feat: 完成一般消息通知能力的开发

renderer.go

@@ -0,0 +1,69 @@
+package notice
+
+import (
+	"encoding/json"
+	"fmt"
+	"html"
+	"strings"
+)
+
+type renderedRequest struct {
+	URL  string `json:"url" dc:"最终请求地址"`
+	Body []byte `json:"body" dc:"平台请求体"`
+}
+
+type renderer interface {
+	Capabilities() Capabilities
+	Render(config Config, message Message) (renderedRequest, error)
+	ValidateResponse(response networkResponse) error
+}
+
+func marshalRequest(url string, body any) (renderedRequest, error) {
+	data, err := json.Marshal(body)
+	if err != nil {
+		return renderedRequest{}, fmt.Errorf("notice: marshal webhook request: %w", err)
+	}
+	return renderedRequest{URL: url, Body: data}, nil
+}
+
+func validateHTTP(channel Channel, response networkResponse) error {
+	if response.StatusCode < 200 || response.StatusCode >= 300 {
+		return &HTTPError{Channel: channel, StatusCode: response.StatusCode, Body: string(response.Body)}
+	}
+	return nil
+}
+
+func cardMarkdown(card *CardContent) string {
+	parts := make([]string, 0, 1+len(card.Fields))
+	if strings.TrimSpace(card.Markdown) != "" {
+		parts = append(parts, card.Markdown)
+	}
+	for _, field := range card.Fields {
+		parts = append(parts, fmt.Sprintf("**%s：** %s", field.Name, field.Value))
+	}
+	return strings.Join(parts, "\n\n")
+}
+
+func cardMarkdownFallback(card *CardContent) string {
+	content := cardMarkdown(card)
+	if strings.TrimSpace(content) == "" {
+		return card.Title
+	}
+	if strings.TrimSpace(card.Title) == "" {
+		return content
+	}
+	return "## " + card.Title + "\n\n" + content
+}
+
+func plainTitle(title, fallback string) string {
+	if strings.TrimSpace(title) == "" {
+		return fallback
+	}
+	return title
+}
+
+func escapeText(value string) string {
+	value = html.EscapeString(value)
+	replacer := strings.NewReplacer("\\", "\\\\", "*", "\\*", "_", "\\_", "`", "\\`", "[", "\\[", "]", "\\]")
+	return replacer.Replace(value)
+}