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util.go
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util.go
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package gateway
import (
"context"
"encoding/base64"
"net/http"
"net/textproto"
"strconv"
"strings"
"google.golang.org/genproto/googleapis/api/annotations"
"google.golang.org/grpc/metadata"
"google.golang.org/protobuf/proto"
"google.golang.org/protobuf/reflect/protoreflect"
)
func fieldPathToDesc(fields protoreflect.FieldDescriptors, names ...string) []protoreflect.FieldDescriptor {
fds := make([]protoreflect.FieldDescriptor, len(names))
for i, name := range names {
fd := fields.ByJSONName(name)
if fd == nil {
fd = fields.ByName(protoreflect.Name(name))
}
if fd == nil {
return nil
}
fds[i] = fd
// advance
if i != len(fds)-1 {
msgDesc := fd.Message()
if msgDesc == nil {
return nil
}
fields = msgDesc.Fields()
}
}
return fds
}
func quote(raw []byte) []byte {
if n := len(raw); n > 0 && (raw[0] != '"' || raw[n-1] != '"') {
raw = strconv.AppendQuote(raw[:0], string(raw))
}
return raw
}
// getExtensionHTTP
func getExtensionHTTP(m protoreflect.MethodDescriptor) *annotations.HttpRule {
if m == nil {
return nil
}
if m.Options() == nil {
return nil
}
ext, ok := proto.GetExtension(m.Options(), annotations.E_Http).(*annotations.HttpRule)
if ok {
return ext
}
return nil
}
func setOutgoingHeader(header http.Header, md metadata.MD) {
for k, vs := range md {
if isReservedHeader(k) {
continue
}
if strings.HasSuffix(k, binHdrSuffix) {
dst := make([]string, len(vs))
for i, v := range vs {
dst[i] = encodeBinHeader([]byte(v))
}
vs = dst
}
header[textproto.CanonicalMIMEHeaderKey(k)] = vs
}
}
func isReservedHeader(k string) bool {
switch k {
case "content-type", "user-agent", "grpc-message-type", "grpc-encoding",
"grpc-message", "grpc-status", "grpc-timeout",
"grpc-status-details", "te":
return true
default:
return false
}
}
func isWhitelistedHeader(k string) bool {
switch k {
case ":authority", "user-agent":
return true
default:
return false
}
}
const binHdrSuffix = "-bin"
func encodeBinHeader(b []byte) string {
return base64.RawStdEncoding.EncodeToString(b)
}
func decodeBinHeader(v string) (s string, err error) {
var b []byte
if len(v)%4 == 0 {
// Input was padded, or padding was not necessary.
b, err = base64.RawStdEncoding.DecodeString(v)
} else {
b, err = base64.RawStdEncoding.DecodeString(v)
}
return string(b), err
}
func newIncomingContext(ctx context.Context, header http.Header) (context.Context, metadata.MD) {
md := make(metadata.MD, len(header))
for k, vs := range header {
k = strings.ToLower(k)
if isReservedHeader(k) && !isWhitelistedHeader(k) {
continue
}
if strings.HasSuffix(k, binHdrSuffix) {
dst := make([]string, len(vs))
for i, v := range vs {
v, err := decodeBinHeader(v)
if err != nil {
continue // TODO: log error?
}
dst[i] = v
}
vs = dst
}
md[k] = vs
}
return metadata.NewIncomingContext(ctx, md), md
}