// ParseSpecialKeys takes a JSON document and inspects it for any extended JSON
// type (e.g $numberLong) and replaces any such values with the corresponding
// BSON type.
func ParseSpecialKeys(doc map[string]interface{}) (interface{}, error) {
switch len(doc) {
case 1: // document has a single field
if jsonValue, ok := doc["$date"]; ok {
switch v := jsonValue.(type) {
case string:
return util.FormatDate(v)
case map[string]interface{}:
if jsonValue, ok := v["$numberLong"]; ok {
n, err := parseNumberLongField(jsonValue)
if err != nil {
return nil, err
}
return time.Unix(n/1e3, n%1e3*1e6), err
}
return nil, errors.New("expected $numberLong field in $date")
case json.Number:
n, err := v.Int64()
return time.Unix(n/1e3, n%1e3*1e6), err
case float64:
n := int64(v)
return time.Unix(n/1e3, n%1e3*1e6), nil
case int32:
n := int64(v)
return time.Unix(n/1e3, n%1e3*1e6), nil
case int64:
return time.Unix(v/1e3, v%1e3*1e6), nil
case json.ISODate:
return v, nil
default:
return nil, errors.New("invalid type for $date field")
}
}
if jsonValue, ok := doc["$code"]; ok {
switch v := jsonValue.(type) {
case string:
return bson.JavaScript{Code: v}, nil
default:
return nil, errors.New("expected $code field to have string value")
}
}
if jsonValue, ok := doc["$oid"]; ok {
switch v := jsonValue.(type) {
case string:
if !bson.IsObjectIdHex(v) {
return nil, errors.New("expected $oid field to contain 24 hexadecimal character")
}
return bson.ObjectIdHex(v), nil
default:
return nil, errors.New("expected $oid field to have string value")
}
}
if jsonValue, ok := doc["$numberLong"]; ok {
return parseNumberLongField(jsonValue)
}
if jsonValue, ok := doc["$numberInt"]; ok {
switch v := jsonValue.(type) {
case string:
// all of decimal, hex, and octal are supported here
n, err := strconv.ParseInt(v, 0, 32)
return int32(n), err
default:
return nil, errors.New("expected $numberInt field to have string value")
}
}
if jsonValue, ok := doc["$timestamp"]; ok {
ts := json.Timestamp{}
tsDoc, ok := jsonValue.(map[string]interface{})
if !ok {
return nil, errors.New("expected $timestamp key to have internal document")
}
if seconds, ok := tsDoc["t"]; ok {
if asUint32, err := util.ToUInt32(seconds); err == nil {
ts.Seconds = asUint32
} else {
return nil, errors.New("expected $timestamp 't' field to be a numeric type")
}
} else {
return nil, errors.New("expected $timestamp to have 't' field")
}
if inc, ok := tsDoc["i"]; ok {
if asUint32, err := util.ToUInt32(inc); err == nil {
ts.Increment = asUint32
} else {
return nil, errors.New("expected $timestamp 'i' field to be a numeric type")
}
} else {
return nil, errors.New("expected $timestamp to have 'i' field")
}
// see BSON spec for details on the bit fiddling here
return bson.MongoTimestamp(int64(ts.Seconds)<<32 | int64(ts.Increment)), nil
}
if _, ok := doc["$undefined"]; ok {
return bson.Undefined, nil
}
if _, ok := doc["$maxKey"]; ok {
return bson.MaxKey, nil
}
if _, ok := doc["$minKey"]; ok {
return bson.MinKey, nil
}
case 2: // document has two fields
if jsonValue, ok := doc["$code"]; ok {
code := bson.JavaScript{}
switch v := jsonValue.(type) {
case string:
code.Code = v
default:
return nil, errors.New("expected $code field to have string value")
}
if jsonValue, ok = doc["$scope"]; ok {
switch v2 := jsonValue.(type) {
case map[string]interface{}:
x, err := ParseSpecialKeys(v2)
if err != nil {
return nil, err
}
code.Scope = x
return code, nil
default:
return nil, errors.New("expected $scope field to contain map")
}
} else {
return nil, errors.New("expected $scope field with $code field")
}
}
if jsonValue, ok := doc["$regex"]; ok {
regex := bson.RegEx{}
switch pattern := jsonValue.(type) {
case string:
regex.Pattern = pattern
default:
return nil, errors.New("expected $regex field to have string value")
}
if jsonValue, ok = doc["$options"]; !ok {
return nil, errors.New("expected $options field with $regex field")
}
switch options := jsonValue.(type) {
case string:
regex.Options = options
default:
return nil, errors.New("expected $options field to have string value")
}
// Validate regular expression options
for i := range regex.Options {
switch o := regex.Options[i]; o {
default:
return nil, fmt.Errorf("invalid regular expression option '%v'", o)
case 'g', 'i', 'm', 's': // allowed
}
}
return regex, nil
}
if jsonValue, ok := doc["$binary"]; ok {
binary := bson.Binary{}
switch data := jsonValue.(type) {
case string:
bytes, err := base64.StdEncoding.DecodeString(data)
if err != nil {
return nil, err
}
binary.Data = bytes
default:
return nil, errors.New("expected $binary field to have string value")
}
if jsonValue, ok = doc["$type"]; !ok {
return nil, errors.New("expected $type field with $binary field")
}
switch typ := jsonValue.(type) {
case string:
kind, err := hex.DecodeString(typ)
if err != nil {
return nil, err
} else if len(kind) != 1 {
return nil, errors.New("expected single byte (as hexadecimal string) for $type field")
}
binary.Kind = kind[0]
default:
return nil, errors.New("expected $type field to have string value")
}
return binary, nil
}
if jsonValue, ok := doc["$ref"]; ok {
dbRef := mgo.DBRef{}
switch data := jsonValue.(type) {
case string:
dbRef.Collection = data
default:
return nil, errors.New("expected string for $ref field")
}
if jsonValue, ok = doc["$id"]; ok {
switch v2 := jsonValue.(type) {
case map[string]interface{}:
x, err := ParseSpecialKeys(v2)
if err != nil {
return nil, fmt.Errorf("error parsing $id field: %v", err)
}
dbRef.Id = x
default:
dbRef.Id = v2
}
return dbRef, nil
}
}
case 3:
if jsonValue, ok := doc["$ref"]; ok {
dbRef := mgo.DBRef{}
switch data := jsonValue.(type) {
case string:
dbRef.Collection = data
default:
return nil, errors.New("expected string for $ref field")
}
if jsonValue, ok = doc["$id"]; ok {
switch v2 := jsonValue.(type) {
case map[string]interface{}:
x, err := ParseSpecialKeys(v2)
if err != nil {
return nil, fmt.Errorf("error parsing $id field: %v", err)
}
dbRef.Id = x
default:
dbRef.Id = v2
}
if dbValue, ok := doc["$db"]; ok {
switch v3 := dbValue.(type) {
case string:
dbRef.Database = v3
default:
return nil, errors.New("expected string for $db field")
}
return dbRef, nil
}
}
}
}
// Did not match any special ('$') keys, so convert all sub-values.
