initial commit

src/article.rs

@@ -0,0 +1,39 @@
+use std;
+use url::Url;
+use std::path::PathBuf;
+use chrono::NaiveDateTime;
+use error::{
+    ScraperError,
+    ScraperErrorKind,
+};
+use std::io::Write;
+use failure::ResultExt;
+
+pub struct Article {
+    pub title: Option<String>,
+    pub author: Option<String>,
+    pub url: Url,
+    pub date: Option<NaiveDateTime>,
+    pub html: Option<String>,
+}
+
+impl Article {
+    pub fn save_html(&self, path: &PathBuf) -> Result<(), ScraperError> {
+
+        if let Some(ref html) = self.html {
+            if let Ok(()) = std::fs::create_dir_all(&path) {
+                let mut file_name = match self.title.clone() {
+                    Some(file_name) => file_name,
+                    None => "Unknown Title".to_owned(),
+                };
+                file_name.push_str(".html");
+                let path = path.join(file_name);
+                let mut html_file = std::fs::File::create(&path).context(ScraperErrorKind::IO)?;
+                html_file.write_all(html.as_bytes()).context(ScraperErrorKind::IO)?;
+            }
+        }
+
+        Err(ScraperErrorKind::Unknown)?
+    }
+
+}

src/config/error.rs

@@ -0,0 +1,57 @@
+use failure::{Context, Fail, Backtrace, Error};
+use std::fmt;
+
+#[derive(Debug)]
+pub struct ConfigError {
+    inner: Context<ConfigErrorKind>,
+}
+
+#[derive(Copy, Clone, Eq, PartialEq, Debug, Fail)]
+pub enum ConfigErrorKind {
+    #[fail(display = "IO Error")]
+    IO,
+    #[fail(display = "Config does not contain body xpath")]
+    BadConfig,
+    #[fail(display = "Unknown Error")]
+    Unknown,
+}
+
+impl Fail for ConfigError {
+    fn cause(&self) -> Option<&Fail> {
+        self.inner.cause()
+    }
+
+    fn backtrace(&self) -> Option<&Backtrace> {
+        self.inner.backtrace()
+    }
+}
+
+impl fmt::Display for ConfigError {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        fmt::Display::fmt(&self.inner, f)
+    }
+}
+
+// impl ConfigError {
+//     pub fn kind(&self) -> ConfigErrorKind {
+//         *self.inner.get_context()
+//     }
+// }
+
+impl From<ConfigErrorKind> for ConfigError {
+    fn from(kind: ConfigErrorKind) -> ConfigError {
+        ConfigError { inner: Context::new(kind) }
+    }
+}
+
+impl From<Context<ConfigErrorKind>> for ConfigError {
+    fn from(inner: Context<ConfigErrorKind>) -> ConfigError {
+        ConfigError { inner: inner }
+    }
+}
+
+impl From<Error> for ConfigError {
+    fn from(_: Error) -> ConfigError {
+        ConfigError { inner: Context::new(ConfigErrorKind::Unknown) }
+    }
+}

src/config/macros.rs

@@ -0,0 +1,43 @@
+macro_rules! extract_vec_multi {
+	(
+		$line: ident,
+		$identifier: ident,
+		$vector: ident
+	) => {
+		if $line.starts_with($identifier) {
+			let value = GrabberConfig::extract_value($identifier, $line);
+			let value = GrabberConfig::split_values(value);
+			let value: Vec<String> = value.iter().map(|s| s.trim().to_string()).collect();
+			$vector.extend(value);
+			continue;
+		}
+	};
+}
+
+macro_rules! extract_vec_single {
+	(
+		$line: ident,
+		$identifier: ident,
+		$vector: ident
+	) => {
+		if $line.starts_with($identifier) {
+			let value = GrabberConfig::extract_value($identifier, $line);
+			$vector.push(value.to_string());
+			continue;
+		}
+	};
+}
+
+macro_rules! extract_option_single {
+	(
+		$line: ident,
+		$identifier: ident,
+		$option: ident
+	) => {
+		if $line.starts_with($identifier) {
+			let value = GrabberConfig::extract_value($identifier, $line);
+			$option = Some(value.to_string());
+			continue;
+		}
+	};
+}

