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// Copyright 2020 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#import "FirebasePerformance/Sources/FPRDataUtils.h"
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#import "FirebasePerformance/Sources/Common/FPRConstants.h"
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#import "FirebasePerformance/Sources/FPRConsoleLogger.h"
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#pragma mark - Public functions
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NSString *FPRReservableName(NSString *name) {
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NSString *reservableName =
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[name stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]];
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if ([reservableName hasPrefix:kFPRInternalNamePrefix]) {
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FPRLogError(kFPRClientNameReserved, @"%@ prefix is reserved. Dropped %@.",
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kFPRInternalNamePrefix, reservableName);
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return nil;
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}
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if (reservableName.length == 0) {
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FPRLogError(kFPRClientNameLengthCheckFailed, @"Given name is empty.");
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return nil;
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}
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if (reservableName.length > kFPRMaxNameLength) {
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FPRLogError(kFPRClientNameLengthCheckFailed, @"%@ is greater than %d characters, dropping it.",
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reservableName, kFPRMaxNameLength);
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return nil;
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}
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return reservableName;
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}
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NSString *FPRReservableAttributeName(NSString *name) {
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NSString *reservableName =
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[name stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]];
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static NSArray<NSString *> *reservedPrefix = nil;
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static NSPredicate *characterCheck = nil;
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static dispatch_once_t onceToken;
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dispatch_once(&onceToken, ^{
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reservedPrefix = @[ @"firebase_", @"google_", @"ga_" ];
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NSString *characterRegex = @"[A-Z0-9a-z_]*";
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characterCheck = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", characterRegex];
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});
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__block BOOL containsReservedPrefix = NO;
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[reservedPrefix enumerateObjectsUsingBlock:^(NSString *prefix, NSUInteger idx, BOOL *stop) {
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if ([reservableName hasPrefix:prefix]) {
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FPRLogError(kFPRClientNameReserved, @"%@ prefix is reserved. Dropped %@.", prefix,
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reservableName);
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*stop = YES;
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containsReservedPrefix = YES;
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}
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}];
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if (containsReservedPrefix) {
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return nil;
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}
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if (reservableName.length == 0) {
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FPRLogError(kFPRClientNameLengthCheckFailed, @"Given name is empty.");
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return nil;
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}
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if ([characterCheck evaluateWithObject:reservableName] == NO) {
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FPRLogError(kFPRAttributeNameIllegalCharacters,
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@"Illegal characters used for attribute name, "
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"characters allowed are alphanumeric or underscore.");
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return nil;
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}
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if (reservableName.length > kFPRMaxAttributeNameLength) {
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FPRLogError(kFPRClientNameLengthCheckFailed, @"%@ is greater than %d characters, dropping it.",
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reservableName, kFPRMaxAttributeNameLength);
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return nil;
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}
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return reservableName;
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}
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NSString *FPRValidatedAttributeValue(NSString *value) {
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if (value.length == 0) {
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FPRLogError(kFPRClientNameLengthCheckFailed, @"Given value is empty.");
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return nil;
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}
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if (value.length > kFPRMaxAttributeValueLength) {
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FPRLogError(kFPRClientNameLengthCheckFailed, @"%@ is greater than %d characters, dropping it.",
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value, kFPRMaxAttributeValueLength);
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return nil;
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}
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return value;
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}
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NSString *FPRTruncatedURLString(NSString *URLString) {
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NSString *truncatedURLString = URLString;
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NSString *pathSeparator = @"/";
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if (truncatedURLString.length > kFPRMaxURLLength) {
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NSString *truncationCharacter =
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[truncatedURLString substringWithRange:NSMakeRange(kFPRMaxURLLength, 1)];
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truncatedURLString = [URLString substringToIndex:kFPRMaxURLLength];
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if (![pathSeparator isEqual:truncationCharacter]) {
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NSRange rangeOfTruncation = [truncatedURLString rangeOfString:pathSeparator
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options:NSBackwardsSearch];
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truncatedURLString = [URLString substringToIndex:rangeOfTruncation.location];
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}
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FPRLogWarning(kFPRClientNameTruncated, @"URL exceeds %d characters. Truncated url: %@",
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kFPRMaxURLLength, truncatedURLString);
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}
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return truncatedURLString;
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}
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NSString *FPRValidatedMccMnc(NSString *mcc, NSString *mnc) {
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if ([mcc length] != 3 || [mnc length] < 2 || [mnc length] > 3) return nil;
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static NSCharacterSet *notDigits;
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static dispatch_once_t token;
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dispatch_once(&token, ^{
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notDigits = [[NSCharacterSet decimalDigitCharacterSet] invertedSet];
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});
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NSString *mccMnc = [mcc stringByAppendingString:mnc];
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if ([mccMnc rangeOfCharacterFromSet:notDigits].location != NSNotFound) return nil;
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return mccMnc;
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}
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