✨ `LibreX` for the search engine (#429)

* ✨ feat(engine): provide librex search engine (#318)

* ✨ feat(engine): provide librex search engine (#318)

* ✨ feat(engine): provide librex search engine (#318)

* 🔖 chore(release): bump the app version (#318)

* 🔖 chore(release): bump the app version (#318)

* ✨ feat(engine): provide librex search engine (#318)

* ✨ feat(engine): provide librex search engine (#429)

Co-authored-by: neon_arch <[email protected]>

* ✨ feat(engine): provide librex search engine (#429)

Co-authored-by: neon_arch <[email protected]>

* ✨ feat(engine): provide librex search engine (#429)

Co-authored-by: neon_arch <[email protected]>

* ✨ feat(engine): provide librex search engine (#429)

* ✨ feat(engine): provide librex search engine (#429)

* ✨ feat(engine): provide librex search engine (#429)

* ✨ feat(engine): provide librex search engine (#429)

Co-authored-by: neon_arch <[email protected]>

---------

Co-authored-by: neon_arch <[email protected]>

Cargo.lock

@@ -4066,7 +4066,7 @@ checksum = "1778a42e8b3b90bff8d0f5032bf22250792889a5cdc752aa0020c84abe3aaf10"
 
 [[package]]
 name = "websurfx"
-version = "1.4.2"
+version = "1.5.0"
 dependencies = [
  "actix-cors",
  "actix-files",

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "websurfx"
-version = "1.4.2"
+version = "1.5.0"
 edition = "2021"
 description = "An open-source alternative to Searx that provides clean, ad-free, and organic results with incredible speed while keeping privacy and security in mind."
 repository = "https://github.com/neon-mmd/websurfx"

src/engines/librex.rs

@@ -0,0 +1,111 @@
+//! The `librex` module contains the implementation of a search engine for LibreX using the reqwest and scraper libraries.
+//! It includes a `SearchEngine` trait implementation for interacting with the search engine and retrieving search results.
+
+use std::collections::HashMap;
+
+use reqwest::header::HeaderMap;
+use reqwest::Client;
+use scraper::Html;
+
+use crate::models::aggregation_models::SearchResult;
+use crate::models::engine_models::{EngineError, SearchEngine};
+
+use error_stack::{Report, Result, ResultExt};
+
+use super::search_result_parser::SearchResultParser;
+
+/// Represents the LibreX search engine.
+pub struct LibreX {
+    /// The parser used to extract search results from HTML documents.
+    parser: SearchResultParser,
+}
+
+impl LibreX {
+    /// Creates a new instance of LibreX with a default configuration.
+    ///
+    /// # Returns
+    ///
+    /// Returns a `Result` containing `LibreX` if successful, otherwise an `EngineError`.
+    pub fn new() -> Result<Self, EngineError> {
+        Ok(Self {
+            parser: SearchResultParser::new(
+                ".text-result-container>p",
+                ".text-result-container",
+                ".text-result-wrapper>a>h2",
+                ".text-result-wrapper>a",
+                ".text-result-wrapper>span",
+            )?,
+        })
+    }
+}
+
+#[async_trait::async_trait]
+impl SearchEngine for LibreX {
+    /// Retrieves search results from LibreX based on the provided query, page, user agent, and client.
+    ///
+    /// # Arguments
+    ///
+    /// * `query` - The search query.
+    /// * `page` - The page number for pagination.
+    /// * `user_agent` - The user agent string.
+    /// * `client` - The reqwest client for making HTTP requests.
+    /// * `_safe_search` - A parameter for safe search (not currently used).
+    ///
+    /// # Returns
+    ///
+    /// Returns a `Result` containing a `HashMap` of search results if successful, otherwise an `EngineError`.
+    /// The `Err` variant is explicit for better documentation.
+    async fn results(
+        &self,
+        query: &str,
+        page: u32,
+        user_agent: &str,
+        client: &Client,
+        _safe_search: u8,
+    ) -> Result<HashMap<String, SearchResult>, EngineError> {
+        // Page number can be missing or empty string and so appropriate handling is required
+        // so that upstream server recieves valid page number.
+        let url: String = match page {
+            1 | 0 => {
+                format!("https://search.ahwx.org/search.php?q={query}&p=0&t=10")
+            }
+            _ => {
+                format!(
+                    "https://search.ahwx.org/search.php?q={query}&p={}&t=10",
+                    page * 10,
+                )
+            }
+        };
+
+        // initializing HeaderMap and adding appropriate headers.
+        let header_map = HeaderMap::try_from(&HashMap::from([
+            ("USER_AGENT".to_string(), user_agent.to_string()),
+            ("REFERER".to_string(), "https://google.com/".to_string()),
+            ("CONTENT_TYPE".to_string(), "application/x-www-form-urlencoded".to_string()),
+            (
+                "COOKIE".to_string(),
+                "theme=amoled; disable_special=on; disable_frontends=on; language=en; number_of_results=10; safe_search=on; save=1".to_string(),
+            ),
+        ]))
+        .change_context(EngineError::UnexpectedError)?;
+
+        let document: Html = Html::parse_document(
+            &LibreX::fetch_html_from_upstream(self, &url, header_map, client).await?,
+        );
+
+        if self.parser.parse_for_no_results(&document).next().is_some() {
+            return Err(Report::new(EngineError::EmptyResultSet));
+        }
+
+        // scrape all the results from the html
+        self.parser
+            .parse_for_results(&document, |title, url, desc| {
+                Some(SearchResult::new(
+                    title.inner_html().trim(),
+                    url.inner_html().trim(),
+                    desc.inner_html().trim(),
+                    &["librex"],
+                ))
+            })
+    }
+}

src/engines/mod.rs

@@ -5,6 +5,7 @@
 
 pub mod brave;
 pub mod duckduckgo;
+pub mod librex;
 pub mod search_result_parser;
 pub mod searx;
 pub mod startpage;

src/models/engine_models.rs

@@ -158,6 +158,10 @@ impl EngineHandler {
                     let engine = crate::engines::startpage::Startpage::new()?;
                     ("startpage", Box::new(engine))
                 }
+                "librex" => {
+                    let engine = crate::engines::librex::LibreX::new()?;
+                    ("librex", Box::new(engine))
+                }
                 _ => {
                     return Err(Report::from(EngineError::NoSuchEngineFound(
                         engine_name.to_string(),

websurfx/config.lua

@@ -54,4 +54,5 @@ upstream_search_engines = {
     Searx = false,
     Brave = false,
     Startpage = false,
+    LibreX = false,
 } -- select the upstream search engines from which the results should be fetched.