mirror of https://github.com/LemmyNet/lemmy.git
309 lines
8.9 KiB
Rust
309 lines
8.9 KiB
Rust
use crate::post::SiteMetadata;
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use encoding::{all::encodings, DecoderTrap};
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use lemmy_db_schema::newtypes::DbUrl;
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use lemmy_utils::{
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error::LemmyError,
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settings::structs::Settings,
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version::VERSION,
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REQWEST_TIMEOUT,
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};
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use percent_encoding::{utf8_percent_encode, NON_ALPHANUMERIC};
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use reqwest_middleware::ClientWithMiddleware;
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use serde::Deserialize;
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use tracing::info;
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use url::Url;
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use webpage::HTML;
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/// Fetches the post link html tags (like title, description, image, etc)
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#[tracing::instrument(skip_all)]
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pub async fn fetch_site_metadata(
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client: &ClientWithMiddleware,
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url: &Url,
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) -> Result<SiteMetadata, LemmyError> {
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info!("Fetching site metadata for url: {}", url);
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let response = client.get(url.as_str()).send().await?;
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// Can't use .text() here, because it only checks the content header, not the actual bytes
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// https://github.com/LemmyNet/lemmy/issues/1964
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let html_bytes = response.bytes().await.map_err(LemmyError::from)?.to_vec();
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let tags = html_to_site_metadata(&html_bytes)?;
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Ok(tags)
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}
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fn html_to_site_metadata(html_bytes: &[u8]) -> Result<SiteMetadata, LemmyError> {
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let html = String::from_utf8_lossy(html_bytes);
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// Make sure the first line is doctype html
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let first_line = html
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.trim_start()
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.lines()
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.next()
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.ok_or_else(|| LemmyError::from_message("No lines in html"))?
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.to_lowercase();
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if !first_line.starts_with("<!doctype html>") {
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return Err(LemmyError::from_message(
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"Site metadata page fetch is not DOCTYPE html",
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));
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}
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let mut page = HTML::from_string(html.to_string(), None)?;
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// If the web page specifies that it isn't actually UTF-8, re-decode the received bytes with the
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// proper encoding. If the specified encoding cannot be found, fall back to the original UTF-8
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// version.
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if let Some(charset) = page.meta.get("charset") {
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if charset.to_lowercase() != "utf-8" {
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if let Some(encoding_ref) = encodings().iter().find(|e| e.name() == charset) {
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if let Ok(html_with_encoding) = encoding_ref.decode(html_bytes, DecoderTrap::Replace) {
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page = HTML::from_string(html_with_encoding, None)?;
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}
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}
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}
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}
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let page_title = page.title;
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let page_description = page.description;
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let og_description = page
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.opengraph
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.properties
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.get("description")
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.map(std::string::ToString::to_string);
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let og_title = page
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.opengraph
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.properties
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.get("title")
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.map(std::string::ToString::to_string);
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let og_image = page
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.opengraph
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.images
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.first()
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.and_then(|ogo| Url::parse(&ogo.url).ok());
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let og_embed_url = page
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.opengraph
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.videos
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.first()
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.and_then(|v| Url::parse(&v.url).ok());
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Ok(SiteMetadata {
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title: og_title.or(page_title),
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description: og_description.or(page_description),
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image: og_image.map(Into::into),
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embed_video_url: og_embed_url.map(Into::into),
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})
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}
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#[derive(Deserialize, Debug, Clone)]
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pub(crate) struct PictrsResponse {
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files: Vec<PictrsFile>,
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msg: String,
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}
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#[derive(Deserialize, Debug, Clone)]
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pub(crate) struct PictrsFile {
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file: String,
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#[allow(dead_code)]
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delete_token: String,
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}
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#[derive(Deserialize, Debug, Clone)]
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pub(crate) struct PictrsPurgeResponse {
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msg: String,
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}
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#[tracing::instrument(skip_all)]
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pub(crate) async fn fetch_pictrs(
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client: &ClientWithMiddleware,
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settings: &Settings,
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image_url: &Url,
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) -> Result<PictrsResponse, LemmyError> {
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let pictrs_config = settings.pictrs_config()?;
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is_image_content_type(client, image_url).await?;
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let fetch_url = format!(
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"{}image/download?url={}",
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pictrs_config.url,
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utf8_percent_encode(image_url.as_str(), NON_ALPHANUMERIC) // TODO this might not be needed
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);
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let response = client
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.get(&fetch_url)
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.timeout(REQWEST_TIMEOUT)
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.send()
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.await?;
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let response: PictrsResponse = response.json().await.map_err(LemmyError::from)?;
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if response.msg == "ok" {
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Ok(response)
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} else {
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Err(LemmyError::from_message(&response.msg))
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}
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}
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/// Purges an image from pictrs
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/// Note: This should often be coerced from a Result to .ok() in order to fail softly, because:
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/// - It might fail due to image being not local
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/// - It might not be an image
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/// - Pictrs might not be set up
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pub async fn purge_image_from_pictrs(
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client: &ClientWithMiddleware,
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settings: &Settings,
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image_url: &Url,
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) -> Result<(), LemmyError> {
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let pictrs_config = settings.pictrs_config()?;
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is_image_content_type(client, image_url).await?;
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let alias = image_url
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.path_segments()
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.ok_or_else(|| LemmyError::from_message("Image URL missing path segments"))?
