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use std::{
convert::{TryFrom, TryInto},
str::FromStr,
};
use chrono::{DateTime, Utc};
use rand::Rng;
#[derive(Clone, Copy, Ord, PartialOrd, Eq, PartialEq, Serialize, Deserialize, Debug, Hash)]
pub struct Pin(u32);
impl From<Pin> for u32 {
fn from(pin: Pin) -> Self {
pin.0
}
}
impl TryFrom<u32> for Pin {
type Error = ();
fn try_from(value: u32) -> Result<Self, Self::Error> {
if !(100_000_000..=999_999_999).contains(&value) {
return Err(());
}
Ok(Pin(value))
}
}
impl FromStr for Pin {
type Err = ();
fn from_str(s: &str) -> Result<Self, Self::Err> {
let pin_int: u32 = s
.replace(|c: char| c.is_whitespace(), "")
.parse()
.map_err(|_| ())?;
Pin::try_from(pin_int)
}
}
impl Pin {
pub fn generate() -> Pin {
let mut rng = rand::thread_rng();
rng.gen_range(100_000_000..999_999_999).try_into().unwrap()
}
pub fn to_formatted_string(self) -> String {
let id = self.0;
let three = id - (id / 1_000) * 1_000;
let one = id / 1_000_000;
let two = (id - one * 1_000_000 - three) / 1_000;
format!("{:03} {:03} {:03}", one, two, three)
}
}
#[derive(Serialize, Deserialize)]
pub struct CreatePayloadRequest {
pub data: String,
pub expect_reply: bool,
}
pub type ReplyToken = u64;
#[derive(Serialize, Deserialize)]
pub struct CreatePayloadResponse {
pub pin: Pin,
pub expiration: DateTime<Utc>,
pub reply_pin: Option<Pin>,
}
#[derive(Serialize, Deserialize)]
pub struct ReplyPayloadRequest {
pub data: String,
pub reply_token: ReplyToken,
pub expect_reply: bool,
}
#[derive(Serialize, Deserialize)]
pub struct Payload {
pub pin: Pin,
pub(crate) data: String,
pub reply_pin: Option<Pin>,
pub reply_token: Option<ReplyToken>,
}
impl Payload {
pub fn decode_payload(&self) -> Result<Vec<u8>, PayloadError> {
let b64_payload = base64::decode(&self.data)?;
Ok(b64_payload)
}
}
#[derive(Debug, thiserror::Error)]
pub enum PayloadError {
#[error("Base64 decoding error: {0}")]
Decode(#[from] base64::DecodeError),
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn pin_validation() {
assert!(Pin::try_from(0).is_err());
assert!(Pin::try_from(99_999_999).is_err());
assert!(Pin::try_from(100_000_000).is_ok());
assert!(Pin::try_from(999_999_999).is_ok());
assert!(Pin::try_from(1_000_000_000).is_err());
}
#[test]
fn pin_formatting() {
assert_eq!(&Pin(123_456_789).to_formatted_string(), "123 456 789");
assert_eq!(&Pin(100_000_000).to_formatted_string(), "100 000 000");
assert_eq!(&Pin(999_999_999).to_formatted_string(), "999 999 999");
}
#[test]
fn pin_string_parsing() {
assert_eq!("123 456 789".parse().ok(), Some(Pin(123_456_789)));
assert_eq!("100 000 000".parse().ok(), Some(Pin(100_000_000)));
assert!("123".parse::<Pin>().is_err());
assert!("foo".parse::<Pin>().is_err());
assert_eq!(" 99 9 9 99 999 ".parse().ok(), Some(Pin(999_999_999)));
}
}