# Copyright (c) 2006, Mathieu Fenniak
# Copyright (c) 2007, Ashish Kulkarni <kulkarni.ashish@gmail.com>
# Copyright (c) 2024, Pubpub-ZZ
#
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
#
# * Redistributions of source code must retain the above copyright notice,
# this list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above copyright notice,
# this list of conditions and the following disclaimer in the documentation
# and/or other materials provided with the distribution.
# * The name of the author may not be used to endorse or promote products
# derived from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
import struct
import zlib
from abc import abstractmethod
from datetime import datetime
from typing import (
Any,
Dict,
Iterable,
Iterator,
List,
Mapping,
Optional,
Tuple,
Union,
cast,
)
from ._encryption import Encryption
from ._page import PageObject, _VirtualList
from ._page_labels import index2label as page_index2page_label
from ._utils import (
b_,
deprecate_with_replacement,
logger_warning,
parse_iso8824_date,
)
from .constants import CatalogAttributes as CA
from .constants import CatalogDictionary as CD
from .constants import (
CheckboxRadioButtonAttributes,
GoToActionArguments,
UserAccessPermissions,
)
from .constants import Core as CO
from .constants import DocumentInformationAttributes as DI
from .constants import FieldDictionaryAttributes as FA
from .constants import PageAttributes as PG
from .constants import PagesAttributes as PA
from .errors import (
PdfReadError,
)
from .generic import (
ArrayObject,
BooleanObject,
ByteStringObject,
Destination,
DictionaryObject,
EncodedStreamObject,
Field,
Fit,
FloatObject,
IndirectObject,
NameObject,
NullObject,
NumberObject,
PdfObject,
TextStringObject,
TreeObject,
ViewerPreferences,
create_string_object,
)
from .types import OutlineType, PagemodeType
from .xmp import XmpInformation
def convert_to_int(d: bytes, size: int) -> Union[int, Tuple[Any, ...]]:
if size > 8:
raise PdfReadError("invalid size in convert_to_int")
d = b"\x00\x00\x00\x00\x00\x00\x00\x00" + d
d = d[-8:]
return struct.unpack(">q", d)[0]
class PdfDocCommon:
"""
Common functions from PdfWriter and PdfReader objects.
This root class is strongly abstracted.
"""
strict: bool = False # default
_encryption: Optional[Encryption] = None
@property
@abstractmethod
def root_object(self) -> DictionaryObject:
... # pragma: no cover
@property
@abstractmethod
def pdf_header(self) -> str:
... # pragma: no cover
@abstractmethod
def get_object(
self, indirect_reference: Union[int, IndirectObject]
) -> Optional[PdfObject]:
... # pragma: no cover
@abstractmethod
def _replace_object(self, indirect: IndirectObject, obj: PdfObject) -> PdfObject:
... # pragma: no cover
@property
@abstractmethod
def _info(self) -> Optional[DictionaryObject]:
... # pragma: no cover
@property
def metadata(self) -> Optional[DocumentInformation]:
"""
Retrieve the PDF file's document information dictionary, if it exists.
Note that some PDF files use metadata streams instead of document
information dictionaries, and these metadata streams will not be
accessed by this function.
"""
retval = DocumentInformation()
if self._info is None:
return None
retval.update(self._info)
return retval
@property
def xmp_metadata(self) -> Optional[XmpInformation]:
... # pragma: no cover
@abstractmethod
def _repr_mimebundle_(
self,
include: Union[None, Iterable[str]] = None,
exclude: Union[None, Iterable[str]] = None,
) -> Dict[str, Any]:
"""
Integration into Jupyter Notebooks.
This method returns a dictionary that maps a mime-type to it's
representation.
See https://ipython.readthedocs.io/en/stable/config/integrating.html
"""
... # pragma: no cover
@property
def viewer_preferences(self) -> Optional[ViewerPreferences]:
"""Returns the existing ViewerPreferences as an overloaded dictionary."""
o = self.root_object.get(CD.VIEWER_PREFERENCES, None)
if o is None:
return None
o = o.get_object()
if not isinstance(o, ViewerPreferences):
o = ViewerPreferences(o)
if hasattr(o, "indirect_reference"):
self._replace_object(o.indirect_reference, o)
else:
self.root_object[NameObject(CD.VIEWER_PREFERENCES)] = o
return o
flattened_pages: Optional[List[PageObject]] = None
def get_num_pages(self) -> int:
"""
Calculate the number of pages in this PDF file.
