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client.go
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client.go
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package lpastore
import (
"context"
"errors"
"fmt"
"net/http"
"time"
"github.com/golang-jwt/jwt/v5"
"github.com/ministryofjustice/opg-modernising-lpa/internal/actor/actoruid"
"github.com/ministryofjustice/opg-modernising-lpa/internal/secrets"
)
const (
issuer = "opg.poas.makeregister"
statusActive = "active"
statusReplacement = "replacement"
)
var ErrNotFound = errors.New("lpa not found in lpa-store")
type responseError struct {
name string
body any
}
func (e responseError) Error() string { return e.name }
func (e responseError) Title() string { return e.name }
func (e responseError) Data() any { return e.body }
type Doer interface {
Do(*http.Request) (*http.Response, error)
}
type SecretsClient interface {
Secret(ctx context.Context, name string) (string, error)
}
type Client struct {
baseURL string
secretsClient SecretsClient
doer Doer
now func() time.Time
}
func New(baseURL string, secretsClient SecretsClient, lambdaClient Doer) *Client {
return &Client{baseURL: baseURL, secretsClient: secretsClient, doer: lambdaClient, now: time.Now}
}
func (c *Client) do(ctx context.Context, actorUID actoruid.UID, req *http.Request) (*http.Response, error) {
if req.Body != nil {
req.Header.Set("Content-Type", "application/json")
}
token := jwt.NewWithClaims(jwt.SigningMethodHS256, jwt.RegisteredClaims{
Issuer: issuer,
IssuedAt: jwt.NewNumericDate(c.now()),
Subject: actorUID.PrefixedString(),
})
secretKey, err := c.secretsClient.Secret(ctx, secrets.LpaStoreJwtSecretKey)
if err != nil {
return nil, err
}
auth, err := token.SignedString([]byte(secretKey))
if err != nil {
return nil, err
}
req.Header.Add("X-Jwt-Authorization", "Bearer "+auth)
return c.doer.Do(req)
}
func (c *Client) CheckHealth(ctx context.Context) error {
req, err := http.NewRequestWithContext(ctx, http.MethodGet, c.baseURL+"/health-check", nil)
if err != nil {
return err
}
resp, err := c.doer.Do(req)
if err != nil {
return err
}
if err := resp.Body.Close(); err != nil {
return err
}
if resp.StatusCode != http.StatusOK {
return responseError{name: fmt.Sprintf("expected 200 response but got %d", resp.StatusCode)}
}
return nil
}