flow like the river

BACK_BACK/node_modules/express-graphql/parseBody.js

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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}".`);
+}