iOSAPP实现H5⽀付⽰例总结
H5⽀付流程
1、发起下单请求()注:交易类型trade_type=MWEB
3、中间页进⾏H5权限的校验,安全性检查()
4、如果权限校验成功,⽀付中间页会发起⽀付请求。请求完毕跳到回调页⾯(由redirect_url决定)。APP需要在webView中监听这个请求,打开进⾏⽀付。如:
weixin://wap/pay?prepayid%3Dwx2718114258281033efb8751f1574826586&package=2965581453&noncestr=1545905512&sign=cb0f6dbd067549a04aada9c3eef09aac
5、⽀付完毕跳回APP。
Referer和redirect_url说明
HTTP Referer是header的⼀部分,当浏览器向web服务器发起请求的时,⼀般会带上Referer,告诉服务器我是从哪个页⾯链接过来。中间页会对Referer进⾏校验,⾮安全域名将不能正常加载。
redirect_url是中间页唤起⽀付之后,页⾯重定向的地址。中间页唤起⽀付后会跳转到指定的redirect_url。并且APP在⽀付完成时,也是通过redirect_url回调结
果,redirect_url⼀般是⼀个页⾯地址,所以⽀付完成会打开Safari浏览器。本⽂通过修改redirect_url,实现⽀付完毕跳回当前APP。
注意:会校验Referer(来源)和redirect_url(⽬标)是否是安全域名。如果不传redirect_url,会将Referer当成redirect_url,唤起⽀付之后会重定向到Referer对应的页⾯。
建议带上redirect_url。
代码实现
1、info.plist配置scheme
需要将H5⽀付的安全域名配置成scheme,⽀付完成会通过这个scheme跳转回APP。
<key>CFBundleURLTypes</key>
<array>
<dict>网页app
<key>CFBundleTypeRole</key>
<string>Editor</string>
<key>CFBundleURLName</key>
<string>wxPay</string>
<key>CFBundleURLSchemes</key>
<array>
<string>scheme(安全域名)</string> </array>
</dict>
</array>
<key>LSApplicationQueriesSchemes</key>
<array>
<string>wechat</string>
<string>weixin</string>
</array>
2、拦截中间页,截取redirect_url
//这个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:@"wx.tenpay"].location != NSNotFound) {
//截取redirect_url对应的值
NSDictionary *params = [HJStringHelper getUrlParam:newUrl];
NSString *backUrl = params[@"redirect_url"];
if ([backUrl isEqualToString:referer]) {
//截取redirect_url被替换成referer,不拦截
return YES;
}else{
//记录当前的redirectUrl,并拦截请求
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];
//设置授权域名
[request setValue:referer forHTTPHeaderField:@"Referer"];
[self.webView loadRequest:request];
});
return NO;
}
}
2、拦截中间页中打开请求
中间页加载成功后,会收到⼀个打开的请求,⽤openURL:打开这个url实现跳转到⽀付。
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、加载重定向地址
中间页跳转到时,会将页⾯从定向到redirect_url,由于redirect_url被我们修改为scheme,所以需要拦截这个⾮法的scheme请求,替换成记录下的redirect_url。
if([newUrl isEqualToString:referer]){
dispatch_async(dispatch_get_main_queue(), ^{
if (directUrl) {
//注意,这个地⽅需要对redirectUrl解码,因为截取的redirectUrl被完全编码了,需要先解码才能加载
NSMutableURLRequest* request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:[HJStringHelper directUrl]] cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:60.0];    [self.webView loadRequest:request];
}
});
return NO;
}
完整代码如下
以UIWebView为例
-(BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType{
/
/添加⽀付功能
NSURL *url = [request URL];
NSString *newUrl = url.absoluteString;
//获取安全域名
NSString *wxScheme = [h5WXPayScheme copy];
if (wxScheme.length>0) {
//使⽤安全域名拼接referer
NSString *referer = [NSString stringWithFormat:@"%@://",wxScheme];
if ([newUrl rangeOfString:@"wx.tenpay"].location != NSNotFound) {
NSDictionary *params = [HJStringHelper getUrlParam:newUrl];
NSString *backUrl = params[@"redirect_url"];
if ([backUrl isEqualToString:referer]) {
return YES;
}else{
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];
//设置授权域名
[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 (directUrl) {
NSMutableURLRequest* request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:[HJStringHelper directUrl]] cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:60.0];    [self.webView loadRequest:request];
}
});
return NO;
}
}
return [super webView:webView shouldStartLoadWithRequest:request navigationType:navigationType];
}
还有⼀篇⽂章讲的是H5⽀付封装,H5⽀付不仅可以在⽹页上使⽤,原⽣也可以调⽤。具体内容见
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