misc-mirrors/article_scraper
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embed images as base64 inside article html

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Jan Lukas Gernert 2019-03-06 18:37:24 +01:00
parent e1905d3c2c
commit 3ca59d7f02
3 changed files with 125 additions and 176 deletions
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3
Cargo.toml
View file

@ -14,6 +14,5 @@ encoding_rs = "0.8"
chrono = "0.4"
htmlescape = "0.3"
base64 = "0.10"
image = "0.20"
image = "0.21"
log = "0.4"
mime_guess = "1.8"

269
src/images/mod.rs
View file

@ -1,4 +1,3 @@
use std::path::PathBuf;
use reqwest;
use log::{
error,
@ -14,31 +13,25 @@ use self::error::{ImageDownloadError, ImageDownloadErrorKind};
use base64;
use std;
use image;
use mime_guess;
use super::ScraperErrorKind;
mod error;
pub struct ImageDownloader {
save_image_path: PathBuf,
client: reqwest::Client,
max_size: (u32, u32),
scale_size: (u32, u32),
}
impl ImageDownloader {
pub fn new(save_image_path: PathBuf, max_size: (u32, u32), scale_size: (u32, u32)) -> ImageDownloader {
pub fn new(max_size: (u32, u32)) -> ImageDownloader {
ImageDownloader {
save_image_path: save_image_path,
client: reqwest::Client::new(),
max_size: max_size,
scale_size: scale_size,
}
}
pub fn download_images_from_string(&self, html: &str, article_url: &url::Url) -> Result<String, ImageDownloadError> {
pub fn download_images_from_string(&self, html: &str) -> Result<String, ImageDownloadError> {
let parser = Parser::default_html();
let doc = parser.parse_string(html).map_err(|_| {
error!("Failed to parse HTML string");
@ -50,52 +43,29 @@ impl ImageDownloader {
ImageDownloadErrorKind::HtmlParse
})?;
self.download_images_from_context(&xpath_ctx, article_url)?;
self.download_images_from_context(&xpath_ctx)?;
Ok(doc.to_string(/*format:*/ false))
}
pub fn download_images_from_context(&self, context: &Context, article_url: &url::Url) -> Result<(), ImageDownloadError> {
pub fn download_images_from_context(&self, context: &Context) -> Result<(), ImageDownloadError> {
let xpath = "//img";
evaluate_xpath!(context, xpath, node_vec);
for mut node in node_vec {
if let Some(url) = node.get_property("src") {
let url = url::Url::parse(&url).context(ImageDownloadErrorKind::InvalidUrl)?;
let parent_url_result = match self.check_image_parent(&node, &url) {
let url = url::Url::parse(&url)
.context(ImageDownloadErrorKind::InvalidUrl)?;
let parent_url = match self.check_image_parent(&node, &url) {
Ok(url) => Some(url),
Err(_) => None,
};
if let Some(parent_url) = parent_url_result.clone() {
if let Ok(path) = self.save_image(&parent_url, article_url) {
if let Some(path) = path.to_str() {
if let Err(_) = node.set_property("parent_img", path) {
return Err(ImageDownloadErrorKind::HtmlParse)?;
}
}
}
let (small_image, big_image) = self.save_image(&url, &parent_url)?;
if let Err(_) = node.set_property("src", &small_image) {
return Err(ImageDownloadErrorKind::HtmlParse)?;
}
let mut img_path = self.save_image(&url, article_url)?;
if let Some((width, height)) = ImageDownloader::get_image_dimensions(&node) {
if width > self.max_size.0 || height > self.max_size.1 {
if let Ok(small_img_path) = ImageDownloader::scale_image(&img_path, self.scale_size.0, self.scale_size.1) {
if parent_url_result.is_none() {
if let Some(img_path) = img_path.to_str() {
if let Err(_) = node.set_property("big_img", img_path) {
return Err(ImageDownloadErrorKind::HtmlParse)?;
}
}
img_path = small_img_path;
}
}
}
}
if let Some(img_path) = img_path.to_str() {
if let Err(_) = node.set_property("src", img_path) {
if let Some(big_image) = big_image {
if let Err(_) = node.set_property("big-src", &big_image) {
return Err(ImageDownloadErrorKind::HtmlParse)?;
}
}
@ -105,35 +75,69 @@ impl ImageDownloader {
Ok(())
}
fn save_image(&self, image_url: &url::Url, article_url: &url::Url) -> Result<PathBuf, ImageDownloadError> {
fn save_image(&self, image_url: &url::Url, parent_url: &Option<url::Url>) -> Result<(String, Option<String>), ImageDownloadError> {
let mut response = self.client.get(image_url.clone()).send().map_err(|err| {
error!("GET {} failed - {}", image_url.as_str(), err.description());
err
}).context(ImageDownloadErrorKind::Http)?;
let content_type = ImageDownloader::check_image_content_type(&response)?;
