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333 lines
10 KiB
333 lines
10 KiB
package form
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import (
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"encoding/base64"
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"errors"
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"fmt"
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"net/url"
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"strconv"
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"strings"
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"time"
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"google.golang.org/protobuf/encoding/protojson"
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"google.golang.org/protobuf/types/known/structpb"
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"google.golang.org/protobuf/proto"
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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/types/known/durationpb"
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"google.golang.org/protobuf/types/known/fieldmaskpb"
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"google.golang.org/protobuf/types/known/timestamppb"
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"google.golang.org/protobuf/types/known/wrapperspb"
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)
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// DecodeValues decode url value into proto message.
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func DecodeValues(msg proto.Message, values url.Values) error {
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for key, values := range values {
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if err := populateFieldValues(msg.ProtoReflect(), strings.Split(key, "."), values); err != nil {
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return err
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}
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}
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return nil
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}
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func populateFieldValues(v protoreflect.Message, fieldPath []string, values []string) error {
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if len(fieldPath) < 1 {
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return errors.New("no field path")
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}
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if len(values) < 1 {
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return errors.New("no value provided")
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}
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var fd protoreflect.FieldDescriptor
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for i, fieldName := range fieldPath {
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if fd = getFieldDescriptor(v, fieldName); fd == nil {
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// ignore unexpected field.
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return nil
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}
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if i == len(fieldPath)-1 {
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break
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}
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if fd.Message() == nil || fd.Cardinality() == protoreflect.Repeated {
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if fd.IsMap() && len(fieldPath) > 1 {
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// post subfield
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return populateMapField(fd, v.Mutable(fd).Map(), []string{fieldPath[1]}, values)
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}
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return fmt.Errorf("invalid path: %q is not a message", fieldName)
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}
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v = v.Mutable(fd).Message()
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}
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if of := fd.ContainingOneof(); of != nil {
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if f := v.WhichOneof(of); f != nil {
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return fmt.Errorf("field already set for oneof %q", of.FullName().Name())
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}
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}
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switch {
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case fd.IsList():
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return populateRepeatedField(fd, v.Mutable(fd).List(), values)
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case fd.IsMap():
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return populateMapField(fd, v.Mutable(fd).Map(), fieldPath, values)
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}
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if len(values) > 1 {
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return fmt.Errorf("too many values for field %q: %s", fd.FullName().Name(), strings.Join(values, ", "))
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}
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return populateField(fd, v, values[0])
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}
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func getFieldDescriptor(v protoreflect.Message, fieldName string) protoreflect.FieldDescriptor {
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fields := v.Descriptor().Fields()
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var fd protoreflect.FieldDescriptor
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if fd = getDescriptorByFieldAndName(fields, fieldName); fd == nil {
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if v.Descriptor().FullName() == structMessageFullname {
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fd = fields.ByNumber(structFieldsFieldNumber)
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} else if len(fieldName) > 2 && strings.HasSuffix(fieldName, "[]") {
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fd = getDescriptorByFieldAndName(fields, strings.TrimSuffix(fieldName, "[]"))
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}
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}
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return fd
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}
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func getDescriptorByFieldAndName(fields protoreflect.FieldDescriptors, fieldName string) protoreflect.FieldDescriptor {
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var fd protoreflect.FieldDescriptor
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if fd = fields.ByName(protoreflect.Name(fieldName)); fd == nil {
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fd = fields.ByJSONName(fieldName)
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}
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return fd
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}
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func populateField(fd protoreflect.FieldDescriptor, v protoreflect.Message, value string) error {
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val, err := parseField(fd, value)
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if err != nil {
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return fmt.Errorf("parsing field %q: %w", fd.FullName().Name(), err)
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}
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v.Set(fd, val)
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return nil
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}
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func populateRepeatedField(fd protoreflect.FieldDescriptor, list protoreflect.List, values []string) error {
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for _, value := range values {
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v, err := parseField(fd, value)
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if err != nil {
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return fmt.Errorf("parsing list %q: %w", fd.FullName().Name(), err)
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}
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list.Append(v)
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}
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return nil
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}
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func populateMapField(fd protoreflect.FieldDescriptor, mp protoreflect.Map, fieldPath []string, values []string) error {
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flen := len(fieldPath)
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vlen := len(values)
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// post sub key.
