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Wrote REST API usage documentation.

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# REST API
## Introduction
As of Easy!Appointments v1.2 a flexible REST API is integrated within the project that will make it possible to handle all the information of your installations from external clients. The API is using JSON as it's transaction format and features many great practices in order to make the resources easily consumable.
## Making Requests
The new API (v1) supports [Basic Authentication](https://en.wikipedia.org/wiki/Basic_access_authentication) which means that you will have to send the "Authorization" header with every request you make. **Always use SSL/TLS when making requests to a production installation.** That way you can ensure that no passwords will be stolen during the requests. The API expects the username and password of an admin user.
The API follows the REST structure which means that the client can use various HTTP verbs in order to perform various operations to the resources. For example you should use a GET request for fetching resources, a POST for creating new and PUT for updating existing ones in the database. Finally a DELETE request will remove a resource from the system.
GET requests accept some parameter helpers that enable the sort, search, pagination and minification of the responses information. Take a look in the following examples:
### Search
Provide the `q` parameter to perform a search in the resource.
```
http://ea-installation/index.php/api/v1/appointments?q=keyword
```
### Sort
Sort the results in ascending (+) or descending (-) direction by providing the the respective sign and the property name to be used for sorting.
```
http://ea-installation/index.php/api/v1/appointments?sort=-id,+book,-hash
```
You can provide up to three sorting fields which will be applied in the provided order.
### Paginate
Paginate the result by providing the `page` parameter along with the optional `length` parameter that defaults to 20.
```
http://ea-installation/index.php/api/v1/appointments?page=1&length=10
```
### Minimize
If you need to get only specific values from each JSON resource provide the `fields` GET parameter with a list of the required property names.
```
http://ea-installation/index.php/api/v1/appointments?fields=id,book,hash,notes
```
### Try it out!
At this point you can start experimenting with the API and your intallation. The following section of this document describes the available resources and how they can be used. Before building your API consumer you can use [cURL](https://en.wikipedia.org/wiki/CURL) or [Postman](https://chrome.google.com/webstore/detail/postman/fhbjgbiflinjbdggehcddcbncdddomop) to try out the API.
Get all the registered appointments:
```
curl http://ea-installation/index.php/api/v1/appointments --user username:password
```
Get the data of a customer with ID 34:
```
curl http://ea-installation/index.php/api/v1/customers/34 --user username:password
```
Update the name of a category with ID 23:
```
curl -H 'Content-Type: application/json' -X PUT -d '{"name": "New Name!"}' http://ea-installation/index.php/api/v1/categories/23 --user username:password
```
Delete the service with ID 15:
```
curl -X DELETE http://ea-installation/index.php/api/v1/services/15 --user username:password
```
You can also try the GET requests with your browser by navigating to the respecive URLs.
## Resources & URIs
### Appointments
**Resource JSON**
```
{
"id": 1,
"book": "2016-07-08 12:57:00",
"start": "2016-07-08 18:00:00",
"end": "2016-07-08 18:30:00",
"hash": "asdf809a8sdf987a9d8f7",
"notes": "These are some test notes.",
"customerId": 56,
"providerId": 4,
"serviceId": 7,
"googleCalendarId": 134
}
```
- `GET /api/v1/appointments[/:id]` Get all the appointments or a specific one by providing the ID in the URI.
- `POST /api/v1/appointments` Provide the new appointment JSON in the request body to insert a new record.
- `PUT /api/v1/appointments/:id` Provide the updated appointment JSON in the request body to update an existing record. The ID in the URI is required.
- `DELETLE /api/v1/appointments/:id` Remove an existing appointment record.
### Unavailabilities
**Resource JSON**
```
{
"id": 1,
"book": "2016-07-08 12:57:00",
"start": "2016-07-08 18:00:00",
"end": "2016-07-08 18:30:00",
"notes": "These are some test notes.",
"providerId": 4,
"googleCalendarId": 474
}
```
### Customers
**Resource JSON**
```
{
"id": 97,
"firstname": "John",
"lastname": "Doe",
"email": "john@doe.com",
"phone": "0123456789",
"address": "Some Str. 123",
"city": "Some City",
"zip": "12345",
"notes": "Test customer notes."
}
```
- `GET /api/v1/customers[/:id]` Get all the customers or a specific one by providing the ID in the URI.
- `POST /api/v1/customers` Provide the new customer JSON in the request body to insert a new record.
- `PUT /api/v1/customers/:id` Provide the updated customer JSON in the request body to update an existing record. The ID in the URI is required.
- `DELETLE /api/v1/customers/:id` Remove an existing customer record.
### Services
**Resource JSON**
```
{
"id": 74,
"name": "Male Haircut",
"duration": 60,
"price": 10.00,
"currency": "Euro",
"description": "Male haircut trends.",
"categoryId": null
}
```
- `GET /api/v1/services[/:id]` Get all the services or a specific one by providing the ID in the URI.
- `POST /api/v1/services` Provide the new service JSON in the request body to insert a new record.
- `PUT /api/v1/services/:id` Provide the updated service JSON in the request body to update an existing record. The ID in the URI is required.
- `DELETLE /api/v1/services/:id` Remove an existing service record.
### Categories
**Resource JSON**
```
{
"id": 5,
"name": "Test Category",
"description": "This category includes test services"
}
```
- `GET /api/v1/categories[/:id]` Get all the categories or a specific one by providing the ID in the URI.
