330 lines
10 KiB
Go
330 lines
10 KiB
Go
package runtime
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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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"regexp"
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"strconv"
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"strings"
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"time"
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"github.com/grpc-ecosystem/grpc-gateway/v2/utilities"
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"google.golang.org/genproto/protobuf/field_mask"
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"google.golang.org/grpc/grpclog"
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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/timestamppb"
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"google.golang.org/protobuf/types/known/wrapperspb"
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)
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var valuesKeyRegexp = regexp.MustCompile(`^(.*)\[(.*)\]$`)
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var currentQueryParser QueryParameterParser = &defaultQueryParser{}
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// QueryParameterParser defines interface for all query parameter parsers
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type QueryParameterParser interface {
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Parse(msg proto.Message, values url.Values, filter *utilities.DoubleArray) error
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}
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// PopulateQueryParameters parses query parameters
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// into "msg" using current query parser
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func PopulateQueryParameters(msg proto.Message, values url.Values, filter *utilities.DoubleArray) error {
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return currentQueryParser.Parse(msg, values, filter)
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}
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type defaultQueryParser struct{}
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// Parse populates "values" into "msg".
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// A value is ignored if its key starts with one of the elements in "filter".
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func (*defaultQueryParser) Parse(msg proto.Message, values url.Values, filter *utilities.DoubleArray) error {
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for key, values := range values {
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match := valuesKeyRegexp.FindStringSubmatch(key)
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if len(match) == 3 {
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key = match[1]
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values = append([]string{match[2]}, values...)
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}
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fieldPath := strings.Split(key, ".")
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if filter.HasCommonPrefix(fieldPath) {
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continue
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}
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if err := populateFieldValueFromPath(msg.ProtoReflect(), fieldPath, 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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// PopulateFieldFromPath sets a value in a nested Protobuf structure.
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func PopulateFieldFromPath(msg proto.Message, fieldPathString string, value string) error {
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fieldPath := strings.Split(fieldPathString, ".")
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return populateFieldValueFromPath(msg.ProtoReflect(), fieldPath, []string{value})
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}
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func populateFieldValueFromPath(msgValue 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 fieldDescriptor protoreflect.FieldDescriptor
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for i, fieldName := range fieldPath {
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fields := msgValue.Descriptor().Fields()
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// Get field by name
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fieldDescriptor = fields.ByName(protoreflect.Name(fieldName))
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if fieldDescriptor == nil {
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fieldDescriptor = fields.ByJSONName(fieldName)
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if fieldDescriptor == nil {
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// We're not returning an error here because this could just be
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// an extra query parameter that isn't part of the request.
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grpclog.Infof("field not found in %q: %q", msgValue.Descriptor().FullName(), strings.Join(fieldPath, "."))
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return nil
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}
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}
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// If this is the last element, we're done
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if i == len(fieldPath)-1 {
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break
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}
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// Only singular message fields are allowed
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if fieldDescriptor.Message() == nil || fieldDescriptor.Cardinality() == protoreflect.Repeated {
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return fmt.Errorf("invalid path: %q is not a message", fieldName)
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}
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// Get the nested message
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msgValue = msgValue.Mutable(fieldDescriptor).Message()
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}
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// Check if oneof already set
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if of := fieldDescriptor.ContainingOneof(); of != nil {
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if f := msgValue.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 fieldDescriptor.IsList():
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return populateRepeatedField(fieldDescriptor, msgValue.Mutable(fieldDescriptor).List(), values)
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case fieldDescriptor.IsMap():
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return populateMapField(fieldDescriptor, msgValue.Mutable(fieldDescriptor).Map(), 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", fieldDescriptor.FullName().Name(), strings.Join(values, ", "))
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}
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return populateField(fieldDescriptor, msgValue, values[0])
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}
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func populateField(fieldDescriptor protoreflect.FieldDescriptor, msgValue protoreflect.Message, value string) error {
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v, err := parseField(fieldDescriptor, value)
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if err != nil {
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return fmt.Errorf("parsing field %q: %w", fieldDescriptor.FullName().Name(), err)
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}
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msgValue.Set(fieldDescriptor, v)
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return nil
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}
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func populateRepeatedField(fieldDescriptor protoreflect.FieldDescriptor, list protoreflect.List, values []string) error {
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for _, value := range values {
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v, err := parseField(fieldDescriptor, value)
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if err != nil {
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return fmt.Errorf("parsing list %q: %w", fieldDescriptor.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(fieldDescriptor protoreflect.FieldDescriptor, mp protoreflect.Map, values []string) error {
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if len(values) != 2 {
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return fmt.Errorf("more than one value provided for key %q in map %q", values[0], fieldDescriptor.FullName())
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}
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key, err := parseField(fieldDescriptor.MapKey(), values[0])
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if err != nil {
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return fmt.Errorf("parsing map key %q: %w", fieldDescriptor.FullName().Name(), err)
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}
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value, err := parseField(fieldDescriptor.MapValue(), values[1])
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if err != nil {
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return fmt.Errorf("parsing map value %q: %w", fieldDescriptor.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(fieldDescriptor protoreflect.FieldDescriptor, value string) (protoreflect.Value, error) {
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switch fieldDescriptor.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(fieldDescriptor.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", fieldDescriptor.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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// Look for enum by name
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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.Atoi(value)
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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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// Look for enum by number
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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)
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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)
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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)
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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)
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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)
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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)
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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.URLEncoding.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(fieldDescriptor.Message(), value)
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default:
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panic(fmt.Sprintf("unknown field kind: %v", fieldDescriptor.Kind()))
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}
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}
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func parseMessage(msgDescriptor protoreflect.MessageDescriptor, value string) (protoreflect.Value, error) {
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var msg proto.Message
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switch msgDescriptor.FullName() {
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case "google.protobuf.Timestamp":
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if value == "null" {
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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 == "null" {
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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)
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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.DoubleValue{Value: v}
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case "google.protobuf.FloatValue":
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v, err := strconv.ParseFloat(value, 32)
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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.FloatValue{Value: float32(v)}
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case "google.protobuf.Int64Value":
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v, err := strconv.ParseInt(value, 10, 64)
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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.Int64Value{Value: v}
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case "google.protobuf.Int32Value":
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v, err := strconv.ParseInt(value, 10, 32)
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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.Int32Value{Value: int32(v)}
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case "google.protobuf.UInt64Value":
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v, err := strconv.ParseUint(value, 10, 64)
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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.UInt64Value{Value: v}
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case "google.protobuf.UInt32Value":
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v, err := strconv.ParseUint(value, 10, 32)
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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.UInt32Value{Value: 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.BoolValue{Value: v}
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case "google.protobuf.StringValue":
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msg = &wrapperspb.StringValue{Value: value}
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case "google.protobuf.BytesValue":
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v, err := base64.URLEncoding.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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msg = &wrapperspb.BytesValue{Value: v}
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case "google.protobuf.FieldMask":
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fm := &field_mask.FieldMask{}
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fm.Paths = append(fm.Paths, strings.Split(value, ",")...)
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msg = fm
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default:
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return protoreflect.Value{}, fmt.Errorf("unsupported message type: %q", string(msgDescriptor.FullName()))
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}
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return protoreflect.ValueOfMessage(msg.ProtoReflect()), nil
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}
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