Email Resource

A Concourse resource that sends emails.

Getting started

Add the following Resource Type to your Concourse pipeline

resource_types:
  - name: email
    type: docker-image
    source:
      repository: pcfseceng/email-resource

Look at the demo pipeline for a complete example.

This resource acts as an SMTP client, using PLAIN auth over TLS. So you need an SMTP server that supports all that.

For development, we've been using Amazon SES with its SMTP support

Source Configuration

source:

Parameters

Within smtp:

• host: Required. SMTP Host name
• port: Required. SMTP Port, must be entered as a string
• anonymous: Optional. Whether or not to require credential. true/false are valid options. If omitted default is false
• username: Required, Conditionally. Username to authenticate with. Ignored if anonymous: true
• password: Required, Conditionally. Password to authenticate with. Ignored if anonymous: true
• skip_ssl_validation: Optional. Whether or not to skip ssl validation. true/false are valid options. If omitted default is false
• ca_cert: Optional. Certificates content to verify servers with custom certificates. Only considered if skip_ssl_validation is false.
• host_origin: Optional. Host to send Hello from. If not provided localhost is used
• login_auth: Optional. This will enable the flag to use Login Auth for authenticated. true/false are valid options. If omitted default is false

Within source:

• from: Required. Email Address to be sent from.
• to: Required.Conditionally. Array of email addresses to send email to. Not required if job params contains a file reference that has to recipients.
• cc: Optional Array of email addresses to cc send email to.
• bcc: Optional Array of email addresses to bcc send email to.

An example source configuration is below.

resources:
- name: send-an-email
  type: email
  source:
    smtp:
      host: smtp.example.com
      port: "587" # this must be a string
      username: a-user
      password: my-password
    from: build-system@example.com
    to: [ "dev-team@example.com", "product@example.net" ] #optional if `params.additional_recipient` is specified

An example source configuration is below supporting sending email when anonymous is permitted.

resources:
- name: send-an-email
  type: email
  source:
    smtp:
      host: smtp.example.com
      port: "587" # this must be a string
      anonymous: true
    from: build-system@example.com
    to: [ "dev-team@example.com", "product@example.net" ]

An exmaple using custom certificates:

resources:
- name: send-an-email
  type: email
  source:
    smtp:
      host: smtp.example.com
      port: "587" # this must be a string
      anonymous: true
      ca_cert: |
        -----BEGIN CERTIFICATE-----
        ...
        -----END CERTIFICATE-----
    from: build-system@example.com
    to: [ "dev-team@example.com", "product@example.net" ]

Note that to is an array, and that port is a string. If you're using fly configure with the --load-vars-from (-l) substitutions, every {{ variable }} automatically gets converted to a string. But for literals you need to surround it with quotes.

Behavior

This is an output-only resource, so check and in actions are no-ops.

out: Send an email

Parameters

• headers: Optional. Path to plain text file containing additional mail headers
• subject: Optional. Path to plain text file containing the subject. Either subject or subject_text required. subject_text takes precedence.
• subject_text: Optional. The subject as text. Either subject or subject_text required. subject_text takes precedence.
• body: Optional. Path to file containing the email body. Either body or body_text required. body_text takes precedence.
• body_text: Optional. The email body as text. Either body or body_text required. body_text takes precedence.
• send_empty_body: Optional. If true, send the email even if the body is empty (defaults to false).
• to: Optional. Path to plain text file containing recipients which could be determined at build time. You can run a task before, which figures out the email of the person who committed last to a git repository (git -C $source_path --no-pager show $(git -C $source_path rev-parse HEAD) -s --format='%ae' > output/email.txt). This file can contain , delimited list of email address if wanting to send to multiples.
• to_text: Optional. The , delimited list of to addresses. to_text appends to any to in params or source
• cc: Optional. Path to plain text file containing recipients which could be determined at build time. This file can contain , delimited list of email address if wanting to send to multiples.
• cc_text: Optional. The , delimited list of cc addresses. cc_text appends to any cc in params or source
• bcc: Optional. Path to plain text file containing recipients which could be determined at build time. This file can contain , delimited list of email address if wanting to send to multiples.
• bcc_text: Optional. The , delimited list of bcc addresses. bcc_text appends to any bcc in params or source
• debug: Optional. If set to "true" (as a string) additional information send to stderr
• attachment_globs: Optional. If provided will attach any file to the email that matches the glob path(s)

For example, a build plan might contain this:

  - put: send-an-email
    params:
      subject: generated-subject-file
      body: generated-body-file

For example, a build plan might contain this if using generated list of recipient(s):

  - put: send-an-email
    params:
      subject: generated-subject-file
      body: generated-body-file
      to: generated-to-file

You can use the values below in any of the source files or text properties to access the corresponding metadata made available by concourse, as documented here

• ${BUILD_ID}
• ${BUILD_NAME}
• ${BUILD_JOB_NAME}
• ${BUILD_PIPELINE_NAME}
• ${ATC_EXTERNAL_URL}
• ${BUILD_TEAM_NAME}

For example:

  - put: send-an-email
    params:
      subject_text: "Build finished: ${BUILD_PIPELINE_NAME}/${BUILD_JOB_NAME}/${BUILD_NAME}"
      body_text: "Build finished: ${ATC_EXTERNAL_URL}/teams/main/pipelines/${BUILD_PIPELINE_NAME}/jobs/${BUILD_JOB_NAME}/builds/${BUILD_NAME}"

HTML Email

To send HTML email set the headers parameter to a file containing the following:

MIME-version: 1.0
Content-Type: text/html; charset="UTF-8"

Build from the source

email-resource is written in Go. To build the binary yourself, follow these steps:

• Install Go. (tested with 1.17)
• Clone the repo
  • git clone git@github.com:pivotal-cf/email-resource.git
  • cd email-resource
• Build:
  • go build -o bin/check check/cmd/*.go
  • go build -o bin/in in/cmd/*.go
  • go build -o bin/out out/cmd/*.go

To cross compile, set the $GOOS and $GOARCH environment variables. For example: GOOS=linux GOARCH=amd64 go build.

Testing

To run the unit tests, use go test ./... -v.