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const EventEmitter = require("events");
const _ = require("lodash");
const HTTPParser = require("http-parser-js").HTTPParser;
const parsers = require("../parsers");
const Headers = require("./Headers");
const responseType = require("../../engine/responseType");
/**
* Response class implements OData particular response
*
* @public
* @class Response
*/
class Response extends EventEmitter {
/**
* Initialize instance of the batch Response class
*
* @param {Array} rawResponse particular response content from whole batch mulitpart/mime response (lines are array items)
*
* @public
* @memberof Response
*/
constructor(rawResponse) {
let resolveResponse;
let rejectResponse;
super();
Object.defineProperty(this, "promise", {
value: new Promise(function (resolve, reject) {
resolveResponse = resolve;
rejectResponse = reject;
}),
writable: false,
});
Object.defineProperty(this, "resolve", {
value: resolveResponse,
writable: false,
});
Object.defineProperty(this, "reject", {
value: rejectResponse,
writable: false,
});
this.process(rawResponse);
}
/**
* Parse and resolve/reject Response.promise
*
* @param {Array} rawResponse particular response content from whole batch mulitpart/mime response (lines are array items)
*
* @returns {Object} initialized parser (for testing usage)
*
* @private
* @memberof Response
*/
process(rawResponse) {
this.body = null;
_.each(
this.parseDivideResponse(rawResponse),
(responseRawValue, responseRawKey) => {
this[responseRawKey] = responseRawValue;
}
);
let parser = new HTTPParser(HTTPParser.RESPONSE);
let error;
try {
parser.onHeadersComplete = this.handlerHeadersComplete.bind(this);
parser.onBody = this.handlerBody.bind(this);
parser.onMessageComplete = this.handlerMessageComplete.bind(this);
parser.execute(
Buffer.from(
_.chain(this.rawHTTPResponse)
.filter((header) => !header.match(/content-length/i))
.join("\n")
.value(),
"binary"
)
);
parser.finish();
if (parser.state === "HEADER") {
this.processHeaderInfo(parser.info);
this.finishProcessResponse(parser.info.statusCode);
}
} catch (ex) {
error = new Error("Unexpected error thrown for response parsing.");
error.response = this;
this.reject(error);
}
return parser;
}
/**
* Divide rawResponse to part for MIME content and part of HTTP content
*
* @param {Array} rawResponse particular response content from whole batch mulitpart/mime response (lines are array items)
*
* @returns {Object} object with "rawHTTPResponse" key and "rawMIMEHeaders" key
*
* @private
* @memberof Response
*/
parseDivideResponse(rawResponse) {
let blocks = _.reduce(
rawResponse,
(acc, row) => {
if (row === "") {
acc.push([]);
} else {
acc[acc.length - 1].push(row);
}
return acc;
},
[[]]
);
return {
rawHTTPResponse: _.concat(blocks[1], "", blocks[2]),
rawMIMEHeaders: blocks[0],
};
}
/**
* Just for compatibility with NodeJS HTTP.Response object
*
* @private
* @memberof Response
*/
setEncoding() {}
/**
* Divide rawResponse to part for MIME content and part of HTTP content
*
* @returns {String} content type of the particular batch HTTP response
*
* @see https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Type
*
* @private
* @memberof Response
*/
getContentType() {
let mediaTypeEnd;
let contentType = _.find(
this.headers,
(headerValue, headerName) =>
_.isString(headerName) && headerName.toLowerCase() === "content-type"
);
if (_.isString(contentType)) {
mediaTypeEnd = contentType.indexOf(";");
contentType = contentType.substring(
0,
mediaTypeEnd < 0 ? contentType.length : mediaTypeEnd
);
} else {
contentType = null;
}
return contentType;
}
/**
* Determine parser for the current response
*
* @returns {Function} function which is compatible with superagent parser
*
* @see http://visionmedia.github.io/superagent/#parsing-response-bodies
*
* @private
* @memberof Response
*/
getBodyParser() {
return parsers[this.getContentType()];
}
/**
* Handler which is called after the body parsing is done
*
* @param {Error} err is error object raised during body parsing
* @param {Any} content parsed content
*
* @private
* @memberof Response
*/
handlerParserFinished(err, content) {
if (err) {
this.resolve(err);
} else {
this.body = content;
this.finishProcessResponse(
this.statusCode,
JSON.stringify(content, null, 2)
);
}
}
/**
* Helper function which sets correct parser after the headers are
* loaded and parsed
*
* Use by handlerHeadersComplete method
*
* @param {Function} bodyParser is function function which is compatible with superagent parser
*
* @see http://visionmedia.github.io/superagent/#parsing-response-bodies
*
* @private
* @memberof Response
*/
useBodyParser(bodyParser) {
if (bodyParser) {
bodyParser(this, this.handlerParserFinished.bind(this));
} else {
this.on("end", this.handlerParserFinished.bind(this));
}
}
/**
* Handler called when headers are received. Parse headers and set correct body
* parser.
