Altair-sh
109 lines
2.5 KiB
Go
109 lines
2.5 KiB
Go
package html
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import (
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"os"
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"path"
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"serveg/internal/http"
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"serveg/internal/log"
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sh "serveg/internal/string_helper"
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)
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type listingRow struct {
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name string // html-escaped
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url string // url-encoded
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mtime string // formatted with DateTimeTZ
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size string // formatted with HumanBytes
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isDir bool
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}
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func (row *listingRow) genHtml(sb *sh.StringBuilder) {
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sb.AddS(`<tr>`)
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sb.AddS(`<td><a href="`).AddS(row.url)
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if row.isDir {
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// add slash to directory url
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// because browser remembers password for directory with trailing slash
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sb.AddS(`/">`)
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} else {
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// tell browser to download file instead of opening in new tab
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sb.AddS(`" download>`)
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}
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sb.AddS(row.name).AddS(`</a></td>`)
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sb.AddS(`<td class="size">`).AddS(row.size).AddS(`</td>`)
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sb.AddS(`<td class="date">`).AddS(row.mtime).AddS(`</td>`)
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sb.AddS(`</tr>`)
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}
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func GenDirListingHtml(logger *log.LoggerContext, dirPath, reqUrl, pageTitle string) ([]byte, error) {
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dirEntries, err := os.ReadDir(dirPath)
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if err != nil {
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return nil, err
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}
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var dirs, files []listingRow
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var estimatedLen = 460 // html for page without entries
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for _, e := range dirEntries {
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einf, err := e.Info()
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if err != nil {
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return nil, err
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}
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row := listingRow{
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name: htmlEscape(e.Name()),
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url: http.PercentEcodeUrl(path.Join(reqUrl, e.Name())),
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mtime: einf.ModTime().Format(DateTimeTZ),
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isDir: e.IsDir(),
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}
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if row.isDir {
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row.size = "DIR"
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dirs = append(dirs, row)
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} else {
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row.size = sh.HumanBytes(einf.Size())
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files = append(files, row)
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}
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estimatedLen += len(row.name) + len(row.url) + len(row.mtime) + len(row.size)
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estimatedLen += 100 // html for row
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}
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sb := sh.StringBuilder{Buf: make([]byte, 0, estimatedLen)}
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sb.AddS(`<!doctype html>
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<html>
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<head>
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<meta charset="utf-8">
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<title>`)
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sb.AddS(htmlEscape(pageTitle + " " + reqUrl))
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sb.AddS(`
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</title>
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<style>
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body { font-family: sans-serif; margin: 2em; }
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td { padding: .2em 1em .2em 0; }
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td.size, td.date { color: #666; white-space: nowrap; }
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</style>
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</head>
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<body>`)
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sb.AddS("<h1>").AddS(htmlEscape(reqUrl)).AddS("</h1>")
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sb.AddS(`<table id="listing">`)
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sb.AddS(`<tr><td><a href="`)
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sb.AddS(http.PercentEcodeUrl(path.Dir(reqUrl)))
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sb.AddS(`">../</a></td></tr>`)
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for i := 0; i < len(dirs); i++ {
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dirs[i].genHtml(&sb)
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}
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for i := 0; i < len(files); i++ {
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files[i].genHtml(&sb)
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}
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sb.AddS(`
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</table>
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</body>
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</html>`)
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realLen := sb.Len()
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if estimatedLen < realLen {
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logger.Warn("genDirListingHtml(): size prediction failed. estimatedLen: ",
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estimatedLen, " realLen: ", realLen)
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}
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return sb.Buf, nil
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}
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