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Add http and epub modules

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This commit is contained in:
Kenneth Gitere 2021-02-06 12:59:03 +03:00
parent 08f847531f
commit b402472ba6
5 changed files with 293 additions and 249 deletions
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57
src/cli.rs
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@ -1,7 +1,9 @@
use std::{fs::File, io::Read};
use clap::{App, AppSettings, Arg};
pub fn cli_init() -> App<'static, 'static> {
App::new("paperoni")
pub fn cli_init() -> AppConfig {
let app = App::new("paperoni")
.settings(&[
AppSettings::ArgRequiredElseHelp,
AppSettings::UnifiedHelpMessage,
@ -24,5 +26,54 @@ It takes a url and downloads the article content from it and saves it to an epub
.long("file")
.help("Input file containing links")
.takes_value(true),
)
);
let arg_matches = app.get_matches();
let mut urls: Vec<String> = match arg_matches.value_of("file") {
Some(file_name) => {
if let Ok(mut file) = File::open(file_name) {
let mut content = String::new();
match file.read_to_string(&mut content) {
Ok(_) => content
.lines()
.filter(|line| !line.is_empty())
.map(|line| line.to_owned())
.collect(),
Err(_) => vec![],
}
} else {
println!("Unable to open file: {}", file_name);
vec![]
}
}
None => vec![],
};
if let Some(vals) = arg_matches.values_of("urls") {
urls.extend(
vals.filter(|val| !val.is_empty())
.map(|val| val.to_string()),
);
}
let mut app_config = AppConfig::new();
app_config.set_urls(urls);
app_config
}
pub struct AppConfig {
urls: Vec<String>,
}
impl AppConfig {
fn new() -> Self {
Self { urls: vec![] }
}
fn set_urls(&mut self, urls: Vec<String>) {
self.urls.extend(urls);
}
pub fn urls(&self) -> &Vec<String> {
&self.urls
}
}

40
src/epub.rs Normal file
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@ -0,0 +1,40 @@
use std::fs::File;
use epub_builder::{EpubBuilder, EpubContent, ZipLibrary};
use crate::extractor::{self, Extractor};
pub fn generate_epub(extractor: Extractor) {
let file_name = format!(
"{}.epub",
extractor
.metadata()
.title()
.replace("/", " ")
.replace("\\", " ")
);
let mut out_file = File::create(&file_name).unwrap();
let mut html_buf = Vec::new();
extractor::serialize_to_xhtml(extractor.article().unwrap(), &mut html_buf)
.expect("Unable to serialize to xhtml");
let html_buf = std::str::from_utf8(&html_buf).unwrap();
let mut epub = EpubBuilder::new(ZipLibrary::new().unwrap()).unwrap();
if let Some(author) = extractor.metadata().byline() {
epub.metadata("author", author.replace("&", "&amp;"))
.unwrap();
}
epub.metadata("title", extractor.metadata().title().replace("&", "&amp;"))
.unwrap();
epub.add_content(EpubContent::new("index.xhtml", html_buf.as_bytes()))
.unwrap();
for img in extractor.img_urls {
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");
epub.add_resource(file_path.file_name().unwrap(), img_buf, img.1.unwrap())
.unwrap();
}
epub.generate(&mut out_file).unwrap();
println!("Created {:?}", file_name);
}

131
src/extractor.rs
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@ -1,10 +1,6 @@
use std::collections::HashMap;
use async_std::fs::File;
use async_std::io::prelude::*;
use async_std::task;
use kuchiki::{traits::*, NodeRef};
use url::Url;
use crate::moz_readability::{MetaData, Readability};
@ -51,8 +47,8 @@ impl Extractor {
}
/// Traverses the DOM tree of the content and retrieves the IMG URLs
fn extract_img_urls(&mut self) {
if let Some(content_ref) = &self.readability.article_node {
pub fn extract_img_urls(&mut self) {
if let Some(content_ref) = &self.article {
for img_ref in content_ref.select("img").unwrap() {
img_ref.as_node().as_element().map(|img_elem| {
img_elem.attributes.borrow().get("src").map(|img_url| {
@ -65,80 +61,6 @@ impl Extractor {
}
}
pub async fn download_images(&mut self, article_origin: &Url) -> async_std::io::Result<()> {
let mut async_download_tasks = Vec::with_capacity(self.img_urls.len());
self.extract_img_urls();
if self.img_urls.len() > 0 {
println!("Downloading images...");
}
for img_url in &self.img_urls {
