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


        @Override
    public void process(HttpRequest request, HttpContext context)throws HttpException, IOException {
            AuthState authState = (AuthState) context.getAttribute(ClientContext.TARGET_AUTH_STATE);
            if (authState != null && authState.getAuthScheme() == null) {
                AuthScheme scheme = new BasicSchemeFactory().newInstance(new BasicHttpParams());
                authState.setAuthScheme(scheme);
                authState.setCredentials(credentials);
            }
        }

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            CredentialsProvider credsProvider = (CredentialsProvider) context.getAttribute(
                    ClientContext.CREDS_PROVIDER);
            
            HttpHost target = (HttpHost) context.getAttribute(ExecutionContext.HTTP_TARGET_HOST);
            if (target != null) {
                AuthScheme authScheme = authCache.get(target);
                if (authScheme != null) {
                    doPreemptiveAuth(
                            target, 
                            authScheme,                     
                            (AuthState) context.getAttribute(ClientContext.TARGET_AUTH_STATE), 
                            credsProvider);
                }
            }


            HttpHost proxy = (HttpHost) context.getAttribute(ExecutionContext.HTTP_PROXY_HOST);
            if (proxy != null) {
                AuthScheme authScheme = authCache.get(proxy);
                if (authScheme != null) {
                    doPreemptiveAuth(
                            proxy, 
                            authScheme,                     
                            (AuthState) context.getAttribute(ClientContext.PROXY_AUTH_STATE),

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    private void cache(final AuthCache authCache, final HttpHost host, final AuthState authState) {
        if (authState == null) {
            return;
        }
        
        AuthScheme authScheme = authState.getAuthScheme();
        if (authScheme == null || !authScheme.isComplete()) {
            return;
        }
        
        String schemeName = authScheme.getSchemeName();
        if (!schemeName.equalsIgnoreCase(AuthPolicy.BASIC) && 
                !schemeName.equalsIgnoreCase(AuthPolicy.DIGEST)) {
            return;
        }

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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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                    if (this.log.isDebugEnabled()) {
                        this.log.debug("[exchange: " + state.getId() + "] Resetting target auth state");
                    }
                    targetAuthState.reset();
                    final AuthState proxyAuthState = localContext.getProxyAuthState();
                    final AuthScheme authScheme = proxyAuthState.getAuthScheme();
                    if (authScheme != null && authScheme.isConnectionBased()) {
                        if (this.log.isDebugEnabled()) {
                            this.log.debug("[exchange: " + state.getId() + "] Resetting proxy auth state");
                        }
                        proxyAuthState.reset();
                    }

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        if (this.log.isDebugEnabled()) {
            this.log.debug("Authentication schemes in the order of preference: " 
                + authPrefs);
        }


        AuthScheme authScheme = null;
        for (String id: authPrefs) {
            Header challenge = challenges.get(id.toLowerCase(Locale.ENGLISH)); 


            if (challenge != null) {
                if (this.log.isDebugEnabled()) {

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                    target.getSchemeName());
        }


        final AuthState targetState = clientContext.getTargetAuthState();
        if (target != null && targetState != null && targetState.getState() == AuthProtocolState.UNCHALLENGED) {
            final AuthScheme authScheme = authCache.get(target);
            if (authScheme != null) {
                doPreemptiveAuth(target, authScheme, targetState, credsProvider);
            }
        }


        final HttpHost proxy = route.getProxyHost();
        final AuthState proxyState = clientContext.getProxyAuthState();
        if (proxy != null && proxyState != null && proxyState.getState() == AuthProtocolState.UNCHALLENGED) {
            final AuthScheme authScheme = authCache.get(proxy);
            if (authScheme != null) {
                doPreemptiveAuth(proxy, authScheme, proxyState, credsProvider);
            }
        }
    }

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            if (challenges.isEmpty()) {
                this.log.debug("Response contains no authentication challenges");
                return false;
            }


            final AuthScheme authScheme = authState.getAuthScheme();
            switch (authState.getState()) {
            case FAILURE:
                return false;
            case SUCCESS:
                authState.reset();
                break;
            case CHALLENGED:
            case HANDSHAKE:
                if (authScheme == null) {
                    this.log.debug("Auth scheme is null");
                    authStrategy.authFailed(host, null, context);
                    authState.reset();
                    authState.setState(AuthProtocolState.FAILURE);
                    return false;
                }
            case UNCHALLENGED:
                if (authScheme != null) {
                    final String id = authScheme.getSchemeName();
                    final Header challenge = challenges.get(id.toLowerCase(Locale.US));
                    if (challenge != null) {
                        this.log.debug("Authorization challenge processed");
                        authScheme.processChallenge(challenge);
                        if (authScheme.isComplete()) {
                            this.log.debug("Authentication failed");
                            authStrategy.authFailed(host, authState.getAuthScheme(), context);
                            authState.reset();
                            authState.setState(AuthProtocolState.FAILURE);
                            return false;

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     */
    public void generateAuthResponse(
            final HttpRequest request,
            final AuthState authState,
            final HttpContext context) throws HttpException, IOException {
        AuthScheme authScheme = authState.getAuthScheme();
        Credentials creds = authState.getCredentials();
        switch (authState.getState()) {
        case FAILURE:
            return;
        case SUCCESS:
            ensureAuthScheme(authScheme);
            if (authScheme.isConnectionBased()) {
                return;
            }
            break;
        case CHALLENGED:
            final Queue<AuthOption> authOptions = authState.getAuthOptions();
            if (authOptions != null) {
                while (!authOptions.isEmpty()) {
                    final AuthOption authOption = authOptions.remove();
                    authScheme = authOption.getAuthScheme();
                    creds = authOption.getCredentials();
                    authState.update(authScheme, creds);
                    if (this.log.isDebugEnabled()) {
                        this.log.debug("Generating response to an authentication challenge using "
                                + authScheme.getSchemeName() + " scheme");
                    }
                    try {
                        final Header header = doAuth(authScheme, creds, request, context);
                        request.addHeader(header);
                        break;

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            // Reset auth states if redirecting to another host
            if (!route.getTargetHost().equals(newTarget)) {
                this.log.debug("Resetting target auth state");
                targetAuthState.reset();
                final AuthScheme authScheme = proxyAuthState.getAuthScheme();
                if (authScheme != null && authScheme.isConnectionBased()) {
                    this.log.debug("Resetting proxy auth state");
                    proxyAuthState.reset();
                }
            }

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