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fix(utils): decode padded URL-safe base64 values #31

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fix(utils): decode padded URL-safe base64 values #31

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9 changes: 6 additions & 3 deletions internal/utils/converter.go
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Original file line number Diff line number Diff line change
Expand Up @@ -204,9 +204,12 @@ func Base64DecodeConverter(value interface{}) interface{} {
}
decoded, err := base64.StdEncoding.DecodeString(str)
if err != nil || !utf8.Valid(decoded) {
// Fall back to raw URL-safe Base64 (no padding); some backends use
// URL-safe encoding without padding.
decoded, err = base64.RawURLEncoding.DecodeString(str)
// Fall back to URL-safe Base64. Some backends keep padding while others
// omit it, so support both variants before giving up.
decoded, err = base64.URLEncoding.DecodeString(str)
if err != nil || !utf8.Valid(decoded) {
decoded, err = base64.RawURLEncoding.DecodeString(str)
}
if err != nil || !utf8.Valid(decoded) {
return value
}
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5 changes: 5 additions & 0 deletions internal/utils/converter_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -636,6 +636,11 @@ func TestBase64DecodeConverter(t *testing.T) {
input: "aGVsbG8-d29ybGQ=", // URL-safe 编码
want: "hello>world",
},
{
name: "URL-safe Base64 无填充解码",
input: "aGVsbG8_d29ybGQ", // URL-safe 编码 (no padding)
want: "hello?world",
},
{
name: "非 Base64 字符串原样返回",
input: "not-base64-!!!",
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