*
* @param {Object} headersInfo object with "headers" key which contains array
* of headers. The headers are set as rawHeaders to the Response object
* parsed headers are accessible as headers object
*
* @see http://visionmedia.github.io/superagent/#parsing-response-bodies
*
* @private
* @memberof Response
*/
handlerHeadersComplete(headersInfo) {
this.processHeaderInfo(headersInfo);
this.useBodyParser(this.getBodyParser());
}
/**
* Append parsed headers to the batch response instance
*
* @param {Object} headersInfo object with "headers" key which contains array
* of headers. The headers are set as rawHeaders to the Response object
* parsed headers are accessible as headers object
*
* @see http://visionmedia.github.io/superagent/#parsing-response-bodies
*
* @private
* @memberof Response
*/
processHeaderInfo(headersInfo) {
_.each(headersInfo, (headerInfoValue, headerInfoKey) => {
this[headerInfoKey] = headerInfoValue;
});
this.rawHeaders = this.headers;
this.headers = new Headers(this.rawHeaders);
}
/**
* Fire event "data" after the new data are recevied
*
* @param {Buffer} data buffet with body of the HTTP response
* @param {Number} offset offset of currently received data
* @param {Number} len length of currently received data
*
* @private
* @memberof Response
*/
handlerBody(data, offset, len) {
this.emit("data", data.toString("binary", offset, offset + len));
}
/**
* Fire event "end" when response is fully received and parsed
*
* @private
* @memberof Response
*/
handlerMessageComplete() {
this.emit("end");
}
/**
* Finish response processing
*
* @param {Number} statusCode HTTP status code from raw response
* @param {String} errorMessage response
*
* @private
* @memberof Response
*/
finishProcessResponse(statusCode, errorMessage) {
let message;
let error;
if (statusCode < 400) {
this.resolve(this);
} else {
message = `${statusCode} - Invalid response inside Batch.`;
if (_.isString(errorMessage)) {
message += `\n${errorMessage}`;
}
error = new Error(message);
error.response = this;
this.resolve(error);
}
}
/**
* Read plain OData response as javascript object from
* Batch response
*
* @public
*
* @param {String} listResultPath path to list result (depends on OData version)
* @param {String} instanceResultPath path to entity result (depends on OData version)
*
* @returns {Array|Object} parsed list or entity
*
* @memberof agent/batch/Response
*/
plain(listResultPath, instanceResultPath) {
let result;
switch (this.request.responseType) {
case responseType.COUNT:
result = parsers.count(_.get(this, "body"));
break;
case responseType.LIST:
result = _.get(this, `body.${listResultPath}`);
break;
case responseType.ENTITY:
result = _.get(this, `body.${instanceResultPath}`, null);
break;
}
return result || this;
}
/**
* It is mimicry for Fetch API Response json method
*
* @returns {Promise} promise resolved by body as json format
*/
json() {
return Promise.resolve(this.body);
}
}
module.exports = Response;
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