let img_url = img_url.0.clone();
let abs_url = get_absolute_url(&img_url, article_origin);
async_download_tasks.push(task::spawn(async move {
let mut img_response = surf::Client::new()
// The middleware has been temporarily commented out because it happens
// to affect downloading images when there is no redirecting
// .with(surf::middleware::Redirect::default())
.get(&abs_url)
.await
.expect("Unable to retrieve file");
let img_content: Vec<u8> = img_response.body_bytes().await.unwrap();
let img_mime = img_response
.content_type()
.map(|mime| mime.essence().to_string());
let img_ext = img_response
.content_type()
.map(|mime| map_mime_subtype_to_ext(mime.subtype()).to_string())
.unwrap();
let mut img_path = std::env::temp_dir();
img_path.push(format!("{}.{}", hash_url(&abs_url), &img_ext));
let mut img_file = File::create(&img_path)
.await
.expect("Unable to create file");
img_file
.write_all(&img_content)
.await
.expect("Unable to save to file");
(
img_url,
img_path
.file_name()
.map(|os_str_name| {
os_str_name
.to_str()
.expect("Unable to get image file name")
.to_string()
})
.unwrap(),
img_mime,
)
}));
}
self.img_urls.clear();
for async_task in async_download_tasks {
let (img_url, img_path, img_mime) = async_task.await;
// Update the image sources
let img_ref = self
.readability
.article_node
.as_mut()
.expect("Unable to get mutable ref")
.select_first(&format!("img[src='{}']", img_url))
.expect("Image node does not exist");
let mut img_node = img_ref.attributes.borrow_mut();
*img_node.get_mut("src").unwrap() = img_path.clone();
// srcset is removed because readers such as Foliate then fail to display
// the image already downloaded and stored in src
img_node.remove("srcset");
self.img_urls.push((img_path, img_mime));
}
Ok(())
}
pub fn article(&self) -> Option<&NodeRef> {
self.article.as_ref()
}
@ -148,40 +70,6 @@ impl Extractor {
}
}
/// Utility for hashing URLs. This is used to help store files locally with unique values
fn hash_url(url: &str) -> String {
format!("{:x}", md5::compute(url.as_bytes()))
}
/// Handles getting the extension from a given MIME subtype.
fn map_mime_subtype_to_ext(subtype: &str) -> &str {
if subtype == ("svg+xml") {
return "svg";
} else if subtype == "x-icon" {
"ico"
} else {
subtype
}
}
fn get_absolute_url(url: &str, request_url: &Url) -> String {
if Url::parse(url).is_ok() {
url.to_owned()
} else if url.starts_with("/") {
Url::parse(&format!(
"{}://{}",
request_url.scheme(),
request_url.host_str().unwrap()
))
.unwrap()
.join(url)
.unwrap()
.into_string()
} else {
request_url.join(url).unwrap().into_string()
}
}
/// Serializes a NodeRef to a string that is XHTML compatible
/// The only DOM nodes serialized are Text and Element nodes
pub fn serialize_to_xhtml<W: std::io::Write>(
@ -278,19 +166,4 @@ mod test {
extractor.img_urls
);
}
#[test]
fn test_map_mime_type_to_ext() {
let mime_subtypes = vec![
"apng", "bmp", "gif", "x-icon", "jpeg", "png", "svg+xml", "tiff", "webp",
];
let exts = mime_subtypes
.into_iter()
.map(|mime_type| map_mime_subtype_to_ext(mime_type))
.collect::<Vec<_>>();
assert_eq!(
vec!["apng", "bmp", "gif", "ico", "jpeg", "png", "svg", "tiff", "webp"],
exts
);
}
}

183
src/http.rs Normal file
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@ -0,0 +1,183 @@
use async_std::fs::File;
use async_std::io::prelude::*;
use async_std::task;
use url::Url;
use crate::extractor::Extractor;
type HTMLResource = (String, String);
pub async fn fetch_url(
url: &str,
) -> Result<HTMLResource, Box<dyn std::error::Error + Send + Sync>> {
let client = surf::Client::new();
println!("Fetching...");
let mut redirect_count: u8 = 0;
let base_url = Url::parse(&url)?;
let mut url = base_url.clone();
while redirect_count < 5 {
redirect_count += 1;
let req = surf::get(&url);
let mut res = client.send(req).await?;
if res.status().is_redirection() {
if let Some(location) = res.header(surf::http::headers::LOCATION) {
match Url::parse(location.last().as_str()) {
Ok(valid_url) => url = valid_url,
Err(e) => match e {
url::ParseError::RelativeUrlWithoutBase => {
url = base_url.join(location.last().as_str())?
