axum-image-endpoint 0.1.1

Image Endpoint to upload big images and receive rescaled ones
Documentation 
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use std::time::Duration;

#[derive(Debug, Clone)]
pub struct CacheControlValue {
    max_age: Option<Duration>,
    must_revalidate: Option<bool>,
    visibility: Option<CacheVisibility>,
}

impl CacheControlValue {
    pub fn new() -> Self {
        Self {
            max_age: None,
            must_revalidate: None,
            visibility: None,
        }
    }

    pub fn max_age(mut self, max_age: Duration) -> Self {
        self.max_age = Some(max_age);

        self
    }

    pub fn must_revalidate(mut self) -> Self {
        self.must_revalidate = Some(true);

        self
    }

    pub fn public(mut self) -> Self {
        self.visibility = Some(CacheVisibility::Public);

        self
    }

    #[allow(dead_code)]
    pub fn private(mut self) -> Self {
        self.visibility = Some(CacheVisibility::Private);

        self
    }
}

#[allow(clippy::to_string_trait_impl)]
impl ToString for CacheControlValue {
    fn to_string(&self) -> String {
        let mut v = Vec::new();

        if let Some(visibility) = &self.visibility {
            v.push(visibility.to_string());
        }

        if let Some(max_age) = &self.max_age {
            v.push(format!("max-age={}", max_age.as_secs()));
        }

        if let Some(true) = &self.must_revalidate {
            v.push("must-revalidate".to_string());
        }

        if v.is_empty() {
            v.push("no-cache".to_string());
        }

        let s = v.join(", ");

        s
    }
}

#[derive(Debug, Clone)]
pub enum CacheVisibility {
    Public,
    Private,
}

#[allow(clippy::to_string_trait_impl)]
impl ToString for CacheVisibility {
    fn to_string(&self) -> String {
        match self {
            CacheVisibility::Public => "public".to_string(),
            CacheVisibility::Private => "private".to_string(),
        }
    }
}

#[cfg(test)]
mod test {
    use std::time::Duration;

    use crate::cache_control::CacheControlValue;

    #[test]
    fn cache_control_correct_concat() {
        let cc = CacheControlValue::new().max_age(Duration::from_secs(1000));
        assert_eq!("max-age=1000", &cc.to_string());

        let cc = cc.must_revalidate();
        assert_eq!("max-age=1000, must-revalidate", &cc.to_string());

        let cc = cc.public();
        assert_eq!("public, max-age=1000, must-revalidate", &cc.to_string());

        let cc = cc.private();
        assert_eq!("private, max-age=1000, must-revalidate", &cc.to_string());
    }
}