Files.app: Add an private API to get a download URL

chrome/browser/chromeos/drive/file_system.cc

Index: chrome/browser/chromeos/drive/file_system.cc
diff --git a/chrome/browser/chromeos/drive/file_system.cc b/chrome/browser/chromeos/drive/file_system.cc
index 3665383d7290dd1fdeb6b8635e7ede6a08e25e78..244b3428fbf2192f3aed41e3b8846053c530e590 100644
--- a/chrome/browser/chromeos/drive/file_system.cc
+++ b/chrome/browser/chromeos/drive/file_system.cc
@@ -693,7 +693,7 @@ void FileSystem::OnGetAboutResource(
 
 void FileSystem::GetShareUrl(const base::FilePath& file_path,
                              const GURL& embed_origin,
-                             const GetShareUrlCallback& callback) {
+                             const GetUrlCallback& callback) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   DCHECK(!callback.is_null());
 
@@ -717,7 +717,7 @@ void FileSystem::GetShareUrl(const base::FilePath& file_path,
 void FileSystem::GetShareUrlAfterGetResourceEntry(
     const base::FilePath& file_path,
     const GURL& embed_origin,
-    const GetShareUrlCallback& callback,
+    const GetUrlCallback& callback,
     ResourceEntry* entry,
     FileError error) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
@@ -743,7 +743,7 @@ void FileSystem::GetShareUrlAfterGetResourceEntry(
 }
 
 void FileSystem::OnGetResourceEntryForGetShareUrl(
-    const GetShareUrlCallback& callback,
+    const GetUrlCallback& callback,
     google_apis::GDataErrorCode status,
     const GURL& share_url) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
@@ -763,6 +763,73 @@ void FileSystem::OnGetResourceEntryForGetShareUrl(
   callback.Run(FILE_ERROR_OK, share_url);
 }
 
+void FileSystem::GetDownloadUrl(const base::FilePath& file_path,
+                                const GetUrlCallback& callback) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+  DCHECK(!callback.is_null());
+
+  // Resolve the resource id.
+  ResourceEntry* entry = new ResourceEntry;
+  base::PostTaskAndReplyWithResult(
+      blocking_task_runner_.get(),
+      FROM_HERE,
+      base::Bind(&internal::ResourceMetadata::GetResourceEntryByPath,
+                 base::Unretained(resource_metadata_),
+                 file_path,
+                 entry),
+      base::Bind(&FileSystem::GetDownloadUrlAfterGetResourceEntry,
+                 weak_ptr_factory_.GetWeakPtr(),
+                 file_path,
+                 callback,
+                 base::Owned(entry)));
+}
+
+void FileSystem::GetDownloadUrlAfterGetResourceEntry(
+    const base::FilePath& file_path,
+    const GetUrlCallback& callback,
+    ResourceEntry* entry,
+    FileError error) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+  DCHECK(!callback.is_null());
+
+  if (error != FILE_ERROR_OK) {
+    callback.Run(error, GURL());
+    return;
+  }
+  if (entry->resource_id().empty()) {
+    // This entry does not exist on the server. Just return.
+    callback.Run(FILE_ERROR_FAILED, GURL());
+    return;
+  }
+
+  scheduler_->GetFileResource(
+      entry->resource_id(),
+      base::Bind(&FileSystem::OnGetFileResourceForGetDownloadUrl,
+                 weak_ptr_factory_.GetWeakPtr(),
+                 callback));
+}
+
+void FileSystem::OnGetFileResourceForGetDownloadUrl(
+    const GetUrlCallback& callback,
+    google_apis::GDataErrorCode status,
+    scoped_ptr<google_apis::FileResource> file_resource) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+  DCHECK(!callback.is_null());
+
+  FileError error = GDataToFileError(status);
+  if (error != FILE_ERROR_OK) {
+    callback.Run(error, GURL());
+    return;
+  }
+
+  if (file_resource->download_url().is_empty()) {
+    callback.Run(FILE_ERROR_FAILED, GURL());
+    return;
+  }
+
+  callback.Run(FILE_ERROR_OK, file_resource->download_url());
+}
+
 void FileSystem::Search(const std::string& search_query,
                         const GURL& next_link,
                         const SearchCallback& callback) {