def appendAttachment(myPdfFileWriterObj, fname, fdata):
file_entry = DecodedStreamObject()
file_entry.setData(fdata)
file_entry.update({NameObject("/Type"): NameObject("/EmbeddedFile")})
efEntry = DictionaryObject()
efEntry.update({NameObject("/F"): file_entry})
filespec = DictionaryObject()
filespec.update({
NameObject("/Type"): NameObject("/Filespec"),
NameObject("/F"): createStringObject(fname),
NameObject("/EF"): efEntry
})
if "/Names" not in myPdfFileWriterObj._root_object.keys():
embeddedFilesNamesDictionary = DictionaryObject()
embeddedFilesNamesDictionary.update({
NameObject("/Names"):
ArrayObject([createStringObject(fname), filespec])
})
embeddedFilesDictionary = DictionaryObject()
embeddedFilesDictionary.update(
{NameObject("/EmbeddedFiles"): embeddedFilesNamesDictionary})
myPdfFileWriterObj._root_object.update(
{NameObject("/Names"): embeddedFilesDictionary})
else:
myPdfFileWriterObj._root_object["/Names"]["/EmbeddedFiles"][
"/Names"].append(createStringObject(fname))
myPdfFileWriterObj._root_object["/Names"]["/EmbeddedFiles"][
"/Names"].append(filespec)
def remove_watermark(wm_text, inputFile, outputFile):
from PyPDF4 import PdfFileReader, PdfFileWriter
from PyPDF4.pdf import ContentStream
from PyPDF4.generic import TextStringObject, NameObject
from PyPDF4.utils import b_
with open(inputFile, "rb") as f:
source = PdfFileReader(f, "rb")
output = PdfFileWriter()
for page in range(source.getNumPages()):
page = source.getPage(page)
content_object = page["/Contents"].getObject()
content = ContentStream(content_object, source)
for operands, operator in content.operations:
if operator == b_("Tj"):
text = operands[0]
if isinstance(text, str) and text.startswith(wm_text):
operands[0] = TextStringObject('')
page.__setitem__(NameObject('/Contents'), content)
output.addPage(page)
with open(outputFile, "wb") as outputStream:
output.write(outputStream)
def unwatermark_pdf(input_file: str, wm_text: str, pages: Tuple = None):
"""
Removes watermark from the pdf file.
"""
pdf_reader = PdfFileReader(open(input_file, 'rb'), strict=False)
pdf_writer = PdfFileWriter()
for page in range(pdf_reader.getNumPages()):
# If required for specific pages
if pages:
if str(page) not in pages:
continue
page = pdf_reader.getPage(page)
# Get the page content
content_object = page["/Contents"].getObject()
content = ContentStream(content_object, pdf_reader)
# Loop through all the elements page elements
for operands, operator in content.operations:
# Checks the TJ operator and replaces the corresponding string operand (Watermark text) with ''
if operator == b_("Tj"):
text = operands[0]
if isinstance(text, str) and text.startswith(wm_text):
operands[0] = TextStringObject('')
page.__setitem__(NameObject('/Contents'), content)
pdf_writer.addPage(page)
return True, pdf_reader, pdf_writer
def remove_noise(inputFile):
template_id = "TID" + str(uuid.uuid4().node)
outputFile = template_id + '.' + inputFile.split('.')[-1]
with open('./static/img/' + inputFile, "rb") as f:
source = PdfFileReader(f, "rb")
output = PdfFileWriter()
for page in range(source.getNumPages()):
page = source.getPage(page)
content_object = page["/Contents"].getObject()
content = ContentStream(content_object, source)
for operands, operator in content.operations:
if operator == b_("Tf") or operator == b_("Tj"):
operands[0] = TextStringObject('')
page.__setitem__(NameObject('/Contents'), content)
output.addPage(page)
# try:
with open('./static/template/' + outputFile, "wb") as outputStream:
output.write(outputStream)
return template_id
def _facturx_update_metadata_add_attachment(pdf_filestream,
facturx_xml_str,
pdf_metadata,
facturx_level,
output_intents=[],
additional_attachments={}):
