Chapter 115. Google Calendar Component
Available as of Camel version 2.15
The Google Calendar component provides access to http://google.com/calendar[Google Calendar] via the https://developers.google.com/google-apps/calendar/v3/reference/[Google Calendar Web APIs].
Google Calendar uses the https://developers.google.com/accounts/docs/OAuth2[OAuth 2.0 protocol] for authenticating a Google account and authorizing access to user data. Before you can use this component, you will need to https://developers.google.com/google-apps/calendar/auth[create an account and generate OAuth credentials]. Credentials comprise of a clientId, clientSecret, and a refreshToken. A handy resource for generating a long-lived refreshToken is the https://developers.google.com/oauthplayground[OAuth playground].
Maven users will need to add the following dependency to their pom.xml for this component:
<dependency>
<groupId>org.apache.camel</groupId>
<artifactId>camel-google-calendar</artifactId>
<version>2.15.0</version>
</dependency>115.1. 1. Google Calendar Options
The Google Calendar component supports 3 options which are listed below.
| Name | Description | Default | Type |
|---|---|---|---|
| configuration (common) | To use the shared configuration | GoogleCalendar Configuration | |
| clientFactory (advanced) | To use the GoogleCalendarClientFactory as factory for creating the client. Will by default use BatchGoogleCalendarClientFactory | GoogleCalendarClient Factory | |
| resolveProperty Placeholders (advanced) | Whether the component should resolve property placeholders on itself when starting. Only properties which are of String type can use property placeholders. | true | boolean |
The Google Calendar endpoint is configured using URI syntax:
google-calendar:apiName/methodName
with the following path and query parameters:
115.1.1. Path Parameters (2 parameters):
| Name | Description | Default | Type |
|---|---|---|---|
| apiName | Required What kind of operation to perform | GoogleCalendarApiName | |
| methodName | Required What sub operation to use for the selected operation | String |
115.1.2. Query Parameters (14 parameters):
| Name | Description | Default | Type |
|---|---|---|---|
| accessToken (common) | OAuth 2 access token. This typically expires after an hour so refreshToken is recommended for long term usage. | String | |
| applicationName (common) | Google calendar application name. Example would be camel-google-calendar/1.0 | String | |
| clientId (common) | Client ID of the calendar application | String | |
| clientSecret (common) | Client secret of the calendar application | String | |
| emailAddress (common) | The emailAddress of the Google Service Account. | String | |
| inBody (common) | Sets the name of a parameter to be passed in the exchange In Body | String | |
| p12FileName (common) | The name of the p12 file which has the private key to use with the Google Service Account. | String | |
| refreshToken (common) | OAuth 2 refresh token. Using this, the Google Calendar component can obtain a new accessToken whenever the current one expires - a necessity if the application is long-lived. | String | |
| scopes (common) | Specifies the level of permissions you want a calendar application to have to a user account. You can separate multiple scopes by comma. See https://developers.google.com/google-apps/calendar/auth for more info. | String | |
| user (common) | The email address of the user the application is trying to impersonate in the service account flow | String | |
| bridgeErrorHandler (consumer) | Allows for bridging the consumer to the Camel routing Error Handler, which mean any exceptions occurred while the consumer is trying to pickup incoming messages, or the likes, will now be processed as a message and handled by the routing Error Handler. By default the consumer will use the org.apache.camel.spi.ExceptionHandler to deal with exceptions, that will be logged at WARN or ERROR level and ignored. | false | boolean |
| exceptionHandler (consumer) | To let the consumer use a custom ExceptionHandler. Notice if the option bridgeErrorHandler is enabled then this options is not in use. By default the consumer will deal with exceptions, that will be logged at WARN or ERROR level and ignored. | ExceptionHandler | |
| exchangePattern (consumer) | Sets the exchange pattern when the consumer creates an exchange. | ExchangePattern | |
| synchronous (advanced) | Sets whether synchronous processing should be strictly used, or Camel is allowed to use asynchronous processing (if supported). | false | boolean |
115.2. URI Format
The GoogleCalendar Component uses the following URI format:
google-calendar://endpoint-prefix/endpoint?[options]
Endpoint prefix can be one of:
- acl
- calendars
- channels
- colors
- events
- freebusy
- list
- settings
115.3. Producer Endpoints
Producer endpoints can use endpoint prefixes followed by endpoint names and associated options described next. A shorthand alias can be used for some endpoints. The endpoint URI MUST contain a prefix.
Endpoint options that are not mandatory are denoted by []. When there are no mandatory options for an endpoint, one of the set of [] options MUST be provided. Producer endpoints can also use a special option inBody that in turn should contain the name of the endpoint option whose value will be contained in the Camel Exchange In message.
Any of the endpoint options can be provided in either the endpoint URI, or dynamically in a message header. The message header name must be of the format CamelGoogleCalendar.<option>. Note that the inBody option overrides message header, i.e. the endpoint option inBody=option would override a CamelGoogleCalendar.option header.
115.4. Consumer Endpoints
Any of the producer endpoints can be used as a consumer endpoint. Consumer endpoints can use Scheduled Poll Consumer Options with a consumer. prefix to schedule endpoint invocation. Consumer endpoints that return an array or collection will generate one exchange per element, and their routes will be executed once for each exchange.
115.5. Message Headers
Any URI option can be provided in a message header for producer endpoints with a CamelGoogleCalendar. prefix.
115.6. Message Body
All result message bodies utilize objects provided by the underlying APIs used by the GoogleCalendarComponent. Producer endpoints can specify the option name for incoming message body in the inBody endpoint URI parameter. For endpoints that return an array or collection, a consumer endpoint will map every element to distinct messages.
