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/*! * Port of body-parser (https://github.com/expressjs/body-parser) for Deno. * * Licensed as follows: * * (The MIT License) * * Copyright (c) 2014 Jonathan Ong <me@jongleberry.com> * Copyright (c) 2014-2015 Douglas Christopher Wilson <doug@somethingdoug.com> * * Permission is hereby granted, free of charge, to any person obtaining * a copy of this software and associated documentation files (the * 'Software'), to deal in the Software without restriction, including * without limitation the rights to use, copy, modify, merge, publish, * distribute, sublicense, and/or sell copies of the Software, and to * permit persons to whom the Software is furnished to do so, subject to * the following conditions: * * The above copyright notice and this permission notice shall be * included in all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND, * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. * */
import { hasBody } from "../../../deps.ts";import { createError } from "../../utils/createError.ts";import { read } from "./read.ts";import { getCharset } from "./getCharset.ts";import { typeChecker } from "./typeChecker.ts";import type { NextFunction, OpineRequest, OpineResponse } from "../../types.ts";
/** * RegExp to match the first non-space in a string. * * Allowed whitespace is defined in RFC 7159: * *    ws = *( *            %x20 /              ; Space *            %x09 /              ; Horizontal tab *            %x0A /              ; Line feed or New line *            %x0D )              ; Carriage return */
const FIRST_CHAR_REGEXP = /^[\x20\x09\x0a\x0d]*(.)/; // eslint-disable-line no-control-regex
/** * Create a middleware to parse JSON bodies. * * @param {object} [options] * @return {function} * @public */export function json(options: any = {}) {  const inflate = options.inflate !== false;  const reviver = options.reviver;  const strict = options.strict !== false;  const type = options.type || "application/json";  const verify = options.verify || false;
  if (verify !== false && typeof verify !== "function") {    throw new TypeError("option verify must be function");  }
  // create the appropriate type checking function  const shouldParse = typeof type !== "function" ? typeChecker(type) : type;
  function parse(buf: string) {    if (buf.length === 0) {      // special-case empty json body, as it's a common client-side mistake      return {};    }
    if (strict) {      const first = firstChar(buf);
      if (first !== "{" && first !== "[") {        throw createStrictSyntaxError(buf, first);      }    }
    try {      return JSON.parse(buf, reviver);    } catch (e) {      throw normalizeJsonSyntaxError(e, {        message: e.message,        stack: e.stack,      });    }  }
  return async function jsonParser(    req: OpineRequest,    res: OpineResponse,    next: NextFunction,  ) {    if (req._parsedBody) {      next();
      return;    }
    // skip requests without bodies    if (      !hasBody(req.headers) ||      parseInt(req.headers.get("content-length") || "") === 0    ) {      req.parsedBody = {};      next();
      return;    }
    // determine if request should be parsed    if (!shouldParse(req)) {      next();
      return;    }
    // assert charset per RFC 7159 sec 8.1    const charset = getCharset(req) || "utf-8";    if (charset.substr(0, 4) !== "utf-") {      next(        createError(          415,          'unsupported charset "' + charset.toUpperCase() + '"',        ),      );
      return;    }
    // read    await read(req, res, next, parse, {      encoding: charset,      inflate: inflate,      verify: verify,    });  };}
/** * Create strict violation syntax error matching native error. * * @param {string} str * @param {string} char * @return {Error} * @private */
function createStrictSyntaxError(str: string, char: string) {  const index = str.indexOf(char);  const partial = str.substring(0, index) + "#";
  try {    JSON.parse(partial); /* istanbul ignore next */    throw new SyntaxError("strict violation");  } catch (e) {    return normalizeJsonSyntaxError(e, {      message: e.message.replace("#", char),      stack: e.stack,    });  }}
/** * Get the first non-whitespace character in a string. * * @param {string} str * @return {function} * @private */function firstChar(str: string) {  return (FIRST_CHAR_REGEXP.exec(str) as any[])[1];}
/** * Normalize a SyntaxError for JSON.parse. * * @param {SyntaxError} error * @param {object} obj * @return {SyntaxError} */function normalizeJsonSyntaxError(error: any, obj: any) {  const keys = Object.getOwnPropertyNames(error);
  for (let i = 0; i < keys.length; i++) {    const key = keys[i];    if (key !== "stack" && key !== "message") {      delete error[key];    }  }
  // replace stack before message for Node.js 0.10 and below  error.stack = obj.stack.replace(error.message, obj.message);  error.message = obj.message;
  return error;}