feat(ogimage): render custom OG images for archive files

Add support for generating and rendering rich Open Graph (OG) image cards for archive files. When an archive file is shared, the handler now fetches or generates its listing metadata and renders a custom card displaying file/folder counts, uncompressed size, and a visual representation of the archive's contents.

backend/libs/handlers/ogimage.go

@@ -2,6 +2,7 @@ package handlers
 
 import (
 	"bytes"
+	"encoding/json"
 	"fmt"
 	"image"
 	"image/color"
@@ -23,6 +24,7 @@ import (
 	_ "golang.org/x/image/webp"
 
 	"warpbox.dev/backend/libs/helpers"
+	"warpbox.dev/backend/libs/jobs"
 	"warpbox.dev/backend/libs/services"
 )
 
@@ -95,10 +97,65 @@ func (a *App) FileOGImage(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
+	if jobs.NeedsArchiveListing(file) {
+		if listing, ok := a.archiveListingForOG(r, box, file); ok {
+			a.serveOGImage(w, r, a.renderArchiveCard(file, listing))
+			return
+		}
+	}
+
 	icon := a.ogFileIcon(file)
 	a.serveOGImage(w, r, a.renderFileCard(file, icon))
 }
 
+type ogArchiveListing struct {
+	Name             string         `json:"name"`
+	Type             string         `json:"type"`
+	FileCount        int            `json:"fileCount"`
+	FolderCount      int            `json:"folderCount"`
+	UncompressedSize uint64         `json:"uncompressedSize"`
+	Root             *ogArchiveNode `json:"root"`
+}
+
+type ogArchiveNode struct {
+	Name  string           `json:"name"`
+	Size  uint64           `json:"size,omitempty"`
+	Dir   bool             `json:"dir"`
+	Icon  string           `json:"icon,omitempty"`
+	Items []*ogArchiveNode `json:"items,omitempty"`
+}
+
+func (a *App) archiveListingForOG(r *http.Request, box services.Box, file services.File) (ogArchiveListing, bool) {
+	if strings.ToLower(filepath.Ext(file.ArchiveListing)) != ".json" {
+		if listing := a.generateMissingArchiveListingForRequest(r, box, file); listing != "" {
+			file.ArchiveListing = listing
+			file.ArchiveListingObjectKey = ""
+		}
+	}
+
+	object, err := a.uploadService.OpenArchiveListingObject(r.Context(), box, file)
+	if err != nil {
+		if listing := a.generateMissingArchiveListingForRequest(r, box, file); listing != "" {
+			file.ArchiveListing = listing
+			file.ArchiveListingObjectKey = ""
+			object, err = a.uploadService.OpenArchiveListingObject(r.Context(), box, file)
+		}
+	}
+	if err != nil {
+		return ogArchiveListing{}, false
+	}
+	defer object.Body.Close()
+
+	var listing ogArchiveListing
+	if err := json.NewDecoder(object.Body).Decode(&listing); err != nil {
+		return ogArchiveListing{}, false
+	}
+	if listing.Root == nil {
+		return ogArchiveListing{}, false
+	}
+	return listing, true
+}
+
 func (a *App) serveOGImage(w http.ResponseWriter, r *http.Request, img image.Image) {
 	var buf bytes.Buffer
 	if err := jpeg.Encode(&buf, img, &jpeg.Options{Quality: 85}); err != nil {
@@ -213,6 +270,174 @@ func (a *App) renderFileCard(file services.File, icon image.Image) image.Image {
 	return canvas
 }
 
