Examples of org.apache.http.auth.AuthScheme

org.apache.http.auth.AuthScheme
This interface represents an abstract challenge-response oriented authentication scheme.

An authentication scheme should be able to support the following functions:
- Parse and process the challenge sent by the targer server in response to request for a protected resource
- Provide its textual designation
- Provide its parameters, if available
- Provide the realm this authentication scheme is applicable to, if available
- Generate authorization string for the given set of credentials, request method and URI as specificed in the HTTP request line in response to the actual authorization challenge
Authentication schemes may ignore method name and URI parameters if they are not relevant for the given authentication mechanism

Authentication schemes may be stateful involving a series of challenge-response exchanges
@author Oleg Kalnichevski @author Adrian Sutton @since 4.0

        Credentials cred = new UsernamePasswordCredentials("username","password");
        Credentials cred2 = new UsernamePasswordCredentials("uname2","password2");


        Header authChallenge = new BasicHeader(AUTH.WWW_AUTH, challenge1);
        HttpRequest request = new BasicHttpRequest("Simple", "/");
        AuthScheme authscheme = new DigestScheme();
        authscheme.processChallenge(authChallenge);
        Header authResponse = authscheme.authenticate(cred, request);


        Map<String, String> table = parseAuthResponse(authResponse);
        assertEquals("username", table.get("username"));
        assertEquals("realm1", table.get("realm"));
        assertEquals("/", table.get("uri"));
        assertEquals("abcde", table.get("nonce"));
        assertEquals("786f500303eac1478f3c2865e676ed68", table.get("response"));


        authChallenge = new BasicHeader(AUTH.WWW_AUTH, challenge2);
        AuthScheme authscheme2 = new DigestScheme();
        authscheme2.processChallenge(authChallenge);
        authResponse = authscheme2.authenticate(cred2, request);


        table = parseAuthResponse(authResponse);
        assertEquals("uname2", table.get("username"));
        assertEquals("realm2", table.get("realm"));
        assertEquals("/", table.get("uri"));

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        Header authChallenge = new BasicHeader(AUTH.WWW_AUTH, challenge);
        
        Credentials cred = new UsernamePasswordCredentials(username, password);
        HttpRequest request = new BasicHttpRequest("Simple", "/");


        AuthScheme authscheme = new DigestScheme();
        authscheme.processChallenge(authChallenge);
        Header authResponse = authscheme.authenticate(cred, request);
        String response = authResponse.getValue();
        
        assertTrue(response.indexOf("nc=00000001") > 0); // test for quotes
        assertTrue(response.indexOf("qop=auth") > 0); // test for quotes

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        Credentials cred = new UsernamePasswordCredentials(username, password);


        HttpRequest request = new BasicHttpRequest("Simple", "/");


        AuthScheme authscheme = new DigestScheme();
        authscheme.processChallenge(authChallenge);
        Header authResponse = authscheme.authenticate(cred, request);


        Map<String, String> table = parseAuthResponse(authResponse);
        assertEquals(username, table.get("username"));
        assertEquals(realm, table.get("realm"));
        assertEquals("MD5-sess", table.get("algorithm"));

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            + "qop=\"jakarta\""; // jakarta is an invalid qop value


        Header authChallenge = new BasicHeader(AUTH.WWW_AUTH, challenge);
        
        try {
            AuthScheme authscheme = new DigestScheme();
            authscheme.processChallenge(authChallenge);
            fail("MalformedChallengeException exception expected due to invalid qop value");
        } catch(MalformedChallengeException e) {
        }
    }

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    public void testDigestAuthenticationWithStaleNonce() throws Exception {
        String challenge = "Digest realm=\"realm1\", " +
                "nonce=\"f2a3f18799759d4f1a1c068b92b573cb\", stale=\"true\"";
        Header authChallenge = new BasicHeader(AUTH.WWW_AUTH, challenge);
        AuthScheme authscheme = new DigestScheme();
        authscheme.processChallenge(authChallenge);


        assertFalse(authscheme.isComplete());
    }

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                ClientContext.TARGET_AUTH_STATE);
        if (authState == null) {
            return;
        }


        AuthScheme authScheme = authState.getAuthScheme();
        if (authScheme == null) {
            return;
        }
        
        Credentials creds = authState.getCredentials();
        if (creds == null) {
            this.log.debug("User credentials not available");
            return;
        }


        if (authState.getAuthScope() != null || !authScheme.isConnectionBased()) {
            try {
                request.addHeader(authScheme.authenticate(creds, request));
            } catch (AuthenticationException ex) {
                if (this.log.isErrorEnabled()) {
                    this.log.error("Authentication error: " + ex.getMessage());
                }
            }

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                ClientContext.PROXY_AUTH_STATE);
        if (authState == null) {
            return;
        }


        AuthScheme authScheme = authState.getAuthScheme();
        if (authScheme == null) {
            return;
        }
        
        Credentials creds = authState.getCredentials();
        if (creds == null) {
            this.log.debug("User credentials not available");
            return;
        }
        if (authState.getAuthScope() != null || !authScheme.isConnectionBased()) {
            try {
                request.addHeader(authScheme.authenticate(creds, request));
            } catch (AuthenticationException ex) {
                if (this.log.isErrorEnabled()) {
                    this.log.error("Proxy authentication error: " + ex.getMessage());
                }
            }

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            final AuthenticationHandler authHandler,
            final HttpResponse response, 
            final HttpContext context) 
                throws MalformedChallengeException, AuthenticationException {
        
        AuthScheme authScheme = authState.getAuthScheme();
        if (authScheme == null) {
            // Authentication not attempted before
            authScheme = authHandler.selectScheme(challenges, response, context);
            authState.setAuthScheme(authScheme);
        }
        String id = authScheme.getSchemeName();


        Header challenge = challenges.get(id.toLowerCase(Locale.ENGLISH));
        if (challenge == null) {
            throw new AuthenticationException(id + 
                " authorization challenge expected, but not found");
        }
        authScheme.processChallenge(challenge);
        this.log.debug("Authorization challenge processed");
    }

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        if (port < 0) {
            Scheme scheme = connManager.getSchemeRegistry().getScheme(host);
            port = scheme.getDefaultPort();
        }
        
        AuthScheme authScheme = authState.getAuthScheme();
        AuthScope authScope = new AuthScope(
                hostname,
                port,
                authScheme.getRealm(), 
                authScheme.getSchemeName());  
        
        if (this.log.isDebugEnabled()) {
            this.log.debug("Authentication scope: " + authScope);
        }
        Credentials creds = authState.getCredentials();
        if (creds == null) {
            creds = credsProvider.getCredentials(authScope);
            if (this.log.isDebugEnabled()) {
                if (creds != null) {
                    this.log.debug("Found credentials");
                } else {
                    this.log.debug("Credentials not found");
                }
            }
        } else {
            if (authScheme.isComplete()) {
                this.log.debug("Authentication failed");
                creds = null;
            }
        }
        authState.setAuthScope(authScope);

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    public void testBasicAuthenticationWithNoRealm() {
        String challenge = "Basic";
        Header header = new BasicHeader(AUTH.WWW_AUTH, challenge);
        try {
            AuthScheme authscheme = new BasicScheme();
            authscheme.processChallenge(header);
            fail("Should have thrown MalformedChallengeException");
        } catch(MalformedChallengeException e) {
            // expected
        }
    }

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