add url util

helper/url/url.go

@@ -0,0 +1,74 @@
+package url
+
+import (
+	"net/url"
+	"os"
+)
+
+type (
+	Options struct {
+		Schema   string
+		Host     string
+		Path     string // encoded query values, without '?'
+		Fragment string // fragment for references, without '#'
+		Params   map[string]string
+	}
+	Option func(o *Options)
+)
+
+func newOptions() *Options {
+	return &Options{
+		Schema: "https",
+		Host:   os.Getenv("DOMAIN_NAME"),
+		Params: make(map[string]string),
+	}
+}
+
+func WithSchema(schema string) Option {
+	return func(o *Options) {
+		o.Schema = schema
+	}
+}
+
+func WithFragment(fragment string) Option {
+	return func(o *Options) {
+		o.Fragment = fragment
+	}
+}
+
+func WithHost(host string) Option {
+	return func(o *Options) {
+		o.Host = host
+	}
+}
+
+func WithPath(path string) Option {
+	return func(o *Options) {
+		o.Path = path
+	}
+}
+
+func WithParams(ps map[string]string) Option {
+	return func(o *Options) {
+		o.Params = ps
+	}
+}
+
+func Create(opts ...Option) string {
+	o := newOptions()
+	for _, cb := range opts {
+		cb(o)
+	}
+	qs := url.Values{}
+	for k, v := range o.Params {
+		qs.Set(k, v)
+	}
+	uri := url.URL{
+		Scheme:     o.Schema,
+		Host:       o.Host,
+		Path:       o.Path,
+		ForceQuery: true,
+		RawQuery:   qs.Encode(),
+	}
+	return uri.String()
+}