s3-wasi-http 0.2.1

Basic S3 client using WASI HTTP
Documentation 
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use chrono::{DateTime, Utc};

/// Set conditional headers on a request
///
/// see [super::S3RequestBuilder::set_conditional_headers]
#[derive(Default)]
pub struct ConditionalHeaders {
    if_match: Option<String>,
    if_modified_since: Option<DateTime<Utc>>,
    if_none_match: Option<String>,
    if_unmodified_since: Option<DateTime<Utc>>,
}


impl ConditionalHeaders {
    pub fn if_match(&mut self, value: &str) -> &mut Self {
        self.if_match = Some(value.to_owned());
        self
    }

    pub fn if_modified_since(&mut self, datetime: DateTime<Utc>) -> &mut Self {
        self.if_modified_since = Some(datetime);
        self
    }

    pub fn if_none_match(&mut self, value: &str) -> &mut Self {
        self.if_none_match = Some(value.to_owned());
        self
    }

    pub fn if_unmodified_since(&mut self, datetime: DateTime<Utc>) -> &mut Self {
        self.if_unmodified_since = Some(datetime);
        self
    }

    pub(crate) fn get_headers(&self) -> Vec<(String, String)> {
        let mut headers = Vec::new();
        if let Some(value) = &self.if_match {
            headers.push(("If-Match".to_string(), value.to_owned()));
        }
        if let Some(datetime) = &self.if_modified_since {
            headers.push((
                "If-Modified-Since".to_string(),
                datetime.format("%A, %d %b %Y %H:%M:%S GMT").to_string(),
            ));
        }
        if let Some(value) = &self.if_none_match {
            headers.push(("If-None-Match".to_string(), value.to_owned()));
        }
        if let Some(datetime) = &self.if_unmodified_since {
            headers.push((
                "If-Unmodified-Since".to_string(),
                datetime.format("%A, %d %b %Y %H:%M:%S GMT").to_string(),
            ));
        }

        headers
    }
}