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json.go
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json.go
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package main
import (
"encoding/base64"
"encoding/json"
latlng "google.golang.org/genproto/googleapis/type/latlng"
"io/ioutil"
"math"
"regexp"
"strings"
"time"
)
var rfc3339regex, _ = regexp.Compile("^" + rfc3339pattern + "$")
// Return the corresponding firestore primitive value from an extended json
// primitive value, or nil if the value is not one of the extended json forms.
func extendedJsonValueToFirestoreValue(v map[string]interface{}) interface{} {
if content, ok := v["$boolean"]; ok {
return content.(bool)
} else if content, ok := v["$date"]; ok {
typedContent := content.(string)
timestamp, err := time.Parse(time.RFC3339Nano, typedContent)
if err != nil {
panic("Unexpected error parsing rfc3339")
}
return timestamp
} else if content, ok := v["$numberDouble"]; ok {
return content.(float64)
} else if content, ok := v["$numberInt"]; ok {
typedContent := content.(float64)
return int64(math.Round(typedContent))
} else if content, ok := v["$string"]; ok {
return content.(string)
} else if content, ok := v["$geopoint"]; ok {
typedContent := content.(map[string]interface{})
longitude := typedContent["$longitude"].(float64)
latitude := typedContent["$latitude"].(float64)
return &latlng.LatLng{Latitude: latitude, Longitude: longitude}
} else if content, ok := v["$binary"]; ok {
typedContent := content.(string)
data, err := base64.StdEncoding.DecodeString(typedContent)
if err != nil {
panic("Unexpected error decoding base64")
}
return data
} else {
return nil
}
}
// transformExtendedJsonMapToFirestoreMap traverses a map, replacing extended
// json values by the golang value used by the firestore library to represent
// the given type.
func transformExtendedJsonMapToFirestoreMap(m map[string]interface{}) {
for k, v := range m {
switch v := v.(type) {
case []interface{}:
transformExtendedJsonArrayToFirestoreArray(v)
case map[string]interface{}:
if len(v) == 1 {
if transformedValue := extendedJsonValueToFirestoreValue(v); transformedValue != nil {
m[k] = transformedValue
} else {
transformExtendedJsonMapToFirestoreMap(v)
}
} else {
transformExtendedJsonMapToFirestoreMap(v)
}
}
}
}
// transformExtendedJsonArrayToFirestoreArray traverses a slice, replacing
// extended json values by the golang value used by the firestore library to
// represent the given type.
func transformExtendedJsonArrayToFirestoreArray(slice []interface{}) {
for i, v := range slice {
switch v := v.(type) {
case []interface{}:
transformExtendedJsonArrayToFirestoreArray(v)
case map[string]interface{}:
if len(v) == 1 {
if transformedValue := extendedJsonValueToFirestoreValue(v); transformedValue != nil {
slice[i] = transformedValue
} else {
transformExtendedJsonMapToFirestoreMap(v)
}
} else {
transformExtendedJsonMapToFirestoreMap(v)
}
}
}
}
// Returns an extended json primitive value from a firestore primitive value.
func firestoreValueToExtendedJsonValue(v interface{}) interface{} {
switch v := v.(type) {
case float64:
if math.IsNaN(v) {
return map[string]interface{}{
"$numberDouble": nil,
}
} else {
return map[string]interface{}{
"$numberDouble": v,
}
}
case int64:
return map[string]interface{}{
"$numberInt": v,
}
case bool:
return map[string]interface{}{
"$boolean": v,
}
case time.Time:
return map[string]interface{}{
"$date": v.Format(time.RFC3339Nano),
}
case string:
return map[string]interface{}{
"$string": v,
}
case *latlng.LatLng:
return map[string]interface{}{
"$geopoint": map[string]interface{}{
"$latitude": v.Latitude,
"$longitude": v.Longitude,
},
}
case []byte:
return map[string]interface{}{
"$binary": base64.StdEncoding.EncodeToString(v),
}
default:
return v
}
}
// transformFirestoreMapToExtendedJsonMap transforms a firestore map to an extended json map.
func transformFirestoreMapToExtendedJsonMap(m map[string]interface{}) {
for k, v := range m {
switch v := v.(type) {
case []interface{}:
transformFirestoreArrayToExtendedJsonArray(v)
case map[string]interface{}:
transformFirestoreMapToExtendedJsonMap(v)
default:
m[k] = firestoreValueToExtendedJsonValue(v)
}
}
}
func transformFirestoreArrayToExtendedJsonArray(slice []interface{}) {
for i, v := range slice {
switch v := v.(type) {
case []interface{}:
transformFirestoreArrayToExtendedJsonArray(v)
case map[string]interface{}:
transformFirestoreMapToExtendedJsonMap(v)
default:
slice[i] = firestoreValueToExtendedJsonValue(v)
}
}
}
// Replaces all NaN values in an array by null, recursively.
func unNaNSlice(slice []interface{}) {
for i, v := range slice {
switch v := v.(type) {
case []interface{}:
unNaNSlice(v)
case map[string]interface{}:
unNaNMap(v)
case float64:
if math.IsNaN(v) {
slice[i] = nil
}
}
}
}
// Replaces all NaN values in an object by null, recursively.
func unNaNMap(m map[string]interface{}) {
for k, v := range m {
switch v := v.(type) {
case []interface{}:
unNaNSlice(v)
case map[string]interface{}:
unNaNMap(v)
case float64:
if math.IsNaN(v) {
m[k] = nil
}
}
}
}
// unmarshall data
func unmarshallData(data string) (map[string]interface{}, error) {
trimmed := strings.TrimSpace(data)
var buffer []byte
if strings.HasPrefix(trimmed, "{") {
buffer = []byte(trimmed)
} else {
var err error
buffer, err = ioutil.ReadFile(data)
if err != nil {
return nil, err
}
}
var object map[string]interface{}
err := json.Unmarshal(buffer, &object)
if err != nil {
return nil, err
}
return object, nil
}
func marshallData(object map[string]interface{}, extended bool) (string, error) {
if extended {
transformFirestoreMapToExtendedJsonMap(object)
} else {
unNaNMap(object)
}
buffer, err := json.MarshalIndent(object, "", " ")
if err != nil {
return "", err
}
return string(buffer), nil
}