fix(config): lua 5.1 compatibility and multi-tenant validation

- Replace goto statements with if-not pattern for Lua 5.1 compatibility
- Validate mail config only for API keys with mail:send permissions
- Safe display of API key info for monitoring keys without mail config
- Fix health check SMTP detection for new config structure
- Multi-tenant system tested and working on port 7811

Fixes multi-tenant config parsing, validation, and health checks.
Related to DAW/furt#89

.gitignore

@@ -56,3 +56,4 @@ debug.log
 config.local.lua
 config.production.lua
 
+config/furt.conf

config/server.lua

@@ -67,11 +67,28 @@ print("  Default SMTP: " .. (config.smtp_default.host or "not configured"))
 local api_key_count = 0
 for key_name, key_config in pairs(config.api_keys) do
     api_key_count = api_key_count + 1
+
+    -- Check if this API key has mail permissions
+    local has_mail_permission = false
+    if key_config.permissions then
+        for _, perm in ipairs(key_config.permissions) do
+            if perm == "mail:send" or perm == "*" then
+                has_mail_permission = true
+                break
+            end
+        end
+    end
+
     local smtp_info = ""
     if key_config.mail_smtp_host then
         smtp_info = " (custom SMTP: " .. key_config.mail_smtp_host .. ")"
     end
+
+    if has_mail_permission then
         print("  API Key: " .. key_config.name .. " -> " .. key_config.mail_to .. smtp_info)
+    else
+        print("  API Key: " .. key_config.name .. " (no mail)" .. smtp_info)
+    end
 end
 print("  Total API Keys: " .. api_key_count)
 

src/config_parser.lua

@@ -1,6 +1,7 @@
 -- src/config_parser.lua
 -- nginx-style configuration parser for Multi-Tenant setup
 -- Dragons@Work Digital Sovereignty Project
+-- Lua 5.1 compatible (no goto statements)
 
 local ConfigParser = {}
 
@@ -26,10 +27,7 @@ function ConfigParser.parse_file(config_path)
 
         -- Skip empty lines and comments
         line = line:match("^%s*(.-)%s*$") -- trim whitespace
-        if line == "" or line:match("^#") then
-            goto continue
-        end
-
+        if not (line == "" or line:match("^#")) then
             -- Section headers: [section] or [api_key "keyname"]
             local section_match = line:match("^%[([^%]]+)%]$")
             if section_match then
@@ -49,9 +47,7 @@ function ConfigParser.parse_file(config_path)
                         config[current_section] = {}
                     end
                 end
-            goto continue
-        end
-
+            else
                 -- Key-value pairs: key = value
                 local key, value = line:match("^([^=]+)=(.+)$")
                 if key and value then
@@ -71,8 +67,8 @@ function ConfigParser.parse_file(config_path)
                 else
                     error(string.format("Invalid line format at line %d: %s", line_number, line))
                 end
-
-        ::continue::
+            end
+        end
     end
 
     file:close()
@@ -163,7 +159,18 @@ function ConfigParser.validate_config(config)
             key_config.allowed_ips = {} -- no IP restrictions
         end
 
-        -- Validate mail configuration
+        -- Validate mail configuration only if API key has mail:send permission
+        local has_mail_permission = false
+        if key_config.permissions then
+            for _, perm in ipairs(key_config.permissions) do
+                if perm == "mail:send" or perm == "*" then
+                    has_mail_permission = true
+                    break
+                end
+            end
+        end
+
+        if has_mail_permission then
             if not key_config.mail_to then
                 error("API key '" .. key_name .. "' missing mail_to")
             end
@@ -172,6 +179,7 @@ function ConfigParser.validate_config(config)
                 error("API key '" .. key_name .. "' missing mail_from")
             end
         end
+    end
 
     -- Set SMTP defaults if not configured
     if not config.smtp_default.host then

src/main.lua

@@ -285,7 +285,7 @@ server:add_route("GET", "/health", function(request, server)
         timestamp = os.time(),
         source = version_info.source,
         features = {
-            smtp_configured = config.mail and config.mail.username ~= nil,
+            smtp_configured = config.smtp_default and config.smtp_default.host ~= nil,
             auth_enabled = true,
             rate_limiting = true,
             merkwerk_integrated = version_info.source == "merkwerk"