E você quer uma maneira de o frontend autenticar o backend, usando um **username** e **senha**.

Nós podemos usar o **OAuth2** junto com o **FastAPI**.

Mas, vamos poupar-lhe o tempo de ler toda a especificação apenas para achar as pequenas informações que você precisa.

Vamos usar as ferramentas fornecidas pela **FastAPI** para lidar com segurança.

## Como Parece

    @Test
    @DisplayName("Test size calculation with short filename")
    void testSizeWithShortFilename() {
        FileRenameInformation2 info = new FileRenameInformation2("test.txt", false);
        // 20 bytes fixed + 2 * 8 chars = 20 + 16 = 36
        assertEquals(36, info.size());
    }

    @Test
    @DisplayName("Test size calculation with long filename")
    void testSizeWithLongFilename() {

        String text = "Test123 ABC-456";
        String field = "content";
        String lang = "en";

        List<AnalyzeToken> tokens = analyzer.analyzeAndReading(text, field, lang);

        assertNotNull(tokens);
        assertEquals(2, tokens.size()); // "Test123" and "ABC-456" (hyphen is not a split char in our tokenizer)

        final StringBuilder buf = new StringBuilder(100);
        boolean singleQuote = false;
        boolean doubleQuote = false;
        char prevChar = ' ';
        for (int i = 0; i < cmd.length(); i++) {
            final char c = cmd.charAt(i);
            if (c == ' ' && !singleQuote && !doubleQuote && buf.length() > 0) {
                cmdList.add(getCommandValue(buf.toString(), params));

                String server = authorityServerName;
                final int dot = server.indexOf('.');
                if (dot > 0 && !Character.isDigit(server.charAt(0))) {
                    server = server.substring(0, dot);
                }
                try (LsaPolicyHandle policyHandle = new LsaPolicyHandle(handle, "\\\\" + server, 0x00000800)) {

	rr := rand.New(rand.NewSource(1))
	rr.Shuffle(len(rs), func(i, j int) {
		rs[i], rs[j] = rs[j], rs[i]
	})
	uchars := string(rs)

	return func(b *testing.B, n int) {
		buf := bmbuf[0:n]
		o := copy(buf, uchars)
		for o < len(buf) {
			o += copy(buf[o:], uchars)
		}

		// Make space for the needle rune at the end of buf.
		m := utf8.RuneLen(needle)
		for o := m; o > 0; {

    String expected = "abcdabcd";

    // read the first 8 chars manually, since there's no equivalent to ByteSource.slice
    // TODO(cgdecker): Add CharSource.slice?
    StringBuilder builder = new StringBuilder();
    Reader reader = concatenated.openStream(); // no need to worry about closing
    for (int i = 0; i < 8; i++) {
      builder.append((char) reader.read());
    }
    assertEquals(expected, builder.toString());

      }
    }
  }

  @AndroidIncompatible // slow
  @GwtIncompatible // Doubles.tryParse
  public void testTryParseAllCodePoints() {
    // Exercise non-ASCII digit test cases and the like.
    char[] tmp = new char[2];
    for (int i = Character.MIN_CODE_POINT; i < Character.MAX_CODE_POINT; i++) {
      Character.toChars(i, tmp, 0);
      checkTryParse(String.copyValueOf(tmp, 0, Character.charCount(i)));
    }
  }

            passwordString = this.transportContext.getConfig().getGuestPassword();
        } else {
            char[] passwordChars = this.auth.getPasswordAsCharArray();
            if (passwordChars != null) {
                passwordString = new String(passwordChars);
                // Securely wipe the char array immediately after use
                java.util.Arrays.fill(passwordChars, '\0');
            }
        }

        if (matchWordFirst && !hiraganaQuery && singleWordQuery && text.contains(query)) {
            if (query.length() == 1) {
                return UnicodeBlock.of(query.charAt(0)) != UnicodeBlock.HIRAGANA;
            }
            return true;
        }
        return false;
    }

    /**
     * Checks if the query is a hiragana query.