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feat: add HTML exports with inlining of images

Browse source 
fix: typo fix
refactor: refactor `add_stylesheets` function
This commit is contained in:
Kenneth Gitere 2021-07-24 12:03:36 +03:00
parent d1d1a0f3f4
commit 2f4da824ba
10 changed files with 477 additions and 25 deletions
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3
.gitignore vendored
View file

@ -1,4 +1,7 @@
/target
*.epub
# Only ignore top level html files which may be made when testing
/*.html
*.pdf
*.log
.vscode/

1
Cargo.lock generated
View file

@ -1555,6 +1555,7 @@ name = "paperoni"
version = "0.5.0-alpha1"
dependencies = [
"async-std",
"base64",
"chrono",
"clap",
"colored",

3
Cargo.toml
View file

@ -14,8 +14,9 @@ readme = "README.md"
[dependencies]
# atty = "0.2.14"
async-std = "1.9.0"
base64 = "0.13.0"
chrono = "0.4.19"
clap = {version = "2.33.3", features = ["yaml"]}
clap = { version = "2.33.3", features = ["yaml"] }
colored = "2.0.0"
comfy-table = "3.0.0"
derive_builder = "0.10.2"

26
src/cli.rs
View file

@ -11,10 +11,10 @@ const DEFAULT_MAX_CONN: usize = 8;
#[derive(derive_builder::Builder)]
pub struct AppConfig {
/// Urls for store in epub
/// Article urls
pub urls: Vec<String>,
pub max_conn: usize,
/// Path to file of multiple articles into a single epub
/// Path to file of multiple articles into a single article
pub merged: Option<String>,
pub output_directory: Option<String>,
pub log_level: LogLevel,
@ -23,6 +23,8 @@ pub struct AppConfig {
pub is_logging_to_file: bool,
pub inline_toc: bool,
pub css_config: CSSConfig,
pub export_type: ExportType,
pub is_inlining_images: bool,
}
impl AppConfig {
@ -93,10 +95,11 @@ impl<'a> TryFrom<ArgMatches<'a>> for AppConfig {
None => DEFAULT_MAX_CONN,
})
.merged(arg_matches.value_of("output-name").map(|name| {
if name.ends_with(".epub") {
let file_ext = format!(".{}", arg_matches.value_of("export").unwrap());
if name.ends_with(&file_ext) {
name.to_owned()
} else {
name.to_string() + ".epub"
name.to_string() + &file_ext
}
}))
.can_disable_progress_bar(
@ -143,6 +146,15 @@ impl<'a> TryFrom<ArgMatches<'a>> for AppConfig {
_ => CSSConfig::All,
},
)
.export_type({
let export_type = arg_matches.value_of("export").unwrap();
if export_type == "html" {
ExportType::HTML
} else {
ExportType::EPUB
}
})
.is_inlining_images(arg_matches.is_present("inline-images"))
.try_init()
}
}
@ -162,3 +174,9 @@ pub enum CSSConfig {
NoHeaders,
None,
}
#[derive(Clone, Debug)]
pub enum ExportType {
HTML,
EPUB,
}

16
src/cli_config.yml
View file

@ -64,3 +64,19 @@ args:
conflicts_with: no-css
help: Removes the header CSS styling but preserves styling of images and codeblocks. To remove all the default CSS, use --no-css instead.
takes_value: false
- export:
long: export
help: Specify the file type of the export. The type must be in lower case.
possible_values: [html, epub]
value_name: type
takes_value: true
default_value: epub
- inline-images:
long: inline-images
help: Inlines the article images when exporting to HTML using base64. Pass --help to learn more.
long_help: "Inlines the article images when exporting to HTML using base64.
\nThis is used when you do not want a separate folder created for images during HTML export.
\nNOTE: It uses base64 encoding on the images which results in larger HTML export sizes as each image
increases in size by about 25%-33%."
takes_value: false
requires: export

