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diff --git a/src/applications/files/conduit/FileUploadChunkConduitAPIMethod.php b/src/applications/files/conduit/FileUploadChunkConduitAPIMethod.php
--- a/src/applications/files/conduit/FileUploadChunkConduitAPIMethod.php
+++ b/src/applications/files/conduit/FileUploadChunkConduitAPIMethod.php
@@ -51,6 +51,16 @@
$start,
$start + $length);
+ // If this is the initial chunk, leave the MIME type unset so we detect
+ // it and can update the parent file. If this is any other chunk, it has
+ // no meaningful MIME type. Provide a default type so we can avoid writing
+ // it to disk to perform MIME type detection.
+ if (!$start) {
+ $mime_type = null;
+ } else {
+ $mime_type = 'application/octet-stream';
+ }
+
// NOTE: These files have a view policy which prevents normal access. They
// are only accessed through the storage engine.
$chunk_data = PhabricatorFile::newFromFileData(
@@ -58,13 +68,26 @@
array(
'name' => $file->getMonogram().'.chunk-'.$chunk->getID(),
'viewPolicy' => PhabricatorPolicies::POLICY_NOONE,
+ 'mime-type' => $mime_type,
));
$chunk->setDataFilePHID($chunk_data->getPHID())->save();
+ $needs_update = false;
+
$missing = $this->loadAnyMissingChunk($viewer, $file);
if (!$missing) {
- $file->setIsPartial(0)->save();
+ $file->setIsPartial(0);
+ $needs_update = true;
+ }
+
+ if (!$start) {
+ $file->setMimeType($chunk_data->getMimeType());
+ $needs_update = true;
+ }
+
+ if ($needs_update) {
+ $file->save();
}
return null;
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
@@ -270,10 +270,8 @@
$file->setByteSize($length);
- // TODO: We might be able to test the first chunk in order to figure
- // this out more reliably, since MIME detection usually examines headers.
- // However, enormous files are probably always either actually raw data
- // or reasonable to treat like raw data.
+ // NOTE: Once we receive the first chunk, we'll detect its MIME type and
+ // update the parent file. This matters for large media files like video.
$file->setMimeType('application/octet-stream');
$chunked_hash = idx($params, 'chunkedHash');

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