| 1 | package main |
| 2 | |
| 3 | import ( |
| 4 | "net/url" |
| 5 | "path" |
| 6 | "strings" |
| 7 | ) |
| 8 | |
| 9 | func isImageName(name string) bool { |
| 10 | switch strings.ToLower(path.Ext(name)) { |
| 11 | case ".png", ".jpg", ".jpeg", ".gif", ".webp", ".svg", ".avif", ".bmp", ".ico": |
| 12 | return true |
| 13 | } |
| 14 | return false |
| 15 | } |
| 16 | |
| 17 | func humanSize(n int64) string { |
| 18 | const k = 1024 |
| 19 | if n < k { |
| 20 | return formatInt(n) + " B" |
| 21 | } |
| 22 | v := float64(n) / float64(k) |
| 23 | if v < k { |
| 24 | return formatFloat1(v) + " KB" |
| 25 | } |
| 26 | v /= k |
| 27 | if v < k { |
| 28 | return formatFloat1(v) + " MB" |
| 29 | } |
| 30 | v /= k |
| 31 | return formatFloat1(v) + " GB" |
| 32 | } |
| 33 | |
| 34 | func formatInt(n int64) string { |
| 35 | if n == 0 { |
| 36 | return "0" |
| 37 | } |
| 38 | neg := n < 0 |
| 39 | if neg { |
| 40 | n = -n |
| 41 | } |
| 42 | buf := [24]byte{} |
| 43 | i := len(buf) |
| 44 | for n > 0 { |
| 45 | i-- |
| 46 | buf[i] = byte('0' + n%10) |
| 47 | n /= 10 |
| 48 | } |
| 49 | if neg { |
| 50 | i-- |
| 51 | buf[i] = '-' |
| 52 | } |
| 53 | return string(buf[i:]) |
| 54 | } |
| 55 | |
| 56 | func formatFloat1(v float64) string { |
| 57 | scaled := int64(v*10 + 0.5) |
| 58 | whole := scaled / 10 |
| 59 | frac := scaled % 10 |
| 60 | return formatInt(whole) + "." + string(byte('0'+frac)) |
| 61 | } |
| 62 | |
| 63 | // escapeKeyPath URL-escapes each path segment of an S3 key for use in app routes. |
| 64 | // Slashes are preserved as separators. |
| 65 | func escapeKeyPath(key string) string { |
| 66 | parts := strings.Split(key, "/") |
| 67 | for i, p := range parts { |
| 68 | parts[i] = url.PathEscape(p) |
| 69 | } |
| 70 | return strings.Join(parts, "/") |
| 71 | } |
| 72 | |
| 73 | // browseHref builds /b/{bucket}/browse/{prefix} (trailing slash preserved). |
| 74 | func browseHref(bucket, prefix string) string { |
| 75 | if prefix == "" { |
| 76 | return "/b/" + url.PathEscape(bucket) + "/browse/" |
| 77 | } |
| 78 | return "/b/" + url.PathEscape(bucket) + "/browse/" + escapeKeyPath(prefix) |
| 79 | } |
| 80 | |
| 81 | func objectHref(bucket, key string) string { |
| 82 | return "/b/" + url.PathEscape(bucket) + "/object/" + escapeKeyPath(key) |
| 83 | } |
| 84 | |
| 85 | func previewHref(bucket, key string) string { |
| 86 | return "/b/" + url.PathEscape(bucket) + "/preview/" + escapeKeyPath(key) |
| 87 | } |
| 88 | |
| 89 | // buildCrumbs builds breadcrumb entries for the given bucket + prefix. |
| 90 | // The bucket crumb links to the bucket root; each segment links to its |
| 91 | // prefix browse URL. |
| 92 | func buildCrumbs(bucket, prefix string) []crumb { |
| 93 | out := []crumb{{Label: bucket, Href: browseHref(bucket, "")}} |
| 94 | if prefix == "" { |
| 95 | return out |
| 96 | } |
| 97 | trimmed := strings.TrimSuffix(prefix, "/") |
| 98 | parts := strings.Split(trimmed, "/") |
| 99 | acc := "" |
| 100 | for _, p := range parts { |
| 101 | if p == "" { |
| 102 | continue |
| 103 | } |
| 104 | acc += p + "/" |
| 105 | out = append(out, crumb{Label: p, Href: browseHref(bucket, acc)}) |
| 106 | } |
| 107 | return out |
| 108 | } |
| 109 | |
| 110 | // parentPrefix returns the prefix one level up from the given prefix (which |
| 111 | // is expected to end in "/" or be empty). For object keys, use parentOfKey. |
| 112 | func parentPrefix(prefix string) string { |
| 113 | trimmed := strings.TrimSuffix(prefix, "/") |
| 114 | if trimmed == "" { |
| 115 | return "" |
| 116 | } |
| 117 | i := strings.LastIndex(trimmed, "/") |
| 118 | if i < 0 { |
| 119 | return "" |
| 120 | } |
| 121 | return trimmed[:i+1] |
| 122 | } |
| 123 | |
| 124 | func parentOfKey(key string) string { |
| 125 | i := strings.LastIndex(key, "/") |
| 126 | if i < 0 { |
| 127 | return "" |
| 128 | } |
| 129 | return key[:i+1] |
| 130 | } |
| 131 | |
| 132 | func nameOfKey(key string) string { |
| 133 | i := strings.LastIndex(key, "/") |
| 134 | if i < 0 { |
| 135 | return key |
| 136 | } |
| 137 | return key[i+1:] |
| 138 | } |
| 139 | |
| 140 | // parsePublicURLs parses a "bucket=url,bucket=url" string into a map. |
| 141 | func parsePublicURLs(raw string) map[string]string { |
| 142 | out := map[string]string{} |
| 143 | if strings.TrimSpace(raw) == "" { |
| 144 | return out |
| 145 | } |
| 146 | for _, pair := range strings.Split(raw, ",") { |
| 147 | pair = strings.TrimSpace(pair) |
| 148 | if pair == "" { |
| 149 | continue |
| 150 | } |
| 151 | eq := strings.IndexByte(pair, '=') |
| 152 | if eq <= 0 { |
| 153 | continue |
| 154 | } |
| 155 | k := strings.TrimSpace(pair[:eq]) |
| 156 | v := strings.TrimSpace(pair[eq+1:]) |
| 157 | if k != "" && v != "" { |
| 158 | out[k] = v |
| 159 | } |
| 160 | } |
| 161 | return out |
| 162 | } |