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/*
* Copyright 2017 Google
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#import <CommonCrypto/CommonDigest.h>
#import "FStringUtilities.h"
#import "NSData+SRB64Additions.h"
@implementation FStringUtilities
// http://stackoverflow.com/questions/3468268/objective-c-sha1
// http://stackoverflow.com/questions/7310457/ios-objective-c-sha-1-and-base64-problem
+ (NSString *) base64EncodedSha1:(NSString *)str {
const char *cstr = [str cStringUsingEncoding:NSUTF8StringEncoding];
// NSString reports length in characters, but we want it in bytes, which strlen will give us.
unsigned long dataLen = strlen(cstr);
NSData *data = [NSData dataWithBytes:cstr length:dataLen];
uint8_t digest[CC_SHA1_DIGEST_LENGTH];
CC_SHA1(data.bytes, (unsigned int)data.length, digest);
NSData* output = [[NSData alloc] initWithBytes:digest length:CC_SHA1_DIGEST_LENGTH];
return [FSRUtilities base64EncodedStringFromData:output];
}
+ (NSString *) urlDecoded:(NSString *)url {
NSString* replaced = [url stringByReplacingOccurrencesOfString:@"+" withString:@" "];
NSString* decoded = [replaced stringByRemovingPercentEncoding];
// This is kind of a hack, but is generally how the js client works. We could run into trouble if
// some piece is a correctly escaped %-sequence, and another isn't. But, that's bad input anyways...
if (decoded) {
return decoded;
} else {
return replaced;
}
}
+ (NSString *) urlEncoded:(NSString *)url {
// Didn't seem like there was an Apple NSCharacterSet that had our version of the encoding
// So I made my own, following RFC 2396 https://www.ietf.org/rfc/rfc2396.txt
// allowedCharacters = alphanum | "-" | "_" | "~"
NSCharacterSet *allowedCharacters = [NSCharacterSet characterSetWithCharactersInString:@"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-_~"];
return [url stringByAddingPercentEncodingWithAllowedCharacters:allowedCharacters];
}
+ (NSString *) sanitizedForUserAgent:(NSString *)str {
return [str stringByReplacingOccurrencesOfString:@"/|_" withString:@"|" options:NSRegularExpressionSearch range:NSMakeRange(0, [str length])];
}
@end
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