Project gallery, webhook fixes, remove cache, re-enable donation URLs (#222)

src/util/ext.rs

@@ -0,0 +1,27 @@
+pub fn get_image_content_type(extension: &str) -> Option<&'static str> {
+    let content_type = match &*extension {
+        "bmp" => "image/bmp",
+        "gif" => "image/gif",
+        "jpeg" | "jpg" | "jpe" => "image/jpeg",
+        "png" => "image/png",
+        "svg" | "svgz" => "image/svg+xml",
+        "webp" => "image/webp",
+        "rgb" => "image/x-rgb",
+        "mp4" => "video/mp4",
+        _ => "",
+    };
+
+    if !content_type.is_empty() {
+        Some(content_type)
+    } else {
+        None
+    }
+}
+
+pub fn project_file_type(ext: &str) -> Option<&str> {
+    match ext {
+        "jar" => Some("application/java-archive"),
+        "zip" => Some("application/zip"),
+        _ => None,
+    }
+}

src/util/mod.rs

@@ -1,3 +1,4 @@
 pub mod auth;
+pub mod ext;
 pub mod validate;
 pub mod webhook;