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use std::fs::{File, OpenOptions};
use std::io::{self, Read, Write};
use std::result;
use chrono::{DateTime, FixedOffset, Local, TimeZone};
use magic_crypt::{self, MagicCrypt};
use xdg;
use errors::*;
// Start timestamp on October 1 at 23h
// Trial should be valid until November 1 00h
const DAYS_REMAINING: u8 = 30;
const KEY: &'static str = "TODO SECRET";
/// Entry point to the trial handler.
fn do_trial() {
}
fn initialize_trial_start() -> Result<()> {
let encoded_time = encode_datetime(Local::now());
let xdg_dirs = xdg::BaseDirectories::with_prefix("dome-key")
.chain_err(|| "failed to get XDG base directories")?;
let trial_path = xdg_dirs.place_data_file(".trial")
.chain_err(|| "failed to get trial file path")?;
let mut trial_file = match OpenOptions::new()
.write(true)
.create_new(true)
.open(trial_path)
{
Ok(f) => Ok(f),
Err(ref e) if e.kind() == io::ErrorKind::AlreadyExists => return Ok(()),
Err(e) => Err(e),
}
.chain_err(|| "failed to create trial file")?;
write!(&mut trial_file, "{}", encoded_time)
.chain_err(|| "failed to write to trial file")?;
Ok(())
}
/// Decrypts the time string from the trial file and returns it as a
/// `DateTime`.
fn get_trial_start() -> Result<DateTime<FixedOffset>> {
let xdg_dirs = xdg::BaseDirectories::with_prefix("dome-key")
.chain_err(|| "failed to get XDG base directories")?;
let trial_path = xdg_dirs.place_data_file(".trial")
.chain_err(|| "failed to get trial file path")?;
let mut trial_file = File::open(trial_path)?;
let mut encoded_time = String::new();
trial_file.read_to_string(&mut encoded_time)?;
let trial_start = decode_datetime(&encoded_time)?;
Ok(trial_start)
}
fn print_trial_days(days: u8) {
}
fn days_remaining(
start: DateTime<Local>,
now: DateTime<Local>,
days_available: u8,
) -> result::Result<u8, DurationError> {
let duration = (now.date() - start.date()).num_days() as u8;
if duration > days_available {
Err(
DurationError::NegativeDuration(days_available as i32 - duration as i32)
)
} else {
Ok(days_available - duration)
}
}
fn days_remaining_from_now(
start: DateTime<Local>
) -> result::Result<u8, DurationError> {
days_remaining(start, Local::now(), DAYS_REMAINING)
}
fn encode_datetime(d: DateTime<Local>) -> String {
let iv = initialization_vector();
let mut mc = MagicCrypt::new(KEY, magic_crypt::SecureBit::Bit64, Some(&iv));
let timestamp = mc.encrypt_str_to_base64(&d.to_rfc3339());
format!("{}//{}", timestamp, iv)
}
fn decode_datetime(
s: &str
) -> result::Result<DateTime<FixedOffset>, DateCryptError> {
let encrypted: Vec<_> = s.rsplitn(2, "//").collect();
let timestamp = encrypted[0];
let iv = encrypted[1];
let mut mc = MagicCrypt::new(KEY, magic_crypt::SecureBit::Bit64, Some(&iv));
let timestamp = mc.decrypt_base64_to_string(×tamp)?;
let timestamp = DateTime::parse_from_rfc3339(×tamp)?;
Ok(timestamp)
}
fn initialization_vector() -> String {
// Multiplied by 2 for no good reason other than to make the value
// different from the actual timestamp.
(Local::now().timestamp_millis() * 2).to_string()
}
// initialize_trial_start
// encode_datetime
// check_days_remaining
// days_remaining_from_now
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn days_remaining_counts_days_remaining_from_start_date() {
let remaining = days_remaining(
Local.ymd(2018, 10, 1).and_hms(23, 1, 0),
Local.ymd(2018, 10, 1).and_hms(23, 30, 0),
30,
);
assert_eq!(remaining, Ok(30));
}
#[test]
fn days_remaining_with_middle_date() {
let remaining = days_remaining(
Local.ymd(2018, 10, 1).and_hms(23, 1, 0),
Local.ymd(2018, 10, 22).and_hms(15, 0, 0),
30,
);
assert_eq!(remaining, Ok(9));
}
#[test]
fn days_remaining_on_last_day_is_0() {
let remaining = days_remaining(
Local.ymd(2018, 10, 1).and_hms(23, 1, 0),
Local.ymd(2018, 10, 31).and_hms(23, 30, 0),
30,
);
assert_eq!(remaining, Ok(0));
}
#[test]
fn days_remaining_on_day_following_last_day_is_negative_duration_error() {
let remaining = days_remaining(
Local.ymd(2018, 10, 1).and_hms(23, 1, 0),
Local.ymd(2018, 11, 1).and_hms(0, 0, 0),
30,
);
assert_eq!(remaining, Err(DurationError::NegativeDuration(-1)));
}
#[test]
fn days_remaining_after_last_day_is_negative_duration_error() {
let remaining = days_remaining(
Local.ymd(2018, 10, 1).and_hms(23, 1, 0),
Local.ymd(2018, 11, 5).and_hms(0, 0, 0),
30,
);
assert_eq!(remaining, Err(DurationError::NegativeDuration(-5)));
}
}
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