src/config/mod.rs

@@ -0,0 +1,188 @@
+use std::collections;
+use std::path::{PathBuf};
+use std::fs;
+use std::io;
+use std::io::BufRead;
+use failure::ResultExt;
+use self::error::{ConfigError, ConfigErrorKind};
+
+#[macro_use]
+mod macros;
+mod error;
+
+pub type ConfigCollection = collections::HashMap<String, GrabberConfig>;
+
+pub struct Replace {
+    pub to_replace: String,
+    pub replace_with: String,
+}
+
+pub struct GrabberConfig {
+    pub xpath_title: Vec<String>,
+    pub xpath_author: Vec<String>,
+    pub xpath_date: Vec<String>,
+    pub xpath_body: Vec<String>,
+    pub xpath_strip: Vec<String>,
+    pub strip_id_or_class: Vec<String>,
+    pub strip_image_src: Vec<String>,
+    pub replace: Vec<Replace>,
+    pub single_page_link: Option<String>,
+    pub next_page_link: Option<String>,
+}
+
+impl GrabberConfig {
+
+    pub fn parse_directory(directory: &PathBuf) -> Result<ConfigCollection, ConfigError> {
+        let paths = fs::read_dir(directory).context(ConfigErrorKind::IO)?;
+
+		let mut collection: collections::HashMap<String, GrabberConfig> = collections::HashMap::new();
+
+        for path in paths {
+            if let Ok(path) = path {
+                if let Some(extension) = path.path().extension() {
+                   if let Some(extension) = extension.to_str() {
+                       if extension == "txt" {
+                            if let Ok(config) = GrabberConfig::new(path.path()) {
+                                collection.insert(path.file_name().to_string_lossy().into_owned(), config);
+                            }
+                       }
+                   } 
+                }
+            }
+        }
+
+		Ok(collection)
+    }
+
+    fn new(config_path: PathBuf) -> Result<GrabberConfig, ConfigError> {
+        let file = fs::File::open(&config_path).context(ConfigErrorKind::IO)?;
+        let buffer = io::BufReader::new(&file);
+
+        let mut xpath_title: Vec<String> = Vec::new();
+        let mut xpath_author: Vec<String> = Vec::new();
+        let mut xpath_date: Vec<String> = Vec::new();
+        let mut xpath_body: Vec<String> = Vec::new();
+        let mut xpath_strip: Vec<String> = Vec::new();
+        let mut strip_id_or_class: Vec<String> = Vec::new();
+        let mut strip_image_src: Vec<String> = Vec::new();
+        let mut replace_vec: Vec<Replace> = Vec::new();
+        let mut next_page_link: Option<String> = None;
+        let mut single_page_link: Option<String> = None;
+
+        // ignore: tidy, prune, autodetect_on_failure and test_url
+        let title = "title:";
+        let body = "body:";
+        let date = "date:";
+        let author = "author:";
+        let strip = "strip:";
+        let strip_id = "strip_id_or_class:";
+        let strip_img = "strip_image_src:";
+        let single_page = "single_page_link:";
+        let next_page = "next_page_link:";
+        let find = "find_string:";
+        let replace = "replace_string:";
+        let replace_single = "replace_string(";
+
+        // ignore these
+        let tidy = "tidy:";
+        let prune = "prune:";
+        let test_url = "test_url:";
+        let autodetect = "autodetect_on_failure:";
+
+        let mut iterator = buffer.lines().peekable();
+        while let Some(Ok(line)) = iterator.next() {
+            let line = line.trim();
+            if line.starts_with("#") 
+            || line.starts_with(tidy)
+            || line.starts_with(prune)
+            || line.starts_with(test_url)
+            || line.starts_with(autodetect)
+            || line.is_empty() {
+                continue;
+            }
+
+
+			extract_vec_multi!(line, title, xpath_title);
+			extract_vec_multi!(line, body, xpath_body);
+			extract_vec_multi!(line, date, xpath_date);
+			extract_vec_multi!(line, author, xpath_author);
+
+			extract_vec_single!(line, strip, xpath_strip);
+			extract_vec_single!(line, strip_id, strip_id_or_class);
+			extract_vec_single!(line, strip_img, strip_image_src);
+
+			extract_option_single!(line, single_page, single_page_link);
+			extract_option_single!(line, next_page, next_page_link);
+
+            if line.starts_with(replace_single) {
+                let value = GrabberConfig::extract_value(replace_single, line);
+                let value: Vec<&str> = value.split("): ").map(|s| s.trim()).collect();
+                if value.len() != 2{
+                    continue;
+                }
+
+                if let Some(to_replace) = value.get(0) {
+                    if let Some(replace_with) = value.get(1) {
+                        replace_vec.push( 
+                            Replace {
+                                to_replace: to_replace.to_string(),
+                                replace_with: replace_with.to_string(),
+                            }
+                        );
+                    }
+                }
+
+				continue;
+            }
+
+            if line.starts_with(find) {
+                let value1 = GrabberConfig::extract_value(find, line);
+
+                if let Some(&Ok(ref next_line)) = iterator.peek() {
+                    let value2 = GrabberConfig::extract_value(replace, &next_line);
+
+                    let r = Replace {
+                        to_replace: value1.to_string(),
+                        replace_with: value2.to_string(),
+                    };
+
+                    replace_vec.push(r);
+                }
+				continue;
+            }
+        }
+
+        if xpath_body.len() == 0 {
+            error!("No body xpath found for {}", config_path.display());
+            Err(ConfigErrorKind::BadConfig)?
+        }
+
+        let config = GrabberConfig {
+            xpath_title: xpath_title,
+            xpath_author: xpath_author,
+            xpath_date: xpath_date,
+            xpath_body: xpath_body,
+            xpath_strip: xpath_strip,
+            strip_id_or_class: strip_id_or_class,
+            strip_image_src: strip_image_src,
+            replace: replace_vec,
+            single_page_link: single_page_link,
+            next_page_link: next_page_link,
+        };
+
+        Ok(config)
+    }
+
+    fn extract_value<'a>(identifier: &str, line: &'a str) -> &'a str {
+        let value = &line[identifier.len()..];
+        let value = value.trim();
+        match value.find('#') {
+            Some(pos) => &value[..pos],
+            None => value,
+        }
+    }
+
+    fn split_values<'a>(values: &'a str) -> Vec<&'a str> {
+        values.split('|').map(|s| s.trim()).collect()
+    }
+}

src/error.rs

@@ -0,0 +1,67 @@
+use failure::{Context, Fail, Backtrace, Error};
+use std::fmt;
+
+#[derive(Debug)]
+pub struct ScraperError {
+    inner: Context<ScraperErrorKind>,
+}
+
+#[derive(Copy, Clone, Eq, PartialEq, Debug, Fail)]
+pub enum ScraperErrorKind {
+    #[fail(display = "libXml Error")]
+    Xml,
+    #[fail(display = "No content found")]
+    Scrape,
+    #[fail(display = "Url Error")]
+    Url,
+    #[fail(display = "Http request failed")]
+    Http,
+    #[fail(display = "Config Error")]
+    Config,
+    #[fail(display = "IO Error")]
+    IO,
+    #[fail(display = "Content-type suggest no html")]
+    ContentType,
+    #[fail(display = "Unknown Error")]
+    Unknown,
+}
+
+impl Fail for ScraperError {
+    fn cause(&self) -> Option<&Fail> {
+        self.inner.cause()
+    }
+
+    fn backtrace(&self) -> Option<&Backtrace> {
+        self.inner.backtrace()
+    }
+}
+
+impl fmt::Display for ScraperError {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        fmt::Display::fmt(&self.inner, f)
+    }
+}
+
+impl ScraperError {
+    pub fn kind(&self) -> ScraperErrorKind {
+        *self.inner.get_context()
+    }
+}
+
+impl From<ScraperErrorKind> for ScraperError {
+    fn from(kind: ScraperErrorKind) -> ScraperError {
+        ScraperError { inner: Context::new(kind) }
+    }
+}
+
+impl From<Context<ScraperErrorKind>> for ScraperError {
+    fn from(inner: Context<ScraperErrorKind>) -> ScraperError {
+        ScraperError { inner: inner }
+    }
+}
+
+impl From<Error> for ScraperError {
+    fn from(_: Error) -> ScraperError {
+        ScraperError { inner: Context::new(ScraperErrorKind::Unknown) }
+    }
+}