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nkey := flen - 1
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key, err := parseField(fd.MapKey(), fieldPath[nkey])
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if err != nil {
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return fmt.Errorf("parsing map key %q: %w", fd.FullName().Name(), err)
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}
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vkey := vlen - 1
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value, err := parseField(fd.MapValue(), values[vkey])
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if err != nil {
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return fmt.Errorf("parsing map value %q: %w", fd.FullName().Name(), err)
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}
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mp.Set(key.MapKey(), value)
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return nil
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}
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func parseField(fd protoreflect.FieldDescriptor, value string) (protoreflect.Value, error) {
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switch fd.Kind() {
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case protoreflect.BoolKind:
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v, err := strconv.ParseBool(value)
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if err != nil {
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return protoreflect.Value{}, err
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}
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return protoreflect.ValueOfBool(v), nil
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case protoreflect.EnumKind:
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enum, err := protoregistry.GlobalTypes.FindEnumByName(fd.Enum().FullName())
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switch {
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case errors.Is(err, protoregistry.NotFound):
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return protoreflect.Value{}, fmt.Errorf("enum %q is not registered", fd.Enum().FullName())
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case err != nil:
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return protoreflect.Value{}, fmt.Errorf("failed to look up enum: %w", err)
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}
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v := enum.Descriptor().Values().ByName(protoreflect.Name(value))
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if v == nil {
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i, err := strconv.ParseInt(value, 10, 32) //nolint:gomnd
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if err != nil {
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return protoreflect.Value{}, fmt.Errorf("%q is not a valid value", value)
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}
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v = enum.Descriptor().Values().ByNumber(protoreflect.EnumNumber(i))
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if v == nil {
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return protoreflect.Value{}, fmt.Errorf("%q is not a valid value", value)
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}
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}
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return protoreflect.ValueOfEnum(v.Number()), nil
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case protoreflect.Int32Kind, protoreflect.Sint32Kind, protoreflect.Sfixed32Kind:
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v, err := strconv.ParseInt(value, 10, 32) //nolint:gomnd
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if err != nil {
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return protoreflect.Value{}, err
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}
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return protoreflect.ValueOfInt32(int32(v)), nil
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case protoreflect.Int64Kind, protoreflect.Sint64Kind, protoreflect.Sfixed64Kind:
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v, err := strconv.ParseInt(value, 10, 64) //nolint:gomnd
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if err != nil {
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return protoreflect.Value{}, err
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}
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return protoreflect.ValueOfInt64(v), nil
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case protoreflect.Uint32Kind, protoreflect.Fixed32Kind:
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v, err := strconv.ParseUint(value, 10, 32) //nolint:gomnd
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if err != nil {
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return protoreflect.Value{}, err
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}
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return protoreflect.ValueOfUint32(uint32(v)), nil
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case protoreflect.Uint64Kind, protoreflect.Fixed64Kind:
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v, err := strconv.ParseUint(value, 10, 64) //nolint:gomnd
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if err != nil {
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return protoreflect.Value{}, err
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}
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return protoreflect.ValueOfUint64(v), nil
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case protoreflect.FloatKind:
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v, err := strconv.ParseFloat(value, 32) //nolint:gomnd
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if err != nil {
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return protoreflect.Value{}, err
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}
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return protoreflect.ValueOfFloat32(float32(v)), nil
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case protoreflect.DoubleKind:
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v, err := strconv.ParseFloat(value, 64) //nolint:gomnd
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if err != nil {
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return protoreflect.Value{}, err
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}
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return protoreflect.ValueOfFloat64(v), nil
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case protoreflect.StringKind:
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return protoreflect.ValueOfString(value), nil
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case protoreflect.BytesKind:
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v, err := base64.StdEncoding.DecodeString(value)
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if err != nil {
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return protoreflect.Value{}, err
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}
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return protoreflect.ValueOfBytes(v), nil
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case protoreflect.MessageKind, protoreflect.GroupKind:
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return parseMessage(fd.Message(), value)
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default:
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panic(fmt.Sprintf("unknown field kind: %v", fd.Kind()))
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}
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}
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func parseMessage(md protoreflect.MessageDescriptor, value string) (protoreflect.Value, error) {
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var msg proto.Message
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switch md.FullName() {
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case "google.protobuf.Timestamp":
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if value == nullStr {
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break
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}
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t, err := time.Parse(time.RFC3339Nano, value)
