add max file size, allow rendering of images

src/utils/misc.rs

@@ -1,4 +1,4 @@
-use std::{fs, path::Path};
+use std::{fs, os::unix::fs::MetadataExt, path::Path};
 
 use actix_web::{
     http::header::{self, ContentType, TryIntoHeaderValue},
@@ -7,6 +7,7 @@ use actix_web::{
 };
 use base64::{engine::general_purpose, Engine};
 use cached::proc_macro::cached;
+use mime_guess::mime;
 use reqwest::Client;
 
 use crate::config::FileConfiguration;
@@ -63,14 +64,28 @@ pub fn read_file(filename: FilePath, expected_file: MType) -> Option<File> {
 #[cached(time = 600)]
 fn reader(filename: FilePath, expected_file: MType) -> Option<File> {
     let as_str = filename.to_string();
-    Path::new(&as_str)
-        .extension()
-        .and_then(|ext| match ext.to_str().unwrap() {
-            "pdf" => fs::read(&as_str).map_or(None, |bytes| Some(read_pdf(bytes))),
+    let path = Path::new(&as_str);
+
+    if let Ok(metadata) = path.metadata() {
+        // Taille maximale : 30M
+        if metadata.size() > 30 * 1000 * 1000 {
+            return None;
+        }
+    }
+
+    path.extension().and_then(|ext| {
+        match mime_guess::from_ext(ext.to_str().unwrap_or_default()).first_or_text_plain() {
+            mime if mime == mime::APPLICATION_PDF => {
+                fs::read(&as_str).map_or(None, |bytes| Some(read_pdf(bytes)))
+            }
+            mime if mime.type_() == mime::IMAGE => {
+                fs::read(&as_str).map_or(None, |bytes| Some(read_img(bytes, &mime)))
+            }
             _ => fs::read_to_string(&as_str).map_or(None, |text| {
                 Some(read_md(&filename, &text, expected_file, None, true))
             }),
-        })
+        }
+    })
 }
 
 fn read_pdf(data: Vec<u8>) -> File {
@@ -80,13 +95,23 @@ fn read_pdf(data: Vec<u8>) -> File {
         metadata: Metadata::default(),
         content: format!(
             r#"<embed
-                src="data:application/pdf;base64,{pdf}"
+                src="data:{};base64,{pdf}"
                 style="width: 100%; height: 79vh";
-            >"#
+            >"#,
+            mime::APPLICATION_PDF
         ),
     }
 }
 
+fn read_img(data: Vec<u8>, mime: &mime::Mime) -> File {
+    let image = general_purpose::STANDARD.encode(data);
+
+    File {
+        metadata: Metadata::default(),
+        content: format!("<img src='data:{mime};base64,{image}'>"),
+    }
+}
+
 /// Remove the first character of a string
 pub fn remove_first_letter(s: &str) -> &str {
     s.chars().next().map(|c| &s[c.len_utf8()..]).unwrap()