如何在 iOS 中验证应用内购买收据？

验证应用内购买收据

应用内购买收据验证是确保通过应用程序进行的交易真实性和有效性的关键步骤你的应用程序。本文旨在通过分享已成功实现的全面代码示例，为在收据验证方面遇到困难的开发人员提供指导。

代码实现

要验证收据，请按照步骤如下：

1. 定义 verifyReceipt 方法，如下所示：

<code class="objective-c">- (BOOL)verifyReceipt:(SKPaymentTransaction *)transaction {
    // Encode receipt data
    NSString *jsonObjectString = [self encode:(uint8_t *)transaction.transactionReceipt.bytes length:transaction.transactionReceipt.length];
    
    // Construct URL with encoded receipt
    NSString *completeString = [NSString stringWithFormat:@"http://url-for-your-php?receipt=%@", jsonObjectString];
    NSURL *urlForValidation = [NSURL URLWithString:completeString];
    
    // Create request with HTTP GET method
    NSMutableURLRequest *validationRequest = [[NSMutableURLRequest alloc] initWithURL:urlForValidation];
    [validationRequest setHTTPMethod:@"GET"];
    
    // Send request synchronously
    NSData *responseData = [NSURLConnection sendSynchronousRequest:validationRequest returningResponse:nil error:nil];
    
    // Parse server response
    NSString *responseString = [[NSString alloc] initWithData:responseData encoding:NSUTF8StringEncoding];
    NSInteger response = [responseString integerValue];
    
    return (response == 0);
}</code>

2. 实现encode 方法以 Base64 编码收据数据：

<code class="objective-c">- (NSString *)encode:(const uint8_t *)input length:(NSInteger)length {
    // Define encoding table
    static char table[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
    
    // Create mutable data buffer
    NSMutableData *data = [NSMutableData dataWithLength:((length + 2) / 3) * 4];
    uint8_t *output = (uint8_t *)data.mutableBytes;
    
    // Encode data in loop
    for (NSInteger i = 0; i < length; i += 3) {
        NSInteger value = 0;
        for (NSInteger j = i; j < (i + 3); j++) {
            value <<= 8;
            if (j < length) {
                value |= (0xFF & input[j]);
            }
        }
        
        // Add encoded bytes to output
        NSInteger index = (i / 3) * 4;
        output[index + 0] = table[(value >> 18) & 0x3F];
        output[index + 1] = table[(value >> 12) & 0x3F];
        output[index + 2] = (i + 1) < length ? table[(value >> 6) & 0x3F] : '=';
        output[index + 3] = (i + 2) < length ? table[(value >> 0) & 0x3F] : '=';
    }
    
    return [[[NSString alloc] initWithData:data encoding:NSASCIIStringEncoding] autorelease];
}</code>

3. 从 SKPaymentTransactionObserver 委托方法调用 verifyReceipt 方法。
4. 在服务器端，使用 PHP 处理收据验证：

<code class="php"><?php

// Fetch receipt data from request parameter
$receipt = json_encode(array("receipt-data" => $_GET["receipt"]));

// Set URL for receipt verification
$url = "https://sandbox.itunes.apple.com/verifyReceipt";

// Send POST request with receipt data
$response_json = call-your-http-post-here($url, $receipt);

// Decode JSON response
$response = json_decode($response_json);

// Perform receipt verification and save data accordingly
echo $response->status;

?></code>

其他注意事项

• 根据环境（沙箱或生产），确保使用正确的 URL 进行收据验证。
• 注意URL 长度限制并考虑对大收据进行异步 HTTP 请求处理。
• 为了增加安全性，请考虑使用服务器端证书验证。

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