def _create_pdf_attachment(attachment, url_fetcher):
"""
Create an attachment to the PDF stream
:return:
the object representing the ``/Filespec`` object or :obj:`None` if the
attachment couldn't be read.
"""
try:
# Attachments from document links like <link> or <a> can only be URLs.
# They're passed in as tuples
if isinstance(attachment, tuple):
url, description = attachment
attachment = Attachment(url=url,
url_fetcher=url_fetcher,
description=description)
elif not isinstance(attachment, Attachment):
attachment = Attachment(guess=attachment, url_fetcher=url_fetcher)
with attachment.source as (source_type, source, url, _):
if isinstance(source, bytes):
source = io.BytesIO(source)
pdf_file_object = _create_compressed_file_object(source)
except URLFetchingError as exc:
LOGGER.error('Failed to load attachment: %s', exc)
return None
# TODO: Use the result object from a URL fetch operation to provide more
# details on the possible filename
return PdfDict(Type=PdfName('Filespec'),
F=PdfString.encode(''),
UF=PdfString.encode(_get_filename_from_result(url, None)),
EF=PdfDict(F=pdf_file_object),
Desc=PdfString.encode(attachment.description or ''))
def popup_bg_links(show_ocmd, ocgs):
from pdfrw import PdfDict, PdfArray, PdfName
if not pdf_popup_config['backgroundlink']: return
if pdf_popup_config['backgroundlink'] not in ('front', 'back'):
raise ValueError(
"pdf_popup_config['backgroundlink'] must be front or back or None")
for page in popup_pdf.pages:
rect = page.MediaBox
if pdf_popup_config['backgroundlink-debug']: rect = [90, 800, 180, 200]
link = PdfDict(
indirect=True,
Type=PdfName.Annot,
H=PdfName.N,
Subtype=PdfName.Link,
Rect=rect,
#F=2, # Link is hidden
Border=[0, 0, 10]
if pdf_popup_config['backgroundlink-debug'] else [0, 0, 0],
C=[1, 0, 0] if pdf_popup_config['backgroundlink-debug'] else None,
OC=show_ocmd,
A=PdfDict(S=PdfName.SetOCGState,
State=PdfArray([PdfName.OFF] + ocgs)),
)
if page.Annots == None: page.Annots = PdfArray()
if pdf_popup_config['backgroundlink'] == 'back':
page.Annots.insert(0, link)
elif pdf_popup_config['backgroundlink'] == 'front':
page.Annots.append(link)
else:
raise RuntimeException("Unexpected value")
def _create_compressed_file_object(source):
"""
Create a file like object as ``/EmbeddedFile`` compressing it with deflate.
:return:
the object representing the compressed file stream object
"""
md5 = hashlib.md5()
compress = zlib.compressobj()
pdf_file_object = PdfDict(Type=PdfName('EmbeddedFile'),
Filter=PdfName('FlateDecode'))
# pdfrw needs Latin-1-decoded unicode strings in object.stream
pdf_file_object.stream = ''
size = 0
for data in iter(lambda: source.read(4096), b''):
size += len(data)
md5.update(data)
pdf_file_object.stream += compress.compress(data).decode('latin-1')
pdf_file_object.stream += compress.flush(zlib.Z_FINISH).decode('latin-1')
pdf_file_object.Params = PdfDict(CheckSum=PdfString('<{}>'.format(
md5.hexdigest())),
Size=size)
return pdf_file_object
def write_fillable_pdf(self, input_pdf_path, output_pdf_path, data_dict):
template_pdf = PdfReader(input_pdf_path)
