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package motd
import (
"encoding/json"
"io/ioutil"
"log"
"os"
"time"
)
const TimeString = "02 Jan 06 15:04 -0700" // RFC822 with numeric zone
const ExampleFile = "motd-example.json"
func ParseFile(f string) (Messages, error) {
jsonFile, err := os.Open(f)
if err != nil {
panic(err)
}
defer jsonFile.Close()
byteVal, err := ioutil.ReadAll(jsonFile)
if err != nil {
panic(err)
}
return getFromJSON(byteVal)
}
func getFromJSON(b []byte) (Messages, error) {
var m Messages
json.Unmarshal(b, &m)
return m, nil
}
type Messages struct {
Messages []Message `json:"motd"`
}
func (m *Messages) Length() int {
return len(m.Messages)
}
type Message struct {
Begin string `json:"begin"`
End string `json:"end"`
Type string `json:"type"`
Platform string `json:"platform"`
Urgency string `json:"urgency"`
Text []LocalizedText `json:"text"`
}
type LocalizedText struct {
Lang string `json:"lang"`
Str string `json:"str"`
}
func (m *Message) IsValid() bool {
valid := (m.IsValidBegin() && m.IsValidEnd() &&
m.IsValidType() && m.IsValidPlatform() && m.IsValidUrgency() &&
m.HasLocalizedText())
return valid
}
func (m *Message) IsValidBegin() bool {
_, err := time.Parse(TimeString, m.Begin)
if err != nil {
log.Println(err)
return false
}
return true
}
func (m *Message) IsValidEnd() bool {
endTime, err := time.Parse(TimeString, m.End)
if err != nil {
log.Println(err)
return false
}
beginTime, err := time.Parse(TimeString, m.Begin)
if err != nil {
log.Println(err)
return false
}
if !beginTime.Before(endTime) {
log.Println("begin ts should be before end")
return false
}
return true
}
func (m *Message) IsValidType() bool {
switch m.Type {
case "once", "daily":
return true
default:
return false
}
}
func (m *Message) IsValidPlatform() bool {
switch m.Platform {
case "windows", "linux", "osx", "all":
return true
default:
return false
}
}
func (m *Message) IsValidUrgency() bool {
switch m.Urgency {
case "normal", "critical":
return true
default:
return false
}
}
func (m *Message) HasLocalizedText() bool {
return len(m.Text) > 0
}
|
