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/*
*
* Copyright 2015 gRPC authors.
*
* 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 "GRPCRequestHeaders.h"
#import <Foundation/Foundation.h>
#import "NSDictionary+GRPC.h"
// Used by the setter.
static void CheckIsNonNilASCII(NSString *name, NSString* value) {
if (!value) {
[NSException raise:NSInvalidArgumentException format:@"%@ cannot be nil", name];
}
if (![value canBeConvertedToEncoding:NSASCIIStringEncoding]) {
[NSException raise:NSInvalidArgumentException
format:@"%@ %@ contains non-ASCII characters", name, value];
}
}
// Precondition: key isn't nil.
static void CheckKeyValuePairIsValid(NSString *key, id value) {
if ([key hasSuffix:@"-bin"]) {
if (![value isKindOfClass:NSData.class]) {
[NSException raise:NSInvalidArgumentException
format:@"Expected NSData value for header %@ ending in \"-bin\", "
@"instead got %@", key, value];
}
} else {
if (![value isKindOfClass:NSString.class]) {
[NSException raise:NSInvalidArgumentException
format:@"Expected NSString value for header %@ not ending in \"-bin\", "
@"instead got %@", key, value];
}
CheckIsNonNilASCII(@"Text header value", (NSString *)value);
}
}
@implementation GRPCRequestHeaders {
__weak GRPCCall *_call;
// The NSMutableDictionary superclass doesn't hold any storage (so that people can implement their
// own in subclasses). As that's not the reason we're subclassing, we just delegate storage to the
// default NSMutableDictionary subclass returned by the cluster (e.g. __NSDictionaryM on iOS 9).
NSMutableDictionary *_delegate;
}
- (instancetype)init {
return [self initWithCall:nil];
}
- (instancetype)initWithCapacity:(NSUInteger)numItems {
return [self init];
}
- (instancetype)initWithCoder:(NSCoder *)aDecoder {
return [self init];
}
- (instancetype)initWithCall:(GRPCCall *)call {
return [self initWithCall:call storage:[NSMutableDictionary dictionary]];
}
// Designated initializer
- (instancetype)initWithCall:(GRPCCall *)call storage:(NSMutableDictionary *)storage {
// TODO(jcanizales): Throw if call or storage are nil.
if ((self = [super init])) {
_call = call;
_delegate = storage;
}
return self;
}
- (instancetype)initWithObjects:(const id _Nonnull __unsafe_unretained *)objects
forKeys:(const id<NSCopying> _Nonnull __unsafe_unretained *)keys
count:(NSUInteger)cnt {
return [self init];
}
- (void)checkCallIsNotStarted {
if (_call.state != GRXWriterStateNotStarted) {
[NSException raise:@"Invalid modification"
format:@"Cannot modify request headers after call is started"];
}
}
- (id)objectForKey:(NSString *)key {
return _delegate[key.lowercaseString];
}
- (void)setObject:(id)obj forKey:(NSString *)key {
[self checkCallIsNotStarted];
CheckIsNonNilASCII(@"Header name", key);
key = key.lowercaseString;
CheckKeyValuePairIsValid(key, obj);
_delegate[key] = obj;
}
- (void)removeObjectForKey:(NSString *)key {
[self checkCallIsNotStarted];
[_delegate removeObjectForKey:key.lowercaseString];
}
- (NSUInteger)count {
return _delegate.count;
}
- (NSEnumerator * _Nonnull)keyEnumerator {
return [_delegate keyEnumerator];
}
@end
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