/
ssm_config.go
65 lines (54 loc) · 1.69 KB
/
ssm_config.go
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package main
import (
"context"
"encoding/json"
"fmt"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/service/ssm"
"github.com/aws/aws-sdk-go/service/ssm/ssmiface"
"github.com/coreos/go-oidc/v3/oidc"
"github.com/pkg/errors"
"regexp"
"strings"
)
type parameterStoreValue struct {
Issuer string `json:"issuer"`
Audience string `json:"audience"`
}
func verifiersFromParameterStore(ctx context.Context, api ssmiface.SSMAPI, prefix string) (map[string]*oidc.IDTokenVerifier, error) {
prefix = strings.TrimSuffix(prefix, "/")
issuersPrefix := prefix + "/issuers/"
issuerNameRegexp := regexp.MustCompile(issuersPrefix + `[^/]+$`)
verifiers := map[string]*oidc.IDTokenVerifier{}
err := api.GetParametersByPathPagesWithContext(ctx, &ssm.GetParametersByPathInput{Path: &prefix, Recursive: aws.Bool(true)}, func(page *ssm.GetParametersByPathOutput, lastPage bool) bool {
for _, parameter := range page.Parameters {
name := *parameter.Name
if !issuerNameRegexp.MatchString(name) {
continue
}
psv := parameterStoreValue{}
err := json.Unmarshal([]byte(*parameter.Value), &psv)
if err != nil {
fmt.Printf("%+v\n", err)
panic(err)
}
provider, err := oidc.NewProvider(ctx, psv.Issuer)
if err != nil {
fmt.Printf("%+v\n", err)
panic(err)
}
verifier := provider.Verifier(&oidc.Config{
ClientID: psv.Audience,
SkipClientIDCheck: psv.Audience == "",
})
issuerId := strings.TrimPrefix(name, issuersPrefix)
verifiers[issuerId] = verifier
fmt.Printf("issuerId=%s url=%s aud=%s\n", issuerId, psv.Issuer, psv.Audience)
}
return !lastPage
})
if err != nil {
return nil, errors.WithStack(err)
}
return verifiers, nil
}