- `POST /api/v1/categories` Provide the new category JSON in the request body to insert a new record.
- `PUT /api/v1/categories/:id` Provide the updated category JSON in the request body to update an existing record. The ID in the URI is required.
- `DELETLE /api/v1/categories/:id` Remove an existing category record.
### Admins
**Resource JSON**
```
{
"id": 143,
"firstname": "Chris",
"lastname": "Doe",
"email": "chris@doe.com",
"mobile": "012345679-0",
"phone": "0123456789-1",
"address": "Some Str. 123",
"city": "Some City",
"state": "Some City",
"zip": "12345",
"notes": "Test admin notes.",
"settings":{
"username": "chrisdoe",
"notifications": true
}
}
```
- `GET /api/v1/admins[/:id]` Get all the admins or a specific one by providing the ID in the URI.
- `POST /api/v1/admins` Provide the new admin JSON in the request body to insert a new record.
- `PUT /api/v1/admins/:id` Provide the updated admin JSON in the request body to update an existing record. The ID in the URI is required.
- `DELETLE /api/v1/admins/:id` Remove an existing admin record.
### Providers
**Resource JSON**
```
{
"id": 143,
"firstname": "Chloe",
"lastname": "Doe",
"email": "chloe@doe.com",
"mobile": "012345679-0",
"phone": "0123456789-1",
"address": "Some Str. 123",
"city": "Some City",
"state": "Some State",
"zip": "12345",
"notes": "Test provider notes.",
"services": [
1,
5,
9
],
"settings":{
"username": "chloedoe",
"notifications":true,
"googleSync":true,
"googleCalendar": "calendar-id",
"googleToken": "23897dfasdf7a98gas98d9",
"syncFutureDays":10,
"syncPastDays":10,
"workingPlan":{
"monday":{
"start": "09:00",
"end": "18:00",
"breaks":[
{
"start": "14:30",
"end": "15:00"
}
]
},
"tuesday":{
"start": "09:00",
"end": "18:00",
"breaks":[
{
"start": "14:30",
"end": "15:00"
}
]
},
"wednesday":null,
"thursday":{
"start": "09:00",
"end": "18:00",
"breaks":[
{
"start": "14:30",
"end": "15:00"
}
]
},
"friday":{
"start": "09:00",
"end": "18:00",
"breaks":[
{
"start": "14:30",
"end": "15:00"
}
]
},
"saturday":null,
"sunday":null
}
}
}
```
- `GET /api/v1/providers[/:id]` Get all the providers or a specific one by providing the ID in the URI.
- `POST /api/v1/providers` Provide the new provider JSON in the request body to insert a new record.
- `PUT /api/v1/providers/:id` Provide the updated provider JSON in the request body to update an existing record. The ID in the URI is required.
- `DELETLE /api/v1/providers/:id` Remove an existing provider record.
### Secretaries
**Resource JSON**
```
{
"id": 143,
"firstname": "Chris",
"lastname": "Doe",
"email": "chris@doe.com",
"mobile": "012345679-0",
"phone": "0123456789-1",
"address": "Some Str. 123",
"city": "Some City",
"zip": "12345",
"notes": "Test secretary notes.",
"providers": [
53,
17
],
"settings":{
"username":"chrisdoe",
"notifications": true
}
}
```
- `GET /api/v1/secretaries[/:id]` Get all the secretaries or a specific one by providing the ID in the URI.
- `POST /api/v1/secretaries` Provide the new secretary JSON in the request body to insert a new record.
- `PUT /api/v1/secretaries/:id` Provide the updated secretary JSON in the request body to update an existing record. The ID in the URI is required.
- `DELETLE /api/v1/secretaries/:id` Remove an existing secretary record.
### Settings
**Resource JSON**
```
{
"name": "book_advance_timeout",
"value": "100"
}
```
**Requests**
- `GET /api/v1/settings[/:name]` Get all the settings or a specific one by providing the setting name in the URI.
- `PUT /api/v1/settings/:name` Insert or update a setting in the database. Provide a snake_case name in order to keep the conventions.
- `DELETE /api/v1/settings/:name` Remove a setting from the database. **Notice:** Be careful when removing settings that are required by the application because this will cause error later on.
## Troubleshooting
### Authorization Issues
If your server runs PHP through FastCGI you will the authorization will not work because the `Authorization` header is not available to the PHP scripts. You can easily fix this by applying the following adjustments depending your server sortware:
### Apache
Add the following code snippet to an `.htaccess` file in the installation root directory if you have `mod_rewrite` installed and enabled:
```
RewriteEngine on
RewriteRule .* - [E=HTTP_AUTHORIZATION:%{HTTP:Authorization},L]
```
[[Source]](http://stackoverflow.com/a/22554102/1718162)
Add the following code snippet to an `.htaccess` file in the installation root directory if you have `mod_setenvif` installed and enabled:
```
SetEnvIf Authorization .+ HTTP_AUTHORIZATION=$0
```
[[Source]](http://stackoverflow.com/a/27229807/1718162)
### NGINX
Add the following code snippet to the NGINX `.conf` file:
```
fastcgi_param PHP_AUTH_USER $remote_user;
fastcgi_param PHP_AUTH_PW $http_authorization;
```
[[Source]](http://serverfault.com/a/520943)