first basic api docs

source/packages/edutap_wallet_google.md

@@ -1,7 +1,135 @@
 # Package `edutap.wallet_google`
 
+## Overview
+
+This package provides a Python API to interact with the Google Wallet Restful API
+
+It contains:
+
+- an API to
+   - create,
+   - read,
+   - update,
+   - disable,
+   - list
+  wallet classes and objects
+  and
+  - issue passes.
+- Pydantic models of the classes, objects, and their (nested) primitives.
+- An extensible registry for models of classes and objects.
+- A session manager for authorized HTTPS communication with the Google Restful API.
+
+## Installation
+
+The package can be installed using `pip install edutap.wallet_google`.
+
+## Configuration
+
+To authenticate with the Google API, you need to provide a credentials file.
+It is expected in the filesystem, readable by the program.
+Point the environment variable `EDUTAP_WALLET_GOOGLE_CREDENTIALS_FILE` to its location.
+
+Example:
+
+```bash
+export EDUTAP_WALLET_GOOGLE_CREDENTIALS_FILE=/home/example/google_credential_file.json
+```
+
 ```{todo}
 
-Write `edutap.wallet_google` docs
+Find the page at Google which describes how to get the file.
+
+```
+
+You also need to know the issuer identifer.
+
+## Usage
+
+All one need to do is to import the `api` module:
+
+```python
+from edutap.wallet_google import api
+```
+
+The `api`` module has the functions:
+
+- `api.create`
+- `api.read`
+- `api.update`
+- `api.disable`
+- `api.message`
+- `api.listing`
+- `api.save_link`
+
+To tell the API functions what kind of item to deal with, the first parameter is the registered name of the model (except for `save_link`).
+
+Models can be the different wallet-classes or -objects, but also issuers, permissions and such (see section models below).
+
+Here a very basic example
+- to create a pass template of type `GenericClass`,
+- create a pass of type `GenericObject` using the prior created class and then
+- create a save link to download it to the phones wallet:
+
+```python
+from edutap.wallet_google import api
+
+# ensure the EDUTAP_WALLET_GOOGLE_CREDENTIALS_FILE environment variable is set!
+
+new_class = api.create(
+    "GenericClass",
+    {
+        # ids are always consisting of the issuer id as a prefix followed
+        # by a postfix, delimited by a dot.
+        "id": "1234567890123456789.exampleclass01.edutap",
+    },
+)
+
+new_object = api.create(
+    "GenericObject",
+    {
+        "id": "1234567890123456789.exampleobject01.edutap"
+        "classId": "1234567890123456789.exampleclass01.edutap",
+        "cardTitle": {
+            "defaultValue": {
+                "language": "en",
+                "value": "Example Pass 01"
+            },
+            "translatedValues": []
+        },
+        "header": {
+            "defaultValue": {
+                "language": "en",
+                "value": "This is an example pass."
+            },
+            "translatedValues": []
+        },
+        "state": "ACTIVE"
+    },
+)
+
+new_link = api.save_link(
+    {"id": "1234567890123456789.exampleobject01.edutap"},
+    origins=["https://example.com"],
+)
+```
+
+## Models
+
+### Top Level Models
+
+### Datatypes and Enums
+
+```{todo}
+
+Create a Sphinx plugin to document the pydantic models of `edutap.wallet_google`.
+
+```
+
+## API Documentation
+
+```{todo}
+
+Use Sphinx autodoc to document the functions and classes of modules `edutap.wallet_google`.
+
+```
 
-```