fix: share URL respects scheme in OXICLOUD_SERVER_HOST (#103)

When OXICLOUD_SERVER_HOST contains a full URL with scheme (e.g.
https://oxi.example.com), the share link no longer prepends
http:// or appends :port, avoiding malformed URLs like
http://https://host:8085/s/token.

- Add AppConfig::base_url() helper with smart URL construction
- Replace all 6 inline format!() calls in share_service.rs
- Replace inline construction in di.rs (admin settings base URL)
- Priority: OXICLOUD_BASE_URL > full-URL host > http://host:port

src/application/services/share_service.rs

@@ -158,7 +158,7 @@ impl ShareUseCase for ShareService {
             .map_err(|e| ShareServiceError::Repository(e.to_string()))?;
 
         // Convert the entity to DTO for the response
-        Ok(ShareDto::from_entity(&saved_share, &format!("http://{}:{}", self.config.server_host, self.config.server_port)))
+        Ok(ShareDto::from_entity(&saved_share, &self.config.base_url()))
     }
 
     async fn get_shared_link(&self, id: &str) -> Result<ShareDto, DomainError> {
@@ -175,7 +175,7 @@ impl ShareUseCase for ShareService {
         }
 
         // Convert the entity to DTO for the response
-        Ok(ShareDto::from_entity(&share, &format!("http://{}:{}", self.config.server_host, self.config.server_port)))
+        Ok(ShareDto::from_entity(&share, &self.config.base_url()))
     }
 
     async fn get_shared_link_by_token(&self, token: &str) -> Result<ShareDto, DomainError> {
@@ -192,7 +192,7 @@ impl ShareUseCase for ShareService {
         }
 
         // Convert the entity to DTO for the response
-        Ok(ShareDto::from_entity(&share, &format!("http://{}:{}", self.config.server_host, self.config.server_port)))
+        Ok(ShareDto::from_entity(&share, &self.config.base_url()))
     }
 
     async fn get_shared_links_for_item(
@@ -213,7 +213,7 @@ impl ShareUseCase for ShareService {
         // Convert the entities to DTOs for the response
         let share_dtos = active_shares
             .iter()
-            .map(|s| ShareDto::from_entity(s, &format!("http://{}:{}", self.config.server_host, self.config.server_port)))
+            .map(|s| ShareDto::from_entity(s, &self.config.base_url()))
             .collect();
 
         Ok(share_dtos)
@@ -264,7 +264,7 @@ impl ShareUseCase for ShareService {
             .map_err(|e| ShareServiceError::Repository(e.to_string()))?;
 
         // Convert the entity to DTO for the response
-        Ok(ShareDto::from_entity(&updated_share, &format!("http://{}:{}", self.config.server_host, self.config.server_port)))
+        Ok(ShareDto::from_entity(&updated_share, &self.config.base_url()))
     }
 
     async fn delete_shared_link(&self, id: &str) -> Result<(), DomainError> {
@@ -296,7 +296,7 @@ impl ShareUseCase for ShareService {
         // Convert the entities to DTOs
         let share_dtos: Vec<ShareDto> = shares
             .iter()
-            .map(|s| ShareDto::from_entity(s, &format!("http://{}:{}", self.config.server_host, self.config.server_port)))
+            .map(|s| ShareDto::from_entity(s, &self.config.base_url()))
             .collect();
 
         // Create the paginated result

src/common/config.rs

@@ -580,6 +580,28 @@ impl AppConfig {
     pub fn auth_enabled(&self) -> bool {
         self.features.enable_auth
     }
+
+    /// Build the public base URL for generating share links and other external URLs.
+    ///
+    /// Priority:
+    /// 1. `OXICLOUD_BASE_URL` env var (used as-is)
+    /// 2. If `server_host` already contains a scheme (`http://` or `https://`),
+    ///    treat it as a full origin and do **not** prepend a scheme or append a port.
+    /// 3. Otherwise, fall back to `http://{server_host}:{server_port}`.
+    pub fn base_url(&self) -> String {
+        if let Ok(explicit) = std::env::var("OXICLOUD_BASE_URL") {
+            return explicit.trim_end_matches('/').to_string();
+        }
+
+        let host = self.server_host.trim_end_matches('/');
+
+        if host.starts_with("http://") || host.starts_with("https://") {
+            // The user already provided a full origin — use it directly.
+            host.to_string()
+        } else {
+            format!("http://{}:{}", host, self.server_port)
+        }
+    }
 }
 
 /// Gets a default global configuration

src/common/di.rs

@@ -594,9 +594,7 @@ impl AppServiceFactory {
             let settings_repo = Arc::new(
                 crate::infrastructure::repositories::pg::SettingsPgRepository::new(pool.clone())
             );
-            let server_base_url = std::env::var("OXICLOUD_BASE_URL").unwrap_or_else(|_| {
-                format!("http://{}:{}", self.config.server_host, self.config.server_port)
-            });
+            let server_base_url = self.config.base_url();
 
             // Load OIDC config from env vars (the snapshot from startup)
             let env_oidc = crate::common::config::OidcConfig::from_env();