Returns:
The number of pages of the parsed PDF file
Raises:
PdfReadError: if file is encrypted and restrictions prevent
this action.
"""
# Flattened pages will not work on an encrypted PDF;
# the PDF file's page count is used in this case. Otherwise,
# the original method (flattened page count) is used.
if self.is_encrypted:
return self.root_object["/Pages"]["/Count"] # type: ignore
else:
if self.flattened_pages is None:
self._flatten()
assert self.flattened_pages is not None
return len(self.flattened_pages)
def get_page(self, page_number: int) -> PageObject:
"""
Retrieve a page by number from this PDF file.
Most of the time ```.pages[page_number]``` is preferred.
Args:
page_number: The page number to retrieve
(pages begin at zero)
Returns:
A :class:`PageObject<pypdf._page.PageObject>` instance.
"""
if self.flattened_pages is None:
self._flatten()
assert self.flattened_pages is not None, "hint for mypy"
return self.flattened_pages[page_number]
@property
def named_destinations(self) -> Dict[str, Any]:
"""
A read-only dictionary which maps names to
:class:`Destinations<pypdf.generic.Destination>`
"""
return self._get_named_destinations()
def get_named_dest_root(self) -> ArrayObject:
named_dest = ArrayObject()
if CA.NAMES in self.root_object and isinstance(
self.root_object[CA.NAMES], DictionaryObject
):
names = cast(DictionaryObject, self.root_object[CA.NAMES])
names_ref = names.indirect_reference
if CA.DESTS in names and isinstance(names[CA.DESTS], DictionaryObject):
# 3.6.3 Name Dictionary (PDF spec 1.7)
dests = cast(DictionaryObject, names[CA.DESTS])
dests_ref = dests.indirect_reference
if CA.NAMES in dests:
# TABLE 3.33 Entries in a name tree node dictionary
named_dest = cast(ArrayObject, dests[CA.NAMES])
else:
named_dest = ArrayObject()
dests[NameObject(CA.NAMES)] = named_dest
elif hasattr(self, "_add_object"):
dests = DictionaryObject()
dests_ref = self._add_object(dests)
names[NameObject(CA.DESTS)] = dests_ref
dests[NameObject(CA.NAMES)] = named_dest
elif hasattr(self, "_add_object"):
names = DictionaryObject()
names_ref = self._add_object(names)
self.root_object[NameObject(CA.NAMES)] = names_ref
dests = DictionaryObject()
dests_ref = self._add_object(dests)
names[NameObject(CA.DESTS)] = dests_ref
dests[NameObject(CA.NAMES)] = named_dest
return named_dest
## common
def _get_named_destinations(
self,
tree: Union[TreeObject, None] = None,
retval: Optional[Any] = None,
) -> Dict[str, Any]:
"""
Retrieve the named destinations present in the document.
Args:
tree:
retval:
Returns:
A dictionary which maps names to
:class:`Destinations<pypdf.generic.Destination>`.
"""
if retval is None:
retval = {}
catalog = self.root_object
# get the name tree
if CA.DESTS in catalog:
tree = cast(TreeObject, catalog[CA.DESTS])
elif CA.NAMES in catalog:
names = cast(DictionaryObject, catalog[CA.NAMES])
if CA.DESTS in names:
tree = cast(TreeObject, names[CA.DESTS])
if tree is None:
return retval
if PA.KIDS in tree:
# recurse down the tree
for kid in cast(ArrayObject, tree[PA.KIDS]):
self._get_named_destinations(kid.get_object(), retval)
# TABLE 3.33 Entries in a name tree node dictionary (PDF 1.7 specs)
elif CA.NAMES in tree: # KIDS and NAMES are exclusives (PDF 1.7 specs p 162)
names = cast(DictionaryObject, tree[CA.NAMES])
i = 0
while i < len(names):
key = cast(str, names[i].get_object())
i += 1
if not isinstance(key, str):
continue
try:
value = names[i].get_object()
except IndexError:
break
i += 1
if isinstance(value, DictionaryObject):
if "/D" in value:
value = value["/D"]
else:
continue
dest = self._build_destination(key, value) # type: ignore
if dest is not None:
retval[key] = dest
else: # case where Dests is in root catalog (PDF 1.7 specs, §2 about PDF 1.1)
for k__, v__ in tree.items():
val = v__.get_object()
if isinstance(val, DictionaryObject):
if "/D" in val:
val = val["/D"].get_object()
else:
continue
dest = self._build_destination(k__, val)
if dest is not None:
