super-graph/core/cursor.go

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package core
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import (
"bytes"
"encoding/base64"
"github.com/dosco/super-graph/core/internal/crypto"
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"github.com/dosco/super-graph/jsn"
"github.com/dosco/super-graph/core/internal/qcode"
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)
func (sg *SuperGraph) encryptCursor(qc *qcode.QCode, data []byte) ([]byte, error) {
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var keys [][]byte
for _, s := range qc.Selects {
if s.Paging.Type != qcode.PtOffset {
var buf bytes.Buffer
buf.WriteString(s.FieldName)
buf.WriteString("_cursor")
keys = append(keys, buf.Bytes())
}
}
if len(keys) == 0 {
return data, nil
}
from := jsn.Get(data, keys)
to := make([]jsn.Field, len(from))
for i, f := range from {
to[i].Key = f.Key
if f.Value[0] != '"' || f.Value[len(f.Value)-1] != '"' {
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continue
}
var buf bytes.Buffer
if len(f.Value) > 2 {
v, err := crypto.Encrypt(f.Value[1:len(f.Value)-1], &sg.encKey)
if err != nil {
return nil, err
}
buf.WriteByte('"')
buf.WriteString(base64.StdEncoding.EncodeToString(v))
buf.WriteByte('"')
} else {
buf.WriteString(`null`)
}
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to[i].Value = buf.Bytes()
}
var buf bytes.Buffer
if err := jsn.Replace(&buf, data, from, to); err != nil {
return nil, err
}
return buf.Bytes(), nil
}
func (sg *SuperGraph) decrypt(data string) ([]byte, error) {
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v, err := base64.StdEncoding.DecodeString(data)
if err != nil {
return nil, err
}
return crypto.Decrypt(v, &sg.encKey)
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}