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https://github.com/pubcast/pubcast
An experimental ActivityPub based podcasting platform.
https://github.com/pubcast/pubcast
activitypub fediverse golang podcasts
Last synced: 24 days ago
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An experimental ActivityPub based podcasting platform.
- Host: GitHub
- URL: https://github.com/pubcast/pubcast
- Owner: pubcast
- License: mpl-2.0
- Created: 2018-09-25T21:14:40.000Z (about 6 years ago)
- Default Branch: master
- Last Pushed: 2019-03-07T02:41:30.000Z (over 5 years ago)
- Last Synced: 2024-06-09T06:21:03.625Z (5 months ago)
- Topics: activitypub, fediverse, golang, podcasts
- Language: Go
- Homepage: https://pubcast.pub/
- Size: 2.03 MB
- Stars: 111
- Watchers: 13
- Forks: 5
- Open Issues: 8
-
Metadata Files:
- Readme: README.md
- License: LICENSE
Awesome Lists containing this project
README
# 🎙 Pubcast
[](https://gitter.im/metapodcasts)
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 github.com/pubcast/pubcast
```
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
### 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": "Sally created a note",
"type": "Create",
"actor": {
"type": "Person",
"name": "Sally"
},
"object": {
"type": "Note",
"name": "A Simple Note",
"content": "This is a simple note"
}
}
```
### 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
### Podcast Object
Podcasts include four main pieces of information: the `header` info, the `shownotes`, the `preview`, and the `audio`. A Header includes the title and date of the show. Shownotes are a collection of info about the show; they're basically an HTML supported description. A preview is an image thumbnail for the show. Audio is the actual stuff you're listening to.
A Podcast ActivityStream Object can therefore look something like this:
```json
"object" : {
"id": "https://example.org/activity/organization/npr/planet-money",
"type": "Podcast",
"name": "This American Life",
"date": "2008-09-15T15:53:00",
"shownotes": "Check out our website!",
"preview": {
"type": "Image",
"href": "http://example.org/album/máiréad.jpg",
"mediaType": "image/jpeg"
},
"audio": {
"type": "Audio",
"href": "https://example.org/activity/organization/npr/planet-money/episodes/1.mp4",
"mediaType": "audio/mp4"
}
}
```