[英]Encoding string arguments for URLs
I created a method to build URLs for me. 我创建了一种为我构建URL的方法。
- (NSString *)urlFor:(NSString *)path arguments:(NSDictionary *)args
{
NSString *format = @"http://api.example.com/%@?version=2.0.1";
NSMutableString *url = [NSMutableString stringWithFormat:format, path];
if ([args isKindOfClass:[NSDictionary class]]) {
for (NSString *key in args) {
[url appendString:[NSString stringWithFormat:@"&%@=%@", key, [args objectForKey:key]]];
}
}
return url;
}
When I try to build something like below, the URLs aren't encoded, of course. 当我尝试构建类似下面的内容时,URL当然不会被编码。
NSDictionary *args = [NSDictionary dictionaryWithObjectsAndKeys:
@"http://other.com", @"url",
@"ABCDEF", @"apiKey", nil];
NSLog(@"%@", [self urlFor:@"articles" arguments:args]);`
The returned value is http://api.example.com/articles?version=2.0.1&url=http://other.com&apiKey=ABCDEF when it should be http://api.example.com/articles?version=2.0.1&url=http%3A%2F%2Fother.com&apiKey=ABCDEF . 返回的值是http://api.example.com/articles?version=2.0.1&url=http://other.com&apiKey=ABCDEF应该是http://api.example.com/articles?version=2.0 .1&url = http%3A%2F%2Fother.com&apiKey = ABCDEF 。
I need to encode both key and value. 我需要对键和值进行编码。 I searched for something and found CFURLCreateStringByAddingPercentEscapes and stringByAddingPercentEscapesUsingEncoding but none of the tests I made worked. 我搜索了一些东西,发现了CFURLCreateStringByAddingPercentEscapes和stringByAddingPercentEscapesUsingEncoding但我没有做过任何测试。
How can I do it? 我该怎么做?
IIRC, slashes should be interpreted properly when they're in the query part of a URL. IIRC,当它们位于URL的查询部分时,应正确解释斜杠。 Did you test to see if it still works without encoded slashses? 您是否测试过它是否仍然可以在没有编码减少的情况下工作? Otherwise, do something like: 否则,请执行以下操作:
if ([args isKindOfClass:[NSDictionary class]]) {
for (NSString *key in [args allKeys]) {
NSString *value = [(NSString*)CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault, (CFStringRef)[args objectForKey:key], NULL, CFSTR("/?&:=#"), kCFStringEncodingUTF8) autorelease];
[url appendString:[NSString stringWithFormat:@"&%@=%@", key, value]];
[value release];
}
}
return url;
Note the value of the 4th argument to CFURLCreateStringByAddingPercentEscapes. 请注意CFURLCreateStringByAddingPercentEscapes的第4个参数的值。
You should consider using Google Toolbox for Mac's GTMNSString+URLArguments ; 您应该考虑使用Google Toolbox for Mac的GTMNSString + URLArguments ; it's designed for exactly this purpose. 它的设计正是为了这个目的。
I'd recommend our KSFileUtilities set of classes. 我推荐我们的KSFileUtilities类。 Your example would then be: 那么你的例子就是:
- (NSString *)urlFor:(NSString *)path arguments:(NSDictionary *)args
{
NSMutableDictionary *parameters = [NSMutableDictionary dictionaryWithDictionary:args];
[parameters setObject:@"2.0.1" forKey:@"version"];
NSURL *result = [NSURL ks_URLWithScheme:@"http"
host:@"api.example.com"
path:path
queryParameters:parameters;
return [result absoluteString];
}
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