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"""
Usage documentation at: <https://py-pdf.github.io/fpdf2/Annotations.html>
"""
import hashlib
from datetime import datetime
from typing import TYPE_CHECKING, Any, Optional, Sequence, Union
from .actions import Action
from .enums import (
AnnotationFlag,
AnnotationName,
AssociatedFileRelationship,
FileAttachmentAnnotationName,
)
from .syntax import (
Destination,
Name,
PDFContentStream,
PDFDate,
PDFObject,
PDFString,
build_obj_dict,
create_dictionary_string as pdf_dict,
create_list_string as pdf_list,
iobj_ref as pdf_ref,
)
if TYPE_CHECKING:
from .encryption import StandardSecurityHandler
# cf. https://docs.verapdf.org/validation/pdfa-part1/#rule-653-2
DEFAULT_ANNOT_FLAGS = (AnnotationFlag.PRINT,)
class AnnotationMixin:
def __init__(
self,
subtype: str,
x: float,
y: float,
width: float,
height: float,
flags: tuple[AnnotationFlag | str, ...] = DEFAULT_ANNOT_FLAGS,
contents: Optional[str] = None,
dest: Optional[Destination | PDFString] = None,
action: Optional[Action] = None,
color: Optional[tuple[float, float, float]] = None,
modification_time: Optional[datetime] = None,
title: Optional[str] = None,
quad_points: Optional[Sequence[float]] = None,
border_width: float = 0, # PDF readers support: displayed by Acrobat but not Sumatra
name: Union[AnnotationName, FileAttachmentAnnotationName, None] = None,
ink_list: Optional[tuple[float, ...]] = None, # for ink annotations
file_spec: Optional[Union["FileSpec", str]] = None,
field_type: Optional[str] = None,
value: Optional[str] = None,
default_appearance: Optional[str] = None, # for free text annotations
) -> None:
self.type = Name("Annot")
self.subtype = Name(subtype)
self.rect = f"[{x:.2f} {y - height:.2f} {x + width:.2f} {y:.2f}]"
self.border = f"[0 0 {border_width}]"
self.f_t = Name(field_type) if field_type else None
self.v = value
self.f = sum(tuple(AnnotationFlag.coerce(flag) for flag in flags))
self.contents = PDFString(contents, encrypt=True) if contents else None
self.a = action
self.dest = dest
self.c = f"[{color[0]} {color[1]} {color[2]}]" if color else None
self.t = PDFString(title, encrypt=True) if title else None
self.m = PDFDate(modification_time, encrypt=True) if modification_time else None
self.quad_points = (
pdf_list([f"{quad_point:.2f}" for quad_point in quad_points])
if quad_points
else None
)
self.p = None # must always be set before calling .serialize()
self.name = name
self.ink_list = (
("[" + pdf_list([f"{coord:.2f}" for coord in ink_list]) + "]")
if ink_list
else None
)
self.f_s = file_spec
self.d_a = default_appearance
class PDFAnnotation(AnnotationMixin, PDFObject):
"A PDF annotation that get serialized as an obj<</>>endobj block"
def __init__(self, *args: Any, **kwargs: Any) -> None:
super().__init__(*args, **kwargs)
class AnnotationDict(AnnotationMixin):
"A PDF annotation that get serialized as an inline <<dictionary>>"
__slots__ = ( # RAM usage optimization
"type",
"subtype",
"rect",
"border",
"f_t",
"v",
"f",
"contents",
"a",
"dest",
"c",
"t",
"quad_points",
"p",
"name",
"ink_list",
"f_s",
"d_a",
)
def serialize(
self,
_security_handler: Optional["StandardSecurityHandler"] = None,
_obj_id: Optional[int] = None,
) -> str:
obj_dict = build_obj_dict(
{key: getattr(self, key) for key in dir(self)},
_security_handler=_security_handler,
_obj_id=_obj_id,
)
return pdf_dict(obj_dict)
def __repr__(self) -> str:
keys = [key for key in dir(self) if not key.startswith("__")]
d = {key: getattr(self, key) for key in keys}
d = {key: value for key, value in d.items() if not callable(value)}
return f"AnnotationDict(**{d})"
class PDFEmbeddedFile(PDFContentStream):
def __init__(
self,
basename: str,
contents: bytes,
desc: str = "",
creation_date: Optional[datetime] = None,
modification_date: Optional[datetime] = None,
mime_type: Optional[str] = None,
af_relationship: Optional[AssociatedFileRelationship] = None,
compress: bool = False,
checksum: bool = False,
):
super().__init__(contents=contents, compress=compress)
self.type = Name("EmbeddedFile")
params: dict[str, object] = {"/Size": len(contents)}
if creation_date:
params["/CreationDate"] = PDFDate(creation_date, with_tz=True).serialize()
if modification_date:
params["/ModDate"] = PDFDate(modification_date, with_tz=True).serialize()
if checksum:
file_hash = hashlib.new("md5", usedforsecurity=False)
file_hash.update(self._contents)
hash_hex = file_hash.hexdigest()
params["/CheckSum"] = f"<{hash_hex}>"
if mime_type:
self.subtype = Name(mime_type)
self.params = pdf_dict(params)
self._basename: str = basename # private so that it does not get serialized
self._desc: str = desc # private so that it does not get serialized
self._globally_enclosed: bool = True
self._af_relationship: Optional[AssociatedFileRelationship] = af_relationship
self._file_spec: Optional[FileSpec] = None
def globally_enclosed(self) -> bool:
return self._globally_enclosed
def set_globally_enclosed(self, value: bool) -> None:
self._globally_enclosed = value
def basename(self) -> str:
return self._basename
def file_spec(self) -> "FileSpec":
if not self._file_spec:
self._file_spec = FileSpec(
self, self._basename, self._desc, self._af_relationship
)
return self._file_spec
class FileSpec(PDFObject):
def __init__(
self,
embedded_file: PDFEmbeddedFile,
basename: str,
desc: Optional[str] = None,
af_relationship: Optional[AssociatedFileRelationship] = None,
):
super().__init__()
self.type = Name("Filespec")
self.f = PDFString(basename)
self.u_f = PDFString(basename)
if desc:
self.desc = PDFString(desc)
if af_relationship:
self.a_f_relationship = Name(af_relationship.value)
self._embedded_file = embedded_file
@property
def e_f(self) -> str:
return pdf_dict({"/F": pdf_ref(self._embedded_file.id)})
|
