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-rw-r--r--pkg/bindings/internal/util/util.go102
1 files changed, 102 insertions, 0 deletions
diff --git a/pkg/bindings/internal/util/util.go b/pkg/bindings/internal/util/util.go
new file mode 100644
index 000000000..c1961308e
--- /dev/null
+++ b/pkg/bindings/internal/util/util.go
@@ -0,0 +1,102 @@
+package util
+
+import (
+ "errors"
+ "fmt"
+ "net/url"
+ "reflect"
+ "strconv"
+ "strings"
+
+ jsoniter "github.com/json-iterator/go"
+)
+
+func IsSimpleType(f reflect.Value) bool {
+ if _, ok := f.Interface().(fmt.Stringer); ok {
+ return true
+ }
+
+ switch f.Kind() {
+ case reflect.Bool, reflect.Int, reflect.Int64, reflect.Uint, reflect.Uint64, reflect.String:
+ return true
+ }
+
+ return false
+}
+
+func SimpleTypeToParam(f reflect.Value) string {
+ if s, ok := f.Interface().(fmt.Stringer); ok {
+ return s.String()
+ }
+
+ switch f.Kind() {
+ case reflect.Bool:
+ return strconv.FormatBool(f.Bool())
+ case reflect.Int, reflect.Int64:
+ // f.Int() is always an int64
+ return strconv.FormatInt(f.Int(), 10)
+ case reflect.Uint, reflect.Uint64:
+ // f.Uint() is always an uint64
+ return strconv.FormatUint(f.Uint(), 10)
+ case reflect.String:
+ return f.String()
+ }
+
+ panic("the input parameter is not a simple type")
+}
+
+func Changed(o interface{}, fieldName string) bool {
+ r := reflect.ValueOf(o)
+ value := reflect.Indirect(r).FieldByName(fieldName)
+ return !value.IsNil()
+}
+
+func ToParams(o interface{}) (url.Values, error) {
+ params := url.Values{}
+ if o == nil || reflect.ValueOf(o).IsNil() {
+ return params, nil
+ }
+ json := jsoniter.ConfigCompatibleWithStandardLibrary
+ s := reflect.ValueOf(o)
+ if reflect.Ptr == s.Kind() {
+ s = s.Elem()
+ }
+ sType := s.Type()
+ for i := 0; i < s.NumField(); i++ {
+ fieldName := sType.Field(i).Name
+ if !Changed(o, fieldName) {
+ continue
+ }
+ fieldName = strings.ToLower(fieldName)
+ f := s.Field(i)
+ if reflect.Ptr == f.Kind() {
+ f = f.Elem()
+ }
+ switch {
+ case IsSimpleType(f):
+ params.Set(fieldName, SimpleTypeToParam(f))
+ case f.Kind() == reflect.Slice:
+ for i := 0; i < f.Len(); i++ {
+ elem := f.Index(i)
+ if IsSimpleType(elem) {
+ params.Add(fieldName, SimpleTypeToParam(elem))
+ } else {
+ return nil, errors.New("slices must contain only simple types")
+ }
+ }
+ case f.Kind() == reflect.Map:
+ lowerCaseKeys := make(map[string][]string)
+ iter := f.MapRange()
+ for iter.Next() {
+ lowerCaseKeys[iter.Key().Interface().(string)] = iter.Value().Interface().([]string)
+ }
+ s, err := json.MarshalToString(lowerCaseKeys)
+ if err != nil {
+ return nil, err
+ }
+
+ params.Set(fieldName, s)
+ }
+ }
+ return params, nil
+}