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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,204 @@ | ||
| // Copyright 2023-2024 Buf Technologies, Inc. | ||
| // | ||
| // 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. | ||
|
|
||
| package errors | ||
|
|
||
| import ( | ||
| "errors" | ||
| "fmt" | ||
| "strconv" | ||
| "strings" | ||
|
|
||
| "google.golang.org/protobuf/proto" | ||
| "google.golang.org/protobuf/reflect/protoreflect" | ||
| "google.golang.org/protobuf/reflect/protoregistry" | ||
| ) | ||
|
|
||
| // getFieldValue returns the field value at a given path, using the provided | ||
| // registry to resolve extensions. | ||
| func getFieldValue( | ||
| registry protoregistry.ExtensionTypeResolver, | ||
| message proto.Message, | ||
| path string, | ||
| ) (field protoreflect.Value, descriptor protoreflect.FieldDescriptor, err error) { | ||
| var name, subscript string | ||
| var atEnd, isExt bool | ||
| reflectMessage := message.ProtoReflect() | ||
| for !atEnd { | ||
| name, subscript, path, atEnd, isExt = parsePathElement(path) | ||
| if name == "" { | ||
| return protoreflect.Value{}, nil, errors.New("empty field name") | ||
| } | ||
| var descriptor protoreflect.FieldDescriptor | ||
| if isExt { | ||
| extension, err := registry.FindExtensionByName(protoreflect.FullName(name)) | ||
| if err != nil { | ||
| return protoreflect.Value{}, nil, fmt.Errorf("resolving extension: %w", err) | ||
| } | ||
| descriptor = extension.TypeDescriptor() | ||
| } else { | ||
| descriptor = reflectMessage.Descriptor().Fields().ByTextName(name) | ||
| } | ||
| if descriptor == nil { | ||
| return protoreflect.Value{}, nil, fmt.Errorf("field %s not found", name) | ||
| } | ||
| field = reflectMessage.Get(descriptor) | ||
| if subscript != "" { | ||
| descriptor, field, err = traverseSubscript(descriptor, subscript, field, name) | ||
| if err != nil { | ||
| return protoreflect.Value{}, nil, err | ||
| } | ||
| } else if descriptor.IsList() || descriptor.IsMap() { | ||
| if atEnd { | ||
| break | ||
| } | ||
| return protoreflect.Value{}, nil, fmt.Errorf("missing subscript on field %s", name) | ||
| } | ||
| if descriptor.Message() != nil { | ||
| reflectMessage = field.Message() | ||
| } | ||
| } | ||
| return field, descriptor, nil | ||
| } | ||
|
|
||
| func traverseSubscript( | ||
| descriptor protoreflect.FieldDescriptor, | ||
| subscript string, | ||
| field protoreflect.Value, | ||
| name string, | ||
| ) (protoreflect.FieldDescriptor, protoreflect.Value, error) { | ||
| switch { | ||
| case descriptor.IsList(): | ||
| i, err := strconv.Atoi(subscript) | ||
| if err != nil { | ||
| return nil, protoreflect.Value{}, fmt.Errorf("invalid list index: %s", subscript) | ||
| } | ||
| if !field.IsValid() || i >= field.List().Len() { | ||
| return nil, protoreflect.Value{}, fmt.Errorf("index %d out of bounds of field %s", i, name) | ||
| } | ||
| field = field.List().Get(i) | ||
| case descriptor.IsMap(): | ||
| key, err := parseMapKey(descriptor, subscript) | ||
| if err != nil { | ||
| return nil, protoreflect.Value{}, err | ||
| } | ||
| field = field.Map().Get(key) | ||
| if !field.IsValid() { | ||
| return nil, protoreflect.Value{}, fmt.Errorf("key %s not present on field %s", subscript, name) | ||
| } | ||
| descriptor = descriptor.MapValue() | ||
| default: | ||
| return nil, protoreflect.Value{}, fmt.Errorf("unexpected subscript on field %s", name) | ||
| } | ||
| return descriptor, field, nil | ||
| } | ||
|
|
||
| func parseMapKey(mapDescriptor protoreflect.FieldDescriptor, subscript string) (protoreflect.MapKey, error) { | ||
| switch mapDescriptor.MapKey().Kind() { | ||
| case protoreflect.BoolKind: | ||
| if boolValue, err := strconv.ParseBool(subscript); err == nil { | ||
