feat: allow users to bind to all interfaces when a proxy is enabled

- use a plugin trigger to see whether we should bind to all interfaces
- create a generic way of setting properties for a plugin
- migrate proxy-enabled to the new network property "bind-all-interfaces"
- add network:set subcommand

plugins/common/properties.go

@@ -0,0 +1,181 @@
+package common
+
+import (
+	"fmt"
+	"io/ioutil"
+	"os"
+	"os/user"
+	"reflect"
+	"strconv"
+	"strings"
+)
+
+// CommandPropertySet is a generic function that will set a property for a given plugin/app combination
+func CommandPropertySet(pluginName string, appName string, property string, value string, validProperties map[string]bool) {
+	err := VerifyAppName(appName)
+	if err != nil {
+		LogFail(err.Error())
+	}
+
+	if property == "" {
+		LogFail("No property specified")
+	}
+
+	if !isValidProperty(validProperties, property) {
+		properties := reflect.ValueOf(validProperties).MapKeys()
+		validPropertyList := make([]string, len(properties))
+		for i := 0; i < len(properties); i++ {
+			validPropertyList[i] = properties[i].String()
+		}
+
+		LogFail(fmt.Sprintf("Invalid property specified, valid properties include: %s", strings.Join(validPropertyList, ", ")))
+	}
+
+	if value != "" {
+		LogInfo2Quiet(fmt.Sprintf("Setting %s to %s", property, value))
+		PropertyWrite(pluginName, appName, property, value)
+	} else {
+		LogInfo2Quiet(fmt.Sprintf("Unsetting %s", property))
+		PropertyDelete(pluginName, appName, property)
+	}
+}
+
+// PropertyDelete deletes a property from the plugin properties for an app
+func PropertyDelete(pluginName string, appName string, property string) {
+	pluginAppConfigRoot := getPluginAppPropertyPath(pluginName, appName)
+	propertyPath := strings.Join([]string{pluginAppConfigRoot, property}, "/")
+	err := os.Remove(propertyPath)
+	if err != nil {
+		LogFail(fmt.Sprintf("Unable to remove %s property %s.%s", pluginName, appName, property))
+	}
+}
+
+// PropertyDestroy destroys the plugin properties for an app
+func PropertyDestroy(pluginName string, appName string) {
+	if appName == "_all_" {
+		pluginConfigPath := getPluginConfigPath(pluginName)
+		os.RemoveAll(pluginConfigPath)
+	} else {
+		pluginAppConfigRoot := getPluginAppPropertyPath(pluginName, appName)
+		os.RemoveAll(pluginAppConfigRoot)
+	}
+}
+
+// PropertyExists returns whether a property exists or not
+func PropertyExists(pluginName string, appName string, property string) bool {
+	pluginAppConfigRoot := getPluginAppPropertyPath(pluginName, appName)
+	propertyPath := strings.Join([]string{pluginAppConfigRoot, property}, "/")
+	_, err := os.Stat(propertyPath)
+	return !os.IsNotExist(err)
+}
+
+// PropertyGet returns the value for a given property
+func PropertyGet(pluginName string, appName string, property string) string {
+	return PropertyGetDefault(pluginName, appName, property, "")
+}
+
+// PropertyGetDefault returns the value for a given property with a specified default value
+func PropertyGetDefault(pluginName string, appName string, property string, defaultValue string) string {
+	if !PropertyExists(pluginName, appName, property) {
+		return ""
+	}
+
+	pluginAppConfigRoot := getPluginAppPropertyPath(pluginName, appName)
+	propertyPath := strings.Join([]string{pluginAppConfigRoot, property}, "/")
+
+	b, err := ioutil.ReadFile(propertyPath)
+	if err != nil {
+		LogWarn(fmt.Sprintf("Unable to read %s property %s.%s", pluginName, appName, property))
+		return ""
+	}
+
+	return string(b)
+}
+
+// PropertyWrite writes a value for a given application property
+func PropertyWrite(pluginName string, appName string, property string, value string) {
+	err := makePropertyPath(pluginName, appName)
+	if err != nil {
+		LogFail(fmt.Sprintf("Unable to create %s config directory for %s: %s", pluginName, appName, err.Error()))
+	}
+
+	pluginAppConfigRoot := getPluginAppPropertyPath(pluginName, appName)
+	propertyPath := strings.Join([]string{pluginAppConfigRoot, property}, "/")
+	file, err := os.Create(propertyPath)
+	if err != nil {
+		LogFail(fmt.Sprintf("Unable to write %s config value %s.%s: %s", pluginName, appName, property, err.Error))
+	}
+	defer file.Close()
+
+	fmt.Fprintf(file, value)
+	file.Chmod(0600)
+	setPermissions(propertyPath, 0600)
+}
+
+// PropertySetup creates the plugin config root
+func PropertySetup(pluginName string) error {
+	pluginConfigRoot := getPluginConfigPath(pluginName)
+	err := os.MkdirAll(pluginConfigRoot, 0755)
+	if err != nil {
+		return err
+	}
+	return setPermissions(pluginConfigRoot, 0755)
+}
+
+// isValidProperty returns whether a property is a valid property or not
+func isValidProperty(validProperties map[string]bool, property string) bool {
+	return validProperties[property]
+}
+
+// getPluginAppPropertyPath returns the plugin property path for a given plugin/app combination
+func getPluginAppPropertyPath(pluginName string, appName string) string {
+	return strings.Join([]string{getPluginConfigPath(pluginName), appName}, "/")
+}
+
+// getPluginConfigPath returns the plugin property path for a given plugin
+func getPluginConfigPath(pluginName string) string {
+	return strings.Join([]string{MustGetEnv("DOKKU_LIB_ROOT"), "config", pluginName}, "/")
+}
+
+// makePropertyPath ensures that a property path exists
+func makePropertyPath(pluginName string, appName string) error {
+	pluginAppConfigRoot := getPluginAppPropertyPath(pluginName, appName)
+	err := os.MkdirAll(pluginAppConfigRoot, 0755)
+	if err != nil {
+		return err
+	}
+	return setPermissions(pluginAppConfigRoot, 0755)
+}
+
+// setPermissions sets the proper owner and filemode for a given file
+func setPermissions(path string, fileMode os.FileMode) error {
+	err := os.Chmod(path, fileMode)
+	if err != nil {
+		return err
+	}
+
+	group, err := user.LookupGroup("dokku")
+	if err != nil {
+		return err
+	}
+	user, err := user.Lookup("dokku")
+	if err != nil {
+		return err
+	}
+
+	uid, err := strconv.Atoi(user.Uid)
+	if err != nil {
+		return err
+	}
+
+	gid, err := strconv.Atoi(group.Gid)
+	if err != nil {
+		return err
+	}
+
+	err = os.Chown(path, uid, gid)
+	if err != nil {
+		return err
+	}
+	return nil
+}