//
// OauthViewController.m
// 20_帥哥no微博
//
// Created by beyond on 14-8-5.
// Copyright (c) 2014年 com.beyond. All rights reserved.
// 授權(quán)控制器,僅運行一次,取得了當(dāng)前用戶的access_token和uid之后,存檔,切換窗口的主控制器

#import "OauthViewController.h"

@interface OauthViewController ()<UIWebViewDelegate>
{
  // 成員變量記住,不同方法中要用到
  UIWebView *_webView;
}
@end

@implementation OauthViewController


-(void)loadView
{
  // 直接讓W(xué)ebView成為控制器的view,避免再次添加
  _webView = [[UIWebView alloc]init];
  self.view = _webView;

}


- (void)viewDidLoad
{
  [super viewDidLoad];
  
  // 設(shè)置代理為當(dāng)前控制器,以便監(jiān)聽webView的開始加載 和結(jié)束 加載
  _webView.delegate = self;
  
  // 申請認(rèn)證的地址
  NSString *oauthURL = [NSString stringWithFormat:@"https://api.weibo.com/oauth2/authorize?client_id=%@&response_type=code&redirect_uri=%@",kAppKey,kRedirectURL];
  
  // 調(diào)用分類的方法,加載申請認(rèn)證的網(wǎng)址
  [_webView loadURLString:oauthURL];
}

#pragma mark - 代理 方法
// 開始加載
- (void)webViewDidStartLoad:(UIWebView *)webView
{

  log(@"真的開始加載--%@",webView.request.URL);
  // 一開始加載就,顯示進(jìn)度條
  MBProgressHUD *hud = [MBProgressHUD showHUDAddedTo:webView animated:YES];
  hud.labelText = @"頁面加載中...";
}

// 是否開始加載某個頁面
- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType
{
  log(@"能否加載--%@",webView.request.URL);
  return YES;
}

// 頁面加載完成
- (void)webViewDidFinishLoad:(UIWebView *)webView
{
  log(@"加載完畢--%@",webView.request.URL);
  // 一旦加載完畢,就隱藏進(jìn)度條
  [MBProgressHUD hideAllHUDsForView:webView animated:YES];

  
  

  // 用戶同意授權(quán)之后,返回的URL包含授權(quán)的request_code,形如: http://www.abc.com/?code=888888888888
  // 返回了用戶授權(quán)的request_code的頁面之后,需要截取code,然后繼續(xù)拼接url,發(fā)起第3次請求(這次必須以POST方式),最終返回需要的access_token
  
  NSString *reDirectURLContainsCode = _webView.request.URL.absoluteString;
  // 分類方法,從左邊標(biāo)記字串的最后面開始,截取剩下的字符串
  NSString *code = [reDirectURLContainsCode subStrFromLeftFlagStr:@"?code="];
  //如果 不是返回code的url,不做任何事情
  if (code == nil) return;
  
  // 現(xiàn)在準(zhǔn)備發(fā)起最后一次請求,拼接第3次請求的需要的URL,本次請求返回的東東,才會是最重要的用戶的accessToken,也包含了用戶的uid
  NSString *accessTokenRequestURLStr = [NSString stringWithFormat:@"https://api.weibo.com/oauth2/access_token?client_id=%@&client_secret=%@&grant_type=authorization_code&redirect_uri=%@&code=%@",kAppKey,kAppSecret,kRedirectURL,code];

  
  
  // 1,創(chuàng)建URL
  NSURL *accessTokenRequestURL = [NSURL URLWithString:accessTokenRequestURLStr];
  // 2,創(chuàng)建post請求
  NSMutableURLRequest *mutRequest = [[NSMutableURLRequest alloc]initWithURL:accessTokenRequestURL cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:10];
  //設(shè)置請求方式為POST，默認(rèn)為GET
  [mutRequest setHTTPMethod:@"POST"];
  
  // 3,連接服務(wù)器,并接收返回的數(shù)據(jù)
  NSData *receivedData = [NSURLConnection sendSynchronousRequest:mutRequest returningResponse:nil error:nil];
  // 將服務(wù)器返回的數(shù)據(jù)轉(zhuǎn)成字串(實質(zhì)是JSON數(shù)據(jù))
  NSString *responseStr = [[NSString alloc]initWithData:receivedData encoding:NSUTF8StringEncoding];
  log(@"Response json is :%@",responseStr);
  
  
  // 4,從responseStr中(實質(zhì)是JSON數(shù)據(jù))獲取到access_token
  // 將(JSON數(shù)據(jù))轉(zhuǎn)成字典先
  NSDictionary *dictionary = [NSJSONSerialization JSONObjectWithData:receivedData options:NSJSONReadingMutableContainers error:nil];
  
  // 通過鍵,取到access_token
  NSString *access_token = [dictionary objectForKey:@"access_token"];
  log(@"access token is:%@",access_token);
  // 通過鍵,取到用戶的uid
  NSString *uid = [dictionary objectForKey:@"uid"];
  log(@"uid is:%@",uid);
  
  // 授權(quán)成功,切換根控制器到主控制器
  UIActionSheet *actionSheet = [[UIActionSheet alloc]initWithTitle:@"授權(quán)成功" delegate:nil cancelButtonTitle:@"取消" destructiveButtonTitle:@"確定" otherButtonTitles: nil];
  [actionSheet showInView:self.view.window];

}
@end

{

  "access_token":"這個才是真正的ACCESS_TOKEN",

  "remind_in":"157679999",

  "expires_in":157679999,

  "uid":"授權(quán)了的那個用戶的uid"

}