for index, _ in enumerate(template_pdf.pages):
annotations = template_pdf.pages[index][self.ANNOT_KEY]
if hasattr(annotations, "__len__"):
for annotation in annotations:
if annotation[self.SUBTYPE_KEY] == self.WIDGET_SUBTYPE_KEY:
if self.ANNOT_FIELD_KEY in annotation:
key = annotation[self.ANNOT_FIELD_KEY][1:-1]
if key in data_dict.keys():
value = data_dict[key]
if annotation["/FT"] == "/Tx":
if value != "-":
annotation.update(
PdfDict(
V='{}'.format(value.upper())))
elif annotation[
"/FT"] == "/Btn" and value == "Yes":
annotation.update(
PdfDict(V=objects.pdfname.BasePdfName(
'/Yes')))
annotation.update(PdfDict(Ff=1))
template_pdf.Root.AcroForm.update(
PdfDict(NeedAppearances=PdfObject('true')))
PdfWriter().write(output_pdf_path, template_pdf)
def fixpage(page, watermark):
# Find the page's resource dictionary. Create if none
resources = page.inheritable.Resources
if resources is None:
resources = page.Resources = PdfDict()
# Find or create the parent's xobject dictionary
xobjdict = resources.XObject
if xobjdict is None:
xobjdict = resources.XObject = PdfDict()
# Allow for an infinite number of cascaded watermarks
index = 0
while 1:
watermark_name = '/Watermark.%d' % index
if watermark_name not in xobjdict:
break
index += 1
xobjdict[watermark_name] = watermark
# Turn the contents into an array if it is not already one
contents = page.Contents
if not isinstance(contents, PdfArray):
contents = page.Contents = PdfArray([contents])
# Save initial state before executing page
contents.insert(0, IndirectPdfDict(stream='q\n'))
# Restore initial state and append the watermark
contents.append(IndirectPdfDict(stream='Q %s Do\n' % watermark_name))
return page
def fill_form(input_file, output_file, data):
"""input_file can be file object or path name
output_file can be file object or path name
data is dictionary with keys corresponding to the form fields"""
the_pdf = PdfReader(input_file)
for page in the_pdf.pages:
annotations = page[ANNOT_KEY]
for annotation in annotations:
if annotation[SUBTYPE_KEY] == WIDGET_SUBTYPE_KEY:
key = annotation[ANNOT_FIELD_KEY][1:-1]
if key in data.keys():
val = data[key]
if val == None:
# skip nulls
continue
if val == True:
# treat booleans as checkboxes
annotation.update(PdfDict(V=PdfName("On")))
else:
# set annotation value
annotation.update(PdfDict(V="{}".format(val)))
# and empty appearance to make field visible in Apple Preview
annotation.update(PdfDict(AP=""))
# mark the fields as un-editable
annotation.update(PdfDict(Ff=1))
# set NeedAppearances to ensure the fields are visible in Adobe Reader
if the_pdf.Root.AcroForm:
the_pdf.Root.AcroForm.update(
PdfDict(NeedAppearances=PdfObject("true")))
PdfWriter().write(output_file, the_pdf)
def fixpage(*pages):
pages = [pagexobj(x) for x in pages]
class PageStuff(tuple):
pass
x = y = 0
for i, page in enumerate(pages):
index = '/P%s' % i
shift_right = x and '1 0 0 1 %s 0 cm ' % x or ''
stuff = PageStuff((index, page))
stuff.stream = 'q %s%s Do Q\n' % (shift_right, index)
x += page.BBox[2]
y = max(y, page.BBox[3])