}
e => return Err(e.into()),
},
};
}
} else if res.status().is_success() {
if let Some(mime) = res.content_type() {
if mime.essence() == "text/html" {
return Ok((url.to_string(), res.body_string().await?));
} else {
return Err(format!(
"Invalid HTTP response. Received {} instead of text/html",
mime.essence()
)
.into());
}
} else {
return Err("Unknown HTTP response".into());
}
} else {
return Err(format!("Request failed: HTTP {}", res.status()).into());
}
}
Err("Unable to fetch HTML".into())
}
pub async fn download_images(
extractor: &mut Extractor,
article_origin: &Url,
) -> async_std::io::Result<()> {
extractor.extract_img_urls();
let mut async_download_tasks = Vec::with_capacity(extractor.img_urls.len());
if extractor.img_urls.len() > 0 {
println!("Downloading images...");
}
for img_url in &extractor.img_urls {
let img_url = img_url.0.clone();
let abs_url = get_absolute_url(&img_url, article_origin);
async_download_tasks.push(task::spawn(async move {
let mut img_response = surf::Client::new()
// The middleware has been temporarily commented out because it happens
// to affect downloading images when there is no redirecting
// .with(surf::middleware::Redirect::default())
.get(&abs_url)
.await
.expect("Unable to retrieve file");
let img_content: Vec<u8> = img_response.body_bytes().await.unwrap();
let img_mime = img_response
.content_type()
.map(|mime| mime.essence().to_string());
let img_ext = img_response
.content_type()
.map(|mime| map_mime_subtype_to_ext(mime.subtype()).to_string())
.unwrap();
let mut img_path = std::env::temp_dir();
img_path.push(format!("{}.{}", hash_url(&abs_url), &img_ext));
let mut img_file = File::create(&img_path)
.await
.expect("Unable to create file");
img_file
.write_all(&img_content)
.await
.expect("Unable to save to file");
(
img_url,
img_path
.file_name()
.map(|os_str_name| {
os_str_name
.to_str()
.expect("Unable to get image file name")
.to_string()
})
.unwrap(),
img_mime,
)
}));
}
extractor.img_urls.clear();
for async_task in async_download_tasks {
let (img_url, img_path, img_mime) = async_task.await;
// Update the image sources
let img_ref = extractor
.article()
.as_mut()
.expect("Unable to get mutable ref")
.select_first(&format!("img[src='{}']", img_url))
.expect("Image node does not exist");
let mut img_node = img_ref.attributes.borrow_mut();
*img_node.get_mut("src").unwrap() = img_path.clone();
// srcset is removed because readers such as Foliate then fail to display
// the image already downloaded and stored in src
img_node.remove("srcset");
extractor.img_urls.push((img_path, img_mime));
}
Ok(())
}
/// Handles getting the extension from a given MIME subtype.
fn map_mime_subtype_to_ext(subtype: &str) -> &str {
if subtype == ("svg+xml") {
return "svg";
} else if subtype == "x-icon" {
"ico"
} else {
subtype
}
}
/// Utility for hashing URLs. This is used to help store files locally with unique values
fn hash_url(url: &str) -> String {
format!("{:x}", md5::compute(url.as_bytes()))
}
fn get_absolute_url(url: &str, request_url: &Url) -> String {
if Url::parse(url).is_ok() {
url.to_owned()
} else if url.starts_with("/") {
Url::parse(&format!(
"{}://{}",
request_url.scheme(),
request_url.host_str().unwrap()
))
.unwrap()
.join(url)
.unwrap()
.into_string()
} else {
request_url.join(url).unwrap().into_string()
}
}
#[cfg(test)]
mod test {
use super::*;
#[test]
fn test_map_mime_type_to_ext() {
let mime_subtypes = vec![
"apng", "bmp", "gif", "x-icon", "jpeg", "png", "svg+xml", "tiff", "webp",
];
let exts = mime_subtypes
.into_iter()
.map(|mime_type| map_mime_subtype_to_ext(mime_type))
.collect::<Vec<_>>();
assert_eq!(
vec!["apng", "bmp", "gif", "ico", "jpeg", "png", "svg", "tiff", "webp"],
exts
);
}
}

131
src/main.rs
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@ -1,96 +1,27 @@
#[macro_use]
extern crate lazy_static;
use std::{fs::File, io::Read};
use async_std::task;
use epub_builder::{EpubBuilder, EpubContent, ZipLibrary};
