title: API Conventions
Each sr.ht API follows the same set of design conventions throughout. Each API
is RESTful, authenticated with [meta.sr.ht](meta.sr.ht), and has consistent
standards for pagination, response codes, and so on, throughout.
## API Wrappers
API wrappers for a few programming languages exist:
- [CHICKEN Scheme](https://git.sr.ht/~evhan/topham)
Please write to [sr.ht-discuss](https://lists.sr.ht/~sircmpwn/sr.ht-discuss) to
All services are authenticated with OAuth via meta.sr.ht. For more information,
consult [the meta.sr.ht OAuth documentation](meta.sr.ht/oauth-api.md).
The basic routing model is:
List of `:resources`, e.g. `/api/repos`
- **GET**: retrieve the list
- **POST**: create a new resource
Manipulate a specific `:resource` by `:id`.
- **GET**: retrieve the resource
- **PUT**: modify the resource
- **DELETE**: destroy the resource
List of `:subresources` which are children of `:resource`.
A singleton which is owned by `:resource`.
A named action to be completed asyncronously.
Manipulate a specific `:resource` by `:id`. See `/api/:resource/:id`.
- The `:id` may be an integer or string
## Request & response format
All requests and response bodies shall be encoded with Content-Type
### Resource schemas
Each resource returned by the API has its own schema, and may be given in two
forms: *full form* and *short form*. The full form is always returned when
retrieving a resource by ID, and contains the maximum amount of detail. The
short form contains less information - an ID at the minimum, but often more -
and is returned where the long form would be inconvenient, such as from a list
endpoint or for singletons embedded in a parent resource.
Timestamps are encoded as strings using the format `%Y-%m-%dT%H:%M:%S`.
When executing a `GET` request on a list of resources, the response format is:
"results": [ :resources... ],
To retrieve the next page of results, add `?start=:id` to your request URL,
using the `:id` given by `"next"`.
## Response codes
The use of HTTP response codes is standardized throughout sourcehut.
- **200**: Resource(s) found
- **201**: Resource(s) created
- **202**: Your request has been accepted and is processing
- **204**: Used when resource(s) are successfully deleted
- **400**: Your request is invalid (missing required fields?)
- **401**: You're missing the (or have an invalid) Authorization header
- **403**: You're not allowed to do what you're attempting
- **404**: Resource(s) not found
- **5xx**: Something broke on our end
### Error responses
Errors are returned with a consistent response body:
"reason": "example is requried"
`"field"` is omitted when it is not applicable.
## Standard endpoints
### GET /api/version
Returns the API version installed for this service. Sourcehut uses semantic
versioning, each version being of the format "major.minor.patch". The patch
number increments with every release, the minor number increments when new
features are added, and the major version increments on breaking changes. Note
that the minor and patch versions may increment when changes are made to the web
frontend - which may not necessarily affect the API - but major versions only
increment on breaking API changes. Any API whose major version is 0 makes no
guarantees about interface stability.
Changes considered non-breaking are adding new API endpoints and resources,
adding members to existing resources, adding members to enumerations, and adding
optional fields to existing requests.
## Standard resources
### User resource
"url": "url" or null,
"location": "location" or null,
"bio": "bio" or null
Most resources will have webhooks which can deliver updates to your application
via HTTP POST. You'll able to subscribe to some number of events, such as (on
meta.sr.ht) `profile:update` or `ssh-key:remove`. These require the same OAuth
scopes to configure as are necessary to obtain these resources through polling -
there's no separate OAuth scope for webhooks.
Periodically polling the API is discouraged - use webhooks instead.
### Webhook delivery
When the events you've subscribed to occur, the notification will be delivered
to your URL as an HTTP POST, generally in the same format as the affected
resource is encoded via the API. `X-Webhook-Delivery` is set to a UUID assigned
to that webhook delivery, and `X-Webhook-Event` is set to the specific event
that occurred, e.g. `profile:update`.
### Webhook signatures
The `X-Payload-Signature` and `X-Payload-Nonce` headers can be used to verify
the authenticity of the webhook payload. Concatenate the request body with the
nonce (treat the nonce as an ASCII-encoded string) and use it to verify the
base64-encoded Ed25519 siganture given by the `X-Payload-Signature` header. The
public key (also base64 encoded) is
`uX7KWyyDNMaBma4aVbJ/cbUQpdjqczuCyK/HxzV/u+4=`. Here's an example of verifying
the payload in Python:
from cryptography.hazmat.primitives.asymmetric.ed25519 import Ed25519PublicKey
public_key = Ed25519PublicKey.from_public_bytes(
payload = request.data
signature = headers["X-Payload-Signature"]
signature = base64.b64decode(signature)
nonce = headers["X-Payload-Nonce"].encode()
public_key.verify(signature, payload + nonce)
### Subscription resource
"events": ["event", ...],
"url": "subscription URL"
### Delivery resource
"url": "subscription URL",
"payload": "request body",
"payload_headers": "request headers",
"response": "response body",
"response_headers": "response headers"
- **response_status** is -2 prior to delivery, and -1 if delivery failed.
### POST /api/.../webhooks
"events": ["profile:update", "ssh-key:remove"]
- **url**: the URL that should have webhook deliveries issued to it
- **events**: the list of events this subscription should include
The new [subscription resource](#subscription-resource).
### GET /api/.../webhooks
List of [subscription resources](#subscription-resource).
### GET /api/.../webhooks/:id
Retrieves a [subscription resource](#subscription-resource).
### GET /api/.../webhooks/:id/deliveries
List of [delivery resources](#delivery-resource) for this subscription.
### GET /api/.../webhooks/:id/deliveries/:id
Retrieves a [delivery resource](#delivery-resource) by UUID.