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cognito.go
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cognito.go
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package cognito
import (
"context"
"crypto/rsa"
"fmt"
"github.com/aws/aws-sdk-go-v2/aws"
"github.com/aws/aws-sdk-go-v2/service/cognitoidentityprovider"
"github.com/aws/aws-sdk-go-v2/service/cognitoidentityprovider/types"
"github.com/golang-jwt/jwt/v5"
"github.com/infani/awsgo/config/awsConfig"
"github.com/lestrrat-go/jwx/jwk"
)
type Client struct {
clientId string
set jwk.Set
}
func New(region string, userPoolID string, clientId string) (*Client, error) {
jwksURL := fmt.Sprintf("https://cognito-idp.%s.amazonaws.com/%s/.well-known/jwks.json", region, userPoolID)
set, err := jwk.Fetch(context.Background(), jwksURL)
if err != nil {
return nil, err
}
return &Client{
clientId: clientId,
set: set,
}, nil
}
func (cli *Client) InitiateAuth(username string, password string) (accessToken string, err error) {
cfg, err := awsConfig.LoadAWSDefaultConfig()
if err != nil {
panic("configuration error, " + err.Error())
}
client := cognitoidentityprovider.NewFromConfig(cfg)
input := &cognitoidentityprovider.InitiateAuthInput{
AuthFlow: types.AuthFlowTypeUserPasswordAuth,
ClientId: aws.String(cli.clientId),
AuthParameters: map[string]string{
"USERNAME": username,
"PASSWORD": password,
},
}
ctx := context.Background()
output, err := client.InitiateAuth(ctx, input)
if err != nil {
return "", err
}
return *output.AuthenticationResult.AccessToken, nil
}
func (cli *Client) DecodeJWT(tokenString string) (sub string, err error) {
token, err := jwt.Parse(tokenString, func(token *jwt.Token) (interface{}, error) {
alg, ok := token.Header["alg"].(string)
if !ok {
return nil, fmt.Errorf("alg header not found")
}
if alg != "RS256" {
return nil, fmt.Errorf("unexpected alg: %v", alg)
}
kid, ok := token.Header["kid"].(string)
if !ok {
return nil, fmt.Errorf("kid header not found")
}
key, ok := cli.set.LookupKeyID(kid)
if !ok {
return nil, fmt.Errorf("key %v not found", kid)
}
var rsaPublicKey rsa.PublicKey
if err := key.Raw(&rsaPublicKey); err != nil {
return nil, fmt.Errorf("failed to create public key: %v", err)
}
return &rsaPublicKey, nil
})
if err != nil {
return
}
if claims, ok := token.Claims.(jwt.MapClaims); ok {
sub = claims["sub"].(string)
} else {
err = fmt.Errorf("claims not found")
}
return
}