new: ✨ add a blank pages PDF document detection

Author: fharper

CHANGELOG.md

@@ -9,6 +9,7 @@
 ### Chg
 
 * ✨ Added pdf page number parameter for multi-pages pdfs
+* ✨ Added a blank pages only PDF detection & error raising
 
 
 ## v1.2.1 (2020-09-23)

mindee/inputs.py

@@ -55,10 +55,15 @@ def __init__(
         elif self.file_extension not in self.allowed_extensions:
             raise Exception("File type not allowed, must be in {%s}" % ", ".join(self.allowed_extensions))
 
-        if self.file_extension == "application/pdf" and cut_pdf is True:
+        if self.file_extension == "application/pdf":
             count_pages = self.count_pdf_pages()
-            if count_pages > 3:
-                self.merge_pdf_pages([0, count_pages - 2, count_pages - 1][:n_pdf_pages])
+
+            if cut_pdf is True:
+                if count_pages > 3:
+                    self.merge_pdf_pages([0, count_pages - 2, count_pages - 1][:n_pdf_pages])
+
+            self.check_if_document_is_empty(count_pages)
+
 
     @staticmethod
     def load(input_type, filename, filepath, file_extension):
@@ -120,3 +125,20 @@ def merge_pdf_pages(self, pages_number):
         self.file_object.close()
         self.file_object = io.BytesIO(doc.write())
 
+
+    def check_if_document_is_empty(self, pages_number):
+        """
+        :param pages_number: List of pages number to use for merging in the original pdf
+        :return: (void) Check if the document contain only empty pages
+        """
+
+        self.file_object.seek(0)
+        src = fitz.open(
+            stream=self.file_object.read(),
+            filetype="pdf"
+        )
+        fitz.open()
+        for page in src:
+            if len(page.getImageList()) > 0 or page.getText():
+                return
+        raise Exception("PDF pages are empty")