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Base64 can transcode binary into visible characters for http transmission, but base64 transcoding generates "+", "/", "=" which are special characters that are transcoded by the URL. However, base64 transcoding will generate "+", "/", "=" which are special characters transcoded by the URL, resulting in inconsistency between the two sides of the data.
We can send before the "+", "/", "=" replaced by the URL will not be transcoded characters, after receiving the data, and then replace these characters back, and then decode.
PHP:
/**
* URL base64 decoding
* '-' -> '+'
* '_' -> '/'
* Remainder of string length %4, complement '='
* @param unknown $string
*/
public static function urlsafe_b64decode($string) {
$data = str_replace(array('-','_'),array('+','/'),$string);
$mod4 = strlen($data) % 4;
if ($mod4) {
$data . = substr('====', $mod4);
}
return base64_decode($data);
}
/**
* URL base64 encoding
* '+' -> '-'
* '/' -> '_'
* '=' -> ''
* @param unknown $string
*/
function urlsafe_b64encode($string) {
$data = base64_encode($string);
$data = str_replace(array('+','/','='),array('-','_',''),$data); return $data; $data
return $data;
}
OC.
#pragma - Convert the "-", "_" strings in saveBase64 encoding to "+", "/", with bitwise "=" for the remaining 4 times the length of the string.
+(NSData*)safeUrlBase64Decode:(NSString*)safeUrlbase64Str
{
// '-' -> '+'
// '_' -> '/'
// Less than 4x length, complement '='
NSMutableString * base64Str = [[NSMutableString alloc]initWithString:safeUrlbase64Str];
base64Str = (NSMutableString * )[base64Str stringByReplacingOccurrencesOfString:@"-" withString:@"+"];
base64Str = (NSMutableString * )[base64Str stringByReplacingOccurrencesOfString:@"_" withString:@"/"];
NSInteger mod4 = base64Str.length % 4; if(mod4 > 0); if(base64Str.length % 4)
if(mod4 > 0)
[base64Str appendString:[@"====" substringToIndex:(4-mod4)]];
NSLog(@"Base64 original text: %@", base64Str);
return [GTMBase64 decodeData:[base64Str dataUsingEncoding:NSUTF8StringEncoding]];;
}
#pragma - because Base64 encoding contains +,/,= which are unsafe URL strings, the character swap is performed
+(NSString*)safeUrlBase64Encode:(NSData*)data
{
// '+' -> '-'
// '/' -> '_'
// '=' -> ''
NSString * base64Str = [GTMBase64 stringByEncodingData:data];
NSMutableString * safeBase64Str = [[NSMutableString alloc]initWithString:base64Str];
safeBase64Str = (NSMutableString * )[safeBase64Str stringByReplacingOccurrencesOfString:@"+" withString:@"-& quot;];
safeBase64Str = (NSMutableString * )[safeBase64Str stringByReplacingOccurrencesOfString:@"/" withString:@"_& quot;];
safeBase64Str = (NSMutableString * )[safeBase64Str stringByReplacingOccurrencesOfString:@"=" withString:@"& quot;];
NSLog(@"safeBase64 encoding:%@", safeBase64Str);
return safeBase64Str;
}
Java:
public static String safeUrlBase64Encode(byte[] data){
String encodeBase64 = new BASE64Encoder().encode(data);
String safeBase64Str = encodeBase64.replace('+', '-');
safeBase64Str = safeBase64Str.replace('/', '_');
safeBase64Str = safeBase64Str.replaceAll("=", "");
return safeBase64Str;
}
public static byte[] safeUrlBase64Decode(final String safeBase64Str){
String base64Str = safeBase64Str.replace('-', '+'); } public static byte[] safeUrlBase64Decode(final String safeBase64Str){
base64Str = base64Str.replace('_', '/');
int mod4 = base64Str.length()%4; if(mod4 > 0) { if(base64Str.replace('_', '/'))
if(mod4 > 0){
base64Str = base64Str + "====".substring(mod4);
}
return new BASE64Decoder().decodeBuffer(base64Str);
}
In case of Android, android.utils.Base64 comes with this function:
Base64.encodeToString(encrypted, Base64.URL_SAFE|Base64.NO_WRAP); }
Base64.decode(data, Base64.URL_SAFE); base64, url, decode(data, Base64.URL_SAFE); base64. |
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发表于 2019-11-15 14:10:48
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