Added projects endpoint docs, error status codes, token expiration description

slate/source/includes/reference/_authentication.md

@@ -2,6 +2,8 @@
 
 ## Authentication
 
+### Authentication Basics
+
 > Get authentication token:
 
 ```bash
@@ -42,6 +44,13 @@ Header |
 ------ |
 Authorization: JWT `your_token` |
 
-The token expires after a set amount of time. The expiration time is dependent on WebODM's settings. You will need to request another token when a token expires.
+The token expires after a set amount of time. See [Token Expiration](#token-expiration) for more information.
 
 Since applications sometimes do not allow headers to be modified, you can also authenticate by appending the `jwt` querystring parameter to a protected URL. This is less secure, so pass the token via header if possible.
+
+
+### Token Expiration
+
+The token expires after a set amount of time. The expiration time is dependent on WebODM's settings. You will need to request another token when a token expires.
+
+You know that a token has expired if any call to an API returns a `403` status code with the JSON body `{'detail': 'Signature has expired.'}`.

slate/source/includes/reference/_handlingerrors.md

@@ -0,0 +1,16 @@
+## Handling Errors
+
+All API calls use the status codes as described in the [Django REST Framework's Status Code Guide](http://www.django-rest-framework.org/api-guide/status-codes/), but generally you only need to check for success status code (status code `200` or `204`) and handle the special case of [Token Expiration](#token-expiration) (status code `403`) and report an error otherwise.
+
+### Error Status Codes
+
+This is not an exhaustive list, but common error codes are listed below. 
+
+Status Code | Description
+----------- | -----------
+401 | Unauthenticated
+403 | Forbidden (token expired?)
+400 | Malformed request
+404 | Not found
+
+For security reasons, sometimes an operation which should return `403` returns `404` to avoid disclosing IDs and other information from attackers.

slate/source/includes/reference/_project.md

@@ -57,6 +57,9 @@ Parameters are the same as above.
 
 Upon deletion, all [Task](#task) items associated with the [Project](#project) are deleted also. The operation is irreversible.
 
+### Get single project
+
+`GET /api/projects/{id}/`
 
 ### Get list of projects
 

slate/source/index.html.md

@@ -19,6 +19,7 @@ includes:
  - reference/task
  - reference/processingnode
  - reference/permissions
+ - reference/handlingerrors
  - fordevelopers
 
 ---