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小編給大家分享一下iOS APP如何實(shí)現(xiàn)微信H5支付,相信大部分人都還不怎么了解,因此分享這篇文章給大家參考一下,希望大家閱讀完這篇文章后大有收獲,下面讓我們一起去了解一下吧!
微信H5支付流程
1、發(fā)起下單請(qǐng)求(調(diào)用統(tǒng)一下單接口)注:交易類型trade_type=MWEB
2、統(tǒng)一下單接口返回支付相關(guān)參數(shù)給商戶后臺(tái),如支付跳轉(zhuǎn)url(參數(shù)名“mweb_url”),商戶通過mweb_url調(diào)起微信支付中間頁。如:https://wx.tenpay.com/cgi-bin/mmpayweb-bin/checkmweb?prepay_id=wx27142704550165900edae5270331515985&package=600759311&redirect_url=http%3a%2f%2www.baidu.com
3、中間頁進(jìn)行H5權(quán)限的校驗(yàn),安全性檢查(具體錯(cuò)誤見微信官方文檔)
4、如果權(quán)限校驗(yàn)成功,微信支付中間頁會(huì)發(fā)起支付請(qǐng)求。請(qǐng)求完畢跳到回調(diào)頁面(由redirect_url決定)。APP需要在webView中監(jiān)聽這個(gè)請(qǐng)求,打開微信進(jìn)行支付。如:weixin://wap/pay?prepayid%3Dwx2718114258281033efb8751f1574826586&package=2965581453&noncestr=1545905512&sign=cb0f6dbd067549a04aada9c3eef09aac
5、微信支付完畢跳回APP。
Referer和redirect_url說明
HTTP Referer是header的一部分,當(dāng)瀏覽器向web服務(wù)器發(fā)起請(qǐng)求的時(shí),一般會(huì)帶上Referer,告訴服務(wù)器我是從哪個(gè)頁面鏈接過來。微信中間頁會(huì)對(duì)Referer進(jìn)行校驗(yàn),非安全域名將不能正常加載。
redirect_url是微信中間頁喚起微信支付之后,頁面重定向的地址。中間頁喚起微信支付后會(huì)跳轉(zhuǎn)到指定的redirect_url。并且微信APP在支付完成時(shí),也是通過redirect_url回調(diào)結(jié)果,redirect_url一般是一個(gè)頁面地址,所以微信支付完成會(huì)打開Safari瀏覽器。本文通過修改redirect_url,實(shí)現(xiàn)微信支付完畢跳回當(dāng)前APP。
注意:微信會(huì)校驗(yàn)Referer(來源)和redirect_url(目標(biāo))是否是安全域名。如果不傳redirect_url,微信會(huì)將Referer當(dāng)成redirect_url,喚起支付之后會(huì)重定向到Referer對(duì)應(yīng)的頁面。
建議帶上redirect_url。
代碼實(shí)現(xiàn)
1、info.plist配置scheme
需要將微信H5支付的安全域名配置成scheme,微信支付完成會(huì)通過這個(gè)scheme跳轉(zhuǎn)回APP。
<key>CFBundleURLTypes</key> <array> <dict> <key>CFBundleTypeRole</key> <string>Editor</string> <key>CFBundleURLName</key> <string>wxPay</string> <key>CFBundleURLSchemes</key> <array> <string>微信scheme(安全域名)</string> </array> </dict> </array> <key>LSApplicationQueriesSchemes</key> <array> <string>wechat</string> <string>weixin</string> </array>
2、攔截微信中間頁,截取redirect_url
再shouldStartLoadWithRequest:方法里面攔截微信中間頁(以“https://wx.tenpay.com”開頭的請(qǐng)求),截取redirect_url,如果redirect_url已經(jīng)被替換成scheme不攔截,如果沒有被替換,攔截請(qǐng)求,保存當(dāng)前的redirect_url。創(chuàng)建一個(gè)新的微信中間頁請(qǐng)求,將redirect_url替換成“安全域名://”(微信支付完畢會(huì)通過openURL打開當(dāng)前APP,如果不替換redirect_url,微信支付完畢會(huì)打開Safari瀏覽器。)。設(shè)置“Referer”為安全域名(微信會(huì)校驗(yàn)Referer,不是安全域名會(huì)加載失敗),重新load請(qǐng)求。
//這個(gè)referer和安全域名以及配置在info.plist中scheme一致 NSString *referer = [NSString stringWithFormat:@"%@://",wxScheme]; if ([newUrl rangeOfString:@"https://wx.tenpay.com"].location != NSNotFound) { //截取redirect_url對(duì)應(yīng)的值 NSDictionary *params = [HJStringHelper getUrlParam:newUrl]; NSString *backUrl = params[@"redirect_url"]; if ([backUrl isEqualToString:referer]) { //截取redirect_url被替換成referer,不攔截 return YES; }else{ //記錄當(dāng)前的redirectUrl,并攔截請(qǐng)求 self.redirectUrl = [HJStringHelper decodeURL:backUrl]; dispatch_async(dispatch_get_main_queue(), ^{ NSRange range = [newUrl rangeOfString:@"redirect_url="]; NSString *reqUrl; if (range.length>0) { reqUrl = [newUrl substringToIndex:range.location+range.length]; reqUrl = [reqUrl stringByAppendingString:referer]; }else{ reqUrl = [newUrl stringByAppendingString:[NSString stringWithFormat:@"&redirect_url=%@",referer]]; } NSMutableURLRequest* request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:reqUrl] cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:60.0]; //設(shè)置授權(quán)域名 [request setValue:referer forHTTPHeaderField:@"Referer"]; [self.webView loadRequest:request]; }); return NO; } }
