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package services
import (
"bytes"
"context"
"encoding/json"
"fmt"
"io"
"net/http"
"strings"
"sync"
"time"
"github.com/avast/retry-go"
"github.com/pkg/errors"
"github.com/gofiber/fiber/v2"
"github.com/NdoleStudio/httpsms/pkg/events"
"github.com/NdoleStudio/httpsms/pkg/entities"
"github.com/NdoleStudio/httpsms/pkg/repositories"
"github.com/NdoleStudio/httpsms/pkg/telemetry"
cloudevents "github.com/cloudevents/sdk-go/v2"
"github.com/golang-jwt/jwt/v5"
"github.com/google/uuid"
"github.com/lib/pq"
"github.com/palantir/stacktrace"
)
// WebhookService is responsible for handling webhooks
type WebhookService struct {
service
logger telemetry.Logger
tracer telemetry.Tracer
client *http.Client
repository repositories.WebhookRepository
dispatcher *EventDispatcher
}
// NewWebhookService creates a new WebhookService
func NewWebhookService(
logger telemetry.Logger,
tracer telemetry.Tracer,
client *http.Client,
repository repositories.WebhookRepository,
dispatcher *EventDispatcher,
) (s *WebhookService) {
return &WebhookService{
logger: logger.WithService(fmt.Sprintf("%T", s)),
tracer: tracer,
client: client,
dispatcher: dispatcher,
repository: repository,
}
}
// DeleteAllForUser deletes all entities.Webhook for an entities.UserID.
func (service *WebhookService) DeleteAllForUser(ctx context.Context, userID entities.UserID) error {
ctx, span, ctxLogger := service.tracer.StartWithLogger(ctx, service.logger)
defer span.End()
if err := service.repository.DeleteAllForUser(ctx, userID); err != nil {
msg := fmt.Sprintf("could not delete all [entities.Webhook] for user with ID [%s]", userID)
return service.tracer.WrapErrorSpan(span, stacktrace.Propagate(err, msg))
}
ctxLogger.Info(fmt.Sprintf("deleted all [entities.Webhook] for user with ID [%s]", userID))
return nil
}
// Index fetches the entities.Webhook for an entities.UserID
func (service *WebhookService) Index(ctx context.Context, userID entities.UserID, params repositories.IndexParams) ([]*entities.Webhook, error) {
ctx, span := service.tracer.Start(ctx)
defer span.End()
ctxLogger := service.tracer.CtxLogger(service.logger, span)
webhooks, err := service.repository.Index(ctx, userID, params)
if err != nil {
msg := fmt.Sprintf("could not fetch webhooks with params [%+#v]", params)
return nil, service.tracer.WrapErrorSpan(span, stacktrace.Propagate(err, msg))
}
ctxLogger.Info(fmt.Sprintf("fetched [%d] webhooks with prams [%+#v]", len(webhooks), params))
return webhooks, nil
}
// Delete an entities.Webhook
func (service *WebhookService) Delete(ctx context.Context, userID entities.UserID, webhookID uuid.UUID) error {
ctx, span := service.tracer.Start(ctx)
defer span.End()
ctxLogger := service.tracer.CtxLogger(service.logger, span)
if _, err := service.repository.Load(ctx, userID, webhookID); err != nil {
msg := fmt.Sprintf("cannot load webhook with userID [%s] and phoneID [%s]", userID, webhookID)
return service.tracer.WrapErrorSpan(span, stacktrace.PropagateWithCode(err, stacktrace.GetCode(err), msg))
}
if err := service.repository.Delete(ctx, userID, webhookID); err != nil {
msg := fmt.Sprintf("cannot delete webhook with id [%s] and user id [%s]", webhookID, userID)
return service.tracer.WrapErrorSpan(span, stacktrace.Propagate(err, msg))
}
