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/**
* File system utilities.
* @module app/utils/file_utils
*/
import filesystem from "fs";
import parseCSV from "csv-parse";
import stringifyCSVCallback from "csv-stringify";
/**
* Helper function to load CSV from a file
* @param {string} inputFile path to the file
* @return {Promise} promise which will resolve with the parsed CSV
*/
const csvReadOptions = {
columns: true,
};
export const loadCSV = (inputFile, options = {}) =>
new Promise((resolve, reject) => {
if (!filesystem.existsSync(inputFile)) {
return reject("inputFile does not exist");
}
const csvOptions = {
...csvReadOptions,
...options,
};
filesystem.readFile(inputFile, "utf8", (error, text) => {
if (error) {
return reject(`Error reading file: ${error}`);
}
try {
parseCSV(text, csvOptions, function (err, data) {
if (err) {
return reject("Error parsing JSON");
}
resolve(data);
});
} catch {
reject("Error parsing JSON");
}
});
});
/**
* Helper function to stringify an array-of-arrays to a CSV (with Promise interface)
* @param {Array[]} rows array of arrays
* @return {Promise} promise which will resolve with the stringified CSV
*/
export const stringifyCSV = (rows) =>
new Promise((resolve, reject) => {
stringifyCSVCallback(rows, (error, output) => {
if (error) {
reject(error);
} else {
resolve(output);
}
});
});
/**
* Helper function to attempt to mitigate malicious CSV data
* @param {Array[]} rows array of arrays
* @return {Array[]} the sanitized input
*/
export const sanitizeCSV = (rows) =>
rows.map((row) =>
row.map((cell) => (cell && typeof cell === "string" ? "'" + cell : cell))
);
/**
* Helper function to load JSON from a file
* @param {string} inputFile path to the file
* @return {Promise} promise which will resolve with the parsed JSON
*/
export const loadJSON = (inputFile) =>
new Promise((resolve, reject) => {
if (!filesystem.existsSync(inputFile)) {
return reject("inputFile does not exist");
}
filesystem.readFile(inputFile, "utf8", (error, text) => {
if (error) {
return reject(`Error reading file: ${error}`);
}
try {
const data = JSON.parse(text);
resolve(data);
} catch {
reject("Error parsing JSON");
}
});
});
const writeFileOptions = {
replace: true,
};
/**
* Helper to write a string to a file
* @param {string} outputFile the file to write to
* @param {string|string[]} data the data to write
* @param {Object} options options, by default will overwrite the existing file
* @return {Promise} promise which will resolve when the file is saved
*/
export const writeFile = (outputFile, data, options = {}) => {
options = { ...writeFileOptions, ...options };
return new Promise((resolve, reject) => {
if (filesystem.existsSync(outputFile) && !options.replace) {
return reject("outputFile exists");
}
if (Array.isArray(data)) {
data = data.join("\n");
}
filesystem.writeFile(outputFile, data, { encoding: "utf8" }, (error) => {
if (error) {
return reject(`Error writing file: ${error}`);
}
resolve();
});
});
};
const writeJSONOptions = {
...writeFileOptions,
indent: true,
};
/**
* Helper to write JSON data to a file
* @param {string} outputFile the file to write to
* @param {Object} data the data to write
* @param {Object} options options, by default will overwrite the existing file
* @return {Promise} promise which will resolve when the file is saved
*/
export const writeJSON = (outputFile, data, options = {}) => {
options = { ...writeJSONOptions, ...options };
return new Promise((resolve, reject) => {
let json;
try {
if (options.indent) {
json = JSON.stringify(data, false, 2);
} else {
json = JSON.stringify(data);
}
} catch {
return reject("couldn't stringify JSON");
}
return writeFile(outputFile, json, options);
});
};
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