+func (a *App) renderArchiveCard(file services.File, listing ogArchiveListing) image.Image {
+	canvas := image.NewRGBA(image.Rect(0, 0, ogImageWidth, ogImageHeight))
+	draw.Draw(canvas, canvas.Bounds(), &image.Uniform{ogBackground}, image.Point{}, draw.Src)
+
+	panel := image.Rect(70, 54, ogImageWidth-70, ogImageHeight-54)
+	draw.Draw(canvas, panel, &image.Uniform{color.RGBA{R: 0x17, G: 0x14, B: 0x2d, A: 0xff}}, image.Point{}, draw.Src)
+	draw.Draw(canvas, image.Rect(panel.Min.X, panel.Min.Y, panel.Max.X, panel.Min.Y+6), &image.Uniform{color.RGBA{R: 0xa7, G: 0x8b, B: 0xfa, A: 0xff}}, image.Point{}, draw.Src)
+
+	titleFace := a.ogFont(36, true)
+	bodyFace := a.ogFont(22, false)
+	treeFace := a.ogFont(19, false)
+	labelFace := a.ogFont(17, true)
+
+	icon := a.ogFileIcon(file)
+	if icon != nil {
+		xdraw.NearestNeighbor.Scale(canvas, image.Rect(104, 92, 182, 170), icon, icon.Bounds(), xdraw.Over, nil)
+	} else {
+		draw.Draw(canvas, image.Rect(104, 92, 182, 170), &image.Uniform{color.RGBA{R: 0x21, G: 0x1b, B: 0x3e, A: 0xff}}, image.Point{}, draw.Src)
+	}
+
+	title := listing.Name
+	if strings.TrimSpace(title) == "" {
+		title = file.Name
+	}
+	titleLines := wrapOGText(title, titleFace, 820)
+	if len(titleLines) > 2 {
+		titleLines = titleLines[:2]
+		titleLines[1] = trimOGText(titleLines[1], titleFace, 820)
+	}
+	y := 106
+	for _, line := range titleLines {
+		drawOGText(canvas, titleFace, line, 204, y, color.RGBA{R: 0xf5, G: 0xf3, B: 0xff, A: 0xff})
+		y += 42
+	}
+
+	meta := fmt.Sprintf("%s · %d files · %d folders · %s unpacked", archiveTypeLabel(listing, file), listing.FileCount, listing.FolderCount, formatOGArchiveBytes(listing.UncompressedSize))
+	drawOGText(canvas, bodyFace, trimOGText(meta, bodyFace, 840), 204, y+14, color.RGBA{R: 0xaa, G: 0xa4, B: 0xd6, A: 0xff})
+
+	treePanel := image.Rect(104, 214, 1096, 548)
+	draw.Draw(canvas, treePanel, &image.Uniform{color.RGBA{R: 0x0f, G: 0x11, B: 0x1a, A: 0xff}}, image.Point{}, draw.Src)
+	draw.Draw(canvas, image.Rect(treePanel.Min.X, treePanel.Min.Y, treePanel.Max.X, treePanel.Min.Y+38), &image.Uniform{color.RGBA{R: 0x21, G: 0x1b, B: 0x3e, A: 0xff}}, image.Point{}, draw.Src)
+	drawOGText(canvas, labelFace, "Archive Preview", treePanel.Min.X+18, treePanel.Min.Y+25, color.RGBA{R: 0xc4, G: 0xb5, B: 0xfd, A: 0xff})
+
+	rows := archiveOGRows(listing.Root, 13)
+	rowY := treePanel.Min.Y + 64
+	for _, row := range rows {
+		if row.Ellipsis {
+			drawOGText(canvas, treeFace, "... more files inside", treePanel.Min.X+24, rowY, color.RGBA{R: 0xaa, G: 0xa4, B: 0xd6, A: 0xff})
+			break
+		}
+		x := treePanel.Min.X + 20 + row.Depth*28
+		drawArchiveOGIcon(canvas, row.Icon, x, rowY-17)
+		name := row.Name
+		if row.Dir {
+			name += "/"
+		}
+		maxNameWidth := treePanel.Max.X - x - 170
+		drawOGText(canvas, treeFace, trimOGText(name, treeFace, maxNameWidth), x+32, rowY, archiveOGTextColor(row))
+		if !row.Dir {
+			size := formatOGArchiveBytes(row.Size)
+			drawOGText(canvas, treeFace, size, treePanel.Max.X-142, rowY, color.RGBA{R: 0x94, G: 0xa3, B: 0xb8, A: 0xff})
+		}
+		rowY += 23
+	}
+
+	drawOGText(canvas, bodyFace, "warpbox.dev", 920, 592, color.RGBA{R: 0xaa, G: 0xa4, B: 0xd6, A: 0xff})
+	return canvas
+}
+
+type archiveOGRow struct {
+	Name     string
