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// SPDX-FileCopyrightText: 2020 Ethel Morgan
//
// SPDX-License-Identifier: MIT
package config
import (
"encoding/json"
"errors"
"io/ioutil"
"net/url"
)
type (
Rule struct {
Name string
Triggers []Trigger
Actions []Action
}
Trigger struct {
URL *url.URL
FormValues url.Values
}
ActionKind int
Action struct {
Kind ActionKind
Name string
URL *url.URL
FormValues url.Values
MQTT *url.URL
Value string
}
Config struct {
RulesByName map[string]Rule
}
config struct {
Rules map[string]struct {
Triggers []struct {
URL uurl `json:"url"`
FormValues map[string]string `json:"formValues"`
} `json:"triggers"`
Actions []struct {
URL uurl `json:"url"`
FormValues map[string]string `json:"formValues"`
MQTT uurl `json:"mqtt"`
Value string `json:"value"`
} `json:"actions"`
} `json:"rules"`
}
uurl struct {
*url.URL
}
)
const (
HTTPAction ActionKind = iota
MQTTAction
)
func ParseFile(path string) (*Config, error) {
bytes, err := ioutil.ReadFile(path)
if err != nil {
return nil, err
}
raw := config{}
if err := json.Unmarshal(bytes, &raw); err != nil {
return nil, err
}
return configFromConfig(raw)
}
func configFromConfig(raw config) (*Config, error) {
c := &Config{
RulesByName: map[string]Rule{},
}
for k, v := range raw.Rules {
rule := Rule{
Name: k,
}
for _, rawTrigger := range v.Triggers {
trigger := Trigger{
URL: rawTrigger.URL.URL,
FormValues: urlValuesFromRawValues(rawTrigger.FormValues),
}
rule.Triggers = append(rule.Triggers, trigger)
}
for _, rawAction := range v.Actions {
action := Action{
URL: rawAction.URL.URL,
FormValues: urlValuesFromRawValues(rawAction.FormValues),
MQTT: rawAction.MQTT.URL,
Value: rawAction.Value,
}
switch {
case action.URL != nil && action.MQTT == nil:
action.Kind = HTTPAction
case action.URL == nil && action.MQTT != nil:
action.Kind = MQTTAction
default:
return nil, errors.New("actions must be URL xor MQTT")
}
rule.Actions = append(rule.Actions, action)
}
c.RulesByName[k] = rule
}
return c, nil
}
func (u uurl) MarshalText() ([]byte, error) {
return []byte(u.String()), nil
}
func (u *uurl) UnmarshalText(raw []byte) error {
uu, err := url.Parse(string(raw))
if err != nil {
return err
}
u.URL = uu
return nil
}
func urlValuesFromRawValues(raw map[string]string) url.Values {
urlValues := map[string][]string{}
for k, v := range raw {
urlValues[k] = []string{v}
}
return urlValues
}
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