fix: scw.File unmarshal

Signed-off-by: Patrik Cyvoct <pcyvoct@scaleway.com>

scw/custom_types.go

@@ -1,9 +1,11 @@
 package scw
 
 import (
+	"encoding/base64"
 	"encoding/json"
 	"fmt"
 	"io"
+	"strings"
 	"time"
 
 	"github.com/scaleway/scaleway-sdk-go/internal/errors"
@@ -37,6 +39,30 @@ type File struct {
 	Content io.Reader `json:"content"`
 }
 
+func (f *File) UnmarshalJSON(b []byte) error {
+	var tmpFile struct {
+		Name        string `json:"name"`
+		ContentType string `json:"content_type"`
+		Content     []byte `json:"content"`
+	}
+
+	err := json.Unmarshal(b, &tmpFile)
+	if err != nil {
+		return err
+	}
+
+	f.Name = tmpFile.Name
+	f.ContentType = tmpFile.ContentType
+
+	content, err := base64.StdEncoding.DecodeString(string(tmpFile.Content))
+	if err != nil {
+		return err
+	}
+	f.Content = strings.NewReader(string(content))
+
+	return nil
+}
+
 // Money represents an amount of money with its currency type.
 type Money struct {
 	// CurrencyCode is the 3-letter currency code defined in ISO 4217.