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    * Redistributions of source code must retain the above copyright
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contributors may be used to endorse or promote products derived from
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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,           
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*/

package com.google.refine.oauth;

import oauth.signpost.OAuthConsumer;
import oauth.signpost.OAuthProvider;
import oauth.signpost.commonshttp.CommonsHttpOAuthConsumer;
import oauth.signpost.commonshttp.CommonsHttpOAuthProvider;

public abstract class Provider {

    protected String host;
    protected OAuthProvider oauthProvider;
    
    public Provider() {
    }

    public Provider(String host) {
        this.host = host;
    }
    
    public String getHost() {
        return host;
    }

    public String getRealm() {
        return "http://" + host + "/";
    }
    
    abstract public String getRequestTokenServiceURL();
    abstract public String getAccessTokenServiceURL();
    abstract public String getUserAuthorizationURL();
    
    public OAuthConsumer createConsumer(String consumerKey, String consumerSecret) {
        return new CommonsHttpOAuthConsumer(consumerKey, consumerSecret);
    }
    
    public synchronized OAuthProvider getProvider() {
        if (oauthProvider == null) {
            oauthProvider = new CommonsHttpOAuthProvider(
                    getRequestTokenServiceURL(), getAccessTokenServiceURL(), getUserAuthorizationURL());
        }
        return oauthProvider;
    }
}