Speichere Konfiguration in config/config.json

config/config.go

@@ -0,0 +1,88 @@
+package config
+
+import (
+	"encoding/json"
+	"fmt"
+	"html/template"
+	"io/ioutil"
+	"log"
+)
+
+type Config struct {
+	Server struct {
+		ListenAddress string
+		ListenPort      int
+		Protocol      string
+		Domain        string
+	}
+	Date struct {
+		MinuteGranularity int
+	}
+	Request struct {
+		SecretLength int
+	}
+	Mailer struct {
+		Type         string
+		FromAddress  string
+		FromName     template.HTML
+		SmtpHost     string
+		SmtpPort     int
+		SmtpUseAuth  bool
+		SmtpIdentity string
+		SmtpPassword string
+	}
+	SQL struct {
+		Type          string
+		SQLiteFile    string
+		MysqlUser     string
+		MysqlPassword string
+		MysqlHost     string
+		MysqlPort     int
+		MysqlDatabase string
+	}
+}
+
+// ReadConfigFile takes a file path as an argument and attempts to
+// unmarshal the content of the file into a struct containing a
+// configuration.
+func ReadConfigFile(filename string, conf *Config) error {
+	configData, err := ioutil.ReadFile(filename)
+	if err != nil {
+		return err
+	}
+	err = json.Unmarshal(configData, conf)
+	if err != nil {
+		return err
+	}
+	return validateConfig(conf)
+}
+
+func validateConfig(conf *Config) error {
+	var err error
+	if !(conf.Server.ListenPort >= 1 && conf.Server.ListenPort <= 65535) {
+		err = fmt.Errorf("Validating config: Server port must be between 1 and 65535, but is %d.", conf.Server.ListenPort)
+		log.Println(err.Error())
+	}
+	if !(conf.Server.Protocol == "http" || conf.Server.Protocol == "https") {
+		err = fmt.Errorf("Validating config: Server protocol must be http or https, but is '%s'.", conf.Server.Protocol)
+		log.Println(err.Error())
+	}
+	if !(conf.Date.MinuteGranularity >= 1 && conf.Date.MinuteGranularity <= 60) {
+		err = fmt.Errorf("Validating config: Minute granularity must be between 1 and 60, but is %d.", conf.Date.MinuteGranularity)
+		log.Println(err.Error())
+	}
+	if !(conf.Request.SecretLength >= 5 && conf.Request.SecretLength <= 50) {
+		err = fmt.Errorf("Validating config: Requests' secret length must be between 5 and 50, but is %d.", conf.Request.SecretLength)
+		log.Println(err.Error())
+	}
+	if !(conf.Mailer.Type == "Stdout" || conf.Mailer.Type == "Smtp") {
+		err = fmt.Errorf("Validating config: Mailer type must be 'stdout' or 'smtp', but is '%s'.", conf.Mailer.Type)
+		log.Println(err.Error())
+	}
+	if !(conf.SQL.Type == "SQLite" || conf.SQL.Type == "Mysql") {
+		err = fmt.Errorf("Validating config: SQL type must be 'SQLite' or 'Mysql', but is '%s'.", conf.SQL.Type)
+		log.Println(err.Error())
+	}
+	return err
+
+}