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client.go
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client.go
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package notify
import (
"bytes"
"context"
"encoding/json"
"errors"
"net/http"
"strings"
"time"
"github.com/golang-jwt/jwt/v5"
"github.com/ministryofjustice/opg-modernising-lpa/internal/event"
)
type Doer interface {
Do(*http.Request) (*http.Response, error)
}
type EventClient interface {
SendNotificationSent(ctx context.Context, event event.NotificationSent) error
}
type Client struct {
baseURL string
doer Doer
issuer string
secretKey []byte
now func() time.Time
isProduction bool
eventClient EventClient
}
func New(isProduction bool, baseURL, apiKey string, httpClient Doer, eventClient EventClient) (*Client, error) {
keyParts := strings.Split(apiKey, "-")
if len(keyParts) != 11 {
return nil, errors.New("invalid apiKey format")
}
return &Client{
baseURL: baseURL,
doer: httpClient,
issuer: strings.Join(keyParts[1:6], "-"),
secretKey: []byte(strings.Join(keyParts[6:11], "-")),
now: time.Now,
isProduction: isProduction,
eventClient: eventClient,
}, nil
}
type Sms struct {
PhoneNumber string `json:"phone_number"`
TemplateID string `json:"template_id"`
Personalisation map[string]string `json:"personalisation,omitempty"`
Reference string `json:"reference,omitempty"`
}
type response struct {
ID string `json:"id"`
StatusCode int `json:"status_code,omitempty"`
Errors errorsList `json:"errors,omitempty"`
}
type errorsList []errorItem
func (es errorsList) Error() string {
s := "error sending message"
for _, e := range es {
s += ": " + e.Message
}
return s
}
type errorItem struct {
Error string `json:"error"`
Message string `json:"message"`
}
type emailWrapper struct {
EmailAddress string `json:"email_address"`
TemplateID string `json:"template_id"`
Personalisation any `json:"personalisation,omitempty"`
}
func (c *Client) SendEmail(ctx context.Context, to string, email Email) error {
req, err := c.newRequest(ctx, "/v2/notifications/email", emailWrapper{
EmailAddress: to,
TemplateID: email.emailID(c.isProduction),
Personalisation: email,
})
if err != nil {
return err
}
_, err = c.do(req)
if err != nil {
return err
}
return nil
}
func (c *Client) SendActorEmail(ctx context.Context, to, lpaUID string, email Email) error {
req, err := c.newRequest(ctx, "/v2/notifications/email", emailWrapper{
EmailAddress: to,
TemplateID: email.emailID(c.isProduction),
Personalisation: email,
})
if err != nil {
return err
}
resp, err := c.do(req)
if err != nil {
return err
}
if err := c.eventClient.SendNotificationSent(ctx, event.NotificationSent{
UID: lpaUID,
NotificationID: resp.ID,
}); err != nil {
return err
}
return nil
}
type smsWrapper struct {
PhoneNumber string `json:"phone_number"`
TemplateID string `json:"template_id"`
Personalisation any `json:"personalisation,omitempty"`
}
func (c *Client) SendActorSMS(ctx context.Context, to, lpaUID string, sms SMS) error {
req, err := c.newRequest(ctx, "/v2/notifications/sms", smsWrapper{
PhoneNumber: to,
TemplateID: sms.smsID(c.isProduction),
Personalisation: sms,
})
if err != nil {
return err
}
resp, err := c.do(req)
if err != nil {
return err
}
if err := c.eventClient.SendNotificationSent(ctx, event.NotificationSent{
UID: lpaUID,
NotificationID: resp.ID,
}); err != nil {
return err
}
return nil
}
func (c *Client) newRequest(ctx context.Context, url string, wrapper any) (*http.Request, error) {
var buf bytes.Buffer
if err := json.NewEncoder(&buf).Encode(wrapper); err != nil {
return nil, err
}
token, err := jwt.NewWithClaims(jwt.SigningMethodHS256, &jwt.RegisteredClaims{
Issuer: c.issuer,
IssuedAt: jwt.NewNumericDate(c.now()),
}).SignedString(c.secretKey)
if err != nil {
return nil, err
}
req, err := http.NewRequestWithContext(ctx, http.MethodPost, c.baseURL+url, &buf)
if err != nil {
return nil, err
}
req.Header.Add("Content-Type", "application/json")
req.Header.Add("Authorization", "Bearer "+token)
return req, nil
}
func (c *Client) do(req *http.Request) (response, error) {
var r response
resp, err := c.doer.Do(req)
if err != nil {
return r, err
}
defer resp.Body.Close()
if err := json.NewDecoder(resp.Body).Decode(&r); err != nil {
return r, err
}
if len(r.Errors) > 0 {
return r, r.Errors
}
return r, nil
}