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const parseString = require("xml2js").parseString;
const parsers = {};
/**
* Plain text parser for superagent
*
* @static
*
* @param {Object} res response from the HTTP server
* @param {Function} done fuunction which is done when all response is readed
*/
parsers["text/plain"] = function parsePlainText(res, done) {
res.text = "";
res.setEncoding("utf8");
res.on("data", function (chunk) {
res.text += chunk;
});
res.on("end", function () {
done(null, res.text);
});
};
/**
* XML parser for superagent
*
* @static
*
* @param {Object} res response from the HTTP server
* @param {Function} done fuunction which is done when all response is readed and parase
*/
parsers["application/xml"] = function parseXML(res, done) {
res.text = "";
res.setEncoding("utf8");
res.on("data", function (chunk) {
res.text += chunk;
});
res.on("end", function () {
parseString(res.text, function (err, output) {
if (err) {
done(err);
} else {
done(null, output);
}
});
});
};
/**
* HTML parser for superagent. Just collect text. HTML parseng by jsdom
* is postponed for performace issues
*
* @static
*
* @param {Object} res response from the HTTP server
* @param {Function} done fuunction which is done when all response is readed and parase
*/
parsers["text/html"] = function parseHTML(res, done) {
res.text = "";
res.setEncoding("utf8");
res.on("data", function (chunk) {
res.text += chunk;
});
res.on("end", function () {
done(null, res.text);
});
};
/**
* JSON parser for superagent. Just collect text and parse
* JSON when all response is received
*
* @static
*
* @param {Object} res response from the HTTP server
* @param {Function} done fuunction which is done when all response is readed and parase
*/
parsers["application/json"] = function parseJSON(res, done) {
res.text = "";
res.setEncoding("utf8");
res.on("data", (chunk) => {
res.text += chunk;
});
res.on("end", () => {
let body;
let err;
try {
body = res.text && JSON.parse(res.text);
} catch (e) {
err = e;
err.rawResponse = res.text || null;
err.statusCode = res.statusCode;
} finally {
done(err, body);
}
});
};
/**
* JSON parser for superagent. Just collect text and parse
* JSON when all response is received
*
* @static
*
* @param {Object} res response from the HTTP server
* @param {Function} done fuunction which is done when all response is readed and parase
*/
function parseBinary(res, done) {
let binaryBuffer = Buffer.alloc(0);
res.on("data", (chunk) => {
binaryBuffer = Buffer.concat([binaryBuffer, chunk]);
});
res.on("end", () => {
done(null, binaryBuffer);
});
}
parsers["application/pdf"] = parseBinary;
parsers["application/vnd.ms-excel"] = parseBinary;
parsers["application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"] =
parseBinary;
/**
* Parse response from count. Raises error for invalid
* number in body
*
* @param {String} responseText response
*
* @return {Number} returns
*
* @memberof QueryableResource
*/
parsers.count = function (responseText) {
const count = parseInt(responseText, 10);
if (isNaN(count)) {
throw new Error("Backend returns invalid count value.");
}
return count;
};
module.exports = parsers;
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