chore: warn if wkhtmltopdf is invalid

frappe/printing/page/print/print.js

@@ -603,7 +603,26 @@ frappe.ui.form.PrintView = class {
 			},
 		});
 	}
-
+	async is_wkhtmltopdf_valid() {
+		const is_valid = await frappe.call({
+			method: "frappe.utils.pdf.is_wkhtmltopdf_valid",
+		});
+		// function returns true or false
+		if (is_valid.message) return;
+		frappe.msgprint({
+			title: __("Invalid wkhtmltopdf version"),
+			message:
+				__("PDF generation may not work as expected.") +
+				"<hr/>" +
+				__("Please contact your system manager to install correct version.") +
+				"<br/>" +
+				__("Correct version :") +
+				" <b><a href ='https://wkhtmltopdf.org/downloads.html'>" +
+				__("wkhtmltopdf 0.12.x (with patched qt).") +
+				"</a></b>",
+			indicator: "red",
+		});
+	}
 	render_pdf() {
 		let print_format = this.get_print_format();
 		if (print_format.print_format_builder_beta) {
@@ -619,6 +638,7 @@ frappe.ui.form.PrintView = class {
 				return;
 			}
 		} else {
+			this.is_wkhtmltopdf_valid();
 			this.render_page("/api/method/frappe.utils.print_format.download_pdf?");
 		}
 	}

frappe/utils/pdf.py

@@ -352,6 +352,21 @@ def toggle_visible_pdf(soup):
 		tag.extract()
 
 
+@frappe.whitelist()
+def is_wkhtmltopdf_valid():
+	is_wkhtmltopdf_valid = frappe.cache.hget("is_wkhtmltopdf_valid", None)
+
+	if not is_wkhtmltopdf_valid:
+		try:
+			res = subprocess.check_output(["wkhtmltopdf", "--version"])
+			is_wkhtmltopdf_valid = True if "qt" in res.decode("utf-8").lower() else False
+			frappe.cache.hset("is_wkhtmltopdf_valid", None, is_wkhtmltopdf_valid)
+		except Exception:
+			pass
+
+	return is_wkhtmltopdf_valid
+
+
 def get_wkhtmltopdf_version():
 	wkhtmltopdf_version = frappe.cache.hget("wkhtmltopdf_version", None)