mirror of
https://github.com/superseriousbusiness/gotosocial.git
synced 2025-10-31 02:22:26 -05:00
570 lines
15 KiB
Go
570 lines
15 KiB
Go
// Copyright 2019 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package impl
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import (
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"fmt"
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"math"
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"math/bits"
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"reflect"
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"unicode/utf8"
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"google.golang.org/protobuf/encoding/protowire"
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"google.golang.org/protobuf/internal/encoding/messageset"
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"google.golang.org/protobuf/internal/flags"
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"google.golang.org/protobuf/internal/genid"
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"google.golang.org/protobuf/internal/strs"
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"google.golang.org/protobuf/reflect/protoreflect"
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"google.golang.org/protobuf/reflect/protoregistry"
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"google.golang.org/protobuf/runtime/protoiface"
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)
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// ValidationStatus is the result of validating the wire-format encoding of a message.
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type ValidationStatus int
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const (
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// ValidationUnknown indicates that unmarshaling the message might succeed or fail.
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// The validator was unable to render a judgement.
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//
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// The only causes of this status are an aberrant message type appearing somewhere
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// in the message or a failure in the extension resolver.
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ValidationUnknown ValidationStatus = iota + 1
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// ValidationInvalid indicates that unmarshaling the message will fail.
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ValidationInvalid
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// ValidationValid indicates that unmarshaling the message will succeed.
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ValidationValid
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// ValidationWrongWireType indicates that a validated field does not have
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// the expected wire type.
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ValidationWrongWireType
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)
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func (v ValidationStatus) String() string {
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switch v {
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case ValidationUnknown:
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return "ValidationUnknown"
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case ValidationInvalid:
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return "ValidationInvalid"
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case ValidationValid:
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return "ValidationValid"
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default:
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return fmt.Sprintf("ValidationStatus(%d)", int(v))
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}
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}
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// Validate determines whether the contents of the buffer are a valid wire encoding
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// of the message type.
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//
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// This function is exposed for testing.
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func Validate(mt protoreflect.MessageType, in protoiface.UnmarshalInput) (out protoiface.UnmarshalOutput, _ ValidationStatus) {
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mi, ok := mt.(*MessageInfo)
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if !ok {
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return out, ValidationUnknown
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}
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if in.Resolver == nil {
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in.Resolver = protoregistry.GlobalTypes
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}
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o, st := mi.validate(in.Buf, 0, unmarshalOptions{
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flags: in.Flags,
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resolver: in.Resolver,
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})
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if o.initialized {
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out.Flags |= protoiface.UnmarshalInitialized
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}
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return out, st
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}
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type validationInfo struct {
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mi *MessageInfo
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typ validationType
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keyType, valType validationType
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// For non-required fields, requiredBit is 0.
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//
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// For required fields, requiredBit's nth bit is set, where n is a
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// unique index in the range [0, MessageInfo.numRequiredFields).
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//
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// If there are more than 64 required fields, requiredBit is 0.
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requiredBit uint64
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}
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type validationType uint8
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const (
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validationTypeOther validationType = iota
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validationTypeMessage
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validationTypeGroup
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validationTypeMap
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validationTypeRepeatedVarint
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validationTypeRepeatedFixed32
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validationTypeRepeatedFixed64
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validationTypeVarint
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validationTypeFixed32
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validationTypeFixed64
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validationTypeBytes
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validationTypeUTF8String
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validationTypeMessageSetItem
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)
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func newFieldValidationInfo(mi *MessageInfo, si structInfo, fd protoreflect.FieldDescriptor, ft reflect.Type) validationInfo {
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var vi validationInfo
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switch {
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case fd.ContainingOneof() != nil && !fd.ContainingOneof().IsSynthetic():
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switch fd.Kind() {
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case protoreflect.MessageKind:
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vi.typ = validationTypeMessage
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if ot, ok := si.oneofWrappersByNumber[fd.Number()]; ok {
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vi.mi = getMessageInfo(ot.Field(0).Type)
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}
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case protoreflect.GroupKind:
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vi.typ = validationTypeGroup
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if ot, ok := si.oneofWrappersByNumber[fd.Number()]; ok {
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vi.mi = getMessageInfo(ot.Field(0).Type)
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}
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case protoreflect.StringKind:
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if strs.EnforceUTF8(fd) {
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vi.typ = validationTypeUTF8String
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}
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}
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default:
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vi = newValidationInfo(fd, ft)
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}
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if fd.Cardinality() == protoreflect.Required {
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// Avoid overflow. The required field check is done with a 64-bit mask, with
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// any message containing more than 64 required fields always reported as
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// potentially uninitialized, so it is not important to get a precise count
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// of the required fields past 64.