26
src/epub.rs
View file

@ -12,7 +12,7 @@ use crate::{cli::AppConfig, errors::PaperoniError, extractor::Extractor};
lazy_static! {
static ref ESC_SEQ_REGEX: regex::Regex = regex::Regex::new(r#"(&|<|>|'|")"#).unwrap();
static ref VALID_ATTR_CHARS_REGEX: regex::Regex = regex::Regex::new(r#"[a-z0-9\-_]"#).unwrap();
static ref VALID_ATTR_CHARS_REGEX: regex::Regex = regex::Regex::new(r#"[a-z0-9\-_:]"#).unwrap();
}
pub fn generate_epubs(
@ -38,9 +38,6 @@ pub fn generate_epubs(
enabled_bar
};
let body_stylesheet = include_bytes!("./assets/body.min.css");
let header_stylesheet = include_bytes!("./assets/headers.min.css");
let mut errors: Vec<PaperoniError> = Vec::new();
match app_config.merged {
@ -73,7 +70,7 @@ pub fn generate_epubs(
epub.inline_toc();
}
match add_stylesheets(&mut epub, body_stylesheet, header_stylesheet, app_config) {
match add_stylesheets(&mut epub, app_config) {
Ok(_) => (),
Err(e) => {
error!("Unable to add stylesheets to epub file");
@ -148,6 +145,8 @@ pub fn generate_epubs(
let mut paperoni_err: PaperoniError = err.into();
paperoni_err.set_article_source(&name);
errors.push(paperoni_err);
error!("Failed to generate epub: {}", name);
bar.finish_with_message("epub generation failed\n");
return Err(errors);
}
}
@ -189,7 +188,7 @@ pub fn generate_epubs(
epub.metadata("author", replace_escaped_characters(author))?;
}
add_stylesheets(&mut epub, body_stylesheet, header_stylesheet, app_config)?;
add_stylesheets(&mut epub, app_config)?;
let title = replace_escaped_characters(article.metadata().title());
epub.metadata("title", &title)?;
@ -206,7 +205,7 @@ pub fn generate_epubs(
let mut file_path = std::env::temp_dir();
file_path.push(&img.0);
let img_buf = File::open(&file_path).expect("Can't read file");
let img_buf = File::open(&file_path).expect("Can't read image file");
epub.add_resource(
file_path.file_name().unwrap(),
img_buf,
@ -252,10 +251,10 @@ fn replace_escaped_characters(value: &str) -> String {
fn add_stylesheets<T: epub_builder::Zip>(
epub: &mut EpubBuilder<T>,
body_stylesheet: &[u8],
header_stylesheet: &[u8],
app_config: &AppConfig,
) -> Result<(), epub_builder::Error> {
let body_stylesheet: &[u8] = include_bytes!("./assets/body.min.css");
let header_stylesheet: &[u8] = include_bytes!("./assets/headers.min.css");
match app_config.css_config {
crate::cli::CSSConfig::All => {
epub.stylesheet([header_stylesheet, body_stylesheet].concat().as_bytes())?;
@ -434,6 +433,15 @@ fn serialize_to_xhtml<W: std::io::Write>(
node_ref: &NodeRef,
mut w: &mut W,
) -> Result<(), PaperoniError> {
{
// Add XHTML attributes
let html_elem = node_ref
.select_first("html")
.expect("Unable to get <html> element in article");
let mut html_attrs = html_elem.attributes.borrow_mut();
html_attrs.insert("xmlns", "http://www.w3.org/1999/xhtml".into());
html_attrs.insert("xmlns:epub", "http://www.idpf.org/2007/ops".into());
}
let mut escape_map = HashMap::new();
escape_map.insert("<", "&lt;");
escape_map.insert(">", "&gt;");

3
src/extractor.rs
View file

@ -30,7 +30,8 @@ impl Extractor {
self.readability.parse(&self.url)?;
if let Some(article_node_ref) = &self.readability.article_node {
let template = r#"
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:epub="http://www.idpf.org/2007/ops">
<!DOCTYPE html>
<html>
<head>
<link rel="stylesheet" href="stylesheet.css" type="text/css"></link>
</head>