retval[k__] = dest
return retval
# A select group of relevant field attributes. For the complete list.
# See §12.3.2 of the PDF 1.7 or PDF 2.0 specification.
def get_fields(
self,
tree: Optional[TreeObject] = None,
retval: Optional[Dict[Any, Any]] = None,
fileobj: Optional[Any] = None,
) -> Optional[Dict[str, Any]]:
"""
Extract field data if this PDF contains interactive form fields.
The *tree* and *retval* parameters are for recursive use.
Args:
tree:
retval:
fileobj: A file object (usually a text file) to write
a report to on all interactive form fields found.
Returns:
A dictionary where each key is a field name, and each
value is a :class:`Field<pypdf.generic.Field>` object. By
default, the mapping name is used for keys.
``None`` if form data could not be located.
"""
field_attributes = FA.attributes_dict()
field_attributes.update(CheckboxRadioButtonAttributes.attributes_dict())
if retval is None:
retval = {}
catalog = self.root_object
# get the AcroForm tree
if CD.ACRO_FORM in catalog:
tree = cast(Optional[TreeObject], catalog[CD.ACRO_FORM])
else:
return None
if tree is None:
return retval
self._check_kids(tree, retval, fileobj)
for attr in field_attributes:
if attr in tree:
# Tree is a field
self._build_field(tree, retval, fileobj, field_attributes)
break
if "/Fields" in tree:
fields = cast(ArrayObject, tree["/Fields"])
for f in fields:
field = f.get_object()
self._build_field(field, retval, fileobj, field_attributes)
return retval
def _get_qualified_field_name(self, parent: DictionaryObject) -> str:
if "/TM" in parent:
return cast(str, parent["/TM"])
elif "/Parent" in parent:
return (
self._get_qualified_field_name(
cast(DictionaryObject, parent["/Parent"])
)
+ "."
+ cast(str, parent.get("/T", ""))
)
else:
return cast(str, parent.get("/T", ""))
def _build_field(
self,
field: Union[TreeObject, DictionaryObject],
retval: Dict[Any, Any],
fileobj: Any,
field_attributes: Any,
) -> None:
self._check_kids(field, retval, fileobj)
try:
key = cast(str, field["/TM"])
except KeyError:
try:
if "/Parent" in field:
key = (
self._get_qualified_field_name(
cast(DictionaryObject, field["/Parent"])
)
+ "."
)
else:
key = ""
key += cast(str, field["/T"])
except KeyError:
# Ignore no-name field for now
return
if fileobj:
self._write_field(fileobj, field, field_attributes)
fileobj.write("\n")
retval[key] = Field(field)
obj = retval[key].indirect_reference.get_object() # to get the full object
if obj.get(FA.FT, "") == "/Ch":
retval[key][NameObject("/_States_")] = obj[NameObject(FA.Opt)]
if obj.get(FA.FT, "") == "/Btn" and "/AP" in obj:
# Checkbox
retval[key][NameObject("/_States_")] = ArrayObject(
list(obj["/AP"]["/N"].keys())
)
if "/Off" not in retval[key]["/_States_"]:
retval[key][NameObject("/_States_")].append(NameObject("/Off"))
elif obj.get(FA.FT, "") == "/Btn" and obj.get(FA.Ff, 0) & FA.FfBits.Radio != 0:
states: List[str] = []
retval[key][NameObject("/_States_")] = ArrayObject(states)
for k in obj.get(FA.Kids, {}):
k = k.get_object()
for s in list(k["/AP"]["/N"].keys()):
if s not in states:
states.append(s)
retval[key][NameObject("/_States_")] = ArrayObject(states)
if (
obj.get(FA.Ff, 0) & FA.FfBits.NoToggleToOff != 0
and "/Off" in retval[key]["/_States_"]
):
del retval[key]["/_States_"][retval[key]["/_States_"].index("/Off")]
def _check_kids(
self, tree: Union[TreeObject, DictionaryObject], retval: Any, fileobj: Any
) -> None:
if PA.KIDS in tree:
# recurse down the tree
for kid in tree[PA.KIDS]: # type: ignore
self.get_fields(kid.get_object(), retval, fileobj)
def _write_field(self, fileobj: Any, field: Any, field_attributes: Any) -> None:
