ARI: Add the ability to download the media associated with a stored recording

This patch adds a new feature to ARI that allows a client to download
the media associated with a stored recording. The new route is
/recordings/stored/{name}/file, and transmits the underlying binary file
using Asterisk's HTTP server's underlying file transfer facilities.

Because this REST route returns non-JSON, a few small enhancements had
to be made to the Python Swagger generation code, as well as the
mustache templates that generate the ARI bindings.

ASTERISK-26042 #close

Change-Id: I49ec5c4afdec30bb665d9c977ab423b5387e0181

2 files changed, 58 insertions, 0 deletions

diff --git a/res/ari/resource_recordings.c b/res/ari/resource_recordings.c
index a49c3b12e..5661d608d 100644
--- a/res/ari/resource_recordings.c
+++ b/res/ari/resource_recordings.c
@@ -101,6 +101,50 @@ void ast_ari_recordings_get_stored(struct ast_variable *headers,
 	ast_ari_response_ok(response, json);
 }
 
+void ast_ari_recordings_get_stored_file(struct ast_tcptls_session_instance *ser,
+	struct ast_variable *headers, struct ast_ari_recordings_get_stored_file_args *args,
+	struct ast_ari_response *response)
+{
+	RAII_VAR(struct stasis_app_stored_recording *, recording,
+		stasis_app_stored_recording_find_by_name(args->recording_name),
+		ao2_cleanup);
+	static const char *format_type_names[AST_MEDIA_TYPE_TEXT + 1] = {
+		[AST_MEDIA_TYPE_UNKNOWN] = "binary",
+		[AST_MEDIA_TYPE_AUDIO] = "audio",
+		[AST_MEDIA_TYPE_VIDEO] = "video",
+		[AST_MEDIA_TYPE_IMAGE] = "image",
+		[AST_MEDIA_TYPE_TEXT] = "text",
+	};
+	struct ast_format *format;
+
+	response->message = ast_json_null();
+
+	if (!recording) {
+		ast_ari_response_error(response, 404, "Not Found",
+			"Recording not found");
+		return;
+	}
+
+	format = ast_get_format_for_file_ext(stasis_app_stored_recording_get_extension(recording));
+	if (!format) {
+		ast_ari_response_error(response, 500, "Internal Server Error",
+			"Format specified by recording not available or loaded");
+		return;
+	}
+
+	response->fd = open(stasis_app_stored_recording_get_filename(recording), O_RDONLY);
+	if (response->fd < 0) {
+		ast_ari_response_error(response, 403, "Forbidden",
+			"Recording could not be opened");
+		return;
+	}
+
+	ast_str_append(&response->headers, 0, "Content-Type: %s/%s\r\n",
+		format_type_names[ast_format_get_type(format)],
+		stasis_app_stored_recording_get_extension(recording));
+	ast_ari_response_ok(response, ast_json_null());
+}
+
 void ast_ari_recordings_copy_stored(struct ast_variable *headers,
 	struct ast_ari_recordings_copy_stored_args *args,
 	struct ast_ari_response *response)
diff --git a/res/ari/resource_recordings.h b/res/ari/resource_recordings.h
index 196122f44..1bc93c527 100644
--- a/res/ari/resource_recordings.h
+++ b/res/ari/resource_recordings.h
@@ -76,6 +76,20 @@ struct ast_ari_recordings_delete_stored_args {
  * \param[out] response HTTP response
  */
 void ast_ari_recordings_delete_stored(struct ast_variable *headers, struct ast_ari_recordings_delete_stored_args *args, struct ast_ari_response *response);
+/*! Argument struct for ast_ari_recordings_get_stored_file() */
+struct ast_ari_recordings_get_stored_file_args {
+	/*! The name of the recording */
+	const char *recording_name;
+};
+/*!
+ * \brief Get the file associated with the stored recording.
+ *
+ * \param ser TCP/TLS session instance
+ * \param headers HTTP headers
+ * \param args Swagger parameters
+ * \param[out] response HTTP response
+ */
+void ast_ari_recordings_get_stored_file(struct ast_tcptls_session_instance *ser, struct ast_variable *headers, struct ast_ari_recordings_get_stored_file_args *args, struct ast_ari_response *response);
 /*! Argument struct for ast_ari_recordings_copy_stored() */
 struct ast_ari_recordings_copy_stored_args {
 	/*! The name of the recording to copy */