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.next_back()
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.ok_or_else(|| LemmyError::from_message("Image URL missing last path segment"))?;
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let purge_url = format!("{}/internal/purge?alias={}", pictrs_config.url, alias);
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let pictrs_api_key = pictrs_config
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.api_key
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.ok_or_else(|| LemmyError::from_message("pictrs_api_key_not_provided"))?;
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let response = client
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.post(&purge_url)
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.timeout(REQWEST_TIMEOUT)
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.header("x-api-token", pictrs_api_key)
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.send()
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.await?;
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let response: PictrsPurgeResponse = response.json().await.map_err(LemmyError::from)?;
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if response.msg == "ok" {
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Ok(())
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} else {
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Err(LemmyError::from_message(&response.msg))
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}
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}
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/// Both are options, since the URL might be either an html page, or an image
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/// Returns the SiteMetadata, and a Pictrs URL, if there is a picture associated
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#[tracing::instrument(skip_all)]
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pub async fn fetch_site_data(
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client: &ClientWithMiddleware,
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settings: &Settings,
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url: Option<&Url>,
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) -> (Option<SiteMetadata>, Option<DbUrl>) {
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match &url {
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Some(url) => {
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// Fetch metadata
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// Ignore errors, since it may be an image, or not have the data.
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// Warning, this may ignore SSL errors
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let metadata_option = fetch_site_metadata(client, url).await.ok();
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let missing_pictrs_file =
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|r: PictrsResponse| r.files.first().expect("missing pictrs file").file.clone();
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// Fetch pictrs thumbnail
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let pictrs_hash = match &metadata_option {
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Some(metadata_res) => match &metadata_res.image {
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// Metadata, with image
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// Try to generate a small thumbnail if there's a full sized one from post-links
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Some(metadata_image) => fetch_pictrs(client, settings, metadata_image)
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.await
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.map(missing_pictrs_file),
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// Metadata, but no image
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None => fetch_pictrs(client, settings, url)
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.await
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.map(missing_pictrs_file),
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},
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// No metadata, try to fetch the URL as an image
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None => fetch_pictrs(client, settings, url)
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.await
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.map(missing_pictrs_file),
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};
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// The full urls are necessary for federation
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let pictrs_thumbnail = pictrs_hash
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.map(|p| {
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Url::parse(&format!(
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"{}/pictrs/image/{}",
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settings.get_protocol_and_hostname(),
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p
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))
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.ok()
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})
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.ok()
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.flatten();
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(metadata_option, pictrs_thumbnail.map(Into::into))
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}
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None => (None, None),
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}
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}
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#[tracing::instrument(skip_all)]
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async fn is_image_content_type(client: &ClientWithMiddleware, url: &Url) -> Result<(), LemmyError> {
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let response = client.get(url.as_str()).send().await?;
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if response
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.headers()
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.get("Content-Type")
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.ok_or_else(|| LemmyError::from_message("No Content-Type header"))?
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.to_str()?
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.starts_with("image/")
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{
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Ok(())
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} else {
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Err(LemmyError::from_message("Not an image type."))
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}
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}
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pub fn build_user_agent(settings: &Settings) -> String {
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format!(
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"Lemmy/{}; +{}",
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VERSION,
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settings.get_protocol_and_hostname()
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)
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}
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#[cfg(test)]
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mod tests {
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use crate::request::{build_user_agent, fetch_site_metadata, SiteMetadata};
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use lemmy_utils::settings::SETTINGS;
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use url::Url;
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// These helped with testing
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#[tokio::test]
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async fn test_site_metadata() {
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let settings = &SETTINGS.clone();
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let client = reqwest::Client::builder()
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.user_agent(build_user_agent(settings))
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.build()
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.unwrap()
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.into();
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let sample_url = Url::parse("https://gitlab.com/IzzyOnDroid/repo/-/wikis/FAQ").unwrap();
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let sample_res = fetch_site_metadata(&client, &sample_url).await.unwrap();
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assert_eq!(
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SiteMetadata {
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title: Some("FAQ · Wiki · IzzyOnDroid / repo · GitLab".to_string()),
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description: Some(
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"The F-Droid compatible repo at https://apt.izzysoft.de/fdroid/".to_string()
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),
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image: Some(
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Url::parse("https://gitlab.com/uploads/-/system/project/avatar/4877469/iod_logo.png")
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.unwrap()
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.into()
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),
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embed_video_url: None,
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},
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sample_res
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);
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}
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// #[test]
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// fn test_pictshare() {
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// let res = fetch_pictshare("https://upload.wikimedia.org/wikipedia/en/2/27/The_Mandalorian_logo.jpg");
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// assert!(res.is_ok());
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// let res_other = fetch_pictshare("https://upload.wikimedia.org/wikipedia/en/2/27/The_Mandalorian_logo.jpgaoeu");
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// assert!(res_other.is_err());
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// }
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}
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