Migrate "cancdn" to "canCDN" in the database

Summary: Ref T5884. We migrated with "canCDN" and then had live writes with "cancdn". Move everything to "canCDN" for consistency.

Test Plan: Ran migration, verified DB only has "canCDN" afterward.

Reviewers: btrahan

Reviewed By: btrahan

Subscribers: epriestley

Maniphest Tasks: T5884

Differential Revision: https://secure.phabricator.com/D10273

resources/sql/autopatches/20140815.cancdncase.php

@@ -0,0 +1,24 @@
+<?php
+
+// This corrects files which incorrectly had a 'cancdn' property written;
+// the property should be 'canCDN'.
+
+$table = new PhabricatorFile();
+$conn_w = $table->establishConnection('w');
+foreach (new LiskMigrationIterator($table) as $file) {
+  $id = $file->getID();
+  echo "Updating capitalization of canCDN property for file {$id}...\n";
+  $meta = $file->getMetadata();
+
+  if (isset($meta['cancdn'])) {
+    $meta['canCDN'] = $meta['cancdn'];
+    unset($meta['cancdn']);
+
+    queryfx(
+      $conn_w,
+      'UPDATE %T SET metadata = %s WHERE id = %d',
+      $table->getTableName(),
+      json_encode($meta),
+      $id);
+  }
+}

src/applications/files/storage/PhabricatorFile.php

@@ -849,11 +849,6 @@ final class PhabricatorFile extends PhabricatorFileDAO
       return false;
     }
 
-    // TODO: Migrate away this old constant and remove this check.
-    if (idx($this->metadata, 'cancdn')) {
-      return true;
-    }
-
     return idx($this->metadata, self::METADATA_CAN_CDN);
   }