D17620.diff
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	diff --git a/src/applications/files/storage/PhabricatorFile.php b/src/applications/files/storage/PhabricatorFile.php
	--- a/src/applications/files/storage/PhabricatorFile.php
	+++ b/src/applications/files/storage/PhabricatorFile.php
	@@ -94,7 +94,7 @@
	'storageHandle' => 'text255',
	'authorPHID' => 'phid?',
	'secretKey' => 'bytes20?',
	- 'contentHash' => 'bytes40?',
	+ 'contentHash' => 'bytes64?',
	'ttl' => 'epoch?',
	'isExplicitUpload' => 'bool?',
	'mailKey' => 'bytes20',
	@@ -718,7 +718,17 @@
	}

	public static function hashFileContent($data) {
	- return null;
	+ // NOTE: Hashing can fail if the algorithm isn't available in the current
	+ // build of PHP. It's fine if we're unable to generate a content hash:
	+ // it just means we'll store extra data when users upload duplicate files
	+ // instead of being able to deduplicate it.
	+
	+ $hash = hash('sha256', $data, $raw_output = false);
	+ if ($hash === false) {
	+ return null;
	+ }
	+
	+ return $hash;
	}

	public function loadFileData() {