better date parsing

backend/src/config.rs

@@ -1,6 +1,7 @@
 use anyhow::{Context, Result};
 use url::Url;
 
+use serde::de::Deserializer;
 use serde::Deserialize;
 use serde_aux::field_attributes::deserialize_bool_from_anything;
 
@@ -60,6 +61,16 @@ pub struct AppConfig {
     pub worker_max_document_bytes: u64,
     #[serde(default = "default_upload_body_limit_bytes")]
     pub upload_body_limit_bytes: u64,
+    #[serde(default = "default_service_timezone")]
+    pub service_timezone: String,
+    #[serde(default = "default_issued_at_date_order")]
+    pub issued_at_date_order: String,
+    #[serde(default)]
+    pub issued_at_filename_date_order: Option<String>,
+    #[serde(default, deserialize_with = "deserialize_string_list")]
+    pub issued_at_date_parser_locales: Vec<String>,
+    #[serde(default, deserialize_with = "deserialize_string_list")]
+    pub issued_at_ignore_dates: Vec<String>,
     #[serde(default)]
     pub webauthn_rp_id: Option<String>,
     #[serde(default)]
@@ -183,6 +194,52 @@ fn default_upload_body_limit_bytes() -> u64 {
     128 * 1024 * 1024
 }
 
+fn default_service_timezone() -> String {
+    "UTC".to_string()
+}
+
+fn default_issued_at_date_order() -> String {
+    "DMY".to_string()
+}
+
+fn deserialize_string_list<'de, D>(deserializer: D) -> Result<Vec<String>, D::Error>
+where
+    D: Deserializer<'de>,
+{
+    #[derive(Deserialize)]
+    #[serde(untagged)]
+    enum Helper {
+        List(Vec<String>),
+        Single(String),
+    }
+
+    let helper = Option::<Helper>::deserialize(deserializer)?;
+    let mut values = Vec::new();
+
+    if let Some(helper) = helper {
+        match helper {
+            Helper::List(list) => {
+                for entry in list {
+                    let trimmed = entry.trim();
+                    if !trimmed.is_empty() {
+                        values.push(trimmed.to_string());
+                    }
+                }
+            }
+            Helper::Single(value) => {
+                for part in value.split(',') {
+                    let trimmed = part.trim();
+                    if !trimmed.is_empty() {
+                        values.push(trimmed.to_string());
+                    }
+                }
+            }
+        }
+    }
+
+    Ok(values)
+}
+
 fn default_webauthn_rp_name() -> String {
     "Papercrate".to_string()
 }