/
api_op_GetToken.go
111 lines (89 loc) · 2.58 KB
/
api_op_GetToken.go
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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) (interface{}, error) {
defer resp.Body.Close()
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)
}