src/images/error.rs

@@ -0,0 +1,83 @@
+use failure::{Context, Fail, Backtrace, Error};
+use std::fmt;
+use super::super::ScraperErrorKind;
+
+#[derive(Debug)]
+pub struct ImageDownloadError {
+    inner: Context<ImageDownloadErrorKind>,
+}
+
+#[derive(Copy, Clone, Eq, PartialEq, Debug, Fail)]
+pub enum ImageDownloadErrorKind {
+    #[fail(display = "Parsing the supplied html string failed")]
+    HtmlParse,
+    #[fail(display = "Scaling down a downloaded image failed")]
+    ImageScale,
+    #[fail(display = "Downloading the parent element of an image failed")]
+    ParentDownload,
+    #[fail(display = "Generating image name failed")]
+    ImageName,
+    #[fail(display = "Getting the content-length property failed")]
+    ContentLenght,
+    #[fail(display = "Content-type suggest no image")]
+    ContentType,
+    #[fail(display = "Http error")]
+    Http,
+    #[fail(display = "IO error")]
+    IO,
+    #[fail(display = "Invalid URL")]
+    InvalidUrl,
+    #[fail(display = "Unknown Error")]
+    Unknown,
+}
+
+impl Fail for ImageDownloadError {
+    fn cause(&self) -> Option<&Fail> {
+        self.inner.cause()
+    }
+
+    fn backtrace(&self) -> Option<&Backtrace> {
+        self.inner.backtrace()
+    }
+}
+
+impl fmt::Display for ImageDownloadError {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        fmt::Display::fmt(&self.inner, f)
+    }
+}
+
+impl ImageDownloadError {
+    pub fn kind(&self) -> ImageDownloadErrorKind {
+        *self.inner.get_context()
+    }
+}
+
+impl From<ImageDownloadErrorKind> for ImageDownloadError {
+    fn from(kind: ImageDownloadErrorKind) -> ImageDownloadError {
+        ImageDownloadError { inner: Context::new(kind) }
+    }
+}
+
+impl From<Context<ImageDownloadErrorKind>> for ImageDownloadError {
+    fn from(inner: Context<ImageDownloadErrorKind>) -> ImageDownloadError {
+        ImageDownloadError { inner: inner }
+    }
+}
+
+impl From<ScraperErrorKind> for ImageDownloadError {
+    fn from(kind: ScraperErrorKind) -> ImageDownloadError {
+        let kind = match kind {
+            ScraperErrorKind::Xml => ImageDownloadErrorKind::HtmlParse,
+            _ => ImageDownloadErrorKind::Unknown,
+        };
+
+        ImageDownloadError { inner: Context::new(kind) }
+    }
+}
+
+impl From<Error> for ImageDownloadError {
+    fn from(_: Error) -> ImageDownloadError {
+        ImageDownloadError { inner: Context::new(ImageDownloadErrorKind::Unknown) }
+    }
+}