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if mi.numRequiredFields < math.MaxUint8 {
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mi.numRequiredFields++
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vi.requiredBit = 1 << (mi.numRequiredFields - 1)
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}
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}
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return vi
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}
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func newValidationInfo(fd protoreflect.FieldDescriptor, ft reflect.Type) validationInfo {
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var vi validationInfo
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switch {
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case fd.IsList():
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switch fd.Kind() {
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case protoreflect.MessageKind:
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vi.typ = validationTypeMessage
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if ft.Kind() == reflect.Ptr {
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// Repeated opaque message fields are *[]*T.
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ft = ft.Elem()
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}
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if ft.Kind() == reflect.Slice {
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vi.mi = getMessageInfo(ft.Elem())
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}
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case protoreflect.GroupKind:
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vi.typ = validationTypeGroup
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if ft.Kind() == reflect.Ptr {
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// Repeated opaque message fields are *[]*T.
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ft = ft.Elem()
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}
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if ft.Kind() == reflect.Slice {
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vi.mi = getMessageInfo(ft.Elem())
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}
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case protoreflect.StringKind:
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vi.typ = validationTypeBytes
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if strs.EnforceUTF8(fd) {
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vi.typ = validationTypeUTF8String
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}
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default:
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switch wireTypes[fd.Kind()] {
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case protowire.VarintType:
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vi.typ = validationTypeRepeatedVarint
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case protowire.Fixed32Type:
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vi.typ = validationTypeRepeatedFixed32
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case protowire.Fixed64Type:
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vi.typ = validationTypeRepeatedFixed64
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}
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}
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case fd.IsMap():
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vi.typ = validationTypeMap
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switch fd.MapKey().Kind() {
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case protoreflect.StringKind:
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if strs.EnforceUTF8(fd) {
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vi.keyType = validationTypeUTF8String
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}
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}
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switch fd.MapValue().Kind() {
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case protoreflect.MessageKind:
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vi.valType = validationTypeMessage
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if ft.Kind() == reflect.Map {
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vi.mi = getMessageInfo(ft.Elem())
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}
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case protoreflect.StringKind:
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if strs.EnforceUTF8(fd) {
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vi.valType = validationTypeUTF8String
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}
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}
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default:
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switch fd.Kind() {
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case protoreflect.MessageKind:
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vi.typ = validationTypeMessage
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vi.mi = getMessageInfo(ft)
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case protoreflect.GroupKind:
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vi.typ = validationTypeGroup
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vi.mi = getMessageInfo(ft)
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case protoreflect.StringKind:
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vi.typ = validationTypeBytes
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if strs.EnforceUTF8(fd) {
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vi.typ = validationTypeUTF8String
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}
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default:
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switch wireTypes[fd.Kind()] {
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case protowire.VarintType:
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vi.typ = validationTypeVarint
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case protowire.Fixed32Type:
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vi.typ = validationTypeFixed32
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case protowire.Fixed64Type:
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vi.typ = validationTypeFixed64
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case protowire.BytesType:
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vi.typ = validationTypeBytes
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}
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}
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}
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return vi
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}
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func (mi *MessageInfo) validate(b []byte, groupTag protowire.Number, opts unmarshalOptions) (out unmarshalOutput, result ValidationStatus) {
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mi.init()
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type validationState struct {
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typ validationType
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keyType, valType validationType
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endGroup protowire.Number
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mi *MessageInfo
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tail []byte
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requiredMask uint64
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}
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// Pre-allocate some slots to avoid repeated slice reallocation.
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states := make([]validationState, 0, 16)
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states = append(states, validationState{
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typ: validationTypeMessage,
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mi: mi,
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})
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if groupTag > 0 {
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states[0].typ = validationTypeGroup
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states[0].endGroup = groupTag
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}
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initialized := true
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start := len(b)
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State:
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for len(states) > 0 {
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st := &states[len(states)-1]
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for len(b) > 0 {
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// Parse the tag (field number and wire type).
