# -*- coding: utf-8 -*- """ Use jinja2 templates to fill and sign PDF forms. """ import argparse import datetime import logging import sys import os import time from fdfgen import forge_fdf from jinja2 import Environment, TemplateSyntaxError from pdfminer.pdfparser import PDFParser from pdfminer.pdfdocument import PDFDocument from pdfminer.pdfpage import PDFPage from pdfminer.pdfinterp import PDFResourceManager, PDFPageInterpreter from pdfminer.pdfdevice import PDFDevice from pdfminer.pdftypes import PDFObjRef from pdfminer.layout import LAParams from pdfminer.converter import PDFPageAggregator from PIL import Image, ImageDraw, ImageFont from PyPDF2 import PdfFileWriter, PdfFileReader from reportlab.lib.utils import ImageReader from reportlab.pdfgen import canvas from subprocess import Popen, PIPE try: from cStringIO import StringIO as BytesIO except ImportError: try: from StringIO import StringIO as BytesIO except ImportError: from io import BytesIO PY3 = False if sys.version_info[0] == 3: PY3 = True try: from logging import NullHandler except ImportError: class NullHandler(logging.Handler): def emit(self, record): pass logger = logging.getLogger(__name__) logger.addHandler(NullHandler()) class Attachment(object): label_x = 8 label_y = 8 font = None fontsize = 12 def __init__(self, data, dimensions=None, text=None, font=None): img = Image.open(data) self.img = img self.dimensions = dimensions or (0, 0, img.size[0], img.size[1]) if img.mode == "RGBA": self.img = Image.new("RGB", img.size, (255, 255, 255)) mask = img.split()[-1] # 3 is the alpha channel self.img.paste(img, mask=mask) if font is not None: self.font = font if text is not None: font = ImageFont.truetype(self.font, self.fontsize) lines = text.split(os.linesep) dims = [font.getsize(l) for l in lines] w = sum(w for w, h in dims) h = sum(h for w, h in dims) self.label = Image.new("RGB", (w, h), (255, 255, 255)) draw = ImageDraw.Draw(self.label) y = 0 for (lw, lh), line in zip(dims, lines): draw.text((0, y), line, (0, 0, 0), font=font) y += lh def pdf(self): stream = BytesIO() pdf = canvas.Canvas(stream) w, h = self.img.size pdf.drawImage(ImageReader(self.img), *self.dimensions) if hasattr(self, "label"): w, h = self.label.size x, y = self.label_x, self.label_y pdf.drawImage(ImageReader(self.label), x, y, w, h) pdf.save() return PdfFileReader(stream).getPage(0) class PdfJinja(object): Attachment = Attachment def __init__(self, filename, jinja_env=None): self.jinja_env = Environment() self.context = None self.fields = {} self.watermarks = [] self.filename = filename self.register_filters() with open(filename, "rb") as fp: self.parse_pdf(fp) def register_filters(self): self.jinja_env.filters.update(dict( date=self.format_date, paste=self.paste, check=lambda v: "Yes" if v else "Off", X=lambda v: "X" if v else " ", Y=lambda v: "Y" if v else "N", )) def paste(self, data): rect = self.context["rect"] x, y = rect[0], rect[1] w, h = rect[2] - x, rect[3] - y pdf = self.Attachment(data, dimensions=(x, y, w, h)).pdf() self.watermarks.append((self.context["page"], pdf)) return " " def parse_pdf(self, fp): parser = PDFParser(fp) doc = PDFDocument(parser) rsrcmgr = PDFResourceManager() laparams = LAParams() device = PDFPageAggregator(rsrcmgr, laparams=laparams) interpreter = PDFPageInterpreter(rsrcmgr, device) device = PDFDevice(rsrcmgr) interpreter = PDFPageInterpreter(rsrcmgr, device) for pgnum, page in enumerate(PDFPage.create_pages(doc)): interpreter.process_page(page) page.annots and self.parse_annotations(pgnum, page) def parse_annotations(self, pgnum, page): annots = page.annots if isinstance(page.annots, PDFObjRef): annots = page.annots.resolve() annots = ( r.resolve() for r in annots if isinstance(r, PDFObjRef)) widgets = ( r for r in annots if r["Subtype"].name == "Widget") for ref in widgets: data_holder = ref try: name = ref["T"] except KeyError: ref = ref['Parent'].resolve() name = ref['T'] field = self.fields.setdefault(name, {"name": name, "page": pgnum}) allowed_fts = ("Btn", "Tx", "Ch", "Sig") if "FT" in data_holder and data_holder["FT"].name in allowed_fts: field["rect"] = data_holder["Rect"] if "TU" in ref: tmpl = ref["TU"] try: if ref["TU"].startswith(b"\xfe"): tmpl = tmpl.decode("utf-16") else: tmpl = tmpl.decode("utf-8") field["template"] = self.jinja_env.from_string(tmpl) except (UnicodeDecodeError, TemplateSyntaxError) as err: logger.error("%s: %s %s", name, tmpl, err) def template_args(self, data): kwargs = {} today = datetime.datetime.today().strftime("%m/%d/%y") kwargs.update({"today": today}) kwargs.update(data) return kwargs def format_date(self, datestr): if not datestr: return "" ts = time.strptime(datestr, "%Y-%m-%dT%H:%M:%S.%fZ") dt = datetime.datetime.fromtimestamp(time.mktime(ts)) return dt.strftime("%m/%d/%y") def exec_pdftk(self, data): fdf_kwargs = dict(checkbox_checked_name="Yes") fdf = forge_fdf("", data.items(), [], [], [], **fdf_kwargs) args = [ "pdftk", self.filename, "fill_form", "-", "output", "-", "dont_ask", "flatten" ] p = Popen(args, stdin=PIPE, stdout=PIPE, stderr=PIPE) stdout, stderr = p.communicate(fdf) if stderr.strip(): raise IOError(stderr) return BytesIO(stdout) def __call__(self, data, attachments=[], pages=None): self.rendered = {} for field, ctx in self.fields.items(): if "template" not in ctx: continue self.context = ctx kwargs = self.template_args(data) template = self.context["template"] try: rendered_field = template.render(**kwargs) except Exception as err: logger.error("%s: %s %s", field, template, err) else: # Skip the field if it is already rendered by filter if field not in self.rendered: if PY3: field = field.decode('utf-8') self.rendered[field] = rendered_field filled = PdfFileReader(self.exec_pdftk(self.rendered)) for pagenumber, watermark in self.watermarks: page = filled.getPage(pagenumber) page.mergePage(watermark) output = PdfFileWriter() pages = pages or range(filled.getNumPages()) for p in pages: output.addPage(filled.getPage(p)) for attachment in attachments: output.addBlankPage().mergePage(attachment.pdf()) return output def parse_args(description): parser = argparse.ArgumentParser(description=description) parser.add_argument( "-f", "--font", type=str, default=None, help="TTF font for attachment labels.") parser.add_argument( "-j", "--json", type=argparse.FileType("rb"), default=sys.stdin, help="JSON format file with data.") parser.add_argument( "-p", "--page", type=str, default=None, help="Pages to select (Comma separated).") parser.add_argument( "pdf", type=str, help="PDF form with jinja2 tooltips.") parser.add_argument( "out", nargs="?", type=argparse.FileType("wb"), default=sys.stdout, help="PDF filled with the form data.") return parser.parse_args() def main(): logging.basicConfig() args = parse_args(__doc__) pdfparser = PdfJinja(args.pdf) pages = args.page and args.page.split(",") import json json_data = args.json.read().decode('utf-8') data = json.loads(json_data) Attachment.font = args.font attachments = [ Attachment(**kwargs) for kwargs in data.pop("attachments", []) ] output = pdfparser(data, attachments, pages) output.write(args.out) if __name__ == "__main__": main()