src/images/mod.rs

@@ -0,0 +1,280 @@
+use std::path::PathBuf;
+use reqwest;
+use libxml::parser::Parser;
+use libxml::xpath::Context;
+use libxml::tree::Node;
+use url;
+use failure::ResultExt;
+use std::error::Error;
+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 {
+        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> {
+
+        let parser = Parser::default_html();
+        let doc = match parser.parse_string(html) {
+            Ok(doc) => doc,
+            Err(_) => {
+                error!("Failed to parse HTML string");
+                return Err(ImageDownloadErrorKind::HtmlParse)?
+            }
+        };
+
+        let xpath_ctx = match Context::new(&doc) {
+            Ok(context) => context,
+            Err(_) => {
+                error!("Failed to create xpath context for document");
+                return Err(ImageDownloadErrorKind::HtmlParse)?
+            }
+        };
+
+        self.download_images_from_context(&xpath_ctx, article_url)?;
+
+        Ok(doc.to_string(/*format:*/ false))
+    }
+
+    pub fn download_images_from_context(&self, context: &Context, article_url: &url::Url) -> 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) {
+                    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 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) {
+                        return Err(ImageDownloadErrorKind::HtmlParse)?;
+                    }
+                }
+            }
+        }
+
+        Ok(())
+    }
+
+    fn save_image(&self, image_url: &url::Url, article_url: &url::Url) -> Result<PathBuf, ImageDownloadError> {
+
+        let mut response = match self.client.get(image_url.clone()).send() {
+            Ok(response) => response,
+            Err(error) => {
+                error!("GET {} failed - {}", image_url.as_str(), error.description());
+                Err(error).context(ImageDownloadErrorKind::Http)?
+            }
+        };
+        let content_type = ImageDownloader::check_image_content_type(&response)?;
+        
+        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);
+
+            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 = match std::fs::File::create(&path) {
+                    Ok(buffer) => buffer,
+                    Err(error) => {
+                        error!("Failed to create file {}", path.display());
+                        Err(error).context(ImageDownloadErrorKind::IO)?
+                    }
+                };
+
+                response.copy_to(&mut image_buffer).context(ImageDownloadErrorKind::IO)?;
+                let path = std::fs::canonicalize(&path).context(ImageDownloadErrorKind::IO)?;
+                return Ok(path)
+            }
+        }
+
+        Err(ImageDownloadErrorKind::InvalidUrl)?
+    }
+
+    fn check_image_content_type(response: &reqwest::Response) -> Result<reqwest::header::ContentType, ImageDownloadError> {
+    
+        if response.status().is_success() {
+            if let Some(content_type) = response.headers().get::<reqwest::header::ContentType>() {
+                if content_type.type_() == reqwest::mime::IMAGE {
+                    return Ok(content_type.clone())
+                }
+            }
+
+            error!("{} is not an image", response.url());
+            return Err(ImageDownloadErrorKind::ContentType)?
+        }
+
+        Err(ImageDownloadErrorKind::Http)?
+    }
+
+    fn get_content_lenght(response: &reqwest::Response) -> Result<u64, ImageDownloadError> {
+
+        if response.status().is_success() {
+            if let Some(&reqwest::header::ContentLength(content_length)) = response.headers().get::<reqwest::header::ContentLength>() {
+                return Ok(content_length)
+            }
+        }
+
+        Err(ImageDownloadErrorKind::ContentLenght)?
+    }
+
+    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))
+                        }
+                    }
+                }
+            }
+        }
+
+        debug!("Image dimensions not available");
+        None
+    }
+
+    fn extract_image_name(url: &url::Url, content_type: reqwest::header::ContentType) -> 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 primary_type = content_type.type_().as_str();
+            let mut sub_type = content_type.subtype().as_str().to_owned();
+            if let Some(suffix) = content_type.suffix() {
+                sub_type.push_str("+");
+                sub_type.push_str(suffix.as_str());
+            }
+            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") {
+                    let parent_url = url::Url::parse(&url).context(ImageDownloadErrorKind::ParentDownload)?;
+                    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)?;
+
+                    if parent_length > child_length {
+                        return Ok(parent_url)
+                    }
+
+                    return Ok(child_url.clone())
+                }
+            }
+        }
+
+        debug!("Image parent element not relevant");
+        Err(ImageDownloadErrorKind::ParentDownload)?
+    }
+
+    fn scale_image(image_path: &PathBuf, max_width: u32, max_height: u32) -> Result<PathBuf, ImageDownloadError> {
+
+        let image = match image::open(image_path) {
+            Ok(image) => image,
+            Err(error) => {
+                error!("Failed to open image to resize: {:?}", image_path);
+                return Err(error).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)?
+            }
+                
+            return Ok(resized_path)
+        }
+
+        Err(ImageDownloadErrorKind::ImageScale)?
+    }
+}

