mirror of
https://github.com/paperless-ngx/paperless-ngx.git
synced 2025-05-01 11:19:32 -05:00
310 lines
10 KiB
Python
310 lines
10 KiB
Python
import os
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import re
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from io import BytesIO
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from io import StringIO
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import requests
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from bleach import clean
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from bleach import linkify
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from django.conf import settings
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from documents.parsers import DocumentParser
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from documents.parsers import make_thumbnail_from_pdf
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from documents.parsers import ParseError
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from imap_tools import MailMessage
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from tika import parser
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class MailDocumentParser(DocumentParser):
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"""
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This parser sends documents to a local tika server
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"""
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logging_name = "paperless.parsing.mail"
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_parsed = None
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def get_parsed(self, document_path) -> MailMessage:
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if not self._parsed:
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try:
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with open(document_path, "rb") as eml:
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self._parsed = MailMessage.from_bytes(eml.read())
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except Exception as err:
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raise ParseError(
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f"Could not parse {document_path}: {err}",
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)
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return self._parsed
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def get_thumbnail(self, document_path, mime_type, file_name=None):
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if not self.archive_path:
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self.archive_path = self.generate_pdf(document_path)
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return make_thumbnail_from_pdf(
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self.archive_path,
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self.tempdir,
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self.logging_group,
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)
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def extract_metadata(self, document_path, mime_type):
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result = []
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try:
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mail = self.get_parsed(document_path)
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except ParseError as e:
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self.log(
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"warning",
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f"Error while fetching document metadata for " f"{document_path}: {e}",
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)
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return result
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for key, value in mail.headers.items():
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value = ", ".join(i for i in value)
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result.append(
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{
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"namespace": "",
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"prefix": "header",
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"key": key,
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"value": value,
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},
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)
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result.append(
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{
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"namespace": "",
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"prefix": "",
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"key": "attachments",
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"value": ", ".join(
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f"{attachment.filename}({(attachment.size / 1024):.2f} KiB)"
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for attachment in mail.attachments
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),
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},
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)
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result.append(
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{
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"namespace": "",
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"prefix": "",
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"key": "date",
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"value": mail.date.strftime("%Y-%m-%d %H:%M:%S %Z"),
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},
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)
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result.sort(key=lambda item: (item["prefix"], item["key"]))
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return result
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def parse(self, document_path, mime_type, file_name=None):
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def strip_content(text: str):
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text = re.sub("\t", " ", text)
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text = re.sub(" +", " ", text)
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text = re.sub("(\n *)+", "\n", text)
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return text.strip()
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mail = self.get_parsed(document_path)
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self.text = f"{strip_content(mail.text)}\n\n"
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self.text += f"Subject: {mail.subject}\n\n"
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self.text += f"From: {mail.from_values.full}\n\n"
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self.text += f"To: {', '.join(address.full for address in mail.to_values)}\n\n"
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if len(mail.cc_values) >= 1:
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self.text += (
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f"CC: {', '.join(address.full for address in mail.cc_values)}\n\n"
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)
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if len(mail.bcc_values) >= 1:
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self.text += (
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f"BCC: {', '.join(address.full for address in mail.bcc_values)}\n\n"
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)
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if len(mail.attachments) >= 1:
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att = ", ".join(f"{a.filename} ({a.size})" for a in mail.attachments)
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self.text += f"Attachments: {att}\n\n"
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if mail.html != "":
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self.text += "HTML content: " + strip_content(self.tika_parse(mail.html))
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self.date = mail.date
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self.archive_path = self.generate_pdf(document_path)
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def tika_parse(self, input):
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self.log("info", "Sending content to Tika server")
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tika_server = settings.PAPERLESS_TIKA_ENDPOINT
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try:
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parsed = parser.from_buffer(input, tika_server)
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except Exception as err:
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raise ParseError(
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f"Could not parse content with tika server at " f"{tika_server}: {err}",
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)
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if parsed["content"]:
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return parsed["content"]
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else:
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return ""
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def generate_pdf(self, document_path):
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def clean_html(text: str):
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if isinstance(text, list):
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text = "\n".join([str(e) for e in text])
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if type(text) != str:
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text = str(text)
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text = text.replace("&", "&")
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text = text.replace("<", "<")
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text = text.replace(">", ">")
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text = text.replace(" ", " ")
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text = text.replace("'", "'")
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text = text.replace('"', """)
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text = clean(text)
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text = linkify(text, parse_email=True)
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text = text.replace("\n", "<br>")
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return text
