100 lines
2.9 KiB
Go
100 lines
2.9 KiB
Go
package jsonutil
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import (
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"bytes"
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"compress/gzip"
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"encoding/json"
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"fmt"
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"io"
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"github.com/hashicorp/vault/helper/compressutil"
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)
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// Encodes/Marshals the given object into JSON
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func EncodeJSON(in interface{}) ([]byte, error) {
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if in == nil {
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return nil, fmt.Errorf("input for encoding is nil")
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}
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var buf bytes.Buffer
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enc := json.NewEncoder(&buf)
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if err := enc.Encode(in); 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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// EncodeJSONAndCompress encodes the given input into JSON and compresses the
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// encoded value (using Gzip format BestCompression level, by default). A
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// canary byte is placed at the beginning of the returned bytes for the logic
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// in decompression method to identify compressed input.
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func EncodeJSONAndCompress(in interface{}, config *compressutil.CompressionConfig) ([]byte, error) {
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if in == nil {
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return nil, fmt.Errorf("input for encoding is nil")
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}
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// First JSON encode the given input
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encodedBytes, err := EncodeJSON(in)
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if err != nil {
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return nil, err
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}
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if config == nil {
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config = &compressutil.CompressionConfig{
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Type: compressutil.CompressionTypeGzip,
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GzipCompressionLevel: gzip.BestCompression,
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}
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}
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return compressutil.Compress(encodedBytes, config)
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}
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// DecodeJSON tries to decompress the given data. The call to decompress, fails
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// if the content was not compressed in the first place, which is identified by
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// a canary byte before the compressed data. If the data is not compressed, it
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// is JSON decoded directly. Otherwise the decompressed data will be JSON
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// decoded.
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func DecodeJSON(data []byte, out interface{}) error {
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if data == nil || len(data) == 0 {
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return fmt.Errorf("'data' being decoded is nil")
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}
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if out == nil {
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return fmt.Errorf("output parameter 'out' is nil")
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}
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// Decompress the data if it was compressed in the first place
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decompressedBytes, uncompressed, err := compressutil.Decompress(data)
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if err != nil {
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return fmt.Errorf("failed to decompress JSON: err: %v", err)
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}
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if !uncompressed && (decompressedBytes == nil || len(decompressedBytes) == 0) {
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return fmt.Errorf("decompressed data being decoded is invalid")
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}
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// If the input supplied failed to contain the compression canary, it
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// will be notified by the compression utility. Decode the decompressed
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// input.
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if !uncompressed {
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data = decompressedBytes
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}
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return DecodeJSONFromReader(bytes.NewReader(data), out)
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}
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// Decodes/Unmarshals the given io.Reader pointing to a JSON, into a desired object
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func DecodeJSONFromReader(r io.Reader, out interface{}) error {
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if r == nil {
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return fmt.Errorf("'io.Reader' being decoded is nil")
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}
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if out == nil {
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return fmt.Errorf("output parameter 'out' is nil")
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}
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dec := json.NewDecoder(r)
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// While decoding JSON values, intepret the integer values as `json.Number`s instead of `float64`.
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dec.UseNumber()
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// Since 'out' is an interface representing a pointer, pass it to the decoder without an '&'
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return dec.Decode(out)
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}
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