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"use strict";
var __importDefault = (this && this.__importDefault) || function (mod) {
return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.parseBody = void 0;
const zlib_1 = __importDefault(require("zlib"));
const querystring_1 = __importDefault(require("querystring"));
const raw_body_1 = __importDefault(require("raw-body"));
const http_errors_1 = __importDefault(require("http-errors"));
const content_type_1 = __importDefault(require("content-type"));
/**
* Provided a "Request" provided by express or connect (typically a node style
* HTTPClientRequest), Promise the body data contained.
*/
async function parseBody(req) {
const { body } = req;
// If express has already parsed a body as a keyed object, use it.
if (typeof body === 'object' && !(body instanceof Buffer)) {
return body;
}
// Skip requests without content types.
if (req.headers['content-type'] === undefined) {
return {};
}
const typeInfo = content_type_1.default.parse(req);
// If express has already parsed a body as a string, and the content-type
// was application/graphql, parse the string body.
if (typeof body === 'string' && typeInfo.type === 'application/graphql') {
return { query: body };
}
// Already parsed body we didn't recognise? Parse nothing.
if (body != null) {
return {};
}
const rawBody = await readBody(req, typeInfo);
// Use the correct body parser based on Content-Type header.
switch (typeInfo.type) {
case 'application/graphql':
return { query: rawBody };
case 'application/json':
if (jsonObjRegex.test(rawBody)) {
try {
return JSON.parse(rawBody);
}
catch (_a) {
// Do nothing
}
}
throw http_errors_1.default(400, 'POST body sent invalid JSON.');
case 'application/x-www-form-urlencoded':
return querystring_1.default.parse(rawBody);
}
// If no Content-Type header matches, parse nothing.
return {};
}
exports.parseBody = parseBody;
/**
* RegExp to match an Object-opening brace "{" as the first non-space
* in a string. Allowed whitespace is defined in RFC 7159:
*
* ' ' Space
* '\t' Horizontal tab
* '\n' Line feed or New line
* '\r' Carriage return
*/
const jsonObjRegex = /^[ \t\n\r]*\{/;
// Read and parse a request body.
async function readBody(req, typeInfo) {
var _a, _b;
const charset = (_b = (_a = typeInfo.parameters.charset) === null || _a === void 0 ? void 0 : _a.toLowerCase()) !== null && _b !== void 0 ? _b : 'utf-8';
// Assert charset encoding per JSON RFC 7159 sec 8.1
if (!charset.startsWith('utf-')) {
throw http_errors_1.default(415, `Unsupported charset "${charset.toUpperCase()}".`);
}
// Get content-encoding (e.g. gzip)
const contentEncoding = req.headers['content-encoding'];
const encoding = typeof contentEncoding === 'string'
? contentEncoding.toLowerCase()
: 'identity';
const length = encoding === 'identity' ? req.headers['content-length'] : null;
const limit = 100 * 1024; // 100kb
const stream = decompressed(req, encoding);
// Read body from stream.
try {
return await raw_body_1.default(stream, { encoding: charset, length, limit });
}
catch (rawError) {
const error = http_errors_1.default(400,
/* istanbul ignore next: Thrown by underlying library. */
rawError instanceof Error ? rawError : String(rawError));
error.message =
error.type === 'encoding.unsupported'
? `Unsupported charset "${charset.toUpperCase()}".`
: `Invalid body: ${error.message}.`;
throw error;
}
}
// Return a decompressed stream, given an encoding.
function decompressed(req, encoding) {
switch (encoding) {
case 'identity':
return req;
case 'deflate':
return req.pipe(zlib_1.default.createInflate());
case 'gzip':
return req.pipe(zlib_1.default.createGunzip());
}
throw http_errors_1.default(415, `Unsupported content-encoding "${encoding}".`);
}