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// Credit: https://github.com/sindilevich/connection-string-parser
/**
* @typedef {Object} ConnectionStringParserOptions
* @property {'mssql' | 'mysql' | 'postgresql' | 'db'} [scheme] - The scheme of the connection string
*/
/**
* @typedef {Object} ConnectionStringObject
* @property {string} scheme - The scheme of the connection string eg: mongodb, mssql, mysql, postgresql, etc.
* @property {string} username - The username of the connection string
* @property {string} password - The password of the connection string
* @property {{host: string, port: number}[]} hosts - The hosts of the connection string
* @property {string} endpoint - The endpoint (database name) of the connection string
* @property {Object} options - The options of the connection string
*/
class ConnectionStringParser {
static DEFAULT_SCHEME = "db";
/**
* @param {ConnectionStringParserOptions} options
*/
constructor(options = {}) {
this.scheme =
(options && options.scheme) || ConnectionStringParser.DEFAULT_SCHEME;
}
/**
* Takes a connection string object and returns a URI string of the form:
*
* scheme://[username[:password]@]host1[:port1][,host2[:port2],...[,hostN[:portN]]][/[endpoint]][?options]
* @param {Object} connectionStringObject The object that describes connection string parameters
*/
format(connectionStringObject) {
if (!connectionStringObject) {
return this.scheme + "://localhost";
}
if (
this.scheme &&
connectionStringObject.scheme &&
this.scheme !== connectionStringObject.scheme
) {
throw new Error(`Scheme not supported: ${connectionStringObject.scheme}`);
}
let uri =
(this.scheme ||
connectionStringObject.scheme ||
ConnectionStringParser.DEFAULT_SCHEME) + "://";
if (connectionStringObject.username) {
uri += encodeURIComponent(connectionStringObject.username);
// Allow empty passwords
if (connectionStringObject.password) {
uri += ":" + encodeURIComponent(connectionStringObject.password);
}
uri += "@";
}
uri += this._formatAddress(connectionStringObject);
// Only put a slash when there is an endpoint
if (connectionStringObject.endpoint) {
uri += "/" + encodeURIComponent(connectionStringObject.endpoint);
}
if (
connectionStringObject.options &&
Object.keys(connectionStringObject.options).length > 0
) {
uri +=
"?" +
Object.keys(connectionStringObject.options)
.map(
(option) =>
encodeURIComponent(option) +
"=" +
encodeURIComponent(connectionStringObject.options[option])
)
.join("&");
}
return uri;
}
/**
* Where scheme and hosts will always be present. Other fields will only be present in the result if they were
* present in the input.
* @param {string} uri The connection string URI
* @returns {ConnectionStringObject} The connection string object
*/
parse(uri) {
const connectionStringParser = new RegExp(
"^\\s*" + // Optional whitespace padding at the beginning of the line
"([^:]+)://" + // Scheme (Group 1)
"(?:([^:@,/?=&]+)(?::([^:@,/?=&]+))?@)?" + // User (Group 2) and Password (Group 3)
"([^@/?=&]+)" + // Host address(es) (Group 4)
"(?:/([^:@,/?=&]+)?)?" + // Endpoint (Group 5)
"(?:\\?([^:@,/?]+)?)?" + // Options (Group 6)
"\\s*$", // Optional whitespace padding at the end of the line
"gi"
);
const connectionStringObject = {};
if (!uri.includes("://")) {
throw new Error(`No scheme found in URI ${uri}`);
}
const tokens = connectionStringParser.exec(uri);
if (Array.isArray(tokens)) {
connectionStringObject.scheme = tokens[1];
if (this.scheme && this.scheme !== connectionStringObject.scheme) {
throw new Error(`URI must start with '${this.scheme}://'`);
}
connectionStringObject.username = tokens[2]
? decodeURIComponent(tokens[2])
: tokens[2];
connectionStringObject.password = tokens[3]
? decodeURIComponent(tokens[3])
: tokens[3];
connectionStringObject.hosts = this._parseAddress(tokens[4]);
connectionStringObject.endpoint = tokens[5]
? decodeURIComponent(tokens[5])
: tokens[5];
connectionStringObject.options = tokens[6]
? this._parseOptions(tokens[6])
: tokens[6];
}
return connectionStringObject;
}
/**
* Formats the address portion of a connection string
* @param {Object} connectionStringObject The object that describes connection string parameters
*/
_formatAddress(connectionStringObject) {
return connectionStringObject.hosts
.map(
(address) =>
encodeURIComponent(address.host) +
(address.port
? ":" + encodeURIComponent(address.port.toString(10))
: "")
)
.join(",");
}
/**
* Parses an address
* @param {string} addresses The address(es) to process
*/
_parseAddress(addresses) {
return addresses.split(",").map((address) => {
const i = address.indexOf(":");
return i >= 0
? {
host: decodeURIComponent(address.substring(0, i)),
port: +address.substring(i + 1),
}
: { host: decodeURIComponent(address) };
});
}
/**
* Parses options
* @param {string} options The options to process
*/
_parseOptions(options) {
const result = {};
options.split("&").forEach((option) => {
const i = option.indexOf("=");
if (i >= 0) {
result[decodeURIComponent(option.substring(0, i))] = decodeURIComponent(
option.substring(i + 1)
);
}
});
return result;
}
}
module.exports = { ConnectionStringParser };
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