Adding upstream version 0.8.9.

Signed-off-by: Daniel Baumann <daniel@debian.org>

pkg/services/mattermost/mattermost.go

@@ -0,0 +1,116 @@
+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)
+}