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index.js
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index.js
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/** !
* koa-body-parser - index.js
* Copyright(c) 2014
* MIT Licensed
*
* Authors:
* dead_horse <[email protected]> (http://deadhorse.me)
* fengmk2 <[email protected]> (http://fengmk2.com)
*/
'use strict';
/**
* Module dependencies.
*/
const parse = require('co-body');
const copy = require('copy-to');
/**
* @param [Object] opts
* - {String} jsonLimit default '1mb'
* - {String} formLimit default '56kb'
* - {string} encoding default 'utf-8'
* - {Object} extendTypes
*/
module.exports = function(opts) {
opts = opts || {};
const {detectJSON} = opts;
const {onerror} = opts;
const enableTypes = opts.enableTypes || ['json', 'form'];
const enableForm = checkEnable(enableTypes, 'form');
const enableJson = checkEnable(enableTypes, 'json');
const enableText = checkEnable(enableTypes, 'text');
const enableXml = checkEnable(enableTypes, 'xml');
opts.detectJSON = undefined;
opts.onerror = undefined; // eslint-disable-line unicorn/prefer-add-event-listener
// force co-body return raw body
opts.returnRawBody = true;
// default json types
const jsonTypes = [
'application/json',
'application/json-patch+json',
'application/vnd.api+json',
'application/csp-report'
];
// default form types
const formTypes = ['application/x-www-form-urlencoded'];
// default text types
const textTypes = ['text/plain'];
// default xml types
const xmlTypes = ['text/xml', 'application/xml'];
const jsonOpts = formatOptions(opts, 'json');
const formOpts = formatOptions(opts, 'form');
const textOpts = formatOptions(opts, 'text');
const xmlOpts = formatOptions(opts, 'xml');
const extendTypes = opts.extendTypes || {};
extendType(jsonTypes, extendTypes.json);
extendType(formTypes, extendTypes.form);
extendType(textTypes, extendTypes.text);
extendType(xmlTypes, extendTypes.xml);
// eslint-disable-next-line func-names
return async function bodyParser(ctx, next) {
if (ctx.request.body !== undefined || ctx.disableBodyParser)
return await next(); // eslint-disable-line no-return-await
try {
const res = await parseBody(ctx);
ctx.request.body = 'parsed' in res ? res.parsed : {};
if (ctx.request.rawBody === undefined) ctx.request.rawBody = res.raw;
} catch (err) {
if (onerror) {
onerror(err, ctx);
} else {
throw err;
}
}
await next();
};
async function parseBody(ctx) {
if (
enableJson &&
((detectJSON && detectJSON(ctx)) || ctx.request.is(jsonTypes))
) {
return await parse.json(ctx, jsonOpts); // eslint-disable-line no-return-await
}
if (enableForm && ctx.request.is(formTypes)) {
return await parse.form(ctx, formOpts); // eslint-disable-line no-return-await
}
if (enableText && ctx.request.is(textTypes)) {
return (await parse.text(ctx, textOpts)) || '';
}
if (enableXml && ctx.request.is(xmlTypes)) {
return (await parse.text(ctx, xmlOpts)) || '';
}
return {};
}
};
function formatOptions(opts, type) {
const res = {};
copy(opts).to(res);
res.limit = opts[type + 'Limit'];
return res;
}
function extendType(original, extend) {
if (extend) {
if (!Array.isArray(extend)) {
extend = [extend];
}
extend.forEach(function(extend) {
original.push(extend);
});
}
}
function checkEnable(types, type) {
return types.includes(type);
}