+	Icon     string
+	Size     uint64
+	Dir      bool
+	Depth    int
+	Ellipsis bool
+}
+
+func archiveOGRows(root *ogArchiveNode, limit int) []archiveOGRow {
+	rows := make([]archiveOGRow, 0, limit+1)
+	truncated := false
+	var walk func(items []*ogArchiveNode, depth int)
+	walk = func(items []*ogArchiveNode, depth int) {
+		for _, item := range items {
+			if len(rows) >= limit {
+				truncated = true
+				return
+			}
+			icon := item.Icon
+			if item.Dir {
+				icon = "folder"
+			}
+			rows = append(rows, archiveOGRow{Name: item.Name, Icon: icon, Size: item.Size, Dir: item.Dir, Depth: depth})
+			if item.Dir {
+				walk(item.Items, depth+1)
+			}
+		}
+	}
+	if root != nil {
+		walk(root.Items, 0)
+	}
+	if truncated {
+		rows = append(rows, archiveOGRow{Ellipsis: true})
+	}
+	return rows
+}
+
+func drawArchiveOGIcon(dst *image.RGBA, icon string, x, y int) {
+	c := archiveOGIconColor(icon)
+	rect := image.Rect(x, y, x+20, y+20)
+	draw.Draw(dst, rect, &image.Uniform{color.RGBA{R: 0x21, G: 0x1b, B: 0x3e, A: 0xff}}, image.Point{}, draw.Src)
+	draw.Draw(dst, image.Rect(x+3, y+4, x+17, y+17), &image.Uniform{c}, image.Point{}, draw.Src)
+	if icon == "folder" {
+		draw.Draw(dst, image.Rect(x+3, y+2, x+11, y+6), &image.Uniform{c}, image.Point{}, draw.Src)
+	}
+}
+
+func archiveOGIconColor(icon string) color.RGBA {
+	switch icon {
+	case "folder":
+		return color.RGBA{R: 0xf6, G: 0xc1, B: 0x77, A: 0xff}
+	case "img":
+		return color.RGBA{R: 0x67, G: 0xe8, B: 0xf9, A: 0xff}
+	case "vid":
+		return color.RGBA{R: 0xf9, G: 0xa8, B: 0xd4, A: 0xff}
+	case "aud":
+		return color.RGBA{R: 0x86, G: 0xef, B: 0xac, A: 0xff}
+	case "code":
+		return color.RGBA{R: 0xc4, G: 0xb5, B: 0xfd, A: 0xff}
+	case "arc":
+		return color.RGBA{R: 0xfc, G: 0xd3, B: 0x4d, A: 0xff}
+	default:
+		return color.RGBA{R: 0xe2, G: 0xe8, B: 0xf0, A: 0xff}
+	}
+}
+
+func archiveOGTextColor(row archiveOGRow) color.RGBA {
+	if row.Dir {
+		return color.RGBA{R: 0xff, G: 0xfb, B: 0xeb, A: 0xff}
+	}
+	return color.RGBA{R: 0xd8, G: 0xd2, B: 0xff, A: 0xff}
+}
+
+func archiveTypeLabel(listing ogArchiveListing, file services.File) string {
+	if strings.TrimSpace(listing.Type) != "" {
+		return listing.Type
+	}
+	if strings.TrimSpace(file.ContentType) != "" {
+		return file.ContentType
+	}
+	return "Archive"
+}
+
+func formatOGArchiveBytes(size uint64) string {
+	const unit = 1024
+	if size < unit {
+		return fmt.Sprintf("%d B", size)
+	}
+	value := float64(size) / unit
+	for _, suffix := range []string{"KiB", "MiB", "GiB", "TiB"} {
+		if value < unit {
+			return fmt.Sprintf("%.1f %s", value, suffix)
+		}
+		value /= unit
+	}
+	return fmt.Sprintf("%.1f PiB", value)
+}
+
 func fileCardInfo(file services.File) string {
 	switch {
 	case strings.HasPrefix(file.ContentType, "audio/"):

backend/static/css/30-download.css

@@ -54,6 +54,20 @@
   margin: 0.45rem 0 0;
 }
 
+.preview-header > .button {
+  flex: 0 0 auto;
+  padding-inline: 1rem;
+  overflow: visible;
+}
+
+.preview-header > .button svg {
+  flex: 0 0 auto;
+}
+
+[data-theme="retro"] .preview-header > .button-primary:active {
+  padding-right: calc(1rem - 1px);
+}
+
 .preview-window {
   overflow: hidden;
   border: 1px solid color-mix(in srgb, var(--border) 78%, var(--primary));