lemmy/crates/apub/src/objects/mod.rs

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use crate::protocol::Source;
use activitypub_federation::{
config::Data,
fetch::object_id::ObjectId,
protocol::values::MediaTypeMarkdownOrHtml,
traits::Object,
};
use anyhow::anyhow;
use html2md::parse_html;
use lemmy_api_common::context::LemmyContext;
use lemmy_utils::error::LemmyResult;
use serde::Deserialize;
use std::fmt::Debug;
pub mod comment;
pub mod community;
pub mod instance;
pub mod person;
pub mod post;
pub mod private_message;
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pub(crate) fn read_from_string_or_source(
content: &str,
media_type: &Option<MediaTypeMarkdownOrHtml>,
source: &Option<Source>,
) -> String {
if let Some(s) = source {
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// markdown sent by lemmy in source field
s.content.clone()
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} else if media_type == &Some(MediaTypeMarkdownOrHtml::Markdown) {
// markdown sent by peertube in content field
content.to_string()
} else {
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// otherwise, convert content html to markdown
parse_html(content)
}
}
pub(crate) fn read_from_string_or_source_opt(
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content: &Option<String>,
media_type: &Option<MediaTypeMarkdownOrHtml>,
source: &Option<Source>,
) -> Option<String> {
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content
.as_ref()
.map(|content| read_from_string_or_source(content, media_type, source))
}
/// When for example a Post is made in a remote community, the community will send it back,
/// wrapped in Announce. If we simply receive this like any other federated object, overwrite the
/// existing, local Post. In particular, it will set the field local = false, so that the object
/// can't be fetched from the Activitypub HTTP endpoint anymore (which only serves local objects).
pub(crate) fn verify_is_remote_object<T>(
id: &ObjectId<T>,
context: &Data<LemmyContext>,
) -> LemmyResult<()>
where
T: Object<DataType = LemmyContext> + Debug + Send + 'static,
for<'de2> <T as Object>::Kind: Deserialize<'de2>,
{
if id.is_local(context) {
Err(anyhow!("cant accept local object from remote instance").into())
} else {
Ok(())
}
}