mod_http_file_share: Support download resumption via Range requests
Only a starting point is supported due to the way response:send_file()
sends everything it gets from the provided file handle but does not have
any way to specify how much to read.
This matches what Conversations appears to be doing.
--- a/doc/doap.xml Wed May 12 01:11:42 2021 +0200
+++ b/doc/doap.xml Sun May 16 16:52:59 2021 +0200
@@ -52,6 +52,7 @@
<implements rdf:resource="https://www.rfc-editor.org/info/rfc6121"/>
<implements rdf:resource="https://www.rfc-editor.org/info/rfc6122"/>
<implements rdf:resource="https://www.rfc-editor.org/info/rfc6455"/>
+ <implements rdf:resource="https://www.rfc-editor.org/info/rfc7233"/>
<implements rdf:resource="https://www.rfc-editor.org/info/rfc7301"/>
<implements rdf:resource="https://www.rfc-editor.org/info/rfc7395"/>
<implements rdf:resource="https://www.rfc-editor.org/info/rfc7590"/>
--- a/plugins/mod_http_file_share.lua Wed May 12 01:11:42 2021 +0200
+++ b/plugins/mod_http_file_share.lua Sun May 16 16:52:59 2021 +0200
@@ -356,6 +356,20 @@
return 410;
end
+ local request_range = request.headers.range;
+ local response_range;
+ if request_range then
+ local range_start, range_end = request_range:match("^bytes=(%d+)%-(%d*)$")
+ -- Only support resumption, ie ranges from somewhere in the middle until the end of the file.
+ if (range_start and range_start ~= "0" and range_start ~= filesize) and (range_end == "" or range_end == filesize) then
+ if handle:seek("set", tonumber(range_start)) then
+ response_range = "bytes "..range_start.."-"..filesize.."/"..filesize;
+ filesize = string.format("%d", tonumber(filesize)-tonumber(range_start));
+ end
+ end
+ end
+
+
if not filetype then
filetype = "application/octet-stream";
end
@@ -369,6 +383,12 @@
response.headers.content_type = filetype;
response.headers.content_disposition = string.format("%s; filename=%q", disposition, basename);
+ if response_range then
+ response.status_code = 206;
+ response.headers.content_range = response_range;
+ end
+ response.headers.accept_ranges = "bytes";
+
response.headers.cache_control = "max-age=31556952, immutable";
response.headers.content_security_policy = "default-src 'none'; frame-ancestors 'none';"
response.headers.strict_transport_security = "max-age=31556952";