field_attributes_tuple = FA.attributes()
field_attributes_tuple = (
field_attributes_tuple + CheckboxRadioButtonAttributes.attributes()
)
for attr in field_attributes_tuple:
if attr in (
FA.Kids,
FA.AA,
):
continue
attr_name = field_attributes[attr]
try:
if attr == FA.FT:
# Make the field type value more clear
types = {
"/Btn": "Button",
"/Tx": "Text",
"/Ch": "Choice",
"/Sig": "Signature",
}
if field[attr] in types:
fileobj.write(f"{attr_name}: {types[field[attr]]}\n")
elif attr == FA.Parent:
# Let's just write the name of the parent
try:
name = field[attr][FA.TM]
except KeyError:
name = field[attr][FA.T]
fileobj.write(f"{attr_name}: {name}\n")
else:
fileobj.write(f"{attr_name}: {field[attr]}\n")
except KeyError:
# Field attribute is N/A or unknown, so don't write anything
pass
def get_form_text_fields(self, full_qualified_name: bool = False) -> Dict[str, Any]:
"""
Retrieve form fields from the document with textual data.
Args:
full_qualified_name: to get full name
Returns:
A dictionary. The key is the name of the form field,
the value is the content of the field.
If the document contains multiple form fields with the same name, the
second and following will get the suffix .2, .3, ...
"""
def indexed_key(k: str, fields: Dict[Any, Any]) -> str:
if k not in fields:
return k
else:
return (
k
+ "."
+ str(sum([1 for kk in fields if kk.startswith(k + ".")]) + 2)
)
# Retrieve document form fields
formfields = self.get_fields()
if formfields is None:
return {}
ff = {}
for field, value in formfields.items():
if value.get("/FT") == "/Tx":
if full_qualified_name:
ff[field] = value.get("/V")
else:
ff[indexed_key(cast(str, value["/T"]), ff)] = value.get("/V")
return ff
def get_pages_showing_field(
self, field: Union[Field, PdfObject, IndirectObject]
) -> List[PageObject]:
"""
Provides list of pages where the field is called.
Args:
field: Field Object, PdfObject or IndirectObject referencing a Field
Returns:
List of pages:
- Empty list:
The field has no widgets attached
(either hidden field or ancestor field).
- Single page list:
Page where the widget is present
(most common).
- Multi-page list:
Field with multiple kids widgets
(example: radio buttons, field repeated on multiple pages).
"""
def _get_inherited(obj: DictionaryObject, key: str) -> Any:
if key in obj:
return obj[key]
elif "/Parent" in obj:
return _get_inherited(
cast(DictionaryObject, obj["/Parent"].get_object()), key
)
else:
return None
try:
# to cope with all types
field = cast(DictionaryObject, field.indirect_reference.get_object()) # type: ignore
except Exception as exc:
raise ValueError("field type is invalid") from exc
if _get_inherited(field, "/FT") is None:
raise ValueError("field is not valid")
ret = []
if field.get("/Subtype", "") == "/Widget":
if "/P" in field:
ret = [field["/P"].get_object()]
else:
ret = [
p
for p in self.pages
if field.indirect_reference in p.get("/Annots", "")
]
else:
kids = field.get("/Kids", ())
for k in kids:
k = k.get_object()
if (k.get("/Subtype", "") == "/Widget") and ("/T" not in k):
# Kid that is just a widget, not a field:
if "/P" in k:
ret += [k["/P"].get_object()]
else:
ret += [
p
for p in self.pages
if k.indirect_reference in p.get("/Annots", "")
]
return [
x
if isinstance(x, PageObject)
else (self.pages[self._get_page_number_by_indirect(x.indirect_reference)]) # type: ignore
for x in ret
]
@property
def open_destination(
self,
) -> Union[None, Destination, TextStringObject, ByteStringObject]:
"""
Property to access the opening destination (``/OpenAction`` entry in
the PDF catalog). It returns ``None`` if the entry does not exist is not
set.
