graphql-scalars
Version:
A collection of scalar types not included in base GraphQL.
83 lines (82 loc) • 3.27 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.GraphQLByte = exports.GraphQLByteConfig = void 0;
const graphql_1 = require("graphql");
const error_js_1 = require("../error.js");
const base64Validator = /^(?:[A-Za-z0-9+\/]{4})*(?:[A-Za-z0-9+\/]{2}==|[A-Za-z0-9+\/]{3}=)?$/;
function hexValidator(value) {
// Ensure that any leading 0 is removed from the hex string to avoid false negatives.
const sanitizedValue = value.charAt(0) === '0' ? value.slice(1) : value;
// For larger strings, we run into issues with MAX_SAFE_INTEGER, so split the string
// into smaller pieces to avoid this issue.
if (value.length > 8) {
let parsedString = '';
for (let startIndex = 0, endIndex = 8; startIndex < value.length; startIndex += 8, endIndex += 8) {
parsedString += parseInt(value.slice(startIndex, endIndex), 16).toString(16);
}
return parsedString === sanitizedValue;
}
return parseInt(value, 16).toString(16) === sanitizedValue;
}
function validate(value, ast) {
if (typeof value !== 'string' && !(value instanceof global.Buffer)) {
throw (0, error_js_1.createGraphQLError)(`Value is not an instance of Buffer: ${JSON.stringify(value)}`, ast
? {
nodes: ast,
}
: undefined);
}
if (typeof value === 'string') {
const isBase64 = base64Validator.test(value);
const isHex = hexValidator(value);
if (!isBase64 && !isHex) {
throw (0, error_js_1.createGraphQLError)(`Value is not a valid base64 or hex encoded string: ${JSON.stringify(value)}`, ast
? {
nodes: ast,
}
: undefined);
}
return global.Buffer.from(value, isHex ? 'hex' : 'base64');
}
return value;
}
function parseObject(ast) {
const key = ast.fields[0].value;
const value = ast.fields[1].value;
if (ast.fields.length === 2 &&
key.kind === graphql_1.Kind.STRING &&
key.value === 'Buffer' &&
value.kind === graphql_1.Kind.LIST) {
return global.Buffer.from(value.values.map((astValue) => parseInt(astValue.value)));
}
throw (0, error_js_1.createGraphQLError)(`Value is not a JSON representation of Buffer: ${(0, graphql_1.print)(ast)}`, {
nodes: [ast],
});
}
exports.GraphQLByteConfig =
/*#__PURE__*/ {
name: 'Byte',
description: 'The `Byte` scalar type represents byte value as a Buffer',
serialize: validate,
parseValue: validate,
parseLiteral(ast) {
switch (ast.kind) {
case graphql_1.Kind.STRING:
return validate(ast.value, ast);
case graphql_1.Kind.OBJECT:
return parseObject(ast);
default:
throw (0, error_js_1.createGraphQLError)(`Can only parse base64 or hex encoded strings as Byte, but got a: ${ast.kind}`, {
nodes: [ast],
});
}
},
extensions: {
codegenScalarType: 'Buffer | string',
jsonSchema: {
type: 'string',
format: 'byte',
},
},
};
exports.GraphQLByte = new graphql_1.GraphQLScalarType(exports.GraphQLByteConfig);