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				|  |  | +/*
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				|  |  | + *
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				|  |  | + * Copyright 2015, Google Inc.
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				|  |  | + * All rights reserved.
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				|  |  | + *
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				|  |  | + * Redistribution and use in source and binary forms, with or without
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				|  |  | + * modification, are permitted provided that the following conditions are
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				|  |  | + * met:
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				|  |  | + *
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				|  |  | + *     * Redistributions of source code must retain the above copyright
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				|  |  | + * notice, this list of conditions and the following disclaimer.
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				|  |  | + *     * Redistributions in binary form must reproduce the above
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				|  |  | + * copyright notice, this list of conditions and the following disclaimer
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				|  |  | + * in the documentation and/or other materials provided with the
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				|  |  | + * distribution.
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				|  |  | + *     * Neither the name of Google Inc. nor the names of its
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				|  |  | + * contributors may be used to endorse or promote products derived from
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				|  |  | + * this software without specific prior written permission.
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				|  |  | + *
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				|  |  | + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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				|  |  | + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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				|  |  | + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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				|  |  | + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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				|  |  | + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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				|  |  | + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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				|  |  | + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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				|  |  | + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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				|  |  | + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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				|  |  | + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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				|  |  | + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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				|  |  | + *
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				|  |  | + */
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				|  |  | +
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				|  |  | +#import "GRPCRequestHeaders.h"
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				|  |  | +
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				|  |  | +#import <Foundation/Foundation.h>
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				|  |  | +
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				|  |  | +#import "GRPCCall.h"
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				|  |  | +#import "NSDictionary+GRPC.h"
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				|  |  | +
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				|  |  | +// Used by the setter.
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				|  |  | +static void CheckIsNonNilASCII(NSString *name, NSString* value) {
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				|  |  | +  if (!value) {
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				|  |  | +    [NSException raise:NSInvalidArgumentException format:@"%@ cannot be nil", name];
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				|  |  | +  }
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				|  |  | +  if (![value canBeConvertedToEncoding:NSASCIIStringEncoding]) {
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				|  |  | +    [NSException raise:NSInvalidArgumentException
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				|  |  | +                format:@"%@ %@ contains non-ASCII characters", name, value];
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				|  |  | +  }
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				|  |  | +}
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				|  |  | +
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				|  |  | +// Precondition: key isn't nil.
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				|  |  | +static void CheckKeyValuePairIsValid(NSString *key, id value) {
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				|  |  | +  if ([key hasSuffix:@"-bin"]) {
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				|  |  | +    if (![value isKindOfClass:NSData.class]) {
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				|  |  | +      [NSException raise:NSInvalidArgumentException
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				|  |  | +                  format:@"Expected NSData value for header %@ ending in \"-bin\", "
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				|  |  | +       @"instead got %@", key, value];
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				|  |  | +    }
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				|  |  | +  } else {
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				|  |  | +    if (![value isKindOfClass:NSString.class]) {
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				|  |  | +      [NSException raise:NSInvalidArgumentException
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				|  |  | +                  format:@"Expected NSString value for header %@ not ending in \"-bin\", "
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				|  |  | +       @"instead got %@", key, value];
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				|  |  | +    }
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				|  |  | +    CheckIsNonNilASCII(@"Text header value", (NSString *)value);
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				|  |  | +  }
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				|  |  | +}
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				|  |  | +
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				|  |  | +@implementation GRPCRequestHeaders {
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				|  |  | +  __weak GRPCCall *_call;
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				|  |  | +  NSMutableDictionary *_delegate;
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				|  |  | +}
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				|  |  | +
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				|  |  | +- (instancetype)initWithCall:(GRPCCall *)call {
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				|  |  | +  if ((self = [super init])) {
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				|  |  | +    _call = call;
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				|  |  | +    _delegate = [NSMutableDictionary dictionary];
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				|  |  | +  }
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				|  |  | +  return self;
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				|  |  | +}
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				|  |  | +
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				|  |  | +- (void)checkCallIsNotStarted {
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				|  |  | +  if (_call.state != GRXWriterStateNotStarted) {
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				|  |  | +    [NSException raise:@"Invalid modification"
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				|  |  | +                format:@"Cannot modify request headers after call is started"];
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				|  |  | +  }
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				|  |  | +}
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				|  |  | +
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				|  |  | +- (id)objectForKeyedSubscript:(NSString *)key {
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				|  |  | +  return _delegate[key.lowercaseString];
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				|  |  | +}
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				|  |  | +
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				|  |  | +- (void)setObject:(id)obj forKeyedSubscript:(NSString *)key {
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				|  |  | +  [self checkCallIsNotStarted];
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				|  |  | +  CheckIsNonNilASCII(@"Header name", key);
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				|  |  | +  key = key.lowercaseString;
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				|  |  | +  CheckKeyValuePairIsValid(key, obj);
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				|  |  | +  _delegate[key] = obj;
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				|  |  | +}
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				|  |  | +
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				|  |  | +- (void)removeObjectForKey:(NSString *)key {
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				|  |  | +  [self checkCallIsNotStarted];
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				|  |  | +  [_delegate removeObjectForKey:key.lowercaseString];
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				|  |  | +}
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				|  |  | +
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				|  |  | +- (void)removeAllObjects {
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				|  |  | +  [self checkCallIsNotStarted];
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				|  |  | +  [_delegate removeAllObjects];
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				|  |  | +}
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				|  |  | +
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				|  |  | +- (NSUInteger)count {
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				|  |  | +  return _delegate.count;
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				|  |  | +}
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				|  |  | +
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				|  |  | +- (grpc_metadata *)grpc_metadataArray {
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				|  |  | +  return _delegate.grpc_metadataArray;
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				|  |  | +}
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				|  |  | +@end
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