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better support for image srcset attributes as discussed in https://community.tt-rss.org/t/problem-with-img-srcset/3519

This commit is contained in:
Andrew Dolgov 2020-06-15 11:58:59 +03:00
parent 697418f863
commit 6eb94f1e13
3 changed files with 43 additions and 25 deletions
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13
classes/diskcache.php
View File

@ -314,22 +314,19 @@ class DiskCache {
}
if ($entry->hasAttribute("srcset")) {
$tokens = explode(",", $entry->getAttribute('srcset'));
$matches = RSSUtils::decode_srcset($entry->getAttribute('srcset'));
for ($i = 0; $i < count($tokens); $i++) {
$token = trim($tokens[$i]);
list ($url, $width) = explode(" ", $token, 2);
$cached_filename = sha1($url);
for ($i = 0; $i < count($matches); $i++) {
$cached_filename = sha1($matches[$i]["url"]);
if ($cache->exists($cached_filename)) {
$tokens[$i] = $cache->getUrl($cached_filename) . " " . $width;
$matches[$i]["url"] = $cache->getUrl($cached_filename);
$need_saving = true;
}
}
$entry->setAttribute("srcset", implode(", ", $tokens));
$entry->setAttribute("srcset", RSSUtils::encode_srcset($matches));
}
}

41
classes/rssutils.php
View File

@ -1196,6 +1196,7 @@ class RSSUtils {
return true;
}
/* TODO: move to DiskCache? */
static function cache_enclosures($enclosures, $site_url) {
$cache = new DiskCache("images");
@ -1231,6 +1232,7 @@ class RSSUtils {
}
}
/* TODO: move to DiskCache? */
static function cache_media_url($cache, $url, $site_url) {
$url = rewrite_relative_url($site_url, $url);
$local_filename = sha1($url);
@ -1257,6 +1259,7 @@ class RSSUtils {
}
}
/* TODO: move to DiskCache? */
static function cache_media($html, $site_url) {
$cache = new DiskCache("images");
@ -1275,14 +1278,10 @@ class RSSUtils {
}
if ($entry->hasAttribute("srcset")) {
$tokens = explode(",", $entry->getAttribute('srcset'));
$matches = RSSUtils::decode_srcset($entry->getAttribute('srcset'));
for ($i = 0; $i < count($tokens); $i++) {
$token = trim($tokens[$i]);
list ($url, $width) = explode(" ", $token, 2);
RSSUtils::cache_media_url($cache, $url, $site_url);
for ($i = 0; $i < count($matches); $i++) {
RSSUtils::cache_media_url($cache, $matches[$i]["url"], $site_url);
}
}
}
@ -1738,4 +1737,32 @@ class RSSUtils {
return $favicon_url;
}
// https://community.tt-rss.org/t/problem-with-img-srcset/3519
static function decode_srcset($srcset) {
$matches = [];
preg_match_all(
'/(?:\A|,)\s*(?P<url>(?!,)\S+(?<!,))\s*(?P<size>\s\d+w|\s\d+(?:\.\d+)?(?:[eE][+-]?\d+)?x|)\s*(?=,|\Z)/',
$srcset, $matches, PREG_SET_ORDER
);
foreach ($matches as $m) {
array_push($matches, [
"url" => trim($m["url"]),
"size" => trim($m["size"])
]);
}
return $matches;
}
static function encode_srcset($matches) {
$tokens = [];
foreach ($matches as $m) {
array_push($tokens, trim($m["url"]) . " " . trim($m["size"]));
}
return implode(",", $tokens);
}
}

14
include/functions.php
View File

@ -1289,19 +1289,13 @@
}
if ($entry->hasAttribute('srcset')) {
$tokens = explode(",", $entry->getAttribute('srcset'));
$matches = RSSUtils::decode_srcset($entry->getAttribute('srcset'));
for ($i = 0; $i < count($tokens); $i++) {
$token = trim($tokens[$i]);
list ($url, $width) = explode(" ", $token, 2);
$url = rewrite_relative_url($rewrite_base_url, $url);
$tokens[$i] = "$url $width";
for ($i = 0; $i < count($matches); $i++) {
$matches[$i]["url"] = rewrite_relative_url($rewrite_base_url, $matches[$i]["url"]);
}
$entry->setAttribute("srcset", implode(", ", $tokens));
$entry->setAttribute("srcset", RSSUtils::encode_srcset($matches));
}
if ($entry->hasAttribute('src') &&