refactor: js plugin api

parsers/native/kemono/kemono.go

@@ -0,0 +1,173 @@
+package kemono
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"net/http"
+	"net/url"
+	"path"
+	"strings"
+
+	"github.com/duke-git/lancet/v2/strutil"
+	"github.com/krau/SaveAny-Bot/common/utils/netutil"
+	"github.com/krau/SaveAny-Bot/pkg/parser"
+)
+
+type KemonoParser struct{}
+
+var (
+	kemonoDomains = []string{
+		"kemono.su",
+		"kemono.cr",
+	}
+	ErrFailedToExtractInfo = errors.New("failed to extract download info from URL")
+)
+
+const (
+	kemonoApiBase = "https://kemono.cr/api/v1"
+)
+
+func (k *KemonoParser) CanHandle(text string) bool {
+	text = strings.TrimPrefix(text, "https://")
+	text = strings.TrimPrefix(text, "http://")
+
+	var matchesDomain bool
+	for _, domain := range kemonoDomains {
+		if strings.Contains(text, domain) {
+			matchesDomain = true
+			break
+		}
+	}
+	if !matchesDomain {
+		return false
+	}
+
+	var path string
+	for _, domain := range kemonoDomains {
+		if idx := strings.Index(text, domain); idx != -1 {
+			remaining := text[idx+len(domain):]
+			if len(remaining) > 0 && remaining[0] == '/' {
+				path = remaining[1:]
+			}
+			break
+		}
+	}
+
+	if path == "" {
+		return false
+	}
+
+	parts := strings.Split(path, "/")
+	// servicename/user/id (user profile page)
+	// servicename/user/id/post/id (post page)
+	return len(parts) == 3 || (len(parts) == 5 && parts[3] == "post")
+}
+
+func (k *KemonoParser) Parse(ctx context.Context, u string) (*parser.Item, error) {
+	info := extractDownloadInfoFromURL(u)
+	if info == nil {
+		return nil, ErrFailedToExtractInfo
+	}
+	if info.PostID != "" {
+		return k.parseOne(ctx, info)
+	}
+	return k.parseUserPage(ctx, info)
+}
+
+func (k *KemonoParser) parseOne(ctx context.Context, info *DownloadInfo) (*parser.Item, error) {
+	client := netutil.DefaultParserHTTPClient()
+	endpoint := fmt.Sprintf("%s/%s/user/%s/post/%s", kemonoApiBase, info.ServiceName, info.UserID, info.PostID)
+	req, err := http.NewRequestWithContext(ctx, http.MethodGet, endpoint, nil)
+	if err != nil {
+		return nil, fmt.Errorf("failed to create request to Kemono API: %w", err)
+	}
+	req.Header.Set("Accept", "text/css")
+	resp, err := client.Do(req)
+	if err != nil {
+		return nil, fmt.Errorf("failed to fetch Kemono API: %w", err)
+	}
+	defer resp.Body.Close()
+	if resp.StatusCode != http.StatusOK {
+		return nil, fmt.Errorf("failed to fetch Kemono API, status code: %d", resp.StatusCode)
+	}
+	var postInfo PostInfo
+	if err := json.NewDecoder(resp.Body).Decode(&postInfo); err != nil {
+		return nil, fmt.Errorf("failed to decode Kemono API response: %w", err)
+	}
+	item := &parser.Item{
+		Site:        "kemono",
+		Title:       postInfo.Post.Title,
+		URL:         fmt.Sprintf("https://kemono.cr/%s/user/%s/post/%s", info.ServiceName, info.UserID, info.PostID),
+		Author:      postInfo.Post.User, // [TODO] request user profile
+		Description: postInfo.Post.Content,
+		Tags: func() []string {
+			if postInfo.Post.Tags != nil {
+				return *postInfo.Post.Tags
+			}
+			return nil
+		}(),
+	}
+	resources := make([]parser.Resource, 0)
+	for _, attachment := range postInfo.Attachments {
+		if attachment.Server == nil || attachment.Path == nil || attachment.Name == nil {
+			continue
+		}
+		var size int64
+		fileUrl := fmt.Sprintf("%s/data%s", *attachment.Server, *attachment.Path)
+		headReq, err := http.NewRequestWithContext(ctx, http.MethodHead, fileUrl, nil)
+		if err == nil {
+			resp, err := client.Do(headReq)
+			if err == nil {
+				size = resp.ContentLength
+				resp.Body.Close()
+			}
+		}
+		resources = append(resources, parser.Resource{
+			URL:      fmt.Sprintf("%s/data%s", *attachment.Server, *attachment.Path),
+			Filename: *attachment.Name,
+			Size:     size,
+		})
+	}
+	picCdnMap := make(map[string]string)
+	for _, preview := range postInfo.Previews {
+		if preview.Type == nil || *preview.Type != "thumbnail" {
+			continue
+		}
+		picCdnMap[*preview.Path] = *preview.Server
+	}
+	for _, attachment := range postInfo.Post.Attachments {
+		if !isImageExt(*attachment.Path) {
+			continue
+		}
+		picUrl, err := url.JoinPath(picCdnMap[*attachment.Path], "data", *attachment.Path)
+		if err != nil {
+			continue
+		}
+		var size int64
+		headReq, err := http.NewRequestWithContext(ctx, http.MethodHead, picUrl, nil)
+		if err == nil {
+			resp, err := client.Do(headReq)
+			if err == nil {
+				size = resp.ContentLength
+				resp.Body.Close()
+			}
+		}
+		resources = append(resources, parser.Resource{
+			URL:      picUrl,
+			Filename: *attachment.Name,
+			Size:     size,
+		})
+	}
+	item.Resources = resources
+	return item, nil
+}
+
+func (k *KemonoParser) parseUserPage(_ context.Context, _ *DownloadInfo) (*parser.Item, error) {
+	return nil, errors.New("kemono user page not implemented")
+}
+
+func isImageExt(attachmentPath string) bool {
+	return strutil.HasSuffixAny(path.Ext(strings.Split(attachmentPath, "?")[0]), []string{".jpg", ".jpeg", ".png", ".webp"})
+}