Created
September 17, 2015 13:14
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Bag Labs Post - In-App Purchase Validation - Receipt Validation Part 3
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| func getProductIdFromReceipt(data:NSData) -> String? | |
| { | |
| var p = UnsafePointer<UInt8>(data.bytes) | |
| var dataLength = data.length | |
| var type:Int32 = 0 | |
| var tag:Int32 = 0 | |
| var length = 0 | |
| var end = p + dataLength | |
| ASN1_get_object(&p, &length, &type, &tag, end - p) | |
| if type != V_ASN1_SET { | |
| return nil | |
| } | |
| var integer: UnsafeMutablePointer<ASN1_INTEGER> | |
| while p < end | |
| { | |
| // Expecting an attribute sequence | |
| ASN1_get_object(&p, &length, &type, &tag, end - p) | |
| if type != V_ASN1_SEQUENCE { | |
| println("ASN1 error: expected an attribute sequence") | |
| } | |
| let seq_end = p.advancedBy(length) | |
| var attr_type = 0 | |
| var attr_version = 0 | |
| // The attribute is an integer | |
| ASN1_get_object(&p, &length, &type, &tag, end - p) | |
| if type != V_ASN1_INTEGER { | |
| println("ASN1 error: attribute not an integer") | |
| return nil | |
| } | |
| integer = c2i_ASN1_INTEGER(nil, &p, length) | |
| attr_type = ASN1_INTEGER_get(integer) | |
| ASN1_INTEGER_free(integer) | |
| // The version is an integer | |
| ASN1_get_object(&p, &length, &type, &tag, end - p) | |
| if type != V_ASN1_INTEGER { | |
| println("ASN1 error: version not an integer") | |
| return nil | |
| } | |
| integer = c2i_ASN1_INTEGER(nil, &p, length); | |
| attr_version = ASN1_INTEGER_get(integer); | |
| ASN1_INTEGER_free(integer); | |
| // The attribute value is an octet string | |
| ASN1_get_object(&p, &length, &type, &tag, end - p) | |
| if type != V_ASN1_OCTET_STRING { | |
| println("ASN1 error: value not an octet string") | |
| return nil | |
| } | |
| //For Product Id | |
| if attr_type == 1702 | |
| { | |
| if type == V_ASN1_OCTET_STRING | |
| { | |
| ASN1_get_object(&p, &length, &type, &tag, end - p) | |
| var productId = NSString(bytes: p, length: length, encoding: NSUTF8StringEncoding) | |
| return productId as? String | |
| } | |
| } | |
| p = p.advancedBy(length) | |
| } | |
| return nil | |
| } |
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