src/lib.rs

@@ -0,0 +1,723 @@
+#[macro_use]
+extern crate failure;
+extern crate libxml;
+extern crate reqwest;
+extern crate url;
+extern crate regex;
+extern crate encoding_rs;
+extern crate html2text;
+extern crate htmlescape;
+extern crate base64;
+extern crate image;
+extern crate chrono;
+extern crate mime_guess;
+#[macro_use]
+extern crate log;
+
+#[macro_use]
+mod macros;
+mod config;
+mod error;
+mod article;
+pub mod images;
+
+use article::Article;
+use libxml::parser::Parser;
+use libxml::xpath::Context;
+use libxml::tree::{
+    Document,
+    Node
+};
+use std::path::PathBuf;
+use std::ops::Index;
+use failure::ResultExt;
+use std::error::Error;
+use config::{
+    GrabberConfig,
+    ConfigCollection
+};
+use encoding_rs::*;
+use chrono::NaiveDateTime;
+use std::str::FromStr;
+use images::ImageDownloader;
+use self::error::{
+    ScraperError,
+    ScraperErrorKind
+};
+
+
+pub struct ArticleScraper {
+    image_downloader: ImageDownloader,
+    config_files: ConfigCollection,
+    client: reqwest::Client,
+    pub download_images: bool,
+}
+
+impl ArticleScraper {
+    pub fn new(config_path: PathBuf, save_image_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)),
+            config_files: config_files,
+            client: reqwest::Client::new(),
+            download_images: download_images,
+        })
+    }
+
+    pub fn parse(&self, url: url::Url) -> Result<Article, ScraperError> {
+
+        info!("Scraping article: {}", url.as_str());
+
+        // do a HEAD request to url
+        let response = match self.client.head(url.clone()).send() {
+            Ok(response) => response,
+            Err(error) => {
+                error!("Failed head request to: {} - {}", url.as_str(), error.description());
+                Err(error).context(ScraperErrorKind::Http)?
+            }
+        };
+
+        // check if url redirects and we need to pick up the new url
+        let mut url = url;
+        if let Some(new_url) = ArticleScraper::check_redirect(&response) {
+            debug!("Url {} redirects to {}", url.as_str(), new_url.as_str());
+            url = new_url;
+        }
+
+        // check if we are dealing with text/html
+        if !ArticleScraper::check_content_type(&response)? {
+            return Err(ScraperErrorKind::ContentType)?
+        }
+
+        // check if we have a config for the url
+        let config = self.get_grabber_config(&url)?;
+
+        let mut article = Article {
+            title: None,
+            author: None,
+            url: url.clone(),
+            date: None,
+            html: None,
+        };
+
+        // create empty document to hold the content
+        let mut document = match Document::new() {
+            Ok(doc) => doc,
+            Err(()) => return Err(ScraperErrorKind::Xml)?
+        };
+
+        let mut root = match Node::new("article", None, &document) {
+            Ok(root) => root,
+            Err(()) => return Err(ScraperErrorKind::Xml)?
+        };
+
+        document.set_root_element(&root);
+
+        ArticleScraper::generate_head(&mut root, &document)?;
+
+        self.parse_first_page(&mut article, &url, &mut root, config)?;
+
+        let context = match Context::new(&document) {
+            Ok(context) => context,
+            Err(_) => {
+                error!("Failed to create xpath context for extracted article");
+                return Err(ScraperErrorKind::Xml)?
+            }
+        };
+
+        if let Err(error) = ArticleScraper::prevent_self_closing_tags(&context) {
+            error!("Preventing self closing tags failed - {}", error);
+            return Err(error)
+        }
+
+        if let Err(error) = ArticleScraper::eliminate_noscrip_tag(&context) {
+            error!("Eliminating <noscript> tag failed - {}", error);
+            return Err(error)
+        }
+
+        if self.download_images {
+            if let Err(error) = self.image_downloader.download_images_from_context(&context, &url) {
+                error!("Downloading images failed: {}", error);
+            }
+        }
+
+        // serialize content
+        let html = document.to_string(/*format:*/ false);
+        article.html = Some(html);
+        
+        Ok(article)
+    }
+
+    fn parse_first_page(&self, article: &mut Article, url: &url::Url, root: &mut Node, config: &GrabberConfig) -> Result<(), ScraperError> {
+
+        let mut html = ArticleScraper::download(&url, &self.client)?;
+        parse_html!(html, config, xpath_ctx);
+
+        // check for single page link
+        let mut xpath_ctx = xpath_ctx;
+        if let Some(xpath_single_page_link) = config.single_page_link.clone() {
+            debug!("Single page link xpath specified in config {}", xpath_single_page_link);
+            if let Ok(result) = xpath_ctx.findvalue(&xpath_single_page_link, None) {
+                // parse again with single page url
+                debug!("Single page link found {}", result);
+                let single_page_url = url::Url::parse(&result).context(ScraperErrorKind::Url)?;
+                return self.parse_single_page(article, &single_page_url, root, config);
+            }
+        }
+
+        ArticleScraper::extract_metadata(&xpath_ctx, config, article);
+        ArticleScraper::strip_junk(&xpath_ctx, config, &url);
+        ArticleScraper::extract_body(&xpath_ctx, root, config)?;
+
+        self.check_for_next_page(&xpath_ctx, config, root)
+    }
+
+    fn parse_next_page(&self, url: &url::Url, root: &mut Node, config: &GrabberConfig) -> Result<(), ScraperError> {
+
+        let mut html = ArticleScraper::download(&url, &self.client)?;
+        parse_html!(html, config, xpath_ctx);
+        ArticleScraper::strip_junk(&xpath_ctx, config, &url);
+        ArticleScraper::extract_body(&xpath_ctx, root, config)?;
+
+        self.check_for_next_page(&xpath_ctx, config, root)
+    }
+
+    fn parse_single_page(&self, article: &mut Article, url: &url::Url, root: &mut Node, config: &GrabberConfig) -> Result<(), ScraperError> {
+        
+        let mut html = ArticleScraper::download(&url, &self.client)?;
+        parse_html!(html, config, xpath_ctx);
+        ArticleScraper::extract_metadata(&xpath_ctx, config, article);
+        ArticleScraper::strip_junk(&xpath_ctx, config, &url);
+        ArticleScraper::extract_body(&xpath_ctx, root, config)?;
+
+        Ok(())
+    }
+
+    fn download(url: &url::Url, client: &reqwest::Client) -> Result<String, ScraperError> {
+
+        let mut response = match client.get(url.as_str()).send() {
+            Ok(response) => response,
+            Err(error) => {
+                error!("Downloading HTML failed: GET {} - {}", url.as_str(), error.description());
+                return Err(error).context(ScraperErrorKind::Http)?
+            }
+        };
+
+        if response.status().is_success() {
+            let text = response.text().context(ScraperErrorKind::Http)?;
+            {
+                if let Some(decoded_html) = ArticleScraper::decode_html(&text, ArticleScraper::get_encoding_from_html(&text)) {
+                    return Ok(decoded_html)
+                }
+
+                if let Some(decoded_html) = ArticleScraper::decode_html(&text, ArticleScraper::get_encoding_from_http_header(response.headers())) {
+                    return Ok(decoded_html)
+                }
+            }
+
+            warn!("No encoding of HTML detected - assuming utf-8");
+            return Ok(text)
+        }
+        
+        Err(ScraperErrorKind::Http)?
+    }
+
+    fn get_encoding_from_http_header(headers: &reqwest::header::Headers) -> Option<&str> {
+
+        if let Some(content_type) = headers.get::<reqwest::header::ContentType>() {
+            if let Some(encoding) = content_type.get_param(reqwest::mime::CHARSET) {
+                return Some(encoding.as_str())
+            }
+        }
+        None
+    }
+
+    fn get_encoding_from_html(html: &str) -> Option<&str> {
+        let regex = regex::Regex::new(r#"<meta.*?charset=([^"']+)"#).unwrap();
+        if let Some(captures) = regex.captures(html) {
+            if let Some(regex_match) = captures.get(1) {
+                return Some(regex_match.as_str())
+            }
+        }
+        None
+    }
+
+    fn decode_html(html: &str, encoding: Option<&str>) -> Option<String> {
+
+        if let Some(encoding) = encoding {
+            if let Some(encoding) = Encoding::for_label(encoding.as_bytes()) {
+                let (decoded_html, _, invalid_chars) = encoding.decode(html.as_bytes());