let content_type_small = ImageDownloader::check_image_content_type(&response)?;
let content_type_small = content_type_small.to_str()
.context(ImageDownloadErrorKind::ContentType)?;
let mut content_type_big : Option<String> = None;
if let Some(host) = article_url.host_str() {
let folder_name = base64::encode(article_url.as_str()).replace("/", "_");
let path = self.save_image_path.join(host);
let path = path.join(folder_name);
let mut small_image : Vec<u8> = Vec::new();
let mut big_image : Option<Vec<u8>> = None;
if let Ok(()) = std::fs::create_dir_all(&path) {
let file_name = ImageDownloader::extract_image_name(image_url, content_type)?;
let path = path.join(file_name);
let mut image_buffer = std::fs::File::create(&path).map_err(|err| {
error!("Failed to create file {}", path.display());
err
}).context(ImageDownloadErrorKind::IO)?;
response.copy_to(&mut small_image)
.context(ImageDownloadErrorKind::IO)?;
response.copy_to(&mut image_buffer).context(ImageDownloadErrorKind::IO)?;
let path = std::fs::canonicalize(&path).context(ImageDownloadErrorKind::IO)?;
return Ok(path)
if let Some(parent_url) = parent_url {
let mut response_big = self.client.get(parent_url.clone()).send()
.context(ImageDownloadErrorKind::Http)?;
content_type_big = Some(ImageDownloader::check_image_content_type(&response)?
.to_str()
.context(ImageDownloadErrorKind::ContentType)?
.to_owned());
let mut big_buffer : Vec<u8> = Vec::new();
response_big.copy_to(&mut big_buffer)
.context(ImageDownloadErrorKind::IO)?;
big_image = Some(big_buffer);
}
if content_type_small != "image/svg+xml" {
let (original_image, resized_image) = Self::scale_image(&small_image, self.max_size)?;
if let Some(resized_image) = resized_image {
small_image = resized_image;
if big_image.is_none() {
big_image = Some(original_image);
content_type_big = Some(content_type_small.to_owned());
}
}
else {
small_image = original_image;
}
}
Err(ImageDownloadErrorKind::InvalidUrl)?
let small_image_base64 = base64::encode(&small_image);
let big_image_base64 = match big_image {
Some(big_image) => Some(base64::encode(&big_image)),
None => None,
};
let small_image_string = format!("data:{};base64,{}", content_type_small, small_image_base64);
let big_image_string = match big_image_base64 {
Some(big_image_base64) => {
let content_type_big = content_type_big.ok_or(ImageDownloadErrorKind::ParentDownload)
.map_err(|err| {
debug!("content_type_big should not be None when a big image exists");
err
})?;
Some(format!("data:{};base64,{}", content_type_big, big_image_base64))
},
None => None,
};
Ok((small_image_string, big_image_string))
}
fn check_image_content_type(response: &reqwest::Response) -> Result<reqwest::header::HeaderValue, ImageDownloadError> {
@ -152,91 +156,50 @@ impl ImageDownloader {
Err(ImageDownloadErrorKind::Http)?
}
fn get_content_lenght(response: &reqwest::Response) -> Result<u64, ImageDownloadError> {
fn scale_image(image_buffer: &[u8], max_dimensions: (u32, u32)) -> Result<(Vec<u8>, Option<Vec<u8>>), ImageDownloadError> {
let mut original_image : Vec<u8> = Vec::new();
let mut resized_image : Option<Vec<u8>> = None;
if response.status().is_success() {
if let Some(content_length) = response.headers().get(reqwest::header::CONTENT_LENGTH) {
if let Ok(content_length) = content_length.to_str() {
if let Ok(content_length) = content_length.parse::<u64>() {
return Ok(content_length)
}
}
}
let mut image = image::load_from_memory(image_buffer)
.map_err(|err| {
error!("Failed to open image to resize");
err
}).context(ImageDownloadErrorKind::ImageScale)?;
image.write_to(&mut original_image, image::ImageOutputFormat::PNG)
.map_err(|err| {
error!("Failed to save resized image to resize");
err
}).context(ImageDownloadErrorKind::ImageScale)?;
let dimensions = Self::get_image_dimensions(&image);
if dimensions.0 > max_dimensions.0
|| dimensions.1 > max_dimensions.1 {
image = image.resize(max_dimensions.0, max_dimensions.1, image::FilterType::Lanczos3);
let mut resized_buf : Vec<u8> = Vec::new();
image.write_to(&mut resized_buf, image::ImageOutputFormat::PNG)
.map_err(|err| {
error!("Failed to save resized image to resize");
err
}).context(ImageDownloadErrorKind::ImageScale)?;
resized_image = Some(resized_buf);
}
Err(ImageDownloadErrorKind::ContentLenght)?
