1 //
2 //
3 // Copyright 2017 gRPC authors.
4 //
5 // Licensed under the Apache License, Version 2.0 (the "License");
6 // you may not use this file except in compliance with the License.
7 // You may obtain a copy of the License at
8 //
9 // http://www.apache.org/licenses/LICENSE-2.0
10 //
11 // Unless required by applicable law or agreed to in writing, software
12 // distributed under the License is distributed on an "AS IS" BASIS,
13 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 // See the License for the specific language governing permissions and
15 // limitations under the License.
16 //
17 //
18
19 #ifndef GRPC_SRC_CORE_LIB_SURFACE_VALIDATE_METADATA_H
20 #define GRPC_SRC_CORE_LIB_SURFACE_VALIDATE_METADATA_H
21
22 #include <grpc/support/port_platform.h>
23
24 #include <stdint.h>
25
26 #include <cstring>
27
28 #include "absl/strings/string_view.h"
29
30 #include <grpc/slice.h>
31 #include <grpc/support/log.h>
32
33 #include "src/core/lib/iomgr/error.h"
34
35 namespace grpc_core {
36
37 enum class ValidateMetadataResult : uint8_t {
38 kOk,
39 kCannotBeZeroLength,
40 kTooLong,
41 kIllegalHeaderKey,
42 kIllegalHeaderValue
43 };
44
45 const char* ValidateMetadataResultToString(ValidateMetadataResult result);
46
47 // Returns nullopt if the key is legal, otherwise returns an error message.
48 ValidateMetadataResult ValidateHeaderKeyIsLegal(absl::string_view key);
49
50 } // namespace grpc_core
51
52 grpc_error_handle grpc_validate_header_key_is_legal(const grpc_slice& slice);
53 grpc_error_handle grpc_validate_header_nonbin_value_is_legal(
54 const grpc_slice& slice);
55
56 int grpc_is_binary_header_internal(const grpc_slice& slice);
grpc_key_is_binary_header(const uint8_t * buf,size_t length)57 inline int grpc_key_is_binary_header(const uint8_t* buf, size_t length) {
58 if (length < 5) return 0;
59 return 0 == memcmp(buf + length - 4, "-bin", 4);
60 }
grpc_is_refcounted_slice_binary_header(const grpc_slice & slice)61 inline int grpc_is_refcounted_slice_binary_header(const grpc_slice& slice) {
62 GPR_DEBUG_ASSERT(slice.refcount != nullptr);
63 return grpc_key_is_binary_header(slice.data.refcounted.bytes,
64 slice.data.refcounted.length);
65 }
66
67 #endif // GRPC_SRC_CORE_LIB_SURFACE_VALIDATE_METADATA_H
68