fix: avoid out of bounds error when rendering short hashes

The panic is caught higher up the stack so it can't crash the node, but
it's still "not good".

core/corehttp/gateway_indexPage.go

@@ -75,6 +75,9 @@ func breadcrumbs(urlPath string, dnslinkOrigin bool) []breadcrumb {
 }
 
 func shortHash(hash string) string {
+	if len(hash) <= 8 {
+		return hash
+	}
 	return (hash[0:4] + "\u2026" + hash[len(hash)-4:])
 }
 

test/sharness/t0046-id-hash.sh

@@ -106,4 +106,23 @@ test_expect_success "but can fetch it anyway (filestore enabled)" '
   test_cmp junk.txt actual
 '
 
+test_launch_ipfs_daemon
+
+test_expect_success "can add a directory with an inline file" '
+  echo "$ID_HASH0_CONTENTS" > file.txt &&
+  HASH="$(ipfs add -Q -w --raw-leaves --inline file.txt)"
+'
+
+test_expect_success "the hash matches" '
+  ipfs files stat --hash "/ipfs/$HASH/file.txt" &&
+  [[ "$(ipfs files stat --hash "/ipfs/$HASH/file.txt")" == "$ID_HASH0" ]]
+'
+
+test_expect_success "directory listing works" '
+  curl "$GWAY_ADDR/ipfs/$HASH" > list_response &&
+  test_should_contain "$ID_HASH0" list_response
+'
+
+test_kill_ipfs_daemon
+
 test_done