'''This method is inspired from the code of the addAttachment()
method of the PyPDF2 lib'''
# The entry for the file
# facturx_xml_str = facturx_xml_str.encode('utf-8')
md5sum = hashlib.md5(facturx_xml_str).hexdigest()
md5sum_obj = createStringObject(md5sum)
params_dict = DictionaryObject({
NameObject('/CheckSum'):
md5sum_obj,
NameObject('/ModDate'):
createStringObject(_get_pdf_timestamp()),
NameObject('/Size'):
NameObject(str(len(facturx_xml_str))),
})
file_entry = DecodedStreamObject()
file_entry.setData(facturx_xml_str) # here we integrate the file itself
file_entry = file_entry.flateEncode()
file_entry.update({
NameObject("/Type"):
NameObject("/EmbeddedFile"),
NameObject("/Params"):
params_dict,
# 2F is '/' in hexadecimal
NameObject("/Subtype"):
NameObject("/text#2Fxml"),
})
file_entry_obj = pdf_filestream._addObject(file_entry)
# The Filespec entry
ef_dict = DictionaryObject({
NameObject("/F"): file_entry_obj,
NameObject('/UF'): file_entry_obj,
})
fname_obj = createStringObject(FACTURX_FILENAME)
filespec_dict = DictionaryObject({
NameObject("/AFRelationship"):
NameObject("/Data"),
NameObject("/Desc"):
createStringObject("Factur-X Invoice"),
NameObject("/Type"):
NameObject("/Filespec"),
NameObject("/F"):
fname_obj,
NameObject("/EF"):
ef_dict,
NameObject("/UF"):
fname_obj,
})
filespec_obj = pdf_filestream._addObject(filespec_dict)
name_arrayobj_cdict = {fname_obj: filespec_obj}
for attach_bin, attach_dict in additional_attachments.items():
_filespec_additional_attachments(pdf_filestream, name_arrayobj_cdict,
attach_dict, attach_bin)
name_arrayobj_content_sort = list(
sorted(name_arrayobj_cdict.items(), key=lambda x: x[0]))
name_arrayobj_content_final = []
af_list = []
for (fname_obj, filespec_obj) in name_arrayobj_content_sort:
name_arrayobj_content_final += [fname_obj, filespec_obj]
af_list.append(filespec_obj)
embedded_files_names_dict = DictionaryObject({
NameObject("/Names"):
ArrayObject(name_arrayobj_content_final),
})
# Then create the entry for the root, as it needs a
# reference to the Filespec
embedded_files_dict = DictionaryObject({
NameObject("/EmbeddedFiles"):
embedded_files_names_dict,
})
res_output_intents = []
for output_intent_dict, dest_output_profile_dict in output_intents:
dest_output_profile_obj = pdf_filestream._addObject(
dest_output_profile_dict)
# TODO detect if there are no other objects in output_intent_dest_obj
# than /DestOutputProfile
output_intent_dict.update({
NameObject("/DestOutputProfile"):
dest_output_profile_obj,
})
output_intent_obj = pdf_filestream._addObject(output_intent_dict)
res_output_intents.append(output_intent_obj)
# Update the root
metadata_xml_str = _prepare_pdf_metadata_xml(facturx_level, pdf_metadata)
metadata_file_entry = DecodedStreamObject()
metadata_file_entry.setData(metadata_xml_str)
metadata_file_entry = metadata_file_entry.flateEncode()
metadata_file_entry.update({
NameObject('/Subtype'): NameObject('/XML'),
NameObject('/Type'): NameObject('/Metadata'),
})
metadata_obj = pdf_filestream._addObject(metadata_file_entry)
af_value_obj = pdf_filestream._addObject(ArrayObject(af_list))
pdf_filestream._root_object.update({
NameObject("/AF"):
af_value_obj,
NameObject("/Metadata"):
metadata_obj,
NameObject("/Names"):
embedded_files_dict,
# show attachments when opening PDF
NameObject("/PageMode"):
NameObject("/UseAttachments"),
})
if res_output_intents:
pdf_filestream._root_object.update({
NameObject("/OutputIntents"):
ArrayObject(res_output_intents),
})
metadata_txt_dict = _prepare_pdf_metadata_txt(pdf_metadata)
pdf_filestream.addMetadata(metadata_txt_dict)
def _filespec_additional_attachments(pdf_filestream, name_arrayobj_cdict,
file_dict, file_bin):
filename = file_dict['filename']
