Extract id3 covers

crates/pile-value/src/extract/blob/id3.rs

@@ -1,4 +1,5 @@
 use id3::Tag;
+use mime::Mime;
 use pile_config::Label;
 use pile_io::SyncReadBridge;
 use std::{
@@ -10,13 +11,98 @@ use std::{
 use tracing::trace;
 
 use crate::{
-	extract::traits::{ExtractState, ObjectExtractor},
-	value::{BinaryPileValue, PileValue},
+	extract::traits::{ExtractState, ListExtractor, ObjectExtractor},
+	value::{ArcBytes, BinaryPileValue, PileValue},
 };
 
+pub struct Id3ImagesExtractor {
+	item: BinaryPileValue,
+	cached_count: OnceLock<usize>,
+}
+
+impl Id3ImagesExtractor {
+	pub fn new(item: &BinaryPileValue) -> Self {
+		Self {
+			item: item.clone(),
+			cached_count: OnceLock::new(),
+		}
+	}
+
+	async fn read_tag(&self) -> Result<Option<Tag>, std::io::Error> {
+		let item = self.item.clone();
+		let reader = SyncReadBridge::new_current(self.item.read().await?);
+		tokio::task::spawn_blocking(move || match Tag::read_from2(BufReader::new(reader)) {
+			Ok(tag) => Ok(Some(tag)),
+			Err(id3::Error {
+				kind: id3::ErrorKind::Io(e),
+				..
+			}) => Err(e),
+			Err(error) => {
+				trace!(message = "Could not parse id3 tags", ?item, ?error);
+				Ok(None)
+			}
+		})
+		.await
+		.map_err(std::io::Error::other)?
+	}
+
+	fn mime_ok(&self, state: &ExtractState) -> bool {
+		state.ignore_mime || self.item.mime().essence_str() == "audio/mpeg"
+	}
+}
+
+#[async_trait::async_trait]
+impl ListExtractor for Id3ImagesExtractor {
+	async fn get(
+		&self,
+		state: &ExtractState,
+		idx: usize,
+	) -> Result<Option<PileValue>, std::io::Error> {
+		if !self.mime_ok(state) {
+			return Ok(None);
+		}
+
+		let Some(tag) = self.read_tag().await? else {
+			return Ok(None);
+		};
+
+		let Some(picture) = tag.pictures().nth(idx) else {
+			return Ok(None);
+		};
+
+		let mime: Mime = picture
+			.mime_type
+			.parse()
+			.unwrap_or(mime::APPLICATION_OCTET_STREAM);
+		let data = picture.data.clone();
+
+		Ok(Some(PileValue::Binary(BinaryPileValue::Blob {
+			mime,
+			bytes: ArcBytes(Arc::new(data)),
+		})))
+	}
+
+	async fn len(&self, state: &ExtractState) -> Result<usize, std::io::Error> {
+		if !self.mime_ok(state) {
+			return Ok(0);
+		}
+
+		if let Some(x) = self.cached_count.get() {
+			return Ok(*x);
+		}
+
+		let count = match self.read_tag().await? {
+			Some(tag) => tag.pictures().count(),
+			None => 0,
+		};
+		Ok(*self.cached_count.get_or_init(|| count))
+	}
+}
+
 pub struct Id3Extractor {
 	item: BinaryPileValue,
 	output: OnceLock<HashMap<Label, PileValue>>,
+	images: PileValue,
 }
 
 impl Id3Extractor {
@@ -24,6 +110,7 @@ impl Id3Extractor {
 		Self {
 			item: item.clone(),
 			output: OnceLock::new(),
+			images: PileValue::ListExtractor(Arc::new(Id3ImagesExtractor::new(item))),
 		}
 	}
 
@@ -134,10 +221,21 @@ impl ObjectExtractor for Id3Extractor {
 			return Ok(None);
 		}
 
+		if name.as_str() == "images" {
+			return Ok(Some(self.images.clone()));
+		}
+
 		Ok(self.get_inner().await?.get(name).cloned())
 	}
 
+	#[expect(clippy::unwrap_used)]
 	async fn fields(&self) -> Result<Vec<Label>, std::io::Error> {
-		Ok(self.get_inner().await?.keys().cloned().collect())
+		Ok(self
+			.get_inner()
+			.await?
+			.keys()
+			.cloned()
+			.chain([Label::new("images").unwrap()])
+			.collect::<Vec<_>>())
 	}
 }