+
+                if !invalid_chars {
+                    return Some(decoded_html.into_owned())
+                }
+            }
+            warn!("Could not decode HTML. Encoding: {}", encoding);
+        }
+        None
+    }
+
+    fn get_grabber_config(&self, url: &url::Url) -> Result<&GrabberConfig, ScraperError> {
+
+        let config_name = match url.host_str()
+        {
+            Some(name) => {
+                let mut name = name;
+                if name.starts_with("www.") {
+                    name = &name[4..]
+                }
+                name
+            },
+            None => {
+                error!("Getting config failed due to bad Url");
+                return Err(ScraperErrorKind::Config)?
+            },
+        };
+
+        let config_name = config_name.to_owned() + ".txt";
+
+        if !self.config_files.contains_key(&config_name) {
+            error!("No config file of the name {} fount", config_name);
+            Err(ScraperErrorKind::Config)?
+        }
+
+        Ok(self.config_files.index(&config_name))
+    }
+
+    fn check_content_type(response: &reqwest::Response) -> Result<bool, ScraperError> {
+    
+        if response.status().is_success() {
+            if let Some(content_type) = response.headers().get::<reqwest::header::ContentType>() {
+                if content_type.type_() == reqwest::mime::TEXT && content_type.subtype() == reqwest::mime::HTML {
+                    return Ok(true)
+                }
+            }
+
+            error!("Content type is not text/HTML");
+            return Ok(false)
+        }
+
+        error!("Failed to determine content type");
+        Err(ScraperErrorKind::Http)?
+    }
+
+    fn check_redirect(response: &reqwest::Response) -> Option<url::Url> {
+        
+        if response.status() == reqwest::StatusCode::PermanentRedirect {
+            debug!("Article url redirects to {}", response.url().as_str());
+            return Some(response.url().clone())
+        }
+
+        None
+    }
+
+    fn extract_value(context: &Context, xpath: &str) -> Result<String, ScraperError> {
+
+        evaluate_xpath!(context, xpath, node_vec);
+        xpath_result_empty!(node_vec, xpath);
+        if let Some(val) = node_vec.get(0) {
+            return Ok(val.get_content())
+        }
+        
+        Err(ScraperErrorKind::Xml)?
+    }
+
+    fn extract_value_merge(context: &Context, xpath: &str) -> Result<String, ScraperError> {
+
+        evaluate_xpath!(context, xpath, node_vec);
+        xpath_result_empty!(node_vec, xpath);
+        let mut val = String::new();
+        for node in node_vec {
+            val.push_str(&node.get_content());
+        }
+        
+        return Ok(val.trim().to_string())
+    }
+
+    fn strip_node(context: &Context, xpath: &String) -> Result<(), ScraperError> {
+
+        let mut ancestor = xpath.clone();
+        if ancestor.starts_with("//") {
+            ancestor = ancestor.chars().skip(2).collect();
+        }
+
+        let query = &format!("{}[not(ancestor::{})]", xpath, ancestor);
+        evaluate_xpath!(context, query, node_vec);
+        for mut node in node_vec {
+            node.unlink();
+        }
+        Ok(())
+    }
+
+    fn strip_id_or_class(context: &Context, id_or_class: &String) -> Result<(), ScraperError> {
+
+        let xpath = &format!("//*[contains(@class, '{}') or contains(@id, '{}')]", id_or_class, id_or_class);
+        evaluate_xpath!(context, xpath, node_vec);
+        for mut node in node_vec {
+            node.unlink();
+        }
+        Ok(())
+    }
+
+    fn fix_lazy_images(context: &Context, class: &str, property_url: &str) -> Result<(), ScraperError> {
+        
+        let xpath = &format!("//img[contains(@class, '{}')]", class);
+        evaluate_xpath!(context, xpath, node_vec);
+        for mut node in node_vec {
+            if let Some(correct_url) = node.get_property(property_url) {
+                if let Err(_) = node.set_property("src", &correct_url) {
+                    return Err(ScraperErrorKind::Xml)?;
+                }
+            }
+        }
+        Ok(())
+    }
+
+    fn fix_iframe_size(context: &Context, site_name: &str) -> Result<(), ScraperError> {
+
+        let xpath = &format!("//iframe[contains(@src, '{}')]", site_name);
+        evaluate_xpath!(context, xpath, node_vec);
+        for mut node in node_vec {
+            if let Some(mut parent) = node.get_parent() {
+                if let Ok(mut video_wrapper) = parent.new_child(None, "div") {
+                    if let Ok(()) = video_wrapper.set_property("class", "videoWrapper") {
+                        if let Ok(()) = node.set_property("width", "100%") {
+                            if let Ok(()) = node.remove_property("height") {
+                                node.unlink();
+                                match video_wrapper.add_child(&mut node) {
+                                    Ok(_) => continue,
+                                    Err(_) => {
+                                        error!("Failed to add iframe as child of video wrapper <div>");
+                                        return Err(ScraperErrorKind::Xml)?
+                                    }
+                                }
+                            }
+                        }
+                    }
+                }
+                
+                error!("Failed to add video wrapper <div> as parent of iframe");
+                return Err(ScraperErrorKind::Xml)?
+            }
+            
+            error!("Failed to get parent of iframe");
+            return Err(ScraperErrorKind::Xml)?
+        }
+        Ok(())
+    }
+
+    fn remove_attribute(context: &Context, tag: Option<&str>, attribute: &str) -> Result<(), ScraperError> {
+
+        let xpath_tag = match tag {
+            Some(tag) => tag,
+            None => "*"
+        };
+
+        let xpath = &format!("//{}[@{}]", xpath_tag, attribute);
+        evaluate_xpath!(context, xpath, node_vec);
+        for mut node in node_vec {
+            if let Err(_) = node.remove_property(attribute) {
+                return Err(ScraperErrorKind::Xml)?
+            }
+        }
+        Ok(())
+    }
+
+    fn add_attribute(context: &Context, tag: Option<&str>, attribute: &str, value: &str) -> Result<(), ScraperError> {
+
+        let xpath_tag = match tag {
+            Some(tag) => tag,
+            None => "*"
+        };
+
+        let xpath = &format!("//{}", xpath_tag);
+        evaluate_xpath!(context, xpath, node_vec);
+        for mut node in node_vec {
+            if let Err(_) = node.set_attribute(attribute, value) {
+                return Err(ScraperErrorKind::Xml)?
+            }
+        }
+        Ok(())
+    }
+
+    fn get_attribute(context: &Context, xpath: &str, attribute: &str) -> Result<String, ScraperError> {
+
+        evaluate_xpath!(context, xpath, node_vec);
+        xpath_result_empty!(node_vec, xpath);
+        for node in node_vec {
+            if let Some(value) = node.get_attribute(attribute) {
+                return Ok(value)
+            }
+        }
+
+        Err(ScraperErrorKind::Xml)?
+    }
+
+    fn repair_urls(context: &Context, xpath: &str, attribute: &str, article_url: &url::Url) -> Result<(), ScraperError> {
+
+        evaluate_xpath!(context, xpath, node_vec);
+        for mut node in node_vec {
+            if let Some(val) = node.get_attribute(attribute) {
+                if let Err(url::ParseError::RelativeUrlWithoutBase) = url::Url::parse(&val) {
+                    if let Ok(fixed_url) = ArticleScraper::complete_url(article_url, &val) {
+                        if let Err(_) = node.set_attribute(attribute, fixed_url.as_str()) {
+                            return Err(ScraperErrorKind::Xml)?
+                        }
+                    }
+                }
+            }
+        }
+        Ok(())
+    }
+
+    fn complete_url(article_url: &url::Url, incomplete_url: &str) -> Result<url::Url, ScraperError> {
+
+        let mut completed_url = article_url.scheme().to_owned();
+        completed_url.push(':');
+
+        if !incomplete_url.starts_with("//") {
+            match article_url.host() {
+                Some(url::Host::Domain(host)) => {
+                    completed_url.push_str("//");
+                    completed_url.push_str(host);
+                }
+                _ => return Err(ScraperErrorKind::Url)?
+            };
+        }
+
+        completed_url.push_str(incomplete_url);
