check if brand logo is a valid resource

filed/config/filed.toml.example

@@ -93,3 +93,14 @@ upload=false
 # Whether curlapi is enabled
 # curl {url}/curlapi/help for more info
 curlapi=true
+
+# Resources section
+
+# Define your resources like this: 
+# [resources."org.name.logo"]
+
+# Make sure that this path exists within the fileD filesystem
+# path="/some/place"
+
+# https://developer.mozilla.org/en-US/docs/Web/HTTP/Basics_of_HTTP/MIME_types/Common_types
+# mime="image/webp"

filed/src/config/resource/types.rs

@@ -19,6 +19,10 @@ impl ResourceCollection {
         }
         Ok(())
     }
+
+    pub fn get<T: Into<String>>(self: &Self, key: T) -> Option<&Resource> {
+        self.0.get(&key.into())
+    }
 }
 
 #[derive(Debug, Clone, Serialize, Deserialize)]

filed/src/config/types.rs

@@ -148,11 +148,14 @@ impl FilesPolicy {
 }
 
 impl Branding {
-    fn validate(self: &Self) -> Result<(), String> {
-        if let Some(logo_path) = self.custom_logo.clone() {
-            let logo_path = Path::new(&logo_path);
-            if ! logo_path.is_file() {
-                return Err("Config parameter branding.custom_logo is not a file. It must be a valid path that should be accessible from fileD's filesystem".into())
+    fn validate(self: &Self, conf: &Config) -> Result<(), String> {
+        if let Some(logo_id) = self.custom_logo.clone() {
+            if let Some(ref resources) = conf.resources {
+                if resources.get(&logo_id).is_none() {
+                    return Err(format!("Brand logo is set to a non existant resource ({logo_id})"));
+                }
+            } else {
+                return Err("Brand logo specified but no resources found".into())
             }
         }
         Ok(())
@@ -177,11 +180,11 @@ impl Config {
 
     pub fn validate(self: &Self) -> Result<(), String> {
         self.files.validate()?;
-        self.brand.validate()?;
         self.api  .validate()?;
         if let Some(resources) = self.resources.clone() {
             resources.validate()?;
         }
+        self.brand.validate(self)?;
 
         Ok(())
     }