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var tag uint64
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if b[0] < 0x80 {
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tag = uint64(b[0])
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b = b[1:]
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} else if len(b) >= 2 && b[1] < 128 {
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tag = uint64(b[0]&0x7f) + uint64(b[1])<<7
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b = b[2:]
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} else {
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var n int
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tag, n = protowire.ConsumeVarint(b)
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if n < 0 {
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return out, ValidationInvalid
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}
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b = b[n:]
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}
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var num protowire.Number
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if n := tag >> 3; n < uint64(protowire.MinValidNumber) || n > uint64(protowire.MaxValidNumber) {
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return out, ValidationInvalid
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} else {
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num = protowire.Number(n)
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}
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wtyp := protowire.Type(tag & 7)
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if wtyp == protowire.EndGroupType {
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if st.endGroup == num {
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goto PopState
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}
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return out, ValidationInvalid
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}
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var vi validationInfo
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switch {
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case st.typ == validationTypeMap:
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switch num {
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case genid.MapEntry_Key_field_number:
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vi.typ = st.keyType
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case genid.MapEntry_Value_field_number:
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vi.typ = st.valType
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vi.mi = st.mi
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vi.requiredBit = 1
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}
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case flags.ProtoLegacy && st.mi.isMessageSet:
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switch num {
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case messageset.FieldItem:
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vi.typ = validationTypeMessageSetItem
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}
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default:
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var f *coderFieldInfo
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if int(num) < len(st.mi.denseCoderFields) {
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f = st.mi.denseCoderFields[num]
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} else {
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f = st.mi.coderFields[num]
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}
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if f != nil {
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vi = f.validation
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break
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}
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// Possible extension field.
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//
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// TODO: We should return ValidationUnknown when:
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// 1. The resolver is not frozen. (More extensions may be added to it.)
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// 2. The resolver returns preg.NotFound.
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// In this case, a type added to the resolver in the future could cause
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// unmarshaling to begin failing. Supporting this requires some way to
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// determine if the resolver is frozen.
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xt, err := opts.resolver.FindExtensionByNumber(st.mi.Desc.FullName(), num)
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if err != nil && err != protoregistry.NotFound {
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return out, ValidationUnknown
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}
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if err == nil {
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vi = getExtensionFieldInfo(xt).validation
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}
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}
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if vi.requiredBit != 0 {
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// Check that the field has a compatible wire type.
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// We only need to consider non-repeated field types,
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// since repeated fields (and maps) can never be required.
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ok := false
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switch vi.typ {
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case validationTypeVarint:
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ok = wtyp == protowire.VarintType
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case validationTypeFixed32:
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ok = wtyp == protowire.Fixed32Type
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case validationTypeFixed64:
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ok = wtyp == protowire.Fixed64Type
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case validationTypeBytes, validationTypeUTF8String, validationTypeMessage:
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ok = wtyp == protowire.BytesType
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case validationTypeGroup:
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ok = wtyp == protowire.StartGroupType
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}
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if ok {
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st.requiredMask |= vi.requiredBit
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}
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}
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switch wtyp {
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case protowire.VarintType:
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if len(b) >= 10 {
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switch {
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case b[0] < 0x80:
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b = b[1:]
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case b[1] < 0x80:
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b = b[2:]
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case b[2] < 0x80:
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b = b[3:]
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case b[3] < 0x80:
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b = b[4:]
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case b[4] < 0x80:
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b = b[5:]
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case b[5] < 0x80:
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b = b[6:]
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case b[6] < 0x80:
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b = b[7:]
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case b[7] < 0x80:
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b = b[8:]
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case b[8] < 0x80:
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b = b[9:]
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case b[9] < 0x80 && b[9] < 2:
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b = b[10:]
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default:
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return out, ValidationInvalid
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}
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} else {
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switch {
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case len(b) > 0 && b[0] < 0x80:
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b = b[1:]
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case len(b) > 1 && b[1] < 0x80:
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b = b[2:]
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case len(b) > 2 && b[2] < 0x80:
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b = b[3:]
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case len(b) > 3 && b[3] < 0x80:
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b = b[4:]
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case len(b) > 4 && b[4] < 0x80:
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b = b[5:]
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case len(b) > 5 && b[5] < 0x80:
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b = b[6:]
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case len(b) > 6 && b[6] < 0x80:
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b = b[7:]
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case len(b) > 7 && b[7] < 0x80:
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b = b[8:]
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case len(b) > 8 && b[8] < 0x80:
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b = b[9:]
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case len(b) > 9 && b[9] < 2:
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b = b[10:]
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default:
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return out, ValidationInvalid
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}
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}
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continue State
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case protowire.BytesType:
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var size uint64
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if len(b) >= 1 && b[0] < 0x80 {
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size = uint64(b[0])
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b = b[1:]
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} else if len(b) >= 2 && b[1] < 128 {
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size = uint64(b[0]&0x7f) + uint64(b[1])<<7
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b = b[2:]
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} else {
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var n int
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size, n = protowire.ConsumeVarint(b)
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if n < 0 {
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return out, ValidationInvalid
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}
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b = b[n:]
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}
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if size > uint64(len(b)) {
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return out, ValidationInvalid
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}
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v := b[:size]
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b = b[size:]
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switch vi.typ {
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case validationTypeMessage:
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if vi.mi == nil {
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return out, ValidationUnknown
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}
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vi.mi.init()
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fallthrough
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case validationTypeMap:
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if vi.mi != nil {
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vi.mi.init()
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}
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states = append(states, validationState{
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typ: vi.typ,
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keyType: vi.keyType,
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valType: vi.valType,
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mi: vi.mi,
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tail: b,
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})
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b = v
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continue State
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case validationTypeRepeatedVarint:
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// Packed field.
