142 lines
3.5 KiB
Go
142 lines
3.5 KiB
Go
package slack
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import (
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"bytes"
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"context"
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"encoding/json"
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"fmt"
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"io"
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"net/http"
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"net/url"
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"time"
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"github.com/nicholas-fedor/shoutrrr/pkg/format"
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"github.com/nicholas-fedor/shoutrrr/pkg/services/standard"
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"github.com/nicholas-fedor/shoutrrr/pkg/types"
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"github.com/nicholas-fedor/shoutrrr/pkg/util/jsonclient"
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)
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// apiPostMessage is the Slack API endpoint for sending messages.
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const (
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apiPostMessage = "https://slack.com/api/chat.postMessage"
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defaultHTTPTimeout = 10 * time.Second // defaultHTTPTimeout is the default timeout for HTTP requests.
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)
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// Service sends notifications to a pre-configured Slack channel or user.
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type Service struct {
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standard.Standard
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Config *Config
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pkr format.PropKeyResolver
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client *http.Client
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}
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// Send delivers a notification message to Slack.
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func (service *Service) Send(message string, params *types.Params) error {
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config := service.Config
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if err := service.pkr.UpdateConfigFromParams(config, params); err != nil {
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return fmt.Errorf("updating config from params: %w", err)
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}
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payload := CreateJSONPayload(config, message)
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var err error
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if config.Token.IsAPIToken() {
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err = service.sendAPI(config, payload)
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} else {
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err = service.sendWebhook(config, payload)
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}
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if err != nil {
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return fmt.Errorf("failed to send slack notification: %w", err)
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}
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return nil
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}
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// Initialize configures the service with a URL and logger.
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func (service *Service) Initialize(configURL *url.URL, logger types.StdLogger) error {
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service.SetLogger(logger)
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service.Config = &Config{}
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service.pkr = format.NewPropKeyResolver(service.Config)
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service.client = &http.Client{
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Timeout: defaultHTTPTimeout,
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}
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return service.Config.setURL(&service.pkr, configURL)
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}
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// GetID returns the service identifier.
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func (service *Service) GetID() string {
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return Scheme
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}
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// sendAPI sends a notification using the Slack API.
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func (service *Service) sendAPI(config *Config, payload any) error {
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response := APIResponse{}
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jsonClient := jsonclient.NewClient()
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jsonClient.Headers().Set("Authorization", config.Token.Authorization())
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if err := jsonClient.Post(apiPostMessage, payload, &response); err != nil {
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return fmt.Errorf("posting to Slack API: %w", err)
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}
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if !response.Ok {
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if response.Error != "" {
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return fmt.Errorf("%w: %v", ErrAPIResponseFailure, response.Error)
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}
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return ErrUnknownAPIError
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}
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if response.Warning != "" {
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service.Logf("Slack API warning: %q", response.Warning)
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}
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return nil
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}
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// sendWebhook sends a notification using a Slack webhook.
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func (service *Service) sendWebhook(config *Config, payload any) error {
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payloadBytes, err := json.Marshal(payload)
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if err != nil {
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return fmt.Errorf("failed to marshal payload: %w", err)
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}
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ctx, cancel := context.WithTimeout(context.Background(), defaultHTTPTimeout)
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defer cancel()
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req, err := http.NewRequestWithContext(
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ctx,
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http.MethodPost,
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config.Token.WebhookURL(),
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bytes.NewBuffer(payloadBytes),
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)
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if err != nil {
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return fmt.Errorf("failed to create webhook request: %w", err)
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}
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req.Header.Set("Content-Type", jsonclient.ContentType)
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res, err := service.client.Do(req)
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if err != nil {
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return fmt.Errorf("failed to invoke webhook: %w", err)
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}
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defer res.Body.Close()
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resBytes, _ := io.ReadAll(res.Body)
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response := string(resBytes)
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switch response {
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case "":
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if res.StatusCode != http.StatusOK {
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return fmt.Errorf("%w: %v", ErrWebhookStatusFailure, res.Status)
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}
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fallthrough
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case "ok":
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return nil
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default:
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return fmt.Errorf("%w: %v", ErrWebhookResponseFailure, response)
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}
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}
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