pages[i] = stuff
# Multiple copies of first page used as a placeholder to
# get blank page on back.
for p1, p2 in zip(pages, pages[1:]):
if p1[1] is p2[1]:
pages.remove(p1)
return IndirectPdfDict(
Type=PdfName.Page,
Contents=PdfDict(stream=''.join(page.stream for page in pages)),
MediaBox=PdfArray([0, 0, x, y]),
Resources=PdfDict(XObject=PdfDict(pages), ),
)
def generate_pdf_outline(pdf, contents, parent=None):
if parent is None:
parent = PdfDict(indirect=True)
if not contents:
return parent
first = prev = None
for k, row in enumerate(contents):
page = pdf.writer.pagearray[int(row['pnum'])-1]
bookmark = PdfDict(
Parent=parent,
Title=row['label'],
A=PdfDict(
D=[page, PdfName.Fit],
S=PdfName.GoTo
),
indirect=True
)
children = row.get('children')
if children:
bookmark = generate_pdf_outline(pdf, children, bookmark)
if first:
bookmark[PdfName.Prev] = prev
prev[PdfName.Next] = bookmark
else:
first = bookmark
prev = bookmark
parent[PdfName.Count] = k + 1
parent[PdfName.First] = first
parent[PdfName.Last] = prev
return parent
def pdfobjs(self):
"""Returns a tuple of two elements to insert in the PageLabels.Nums
entry of a pdf"""
page_num = PdfObject(self.startpage)
opts = PdfDict(S=styles[self.style])
if self.prefix != defaults["prefix"]:
opts.P = PdfString.encode(self.prefix)
if self.firstpagenum != defaults["firstpagenum"]:
opts.St = PdfObject(self.firstpagenum)
return page_num, opts
def pdfobjs(self):
"""Returns a tuple of two elements to insert in the PageLabels.Nums
entry of a pdf"""
pagenum = PdfObject(self.startpage)
opts = PdfDict(S=styles[self.style])
if self.prefix != defaults["prefix"]:
opts.P = PdfString.encode(self.prefix)
if self.firstpagenum != defaults["firstpagenum"]:
opts.St = PdfObject(self.firstpagenum)
return (pagenum, opts)
def make_image_xobject(image):
"""Construct a PdfDict representing the Image XObject, for inserting
into the AP Resources dict.
PNGs and GIFs are treated equally - the raw sample values are included
using PDF's FlateDecode compression format. JPEGs can be included in
their original form using the DCTDecode filter.
PNGs with transparency have the alpha channel split out and included as
an SMask, since PDFs don't natively support transparent PNGs.
Details about file formats and allowed modes can be found at
https://pillow.readthedocs.io/en/5.3.x/handbook/image-file-formats.html
:param str|ImageFile image: Either a str representing the path to the
image filename, or a PIL.ImageFile.ImageFile object representing
the image loaded using the PIL library.
:returns PdfDict: Image XObject
"""
image = Image.resolve_image(image)
# PILImage.convert drops the format attribute
image_format = image.format
width, height = image.size
# Normalize images to RGB or grayscale color spaces, and split out the
# alpha layer into a PDF smask XObject
image, smask_xobj = Image.convert_to_compatible_image(
image,
image_format,
)
if image_format in ('PNG', 'GIF'):
content = Image.make_compressed_image_content(image)
filter_type = 'FlateDecode' # TODO use a predictor
elif image_format == 'JPEG':
content = Image.make_jpeg_image_content(image)
filter_type = 'DCTDecode'
else:
raise ValueError(
'Unsupported image format: {}. Supported formats are '
'PNG, JPEG, and GIF'.format(image.format))
xobj = PdfDict(
stream=content,
BitsPerComponent=8,
Filter=PdfName(filter_type),
ColorSpace=Image._get_color_space_name(image),
Width=width,
Height=height,
Subtype=PdfName('Image'),
Type=PdfName('XObject'),
)
if smask_xobj is not None:
xobj.SMask = smask_xobj
return xobj
def create_bookmarks(bookmarks, pages, parent=None):
count = len(bookmarks)
bookmark_objects = []
for label, target, children in bookmarks:
destination = (pages[target[0]].indirect, PdfName('XYZ'), target[1],
target[2], 0)
bookmark_object = PdfDict(Title=PdfString.encode(label),
A=PdfDict(Type=PdfName('Action'),
S=PdfName('GoTo'),
D=PdfArray(destination)))
bookmark_object.indirect = True
children_objects, children_count = create_bookmarks(
children, pages, parent=bookmark_object)
bookmark_object.Count = 1 + children_count
if bookmark_objects:
bookmark_object.Prev = bookmark_objects[-1]
bookmark_objects[-1].Next = bookmark_object
if children_objects:
bookmark_object.First = children_objects[0]
bookmark_object.Last = children_objects[-1]
if parent is not None:
bookmark_object.Parent = parent
count += children_count
bookmark_objects.append(bookmark_object)
return bookmark_objects, count
def test_indirect_set_get(self):
io = PdfIndirect((1,2,3))
io.value = 42
d = PdfDict()
d.Name = io
test, = (x for x in dict.values(d))
self.assertEqual(test, io)
v = d['/Name']
self.assertEqual(v, io.value)
test, = d
self.assertEqual(type(test), type(PdfName.Name))
def add_payload(name, output, path):
print('[*] Reading PDF file: %s' % name)
reader = PdfReader(name)
print('[*] Injecting the payload in the PDF file...')
