-
Notifications
You must be signed in to change notification settings - Fork 135
/
base64.go
98 lines (79 loc) · 2.24 KB
/
base64.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
// Copyright 2020 VMware, Inc.
// SPDX-License-Identifier: Apache-2.0
package yttlibrary
import (
"encoding/base64"
"fmt"
"carvel.dev/ytt/pkg/template/core"
"github.com/k14s/starlark-go/starlark"
"github.com/k14s/starlark-go/starlarkstruct"
)
var (
Base64API = starlark.StringDict{
"base64": &starlarkstruct.Module{
Name: "base64",
Members: starlark.StringDict{
"encode": starlark.NewBuiltin("base64.encode", core.ErrWrapper(base64Module{}.Encode)),
"decode": starlark.NewBuiltin("base64.decode", core.ErrWrapper(base64Module{}.Decode)),
},
},
}
)
type base64Module struct{}
func (b base64Module) Encode(thread *starlark.Thread, f *starlark.Builtin, args starlark.Tuple, kwargs []starlark.Tuple) (starlark.Value, error) {
if args.Len() != 1 {
return starlark.None, fmt.Errorf("expected exactly one argument")
}
val, err := core.NewStarlarkValue(args.Index(0)).AsString()
if err != nil {
return starlark.None, err
}
encoding, err := b.buildEncoding(kwargs)
if err != nil {
return starlark.None, err
}
return starlark.String(encoding.EncodeToString([]byte(val))), nil
}
func (b base64Module) Decode(thread *starlark.Thread, f *starlark.Builtin, args starlark.Tuple, kwargs []starlark.Tuple) (starlark.Value, error) {
if args.Len() != 1 {
return starlark.None, fmt.Errorf("expected exactly one argument")
}
val, err := core.NewStarlarkValue(args.Index(0)).AsString()
if err != nil {
return starlark.None, err
}
encoding, err := b.buildEncoding(kwargs)
if err != nil {
return starlark.None, err
}
valDecoded, err := encoding.DecodeString(val)
if err != nil {
return starlark.None, err
}
return starlark.String(string(valDecoded)), nil
}
func (b base64Module) buildEncoding(kwargs []starlark.Tuple) (*base64.Encoding, error) {
var encoding *base64.Encoding = base64.StdEncoding
isURL, err := core.BoolArg(kwargs, "url")
if err != nil {
return nil, err
}
if isURL {
encoding = base64.URLEncoding
}
isRaw, err := core.BoolArg(kwargs, "raw")
if err != nil {
return nil, err
}
if isRaw {
encoding = encoding.WithPadding(base64.NoPadding)
}
isStrict, err := core.BoolArg(kwargs, "strict")
if err != nil {
return nil, err
}
if isStrict {
encoding = encoding.Strict()
}
return encoding, nil
}