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if err != nil {
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return protoreflect.Value{}, err
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}
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msg = timestamppb.New(t)
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case "google.protobuf.Duration":
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if value == nullStr {
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break
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}
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d, err := time.ParseDuration(value)
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if err != nil {
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return protoreflect.Value{}, err
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}
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msg = durationpb.New(d)
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case "google.protobuf.DoubleValue":
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v, err := strconv.ParseFloat(value, 64) //nolint:gomnd
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if err != nil {
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return protoreflect.Value{}, err
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}
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msg = wrapperspb.Double(v)
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case "google.protobuf.FloatValue":
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v, err := strconv.ParseFloat(value, 32) //nolint:gomnd
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if err != nil {
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return protoreflect.Value{}, err
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}
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msg = wrapperspb.Float(float32(v))
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case "google.protobuf.Int64Value":
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v, err := strconv.ParseInt(value, 10, 64) //nolint:gomnd
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if err != nil {
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return protoreflect.Value{}, err
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}
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msg = wrapperspb.Int64(v)
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case "google.protobuf.Int32Value":
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v, err := strconv.ParseInt(value, 10, 32) //nolint:gomnd
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if err != nil {
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return protoreflect.Value{}, err
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}
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msg = wrapperspb.Int32(int32(v))
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case "google.protobuf.UInt64Value":
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v, err := strconv.ParseUint(value, 10, 64) //nolint:gomnd
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if err != nil {
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return protoreflect.Value{}, err
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}
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msg = wrapperspb.UInt64(v)
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case "google.protobuf.UInt32Value":
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v, err := strconv.ParseUint(value, 10, 32) //nolint:gomnd
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if err != nil {
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return protoreflect.Value{}, err
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}
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msg = wrapperspb.UInt32(uint32(v))
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case "google.protobuf.BoolValue":
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v, err := strconv.ParseBool(value)
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if err != nil {
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return protoreflect.Value{}, err
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}
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msg = wrapperspb.Bool(v)
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case "google.protobuf.StringValue":
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msg = wrapperspb.String(value)
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case "google.protobuf.BytesValue":
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v, err := base64.StdEncoding.DecodeString(value)
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if err != nil {
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if v, err = base64.URLEncoding.DecodeString(value); err != nil {
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return protoreflect.Value{}, err
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}
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}
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msg = wrapperspb.Bytes(v)
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case "google.protobuf.FieldMask":
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fm := &fieldmaskpb.FieldMask{}
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for _, fv := range strings.Split(value, ",") {
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fm.Paths = append(fm.Paths, jsonSnakeCase(fv))
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}
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msg = fm
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case "google.protobuf.Value":
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fm, err := structpb.NewValue(value)
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if err != nil {
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return protoreflect.Value{}, err
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}
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msg = fm
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case "google.protobuf.Struct":
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var v structpb.Struct
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if err := protojson.Unmarshal([]byte(value), &v); err != nil {
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return protoreflect.Value{}, err
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}
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msg = &v
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default:
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return protoreflect.Value{}, fmt.Errorf("unsupported message type: %q", string(md.FullName()))
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}
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return protoreflect.ValueOfMessage(msg.ProtoReflect()), nil
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}
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// jsonSnakeCase converts a camelCase identifier to a snake_case identifier,
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// according to the protobuf JSON specification.
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// references: https://github.com/protocolbuffers/protobuf-go/blob/master/encoding/protojson/well_known_types.go#L864
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func jsonSnakeCase(s string) string {
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var b []byte
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for i := 0; i < len(s); i++ { // proto identifiers are always ASCII
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c := s[i]
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if isASCIIUpper(c) {
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b = append(b, '_')
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c += 'a' - 'A' // convert to lowercase
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}
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b = append(b, c)
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}
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return string(b)
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}
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func isASCIIUpper(c byte) bool {
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return 'A' <= c && c <= 'Z'
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}
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