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use std::convert::TryFrom;
use thiserror::Error;
use time::{format_description::well_known::Iso8601, OffsetDateTime};
use crate::validation::{
FailureReason, Validate, ValidationContext, ValidationError, ValidationResult,
};
#[derive(Debug, PartialEq, Eq)]
pub struct DateTime(pub(crate) String);
impl DateTime {
pub fn now() -> Result<Self, DateTimeError> {
let now = OffsetDateTime::now_utc()
.format(&Iso8601::DEFAULT)
.map_err(|_| DateTimeError::FailedCurrentTime)?;
Ok(Self(now))
}
}
impl TryFrom<String> for DateTime {
type Error = DateTimeError;
fn try_from(value: String) -> Result<Self, Self::Error> {
match OffsetDateTime::parse(&value, &Iso8601::DEFAULT) {
Ok(_) => Ok(Self(value)),
Err(e) => Err(DateTimeError::InvalidDateTime(format!(
"DateTime does not conform to ISO 8601: {}",
e
))),
}
}
}
impl Validate for DateTime {
fn validate_with_context(
&self,
context: ValidationContext,
) -> Result<ValidationResult, ValidationError> {
match OffsetDateTime::parse(&self.0.to_string(), &Iso8601::DEFAULT) {
Ok(_) => Ok(ValidationResult::Passed),
Err(_) => Ok(ValidationResult::Failed {
reasons: vec![FailureReason {
message: "DateTime does not conform to ISO 8601".to_string(),
context,
}],
}),
}
}
}
impl ToString for DateTime {
fn to_string(&self) -> String {
self.0.clone()
}
}
#[derive(Debug, Error, PartialEq, Eq)]
pub enum DateTimeError {
#[error("Invalid DateTime: {}", .0)]
InvalidDateTime(String),
#[error("Failed to get current time")]
FailedCurrentTime,
}
#[cfg(test)]
mod test {
use super::*;
use crate::validation::FailureReason;
use pretty_assertions::assert_eq;
#[test]
fn valid_datetimes_should_pass_validation() {
let validation_result = DateTime("1969-06-28T01:20:00.00-04:00".to_string())
.validate_with_context(ValidationContext::default())
.expect("Error while validating");
assert_eq!(validation_result, ValidationResult::Passed)
}
#[test]
fn invalid_datetimes_should_fail_validation() {
let validation_result = DateTime("invalid date".to_string())
.validate_with_context(ValidationContext::default())
.expect("Error while validating");
assert_eq!(
validation_result,
ValidationResult::Failed {
reasons: vec![FailureReason {
message: "DateTime does not conform to ISO 8601".to_string(),
context: ValidationContext::default()
}]
}
)
}
}