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<?php
/*
* This file is part of the API Platform project.
*
* (c) Kévin Dunglas <dunglas@gmail.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
declare
(strict_types=
1
);
namespace
ApiPlatform
\
HttpCache
;
use
Symfony
\
Contracts
\
HttpClient
\
HttpClientInterface
;
/**
* Purges Varnish.
*
* @author Kévin Dunglas <dunglas@gmail.com>
*/
final
class
VarnishPurger
implements
PurgerInterface
{
private
const
DEFAULT_VARNISH_MAX_HEADER_LENGTH
=
8000
;
private
const
REGEXP_PATTERN
=
'
(%s)($|\,)
'
;
private
readonly
int
$
maxHeaderLength
;
/**
* @param HttpClientInterface[] $clients
*/
public
function
__construct
(
private
readonly
iterable
$
clients
,
int
$
maxHeaderLength
=
self
::
DEFAULT_VARNISH_MAX_HEADER_LENGTH
)
{
$
this
->
maxHeaderLength
=
$
maxHeaderLength
-
mb_strlen
(
self
::
REGEXP_PATTERN
) +
2
;
// 2 for %s
}
/**
* Calculate how many tags fit into the header.
*
* This assumes that the tags are separated by one character.
*
* From https://github.com/FriendsOfSymfony/FOSHttpCache/blob/2.8.0/src/ProxyClient/HttpProxyClient.php#L137
*
* @param string[] $escapedTags
* @param string $glue The concatenation string to use
*
* @return int Number of tags per tag invalidation request
*/
private
function
determineTagsPerHeader
(
array
$
escapedTags
,
string
$
glue
):
int
{
if
(
mb_strlen
(
implode
(
$
glue
,
$
escapedTags
)) <
$
this
->
maxHeaderLength
) {
return
\count
(
$
escapedTags
);
}
/*
* estimate the amount of tags to invalidate by dividing the max
* header length by the largest tag (minus the glue length)
*/
$
tagsize
=
max
(
array_map
(
'
mb_strlen
'
,
$
escapedTags
));
$
gluesize
=
\strlen
(
$
glue
);
return
(
int
)
floor
((
$
this
->
maxHeaderLength
+
$
gluesize
) / (
$
tagsize
+
$
gluesize
)) ?:
1
;
}
/**
* {@inheritdoc}
*/
public
function
purge
(
array
$
iris
):
void
{
if
(!
$
iris
) {
return
;
}
$
chunkSize
=
$
this
->
determineTagsPerHeader
(
$
iris
,
'
|
'
);
$
irisChunks
=
array_chunk
(
$
iris
,
$
chunkSize
);
foreach
(
$
irisChunks
as
$
irisChunk
) {
$
this
->
purgeRequest
(
$
irisChunk
);
}
}
/**
* {@inheritdoc}
*/
public
function
getResponseHeaders
(
array
$
iris
):
array
{
return
[
'
Cache-Tags
'
=>
implode
(
'
,
'
,
$
iris
)];
}
private
function
purgeRequest
(
array
$
iris
):
void
{
// Create the regex to purge all tags in just one request
$
parts
=
array_map
(
static
fn
(
$
iri
):
string
=>
// here we should remove the prefix as it's not discriminent and cost a lot to compute
preg_quote
(
$
iri
),
$
iris
);
foreach
(
$
this
->
chunkRegexParts
(
$
parts
)
as
$
regex
) {
$
regex
=
\sprintf
(
self
::
REGEXP_PATTERN
,
$
regex
);
$
this
->
banRegex
(
$
regex
);
}
}
private
function
banRegex
(
string
$
regex
):
void
{
foreach
(
$
this
->
clients
as
$
client
) {
$
client
->
request
(
'
BAN
'
,
''
, [
'
headers
'
=> [
'
ApiPlatform-Ban-Regex
'
=>
$
regex
]]);
}
}
private
function
chunkRegexParts
(
array
$
parts
):
iterable
{
if
(
1
===
\count
(
$
parts
)) {
yield
$
parts
[
0
];
return
;
}
$
concatenatedParts
=
implode
(
"\n"
,
$
parts
);
if
(
\strlen
(
$
concatenatedParts
) <=
$
this
->
maxHeaderLength
) {
yield
str_replace
(
"\n"
,
'
|
'
,
$
concatenatedParts
);
return
;
}
$
lastSeparator
=
strrpos
(
substr
(
$
concatenatedParts
,
0
,
$
this
->
maxHeaderLength
+
1
),
"\n"
);
$
chunk
=
substr
(
$
concatenatedParts
,
0
,
$
lastSeparator
);
yield
str_replace
(
"\n"
,
'
|
'
,
$
chunk
);
$
nextParts
=
\array_slice
(
$
parts
,
substr_count
(
$
chunk
,
"\n"
) +
1
);
yield
from
$
this
->
chunkRegexParts
(
$
nextParts
);
}
}
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