Initial commit

Signed-off-by: Julien Riou <julien@riou.xyz>

src/internal/utils.go

@@ -0,0 +1,101 @@
+package internal
+
+import (
+	"encoding/json"
+	"fmt"
+	"math/rand"
+	"os"
+	"path/filepath"
+	"regexp"
+)
+
+func ReadConfig(file string, config interface{}) error {
+	file, err := filepath.Abs(file)
+	if err != nil {
+		return err
+	}
+
+	jsonFile, err := os.ReadFile(file)
+	if err != nil {
+		return err
+	}
+
+	err = json.Unmarshal(jsonFile, &config)
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+func Version(appName, appVersion, gitCommit, goVersion string) string {
+	version := appName
+	if appVersion != "" {
+		version += " " + appVersion
+	}
+	if gitCommit != "" {
+		version += "-" + gitCommit
+	}
+	if goVersion != "" {
+		version += " (compiled with Go " + goVersion + ")"
+	}
+	return version
+}
+
+func ShowVersion(appName, appVersion, gitCommit, goVersion string) {
+	fmt.Print(Version(appName, appVersion, gitCommit, goVersion) + "\n")
+}
+
+const randomChars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
+
+func GenerateChars(n int) string {
+	b := make([]byte, n)
+	for i := range b {
+		b[i] = randomChars[rand.Intn(len(randomChars))]
+	}
+	return string(b)
+}
+
+// Passwords must be URL compatible and strong enough
+// Requiring only alphanumeric chars with a size between 16 and 256
+var passwordRegexp = regexp.MustCompile("^[a-zA-Z0-9]{16,256}$")
+
+func ValidatePassword(p string) error {
+	if !passwordRegexp.MatchString(p) {
+		return fmt.Errorf("password doesn't match '%s'", passwordRegexp)
+	}
+	return nil
+}
+
+// HumanDuration converts number of seconds to a human friendly format
+// Ex: 3600 -> "1 hour"
+// Yes it uses rough approximations ¯\_(ツ)_/¯
+func HumanDuration(i int) string {
+	var w string
+	if i < 0 {
+		return ""
+	} else if i >= 0 && i < 60 {
+		w = "second"
+	} else if i >= 60 && i < 60*60 {
+		i = i / 60
+		w = "minute"
+	} else if i >= 60*60 && i < 60*60*24 {
+		w = "hour"
+		i = i / (60 * 60)
+	} else if i >= 60*60*24 && i < 60*60*24*7 {
+		w = "day"
+		i = i / (60 * 60 * 24)
+	} else if i >= 60*60*24*7 && i < 60*60*24*31 {
+		w = "week"
+		i = i / (60 * 60 * 24 * 7)
+	} else if i >= 60*60*24*31 && i < 60*60*24*365 {
+		w = "month"
+		i = i / (60 * 60 * 24 * 31)
+	} else {
+		w = "year"
+		i = i / (60 * 60 * 24 * 365)
+	}
+	if i > 1 {
+		w = w + "s"
+	}
+	return fmt.Sprintf("%d %s", i, w)
+}