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for len(v) > 0 {
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_, n := protowire.ConsumeVarint(v)
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if n < 0 {
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return out, ValidationInvalid
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}
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v = v[n:]
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}
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case validationTypeRepeatedFixed32:
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// Packed field.
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if len(v)%4 != 0 {
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return out, ValidationInvalid
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}
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case validationTypeRepeatedFixed64:
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// Packed field.
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if len(v)%8 != 0 {
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return out, ValidationInvalid
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}
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case validationTypeUTF8String:
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if !utf8.Valid(v) {
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return out, ValidationInvalid
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}
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}
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case protowire.Fixed32Type:
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if len(b) < 4 {
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return out, ValidationInvalid
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}
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b = b[4:]
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case protowire.Fixed64Type:
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if len(b) < 8 {
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return out, ValidationInvalid
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}
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b = b[8:]
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case protowire.StartGroupType:
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switch {
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case vi.typ == validationTypeGroup:
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if vi.mi == nil {
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return out, ValidationUnknown
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}
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vi.mi.init()
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states = append(states, validationState{
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typ: validationTypeGroup,
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mi: vi.mi,
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endGroup: num,
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})
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continue State
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case flags.ProtoLegacy && vi.typ == validationTypeMessageSetItem:
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typeid, v, n, err := messageset.ConsumeFieldValue(b, false)
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if err != nil {
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return out, ValidationInvalid
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}
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xt, err := opts.resolver.FindExtensionByNumber(st.mi.Desc.FullName(), typeid)
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switch {
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case err == protoregistry.NotFound:
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b = b[n:]
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case err != nil:
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return out, ValidationUnknown
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default:
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xvi := getExtensionFieldInfo(xt).validation
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if xvi.mi != nil {
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xvi.mi.init()
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}
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states = append(states, validationState{
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typ: xvi.typ,
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mi: xvi.mi,
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tail: b[n:],
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})
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b = v
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continue State
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}
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default:
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n := protowire.ConsumeFieldValue(num, wtyp, b)
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if n < 0 {
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return out, ValidationInvalid
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}
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b = b[n:]
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}
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default:
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return out, ValidationInvalid
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}
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}
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if st.endGroup != 0 {
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return out, ValidationInvalid
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}
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if len(b) != 0 {
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return out, ValidationInvalid
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}
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b = st.tail
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PopState:
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numRequiredFields := 0
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switch st.typ {
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case validationTypeMessage, validationTypeGroup:
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numRequiredFields = int(st.mi.numRequiredFields)
|
|
case validationTypeMap:
|
|
// If this is a map field with a message value that contains
|
|
// required fields, require that the value be present.
|
|
if st.mi != nil && st.mi.numRequiredFields > 0 {
|
|
numRequiredFields = 1
|
|
}
|
|
}
|
|
// If there are more than 64 required fields, this check will
|
|
// always fail and we will report that the message is potentially
|
|
// uninitialized.
|
|
if numRequiredFields > 0 && bits.OnesCount64(st.requiredMask) != numRequiredFields {
|
|
initialized = false
|
|
}
|
|
states = states[:len(states)-1]
|
|
}
|
|
out.n = start - len(b)
|
|
if initialized {
|
|
out.initialized = true
|
|
}
|
|
return out, ValidationValid
|
|
}
|