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