reader.pages[0].AA = PdfDict(
O=PdfDict(F=r'%s' % path, D=[0, PdfName('Fit')], S=PdfName('GoToE')))
writer = PdfWriter()
writer.addpages(reader.pages)
print('[*] Saving modified PDF as: %s' % output)
writer.write(output)
print('[*] Done!')
def test_indirect_set_get(self):
io = PdfIndirect((1, 2, 3))
io.value = 42
d = PdfDict()
d.Name = io
test, = (x for x in dict.values(d))
self.assertEqual(test, io)
v = d['/Name']
self.assertEqual(v, io.value)
test, = d
self.assertEqual(type(test), type(PdfName.Name))
def fillPDF(pdf_file, fields, workId):
pdf = PdfReader(pdf_file)
anns = pdf.pages[0]['/Annots']
for ann in anns:
key = ann['/T'][1:-1]
if key in fields:
ann.update(PdfDict(V='{}'.format(fields[key])))
filename = 'registro{}_s{}-{}{}.pdf'.format(workId, fields['Semana'], fields['Mes'], fields['Anio'])
pdf.Root.AcroForm.update(PdfDict(NeedAppearances=PdfObject('true')))
PdfWriter().write(filename, pdf)
print(filename)
def get_png_smask(image):
width, height = image.size
smask = Image.make_compressed_image_content(image.getchannel('A'))
smask_xobj = PdfDict(
stream=smask,
Width=width,
Height=height,
BitsPerComponent=8,
Filter=PdfName('FlateDecode'),
ColorSpace=PdfName('DeviceGray'),
Subtype=PdfName('Image'),
Type=PdfName('XObject'),
)
smask_xobj.indirect = True
return smask_xobj
def _fill_pdf_metadata(out_file, issuer, issuer_address, columns, data):
# create metadata objest (json)
metadata_object = {}
metadata_fields = columns.split(",")
for md in metadata_fields:
if md in data:
metadata_object[md] = data[md]
# issuer and issuer_address used to go as separate metadata fields
# but now go to the metadata_object. They are still compulsory!
# The validator that reads metadata requires to look for issuer and
# issuer_address both in the metadata_object and if not fount it has
# to look for them as separate metadata fields for backwards
# compatibility (certificates issued with v0.9.3 and before)
metadata_object['issuer'] = issuer
metadata_object['issuer_address'] = issuer_address
# add the metadata
metadata = PdfDict(metadata_object=json.dumps(metadata_object),
chainpoint_proof='')
pdf = PdfReader(out_file)
pdf.Info.update(metadata)
PdfWriter().write(out_file, pdf)
# print progress
print('.', end="", flush=True)
def aggr_pdf(pdfname, pdfpaths, origin_directory):
params = setup()
(G, o, g1, g2, e) = params
# 从多个文件中读出所有签名
sigs = []
for path in pdfpaths:
pdf = PdfReader(path + os.path.sep + pdfname)
try:
sig_str:str = pdf.Info.signature
sig_str = sig_str[1:-1]
sig_bytes = base64.b64decode( sig_str.encode("utf-8") )
sig_g1elem = G1Elem.from_bytes(sig_bytes,G)
except:
sig_g1elem = None
sigs.append(sig_g1elem)
print('all_sigs:',sigs)
# 聚合所有签名
sigma = aggregate_sigma(params, sigs)
print('type sigma:',type(sigma))
sigma_bytes = sigma.export()
sigma_str = base64.b64encode(sigma_bytes).decode()
# 将聚合后的签名写回运行路径中新建的以blockstackid命名的pdf中
pdf = PdfReader(origin_directory + os.path.sep + pdfname)
metadata_new = PdfDict(signature = sigma_str)
pdf.Info.update(metadata_new)
PdfWriter().write(pdfname, pdf)
def get_form_fields_from_fdf(pdf_file_path):
try:
pdf_reader = PdfReader(pdf_file_path)
except errors.PdfParseError:
