From 67ede5d5336f276f8a4c5f85ac7bc8cd0057efbc Mon Sep 17 00:00:00 2001
From: barredterra <14891507+barredterra@users.noreply.github.com>
Date: Wed, 14 Dec 2022 13:59:46 +0100
Subject: [PATCH] feat: add parameters language and letter_head to
 `download_pdf`

---
 frappe/translate.py          | 32 ++++++++++++++++++++++++++++++++
 frappe/utils/print_format.py | 13 ++++++++++---
 2 files changed, 42 insertions(+), 3 deletions(-)

diff --git a/frappe/translate.py b/frappe/translate.py
index 339ab6cb05..975d8f07f5 100644
--- a/frappe/translate.py
+++ b/frappe/translate.py
@@ -14,6 +14,7 @@ import json
 import operator
 import os
 import re
+from contextlib import contextmanager
 from csv import reader
 
 from babel.messages.extract import extract_python
@@ -1313,6 +1314,37 @@ def get_translated_doctypes():
 	return unique(dts + custom_dts)
 
 
+@contextmanager
+def print_language(language: str):
+	"""Ensure correct globals for printing in a specific language.
+
+	Usage:
+
+	```
+	with print_language("de"):
+	    html = frappe.get_print( ... )
+	```
+	"""
+	if not language or language == frappe.local.lang:
+		# do nothing
+		yield
+		return
+
+	# remember original values
+	_lang = frappe.local.lang
+	_jenv = frappe.local.jenv
+
+	# set language, empty any existing lang_full_dict and jenv
+	frappe.local.lang = language
+	frappe.local.jenv = None
+
+	yield
+
+	# restore original values
+	frappe.local.lang = _lang
+	frappe.local.jenv = _jenv
+
+
 # Backward compatibility
 get_full_dict = get_all_translations
 load_lang = get_translations_from_apps
diff --git a/frappe/utils/print_format.py b/frappe/utils/print_format.py
index 03d564b16c..2d6164e4bd 100644
--- a/frappe/utils/print_format.py
+++ b/frappe/utils/print_format.py
@@ -5,6 +5,7 @@ from PyPDF2 import PdfWriter
 import frappe
 from frappe import _
 from frappe.core.doctype.access_log.access_log import make_access_log
+from frappe.translate import print_language
 from frappe.utils.pdf import get_pdf
 
 no_cache = 1
@@ -118,15 +119,21 @@ def read_multi_pdf(output):
 
 
 @frappe.whitelist(allow_guest=True)
-def download_pdf(doctype, name, format=None, doc=None, no_letterhead=0):
+def download_pdf(
+	doctype, name, format=None, doc=None, no_letterhead=0, language=None, letter_head=None
+):
 	doc = doc or frappe.get_doc(doctype, name)
 	validate_print_permission(doc)
 
-	html = frappe.get_print(doctype, name, format, doc=doc, no_letterhead=no_letterhead)
+	with print_language(language):
+		pdf_file = frappe.get_print(
+			doctype, name, format, doc=doc, as_pdf=True, letterhead=letter_head, no_letterhead=no_letterhead
+		)
+
 	frappe.local.response.filename = "{name}.pdf".format(
 		name=name.replace(" ", "-").replace("/", "-")
 	)
-	frappe.local.response.filecontent = get_pdf(html)
+	frappe.local.response.filecontent = pdf_file
 	frappe.local.response.type = "pdf"