Raises:
Exception: If a destination is invalid.
"""
if "/OpenAction" not in self.root_object:
return None
oa: Any = self.root_object["/OpenAction"]
if isinstance(oa, bytes): # pragma: no cover
oa = oa.decode()
if isinstance(oa, str):
return create_string_object(oa)
elif isinstance(oa, ArrayObject):
try:
page, typ = oa[0:2]
array = oa[2:]
fit = Fit(typ, tuple(array))
return Destination("OpenAction", page, fit)
except Exception as exc:
raise Exception(f"Invalid Destination {oa}: {exc}")
else:
return None
@open_destination.setter
def open_destination(self, dest: Union[None, str, Destination, PageObject]) -> None:
raise NotImplementedError("no setter for open_destination")
@property
def outline(self) -> OutlineType:
"""
Read-only property for the outline present in the document.
(i.e., a collection of 'outline items' which are also known as
'bookmarks')
"""
return self._get_outline()
def _get_outline(
self, node: Optional[DictionaryObject] = None, outline: Optional[Any] = None
) -> OutlineType:
if outline is None:
outline = []
catalog = self.root_object
# get the outline dictionary and named destinations
if CO.OUTLINES in catalog:
lines = cast(DictionaryObject, catalog[CO.OUTLINES])
if isinstance(lines, NullObject):
return outline
# TABLE 8.3 Entries in the outline dictionary
if lines is not None and "/First" in lines:
node = cast(DictionaryObject, lines["/First"])
self._namedDests = self._get_named_destinations()
if node is None:
return outline
# see if there are any more outline items
while True:
outline_obj = self._build_outline_item(node)
if outline_obj:
outline.append(outline_obj)
# check for sub-outline
if "/First" in node:
sub_outline: List[Any] = []
self._get_outline(cast(DictionaryObject, node["/First"]), sub_outline)
if sub_outline:
outline.append(sub_outline)
if "/Next" not in node:
break
node = cast(DictionaryObject, node["/Next"])
return outline
@property
def threads(self) -> Optional[ArrayObject]:
"""
Read-only property for the list of threads.
See §8.3.2 from PDF 1.7 spec.
It's an array of dictionaries with "/F" and "/I" properties or
None if there are no articles.
"""
catalog = self.root_object
if CO.THREADS in catalog:
return cast("ArrayObject", catalog[CO.THREADS])
else:
return None
@abstractmethod
def _get_page_number_by_indirect(
self, indirect_reference: Union[None, int, NullObject, IndirectObject]
) -> Optional[int]:
... # pragma: no cover
def get_page_number(self, page: PageObject) -> Optional[int]:
"""
Retrieve page number of a given PageObject.
Args:
page: The page to get page number. Should be
an instance of :class:`PageObject<pypdf._page.PageObject>`
Returns:
The page number or None if page is not found
"""
return self._get_page_number_by_indirect(page.indirect_reference)
def get_destination_page_number(self, destination: Destination) -> Optional[int]:
"""
Retrieve page number of a given Destination object.
Args:
destination: The destination to get page number.
Returns:
The page number or None if page is not found
"""
return self._get_page_number_by_indirect(destination.page)
def _build_destination(
self,
title: str,
array: Optional[
List[
Union[NumberObject, IndirectObject, None, NullObject, DictionaryObject]
]
],
) -> Destination:
page, typ = None, None
# handle outline items with missing or invalid destination
if (
isinstance(array, (NullObject, str))
or (isinstance(array, ArrayObject) and len(array) == 0)
or array is None
):
page = NullObject()
return Destination(title, page, Fit.fit())
else:
page, typ = array[0:2] # type: ignore
array = array[2:]
try:
return Destination(title, page, Fit(fit_type=typ, fit_args=array)) # type: ignore
except PdfReadError:
logger_warning(f"Unknown destination: {title} {array}", __name__)
if self.strict:
raise
# create a link to first Page
tmp = self.pages[0].indirect_reference
indirect_reference = NullObject() if tmp is None else tmp
return Destination(title, indirect_reference, Fit.fit()) # type: ignore
def _build_outline_item(self, node: DictionaryObject) -> Optional[Destination]:
dest, title, outline_item = None, None, None
# title required for valid outline
# PDF Reference 1.7: TABLE 8.4 Entries in an outline item dictionary
try:
title = cast("str", node["/Title"])
except KeyError:
if self.strict:
raise PdfReadError(f"Outline Entry Missing /Title attribute: {node!r}")
title = ""
if "/A" in node:
# Action, PDFv1.7 Section 12.6 (only type GoTo supported)
action = cast(DictionaryObject, node["/A"])
action_type = cast(NameObject, action[GoToActionArguments.S])
if action_type == "/GoTo":
dest = action[GoToActionArguments.D]
elif "/Dest" in node:
# Destination, PDFv1.7 Section 12.3.2
dest = node["/Dest"]
# if array was referenced in another object, will be a dict w/ key "/D"
if isinstance(dest, DictionaryObject) and "/D" in dest:
dest = dest["/D"]
if isinstance(dest, ArrayObject):
outline_item = self._build_destination(title, dest)
elif isinstance(dest, str):
