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use crate::error::DichroismError;
use crate::result::Result;
use base64::decode;
use regex::Regex;
use once_cell::sync::Lazy;
static DATA_URI_RE: Lazy<Regex> = Lazy::new(|| {
Regex::new("^data:image/(png|jpeg);base64,(?P<data>.+)").expect("Couldn't parse Regex.")
});
pub fn generate_images(data: &str) -> Result<()> {
let bytes = decode(data)?;
let img = image::load_from_memory(&bytes)?;
//img.save("test_full.jpg")?;
let _thumb = img.thumbnail(200, 200);
//thumb.save("test_thumbnail.jpg")?;
Ok(())
}
pub fn extract_data(uri: &str) -> Result<&str> {
let caps = DATA_URI_RE
.captures(uri)
.ok_or(DichroismError::UriDataExtract)?;
Ok(caps
.name("data")
.expect("Should never fail if regex succeeded.")
.as_str())
}
#[cfg(test)]
mod tests {
use super::*;
const TEST_DATA_URI: &str = include_str!("unit_test_data/img_data_uri.txt");
const TEST_DATA_BASE64: &str = include_str!("unit_test_data/test_data_base64.txt");
#[test]
fn test_generate_images() {
generate_images(TEST_DATA_BASE64.trim()).unwrap();
}
#[test]
fn test_extract_data() {
let base64_data = extract_data(TEST_DATA_URI).unwrap();
assert_eq!(TEST_DATA_BASE64.trim(), base64_data);
}
}
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