| return protoreflect.MapKey(protoreflect.ValueOfBool(boolValue)), nil | ||
| } | ||
| case protoreflect.Int32Kind, protoreflect.Sint32Kind, protoreflect.Sfixed32Kind: | ||
| if intValue, err := strconv.ParseInt(subscript, 10, 32); err == nil { | ||
| return protoreflect.MapKey(protoreflect.ValueOfInt32(int32(intValue))), nil | ||
| } | ||
| case protoreflect.Int64Kind, protoreflect.Sint64Kind, protoreflect.Sfixed64Kind: | ||
| if intValue, err := strconv.ParseInt(subscript, 10, 64); err == nil { | ||
| return protoreflect.MapKey(protoreflect.ValueOfInt64(intValue)), nil | ||
| } | ||
| case protoreflect.Uint32Kind, protoreflect.Fixed32Kind: | ||
| if intValue, err := strconv.ParseUint(subscript, 10, 32); err == nil { | ||
| return protoreflect.MapKey(protoreflect.ValueOfUint32(uint32(intValue))), nil | ||
| } | ||
| case protoreflect.Uint64Kind, protoreflect.Fixed64Kind: | ||
| if intValue, err := strconv.ParseUint(subscript, 10, 64); err == nil { | ||
| return protoreflect.MapKey(protoreflect.ValueOfUint64(intValue)), nil | ||
| } | ||
| case protoreflect.StringKind: | ||
| if stringValue, err := strconv.Unquote(subscript); err == nil { | ||
| return protoreflect.MapKey(protoreflect.ValueOfString(stringValue)), nil | ||
| } | ||
| case protoreflect.EnumKind, protoreflect.FloatKind, protoreflect.DoubleKind, | ||
| protoreflect.BytesKind, protoreflect.MessageKind, protoreflect.GroupKind: | ||
| fallthrough | ||
| default: | ||
| // This should not occur, but it might if the rules are relaxed in the | ||
| // future. | ||
| return protoreflect.MapKey{}, fmt.Errorf("unsupported map key type: %s", mapDescriptor.MapKey().Kind()) | ||
| } | ||
| return protoreflect.MapKey{}, fmt.Errorf("invalid map key: %s", subscript) | ||
| } | ||
|
|
||
| // parsePathElement parses a single | ||
| func parsePathElement(path string) (name, subscript, rest string, atEnd bool, isExt bool) { | ||
| // Scan extension name. | ||
| if len(path) > 0 && path[0] == '[' { | ||
| if i := strings.IndexByte(path, ']'); i >= 0 { | ||
| isExt = true | ||
| name, path = path[1:i], path[i+1:] | ||
| } | ||
| } | ||
| // Scan field name. | ||
| if !isExt { | ||
| if i := strings.IndexAny(path, ".["); i >= 0 { | ||
| name, path = path[:i], path[i:] | ||
| } else { | ||
| name, path = path, "" | ||
| } | ||
| } | ||
| // No subscript: At end of path. | ||
| if len(path) == 0 { | ||
| return name, "", path, true, isExt | ||
| } | ||
| // No subscript: At end of path element. | ||
| if path[0] == '.' { | ||
| return name, "", path[1:], false, isExt | ||
| } | ||
| // Malformed subscript | ||
| if len(path) == 1 || path[1] == '.' { | ||
| name, path = name+path[:1], path[1:] | ||
| return name, "", path, true, isExt | ||
| } | ||
| switch path[1] { | ||
| case ']': | ||
| // Empty subscript | ||
| name, path = name+path[:2], path[2:] | ||
| case '`', '"', '\'': | ||
| // String subscript: must scan string. | ||
| var err error | ||
| subscript, err = strconv.QuotedPrefix(path[1:]) | ||
| if err == nil { | ||
| path = path[len(subscript)+2:] | ||
| } | ||
| default: | ||
| // Other subscript; can skip to next ] | ||
| if i := strings.IndexByte(path, ']'); i >= 0 { | ||
| subscript, path = path[1:i], path[i+1:] | ||
| } else { | ||
| // Unterminated subscript | ||
| return name + path, "", "", true, isExt | ||
| } | ||
| } | ||
| // No subscript: At end of path. | ||
| if len(path) == 0 { | ||
| return name, subscript, path, true, isExt | ||
| } | ||
| // No subscript: At end of path element. | ||
| if path[0] == '.' { | ||
| return name, subscript, path[1:], false, isExt | ||
| } | ||
| // Malformed element | ||
| return name, subscript, path, false, isExt | ||
| } |
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