Multiple enhancements and bugfixes

!Breaking change! - The updated version will not be able to read your old database file

Major improvements:
- Added editable pastas
- Added private pastas
- Added line numbers
- Added support for wide mode (1080p instead of 720p)
- Added syntax highlighting support
- Added read-only mode
- Added built-in help page
- Added option to remove logo, change title and footer text

Minor improvements:
- Improved looks in pure html mode
- Removed link to GitHub repo from navbar
- Broke up 7km long main.rs file into smaller modules
- Moved water.css into a template instead of serving it as an external resource
- Made Save button a bit bigger
- Updated README.MD

Bugfixes:
- Fixed a bug where an incorrect animal ID in a request would cause a crash
- Fixed a bug where an empty or corrupt JSON database would cause a crash

src/util/auth.rs

@@ -0,0 +1,29 @@
+use actix_web::dev::ServiceRequest;
+use actix_web::{error, Error};
+use actix_web_httpauth::extractors::basic::BasicAuth;
+
+use crate::args::ARGS;
+
+pub async fn auth_validator(
+    req: ServiceRequest,
+    credentials: BasicAuth,
+) -> Result<ServiceRequest, Error> {
+    // check if username matches
+    if credentials.user_id().as_ref() == ARGS.auth_username.as_ref().unwrap() {
+        return match ARGS.auth_password.as_ref() {
+            Some(cred_pass) => match credentials.password() {
+                None => Err(error::ErrorBadRequest("Invalid login details.")),
+                Some(arg_pass) => {
+                    if arg_pass == cred_pass {
+                        Ok(req)
+                    } else {
+                        Err(error::ErrorBadRequest("Invalid login details."))
+                    }
+                }
+            },
+            None => Ok(req),
+        };
+    } else {
+        Err(error::ErrorBadRequest("Invalid login details."))
+    }
+}