Ok((original_image, resized_image))
}
fn get_image_dimensions(node: &Node) -> Option<(u32, u32)> {
if let Some(width) = node.get_property("width") {
if let Some(height) = node.get_property("height") {
if let Ok(width) = width.parse::<u32>() {
if let Ok(height) = height.parse::<u32>() {
if width > 1 && height > 1 {
return Some((width, height))
}
}
}
}
fn get_image_dimensions(image: &image::DynamicImage) -> (u32, u32) {
match image {
image::DynamicImage::ImageLuma8(image) => (image.width(), image.height()),
image::DynamicImage::ImageLumaA8(image) => (image.width(), image.height()),
image::DynamicImage::ImageRgb8(image) => (image.width(), image.height()),
image::DynamicImage::ImageRgba8(image) => (image.width(), image.height()),
image::DynamicImage::ImageBgr8(image) => (image.width(), image.height()),
image::DynamicImage::ImageBgra8(image) => (image.width(), image.height()),
}
debug!("Image dimensions not available");
None
}
fn extract_image_name(url: &url::Url, content_type: reqwest::header::HeaderValue) -> Result<String, ImageDownloadError> {
if let Some(file_name) = url.path_segments().and_then(|segments| segments.last()) {
let mut image_name = file_name.to_owned();
if let Some(query) = url.query() {
image_name.push_str("_");
image_name.push_str(query);
}
let header = content_type.to_str().context(ImageDownloadErrorKind::ContentType)?;
let primary_type = match header.find("/") {
Some(end) => header[..end-1].to_string(),
None => "unknown".to_string(),
};
let mut sub_type = match header.find("/") {
None => "unknown".to_string(),
Some(start) => {
match header.find("+") {
None => "unknown".to_string(),
Some(end) => header[start..end-1].to_string(),
}
},
};
if let Some(start) = header.find("+") {
sub_type.push_str("+");
sub_type.push_str(&header[start..].to_string());
};
if let Some(extensions) = mime_guess::get_extensions(&primary_type, &sub_type) {
let mut extension_present = false;
for extension in extensions {
if image_name.ends_with(extension) {
extension_present = true;
break;
}
}
if !extension_present {
image_name.push_str(".");
image_name.push_str(extensions[0]);
}
}
return Ok(image_name)
}
error!("Could not generate image name for {}", url.as_str());
Err(ImageDownloadErrorKind::ImageName)?
}
fn check_image_parent(&self, node: &Node, child_url: &url::Url) -> Result<url::Url, ImageDownloadError> {
if let Some(parent) = node.get_parent() {
if parent.get_name() == "a" {
if let Some(url) = parent.get_property("href") {
@ -244,8 +207,8 @@ impl ImageDownloader {
let parent_response = self.client.head(parent_url.clone()).send().context(ImageDownloadErrorKind::ParentDownload)?;
let _ = ImageDownloader::check_image_content_type(&parent_response).context(ImageDownloadErrorKind::ParentDownload)?;
let child_response = self.client.get(child_url.clone()).send().context(ImageDownloadErrorKind::ParentDownload)?;
let parent_length = ImageDownloader::get_content_lenght(&parent_response).context(ImageDownloadErrorKind::ParentDownload)?;
let child_length = ImageDownloader::get_content_lenght(&child_response).context(ImageDownloadErrorKind::ParentDownload)?;
let parent_length = Self::get_content_lenght(&parent_response).context(ImageDownloadErrorKind::ParentDownload)?;
let child_length = Self::get_content_lenght(&child_response).context(ImageDownloadErrorKind::ParentDownload)?;
if parent_length > child_length {
return Ok(parent_url)
@ -260,28 +223,18 @@ impl ImageDownloader {
Err(ImageDownloadErrorKind::ParentDownload)?
