116 lines
2.5 KiB
Rust
116 lines
2.5 KiB
Rust
use pile_config::Label;
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use pile_io::SyncReadBridge;
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use std::{
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collections::HashMap,
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io::BufReader,
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sync::{Arc, OnceLock},
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};
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use tracing::trace;
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use crate::{
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extract::traits::{ExtractState, ObjectExtractor},
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value::{BinaryPileValue, PileValue},
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};
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pub struct ExifExtractor {
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item: BinaryPileValue,
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output: OnceLock<HashMap<Label, PileValue>>,
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}
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impl ExifExtractor {
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pub fn new(item: &BinaryPileValue) -> Self {
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Self {
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item: item.clone(),
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output: OnceLock::new(),
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}
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}
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async fn get_inner(&self) -> Result<&HashMap<Label, PileValue>, std::io::Error> {
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if let Some(x) = self.output.get() {
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return Ok(x);
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}
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let reader = SyncReadBridge::new_current(self.item.read().await?);
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let raw_fields = tokio::task::spawn_blocking(move || {
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let mut br = BufReader::new(reader);
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let exif = exif::Reader::new().read_from_container(&mut br)?;
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let fields: Vec<(String, String)> = exif
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.fields()
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.map(|f| {
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(
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f.tag.to_string(),
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f.display_value().with_unit(&exif).to_string(),
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)
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})
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.collect();
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Ok::<_, exif::Error>(fields)
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})
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.await?;
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let raw_fields = match raw_fields {
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Ok(x) => x,
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Err(exif::Error::Io(x)) => return Err(x),
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Err(error) => {
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trace!(message = "Could not process exif", ?error, item = ?self.item);
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return Ok(self.output.get_or_init(HashMap::new));
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}
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};
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let mut output: HashMap<Label, PileValue> = HashMap::new();
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for (tag_name, value) in raw_fields {
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let Some(label) = tag_to_label(&tag_name) else {
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continue;
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};
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// First occurrence wins (PRIMARY IFD comes before THUMBNAIL)
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output
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.entry(label)
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.or_insert_with(|| PileValue::String(Arc::new(value.into())));
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}
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return Ok(self.output.get_or_init(|| output));
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}
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}
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fn tag_to_label(tag: &str) -> Option<Label> {
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let sanitized: String = tag
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.chars()
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.map(|c| if c == ' ' { '_' } else { c })
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.filter(|c| Label::VALID_CHARS.contains(*c))
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.collect();
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Label::new(sanitized)
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}
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#[async_trait::async_trait]
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impl ObjectExtractor for ExifExtractor {
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async fn field(
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&self,
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state: &ExtractState,
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name: &Label,
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args: Option<&str>,
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) -> Result<Option<PileValue>, std::io::Error> {
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trace!(
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?args,
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item = ?self.item,
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"Getting field {name:?} from ExifExtractor",
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);
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if args.is_some() {
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return Ok(None);
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}
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if !state.ignore_mime && self.item.mime().type_() != mime::IMAGE {
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return Ok(None);
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}
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Ok(self.get_inner().await?.get(name).cloned())
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}
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async fn fields(&self) -> Result<Vec<Label>, std::io::Error> {
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Ok(self.get_inner().await?.keys().cloned().collect())
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}
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}
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