feat: integrate EXIF data extraction using nom-exif and refactor related components

libertas_core/src/lib.rs

@@ -6,3 +6,4 @@ pub mod plugins;
 pub mod repositories;
 pub mod schema;
 pub mod services;
+pub mod media_utils;

libertas_core/src/media_utils.rs

@@ -0,0 +1,71 @@
+use std::path::Path;
+
+use chrono::{DateTime, NaiveDateTime, Utc};
+use nom_exif::{AsyncMediaParser, AsyncMediaSource, Exif, ExifIter, ExifTag};
+
+use crate::error::{CoreError, CoreResult};
+
+#[derive(Default, Debug)]
+pub struct ExtractedExif {
+    pub width: Option<i32>,
+    pub height: Option<i32>,
+    pub location: Option<String>,
+    pub date_taken: Option<DateTime<Utc>>,
+}
+
+fn parse_exif_datetime(s: &str) -> Option<DateTime<Utc>> {
+    NaiveDateTime::parse_from_str(s, "%Y:%m:%d %H:%M:%S")
+        .ok()
+        .map(|ndt| ndt.and_local_timezone(Utc).unwrap())
+}
+
+pub async fn extract_exif_data(file_path: &Path) -> CoreResult<ExtractedExif> {
+    let ms = AsyncMediaSource::file_path(file_path)
+        .await
+        .map_err(|e| CoreError::Unknown(format!("Failed to open file for EXIF: {}", e)))?;
+
+    if !ms.has_exif() {
+        return Ok(ExtractedExif::default());
+    }
+
+    let mut parser = AsyncMediaParser::new();
+    let iter: ExifIter = match parser.parse(ms).await {
+        Ok(iter) => iter,
+        Err(e) => {
+            println!("Could not parse EXIF: {}", e);
+            return Ok(ExtractedExif::default());
+        }
+    };
+
+    let location = iter.parse_gps_info().ok().flatten().map(|g| g.format_iso6709());
+    let exif: Exif = iter.into();
+
+    let width = exif
+        .get(ExifTag::ExifImageWidth)
+        .and_then(|f| f.as_u32())
+        .map(|v| v as i32);
+
+    let height = exif
+        .get(ExifTag::ExifImageHeight)
+        .and_then(|f| f.as_u32())
+        .map(|v| v as i32);
+
+    let dt_original = exif
+        .get(ExifTag::DateTimeOriginal)
+        .and_then(|f| f.as_str())
+        .and_then(parse_exif_datetime);
+    
+    let dt_modify = exif
+        .get(ExifTag::ModifyDate)
+        .and_then(|f| f.as_str())
+        .and_then(parse_exif_datetime);
+
+    let date_taken = dt_original.or(dt_modify);
+
+    Ok(ExtractedExif {
+        width,
+        height,
+        location,
+        date_taken,
+    })
+}