ctxLogger.Info(fmt.Sprintf("deleted webhook with id [%s] and user id [%s]", webhookID, userID))
return nil
}
// WebhookStoreParams are parameters for creating a new entities.Webhook
type WebhookStoreParams struct {
UserID entities.UserID
SigningKey string
URL string
PhoneNumbers pq.StringArray
Events pq.StringArray
}
// Store a new entities.Webhook
func (service *WebhookService) Store(ctx context.Context, params *WebhookStoreParams) (*entities.Webhook, error) {
ctx, span := service.tracer.Start(ctx)
defer span.End()
ctxLogger := service.tracer.CtxLogger(service.logger, span)
webhook := &entities.Webhook{
ID: uuid.New(),
UserID: params.UserID,
URL: params.URL,
PhoneNumbers: params.PhoneNumbers,
SigningKey: params.SigningKey,
Events: params.Events,
CreatedAt: time.Now().UTC(),
UpdatedAt: time.Now().UTC(),
}
if err := service.repository.Save(ctx, webhook); err != nil {
msg := fmt.Sprintf("cannot save webhook with id [%s]", webhook.ID)
return nil, service.tracer.WrapErrorSpan(span, stacktrace.Propagate(err, msg))
}
ctxLogger.Info(fmt.Sprintf("webhook saved with id [%s] for user [%s] in the [%T]", webhook.ID, webhook.UserID, service.repository))
return webhook, nil
}
// WebhookUpdateParams are parameters for updating an entities.Webhook
type WebhookUpdateParams struct {
UserID entities.UserID
SigningKey string
URL string
Events pq.StringArray
PhoneNumbers pq.StringArray
WebhookID uuid.UUID
}
// Update an entities.Webhook
func (service *WebhookService) Update(ctx context.Context, params *WebhookUpdateParams) (*entities.Webhook, error) {
ctx, span, ctxLogger := service.tracer.StartWithLogger(ctx, service.logger)
defer span.End()
webhook, err := service.repository.Load(ctx, params.UserID, params.WebhookID)
if err != nil {
msg := fmt.Sprintf("cannot load webhook with userID [%s] and phoneID [%s]", params.UserID, params.WebhookID)
return nil, service.tracer.WrapErrorSpan(span, stacktrace.PropagateWithCode(err, stacktrace.GetCode(err), msg))
}
webhook.URL = params.URL
webhook.SigningKey = params.SigningKey
webhook.Events = params.Events
webhook.PhoneNumbers = params.PhoneNumbers
if err = service.repository.Save(ctx, webhook); err != nil {
msg := fmt.Sprintf("cannot save webhook with id [%s] after update", webhook.ID)
return nil, service.tracer.WrapErrorSpan(span, stacktrace.Propagate(err, msg))
}
ctxLogger.Info(fmt.Sprintf("webhook updated with id [%s] in the [%T]", webhook.ID, service.repository))
return webhook, nil
}
// Send an event to a subscribed webhook
func (service *WebhookService) Send(ctx context.Context, userID entities.UserID, event cloudevents.Event, phoneNumber string) error {
ctx, span, ctxLogger := service.tracer.StartWithLogger(ctx, service.logger)
defer span.End()
webhooks, err := service.repository.LoadByEvent(ctx, userID, event.Type(), phoneNumber)
if err != nil {
msg := fmt.Sprintf("cannot load webhooks for userID [%s] and event [%s]", userID, event.Type())
return service.tracer.WrapErrorSpan(span, stacktrace.PropagateWithCode(err, stacktrace.GetCode(err), msg))
}
if len(webhooks) == 0 {
ctxLogger.Info(fmt.Sprintf("user [%s] has no webhook subscription to event [%s]", userID, event.Type()))
return nil
}
var wg sync.WaitGroup
for _, webhook := range webhooks {
wg.Add(1)
go func(webhook *entities.Webhook) {
defer wg.Done()
service.sendNotification(ctx, event, phoneNumber, webhook)
