structjson.js
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/**
* Copyright 2017, Google, Inc.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* @fileoverview Utilities for converting between JSON and goog.protobuf.Struct
* proto.
*/
'use strict';
function jsonToStructProto(json) {
const fields = {};
for (let k in json) {
fields[k] = jsonValueToProto(json[k]);
}
return {fields};
}
const JSON_SIMPLE_TYPE_TO_PROTO_KIND_MAP = {
[typeof 0]: 'numberValue',
[typeof '']: 'stringValue',
[typeof false]: 'boolValue',
};
const JSON_SIMPLE_VALUE_KINDS = new Set([
'numberValue',
'stringValue',
'boolValue',
]);
function jsonValueToProto(value) {
const valueProto = {};
if (value === null) {
valueProto.kind = 'nullValue';
valueProto.nullValue = 'NULL_VALUE';
} else if (value instanceof Array) {
valueProto.kind = 'listValue';
valueProto.listValue = {values: value.map(jsonValueToProto)};
} else if (typeof value === 'object') {
valueProto.kind = 'structValue';
valueProto.structValue = jsonToStructProto(value);
} else if (typeof value in JSON_SIMPLE_TYPE_TO_PROTO_KIND_MAP) {
const kind = JSON_SIMPLE_TYPE_TO_PROTO_KIND_MAP[typeof value];
valueProto.kind = kind;
valueProto[kind] = value;
} else {
console.warn('Unsupported value type ', typeof value);
}
return valueProto;
}
function structProtoToJson(proto) {
if (!proto || !proto.fields) {
return {};
}
const json = {};
for (const k in proto.fields) {
json[k] = valueProtoToJson(proto.fields[k]);
}
return json;
}
function valueProtoToJson(proto) {
if (!proto || !proto.kind) {
return null;
}
if (JSON_SIMPLE_VALUE_KINDS.has(proto.kind)) {
return proto[proto.kind];
} else if (proto.kind === 'nullValue') {
return null;
} else if (proto.kind === 'listValue') {
if (!proto.listValue || !proto.listValue.values) {
console.warn('Invalid JSON list value proto: ', JSON.stringify(proto));
}
return proto.listValue.values.map(valueProtoToJson);
} else if (proto.kind === 'structValue') {
return structProtoToJson(proto.structValue);
} else {
console.warn('Unsupported JSON value proto kind: ', proto.kind);
return null;
}
}
module.exports = {
jsonToStructProto,
structProtoToJson,
};