return ConvertJSONValueToBSON(doc)
}
// ParseSpecialKeys takes a JSON document and inspects it for any
// special ('$') keys and replaces any values with the corresponding
// BSON type.
func ParseSpecialKeys(doc map[string]interface{}) (interface{}, error) {
switch len(doc) {
case 1: // document has a single field
if jsonValue, ok := doc["$date"]; ok {
var date time.Time
var err error
switch v := jsonValue.(type) {
case string:
for _, format := range acceptedDateFormats {
date, err = time.Parse(format, v)
if err == nil {
return date, nil
}
}
return date, err
case map[string]interface{}:
if jsonValue, ok := v["$numberLong"]; ok {
n, err := parseNumberLongField(jsonValue)
if err != nil {
return nil, err
}
return time.Unix(n/1e3, n%1e3*1e6), err
}
return nil, errors.New("Expected $numberLong field in $date")
case json.Number:
n, err := v.Int64()
return time.Unix(n/1e3, n%1e3*1e6), err
case float64:
n := int64(v)
return time.Unix(n/1e3, n%1e3*1e6), nil
case int64:
return time.Unix(v/1e3, v%1e3*1e6), nil
default:
return nil, errors.New("Invalid type for $date field")
}
}
if jsonValue, ok := doc["$oid"]; ok {
switch v := jsonValue.(type) {
case string:
if !bson.IsObjectIdHex(v) {
return nil, errors.New("Expected $oid field to contain 24 hexadecimal character")
}
return bson.ObjectIdHex(v), nil
default:
return nil, errors.New("Expected $oid field to have string value")
}
}
if jsonValue, ok := doc["$numberLong"]; ok {
return parseNumberLongField(jsonValue)
}
if jsonValue, ok := doc["$numberInt"]; ok {
switch v := jsonValue.(type) {
case string:
// all of decimal, hex, and octal are supported here
n, err := strconv.ParseInt(v, 0, 32)
return int32(n), err
default:
return nil, errors.New("Expected $numberInt field to have string value")
}
}
if _, ok := doc["$undefined"]; ok {
return bson.Undefined, nil
}
if _, ok := doc["$maxKey"]; ok {
return bson.MaxKey, nil
}
if _, ok := doc["$minKey"]; ok {
return bson.MinKey, nil
}
case 2: // document has two fields
if jsonValue, ok := doc["$regex"]; ok {
regex := bson.RegEx{}
switch pattern := jsonValue.(type) {
case string:
regex.Pattern = pattern
default:
return nil, errors.New("Expected $regex field to have string value")
}
if jsonValue, ok = doc["$options"]; !ok {
return nil, errors.New("Expected $options field with $regex field")
}
switch options := jsonValue.(type) {
case string:
regex.Options = options
default:
return nil, errors.New("Expected $options field to have string value")
}
// Validate regular expression options
for i := range regex.Options {
switch o := regex.Options[i]; o {
default:
return nil, fmt.Errorf("Invalid regular expression option '%v'", o)
case 'g', 'i', 'm', 's': // allowed
}
}
return regex, nil
}
if jsonValue, ok := doc["$binary"]; ok {
binary := bson.Binary{}
switch data := jsonValue.(type) {
case string:
bytes, err := base64.StdEncoding.DecodeString(data)
if err != nil {
return nil, err
}
binary.Data = bytes
default:
return nil, errors.New("Expected $binary field to have string value")
}
if jsonValue, ok = doc["$type"]; !ok {
return nil, errors.New("Expected $type field with $binary field")
}
switch typ := jsonValue.(type) {
case string:
kind, err := hex.DecodeString(typ)
if err != nil {
return nil, err
} else if len(kind) != 1 {
return nil, errors.New("Expected single byte (as hexadecimal string) for $type field")
}
binary.Kind = kind[0]
default:
return nil, errors.New("Expected $type field to have string value")
}
return binary, nil
}
}
// Did not match any special ('$') keys, so convert all sub-values.
return ConvertJSONValueToBSON(doc)
}