+        let url = url::Url::parse(&completed_url).context(ScraperErrorKind::Url)?;
+        return Ok(url)
+    }
+
+    fn strip_junk(context: &Context, config: &GrabberConfig, url: &url::Url) {
+
+        // strip specified xpath
+        for xpath_strip in &config.xpath_strip {
+            let _ = ArticleScraper::strip_node(&context, xpath_strip);
+        }
+
+        // strip everything with specified 'id' or 'class'
+        for xpaht_strip_class in &config.strip_id_or_class {
+            let _ = ArticleScraper::strip_id_or_class(&context, xpaht_strip_class);
+        }
+
+        // strip any <img> element where @src attribute contains this substring
+        for xpath_strip_img_src in &config.strip_image_src {
+            let _ = ArticleScraper::strip_node(&context, &format!("//img[contains(@src,'{}')]", xpath_strip_img_src));
+        }
+
+        let _ = ArticleScraper::fix_lazy_images(&context, "lazyload", "data-src");
+        let _ = ArticleScraper::fix_iframe_size(&context, "youtube.com");
+        let _ = ArticleScraper::remove_attribute(&context, None, "style");
+        let _ = ArticleScraper::remove_attribute(&context, Some("a"), "onclick");
+        let _ = ArticleScraper::remove_attribute(&context, Some("img"), "srcset");
+        let _ = ArticleScraper::remove_attribute(&context, Some("img"), "sizes");
+        let _ = ArticleScraper::add_attribute(&context, Some("a"), "target", "_blank");
+
+        let _ = ArticleScraper::repair_urls(&context, "//img", "src", &url);
+        let _ = ArticleScraper::repair_urls(&context, "//a", "src", &url);
+        let _ = ArticleScraper::repair_urls(&context, "//a", "href", &url);
+        let _ = ArticleScraper::repair_urls(&context, "//object", "data", &url);
+        let _ = ArticleScraper::repair_urls(&context, "//iframe", "src", &url);
+
+        // strip elements using Readability.com and Instapaper.com ignore class names
+		// .entry-unrelated and .instapaper_ignore
+		// See http://blog.instapaper.com/post/730281947
+        let _ = ArticleScraper::strip_node(&context, &String::from(
+            "//*[contains(@class,' entry-unrelated ') or contains(@class,' instapaper_ignore ')]"));
+
+        // strip elements that contain style="display: none;"
+        let _ = ArticleScraper::strip_node(&context, &String::from("//*[contains(@style,'display:none')]"));
+
+        // strip all scripts
+        let _ = ArticleScraper::strip_node(&context, &String::from("//script"));
+
+        // strip all comments
+        let _ = ArticleScraper::strip_node(&context, &String::from("//comment()"));
+
+        // strip all empty url-tags <a/>
+        let _ = ArticleScraper::strip_node(&context, &String::from("//a[not(node())]"));
+
+        // strip all external css and fonts 
+        let _ = ArticleScraper::strip_node(&context, &String::from("//*[@type='text/css']"));
+    }
+
+    fn extract_metadata(context: &Context, config: &GrabberConfig, article: &mut Article) {
+
+        // try to get title
+        for xpath_title in &config.xpath_title {
+            if let Ok(title) = ArticleScraper::extract_value_merge(&context, xpath_title) {
+                debug!("Article title: {}", title);
+                article.title = Some(title);
+                break;
+            }
+        }
+
+        // try to get the author
+        for xpath_author in &config.xpath_author {
+            if let Ok(author) = ArticleScraper::extract_value(&context, xpath_author) {
+                debug!("Article author: {}", author);
+                article.author = Some(author);
+                break;
+            }
+        }
+
+        // try to get the date
+        for xpath_date in &config.xpath_date {
+            if let Ok(date_string) = ArticleScraper::extract_value(&context, xpath_date) {
+                debug!("Article date: {}", date_string);
+                if let Ok(date) = NaiveDateTime::from_str(&date_string) {
+                    article.date = Some(date);
+                    break;
+                }
+                else {
+                    warn!("Parsing the date string '{}' failed", date_string);
+                }
+            }
+        }
+    }
+
+    fn extract_body(context: &Context, root: &mut Node, config: &GrabberConfig) -> Result<(), ScraperError> {
+
+        let mut found_something = false;
+        for xpath_body in &config.xpath_body {
+            found_something = ArticleScraper::extract_body_single(&context, root, xpath_body)?;
+        }
+
+        if !found_something {
+            return Err(ScraperErrorKind::Scrape)?
+        }
+
+        Ok(())
+    }
+
+    fn extract_body_single(context: &Context, root: &mut Node, xpath: &str) -> Result<bool, ScraperError> {
+
+        let mut found_something = false;
+        {
+            evaluate_xpath!(context, xpath, node_vec);
+            xpath_result_empty!(node_vec, xpath);
+            for mut node in node_vec {
+                if node.get_property("style").is_some() {
+                    if let Err(_) = node.remove_property("style") {
+                        return Err(ScraperErrorKind::Xml)?
+                    }
+                }
+
+                node.unlink();
+                if let Ok(_) = root.add_child(&mut node) {
+                    found_something = true;
+                }
+                else {
+                    error!("Failed to add body to prepared document");
+                    return Err(ScraperErrorKind::Xml)?
+                }
+            }
+        }
+
+        Ok(found_something)
+    }
+
+    fn check_for_next_page(&self, context: &Context, config: &GrabberConfig, root: &mut Node) -> Result<(), ScraperError> {
+
+        if let Some(next_page_xpath) = config.next_page_link.clone() {
+            if let Ok(next_page_string) = ArticleScraper::get_attribute(&context, &next_page_xpath, "href") {
+                if let Ok(next_page_url) = url::Url::parse(&next_page_string) {
+                    return self.parse_next_page(&next_page_url, root, config)
+                }
+            }
+        }
+
+        // last page reached
+        Ok(())
+    }
+
+    fn generate_head(root: &mut Node, document: &Document) -> Result<(), ScraperError> {
+
+        if let Ok(mut head_node) = Node::new("head", None, document) {
+            if let Ok(()) = root.add_prev_sibling(&mut head_node) {
+                if let Ok(mut meta) = head_node.new_child(None, "meta") {
+                    if let Ok(_) = meta.set_property("charset", "utf-8") {
+                        return Ok(())
+                    }
+                }
+            }
+        }
+
+        Err(ScraperErrorKind::Xml)?
+    }
+
+    fn prevent_self_closing_tags(context: &Context) -> Result<(), ScraperError> {
+
+        // search document for empty tags and add a empty text node as child
+        // this prevents libxml from self closing non void elements such as iframe
+
+        let xpath = "//*[not(node())]";
+        evaluate_xpath!(context, xpath, node_vec);
+        for mut node in node_vec {
+            if node.get_name() == "meta" {
+                continue
+            }
+
+            let _ = node.add_text_child(None, "empty", "");
+        }
+
+        Ok(())
+    }
+
+    fn eliminate_noscrip_tag(context: &Context) -> Result<(), ScraperError> {
+
+        let xpath = "//noscript";
+        evaluate_xpath!(context, xpath, node_vec);
+
+        for mut node in node_vec {
+            if let Some(mut parent) = node.get_parent() {
+                node.unlink();
+                let children = node.get_child_nodes();
+                for mut child in children {
+                    child.unlink();
+                    let _ = parent.add_child(&mut child);
+                }
+            }
+            
+        }
+
+        Ok(())
+    }
+}
+
+
+#[cfg(test)]
+mod tests {
+    use ::*;
+    
+    #[test]
+    pub fn golem() {
+        let config_path = PathBuf::from(r"./resources/tests/golem");
+        let image_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 article = grabber.parse(url).unwrap();
+        article.save_html(&image_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")));
+    }
+
+    #[test]
+    pub fn phoronix() {
+        let config_path = PathBuf::from(r"./resources/tests/phoronix");
+        let image_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 article = grabber.parse(url).unwrap();
+        article.save_html(&image_path).unwrap();
+
+        assert_eq!(article.title, Some(String::from("Amazon EC2 Cloud Benchmarks Against Bare Metal Systems")));
+    }
+}

