# Dropshell Template Registry

## Introduction

The DropShell template registry is a very simple C++ webserver 
which provide a store of binary objects (the objects can be large),
which are available over http.

Read access is public.
Write access is controlled by tokens.

- Objects are access via a label and tag, or via their hash. For example:
   - `wget http://dtr.jde.nz/object/squashkiwi:latest`
   - `wget http://dtr.jde.nz/object/4528400792837739857`
- The hash is calculated using `uint64_t hash_file(const std::string &path);` in hash.hpp.
- You can retrieve the hash for a given labvel and tag with, e.g.:
   - `curl http://dtr.jde.nz/hash/squashkiwi:latest`
- you can get a full list of {label:tag,hash} entries (one tag per entry) with:
   - `curl http://dtr.jde.nz/dir`
- a simple welcome page is served at `/index.html` for those browsing to the site.
- to upload a file (via http put)
   - `curl -T object_file http://dtr.jde.nz/WRITE_TOKEN/LABEL:TAG`
   - the object_file is uploaded, hashed, added to the registry (if that hash doesn't already exist), and {label:tag,hash} is added to the directory index.
- the server is configured via a configuration file which allows setting:
   - the list of write access tokens
   - the location for the object store (path on disk)

The C++ program is written so that it only uses standard libraries, and is built as a static executable with musl not glibc.

The C++ program is built with cmake.

A Dockerfile is included for conveniently running the C++ program inside docker.