initial code (#6)

* initial code commit

util/misc.go

@@ -0,0 +1,32 @@
+package util
+
+import (
+	"crypto/sha256"
+	"fmt"
+	"strconv"
+	"strings"
+)
+
+func Atoi(val string, defaultVal int) int {
+	n, err := strconv.Atoi(val)
+	if err != nil {
+		return defaultVal
+	}
+	return n
+}
+
+func Atof64(val string, defaultVal float64) float64 {
+	n, err := strconv.ParseFloat(strings.TrimSpace(val), 64)
+	if err != nil {
+		return defaultVal
+	}
+	return n
+}
+
+func AsSHA256(o interface{}) string {
+	// credits: https://blog.8bitzen.com/posts/22-08-2019-how-to-hash-a-struct-in-go
+	h := sha256.New()
+	h.Write([]byte(fmt.Sprintf("%v", o)))
+
+	return fmt.Sprintf("%x", h.Sum(nil))
+}

util/url.go

@@ -0,0 +1,24 @@
+package util
+
+import (
+	"fmt"
+	"net/url"
+	"path"
+	"strings"
+)
+
+func JoinURL(base string, paths ...string) string {
+	// credits: https://stackoverflow.com/a/57220413
+	p := path.Join(paths...)
+	return fmt.Sprintf("%s/%s", strings.TrimRight(base, "/"), strings.TrimLeft(p, "/"))
+}
+
+func URLWithQuery(base string, q url.Values) (string, error) {
+	u, err := url.Parse(base)
+	if err != nil {
+		return "", fmt.Errorf("url parse: %w", err)
+	}
+
+	u.RawQuery = q.Encode()
+	return u.String(), nil
+}