print(f'File \'{pdf_file_path}\' not found please specify full path')
return None
try:
# Check if PDF has Form Fields and if we can read them
pdf_form_fields = pdf_reader.Root.AcroForm.Fields
except AttributeError:
print(f'File \'{pdf_file_path}\' no Form Fields')
return None
# Create an empty PdfDict to collect Form Fields and Values
pdf_metadata = PdfDict()
# Define list of Form Fields to be ignored from transfer to PdfDict
# For example: field Sig
ignore_fields = ('/Sig',)
# Load Form Fields into PdfDict
for field in pdf_form_fields:
if field.FT not in ignore_fields:
field_name = field.T
if field_name is not None:
key_name = PdfName(field_name.decode())
pdf_metadata[key_name] = field.V
return pdf_metadata
def apply_updated_text(document, text_tokens, page_tokens):
# Create a new content stream for each page by concatenating the
# tokens in the page_tokens lists.
from pdfrw import PdfArray
for i, page in enumerate(document.pages):
if page.Contents is None: continue # nothing was here
# Replace the page's content stream with our updated tokens.
# The content stream may have been an array of streams before,
# so replace the whole thing with a single new stream. Unfortunately
# the str on PdfArray and PdfDict doesn't work right.
def tok_str(tok):
if isinstance(tok, PdfArray):
return "[ " + " ".join(tok_str(x) for x in tok) + "] "
if isinstance(tok, InlineImage):
return "BI " + " ".join(
tok_str(x) + " " + tok_str(y)
for x, y in tok.items()) + " ID " + tok.stream + " EI "
if isinstance(tok, PdfDict):
return "<< " + " ".join(
tok_str(x) + " " + tok_str(y)
for x, y in tok.items()) + ">> "
return str(tok)
page.Contents = PdfDict()
page.Contents.stream = "\n".join(
tok_str(tok) for tok in page_tokens[i])
page.Contents.Length = len(page.Contents.stream) # reset
def remove_chainpoint_proof_and_hash(pdf_file):
filename = os.path.basename(pdf_file)
tmp_filename = '__' + filename
shutil.copy(pdf_file, tmp_filename)
# get txid and target hash from proof
pdf = PdfReader(tmp_filename)
try:
proof = json.loads(pdf.Info.chainpoint_proof.decode())
except AttributeError:
# TODO: log error
return None, None
except json.decoder.JSONDecodeError:
# TODO: log error
return None, None
txid = proof['anchors'][0]['sourceId']
targetHash = proof['targetHash']
# remove the proof and get the hash
metadata = PdfDict(chainpoint_proof='')
pdf.Info.update(metadata)
PdfWriter().write(tmp_filename, pdf)
cert_hash = None
with open(tmp_filename, 'rb') as cert:
# note that the cert_hash is a hash object -- can use hexdigest() to debug
cert_hash = hashlib.sha256(cert.read())
os.remove(tmp_filename)
if targetHash == cert_hash.hexdigest():
return cert_hash.digest(), txid
else:
return None, None
def insert_proof_to_certificates(conf, cp, txid, cert_files):
print('')
for ind, val in enumerate(cert_files):
proof = json.dumps(cp.get_receipt(ind, txid))
metadata = PdfDict(chainpoint_proof=proof)
pdf = PdfReader(val)
pdf.Info.update(metadata)
PdfWriter().write(val, pdf)
def write_fillable_pdf(input_pdf_path, output_pdf_path, data_dict,
camposCheckBox):
template_pdf = PdfReader(input_pdf_path)
#Necesario para que se vean cambios
template_pdf.Root.AcroForm.update(