# named destination, addresses NameObject Issue #193
# TODO : keep named destination instead of replacing it ?
try:
outline_item = self._build_destination(
title, self._namedDests[dest].dest_array
)
except KeyError:
# named destination not found in Name Dict
outline_item = self._build_destination(title, None)
elif dest is None:
# outline item not required to have destination or action
# PDFv1.7 Table 153
outline_item = self._build_destination(title, dest)
else:
if self.strict:
raise PdfReadError(f"Unexpected destination {dest!r}")
else:
logger_warning(
f"Removed unexpected destination {dest!r} from destination",
__name__,
)
outline_item = self._build_destination(title, None)
# if outline item created, add color, format, and child count if present
if outline_item:
if "/C" in node:
# Color of outline item font in (R, G, B) with values ranging 0.0-1.0
outline_item[NameObject("/C")] = ArrayObject(FloatObject(c) for c in node["/C"]) # type: ignore
if "/F" in node:
# specifies style characteristics bold and/or italic
# with 1=italic, 2=bold, 3=both
outline_item[NameObject("/F")] = node["/F"]
if "/Count" in node:
# absolute value = num. visible children
# with positive = open/unfolded, negative = closed/folded
outline_item[NameObject("/Count")] = node["/Count"]
# if count is 0 we will consider it as open ( in order to have always an is_open to simplify
outline_item[NameObject("/%is_open%")] = BooleanObject(
node.get("/Count", 0) >= 0
)
outline_item.node = node
try:
outline_item.indirect_reference = node.indirect_reference
except AttributeError:
pass
return outline_item
@property
def pages(self) -> List[PageObject]:
"""
Property that emulates a list of :class:`PageObject<pypdf._page.PageObject>`.
this property allows to get a page or a range of pages.
For PdfWriter Only:
It provides also capability to remove a page/range of page from the list
(through del operator)
Note: only the page entry is removed. As the objects beneath can be used
somewhere else.
A solution to completely remove them - if they are not used anywhere -
is to write to a buffer/temporary file and to load it into a new PdfWriter
object afterwards.
"""
return _VirtualList(self.get_num_pages, self.get_page) # type: ignore
@property
def page_labels(self) -> List[str]:
"""
A list of labels for the pages in this document.
This property is read-only. The labels are in the order that the pages
appear in the document.
"""
return [page_index2page_label(self, i) for i in range(len(self.pages))]
@property
def page_layout(self) -> Optional[str]:
"""
Get the page layout currently being used.
.. list-table:: Valid ``layout`` values
:widths: 50 200
* - /NoLayout
- Layout explicitly not specified
* - /SinglePage
- Show one page at a time
* - /OneColumn
- Show one column at a time
* - /TwoColumnLeft
- Show pages in two columns, odd-numbered pages on the left
* - /TwoColumnRight
- Show pages in two columns, odd-numbered pages on the right
* - /TwoPageLeft
- Show two pages at a time, odd-numbered pages on the left
* - /TwoPageRight
- Show two pages at a time, odd-numbered pages on the right
"""
try:
return cast(NameObject, self.root_object[CD.PAGE_LAYOUT])
except KeyError:
return None
@property
def page_mode(self) -> Optional[PagemodeType]:
"""
Get the page mode currently being used.
