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

            proxyAuthState.setAuthScope(null);
            
            // Invalidate auth states if redirecting to another host
            if (!route.getTargetHost().equals(newTarget)) {
                targetAuthState.invalidate();
                AuthScheme authScheme = proxyAuthState.getAuthScheme();
                if (authScheme != null && authScheme.isConnectionBased()) {
                    proxyAuthState.invalidate();
                }
            }


            RequestWrapper wrapper = new RequestWrapper(redirect);

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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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            AuthState authState = (AuthState) context.getAttribute(
                ClientContext.TARGET_AUTH_STATE );


            // If no auth scheme avaialble yet, try to initialize it preemptively
            if( authState.getAuthScheme() == null ) {
                AuthScheme authScheme = (AuthScheme) context.getAttribute(
                    "preemptive-auth" );
                CredentialsProvider credsProvider = (CredentialsProvider) context.getAttribute(
                    ClientContext.CREDS_PROVIDER );
                HttpHost targetHost = (HttpHost) context.getAttribute(
                    ExecutionContext.HTTP_TARGET_HOST );

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            AuthState authState = (AuthState) context.getAttribute( ClientContext.TARGET_AUTH_STATE );


            // If no auth scheme avaialble yet, try to initialize it preemptively
            if( authState.getAuthScheme() == null ) {
                AuthScheme authScheme = (AuthScheme) context.getAttribute( "preemptive-auth" );
                CredentialsProvider credsProvider = (CredentialsProvider) context.getAttribute( ClientContext.CREDS_PROVIDER );
//                HttpHost targetHost = (HttpHost) context.getAttribute( ExecutionContext.HTTP_TARGET_HOST );
                if( authScheme != null ) {
                    Credentials creds = credsProvider.getCredentials( AuthScope.ANY );
                    if( creds == null ) {

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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();
                AuthScheme authScheme = proxyAuthState.getAuthScheme();
                if (authScheme != null && authScheme.isConnectionBased()) {
                    this.log.debug("Resetting proxy auth state");
                    proxyAuthState.reset();
                }
            }

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        for (String id: authPrefs) {
            Header challenge = challenges.get(id.toLowerCase(Locale.US));
            if (challenge != null) {
                try {
                    AuthScheme authScheme = registry.getAuthScheme(id, response.getParams());
                    authScheme.processChallenge(challenge);


                    AuthScope authScope = new AuthScope(
                            authhost.getHostName(),
                            authhost.getPort(),
                            authScheme.getRealm(),
                            authScheme.getSchemeName());


                    Credentials credentials = credsProvider.getCredentials(authScope);
                    if (credentials != null) {
                        options.add(new AuthOption(authScheme, credentials));
                    }

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            }
        }
    }


    private boolean isCachable(final AuthState authState) {
        AuthScheme authScheme = authState.getAuthScheme();
        if (authScheme == null || !authScheme.isComplete()) {
            return false;
        }
        String schemeName = authScheme.getSchemeName();
        return schemeName.equalsIgnoreCase(AuthPolicy.BASIC) ||
                schemeName.equalsIgnoreCase(AuthPolicy.DIGEST);
    }

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        if (credsProvider == null) {
            this.log.debug("Credentials provider not set in the context");
            return options;
        }


        AuthScheme authScheme;
        try {
            authScheme = this.handler.selectScheme(challenges, response, context);
        } catch (AuthenticationException ex) {
            if (this.log.isWarnEnabled()) {
                this.log.warn(ex.getMessage(), ex);
            }
            return options;
        }
        String id = authScheme.getSchemeName();
        Header challenge = challenges.get(id.toLowerCase(Locale.US));
        authScheme.processChallenge(challenge);


        AuthScope authScope = new AuthScope(
                authhost.getHostName(),
                authhost.getPort(),
                authScheme.getRealm(),
                authScheme.getSchemeName());


        Credentials credentials = credsProvider.getCredentials(authScope);
        if (credentials != null) {
            options.add(new AuthOption(authScheme, credentials));
        }

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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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