mod_date_pdf = _get_pdf_timestamp(file_dict['mod_date'])
md5sum = hashlib.md5(file_bin).hexdigest()
md5sum_obj = createStringObject(md5sum)
params_dict = DictionaryObject({
NameObject('/CheckSum'):
md5sum_obj,
NameObject('/ModDate'):
createStringObject(mod_date_pdf),
NameObject('/Size'):
NameObject(str(len(file_bin))),
})
file_entry = DecodedStreamObject()
file_entry.setData(file_bin)
file_entry = file_entry.flateEncode()
file_mimetype = mimetypes.guess_type(filename)[0]
if not file_mimetype:
file_mimetype = 'application/octet-stream'
file_mimetype_insert = '/' + file_mimetype.replace('/', '#2f')
file_entry.update({
NameObject("/Type"): NameObject("/EmbeddedFile"),
NameObject("/Params"): params_dict,
NameObject("/Subtype"): NameObject(file_mimetype_insert),
})
file_entry_obj = pdf_filestream._addObject(file_entry)
ef_dict = DictionaryObject({
NameObject("/F"): file_entry_obj,
})
fname_obj = createStringObject(filename)
filespec_dict = DictionaryObject({
NameObject("/AFRelationship"):
NameObject("/Unspecified"),
NameObject("/Desc"):
createStringObject(file_dict.get('desc', '')),
NameObject("/Type"):
NameObject("/Filespec"),
NameObject("/F"):
fname_obj,
NameObject("/EF"):
ef_dict,
NameObject("/UF"):
fname_obj,
})
filespec_obj = pdf_filestream._addObject(filespec_dict)
name_arrayobj_cdict[fname_obj] = filespec_obj
def readPDF(inFileName, outFileName):
try:
PDFInputName = inFileName
PDFOutputName = outFileName
PDFInterimName = "output.pdf"
## Put a white ractangle on page 1
# Create a a borderless white rectangle
packet = io.BytesIO()
can = canvas.Canvas(packet, pagesize=letter)
can.setFillColorRGB(255, 255, 255)
can.rect(450, 550, 100, 40, fill=1, stroke=0)
can.save()
# set to beginning of bytestream and create a new PDF
packet.seek(0)
newPdf = PdfFileReader(packet)
interimOutput = PdfFileWriter()
with open(PDFInputName, 'rb') as fileStream:
existingPdf = PdfFileReader(fileStream)
# Get first Page and merge with rectangle
page = existingPdf.getPage(0)
page.mergePage(newPdf.getPage(0))
numPages = existingPdf.getNumPages()
for n in range(numPages):
interimOutput.addPage(existingPdf.getPage(n))
with open(PDFInterimName, "wb") as fileStream:
interimOutput.write(fileStream)
pdfWriter = PdfFileWriter()
with open(PDFInterimName, 'rb') as fileHandle:
# Read & extract Information
pdfReader = PdfFileReader(fileHandle)
pdfInfo = pdfReader.getDocumentInfo()
numPages = pdfReader.getNumPages()
PDFAllInfo = {
'author': pdfInfo.author,
'creator': pdfInfo.creator,
'producer': pdfInfo.producer,
'subject': pdfInfo.subject,
'title': pdfInfo.title,
'num_pages': numPages
}
# Get content in all pages
for pageNum in range(numPages):
# Get page
pageObject = pdfReader.getPage(pageNum)
# Get only the /Contents item in dictionary Eg : [IndirectObject(4, 0)]
pageContentsObject = pageObject['/Contents']
# Extract the elements fo the /Contents object as a contentstream (cant print this directly)
pageContent = ContentStream(
pageContentsObject,
pdfReader) # Check operands and operators
# Add page to pdf writer
pdfWriter.addPage(pageObject)
# loop through operators and operands in contents
for operands, operator in pageContent.operations:
if operator == b_("Tj") and operands == [
b'\x00C\x00O\x00P\x00Y\x00-\x00O\x00N\x00L\x00Y'
]:
operands[0] = TextStringObject('')
# Replace /Contents in pageObject
pageObject.__setitem__(NameObject('/Contents'), pageContent)
# Write to output file
with open(PDFOutputName, "wb") as outStream:
pdfWriter.write(outStream)
return (f"{PDFOutputName}")
except Exception as e:
exc_type, exc_obj, exc_tb = sys.exc_info()
fname = os.path.split(exc_tb.tb_frame.f_code.co_filename)[1]
print(f"{exc_type}, {exc_obj} , {fname} : {exc_tb.tb_lineno}")
