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Add Ebook::DownloadUrl for web and feed downloads

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This commit adds a rewrite rule for ebook downloads of the form:

```
/ebooks/some-author/some-book/downloads/some-filename.epub
```

to `www/ebooks/download.php`. That file handles the logic of whether to
show a thank you page before beginning the download.

Download URLs in RSS, Atom, and OPDS feeds follow the same pattern, but
they have a query string parameter `?source=feed` to always skip the
thank you page.
This commit is contained in:
Mike Colagrosso 2025-04-24 16:20:44 -06:00 • committed by Alex Cabal
parent 1f41eb1e55
commit 03ed3c2257
10 changed files with 99 additions and 36 deletions
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44
www/ebooks/download.php
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@ -1,12 +1,17 @@
<?
use Safe\DateTimeImmutable;
// If the user is not logged in, or has less than some amount of downloads, show a thank-you page.
$ebook = null;
$downloadCount = HttpInput::Int(COOKIE, 'download-count') ?? 0;
$showThankYouPage = Session::$User === null && $downloadCount < 5;
$downloadUrl = null;
$downloadCount = HttpInput::Int(COOKIE, 'download-count') ?? 0;
$source = Enums\EbookDownloadSource::tryFrom(HttpInput::Str(GET, 'source') ?? '');
// Skip the thank you page if any of these are true:
// * The user is logged in.
// * Their `download-count` cookie is above some amount.
// * The link is from a specific source.
$skipThankYouPage = isset(Session::$User) || $downloadCount > 4 || isset($source);
try{
$urlPath = HttpInput::Str(GET, 'url-path') ?? null;
@ -17,28 +22,21 @@ try{
throw new Exceptions\InvalidFileException();
}
$format = Enums\EbookFormatType::tryFrom(HttpInput::Str(GET, 'format') ?? '') ?? Enums\EbookFormatType::Epub;
switch($format){
case Enums\EbookFormatType::Kepub:
$downloadUrl = $ebook->KepubUrl;
break;
case Enums\EbookFormatType::Azw3:
$downloadUrl = $ebook->Azw3Url;
break;
case Enums\EbookFormatType::AdvancedEpub:
$downloadUrl = $ebook->AdvancedEpubUrl;
break;
case Enums\EbookFormatType::Epub:
default:
$downloadUrl = $ebook->EpubUrl;
break;
$filename = HttpInput::Str(GET, 'filename');
if(!isset($filename)){
throw new Exceptions\InvalidFileException();
}
if(!$showThankYouPage){
try{
$format = Enums\EbookFormatType::FromFilename($filename);
}
catch(Exceptions\InvalidEbookFormatException){
throw new Exceptions\InvalidFileException();
}
if($skipThankYouPage){
// Download the file directly, without showing the thank you page.
$downloadUrl = $ebook->GetDownloadUrl($format);
$downloadPath = WEB_ROOT . $downloadUrl;
if(!is_file($downloadPath)){
@ -54,6 +52,8 @@ try{
exit();
}
$downloadUrl = $ebook->GetDownloadUrl($format, Enums\EbookDownloadSource::DownloadPage);
// Increment local download count, expires in 2 weeks.
$downloadCount++;
setcookie('download-count', (string)$downloadCount, ['expires' => intval((new DateTimeImmutable('+2 week'))->format(Enums\DateTimeFormat::UnixTimestamp->value)), 'path' => '/', 'domain' => SITE_DOMAIN, 'secure' => true, 'httponly' => false, 'samesite' => 'Lax']);