From ceaefc2c54f4a5d4528bf2e7ba4607297d2453f4 Mon Sep 17 00:00:00 2001
From: Vincent Petry <pvince81@owncloud.com>
Date: Tue, 16 Feb 2016 12:39:44 +0100
Subject: [PATCH] Defer quota check in web UI when overwriting shared file

When receiving a shared file, the quota for that file counts in the
owner's storage, not the current user's storage.

To make it possible to overwrite the file even when the current user
doesn't have enough space, the quota check is deferred for such files.
---
 apps/files/ajax/upload.php   |  8 +++++--
 apps/files/js/file-upload.js | 43 ++++++++++++++++++++++++++++++------
 2 files changed, 42 insertions(+), 9 deletions(-)

diff --git a/apps/files/ajax/upload.php b/apps/files/ajax/upload.php
index 5bf69d3e30..36aaed5ad9 100644
--- a/apps/files/ajax/upload.php
+++ b/apps/files/ajax/upload.php
@@ -136,8 +136,12 @@ $maxUploadFileSize = $storageStats['uploadMaxFilesize'];
 $maxHumanFileSize = OCP\Util::humanFileSize($maxUploadFileSize);
 
 $totalSize = 0;
-foreach ($files['size'] as $size) {
-	$totalSize += $size;
+$isReceivedShare = \OC::$server->getRequest()->getParam('isReceivedShare', false) === 'true';
+// defer quota check for received shares
+if (!$isReceivedShare) {
+	foreach ($files['size'] as $size) {
+		$totalSize += $size;
+	}
 }
 if ($maxUploadFileSize >= 0 and $totalSize > $maxUploadFileSize) {
 	OCP\JSON::error(array('data' => array('message' => $l->t('Not enough storage available'),
diff --git a/apps/files/js/file-upload.js b/apps/files/js/file-upload.js
index d419cb3a2c..8ba294e2a7 100644
--- a/apps/files/js/file-upload.js
+++ b/apps/files/js/file-upload.js
@@ -251,7 +251,26 @@ OC.Upload = {
 		$('#file_upload_start').trigger(new $.Event('resized'));
 	},
 
+	/**
+	 * Returns whether the given file is known to be a received shared file
+	 *
+	 * @param {Object} file file
+	 * @return {bool} true if the file is a shared file
+	 */
+	_isReceivedSharedFile: function(file) {
+		if (!window.FileList) {
+			return false;
+		}
+		var $tr = window.FileList.findFileEl(file.name);
+		if (!$tr.length) {
+			return false;
+		}
+
+		return ($tr.attr('data-mounttype') === 'shared-root' && $tr.attr('data-mime') !== 'httpd/unix-directory');
+	},
+
 	init: function() {
+		var self = this;
 		if ( $('#file_upload_start').exists() ) {
 			var file_upload_param = {
 				dropZone: $('#content'), // restrict dropZone to content div
@@ -341,10 +360,15 @@ OC.Upload = {
 						}
 					}
 
-					// add size
-					selection.totalBytes += file.size;
-					// update size of biggest file
-					selection.biggestFileBytes = Math.max(selection.biggestFileBytes, file.size);
+					// only count if we're not overwriting an existing shared file
+					if (self._isReceivedSharedFile(file)) {
+						file.isReceivedShare = true;
+					} else {
+						// add size
+						selection.totalBytes += file.size;
+						// update size of biggest file
+						selection.biggestFileBytes = Math.max(selection.biggestFileBytes, file.size);
+					}
 
 					// check PHP upload limit against biggest file
 					if (selection.biggestFileBytes > $('#upload_limit').val()) {
@@ -430,11 +454,16 @@ OC.Upload = {
 						fileDirectory = data.files[0].relativePath;
 					}
 
-					addFormData(data.formData, {
+					var params = {
 						requesttoken: oc_requesttoken,
 						dir: data.targetDir || FileList.getCurrentDirectory(),
-						file_directory: fileDirectory
-					});
+						file_directory: fileDirectory,
+					};
+					if (data.files[0].isReceivedShare) {
+						params.isReceivedShare = true;
+					}
+
+					addFormData(data.formData, params);
 				},
 				fail: function(e, data) {
 					OC.Upload.log('fail', e, data);