src/macros.rs

@@ -0,0 +1,60 @@
+macro_rules! parse_html {
+    (
+        $html: ident,
+        $config: ident,
+        $xpath_ctx: ident
+    ) => {
+        // replace matches in raw html
+        for replace in &$config.replace {
+            $html = $html.replace(&replace.to_replace, &replace.replace_with);
+        }
+
+        // parse html
+        let parser = Parser::default_html();
+        let doc = match parser.parse_string($html.as_str()) {
+            Ok(doc) => doc,
+            Err(_) => {
+                error!("Parsing HTML failed for downloaded HTML");
+                return Err(ScraperErrorKind::Xml)?
+            }
+        };
+
+        let $xpath_ctx = match Context::new(&doc) {
+            Ok(context) => context,
+            Err(_) => {
+                error!("Creating xpath context failed for downloaded HTML");
+                return Err(ScraperErrorKind::Xml)?
+            }
+        };
+    };
+}
+
+macro_rules! evaluate_xpath {
+    (
+        $context: ident,
+        $xpath: ident,
+        $node_vec: ident
+    ) => {
+        let res = match $context.evaluate($xpath) {
+            Ok(result) => result,
+            Err(_) => {
+                error!("Evaluation of xpath {} yielded no results", $xpath);
+                return Err(ScraperErrorKind::Xml)?
+            }
+        };
+
+        let $node_vec = res.get_nodes_as_vec();
+    };
+}
+
+macro_rules! xpath_result_empty {
+    (
+        $node_vec: ident,
+        $xpath: ident
+    ) => {
+        if $node_vec.len() == 0 {
+            error!("Evaluation of xpath {} yielded no results", $xpath);
+            return Err(ScraperErrorKind::Xml)?
+        }
+    };
+}