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def clean_html_script(text: str):
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text = text.replace("<script", "<div hidden ")
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text = text.replace("</script", "</div")
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return text
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mail = self.get_parsed(document_path)
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pdf_path = os.path.join(self.tempdir, "convert.pdf")
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gotenberg_server = settings.PAPERLESS_TIKA_GOTENBERG_ENDPOINT
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url = gotenberg_server + "/forms/chromium/convert/html"
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self.log("info", f"Converting {document_path} to PDF as {pdf_path}")
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data = {}
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data["subject"] = clean_html(mail.subject)
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if data["subject"] != "":
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data["subject_label"] = "Subject"
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data["from"] = clean_html(mail.from_values.full)
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if data["from"] != "":
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data["from_label"] = "From"
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data["to"] = clean_html("\n".join(address.full for address in mail.to_values))
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if data["to"] != "":
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data["to_label"] = "To"
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data["cc"] = clean_html("\n".join(address.full for address in mail.cc_values))
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if data["cc"] != "":
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data["cc_label"] = "CC"
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data["bcc"] = clean_html("\n".join(address.full for address in mail.bcc_values))
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if data["bcc"] != "":
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data["bcc_label"] = "BCC"
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data["date"] = clean_html(mail.date.astimezone().strftime("%Y-%m-%d %H:%M"))
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data["content"] = clean_html(mail.text.strip())
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html_file = os.path.join(os.path.dirname(__file__), "mail_template/index.html")
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css_file = os.path.join(os.path.dirname(__file__), "mail_template/output.css")
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placeholder_pattern = re.compile(r"{{(.+)}}")
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html = StringIO()
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with open(html_file, "r") as html_template_handle:
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with open(css_file, "rb") as css_handle:
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for line in html_template_handle.readlines():
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for placeholder in placeholder_pattern.findall(line):
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line = re.sub(
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"{{" + placeholder + "}}",
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data.get(placeholder.strip(), ""),
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line,
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)
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html.write(line)
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html.seek(0)
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files = {
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"html": (
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"index.html",
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html,
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),
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"css": (
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"output.css",
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css_handle,
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),
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}
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headers = {}
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data = {
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"marginTop": "0.1",
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"marginBottom": "0.1",
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"marginLeft": "0.1",
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"marginRight": "0.1",
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"paperWidth": "8.27",
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"paperHeight": "11.7",
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"scale": "1.0",
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}
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try:
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response = requests.post(
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url,
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files=files,
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headers=headers,
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data=data,
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)
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response.raise_for_status() # ensure we notice bad responses
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except Exception as err:
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raise ParseError(f"Error while converting document to PDF: {err}")
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if mail.html != "":
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pdf_html = self.generate_pdf_from_html(
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clean_html_script(mail.html),
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mail.attachments,
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)
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url_merge = gotenberg_server + "/forms/pdfengines/merge"
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files = {
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"mail": (
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"1_mail.pdf",
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BytesIO(response.content),
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),
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"html": (
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"2_html.pdf",
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BytesIO(pdf_html),
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),
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}
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headers = {}
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try:
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response = requests.post(
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url_merge,
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files=files,
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headers=headers,
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)
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response.raise_for_status() # ensure we notice bad responses
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except Exception as err:
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raise ParseError(f"Error while converting document to PDF: {err}")
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with open(pdf_path, "wb") as file:
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file.write(response.content)
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file.close()
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return pdf_path
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def generate_pdf_from_html(self, orig_html, attachments):
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gotenberg_server = settings.PAPERLESS_TIKA_GOTENBERG_ENDPOINT
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url = gotenberg_server + "/forms/chromium/convert/html"
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self.log("info", "Converting html to PDF")
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files = {}
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for a in attachments:
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name_cid = "cid:" + a.content_id
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name_clean = "".join(e for e in name_cid if e.isalnum())
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files[name_clean] = (name_clean, BytesIO(a.payload))
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orig_html = orig_html.replace(name_cid, name_clean)
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files["mail_html"] = ("index.html", StringIO(orig_html))
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headers = {}
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data = {
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"marginTop": "0.1",
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"marginBottom": "0.1",
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"marginLeft": "0.1",
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"marginRight": "0.1",
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"paperWidth": "8.27",
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"paperHeight": "11.7",
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"scale": "1.0",
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}
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try:
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response = requests.post(
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url,
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files=files,
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headers=headers,
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data=data,
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)
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response.raise_for_status() # ensure we notice bad responses
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except Exception as err:
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raise ParseError(f"Error while converting document to PDF: {err}")
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return response.content
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