PdfDict(NeedAppearances=PdfObject('true')))
#Por cada pagina del PDF
for page in template_pdf.pages:
annotations = page[ANNOT_KEY]
#Para cada anotacion de la pagina
for annotation in annotations:
if annotation[SUBTYPE_KEY] == WIDGET_SUBTYPE_KEY:
if annotation[ANNOT_FIELD_KEY]:
key = annotation[ANNOT_FIELD_KEY][1:-1]
if key in data_dict.keys():
#HACK PARA LOS CHECK. Si es true, se marcan, sino no
if key in camposCheckBox:
if (data_dict[key] == 'true'):
annotation.update(
PdfDict(V='{}'.format(data_dict[key]),
AS=PdfName('Yes')))
#Si no se pone nada, por defecto no se marcan
continue
#Objeto necesario para que al rellenar se vean los campos
rct = annotation.Rect
hight = round(float(rct[3]) - float(rct[1]), 2)
width = (round(float(rct[2]) - float(rct[0]), 2))
xobj = PdfDict(
BBox=[0, 0, width, hight],
FormType=1,
Resources=PdfDict(
ProcSet=[PdfName.PDF, PdfName.Text]),
Subtype=PdfName.Form,
Type=PdfName.XObject)
#assign a stream to it
xobj.stream = '''/Tx BMC
BT
/Helvetica 8.0 Tf
1.0 5.0 Td
0 g
(''' + data_dict[key] + ''') Tj
ET EMC'''
#Actualizamos la anotacion en el PDF
annotation.update(
PdfDict(AP=PdfDict(N=xobj),
V='{}'.format(data_dict[key])))
#Escribimos el PDF ya anotado al PATH de salida
PdfWriter().write(output_pdf_path, template_pdf)
def getPages(allpages, x, y, gap):
# Number of pages to combine
count = x * y
# Pull pages off the list
pages = [pagexobj(p) for p in allpages[:count]]
del allpages[:count]
# Out page size
width_max = max(page.BBox[2] for page in pages)
height_max = max(page.BBox[3] for page in pages)
stream = []
xobjdict = PdfDict()
line = y
for index, page in enumerate(pages):
width = (index % x) * width_max / x
if not width:
line = line - 1
height = line * height_max / y
# Page number
index = '/P{}'.format(index)
format_stream = {
"x": 1. / x - gap,
"y": 1. / y - gap,
"w": width,
"h": height,
"i": index
}
stream.append(
'q {x} 0 0 {y} {w} {h} cm {i} Do Q\n'.format(**format_stream))
xobjdict[index] = page
return PdfDict(
Type=PdfName.Page,
Contents=PdfDict(stream=''.join(stream)),
MediaBox=PdfArray([-1000 * gap, -1000 * gap, width_max, height_max]),
Resources=PdfDict(XObject=xobjdict),
)
def _build_certificate_of_mailing_pdf(
user_information: Dict[str, str]) -> PdfReader:
form = from_dict(data_class=CertificateFormData, data=user_information)
pdf_path = path.join(
Path(__file__).parent, "files", f"certificate_of_mailing.pdf")
pdf = PdfReader(pdf_path)
for field in pdf.Root.AcroForm.Fields:
field_name = field.T.lower().replace(" ", "_").replace("(",
"").replace(
")", "")
field_value = getattr(form, field_name)
field.V = field_value
for page in pdf.pages:
annotations = page.get("/Annots")
if annotations:
for annotation in annotations:
annotation.update(PdfDict(AP=""))
pdf.Root.AcroForm.update(PdfDict(NeedAppearances=PdfObject("true")))
return pdf
def get_and_remove_chainpoint_proof(pdf_file):
pdf = PdfReader(pdf_file)
try:
proof = json.loads(pdf.Info.chainpoint_proof.decode())
except AttributeError:
return None
metadata = PdfDict(chainpoint_proof='')
pdf.Info.update(metadata)
PdfWriter().write(pdf_file, pdf)
return proof
def popup_make_ocgs(num):
