# Subhub

An _experimental_ (Read: not-usable or in anyway done) distributed/federated podcasting platform based on [ActivityPub.](https://raw.githubusercontent.com/w3c/activitypub/gh-pages/activitypub-tutorial.txt)

## Usage

Getting started:

Ensure that you're using go11 with go-modules turned on.

```sh
export GO111MODULE=on # Put this in your .zshrc or .bash_profile or whatnot
```

Clone/Download the project with:

```sh
go get git.macaw.me/inhosin/subhub
```

Building a binary with make (or [mmake](https://github.com/tj/mmake) if you're fancy):

```sh
make
```

Building and then running that binary:

```sh
make run
```

Running tests:

```sh
make test
```

Setting up your database (this works best if you have postgres already [running locally](https://postgresapp.com/)):

```sh
make database
```

Creating a new migration in `db/migrations`:

```sh
make migration NAME=some_name_here
```

## Learning about ActivityPub

![explaination](https://i.imgur.com/ShgecWe.png)

### Basic Description

ActivityPub gives every user (or `actor` in it's vocab) on a server an "inbox" and an "outbox". But these are really just endpoints:

```
https://myactpub.site/activity/user/flaque/inbox
https://myactpub.site/activity/user/flaque/outbox
```

ActivityPub asks that you accept `GET` and `POST` requests to these endpoints where a `POST` tells a the server to put that in a user's queue or feed and `GET` lets the user retrieve info from the feed.

You send messages called `ActivityStreams` that are really just a special spec of JSON:

```json
{"@context": "https://www.w3.org/ns/activitystreams",
 "type": "Create",
 "id": "https://social.example/alyssa/posts/a29a6843-9feb-4c74-a7f7-081b9c9201d3",
 "to": ["https://chatty.example/ben/"],
 "author": "https://social.example/alyssa/",
 "object": {"type": "Note",
            "id": "https://social.example/alyssa/posts/49e2d03d-b53a-4c4c-a95c-94a6abf45a19",
            "attributedTo": "https://social.example/alyssa/",
            "to": ["https://chatty.example/ben/"],
            "content": "Say, did you finish reading that book I lent you?"}
```

#### Objects, Actors, and Activities

(**Note:** Pubcast uses a slightly different internal naming than ActivityPub. To have more understandable code in the context of podcasts, ActivityPub's `Organization` actor type is a `Show` inside Pubcast. Additionally, the `Object` type is a Pubcast `Episode`.)

ActivityPub is based on [a formalized vocabulary](https://www.w3.org/TR/activitystreams-vocabulary/) of data types, actions and folks doing the actions.

An `Object` is a generic data type written in JSON:

```json
{
  "@context": "https://www.w3.org/ns/activitystreams",
  "type": "Object",
  "id": "http://www.test.example/object/1",
  "name": "A Simple, non-specific object"
}
```

Objects have [a set collection of formalized properties](https://www.w3.org/TR/activitystreams-vocabulary/#properties) such as `id`, `name`, `url`, etc but you technically can create your own. Objects serve as a base type for other Activity Steam's core set of types.

For example, there are a set of [actor types](https://www.w3.org/TR/activitystreams-vocabulary/#actor-types) that themselves are `Objects`.

```json
/* A "Person" actor type */
{
  "@context": "https://www.w3.org/ns/activitystreams",
  "type": "Person",
  "name": "Sally Smith"
}
```

[Activities](https://www.w3.org/TR/activitystreams-vocabulary/#h-activity-types) are also subtypes of `Object`, and are used to describe relationships between objects. Some examples of activities include:

- Accept
- Create
- Move
- Question
- Undo
- Follow
- View

An `Activity` json might look something like this:

```json
{
  "@context": "https://www.w3.org/ns/activitystreams",
  "summary": status,
  "type": "Create",
  "actor": {
    "type": "Person",
    "name": "Sally"
  },
  "object": {
    "type": "Note",
    "name": "A Simple Note",
    "content": status
  }
}
```

### Links

- [ActivityPub tutorial](https://raw.githubusercontent.com/w3c/activitypub/gh-pages/activitypub-tutorial.txt)
- [ActivityPub.rocks explaination](https://activitypub.rocks/)
- [W3 ActivityPub Spec](https://www.w3.org/TR/activitypub/)
- [W3 ActivityPub Vocabulary Spec](https://www.w3.org/TR/activitystreams-vocabulary/)
- [Other Golang implementations of this spec](https://github.com/go-fed/activity#who-is-using-this-library-currently)

## Design

### Hub Object