.. list-table:: Valid ``mode`` values
:widths: 50 200
* - /UseNone
- Do not show outline or thumbnails panels
* - /UseOutlines
- Show outline (aka bookmarks) panel
* - /UseThumbs
- Show page thumbnails panel
* - /FullScreen
- Fullscreen view
* - /UseOC
- Show Optional Content Group (OCG) panel
* - /UseAttachments
- Show attachments panel
"""
try:
return self.root_object["/PageMode"] # type: ignore
except KeyError:
return None
def _flatten(
self,
pages: Union[None, DictionaryObject, PageObject] = None,
inherit: Optional[Dict[str, Any]] = None,
indirect_reference: Optional[IndirectObject] = None,
) -> None:
inheritable_page_attributes = (
NameObject(PG.RESOURCES),
NameObject(PG.MEDIABOX),
NameObject(PG.CROPBOX),
NameObject(PG.ROTATE),
)
if inherit is None:
inherit = {}
if pages is None:
# Fix issue 327: set flattened_pages attribute only for
# decrypted file
catalog = self.root_object
pages = catalog["/Pages"].get_object() # type: ignore
assert isinstance(pages, DictionaryObject)
self.flattened_pages = []
if PA.TYPE in pages:
t = cast(str, pages[PA.TYPE])
# if pdf has no type, considered as a page if /Kids is missing
elif PA.KIDS not in pages:
t = "/Page"
else:
t = "/Pages"
if t == "/Pages":
for attr in inheritable_page_attributes:
if attr in pages:
inherit[attr] = pages[attr]
for page in cast(ArrayObject, pages[PA.KIDS]):
addt = {}
if isinstance(page, IndirectObject):
addt["indirect_reference"] = page
obj = page.get_object()
if obj:
# damaged file may have invalid child in /Pages
self._flatten(obj, inherit, **addt)
elif t == "/Page":
for attr_in, value in list(inherit.items()):
# if the page has it's own value, it does not inherit the
# parent's value:
if attr_in not in pages:
pages[attr_in] = value
page_obj = PageObject(self, indirect_reference)
page_obj.update(pages)
# TODO: Could flattened_pages be None at this point?
self.flattened_pages.append(page_obj) # type: ignore
def remove_page(
self,
page: Union[int, PageObject, IndirectObject],
clean: bool = False,
) -> None:
"""
Remove page from pages list.
Args:
page: int / PageObject / IndirectObject
PageObject : page to be removed. If the page appears many times
only the first one will be removed
IndirectObject: Reference to page to be removed
int: Page number to be removed
clean: replace PageObject with NullObject to prevent destination,
annotation to reference a detached page
"""
if self.flattened_pages is None:
self._flatten()
assert self.flattened_pages is not None
if isinstance(page, IndirectObject):
p = page.get_object()
if not isinstance(p, PageObject):
logger_warning("IndirectObject is not referencing a page", __name__)
return
page = p
if not isinstance(page, int):
try:
page = self.flattened_pages.index(page)
except ValueError:
logger_warning("Cannot find page in pages", __name__)
return
if not (0 <= page < len(self.flattened_pages)):
logger_warning("Page number is out of range", __name__)
return
ind = self.pages[page].indirect_reference
del self.pages[page]
if clean and ind is not None:
self._replace_object(ind, NullObject())
def _get_indirect_object(self, num: int, gen: int) -> Optional[PdfObject]:
"""
Used to ease development.
This is equivalent to generic.IndirectObject(num,gen,self).get_object()
Args:
num: The object number of the indirect object.
gen: The generation number of the indirect object.
Returns:
A PdfObject
"""
return IndirectObject(num, gen, self).get_object()
def decode_permissions(
self, permissions_code: int
) -> Dict[str, bool]: # pragma: no cover
"""Take the permissions as an integer, return the allowed access."""
deprecate_with_replacement(
old_name="decode_permissions",
new_name="user_access_permissions",
removed_in="5.0.0",
)
permissions_mapping = {
"print": UserAccessPermissions.PRINT,
"modify": UserAccessPermissions.MODIFY,
"copy": UserAccessPermissions.EXTRACT,
"annotations": UserAccessPermissions.ADD_OR_MODIFY,
"forms": UserAccessPermissions.FILL_FORM_FIELDS,
# Do not fix typo, as part of official, but deprecated API.
"accessability": UserAccessPermissions.EXTRACT_TEXT_AND_GRAPHICS,
"assemble": UserAccessPermissions.ASSEMBLE_DOC,
"print_high_quality": UserAccessPermissions.PRINT_TO_REPRESENTATION,
}
return {
key: permissions_code & flag != 0
for key, flag in permissions_mapping.items()
}
@property
def user_access_permissions(self) -> Optional[UserAccessPermissions]:
"""Get the user access permissions for encrypted documents. Returns None if not encrypted."""
