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
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
|
package imds
import (
"context"
"fmt"
"io"
"strconv"
"strings"
"time"
"github.com/aws/smithy-go/middleware"
smithyhttp "github.com/aws/smithy-go/transport/http"
)
const getTokenPath = "/latest/api/token"
const tokenTTLHeader = "X-Aws-Ec2-Metadata-Token-Ttl-Seconds"
// getToken uses the duration to return a token for EC2 IMDS, or an error if
// the request failed.
func (c *Client) getToken(ctx context.Context, params *getTokenInput, optFns ...func(*Options)) (*getTokenOutput, error) {
if params == nil {
params = &getTokenInput{}
}
result, metadata, err := c.invokeOperation(ctx, "getToken", params, optFns,
addGetTokenMiddleware,
)
if err != nil {
return nil, err
}
out := result.(*getTokenOutput)
out.ResultMetadata = metadata
return out, nil
}
type getTokenInput struct {
TokenTTL time.Duration
}
type getTokenOutput struct {
Token string
TokenTTL time.Duration
ResultMetadata middleware.Metadata
}
func addGetTokenMiddleware(stack *middleware.Stack, options Options) error {
err := addRequestMiddleware(stack,
options,
"PUT",
buildGetTokenPath,
buildGetTokenOutput)
if err != nil {
return err
}
err = stack.Serialize.Add(&tokenTTLRequestHeader{}, middleware.After)
if err != nil {
return err
}
return nil
}
func buildGetTokenPath(interface{}) (string, error) {
return getTokenPath, nil
}
func buildGetTokenOutput(resp *smithyhttp.Response) (v interface{}, err error) {
defer func() {
closeErr := resp.Body.Close()
if err == nil {
err = closeErr
} else if closeErr != nil {
err = fmt.Errorf("response body close error: %v, original error: %w", closeErr, err)
}
}()
ttlHeader := resp.Header.Get(tokenTTLHeader)
tokenTTL, err := strconv.ParseInt(ttlHeader, 10, 64)
if err != nil {
return nil, fmt.Errorf("unable to parse API token, %w", err)
}
var token strings.Builder
if _, err = io.Copy(&token, resp.Body); err != nil {
return nil, fmt.Errorf("unable to read API token, %w", err)
}
return &getTokenOutput{
Token: token.String(),
TokenTTL: time.Duration(tokenTTL) * time.Second,
}, nil
}
type tokenTTLRequestHeader struct{}
func (*tokenTTLRequestHeader) ID() string { return "tokenTTLRequestHeader" }
func (*tokenTTLRequestHeader) HandleSerialize(
ctx context.Context, in middleware.SerializeInput, next middleware.SerializeHandler,
) (
out middleware.SerializeOutput, metadata middleware.Metadata, err error,
) {
req, ok := in.Request.(*smithyhttp.Request)
if !ok {
return out, metadata, fmt.Errorf("expect HTTP transport, got %T", in.Request)
}
input, ok := in.Parameters.(*getTokenInput)
if !ok {
return out, metadata, fmt.Errorf("expect getTokenInput, got %T", in.Parameters)
}
req.Header.Set(tokenTTLHeader, strconv.Itoa(int(input.TokenTTL/time.Second)))
return next.HandleSerialize(ctx, in)
}
|