391
src/html.rs Normal file
View file

@ -0,0 +1,391 @@
use std::{
collections::{BTreeMap, HashSet},
fs::{self, File},
path::Path,
};
use base64::encode;
use comfy_table::{Attribute, Cell, CellAlignment, Color, ContentArrangement, Table};
use html5ever::{LocalName, Namespace, QualName};
use indicatif::{ProgressBar, ProgressStyle};
use kuchiki::{traits::*, NodeRef};
use log::{debug, error, info};
use crate::{
cli::{self, AppConfig},
errors::PaperoniError,
extractor::Extractor,
moz_readability::MetaData,
};
const HEAD_ELEM_NOT_FOUND: &str =
"Unable to get <head> element to inline css. Ensure that the root node is the HTML document.";
const BASE_HTML_TEMPLATE: &str = r#"<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
</head>
<body></body>
</html>"#;
pub fn generate_html_exports(
articles: Vec<Extractor>,
app_config: &AppConfig,
successful_articles_table: &mut Table,
) -> Result<(), Vec<PaperoniError>> {
if articles.is_empty() {
return Ok(());
}
let bar = if app_config.can_disable_progress_bar {
ProgressBar::hidden()
} else {
let enabled_bar = ProgressBar::new(articles.len() as u64);
let style = ProgressStyle::default_bar().template(
"{spinner:.cyan} [{elapsed_precise}] {bar:40.white} {:>8} html {pos}/{len:7} {msg:.green}",
);
enabled_bar.set_style(style);
if !articles.is_empty() {
enabled_bar.set_message("Generating html files");
}
enabled_bar
};
let mut errors: Vec<PaperoniError> = Vec::new();
match app_config.merged {
Some(ref name) => {
successful_articles_table.set_header(vec![Cell::new("Table of Contents")
.add_attribute(Attribute::Bold)
.set_alignment(CellAlignment::Center)
.fg(Color::Green)]);
debug!("Creating {:?}", name);
let base_html_elem = kuchiki::parse_html().one(BASE_HTML_TEMPLATE);
let body_elem = base_html_elem.select_first("body").unwrap();
let base_path = Path::new(app_config.output_directory.as_deref().unwrap_or("."));
let img_dirs_path_name = name.trim_end_matches(".html");
let imgs_dir_path = base_path.join(img_dirs_path_name);
if !(app_config.is_inlining_images || imgs_dir_path.exists()) {
info!("Creating imgs dir in {:?} for {}", imgs_dir_path, name);
if let Err(e) = std::fs::create_dir(&imgs_dir_path) {
error!("Unable to create imgs dir for HTML file");
let err: PaperoniError = e.into();
errors.push(err);
return Err(errors);
};
}
for (idx, article) in articles.iter().enumerate() {
let article_elem = article
.article()
.select_first("div[id=\"readability-page-1\"]")
.unwrap();
let title = article.metadata().title();
let mut elem_attr = article_elem.attributes.borrow_mut();
if let Some(id_attr) = elem_attr.get_mut("id") {
*id_attr = format!("readability-page-{}", idx);
}
for (img_url, mime_type_opt) in &article.img_urls {
if app_config.is_inlining_images {
info!("Inlining images for {}", title);
let result = update_imgs_base64(
article,
img_url,
mime_type_opt.as_deref().unwrap_or("image/*"),
);
if let Err(e) = result {
let mut err: PaperoniError = e.into();
err.set_article_source(title);
error!("Unable to copy images to imgs dir for {}", title);
errors.push(err);
}
info!("Completed inlining images for {}", title);
} else {
info!("Copying images to imgs dir for {}", title);
let result = update_img_urls(article, &imgs_dir_path).map_err(|e| {
let mut err: PaperoniError = e.into();
err.set_article_source(title);
err
});
if let Err(e) = result {
error!("Unable to copy images to imgs dir for {}", title);
errors.push(e);
} else {
info!("Successfully copied images to imgs dir for {}", title);
}
}
}
bar.inc(1);
successful_articles_table.add_row(vec![title]);
body_elem.as_node().append(article_elem.as_node().clone());
debug!("Added {} to the export HTML file", title);
}
insert_title_elem(&base_html_elem, name);
insert_appendix(
&base_html_elem,
articles
.iter()
.map(|article| (article.metadata(), article.url.as_str()))
.collect(),
);
inline_css(&base_html_elem, app_config);
info!("Added title, footer and inlined styles for {}", name);
info!("Creating export HTML file: {}", name);
if let Err(mut err) = File::create(name)
.and_then(|mut out_file| base_html_elem.serialize(&mut out_file))
.map_err(|e| -> PaperoniError { e.into() })
{
error!("Failed to serialize articles to file: {}", name);
err.set_article_source(&name);
errors.push(err);
bar.finish_with_message("html generation failed");
return Err(errors);
};
bar.finish_with_message("Generated html file\n");
debug!("Created {:?}", name);
println!("Created {:?}", name);
}
None => {
successful_articles_table
.set_header(vec![Cell::new("Downloaded articles")
.add_attribute(Attribute::Bold)
.set_alignment(CellAlignment::Center)
.fg(Color::Green)])
.set_content_arrangement(ContentArrangement::Dynamic);
let mut file_names: HashSet<String> = HashSet::new();
for article in &articles {
let mut file_name = format!(
"{}/{}.html",
app_config.output_directory.as_deref().unwrap_or("."),
article
.metadata()
.title()
.replace("/", " ")
.replace("\\", " ")
);
if file_names.contains(&file_name) {
info!("Article name {:?} already exists", file_name);
file_name = format!(
"{}/{}_{}.html",
app_config.output_directory.as_deref().unwrap_or("."),
article
.metadata()
.title()
.replace("/", " ")
.replace("\\", " "),
file_names.len()
);
info!("Renamed to {:?}", file_name);
}
file_names.insert(file_name.clone());
debug!("Creating {:?}", file_name);
let export_article = || -> Result<(), PaperoniError> {
let mut out_file = File::create(&file_name)?;
if app_config.is_inlining_images {
for (img_url, mime_type_opt) in &article.img_urls {
update_imgs_base64(
article,
img_url,
mime_type_opt.as_deref().unwrap_or("image/*"),
