Use timestamps in file names to fix caching issue

src/commands/challenge.rs

@@ -74,6 +74,7 @@ pub async fn submit(ctx: Context<'_>, submission: serenity::Attachment) -> Resul
 
     let challenge_number = get_challenge_number();
     let submission_images_dir = get_submission_images_dir();
+    let timestamp = std::time::SystemTime::now().duration_since(std::time::UNIX_EPOCH).unwrap().as_millis();
 
     // Ensure that submission_images_dir exists
     let path = Path::new(&submission_images_dir);
@@ -115,7 +116,7 @@ pub async fn submit(ctx: Context<'_>, submission: serenity::Attachment) -> Resul
                     i + 1,
                     slugify(&author.name),
                     author.discriminator,
-                    images.len() + 1,
+                    timestamp,
                     extension
                 );
                 images.push(file_name.clone().into());
@@ -154,15 +155,11 @@ pub async fn submit(ctx: Context<'_>, submission: serenity::Attachment) -> Resul
             }
             requires_rebuild = true;
             let file_name = format!(
-                "{}-{}-{}{}.{}",
+                "{}-{}-{}-{}.{}",
                 submission_data.len() + 1,
                 slugify(&author.name),
                 author.discriminator,
-                if images.len() == 0 {
-                    String::from("")
-                } else {
-                    format!("-{}", images.len() + 1)
-                },
+                timestamp,
                 extension
             );
             images.push(file_name.clone().into());
@@ -204,7 +201,6 @@ pub async fn submit(ctx: Context<'_>, submission: serenity::Attachment) -> Resul
             Some(data["invite"].as_str().unwrap())
         } else {
             None };
-        let timestamp = std::time::SystemTime::now().duration_since(std::time::UNIX_EPOCH).unwrap().as_millis();
         for image in submitted_images.iter() {
             for (other_guild_id, data) in guild_data.iter() {
                 let here = other_guild_id.eq(&ctx.guild_id().unwrap().as_u64().to_string());
@@ -374,43 +370,6 @@ pub async fn imagedelete(ctx: Context<'_>, number: i32) -> Result<(), Error> {
             submission_data.remove(i);
         } else {
             images.remove(index);
-            // One must rename all of the submitted images to prevent overwrites.
-            // Consider the following scenario:
-            // The submissions are ["bob-1234.png", "bob-1234-2.png"]
-            // Bob uses the command imageDelete 1
-            // The submissions become ["bob-1234-2.png"]
-            // Bob makes a second submission
-            // The submissions become ["bob-1234-2.png", "bob-1234-2.png"]
-            // The original bob-1234-2.png gets overwriten,
-            // and both submissions end up pointing to the same image.
-            // In order to prevent this, images need to be renamed according to their index.
-            for (j, image) in images.iter_mut().enumerate() {
-                let old = image.as_str().unwrap();
-                let from = format!("{}/{}", submission_images_dir, old);
-                let author = ctx.author();
-                let new = format!(
-                    "{}-{}-{}{}.{}",
-                    i + 1,
-                    slugify(&author.name),
-                    author.discriminator,
-                    if j == 0 {
-                        String::from("")
-                    } else {
-                        format!("-{}", j + 1)
-                    },
-                    Path::new(old).extension().unwrap().to_str().unwrap()
-                );
-                let to = format!("{}/{}", submission_images_dir, new);
-                if old.eq(&new) {
-                    // TODO: This could be made more efficient by
-                    // automatically starting iteration just after deleted image
-                    // since only images with later indexes will be affected
-                    continue;
-                }
-                fs_extra::file::move_file(from, to, &fs_extra::file::CopyOptions::default())
-                    .unwrap();
-                *image = new.into();
-            }
             submission["images"] = images.into();
         }
         set_submission_data(submission_data);