}(webhook)
}
wg.Wait()
return nil
}
func (service *WebhookService) sendNotification(ctx context.Context, event cloudevents.Event, owner string, webhook *entities.Webhook) {
ctx, span, ctxLogger := service.tracer.StartWithLogger(ctx, service.logger)
defer span.End()
attempts := 0
err := retry.Do(func() error {
attempts++
requestCtx, cancel := context.WithTimeout(ctx, 5*time.Second)
defer cancel()
request, err := service.createRequest(requestCtx, event, webhook)
if err != nil {
msg := fmt.Sprintf("cannot create [%s] event to webhook [%s] for user [%s] after [%d] attempts", event.Type(), webhook.URL, webhook.UserID, attempts)
return service.tracer.WrapErrorSpan(span, stacktrace.Propagate(err, msg))
}
response, err := service.client.Do(request)
if err != nil {
ctxLogger.Warn(stacktrace.Propagate(err, fmt.Sprintf("cannot send [%s] event to webhook [%s] for user [%s] after [%d] attempts", event.Type(), webhook.URL, webhook.UserID, attempts)))
if attempts == 1 {
return err
}
service.handleWebhookSendFailed(ctx, event, webhook, owner, err, response)
return nil
}
defer func() {
err = response.Body.Close()
if err != nil {
ctxLogger.Error(stacktrace.Propagate(err, fmt.Sprintf("cannot close response body for [%s] event with ID [%s] after [%d] attempts", event.Type(), event.ID(), attempts)))
}
}()
if response.StatusCode >= 400 {
ctxLogger.Info(fmt.Sprintf("cannot send [%s] event to webhook [%s] for user [%s] with response code [%d] after [%d] attempts", event.Type(), webhook.URL, webhook.UserID, response.StatusCode, attempts))
if attempts == 1 {
return stacktrace.NewError(http.StatusText(response.StatusCode))
}
service.handleWebhookSendFailed(ctx, event, webhook, owner, stacktrace.NewError(http.StatusText(response.StatusCode)), response)
return nil
}
ctxLogger.Info(fmt.Sprintf("sent webhook to url [%s] for event [%s] with ID [%s] and response code [%d]", webhook.URL, event.Type(), event.ID(), response.StatusCode))
return nil
}, retry.Attempts(2))
if err != nil {
msg := fmt.Sprintf("cannot handle [%s] event to webhook [%s] for user [%s] after [%d] attempts", event.Type(), webhook.URL, webhook.UserID, attempts)
ctxLogger.Error(service.tracer.WrapErrorSpan(span, stacktrace.Propagate(err, msg)))
}
}
func (service *WebhookService) createRequest(ctx context.Context, event cloudevents.Event, webhook *entities.Webhook) (*http.Request, error) {
ctx, span, ctxLogger := service.tracer.StartWithLogger(ctx, service.logger)
defer span.End()
payload, err := json.Marshal(service.getPayload(ctxLogger, event, webhook))
if err != nil {
msg := fmt.Sprintf("cannot marshal payload for user [%s] and webhook [%s] for event [%s]", webhook.UserID, webhook.ID, event.ID())
return nil, stacktrace.Propagate(err, msg)
}
request, err := http.NewRequestWithContext(ctx, http.MethodPost, webhook.URL, bytes.NewReader(payload))
if err != nil {
msg := fmt.Sprintf("cannot create request for user [%s] and webhook [%s] for event [%s]", webhook.UserID, webhook.ID, event.ID())
return nil, stacktrace.Propagate(err, msg)
}
request.Header.Add("X-Event-Type", event.Type())
request.Header.Set("Content-Type", "application/json")
if strings.TrimSpace(webhook.SigningKey) != "" {
token, err := service.getAuthToken(webhook)
if err != nil {
msg := fmt.Sprintf("cannot generate auth token for user [%s] and webhook [%s]", webhook.UserID, webhook.ID)