}
fn scale_image(image_path: &PathBuf, max_width: u32, max_height: u32) -> Result<PathBuf, ImageDownloadError> {
let image = image::open(image_path).map_err(|err| {
error!("Failed to open image to resize: {:?}", image_path);
err
}).context(ImageDownloadErrorKind::ImageScale)?;
let image = image.resize(max_width, max_height, image::FilterType::Lanczos3);
if let Some(file_name) = image_path.file_name() {
let mut file_name = file_name.to_os_string();
file_name.push("_resized");
let mut resized_path = image_path.clone();
resized_path.set_file_name(file_name);
if let Err(error) = image.save(&resized_path) {
error!("Failed to write resized image to disk.");
return Err(error).context(ImageDownloadErrorKind::ImageScale)?
fn get_content_lenght(response: &reqwest::Response) -> Result<u64, ImageDownloadError> {
if response.status().is_success() {
if let Some(content_length) = response.headers().get(reqwest::header::CONTENT_LENGTH) {
if let Ok(content_length) = content_length.to_str() {
if let Ok(content_length) = content_length.parse::<u64>() {
return Ok(content_length)
}
}
}
return Ok(resized_path)
}
Err(ImageDownloadErrorKind::ImageScale)?
Err(ImageDownloadErrorKind::ContentLenght)?
}
}

21
src/lib.rs
View file

@ -8,9 +8,6 @@ pub mod images;
use reqwest;
use url;
use regex;
use base64;
use image;
use mime_guess;
use log::{
error,
debug,
@ -52,12 +49,12 @@ pub struct ArticleScraper {
}
impl ArticleScraper {
pub fn new(config_path: PathBuf, save_image_path: PathBuf, download_images: bool) -> Result<ArticleScraper, ScraperError> {
pub fn new(config_path: PathBuf, download_images: bool) -> Result<ArticleScraper, ScraperError> {
let config_files = GrabberConfig::parse_directory(&config_path).context(ScraperErrorKind::Config)?;
Ok(ArticleScraper {
image_downloader: ImageDownloader::new(save_image_path, (2000, 2000), (1000, 800)),
image_downloader: ImageDownloader::new((2000, 2000)),
config_files: config_files,
client: reqwest::Client::new(),
download_images: download_images,
@ -127,7 +124,7 @@ impl ArticleScraper {
}
if self.download_images {
if let Err(error) = self.image_downloader.download_images_from_context(&context, &url) {
if let Err(error) = self.image_downloader.download_images_from_context(&context) {
error!("Downloading images failed: {}", error);
}
}
@ -689,12 +686,12 @@ mod tests {
#[test]
pub fn golem() {
let config_path = PathBuf::from(r"./resources/tests/golem");
let image_path = PathBuf::from(r"./test_output");
let out_path = PathBuf::from(r"./test_output");
let url = url::Url::parse("https://www.golem.de/news/http-error-418-fehlercode-ich-bin-eine-teekanne-darf-bleiben-1708-129460.html").unwrap();
let grabber = ArticleScraper::new(config_path, image_path.clone(), true).unwrap();
let grabber = ArticleScraper::new(config_path, true).unwrap();
let article = grabber.parse(url).unwrap();
article.save_html(&image_path).unwrap();
article.save_html(&out_path).unwrap();
assert_eq!(article.title, Some(String::from("HTTP Error 418: Fehlercode \"Ich bin eine Teekanne\" darf bleiben")));
assert_eq!(article.author, Some(String::from("Hauke Gierow")));
@ -703,12 +700,12 @@ mod tests {
#[test]
pub fn phoronix() {
let config_path = PathBuf::from(r"./resources/tests/phoronix");
let image_path = PathBuf::from(r"./test_output");
let out_path = PathBuf::from(r"./test_output");
let url = url::Url::parse("http://www.phoronix.com/scan.php?page=article&item=amazon_ec2_bare&num=1").unwrap();
let grabber = ArticleScraper::new(config_path, image_path.clone(), true).unwrap();
let grabber = ArticleScraper::new(config_path, true).unwrap();
let article = grabber.parse(url).unwrap();
article.save_html(&image_path).unwrap();
article.save_html(&out_path).unwrap();
assert_eq!(article.title, Some(String::from("Amazon EC2 Cloud Benchmarks Against Bare Metal Systems")));
}