Merge pull request #1000 from kpumuk/hosts

Allow specifying multiple hosts for kamal-proxy via an array

lib/kamal/configuration.rb

@@ -360,7 +360,7 @@ class Kamal::Configuration
     end
 
     def ensure_unique_hosts_for_ssl_roles
-      hosts = roles.select(&:ssl?).map { |role| role.proxy.host }
+      hosts = roles.select(&:ssl?).flat_map { |role| role.proxy.hosts }
       duplicates = hosts.tally.filter_map { |host, count| host if count > 1 }
 
       raise Kamal::ConfigurationError, "Different roles can't share the same host for SSL: #{duplicates.join(", ")}" if duplicates.any?

lib/kamal/configuration/docs/proxy.yml

@@ -17,16 +17,19 @@
 # `proxy: true` or providing a proxy configuration.
 proxy:
 
-  # Host
+  # Hosts
   #
   # The hosts that will be used to serve the app. The proxy will only route requests
   # to this host to your app.
   #
   # If no hosts are set, then all requests will be forwarded, except for matching
   # requests for other apps deployed on that server that do have a host set.
+  #
+  # Specify one of `host` or `hosts`.
   host: foo.example.com
-  # If multiple hosts are needed, these can be specified by comma-separating the hosts.
-  host: foo.example.com,bar.example.com
+  hosts:
+    - foo.example.com
+    - bar.example.com
 
   # App port
   #

lib/kamal/configuration/proxy.rb

@@ -22,13 +22,13 @@ class Kamal::Configuration::Proxy
     proxy_config.fetch("ssl", false)
   end
 
-  def host
-    proxy_config["host"]
+  def hosts
+    proxy_config["hosts"] || proxy_config["host"]&.split(",") || []
   end
 
   def deploy_options
     {
-      host: proxy_config["host"],
+      host: hosts,
       tls: proxy_config["ssl"] ? true : nil,
       "deploy-timeout": seconds_duration(config.deploy_timeout),
       "drain-timeout": seconds_duration(config.drain_timeout),

lib/kamal/configuration/validator/proxy.rb

@@ -3,9 +3,13 @@ class Kamal::Configuration::Validator::Proxy < Kamal::Configuration::Validator
     unless config.nil?
       super
 
-      if config["host"].blank? && config["ssl"]
+      if config["host"].blank? && config["hosts"].blank? && config["ssl"]
         error "Must set a host to enable automatic SSL"
       end
+
+      if (config.keys & [ "host", "hosts" ]).size > 1
+        error "Specify one of 'host' or 'hosts', not both"
+      end
     end
   end
 end