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Chapter 61. GoogleMail

GoogleMail component
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Available as of Camel 2.15

Component Description
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The Google Mail component provides access to Gmail via the Google Mail Web APIs.
Google Mail uses the 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 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 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-mail</artifactId>
        <version>2.17.0.redhat-630xxx</version>
</dependency>
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URI Format
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The GoogleMail Component uses the following URI format: 
google-mail://endpoint-prefix/endpoint?[options]
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Endpoint prefix can be one of:
  • attachments
  • drafts
  • history
  • labels
  • messages
  • threads
  • users

GoogleMailComponent
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The GoogleMail Component can be configured with the options below. These options can be provided using the component's bean property configuration of type org.apache.camel.component.google.mail.GoogleMailConfiguration.
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Option Type
accessToken String OAuth2 access token. This typically expires after an hour so refreshToken is recommended for long term usage.
applicationName String Google drive application name. Example would be camel-google-mail/1.0.
clientId String Client ID of the drive application.
clientSecret String Client secret of the drive application.
refreshToken
String
OAuth2 refresh token. Using this token, the Google Mail component can obtain a new accessToken whenever the current one expires—a necessity if the application is long-lived.
scopes List<String> Specifies the level of permissions you want a drive application to have to a user account. See https://developers.google.com/gmail/api/auth/scopes for more info.
user String
Camel 2.16.0: The email address of the user the application is trying to impersonate in the service account flow.
p12FileName String
Camel 2.16.0: the name of the .p12 file which has the private key to use with the Google Service Account.

Producer Endpoints
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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 CamelGoogleMail.<option>. Note that the inBody option overrides message header, i.e. the endpoint option inBody=option would override a CamelGoogleMail.option header.
For more information on the endpoints and options see API documentation at: https://developers.google.com/gmail/api/v1/reference/

1. Endpoint Prefix attachments
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The following endpoints can be invoked with the prefix attachments as follows: 
google-mail://attachments/endpoint?[options]
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Endpoint Shorthand Alias Options Result Body Type
get id, messageId, userId com.google.api.services.gmail.model.MessagePartBody

URI Options for attachments
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Name Type
id String
messageId String
userId String

2. Endpoint Prefix drafts
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The following endpoints can be invoked with the prefix drafts as follows: 
google-mail://drafts/endpoint?[options]
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Endpoint Shorthand Alias Options Result Body Type
create [mediaContent], content, userId com.google.api.services.gmail.model.Draft
delete id, userId
get id, userId com.google.api.services.gmail.model.Draft
list userId com.google.api.services.gmail.model.ListDraftsResponse
send [mediaContent], content, userId com.google.api.services.gmail.model.Message
update [mediaContent], content, id, userId com.google.api.services.gmail.model.Draft

URI Options for drafts
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Name Type
content com.google.api.services.gmail.model.Draft
id String
mediaContent com.google.api.client.http.AbstractInputStreamContent
userId String

3. Endpoint Prefix history
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The following endpoints can be invoked with the prefix history as follows: 
google-mail://history/endpoint?[options]
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Endpoint Shorthand Alias Options Result Body Type
list userId com.google.api.services.gmail.model.ListHistoryResponse

URI Options for history
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Name Type
userId String

4. Endpoint Prefix labels
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The following endpoints can be invoked with the prefix labels as follows: 
google-mail://labels/endpoint?[options]
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Endpoint Shorthand Alias Options Result Body Type
create content, userId com.google.api.services.gmail.model.Label
delete id, userId
get id, userId com.google.api.services.gmail.model.Label
list userId com.google.api.services.gmail.model.ListLabelsResponse
patch content, id, userId com.google.api.services.gmail.model.Label
update content, id, userId com.google.api.services.gmail.model.Label

URI Options for labels
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Name Type
content com.google.api.services.gmail.model.Label
id String
userId String

5. Endpoint Prefix messages
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The following endpoints can be invoked with the prefix messages as follows: 
google-mail://messages/endpoint?[options]
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Endpoint Shorthand Alias Options Result Body Type
delete id, userId
get id, userId com.google.api.services.gmail.model.Message
gmailImport [mediaContent], content, userId com.google.api.services.gmail.model.Message
insert [mediaContent], content, userId com.google.api.services.gmail.model.Message
list userId com.google.api.services.gmail.model.ListMessagesResponse
modify id, modifyMessageRequest, userId com.google.api.services.gmail.model.Message
send [mediaContent], content, userId com.google.api.services.gmail.model.Message
trash id, userId
untrash id, userId

URI Options for messages
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Name Type
content com.google.api.services.gmail.model.Message
id String
mediaContent com.google.api.client.http.AbstractInputStreamContent
modifyMessageRequest com.google.api.services.gmail.model.ModifyMessageRequest
userId String

6. Endpoint Prefix threads
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The following endpoints can be invoked with the prefix threads as follows: 
google-mail://threads/endpoint?[options]
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Endpoint Shorthand Alias Options Result Body Type
delete id, userId
get id, userId com.google.api.services.gmail.model.Thread
list userId com.google.api.services.gmail.model.ListThreadsResponse
modify content, id, userId com.google.api.services.gmail.model.Thread
trash id, userId
untrash id, userId

URI Options for threads
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Name Type
content com.google.api.services.gmail.model.ModifyThreadRequest
id String
userId String

7. Endpoint Prefix users
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The following endpoints can be invoked with the prefix users as follows: 
google-mail://users/endpoint?[options]
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Endpoint Shorthand Alias Options Result Body Type
getProfile userId com.google.api.services.gmail.model.Profile

URI Options for users
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Name Type
userId String

Consumer Endpoints
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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.

Message Headers
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Any URI option can be provided in a message header for producer endpoints with a CamelGoogleMail. prefix.

Message Body
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All result message bodies utilize objects provided by the underlying APIs used by the GoogleMailComponent. 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.
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