)?
}
} else {
let base_path =
Path::new(app_config.output_directory.as_deref().unwrap_or("."));
let imgs_dir_name = article.metadata().title();
if !base_path.join(imgs_dir_name).exists() {
std::fs::create_dir(base_path.join(imgs_dir_name))?;
}
let imgs_dir_path = base_path.join(imgs_dir_name);
update_img_urls(article, &imgs_dir_path)?;
}
let utf8_encoding =
NodeRef::new_element(create_qualname("meta"), BTreeMap::new());
if let Some(elem_node) = utf8_encoding.as_element() {
let mut elem_attrs = elem_node.attributes.borrow_mut();
elem_attrs.insert("charset", "UTF-8".into());
}
if let Ok(head_elem) = article.article().select_first("head") {
let head_elem_node = head_elem.as_node();
head_elem_node.append(utf8_encoding);
};
insert_title_elem(article.article(), article.metadata().title());
insert_appendix(article.article(), vec![(article.metadata(), &article.url)]);
inline_css(article.article(), app_config);
article.article().serialize(&mut out_file)?;
Ok(())
};
if let Err(mut err) = export_article() {
err.set_article_source(&article.url);
errors.push(err);
}
debug!("Created {:?}", file_name);
bar.inc(1);
successful_articles_table.add_row(vec![article.metadata().title()]);
}
bar.finish_with_message("Generated HTML files\n");
}
}
if errors.is_empty() {
Ok(())
} else {
Err(errors)
}
}
fn create_qualname(name: &str) -> QualName {
QualName::new(
None,
Namespace::from("http://www.w3.org/1999/xhtml"),
LocalName::from(name),
)
}
/// Updates the src attribute of `<img>` elements with a base64 encoded string of the image data
fn update_imgs_base64(
article: &Extractor,
img_url: &str,
mime_type: &str,
) -> Result<(), std::io::Error> {
let temp_dir = std::env::temp_dir();
let img_path = temp_dir.join(img_url);
let img_bytes = std::fs::read(img_path)?;
let img_base64_str = format!("data:image:{};base64,{}", mime_type, encode(img_bytes));
let img_elems = article
.article()
.select(&format!("img[src=\"{}\"]", img_url))
.unwrap();
for img_elem in img_elems {
let mut img_attr = img_elem.attributes.borrow_mut();
if let Some(src_attr) = img_attr.get_mut("src") {
*src_attr = img_base64_str.clone();
}
}
Ok(())
}
/// Updates the src attribute of `<img>` elements to the new `imgs_dir_path` and copies the image to the new file location
fn update_img_urls(article: &Extractor, imgs_dir_path: &Path) -> Result<(), std::io::Error> {
let temp_dir = std::env::temp_dir();
for (img_url, _) in &article.img_urls {
let (from, to) = (temp_dir.join(img_url), imgs_dir_path.join(img_url));
info!("Copying {:?} to {:?}", from, to);
fs::copy(from, to)?;
let img_elems = article
.article()
.select(&format!("img[src=\"{}\"]", img_url))
.unwrap();
for img_elem in img_elems {
let mut img_attr = img_elem.attributes.borrow_mut();
if let Some(src_attr) = img_attr.get_mut("src") {
*src_attr = imgs_dir_path.join(img_url).to_str().unwrap().into();
}
}
}
Ok(())
}
/// Creates a `<title>` element in an HTML document with the value set to the article's title
fn insert_title_elem(root_node: &NodeRef, title: &str) {
let title_content = NodeRef::new_text(title);
let title_elem = NodeRef::new_element(create_qualname("title"), BTreeMap::new());
title_elem.append(title_content);
match root_node.select_first("head") {
Ok(head_elem) => {
head_elem.as_node().append(title_elem);
}
Err(_) => {
debug!("{}", HEAD_ELEM_NOT_FOUND);
let html_elem = root_node.select_first("html").unwrap();
let head_elem = NodeRef::new_element(create_qualname("head"), BTreeMap::new());
head_elem.append(title_elem);
html_elem.as_node().prepend(head_elem);
}
}
}
/// Creates the appendix in an HTML document where article sources are added in a `<footer>` element
fn insert_appendix(root_node: &NodeRef, article_links: Vec<(&MetaData, &str)>) {
let link_tags: String = article_links
.iter()
.map(|(meta_data, url)| {
let article_name = if !meta_data.title().is_empty() {
meta_data.title()
} else {
url
};
format!("<a href=\"{}\">{}</a><br></br>", url, article_name)
})
.collect();
let footer_inner_html = format!("<h2>Appendix</h2><h2>Article sources</h3>{}", link_tags);
let footer_elem =
kuchiki::parse_fragment(create_qualname("footer"), Vec::new()).one(footer_inner_html);
root_node.append(footer_elem);
}
/// Inlines the CSS stylesheets into the HTML article node
fn inline_css(root_node: &NodeRef, app_config: &AppConfig) {
let body_stylesheet = include_str!("./assets/body.min.css");
let header_stylesheet = include_str!("./assets/headers.min.css");
let mut css_str = String::new();
match app_config.css_config {
cli::CSSConfig::NoHeaders => {
css_str.push_str(body_stylesheet);
}
cli::CSSConfig::All => {
css_str.push_str(body_stylesheet);
css_str.push_str(header_stylesheet);
}
cli::CSSConfig::None => {
return;
}
}
let css_html_str = format!("<style>{}</style>", css_str);
let style_container =
kuchiki::parse_fragment(create_qualname("div"), Vec::new()).one(css_html_str);
let style_elem = style_container.select_first("style").unwrap();
match root_node.select_first("head") {
Ok(head_elem) => {
head_elem.as_node().prepend(style_elem.as_node().to_owned());
}
Err(_) => {
debug!("{}", HEAD_ELEM_NOT_FOUND);
let html_elem = root_node.select_first("html").unwrap();
let head_elem = NodeRef::new_element(create_qualname("head"), BTreeMap::new());
head_elem.prepend(style_elem.as_node().to_owned());
html_elem.as_node().prepend(head_elem);
}
}
// Remove the <link> of the stylesheet since styles are now inlined
if let Ok(style_link_elem) = root_node.select_first("link[href=\"stylesheet.css\"]") {
style_link_elem.as_node().detach();
};
}

