Implement 'move to subdir' logic & store in settings

Fixes #251 by implementing the logic for archiving a document after
conversion into a default sub-directory.

dangerzone/container.py

@@ -282,6 +282,9 @@ def convert(
             )
             shutil.move(container_output_filename, document.output_filename)
 
+            if document.archive_after_conversion:
+                document.archive()
+
             # We did it
             success = True
 

dangerzone/document.py

@@ -13,6 +13,7 @@ import appdirs
 from . import errors
 
 SAFE_EXTENSION = "-safe.pdf"
+ARCHIVE_SUBDIR = "unsafe"
 
 log = logging.getLogger(__name__)
 
@@ -35,12 +36,14 @@ class Document:
         input_filename: str = None,
         output_filename: str = None,
         suffix: str = SAFE_EXTENSION,
+        archive: bool = False,
     ) -> None:
         # NOTE: See https://github.com/freedomofpress/dangerzone/pull/216#discussion_r1015449418
         self.id = secrets.token_urlsafe(6)[0:6]
 
         self._input_filename: Optional[str] = None
         self._output_filename: Optional[str] = None
+        self._archive = False
         self._suffix = suffix
 
         if input_filename:
@@ -51,6 +54,8 @@ class Document:
 
         self.state = Document.STATE_UNCONVERTED
 
+        self.archive_after_conversion = archive
+
     @staticmethod
     def normalize_filename(filename: str) -> str:
         return os.path.abspath(filename)
@@ -113,6 +118,33 @@ class Document:
         else:
             raise errors.SuffixNotApplicableException()
 
+    @property
+    def archive_after_conversion(self) -> bool:
+        return self._archive
+
+    @archive_after_conversion.setter
+    def archive_after_conversion(self, enabled: bool) -> None:
+        if enabled:
+            self._archive = True
+        else:
+            self._archive = False
+
+    def archive(self) -> None:
+        """
+        Moves the original document to a subdirectory. Prevents the user from
+        mistakenly opening the unsafe (original) document.
+        """
+        archive_dir = self.default_archive_dir
+        old_file_path = Path(self.input_filename)
+        new_file_path = archive_dir / old_file_path.name
+        log.debug(f"Archiving doc {self.id} to {new_file_path}")
+        Path.mkdir(archive_dir, exist_ok=True)
+        old_file_path.rename(new_file_path)
+
+    @property
+    def default_archive_dir(self) -> Path:
+        return Path(self.input_filename).parent / ARCHIVE_SUBDIR
+
     @property
     def default_output_filename(self) -> str:
         return f"{os.path.splitext(self.input_filename)[0]}{self.suffix}"

dangerzone/gui/main_window.py

@@ -355,9 +355,8 @@ class SettingsWidget(QtWidgets.QWidget):
         save_group_box_layout.setContentsMargins(20, 0, 0, 0)
         save_group_box_layout.addWidget(save_group_box)
         self.radio_move_untrusted = QtWidgets.QRadioButton(
-            "Move unsafe PDFs to 'unsafe' subdirectory"
+            "Move original documents to 'unsafe' subdirectory"
         )
-        self.radio_move_untrusted.setChecked(True)
         save_group_box_innner_layout.addWidget(self.radio_move_untrusted)
         self.radio_save_to = QtWidgets.QRadioButton()
         self.save_label.clicked.connect(
@@ -433,6 +432,11 @@ class SettingsWidget(QtWidgets.QWidget):
         else:
             self.safe_extension.setText(SAFE_EXTENSION)
 
+        if self.dangerzone.settings.get("archive"):
+            self.radio_move_untrusted.setChecked(True)
+        else:
+            self.radio_save_to.setChecked(True)
+
         if self.dangerzone.settings.get("ocr"):
             self.ocr_checkbox.setCheckState(QtCore.Qt.Checked)
         else:
@@ -524,23 +528,29 @@ class SettingsWidget(QtWidgets.QWidget):
                 self.save_location.setText(selected_dir)
 
     def start_button_clicked(self) -> None:
-        if self.save_checkbox.checkState() == QtCore.Qt.Unchecked:
-            # If not saving, then save it to a temp file instead
-            for document in self.dangerzone.get_unconverted_documents():
-                (_, tmp) = tempfile.mkstemp(suffix=".pdf", prefix="dangerzone_")
-                document.output_filename = tmp
-        else:
         for document in self.dangerzone.get_unconverted_documents():
+            if self.save_checkbox.isChecked():
+                # If we're saving the document, set the suffix that the user chose. Then
+                # check if we should to store the document in the same directory, and
+                # move the original document to an 'unsafe' subdirectory, or save the
+                # document to another directory.
                 document.suffix = self.safe_extension.text()
-
+                if self.radio_move_untrusted.isChecked():
+                    document.archive_after_conversion = True
+                elif self.radio_save_to.isChecked():
                     if self.output_dir:
                         document.set_output_dir(self.output_dir)  # type: ignore [unreachable]
+            else:
+                # If not saving, then save it to a temp file instead
+                (_, tmp) = tempfile.mkstemp(suffix=".pdf", prefix="dangerzone_")
+                document.output_filename = tmp
 
         # Update settings
         self.dangerzone.settings.set(
             "save", self.save_checkbox.checkState() == QtCore.Qt.Checked
         )
         self.dangerzone.settings.set("safe_extension", self.safe_extension.text())
+        self.dangerzone.settings.set("archive", self.radio_move_untrusted.isChecked())
         self.dangerzone.settings.set(
             "ocr", self.ocr_checkbox.checkState() == QtCore.Qt.Checked
         )

dangerzone/settings.py

@@ -21,6 +21,7 @@ class Settings:
         )
         self.default_settings: Dict[str, Any] = {
             "save": True,
+            "archive": True,
             "ocr": True,
             "ocr_language": "English",
             "open": True,