UPDATE: Dump of initial files

xlsx/src/import/metadata.rs

@@ -0,0 +1,81 @@
+use std::io::Read;
+
+use ironcalc_base::types::Metadata;
+
+use crate::error::XlsxError;
+
+use super::util::get_value_or_default;
+
+struct AppData {
+    application: String,
+    app_version: String,
+}
+
+struct CoreData {
+    creator: String,
+    last_modified_by: String,
+    created: String,
+    last_modified: String,
+}
+
+fn load_core<R: Read + std::io::Seek>(
+    archive: &mut zip::read::ZipArchive<R>,
+) -> Result<CoreData, XlsxError> {
+    let mut file = archive.by_name("docProps/core.xml")?;
+    let mut text = String::new();
+    file.read_to_string(&mut text)?;
+    let doc = roxmltree::Document::parse(&text)?;
+    let core_data = doc
+        .root()
+        .first_child()
+        .ok_or_else(|| XlsxError::Xml("Corrupt XML structure".to_string()))?;
+    // Note the namespace should be "http://purl.org/dc/elements/1.1/"
+    let creator = get_value_or_default(&core_data, "creator", "Anonymous User");
+    // Note namespace is "http://schemas.openxmlformats.org/package/2006/metadata/core-properties"
+    let last_modified_by = get_value_or_default(&core_data, "lastModifiedBy", "Anonymous User");
+    // In these two cases the namespace is "http://purl.org/dc/terms/"
+    let created = get_value_or_default(&core_data, "created", "");
+    let last_modified = get_value_or_default(&core_data, "modified", "");
+
+    Ok(CoreData {
+        creator,
+        last_modified_by,
+        created,
+        last_modified,
+    })
+}
+
+fn load_app<R: Read + std::io::Seek>(
+    archive: &mut zip::read::ZipArchive<R>,
+) -> Result<AppData, XlsxError> {
+    let mut file = archive.by_name("docProps/app.xml")?;
+    let mut text = String::new();
+    file.read_to_string(&mut text)?;
+    let doc = roxmltree::Document::parse(&text)?;
+    let app_data = doc
+        .root()
+        .first_child()
+        .ok_or_else(|| XlsxError::Xml("Corrupt XML structure".to_string()))?;
+
+    let application = get_value_or_default(&app_data, "Application", "Unknown application");
+    let app_version = get_value_or_default(&app_data, "AppVersion", "");
+    Ok(AppData {
+        application,
+        app_version,
+    })
+}
+
+pub(super) fn load_metadata<R: Read + std::io::Seek>(
+    archive: &mut zip::read::ZipArchive<R>,
+) -> Result<Metadata, XlsxError> {
+    let app_data = load_app(archive)?;
+    let core_data = load_core(archive)?;
+    Ok(Metadata {
+        application: app_data.application,
+        app_version: app_data.app_version,
+        creator: core_data.creator,
+        last_modified_by: core_data.last_modified_by,
+        created: core_data.created,
+        last_modified: core_data.last_modified,
+    })
+}