From 09b76f2bd136bfa41a0d13e698cc8c651ede0892 Mon Sep 17 00:00:00 2001
From: A Farzat <a@farzat.xyz>
Date: Tue, 3 Mar 2026 11:27:17 +0300
Subject: Add a function to write container.xml

---
 src/epub.rs | 26 ++++++++++++++++++++++++++
 src/main.rs |  3 ++-
 2 files changed, 28 insertions(+), 1 deletion(-)

(limited to 'src')

diff --git a/src/epub.rs b/src/epub.rs
index f216567..6f736de 100644
--- a/src/epub.rs
+++ b/src/epub.rs
@@ -7,6 +7,32 @@ use tokio::{
     io::AsyncWriteExt,
 };
 
+/// Creates and writes container.xml.
+pub async fn write_container_xml(dest_root: &Path, opf_full_path: &str) -> Result<()> {
+    // Create destination directory.
+    let dest_dir = dest_root.join("META-INF");
+    fs::create_dir_all(&dest_dir).await?;
+
+    // Create distination file.
+    let dest_path = dest_dir.join("container.xml");
+    let mut file = File::create(dest_path).await?;
+
+    // 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.
+    file.write_all(contents.as_bytes()).await?;
+    Ok(())
+}
+
 /// Creates and writes the mimetype. Assumes dest_root already exists.
 pub async fn write_mimetype(dest_root: &Path) -> Result<()> {
     let dest_path = dest_root.join("mimetype");
diff --git a/src/main.rs b/src/main.rs
index 6e9e6dd..6376315 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -5,7 +5,7 @@ mod models;
 use std::collections::HashMap;
 use std::path::Path;
 
-use crate::epub::{download_all_files, write_mimetype};
+use crate::epub::{download_all_files, write_container_xml, write_mimetype};
 use crate::http_client::build_authenticated_client;
 use crate::models::{Chapter, EpubResponse, FileEntry, Paginated, SpineItem, TocNode};
 use anyhow::{Context, Result, ensure};
@@ -122,6 +122,7 @@ async fn main() -> Result<()> {
     let dest_root = Path::new(&dest_root);
     download_all_files(&client, &file_entries, dest_root).await?;
     write_mimetype(dest_root).await?;
+    write_container_xml(dest_root, &opf_entry.full_path).await?;
 
     // Sanity check: Every entry in spine exists in chapters.
     let chapters: HashMap<String, Chapter> =
-- 
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