Zip bundles: generate cutesy zip display names

internal/file/zip.go

@@ -2,9 +2,11 @@ package file
 
 import (
 	"archive/zip"
+	"crypto/rand"
 	"errors"
 	"fmt"
 	"io"
+	"math/big"
 	"mime/multipart"
 	"os"
 	"path/filepath"
@@ -36,6 +38,36 @@ func dedupeName(name string, seen map[string]int) string {
 	return fmt.Sprintf("%s (%d)%s", base, seen[name], ext)
 }
 
+func randIndex(n int) int {
+	if n <= 0 {
+		return 0
+	}
+	x, err := rand.Int(rand.Reader, big.NewInt(int64(n)))
+	if err != nil {
+		return 0
+	}
+	return int(x.Int64())
+}
+
+func cuteZipName(fileCount int) string {
+	adjectives := []string{
+		"Cool", "Super", "Hot", "Spicy", "Sneaky", "Sleepy", "Tiny", "Mega", "Cosmic", "Silly",
+		"Cursed", "Blessed", "Wiggly", "Giga", "Chonky", "Shiny", "Angry", "Happy", "Soft", "Turbo",
+	}
+	things := []string{
+		"Potato", "Griefers", "Raccoons", "Pigeons", "Wizards", "Ninjas", "Pickles", "Dragons", "Goblins", "Burgers",
+		"Pancakes", "Hamsters", "Bananas", "Comets", "Robots", "Cats", "Kiwis", "Frogs", "Cupcakes", "Sprites",
+	}
+	verbs := []string{
+		"Zoom", "Bonk", "Yeet", "Vibe", "Hack", "Spark", "Bounce", "Nibble", "Smuggle", "Cook",
+	}
+
+	a := adjectives[randIndex(len(adjectives))]
+	v := verbs[randIndex(len(verbs))]
+	t := things[randIndex(len(things))]
+	return fmt.Sprintf("%d%s%s%s.zip", fileCount, a, v, t)
+}
+
 // UploadBundle zips multiple uploaded files into a single .zip stored on disk and tracked as one FileRecord.
 func (s *Service) UploadBundle(files []*multipart.FileHeader, deleteAfterDownload bool, expiresAfter time.Duration) (*FileRecord, error) {
 	if len(files) == 0 {
@@ -105,7 +137,7 @@ func (s *Service) UploadBundle(files []*multipart.FileHeader, deleteAfterDownloa
 		return nil, closeErr
 	}
 
-	zipDisplayName := fmt.Sprintf("bundle-%d-files.zip", len(files))
+	zipDisplayName := cuteZipName(len(files))
 
 	f := &FileRecord{
 		ID:                  folderID,