new: [smtp-stub] new charm

smtp-stub/hooks/smtp_server-relation-joined

@@ -0,0 +1,28 @@
+#!/bin/bash
+
+set -e
+
+OPTS=(
+    host
+    port
+    connection-security
+    auth-method
+)
+for var in "${OPTS[@]}"; do
+    value=$(options-get "$var") && relation-set "$var" "$value" || exit 1
+    case "$var:$value" in
+        auth-method:password)
+            login=$(options-get "login") || {
+                err "${WHITE}login${NORMAL} value is required when ${WHITE}auth-method${NORMAL} is set to \"password\""
+                exit 1
+            }
+            password=$(options-get "password") || {
+                err "${WHITE}password${NORMAL} value is required when ${WHITE}auth-method${NORMAL} is set to \"password\""
+                exit 1
+            }
+            relation-set login "$login"
+            relation-set password "$password"
+            ;;
+    esac
+done
+

smtp-stub/metadata.yml

@@ -0,0 +1,11 @@
+type: stub
+
+provides:
+  smtp-server:
+
+default-options:
+  port: 25
+  connection-security: none    # "none", "starttls", "ssl/tls"
+  auth-method: none            # "none", "password"
+  user:
+  password: