Use usize type for file sizes

src/activitypub/actors/helpers.rs

@@ -19,7 +19,7 @@ use crate::models::profiles::{
     },
 };
 
-const ACTOR_IMAGE_MAX_SIZE: u64 = 5 * 1000 * 1000; // 5 MB
+const ACTOR_IMAGE_MAX_SIZE: usize = 5 * 1000 * 1000; // 5 MB
 
 async fn fetch_actor_images(
     instance: &Instance,

src/activitypub/fetcher/fetchers.rs

@@ -108,7 +108,7 @@ pub async fn fetch_file(
     instance: &Instance,
     url: &str,
     maybe_media_type: Option<&str>,
-    file_max_size: u64,
+    file_max_size: usize,
     output_dir: &Path,
 ) -> Result<(String, Option<String>), FetchError> {
     let client = build_client(instance)?;
@@ -116,12 +116,14 @@ pub async fn fetch_file(
         build_request(instance, client, Method::GET, url);
     let response = request_builder.send().await?.error_for_status()?;
     if let Some(file_size) = response.content_length() {
+        let file_size: usize = file_size.try_into()
+            .expect("value should be within bounds");
         if file_size > file_max_size {
             return Err(FetchError::OtherError("file is too large"));
         };
     };
     let file_data = response.bytes().await?;
-    if file_data.len() > file_max_size as usize {
+    if file_data.len() > file_max_size {
         return Err(FetchError::OtherError("file is too large"));
     };
     let maybe_media_type = maybe_media_type

src/activitypub/handlers/create.rs

@@ -142,7 +142,7 @@ fn get_note_visibility(
     Visibility::Direct
 }
 
-const ATTACHMENT_MAX_SIZE: u64 = 20 * 1000 * 1000;
+const ATTACHMENT_MAX_SIZE: usize = 20 * 1000 * 1000; // 20 MB
 
 fn is_gnu_social_link(author_id: &str, attachment: &Attachment) -> bool {
     if !author_id.contains("/index.php/user/") {

src/models/posts/validators.rs

@@ -2,7 +2,7 @@ use crate::errors::ValidationError;
 use crate::utils::html::clean_html_strict;
 
 pub const ATTACHMENTS_MAX_NUM: usize = 15;
-pub const EMOJI_MAX_SIZE: u64 = 250 * 1000; // 250 kB
+pub const EMOJI_MAX_SIZE: usize = 250 * 1000; // 250 kB
 pub const EMOJI_MEDIA_TYPES: [&str; 2] = [
     "image/gif",
     "image/png",