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use crate::error::DichroismError;
use crate::result::Result;
use base64::decode;
use image::imageops::FilterType;
use image::DynamicImage;
use image::GenericImageView;
use regex::Regex;
use std::path::PathBuf;
use uuid::Uuid;
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 data URI Regex.")
});
pub struct NewProductImageData {
original: DynamicImage, // original, just for safe-keeping
fullsize: DynamicImage, // full-size, "zoomed" view
base: DynamicImage, // basic viewing
thumbnail: DynamicImage, // tiny, square thumbnail
}
impl NewProductImageData {
pub fn from_data_uri(uri: &str) -> Result<Self> {
let data = DATA_URI_RE
.captures(uri)
.ok_or(DichroismError::UriDataExtract)?
.name("data")
.ok_or(DichroismError::UriDataExtract)?
.as_str();
let original = image::load_from_memory(&decode(data)?)?;
let fullsize = original.resize(1000, 1000, FilterType::Lanczos3);
let base = original.resize(640, 640, FilterType::Lanczos3);
let (width, height) = original.dimensions();
let thumbnail = if width > height {
let offset = (width - height) / 2;
original.crop_imm(offset, 0, width - offset * 2, height)
} else {
let offset = (height - width) / 2;
original.crop_imm(0, offset, width, height - offset * 2)
}
.resize(300, 300, FilterType::Lanczos3);
Ok(NewProductImageData {
original,
fullsize,
base,
thumbnail,
})
}
pub fn commit(self, prefix: &str) -> Result<NewProductImages> {
Ok(NewProductImages {
original: self.commit_single(prefix, &self.original)?,
fullsize: self.commit_single(prefix, &self.fullsize)?,
base: self.commit_single(prefix, &self.base)?,
thumbnail: self.commit_single(prefix, &self.thumbnail)?,
})
}
fn commit_single(&self, prefix: &str, image: &DynamicImage) -> Result<String> {
let base_name = Uuid::new_v3(&Uuid::NAMESPACE_OID, &image.to_bytes())
.to_hyphenated()
.to_string();
let mut path = PathBuf::new();
path.push(prefix);
path.push(base_name);
path.set_extension("jpg");
image.save(&path)?;
Ok(path.to_str().ok_or(DichroismError::ImageWrite)?.to_string())
}
}
pub struct NewProductImages {
original: String,
fullsize: String,
base: String,
thumbnail: String,
}
#[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_gen_product_images() {
NewProductImageData::from_data_uri(TEST_DATA_URI.trim())
.unwrap()
.commit(".")
.unwrap();
}
}
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