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use crate::models::FileEntry;
use anyhow::{Context, Result};
use reqwest::Client;
use std::{io::Write, path::Path};
use tokio::{
fs::{self, File},
io::AsyncWriteExt,
};
use zip::{CompressionMethod, ZipWriter, write::FileOptions};
/// Creates and writes container.xml.
fn write_container_xml_to_zip(zip: &mut ZipWriter<std::fs::File>, opf_full_path: &str) -> Result<()> {
// Prepare file contents.
let contents = format!(
r#"<?xml version="1.0" encoding="UTF-8"?>
<container version="1.0" xmlns="urn:oasis:names:tc:opendocument:xmlns:container">
<rootfiles>
<rootfile full-path="{opf_full_path}" media-type="application/oebps-package+xml"/>
</rootfiles>
</container>
"#
);
// Write down the file.
let options: FileOptions<()> =
FileOptions::default().compression_method(CompressionMethod::Deflated);
zip.start_file("META-INF/container.xml", options)?;
zip.write_all(contents.as_bytes())?;
Ok(())
}
pub async fn download_all_files(
client: &Client,
file_entries: &[FileEntry],
dest_root: &Path,
) -> Result<()> {
for entry in file_entries {
let dest_path = dest_root.join(&entry.full_path);
if let Some(parent_dir) = dest_path.parent() {
fs::create_dir_all(parent_dir).await?;
}
let mut file = File::create(dest_path).await?;
let bytes = client
.get(&entry.url)
.send()
.await?
.error_for_status()?
.bytes()
.await?;
file.write_all(&bytes).await?;
}
Ok(())
}
/// Creates the EPUB archive (creates zip and includes all files in it).
pub fn create_epub_archive(
epub_root: &Path,
output_epub: &Path,
file_entries: &[FileEntry],
) -> Result<()> {
let out_file = std::fs::File::create(output_epub)?;
let mut zip = ZipWriter::new(out_file);
// Write mimetype to zip first. It must be uncompressed.
let options: FileOptions<()> =
FileOptions::default().compression_method(CompressionMethod::Stored);
zip.start_file("mimetype", options)?;
zip.write_all(b"application/epub+zip")?;
// Find the OPF file entry to reference it in container.xml
let opf_entry = file_entries
.iter()
.find(|f| f.filename_ext == ".opf" && f.media_type == "application/oebps-package+xml")
.context("No OPF file with the correct MIME type was found.")?;
write_container_xml_to_zip(&mut zip, &opf_entry.full_path)?;
Ok(())
}
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