com.macrossx.wechat.impl.WechatHelper.java Source code

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Here is the source code for com.macrossx.wechat.impl.WechatHelper.java

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/**
 * Copyright (C) 2016 X-Forever.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.macrossx.wechat.impl;

import java.net.URI;
import java.net.URISyntaxException;
import java.text.MessageFormat;
import java.util.Optional;

import javax.inject.Inject;
import javax.inject.Named;

import org.apache.http.client.methods.HttpGet;

import com.macrossx.wechat.IWechatHelper;
import com.macrossx.wechat.WechatConstants;
import com.macrossx.wechat.entity.WechatAccessToken;
import com.macrossx.wechat.http.WechatHttpClient;

import lombok.extern.java.Log;

@Log
public class WechatHelper implements IWechatHelper {
    @Inject
    @Named("macrossx.wechat.appid")
    private String appid;
    @Inject
    @Named("macrossx.wechat.appsecret")
    private String appsecret;

    private static WechatAccessToken _access_token;
    private static long _token_time = -1;

    /**
     * {@code _token_time}<tokentoken(7200-60)
     */
    public Optional<WechatAccessToken> getAccessToken() {
        try {
            if (System.currentTimeMillis() < _token_time) {
                return Optional.of(_access_token);
            }
            long current = System.currentTimeMillis();
            HttpGet httpGet = new HttpGet();
            httpGet.setURI(new URI(MessageFormat.format(WechatConstants.ACCESS_TOKEN_URL, appid, appsecret)));
            return new WechatHttpClient().send(httpGet, WechatAccessToken.class).map((e) -> {
                _access_token = e;
                _token_time = current + _access_token.getExpires_in() - 60;
                return _access_token;
            });
        } catch (URISyntaxException e) {
            log.info(e.getMessage());
            return Optional.empty();
        }

    }

}