feat: read public key file

erpnext/erpnext_integrations/doctype/e_invoice_settings/e_invoice_settings.json

@@ -8,6 +8,7 @@
   "client_id",
   "client_secret",
   "public_key_file",
+  "public_key",
   "column_break_3",
   "gstin",
   "username",
@@ -54,12 +55,18 @@
    "fieldtype": "Password",
    "label": "Password",
    "reqd": 1
+  },
+  {
+   "fieldname": "public_key",
+   "fieldtype": "Long Text",
+   "hidden": 1,
+   "read_only": 1
   }
  ],
  "index_web_pages_for_search": 1,
  "issingle": 1,
  "links": [],
- "modified": "2020-09-25 21:19:17.159664",
+ "modified": "2020-09-25 21:24:00.404460",
  "modified_by": "Administrator",
  "module": "ERPNext Integrations",
  "name": "E Invoice Settings",

erpnext/erpnext_integrations/doctype/e_invoice_settings/e_invoice_settings.py

@@ -3,8 +3,19 @@
 # For license information, please see license.txt
 
 from __future__ import unicode_literals
-# import frappe
+import frappe
+from frappe.utils import cstr
 from frappe.model.document import Document
 
 class EInvoiceSettings(Document):
-	pass
+	def validate(self):
+		pass
+	
+	def before_save(self):
+		if not self.public_key or self.has_value_changed('public_key_file'):
+			self.public_key = self.read_key_file()
+
+	def read_key_file(self):
+		key_file = frappe.get_doc('File', dict(attached_to_name=self.doctype, attached_to_field='public_key_file'))
+		with open(key_file.get_full_path(), 'rb') as f:
+			return cstr(f.read())