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https://issues.apache.org/jira/browse/JAMES-2658?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16762518#comment-16762518
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Matthieu Baechler commented on JAMES-2658:
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Speaking about use cases, and after reading Raphael answer: you probably want
to interact at a very different level.
Mailet is for mail delivery. Smart reply makes sense only when the mail is
already delivered. Important email detection could suffer some delay, too.
Raphael gave you a very interesting solution: using the jmap interface (being
in-browser or not doesn't make any difference in my opinion).
Another solution would be to register a mailbox listener, like we do for
SpamAssassin learning for example.
> Generic mailet to call an external microservice, and add extra information to
> an email
> --------------------------------------------------------------------------------------
>
> Key: JAMES-2658
> URL: https://issues.apache.org/jira/browse/JAMES-2658
> Project: James Server
> Issue Type: Wish
> Reporter: Michael Bailly
> Priority: Minor
>
> Hello team. This is a Request For Comments for a feature, to be able to add
> extra information to an email on delivery to a local mailbox.
> h2. Principle
> the mailet calls a remote webservice, with a pre-specified payload. It gets
> back, either an error, or another specific payload. This payload can instruct
> the James server to add informations to the email. The first case, that we
> handle here, is to add extra headers.
>
> h2. Implementation
> OK, I'll try to map the mailet syntax, but I'll make mistakes, it's to
> illustrate the principle.
> James configuration:
> {{<mailet match="..." class="AddExtraInfos"
> endpoint="https://server.com/api/infos"; />}}
> Seeing this, the mailer issues a POST on {{[https://server.com/api/infos]}}
> with the following payload structure:
> {
> {{ "messageId" : "messageId",}}
> {{ "from" : {}}
> {{ "address" : "[email protected]",}}
> {{ "personal" : "first_name last_name"}}
> {{ },}}
> {{ "to" : [ {}}
> {{ "address" : "[email protected]",}}
> {{ "personal" : "first_name last_name of to1"}}
> {{ } ],}}
> {{ "cc" : [ {}}
> {{ "address" : "[email protected]",}}
> {{ "personal" : null}}
> {{ }, {}}
> {{ "address" : "[email protected]",}}
> {{ "personal" : "first_name last_name of cc2"}}
> {{ }, {}}
> {{ "address" : "[email protected]",}}
> {{ "personal" : "first_name last_name of cc3"}}
> {{ } ],}}
> {{ "bcc" : [ ],}}
> {{ "Received" : "Mon, 28 Jan 2019 07:56:43 +0000",}}
> {{ "Date" : "Mon, 28 Jan 2019 07:56:43 +0000",}}
> {{ "in-Reply-To" : "messageId_in_reply_to",}}
> {{ "subject" : "IMPORTANT: Testing The Priority Inbox",}}
> {{ "body" : "\nDear, \n\n this a test of the priority inbox\n
> regards,\nfirst_name last_name\nDirector Tester",}}
> {{ "attachments" : [{}}
> {{ "file_size" : "243534",}}
> {{ "content_name" : "presentation.pdf",}}
> {{ "content_type" : "APPLICATION/PDF"}}
> {{ }, {}}
> {{ "file_size": "243534",}}
> {{ "content_type" : "APPLICATION/PDF",}}
> {{ "content_name" : "performance.pdf"}}
> {{ }],}}
> {{ "emailFolder" : "INBOX",}}
> {{ "user" : "first_name last_name of to1",}}
> {{ "alternativeAddress" : [ "[email protected]",
> "[email protected]" ],}}
> {{ "X-Spam-Flag" : "NO"}}
> {{}}}
> Worth noting: all those attributes are JSON formatting of an email contents,
> EXCEPT:
> * emailFolder : the destination folder of the email
> * user & alternativeAddress : the user the email is delivered to
> This mailet expects a specific format for the response. Here is a proposal:
> 1/ "bypass" (do nothing)
> {{{}}}
> 2/ "add headers"
> {
> "addHeaders": [
> {name: "X-INFO1", value: "some header value"},
> \{name: "X-INFO1-SCORE", value: "0.4"}
> ]
> }
> h3. Handling failure
> The mailet may support a specific attribute to define the behaviour in case
> of failure.
> {{<mailet match="..." class="AddExtraInfos"
> endpoint="https://server.com/api/infos"; on-failure="ignore" />}}
> h3. Configuring retries
> The mailet may support a retry parameter, allowing to retry x times before
> "really" failing. The additional, optional retry delay parameter could set
> the time, in seconds, to wait between each retry.
> {{<mailet match="..." class="AddExtraInfos"
> endpoint="https://server.com/api/infos"; on-failure="ignore" retry="5"
> retry-delay="0.5" />}}
> h3. Setting blocking behaviour
> Some processing may not require an immediate response, and may allow further
> processing of the mailet chain. Here, either the "blocking" or the "async"
> attribute, I can't choose, may be used.
> {{<mailet match="..." class="AddExtraInfos"
> endpoint="https://server.com/api/infos"; on-failure="ignore" retry="5"
> retry-delay="0.5" blocking="false" />}}
> or, as a second proposal
> {{<mailet match="..." class="AddExtraInfos"
> endpoint="https://server.com/api/infos"; on-failure="ignore" retry="5"
> retry-delay="0.5" async="true" />}}
> h2. Things I don't know
> * Where to send email on failure, if the "on-failure" attribute is not
> "ignore".
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