Function parseConnectionString

Extension/src/SSH/sshCommandToConfig.ts:228–260

* Parses the SSH connection address. This behaves like OpenSSH and for the * sake of parity (and simplicity) also emulates some of its quirks. * * The SSH source[1] is relatively simple. First, we try to parse the string as * a fully-qualified URI. The URL module helps with that. If that works a

(str: string)

 *  3. https://github.com/openssh/openssh-portable/blob/master///misc.c#L875-L877
 */
function parseConnectionString(str: string): { hostname: string; port?: string; username?: string } {
    let url: URL | undefined;
    try {
        url = new URL(str);
    } catch {
        // ignored
    }

    // It may seem a little odd, but the handling within OpenSSH is to fall
    // back to the splitting method (rather than erroring) if the wrong protocol
    // is provided. Do the same here for parity's sake.
    // https://github.com/openssh/openssh-portable/blob/e3b6c966b79c3ea5d51b923c3bbdc41e13b96ea0/misc.c#L854-L855
    if (url && url.protocol === 'ssh:') {
        return url;
    }

    // Manual splitting algorithm, augmented with the ability to remove the password:
    // https://github.com/openssh/openssh-portable/blob/e3b6c966b79c3ea5d51b923c3bbdc41e13b96ea0/ssh.c#L1016-L1030
    const hostDelimiter: number = str.lastIndexOf('@');
    if (hostDelimiter === -1) {
        return { hostname: str };
    }

    const hostname: string = str.slice(hostDelimiter + 1);
    let username: string = str.slice(0, hostDelimiter);

    const passwordDelimiter: number = username.indexOf(':');
    if (passwordDelimiter !== -1) {
        username = username.slice(0, passwordDelimiter);
    }

    return { hostname, username };
}