77 lines
1.4 KiB
Go
77 lines
1.4 KiB
Go
package main
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import (
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"encoding/json"
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"fmt"
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"os"
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"regexp"
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"slices"
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"strconv"
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"strings"
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)
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type Config struct {
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Port int
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InitializeSlack bool
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SlackToken string
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SlackChannels string
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}
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func newConfig() (Config, error) {
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return newConfigFromEnv(os.Getenv)
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}
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func newConfigFromEnv(getEnv func(string) string) (Config, error) {
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def := Config{
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Port: 8080,
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}
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var m map[string]any
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if b, err := json.Marshal(def); err != nil {
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return Config{}, err
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} else if err := json.Unmarshal(b, &m); err != nil {
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return Config{}, err
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}
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re := regexp.MustCompile(`[A-Z]`)
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for k, v := range m {
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envK := k
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idxes := re.FindAllIndex([]byte(envK), -1)
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slices.Reverse(idxes)
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for _, idx := range idxes {
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if idx[0] > 0 {
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envK = fmt.Sprintf("%s_%s", envK[:idx[0]], envK[idx[0]:])
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}
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}
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envK = strings.ToUpper(envK)
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s := getEnv(envK)
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if s == "" {
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continue
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}
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switch v.(type) {
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case string:
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m[k] = s
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case int64, float64:
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n, err := strconv.ParseFloat(s, 32)
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if err != nil {
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return Config{}, err
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}
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m[k] = n
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case bool:
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got, err := strconv.ParseBool(s)
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if err != nil {
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return Config{}, err
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}
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m[k] = got
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}
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}
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var result Config
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if b, err := json.Marshal(m); err != nil {
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return Config{}, err
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} else if err := json.Unmarshal(b, &result); err != nil {
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return Config{}, err
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}
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return result, nil
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}
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