if self._encryption is None:
return None
return UserAccessPermissions(self._encryption.P)
@property
@abstractmethod
def is_encrypted(self) -> bool:
"""
Read-only boolean property showing whether this PDF file is encrypted.
Note that this property, if true, will remain true even after the
:meth:`decrypt()<pypdf.PdfReader.decrypt>` method is called.
"""
... # pragma: no cover
@property
def xfa(self) -> Optional[Dict[str, Any]]:
tree: Optional[TreeObject] = None
retval: Dict[str, Any] = {}
catalog = self.root_object
if "/AcroForm" not in catalog or not catalog["/AcroForm"]:
return None
tree = cast(TreeObject, catalog["/AcroForm"])
if "/XFA" in tree:
fields = cast(ArrayObject, tree["/XFA"])
i = iter(fields)
for f in i:
tag = f
f = next(i)
if isinstance(f, IndirectObject):
field = cast(Optional[EncodedStreamObject], f.get_object())
if field:
es = zlib.decompress(b_(field._data))
retval[tag] = es
return retval
@property
def attachments(self) -> Mapping[str, List[bytes]]:
return LazyDict(
{
name: (self._get_attachment_list, name)
for name in self._list_attachments()
}
)
def _list_attachments(self) -> List[str]:
"""
Retrieves the list of filenames of file attachments.
Returns:
list of filenames
"""
catalog = self.root_object
# From the catalog get the embedded file names
try:
filenames = cast(
ArrayObject,
cast(
DictionaryObject,
cast(DictionaryObject, catalog["/Names"])["/EmbeddedFiles"],
)["/Names"],
)
except KeyError:
return []
attachments_names = [f for f in filenames if isinstance(f, str)]
return attachments_names
def _get_attachment_list(self, name: str) -> List[bytes]:
out = self._get_attachments(name)[name]
if isinstance(out, list):
return out
return [out]
def _get_attachments(
self, filename: Optional[str] = None
) -> Dict[str, Union[bytes, List[bytes]]]:
"""
Retrieves all or selected file attachments of the PDF as a dictionary of file names
and the file data as a bytestring.
Args:
filename: If filename is None, then a dictionary of all attachments
will be returned, where the key is the filename and the value
is the content. Otherwise, a dictionary with just a single key
- the filename - and its content will be returned.
Returns:
dictionary of filename -> Union[bytestring or List[ByteString]]
If the filename exists multiple times a list of the different versions will be provided.
"""
catalog = self.root_object
# From the catalog get the embedded file names
try:
filenames = cast(
ArrayObject,
cast(
DictionaryObject,
cast(DictionaryObject, catalog["/Names"])["/EmbeddedFiles"],
)["/Names"],
)
except KeyError:
return {}
attachments: Dict[str, Union[bytes, List[bytes]]] = {}
# Loop through attachments
for i in range(len(filenames)):
f = filenames[i]
if isinstance(f, str):
if filename is not None and f != filename:
continue
name = f
f_dict = filenames[i + 1].get_object()
f_data = f_dict["/EF"]["/F"].get_data()
if name in attachments:
if not isinstance(attachments[name], list):
attachments[name] = [attachments[name]] # type:ignore
attachments[name].append(f_data) # type:ignore
else:
attachments[name] = f_data
return attachments
class LazyDict(Mapping[Any, Any]):
def __init__(self, *args: Any, **kw: Any) -> None:
self._raw_dict = dict(*args, **kw)
def __getitem__(self, key: str) -> Any:
func, arg = self._raw_dict.__getitem__(key)
return func(arg)
def __iter__(self) -> Iterator[Any]:
return iter(self._raw_dict)
def __len__(self) -> int:
return len(self._raw_dict)
def __str__(self) -> str:
return f"LazyDict(keys={list(self.keys())})"