manifest = json_decode(
file_get_contents($manifestFile),
true
);
} catch (\Throwable $errorMessage) {
throw new \Exception("Failed loading manifest: $errorMessage");
}
if (!parse_url($baseUri)) {
throw new \Exception("Failed to parse URL: $baseUri");
}
$this->baseUri = $baseUri;
}
/**
* Returns the contents of the manifest file
*
* @return array
*/
public function getManifest(): array
{
return $this->manifest;
}
/**
* Returns the entrypoint from the manifest
*
* @param string $entrypoint
* @param bool $hash
* @return array
*/
public function getEntrypoint(string $entrypoint, bool $hash = true): array
{
return isset($this->manifest[$entrypoint]) ? [
"hash" => $hash ? $this->getFileHash($this->manifest[$entrypoint]["file"]) : null,
"url" => $this->getPath($this->manifest[$entrypoint]["file"])
] : [];
}
/**
* Returns imports for a file listed in the manifest
*
* @param string $entrypoint
* @param bool $hash
* @return array
*/
public function getImports(string $entrypoint, bool $hash = true): array
{
return array_filter(
array_map(function ($import, $hash) {
return isset($this->manifest[$import]["file"]) ? [
"hash" => $hash ? $this->getFileHash($this->manifest[$import]["file"]) : null,
"url" => $this->getPath($this->manifest[$import]["file"])
] : [];
}, $this->manifest[$entrypoint]["imports"], [$hash])
);
}
/**
* Returns stylesheets for a file listed in the manifest
*
* @param string $entrypoint
* @param bool $hash
* @return array
*/
public function getStyles(string $entrypoint, bool $hash = true): array
{
return array_filter(
array_map(function ($style, $hash) {
return isset($style) ? [
"hash" => $hash ? $this->getFileHash($style) : null,
"url" => $this->getPath($style)
] : [];
}, $this->manifest[$entrypoint]["css"], [$hash])
);
}
/**
* Returns SHA-256 hash of file
*
* @param string $file
* @return string
*/
private function getFileHash(string $file): string
{
return "sha256-" . base64_encode(
openssl_digest(
file_get_contents(
$this->getPath($file)
),
"sha256",
true
)
);
}
/**
* Resolves URL for a given file path
*
* @param string $relativePath
* @return string
*/
private function getPath(string $relativePath): string
{
return $this->baseUri . "/" . $relativePath;
}
}