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//! The `brave` module handles the scraping of results from the brave search engine
//! by querying the upstream brave search engine with user provided query and with a page
//! number if provided.
use std::collections::HashMap;
use reqwest::{header::HeaderMap, Client};
use scraper::Html;
use crate::models::aggregation_models::SearchResult;
use error_stack::{Report, Result, ResultExt};
use crate::models::engine_models::{EngineError, SearchEngine};
use super::search_result_parser::SearchResultParser;
/// Scrapes the results from the Brave search engine.
pub struct Brave {
/// Utilises generic logic for parsing search results.
parser: SearchResultParser,
}
impl Brave {
/// Creates the Brave parser.
pub fn new() -> Result<Brave, EngineError> {
Ok(Self {
parser: SearchResultParser::new(
"#results h4",
"#results [data-pos]",
"a > .url",
"a",
".snippet-description",
)?,
})
}
}
#[async_trait::async_trait]
impl SearchEngine for Brave {
async fn results(
&self,
query: &str,
page: u32,
user_agent: &str,
client: &Client,
safe_search: u8,
) -> Result<HashMap<String, SearchResult>, EngineError> {
let url = format!("https://search.brave.com/search?q={query}&offset={page}");
let safe_search_level = match safe_search {
0 => "off",
1 => "moderate",
_ => "strict",
};
let header_map = HeaderMap::try_from(&HashMap::from([
("USER_AGENT".to_string(), user_agent.to_string()),
(
"CONTENT_TYPE".to_string(),
"application/x-www-form-urlencoded".to_string(),
),
("REFERER".to_string(), "https://google.com/".to_string()),
(
"COOKIE".to_string(),
format!("safe_search={safe_search_level}"),
),
]))
.change_context(EngineError::UnexpectedError)?;
let document: Html = Html::parse_document(
&Brave::fetch_html_from_upstream(self, &url, header_map, client).await?,
);
if let Some(no_result_msg) = self.parser.parse_for_no_results(&document).nth(0) {
if no_result_msg
.inner_html()
.contains("Not many great matches came back for your search")
{
return Err(Report::new(EngineError::EmptyResultSet));
}
}
self.parser
.parse_for_results(&document, |title, url, desc| {
url.value().attr("href").map(|url| {
SearchResult::new(
title.text().collect::<Vec<_>>().join("").trim(),
url.trim(),
desc.inner_html().trim(),
&["brave"],
)
})
})
}
}
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