--- /dev/null
+--[[
+LuCI - Lua Configuration Interface
+
+Copyright 2016 Toke Høiland-Jørgensen <toke@toke.dk>
+
+# This program is free software; you can redistribute it and/or modify it under
+# the terms of the GNU General Public License as published by the Free Software
+# Foundation; either version 3 of the License, or (at your option) any later
+# version.
+
+]]--
+
+local fs = require "nixio.fs"
+
+local nginx_presence = fs.access("/usr/sbin/nginx") or false
+local uhttpd_presence = fs.access("/usr/sbin/uhttpd") or false
+
+m = Map("acme", translate("ACME certificates"),
+ translate("This configures ACME (Letsencrypt) automatic certificate installation. " ..
+ "Simply fill out this to have the router configured with Letsencrypt-issued " ..
+ "certificates for the web interface. " ..
+ "Note that the domain names in the certificate must already be configured to " ..
+ "point at the router's public IP address. " ..
+ "Once configured, issuing certificates can take a while. " ..
+ "Check the logs for progress and any errors."))
+
+s = m:section(TypedSection, "acme", translate("ACME global config"))
+s.anonymous = true
+
+st = s:option(Value, "state_dir", translate("State directory"),
+ translate("Where certs and other state files are kept."))
+st.rmempty = false
+st.datatype = "directory"
+
+ae = s:option(Value, "account_email", translate("Account email"),
+ translate("Email address to associate with account key."))
+ae.rmempty = false
+ae.datatype = "minlength(1)"
+
+d = s:option(Flag, "debug", translate("Enable debug logging"))
+d.rmempty = false
+
+cs = m:section(TypedSection, "cert", translate("Certificate config"))
+cs.anonymous = false
+cs.addremove = true
+
+e = cs:option(Flag, "enabled", translate("Enabled"))
+e.rmempty = false
+
+us = cs:option(Flag, "use_staging", translate("Use staging server"),
+ translate("Get certificate from the Letsencrypt staging server " ..
+ "(use for testing; the certificate won't be valid)."))
+us.rmempty = false
+
+kl = cs:option(ListValue, "keylength", translate("Key size"),
+ translate("Key size (and type) for the generated certificate."))
+kl:value("2048", "RSA 2048 bits")
+kl:value("3072", "RSA 3072 bits")
+kl:value("4096", "RSA 4096 bits")
+kl:value("ec-256", "ECC 256 bits")
+kl:value("ec-384", "ECC 384 bits")
+kl.default = "2048"
+kl.rmempty = false
+
+if uhttpd_presence then
+u = cs:option(Flag, "update_uhttpd", translate("Use for uhttpd"),
+ translate("Update the uhttpd config with this certificate once issued " ..
+ "(only select this for one certificate)." ..
+ "Is also available luci-app-uhttpd to configure uhttpd form the LuCI interface."))
+u.rmempty = false
+end
+
+if nginx_presence then
+u = cs:option(Flag, "update_nginx", translate("Use for nginx"),
+ translate("Update the nginx config with this certificate once issued " ..
+ "(only select this for one certificate)." ..
+ "Nginx must support ssl, if not it won't start as it needs to be " ..
+ "compiled with ssl support to use cert options"))
+u.rmempty = false
+end
+
+wr = cs:option(Value, "webroot", translate("Webroot directory"),
+ translate("Webserver root directory. Set this to the webserver " ..
+ "document root to run Acme in webroot mode. The web " ..
+ "server must be accessible from the internet on port 80."))
+wr.optional = true
+
+dom = cs:option(DynamicList, "domains", translate("Domain names"),
+ translate("Domain names to include in the certificate. " ..
+ "The first name will be the subject name, subsequent names will be alt names. " ..
+ "Note that all domain names must point at the router in the global DNS."))
+dom.datatype = "list(string)"
+
+dns = cs:option(Value, "dns", translate("DNS API"),
+ translate("To use DNS mode to issue certificates, set this to the name of a DNS API supported by acme.sh. " ..
+ "See https://github.com/Neilpang/acme.sh/tree/master/dnsapi for the list of available APIs. " ..
+ "In DNS mode, the domain name does not have to resolve to the router IP. " ..
+ "DNS mode is also the only mode that supports wildcard certificates. " ..
+ "Using this mode requires the acme-dnsapi package to be installed."))
+dns.optional = true
+
+cred = cs:option(DynamicList, "credentials", translate("DNS API credentials"),
+ translate("The credentials for the DNS API mode selected above. " ..
+ "See https://github.com/Neilpang/acme.sh/tree/master/dnsapi#how-to-use-dns-api for the format of credentials required by each API. " ..
+ "Add multiple entries here in KEY=VAL shell variable format to supply multiple credential variables."))
+cred.datatype = "list(string)"
+
+return m