4
src/logs.rs
View file

@ -11,7 +11,7 @@ use crate::errors::PaperoniError;
pub fn display_summary(
initial_article_count: usize,
succesful_articles_table: Table,
successful_articles_table: Table,
partial_downloads: Vec<PartialDownload>,
errors: Vec<PaperoniError>,
) {
@ -31,7 +31,7 @@ pub fn display_summary(
);
if successfully_downloaded_count > 0 {
println!("{}", succesful_articles_table);
println!("{}", successful_articles_table);
}
if partial_downloads_count > 0 {

21
src/main.rs
View file

@ -12,6 +12,7 @@ mod cli;
mod epub;
mod errors;
mod extractor;
mod html;
/// This module is responsible for async HTTP calls for downloading
/// the HTML content and images
mod http;
@ -20,6 +21,7 @@ mod moz_readability;
use cli::AppConfig;
use epub::generate_epubs;
use html::generate_html_exports;
use logs::display_summary;
fn main() {
@ -64,22 +66,33 @@ fn run(app_config: AppConfig) {
let articles = download(&app_config, &bar, &mut partial_downloads, &mut errors);
bar.finish_with_message("Downloaded articles");
let mut succesful_articles_table = Table::new();
succesful_articles_table
let mut successful_articles_table = Table::new();
successful_articles_table
.load_preset(UTF8_FULL)
.load_preset(UTF8_HORIZONTAL_BORDERS_ONLY)
.set_content_arrangement(ContentArrangement::Dynamic);
match generate_epubs(articles, &app_config, &mut succesful_articles_table) {
match app_config.export_type {
cli::ExportType::EPUB => {
match generate_epubs(articles, &app_config, &mut successful_articles_table) {
Ok(_) => (),
Err(gen_epub_errors) => {
errors.extend(gen_epub_errors);
}
};
}
cli::ExportType::HTML => {
match generate_html_exports(articles, &app_config, &mut successful_articles_table) {
Ok(_) => (),
Err(gen_html_errors) => errors.extend(gen_html_errors),
}
}
}
let has_errors = !errors.is_empty() || !partial_downloads.is_empty();
display_summary(
app_config.urls.len(),
succesful_articles_table,
successful_articles_table,
partial_downloads,
errors,
);