feat(feishu): enhance channel with markdown cards, media, mentions, and editing

pkg/channels/feishu/common.go

@@ -1,9 +1,92 @@
 package feishu
 
+import (
+	"encoding/json"
+	"regexp"
+	"strings"
+
+	larkim "github.com/larksuite/oapi-sdk-go/v3/service/im/v1"
+)
+
 // stringValue safely dereferences a *string pointer.
 func stringValue(v *string) string {
 	if v == nil {
 		return ""
 	}
 	return *v
 }
+
+// buildMarkdownCard builds a Feishu Interactive Card JSON 2.0 string with markdown content.
+// JSON 2.0 cards support full CommonMark standard markdown syntax.
+func buildMarkdownCard(content string) (string, error) {
+	card := map[string]any{
+		"schema": "2.0",
+		"body": map[string]any{
+			"elements": []map[string]any{
+				{
+					"tag":     "markdown",
+					"content": content,
+				},
+			},
+		},
+	}
+	data, err := json.Marshal(card)
+	if err != nil {
+		return "", err
+	}
+	return string(data), nil
+}
+
+// extractImageKey extracts the image_key from a Feishu image message content JSON.
+// Format: {"image_key": "img_xxx"}
+func extractImageKey(content string) string {
+	var payload struct {
+		ImageKey string `json:"image_key"`
+	}
+	if err := json.Unmarshal([]byte(content), &payload); err != nil {
+		return ""
+	}
+	return payload.ImageKey
+}
+
+// extractFileKey extracts the file_key from a Feishu file/audio message content JSON.
+// Format: {"file_key": "file_xxx", "file_name": "...", ...}
+func extractFileKey(content string) string {
+	var payload struct {
+		FileKey string `json:"file_key"`
+	}
+	if err := json.Unmarshal([]byte(content), &payload); err != nil {
+		return ""
+	}
+	return payload.FileKey
+}
+
+// extractFileName extracts the file_name from a Feishu file message content JSON.
+func extractFileName(content string) string {
+	var payload struct {
+		FileName string `json:"file_name"`
+	}
+	if err := json.Unmarshal([]byte(content), &payload); err != nil {
+		return ""
+	}
+	return payload.FileName
+}
+
+// mentionPlaceholderRegex matches @_user_N placeholders inserted by Feishu for mentions.
+var mentionPlaceholderRegex = regexp.MustCompile(`@_user_\d+`)
+
+// stripMentionPlaceholders removes @_user_N placeholders from the text content.
+// These are inserted by Feishu when users @mention someone in a message.
+func stripMentionPlaceholders(content string, mentions []*larkim.MentionEvent) string {
+	if len(mentions) == 0 {
+		return content
+	}
+	for _, m := range mentions {
+		if m.Key != nil && *m.Key != "" {
+			content = strings.ReplaceAll(content, *m.Key, "")
+		}
+	}
+	// Also clean up any remaining @_user_N patterns
+	content = mentionPlaceholderRegex.ReplaceAllString(content, "")
+	return strings.TrimSpace(content)
+}

pkg/channels/feishu/feishu_32.go

@@ -16,6 +16,8 @@ type FeishuChannel struct {
 	*channels.BaseChannel
 }
 
+var errUnsupported = errors.New("feishu channel is not supported on 32-bit architectures")
+
 // NewFeishuChannel returns an error on 32-bit architectures where the Feishu SDK is not supported
 func NewFeishuChannel(cfg config.FeishuConfig, bus *bus.MessageBus) (*FeishuChannel, error) {
 	return nil, errors.New(
@@ -25,15 +27,35 @@ func NewFeishuChannel(cfg config.FeishuConfig, bus *bus.MessageBus) (*FeishuChan
 
 // Start is a stub method to satisfy the Channel interface
 func (c *FeishuChannel) Start(ctx context.Context) error {
-	return nil
+	return errUnsupported
 }
 
 // Stop is a stub method to satisfy the Channel interface
 func (c *FeishuChannel) Stop(ctx context.Context) error {
-	return nil
+	return errUnsupported
 }
 
 // Send is a stub method to satisfy the Channel interface
 func (c *FeishuChannel) Send(ctx context.Context, msg bus.OutboundMessage) error {
-	return errors.New("feishu channel is not supported on 32-bit architectures")
+	return errUnsupported
+}
+
+// EditMessage is a stub method to satisfy MessageEditor
+func (c *FeishuChannel) EditMessage(ctx context.Context, chatID, messageID, content string) error {
+	return errUnsupported
+}
+
+// SendPlaceholder is a stub method to satisfy PlaceholderCapable
+func (c *FeishuChannel) SendPlaceholder(ctx context.Context, chatID string) (string, error) {
+	return "", errUnsupported
+}
+
+// ReactToMessage is a stub method to satisfy ReactionCapable
+func (c *FeishuChannel) ReactToMessage(ctx context.Context, chatID, messageID string) (func(), error) {
+	return func() {}, errUnsupported
+}
+
+// SendMedia is a stub method to satisfy MediaSender
+func (c *FeishuChannel) SendMedia(ctx context.Context, msg bus.OutboundMediaMessage) error {
+	return errUnsupported
 }