return nil, stacktrace.Propagate(err, msg)
}
request.Header.Add("Authorization", fmt.Sprintf("Bearer %s", token))
}
return request, nil
}
func (service *WebhookService) getPayload(ctxLogger telemetry.Logger, event cloudevents.Event, webhook *entities.Webhook) any {
if event.Type() != events.EventTypeMessagePhoneReceived {
return event
}
if !strings.HasPrefix(webhook.URL, "https://discord.com/api/webhooks/") {
return event
}
payload := new(events.MessagePhoneReceivedPayload)
err := event.DataAs(payload)
if err != nil {
ctxLogger.Error(stacktrace.Propagate(err, fmt.Sprintf("cannot unmarshal event [%s] with ID [%s] into [%T]", event.Type(), event.ID(), payload)))
return event
}
return map[string]any{
"avatar_url": "https://httpsms.com/avatar.png",
"username": "httpsms.com",
"content": "✉ new message received",
"embeds": []fiber.Map{
{
"fields": []fiber.Map{
{
"name": "From:",
"value": service.getFormattedNumber(ctxLogger, payload.Contact),
"inline": true,
},
{
"name": "To:",
"value": service.getFormattedNumber(ctxLogger, payload.Owner),
"inline": true,
},
{
"name": "Content:",
"value": payload.Content,
},
{
"name": "MessageID:",
"value": payload.MessageID,
},
},
},
},
}
}
func (service *WebhookService) getAuthToken(webhook *entities.Webhook) (string, error) {
token := jwt.NewWithClaims(jwt.SigningMethodHS256, jwt.RegisteredClaims{
Audience: []string{webhook.URL},
ExpiresAt: jwt.NewNumericDate(time.Now().UTC().Add(10 * time.Minute)),
IssuedAt: jwt.NewNumericDate(time.Now().UTC()),
Issuer: "api.httpsms.com",
NotBefore: jwt.NewNumericDate(time.Now().UTC().Add(-10 * time.Minute)),
Subject: string(webhook.UserID),
})
return token.SignedString([]byte(webhook.SigningKey))
}
func (service *WebhookService) handleWebhookSendFailed(ctx context.Context, event cloudevents.Event, webhook *entities.Webhook, owner string, err error, response *http.Response) {
ctx, span, ctxLogger := service.tracer.StartWithLogger(ctx, service.logger)
defer span.End()
payload := &events.WebhookSendFailedPayload{
WebhookID: webhook.ID,
WebhookURL: webhook.URL,
UserID: webhook.UserID,
EventID: event.ID(),
Owner: owner,
EventType: event.Type(),
EventPayload: string(event.Data()),
HTTPResponseStatusCode: nil,
ErrorMessage: err.Error(),
}
if errors.Is(err, context.DeadlineExceeded) {
payload.ErrorMessage = "TIMOUT after 10 seconds"
}
if response != nil {
payload.HTTPResponseStatusCode = &response.StatusCode
payload.ErrorMessage = http.StatusText(response.StatusCode)
body, err := io.ReadAll(response.Body)
if err == nil && len(body) > 0 {
payload.ErrorMessage = string(body)
}
}
event, err = service.createEvent(events.EventTypeWebhookSendFailed, event.Source(), payload)
if err != nil {
msg := fmt.Sprintf("cannot create event [%s] for user with id [%s]", events.EventTypeWebhookSendFailed, payload.UserID)
ctxLogger.Error(service.tracer.WrapErrorSpan(span, stacktrace.Propagate(err, msg)))
return
}
if err = service.dispatcher.Dispatch(ctx, event); err != nil {
msg := fmt.Sprintf("cannot dispatch event [%s] for user with id [%s]", event.Type(), payload.UserID)
ctxLogger.Error(service.tracer.WrapErrorSpan(span, stacktrace.Propagate(err, msg)))
return
}
ctxLogger.Info(fmt.Sprintf("dispatched [%s] event with ID [%s] for user with id [%s]", event.Type(), event.ID(), payload.UserID))
}