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112 lines
2.9 KiB
Go
112 lines
2.9 KiB
Go
// Copyright 2020 The Gitea Authors. All rights reserved.
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// SPDX-License-Identifier: MIT
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package json
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import (
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"bytes"
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"encoding/binary"
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"encoding/json" //nolint:depguard // this package wraps it
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"io"
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)
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// Encoder represents an encoder for json
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type Encoder interface {
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Encode(v any) error
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}
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// Decoder represents a decoder for json
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type Decoder interface {
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Decode(v any) error
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}
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// Interface represents an interface to handle json data
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type Interface interface {
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Marshal(v any) ([]byte, error)
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Unmarshal(data []byte, v any) error
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NewEncoder(writer io.Writer) Encoder
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NewDecoder(reader io.Reader) Decoder
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Indent(dst *bytes.Buffer, src []byte, prefix, indent string) error
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}
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var DefaultJSONHandler = getDefaultJSONHandler()
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// Marshal converts object as bytes
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func Marshal(v any) ([]byte, error) {
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return DefaultJSONHandler.Marshal(v)
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}
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// Unmarshal decodes object from bytes
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func Unmarshal(data []byte, v any) error {
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return DefaultJSONHandler.Unmarshal(data, v)
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}
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// NewEncoder creates an encoder to write objects to writer
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func NewEncoder(writer io.Writer) Encoder {
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return DefaultJSONHandler.NewEncoder(writer)
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}
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// NewDecoder creates a decoder to read objects from reader
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func NewDecoder(reader io.Reader) Decoder {
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return DefaultJSONHandler.NewDecoder(reader)
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}
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// Indent appends to dst an indented form of the JSON-encoded src.
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func Indent(dst *bytes.Buffer, src []byte, prefix, indent string) error {
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return DefaultJSONHandler.Indent(dst, src, prefix, indent)
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}
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// MarshalIndent copied from encoding/json
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func MarshalIndent(v any, prefix, indent string) ([]byte, error) {
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b, err := Marshal(v)
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if err != nil {
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return nil, err
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}
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var buf bytes.Buffer
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err = Indent(&buf, b, prefix, indent)
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if err != nil {
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return nil, err
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}
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return buf.Bytes(), nil
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}
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// Valid proxy to json.Valid
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func Valid(data []byte) bool {
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return json.Valid(data)
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}
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// UnmarshalHandleDoubleEncode - due to a bug in xorm (see https://gitea.com/xorm/xorm/pulls/1957) - it's
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// possible that a Blob may be double encoded or gain an unwanted prefix of 0xff 0xfe.
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func UnmarshalHandleDoubleEncode(bs []byte, v any) error {
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if len(bs) == 0 {
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// json.Unmarshal will report errors if input is empty (nil or zero-length)
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// It seems that XORM ignores the nil but still passes zero-length string into this function
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// To be consistent, we should treat all empty inputs as success
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return nil
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}
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err := json.Unmarshal(bs, v)
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if err != nil {
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ok := true
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rs := []byte{}
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temp := make([]byte, 2)
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for _, rn := range string(bs) {
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if rn > 0xffff {
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ok = false
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break
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}
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binary.LittleEndian.PutUint16(temp, uint16(rn))
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rs = append(rs, temp...)
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}
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if ok {
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if len(rs) > 1 && rs[0] == 0xff && rs[1] == 0xfe {
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rs = rs[2:]
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}
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err = json.Unmarshal(rs, v)
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}
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}
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if err != nil && len(bs) > 2 && bs[0] == 0xff && bs[1] == 0xfe {
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err = json.Unmarshal(bs[2:], v)
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}
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return err
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}
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