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package mattermost
import (
"bytes"
"context"
"crypto/tls"
"errors"
"fmt"
"net/http"
"net/url"
"time"
"github.com/nicholas-fedor/shoutrrr/pkg/format"
"github.com/nicholas-fedor/shoutrrr/pkg/services/standard"
"github.com/nicholas-fedor/shoutrrr/pkg/types"
)
// defaultHTTPTimeout is the default timeout for HTTP requests.
const defaultHTTPTimeout = 10 * time.Second
// ErrSendFailed indicates that the notification failed due to an unexpected response status code.
var ErrSendFailed = errors.New(
"failed to send notification to service, response status code unexpected",
)
// Service sends notifications to a pre-configured Mattermost channel or user.
type Service struct {
standard.Standard
Config *Config
pkr format.PropKeyResolver
httpClient *http.Client
}
// GetHTTPClient returns the service's HTTP client for testing purposes.
func (service *Service) GetHTTPClient() *http.Client {
return service.httpClient
}
// Initialize configures the service with a URL and logger.
func (service *Service) Initialize(configURL *url.URL, logger types.StdLogger) error {
service.SetLogger(logger)
service.Config = &Config{}
service.pkr = format.NewPropKeyResolver(service.Config)
err := service.Config.setURL(&service.pkr, configURL)
if err != nil {
return err
}
var transport *http.Transport
if service.Config.DisableTLS {
transport = &http.Transport{
TLSClientConfig: nil, // Plain HTTP
}
} else {
transport = &http.Transport{
TLSClientConfig: &tls.Config{
InsecureSkipVerify: false, // Explicitly safe when TLS is enabled
MinVersion: tls.VersionTLS12, // Enforce TLS 1.2 or higher
},
}
}
service.httpClient = &http.Client{Transport: transport}
return nil
}
// GetID returns the service identifier.
func (service *Service) GetID() string {
return Scheme
}
// Send delivers a notification message to Mattermost.
func (service *Service) Send(message string, params *types.Params) error {
config := service.Config
apiURL := buildURL(config)
if err := service.pkr.UpdateConfigFromParams(config, params); err != nil {
return fmt.Errorf("updating config from params: %w", err)
}
json, _ := CreateJSONPayload(config, message, params)
ctx, cancel := context.WithTimeout(context.Background(), defaultHTTPTimeout)
defer cancel()
req, err := http.NewRequestWithContext(ctx, http.MethodPost, apiURL, bytes.NewReader(json))
if err != nil {
return fmt.Errorf("creating POST request: %w", err)
}
req.Header.Set("Content-Type", "application/json")
res, err := service.httpClient.Do(req)
if err != nil {
return fmt.Errorf("executing POST request to Mattermost API: %w", err)
}
defer res.Body.Close()
if res.StatusCode != http.StatusOK {
return fmt.Errorf("%w: %s", ErrSendFailed, res.Status)
}
return nil
}
// buildURL constructs the API URL for Mattermost based on the Config.
func buildURL(config *Config) string {
scheme := "https"
if config.DisableTLS {
scheme = "http"
}
return fmt.Sprintf("%s://%s/hooks/%s", scheme, config.Host, config.Token)
}
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