Collections (#688)

* initial draft; unfinished

* images, fixes

* fixes

* println

* revisions

* fixes

* alternate context setup version

* rev

* partial revs

* rev

* clippy ,fmt

* fmt/clippy/prepare

* fixes

* revs

src/util/img.rs

@@ -2,6 +2,11 @@ use color_thief::ColorFormat;
 use image::imageops::FilterType;
 use image::{EncodableLayout, ImageError};
 
+use crate::database;
+use crate::database::models::image_item;
+use crate::models::images::ImageContext;
+use crate::routes::ApiError;
+
 pub fn get_color_from_img(data: &[u8]) -> Result<Option<u32>, ImageError> {
     let image = image::load_from_memory(data)?
         .resize(256, 256, FilterType::Nearest)
@@ -13,3 +18,32 @@ pub fn get_color_from_img(data: &[u8]) -> Result<Option<u32>, ImageError> {
 
     Ok(color)
 }
+
+// check changes to associated images
+// if they no longer exist in the String list, delete them
+// Eg: if description is modified and no longer contains a link to an iamge
+pub async fn delete_unused_images(
+    context: ImageContext,
+    reference_strings: Vec<&str>,
+    transaction: &mut sqlx::Transaction<'_, sqlx::Postgres>,
+    redis: &deadpool_redis::Pool,
+) -> Result<(), ApiError> {
+    let uploaded_images = database::models::Image::get_many_contexted(context, transaction).await?;
+
+    for image in uploaded_images {
+        let mut should_delete = true;
+        for reference in &reference_strings {
+            if image.url.contains(reference) {
+                should_delete = false;
+                break;
+            }
+        }
+
+        if should_delete {
+            image_item::Image::remove(image.id, transaction, redis).await?;
+            image_item::Image::clear_cache(image.id, redis).await?;
+        }
+    }
+
+    Ok(())
+}