from pdfrw import PdfDict, PdfArray, PdfName
n = 2
while choose(n, n / 2) < num:
n += 1
ocgs = []
for i in range(n):
ocg = PdfDict(Type=PdfName.OCG, Name="OCG {}".format(i), indirect=True)
ocgs.append(ocg)
if popup_pdf.Root.OCProperties:
print "Root.OCProperties already exists"
ocgs = PdfArray(ocgs)
#ocgs.indirect = True
popup_pdf.Root.OCProperties = PdfDict(OCGs=ocgs,
D=PdfDict(Order=ocgs,
ON=[],
OFF=ocgs))
code = [([], [])]
for ocg in ocgs:
code = [(c + [ocg], d) if take else (c, d + [ocg]) for c, d in code
for take in (True, False)]
code = [(c, d) for c, d in code if len(c) == n / 2]
# code is now an array of all different pairs (c,d)
# where c contains floor(n/2) OCGs and d the rest of the OCGs
hide_ocmd = PdfDict(indirect=True,
Type=PdfName.OCMD,
OCGs=ocgs,
P=PdfName.AllOff)
show_ocmd = PdfDict(indirect=True,
Type=PdfName.OCMD,
OCGs=ocgs,
P=PdfName.AnyOn)
return code, ocgs, hide_ocmd, show_ocmd
def populateSheet(character, context, options=default_options):
pdfPath = Path(context.function_directory)
pdf = PdfReader(pdfPath / options['template'])
pdf.Root.AcroForm.update(PdfDict(NeedAppearances=PdfObject('true')))
populateFields(character, pdf.Root.AcroForm.Fields)
output = BytesIO()
PdfWriter().write(output, pdf)
output.seek(0)
return output.read()
def _fill_pdf_metadata(out_file,
issuer,
issuer_address,
column_fields,
data,
global_columns,
verify_issuer,
interactive=False):
# create version
version = 1
# create issuer object (json)
issuer = {
"name": issuer,
"identity": {
"address": issuer_address,
"verification": json.loads(verify_issuer)['methods']
}
}
# create metadata object (json) and add metadata
metadata = {}
# add custom metadata
if column_fields:
metadata_fields = json.loads(column_fields)['columns']
for f in metadata_fields:
key = list(f)[0]
if key in data:
field_properties = f[key]
field_properties['value'] = data[key]
metadata[key] = field_properties
# add global field metadata
if global_columns:
global_fields = json.loads(global_columns)['fields']
for g in global_fields:
key = list(g)[0]
# note that global fields override column data
metadata[key] = g[key]
# add the metadata
pdf_metadata = PdfDict(version=version,
issuer=json.dumps(issuer),
metadata=json.dumps(metadata),
chainpoint_proof='')
pdf = PdfReader(out_file)
pdf.Info.update(pdf_metadata)
PdfWriter().write(out_file, pdf)
if interactive:
# print progress
print('.', end="", flush=True)
def insert_proof_to_certificates(conf, cp, txid, cert_files, interactive=False):
if interactive:
print('')
for ind, val in enumerate(cert_files):
proof = json.dumps( cp.get_receipt(ind, txid) )
metadata = PdfDict(chainpoint_proof=proof)
pdf = PdfReader(val)
pdf.Info.update(metadata)
PdfWriter().write(val, pdf)
if interactive:
# print progress
print('.', end="", flush=True)
def make_font_object():
"""Make a PDF Type1 font object for embedding in the annotation's
Resources dict. Only Helvetica is supported as a base font.
:returns PdfDict: Resources PdfDict object, ready to be included in the
Resources 'Font' subdictionary.
"""
return PdfDict(
Type=PdfName('Font'),
Subtype=PdfName('Type1'),
BaseFont=PdfName(DEFAULT_BASE_FONT),
Encoding=PdfName('WinAnsiEncoding'),
)