2、攔截微信中間頁中打開微信請(qǐng)求
微信中間頁加載成功后,會(huì)收到一個(gè)打開微信的請(qǐng)求,用openURL:打開這個(gè)url實(shí)現(xiàn)跳轉(zhuǎn)到微信支付。
if([newUrl rangeOfString:@"weixin://wap/pay"].location != NSNotFound){ if ([[UIApplication sharedApplication] canOpenURL:url]) { if (@available(iOS 10.0, *)){ [[UIApplication sharedApplication] openURL:url options:@{} completionHandler:nil]; }else{ [[UIApplication sharedApplication] openURL:url]; } }else{ } return NO; }
3、加載重定向地址
微信中間頁跳轉(zhuǎn)到微信時(shí),會(huì)將頁面從定向到redirect_url,由于redirect_url被我們修改為scheme,所以需要攔截這個(gè)非法的scheme請(qǐng)求,替換成記錄下的redirect_url。
if([newUrl isEqualToString:referer]){ dispatch_async(dispatch_get_main_queue(), ^{ if (self.redirectUrl) { //注意,這個(gè)地方需要對(duì)redirectUrl解碼,因?yàn)榻厝〉膔edirectUrl被完全編碼了,需要先解碼才能加載 self.redirectUrl = [HJStringHelper decodeURL:self.redirectUrl]; NSMutableURLRequest* request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:[HJStringHelper encodeURL:self.redirectUrl]] cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:60.0]; [self.webView loadRequest:request]; self.redirectUrl = nil; } }); return NO; }
完整代碼如下
以UIWebView為例
-(BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType{ //添加微信支付功能 NSURL *url = [request URL]; NSString *newUrl = url.absoluteString; //獲取微信安全域名 NSString *wxScheme = [h6WXPayScheme copy]; if (wxScheme.length>0) { //使用安全域名拼接referer NSString *referer = [NSString stringWithFormat:@"%@://",wxScheme]; if ([newUrl rangeOfString:@"https://wx.tenpay.com"].location != NSNotFound) { NSDictionary *params = [HJStringHelper getUrlParam:newUrl]; NSString *backUrl = params[@"redirect_url"]; if ([backUrl isEqualToString:referer]) { return YES; }else{ self.redirectUrl = [HJStringHelper decodeURL:backUrl]; dispatch_async(dispatch_get_main_queue(), ^{ NSRange range = [newUrl rangeOfString:@"redirect_url="]; NSString *reqUrl; if (range.length>0) { reqUrl = [newUrl substringToIndex:range.location+range.length]; reqUrl = [reqUrl stringByAppendingString:referer]; }else{ reqUrl = [newUrl stringByAppendingString:[NSString stringWithFormat:@"&redirect_url=%@",referer]]; } NSMutableURLRequest* request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:reqUrl] cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:60.0]; //設(shè)置授權(quán)域名 [request setValue:referer forHTTPHeaderField:@"Referer"]; [self.webView loadRequest:request]; }); return NO; } }else if([newUrl rangeOfString:@"weixin://wap/pay"].location != NSNotFound){ if ([[UIApplication sharedApplication] canOpenURL:url]) { if (@available(iOS 10.0, *)){ [[UIApplication sharedApplication] openURL:url options:@{} completionHandler:nil]; }else{ [[UIApplication sharedApplication] openURL:url]; } }else{ } return NO; }else if([newUrl isEqualToString:referer]){ dispatch_async(dispatch_get_main_queue(), ^{ if (self.redirectUrl) { self.redirectUrl = [HJStringHelper decodeURL:self.redirectUrl]; NSMutableURLRequest* request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:[HJStringHelper encodeURL:self.redirectUrl]] cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:60.0]; [self.webView loadRequest:request]; self.redirectUrl = nil; } }); return NO; } } return [super webView:webView shouldStartLoadWithRequest:request navigationType:navigationType]; }
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