root accounts eventually.

	lex, err := sqlLexer.Lex(s)
	if err != nil {
		t.Fatal(err)
	}
	tokens, err := lexer.ConsumeAll(lex)
	if err != nil {
		t.Fatal(err)
	}
	// for i, t := range tokens {
	// 	fmt.Printf("%d: %#v\n", i, t)
	// }
	if len(tokens) != 7 {
		t.Fatalf("Expected 7 got %d", len(tokens))
	}
}

func TestSelectWhere(t *testing.T) {
	p := participle.MustBuild(
		&Select{},

/// tip

In the next chapter, you will see a real secure implementation, with password hashing and <abbr title="JSON Web Tokens">JWT</abbr> tokens.

But for now, let's focus on the specific details we need.

///

//// tab | Python 3.10+

```Python hl_lines="87"
{!> ../../docs_src/security/tutorial003_an_py310.py!}
```

////

//// tab | Python 3.9+

```Python hl_lines="87"

func doesPresignV2SignatureMatch(r *http.Request) APIErrorCode {
	// r.RequestURI will have raw encoded URI as sent by the client.
	tokens := strings.SplitN(r.RequestURI, "?", 2)
	encodedResource := tokens[0]
	encodedQuery := ""
	if len(tokens) == 2 {
		encodedQuery = tokens[1]
	}

	var (
		filteredQueries []string
		gotSignature    string
		expires         string
		accessKey       string

	if err != nil {
		if xnet.IsNetworkOrHostDown(err, false) {
			return false, errNotConnected
		}
		return false, err
	}
	tokens := strings.Fields(target.args.AuthToken)
	switch len(tokens) {
	case 2:
		req.Header.Set("Authorization", target.args.AuthToken)
	case 1:
		req.Header.Set("Authorization", "Bearer "+target.args.AuthToken)
	}

        }
        if (!rangeValue.closed) {
            return isLeft ? -1 : 1;
        }
        return 0;
    }

    private static void addZeroTokens(List<String> tokens, int max) {
        while (tokens.size() < max) {
            tokens.add("0");
        }
    }

    private static boolean isRange(String value) {
        return value.startsWith("[") || value.startsWith("(");
    }