feat: initial commit

internal/http/url/mutation.go

@@ -0,0 +1,110 @@
+package url
+
+import (
+	"errors"
+	"net/url"
+	"path/filepath"
+	"slices"
+)
+
+type URL = url.URL
+
+var Parse = url.Parse
+
+func Mutate(u *url.URL, funcs ...MutationFunc) *url.URL {
+	cloned := clone(u)
+
+	for _, fn := range funcs {
+		fn(cloned)
+	}
+
+	return cloned
+}
+
+type MutationFunc func(u *url.URL)
+
+func keyValuesToValues(kv []string) url.Values {
+	if len(kv)%2 != 0 {
+		panic(errors.New("expected pair number of key/values"))
+	}
+
+	values := make(url.Values)
+
+	var key string
+	for idx := range kv {
+		if idx%2 == 0 {
+			key = kv[idx]
+			continue
+		}
+
+		values.Add(key, kv[idx])
+	}
+
+	return values
+}
+
+func WithValues(kv ...string) MutationFunc {
+	values := keyValuesToValues(kv)
+
+	return func(u *url.URL) {
+		query := u.Query()
+
+		for k, vv := range values {
+			for _, v := range vv {
+				query.Add(k, v)
+			}
+		}
+
+		u.RawQuery = query.Encode()
+	}
+}
+
+func WithValuesReset() MutationFunc {
+	return func(u *url.URL) {
+		u.RawQuery = ""
+	}
+}
+
+func WithoutValues(kv ...string) MutationFunc {
+	toDelete := keyValuesToValues(kv)
+
+	return func(u *url.URL) {
+		query := u.Query()
+
+		for keyToDelete, valuesToDelete := range toDelete {
+			values, keyExists := query[keyToDelete]
+			if !keyExists {
+				continue
+			}
+
+			for _, d := range valuesToDelete {
+				if d == "*" {
+					query.Del(keyToDelete)
+					break
+				}
+
+				query[keyToDelete] = slices.DeleteFunc(values, func(value string) bool {
+					return value == d
+				})
+			}
+		}
+		u.RawQuery = query.Encode()
+	}
+}
+
+func WithPath(paths ...string) MutationFunc {
+	return func(u *url.URL) {
+		u.Path = filepath.Join(paths...)
+	}
+}
+
+func applyURLMutations(u *url.URL, funcs []MutationFunc) {
+	for _, fn := range funcs {
+		fn(u)
+	}
+}
+
+func clone[T any](v *T) *T {
+	copy := *v
+	return &copy
+}