use activitypub_federation::config::Data; use actix_web::web::Json; use lemmy_api_common::{ build_response::build_post_response, context::LemmyContext, post::{CreatePost, PostResponse}, request::fetch_link_metadata_opt, send_activity::{ActivityChannel, SendActivityData}, utils::{ check_community_user_action, generate_local_apub_endpoint, honeypot_check, local_site_to_slur_regex, mark_post_as_read, process_markdown_opt, proxy_image_link_opt_apub, EndpointType, }, }; use lemmy_db_schema::{ impls::actor_language::default_post_language, source::{ actor_language::CommunityLanguage, community::Community, local_site::LocalSite, post::{Post, PostInsertForm, PostLike, PostLikeForm, PostUpdateForm}, }, traits::{Crud, Likeable}, }; use lemmy_db_views::structs::LocalUserView; use lemmy_db_views_actor::structs::CommunityView; use lemmy_utils::{ error::{LemmyError, LemmyErrorExt, LemmyErrorType}, spawn_try_task, utils::{ slurs::check_slurs, validation::{check_url_scheme, clean_url_params, is_valid_body_field, is_valid_post_title}, }, }; use tracing::Instrument; use url::Url; use webmention::{Webmention, WebmentionError}; #[tracing::instrument(skip(context))] pub async fn create_post( data: Json, context: Data, local_user_view: LocalUserView, ) -> Result, LemmyError> { let local_site = LocalSite::read(&mut context.pool()).await?; let slur_regex = local_site_to_slur_regex(&local_site); check_slurs(&data.name, &slur_regex)?; let body = process_markdown_opt(&data.body, &slur_regex, &context).await?; honeypot_check(&data.honeypot)?; let data_url = data.url.as_ref(); let url = data_url.map(clean_url_params); // TODO no good way to handle a "clear" is_valid_post_title(&data.name)?; is_valid_body_field(&body, true)?; check_url_scheme(&data.url)?; check_community_user_action( &local_user_view.person, data.community_id, &mut context.pool(), ) .await?; let community_id = data.community_id; let community = Community::read(&mut context.pool(), community_id).await?; if community.posting_restricted_to_mods { let community_id = data.community_id; let is_mod = CommunityView::is_mod_or_admin( &mut context.pool(), local_user_view.local_user.person_id, community_id, ) .await?; if !is_mod { Err(LemmyErrorType::OnlyModsCanPostInCommunity)? } } // Fetch post links and pictrs cached image let metadata = fetch_link_metadata_opt(url.as_ref(), true, &context).await; let url = proxy_image_link_opt_apub(url, &context).await?; // Only need to check if language is allowed in case user set it explicitly. When using default // language, it already only returns allowed languages. CommunityLanguage::is_allowed_community_language( &mut context.pool(), data.language_id, community_id, ) .await?; // attempt to set default language if none was provided let language_id = match data.language_id { Some(lid) => Some(lid), None => { default_post_language( &mut context.pool(), community_id, local_user_view.local_user.id, ) .await? } }; let post_form = PostInsertForm::builder() .name(data.name.trim().to_string()) .url(url) .body(body) .community_id(data.community_id) .creator_id(local_user_view.person.id) .nsfw(data.nsfw) .embed_title(metadata.opengraph_data.title) .embed_description(metadata.opengraph_data.description) .embed_video_url(metadata.opengraph_data.embed_video_url) .language_id(language_id) .thumbnail_url(metadata.thumbnail) .build(); let inserted_post = Post::create(&mut context.pool(), &post_form) .await .with_lemmy_type(LemmyErrorType::CouldntCreatePost)?; let inserted_post_id = inserted_post.id; let protocol_and_hostname = context.settings().get_protocol_and_hostname(); let apub_id = generate_local_apub_endpoint( EndpointType::Post, &inserted_post_id.to_string(), &protocol_and_hostname, )?; let updated_post = Post::update( &mut context.pool(), inserted_post_id, &PostUpdateForm { ap_id: Some(apub_id), ..Default::default() }, ) .await .with_lemmy_type(LemmyErrorType::CouldntCreatePost)?; // They like their own post by default let person_id = local_user_view.person.id; let post_id = inserted_post.id; let like_form = PostLikeForm { post_id, person_id, score: 1, }; PostLike::like(&mut context.pool(), &like_form) .await .with_lemmy_type(LemmyErrorType::CouldntLikePost)?; ActivityChannel::submit_activity(SendActivityData::CreatePost(updated_post.clone()), &context) .await?; // Mark the post as read mark_post_as_read(person_id, post_id, &mut context.pool()).await?; if let Some(url) = updated_post.url.clone() { spawn_try_task(async move { let mut webmention = Webmention::new::(updated_post.ap_id.clone().into(), url.clone().into())?; webmention.set_checked(true); match webmention .send() .instrument(tracing::info_span!("Sending webmention")) .await { Err(WebmentionError::NoEndpointDiscovered(_)) => Ok(()), Ok(_) => Ok(()), Err(e) => Err(e).with_lemmy_type(LemmyErrorType::CouldntSendWebmention), } }); }; build_post_response(&context, community_id, &local_user_view.person, post_id).await }