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

                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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        return userPrincipal;
    }


    private static Principal getAuthPrincipal(final AuthState authState) {
        AuthScheme scheme = authState.getAuthScheme();
        if (scheme != null && scheme.isComplete() && scheme.isConnectionBased()) {
            Credentials creds = authState.getCredentials();
            if (creds != null) {
                return creds.getUserPrincipal(); 
            }
        }

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


        AuthScheme authScheme = null;
        for (int i = 0; i < authPrefs.size(); i++) {
            String id = (String) authPrefs.get(i);
            Header challenge = challenges.get(id.toLowerCase(Locale.ENGLISH)); 


            if (challenge != null) {

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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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            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 = wrapRequest(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.setAuthScope(authScope);
        authState.setCredentials(creds);
    }


    private void invalidateAuthIfSuccessful(final AuthState authState) {
        AuthScheme authscheme = authState.getAuthScheme();
        if (authscheme != null
                && authscheme.isConnectionBased()
                && authscheme.isComplete()
                && authState.getCredentials() != null) {
            authState.invalidate();
        }
    }

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