use url::Url;
mod cli;
mod epub;
mod extractor;
/// This module is responsible for async HTTP calls for downloading
/// the HTML content and images
mod http;
mod moz_readability;
use epub::generate_epub;
use http::{download_images, fetch_url};
use extractor::Extractor;
fn main() {
let app = cli::cli_init();
let arg_matches = app.get_matches();
let mut urls: Vec<String> = match arg_matches.value_of("file") {
Some(file_name) => {
if let Ok(mut file) = File::open(file_name) {
let mut content = String::new();
match file.read_to_string(&mut content) {
Ok(_) => content
.lines()
.filter(|line| !line.is_empty())
.map(|line| line.to_owned())
.collect(),
Err(_) => vec![],
}
} else {
println!("Unable to open file: {}", file_name);
vec![]
}
}
None => vec![],
};
let app_config = cli::cli_init();
if let Some(vals) = arg_matches.values_of("urls") {
urls.extend(
vals.filter(|val| !val.is_empty())
.map(|val| val.to_string()),
);
if !app_config.urls().is_empty() {
download(app_config.urls().clone());
}
if !urls.is_empty() {
download(urls);
}
}
type HTMLResource = (String, String);
async fn fetch_url(url: &str) -> Result<HTMLResource, Box<dyn std::error::Error + Send + Sync>> {
let client = surf::Client::new();
println!("Fetching...");
let mut redirect_count: u8 = 0;
let base_url = Url::parse(&url)?;
let mut url = base_url.clone();
while redirect_count < 5 {
redirect_count += 1;
let req = surf::get(&url);
let mut res = client.send(req).await?;
if res.status().is_redirection() {
if let Some(location) = res.header(surf::http::headers::LOCATION) {
match Url::parse(location.last().as_str()) {
Ok(valid_url) => url = valid_url,
Err(e) => match e {
url::ParseError::RelativeUrlWithoutBase => {
url = base_url.join(location.last().as_str())?
}
e => return Err(e.into()),
},
};
}
} else if res.status().is_success() {
if let Some(mime) = res.content_type() {
if mime.essence() == "text/html" {
return Ok((url.to_string(), res.body_string().await?));
} else {
return Err(format!(
"Invalid HTTP response. Received {} instead of text/html",
mime.essence()
)
.into());
}
} else {
return Err("Unknown HTTP response".into());
}
} else {
return Err(format!("Request failed: HTTP {}", res.status()).into());
}
}
Err("Unable to fetch HTML".into())
}
fn download(urls: Vec<String>) {
@ -98,6 +29,7 @@ fn download(urls: Vec<String>) {
for url in urls {
async_url_tasks.push(task::spawn(async move { fetch_url(&url).await }));
}
task::block_on(async {
for url_task in async_url_tasks {
match url_task.await {
@ -105,47 +37,12 @@ fn download(urls: Vec<String>) {
println!("Extracting");
let mut extractor = Extractor::from_html(&html);
extractor.extract_content(&url);
if extractor.article().is_some() {
extractor
.download_images(&Url::parse(&url).unwrap())
download_images(&mut extractor, &Url::parse(&url).unwrap())
.await
.expect("Unable to download images");
let file_name = format!(
"{}.epub",
extractor
.metadata()
.title()
.replace("/", " ")
.replace("\\", " ")
);
let mut out_file = File::create(&file_name).unwrap();
let mut html_buf = Vec::new();
extractor::serialize_to_xhtml(extractor.article().unwrap(), &mut html_buf)
.expect("Unable to serialize to xhtml");
let html_buf = std::str::from_utf8(&html_buf).unwrap();
let mut epub = EpubBuilder::new(ZipLibrary::new().unwrap()).unwrap();
if let Some(author) = extractor.metadata().byline() {
epub.metadata("author", author.replace("&", "&amp;"))
.unwrap();
}
epub.metadata("title", extractor.metadata().title().replace("&", "&amp;"))
.unwrap();
epub.add_content(EpubContent::new("index.xhtml", html_buf.as_bytes()))
.unwrap();
for img in extractor.img_urls {
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");
epub.add_resource(
file_path.file_name().unwrap(),
img_buf,
img.1.unwrap(),
)
.unwrap();
}
epub.generate(&mut out_file).unwrap();
println!("Created {:?}", file_name);
generate_epub(extractor);
}
}
Err(e) => println!("{}", e),