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/slice.h>
23 #include <grpc/support/port_platform.h>
24 #include <stdint.h>
25
26 #include <cstring>
27
28 #include "absl/log/check.h"
29 #include "absl/strings/string_view.h"
30 #include "src/core/lib/iomgr/error.h"
31
32 namespace grpc_core {
33
34 enum class ValidateMetadataResult : uint8_t {
35 kOk,
36 kCannotBeZeroLength,
37 kTooLong,
38 kIllegalHeaderKey,
39 kIllegalHeaderValue
40 };
41
42 const char* ValidateMetadataResultToString(ValidateMetadataResult result);
43
44 // Returns nullopt if the key is legal, otherwise returns an error message.
45 ValidateMetadataResult ValidateHeaderKeyIsLegal(absl::string_view key);
46
47 } // namespace grpc_core
48
49 grpc_error_handle grpc_validate_header_key_is_legal(const grpc_slice& slice);
50 grpc_error_handle grpc_validate_header_nonbin_value_is_legal(
51 const grpc_slice& slice);
52
53 int grpc_is_binary_header_internal(const grpc_slice& slice);
grpc_key_is_binary_header(const uint8_t * buf,size_t length)54 inline int grpc_key_is_binary_header(const uint8_t* buf, size_t length) {
55 if (length < 5) return 0;
56 return 0 == memcmp(buf + length - 4, "-bin", 4);
57 }
grpc_is_refcounted_slice_binary_header(const grpc_slice & slice)58 inline int grpc_is_refcounted_slice_binary_header(const grpc_slice& slice) {
59 DCHECK_NE(slice.refcount, nullptr);
60 return grpc_key_is_binary_header(slice.data.refcounted.bytes,
61 slice.data.refcounted.length);
62 }
63
64 #endif // GRPC_SRC_CORE_LIB_SURFACE_VALIDATE_METADATA_H
65