Slack Connector 2.0 Examples - Mule 4

The following examples show how to create a public Slack channel, post a message to a channel, upload a file to a Slack channel using a file path, and upload file text content to a Slack channel.

These examples use variables for some field values. You can either:

Replace the variables with their values in the code.
Provide the values for each variable in a properties file and then refer to that file from the connector configuration.

If you don’t know how to use a properties file, see Configuring Property Placeholders.

Before you try the examples, access Anypoint Studio (Studio) and verify that the Mule Palette view displays entries for Slack Connector. If not, follow the instructions in Add the Connector to Your Mule Project.

Create a Channel

This example shows how to create a public Slack channel with a user-specified name.

The following screenshot shows the app flow for this example:

App flow that shows the components used in the Create a Channel example

Figure 1. App flow for the Create a Channel example

Implementing this example involves creating a new Mule project and configuring HTTP Listener, the Create Channel operation, two Transform Message components, and one Logger component.

Before You Begin

This example requires the channels:write scope in both the connection configuration and Slack application.

Configure HTTP Listener

Configure HTTP Listener to initiate a Mule flow when a call is made to the /create-channel path on localhost port 8081:

Create a new Mule project in Studio.
In Studio, click HTTP and drag the Listener operation to the canvas.
In the Listener properties window, click + next to the Connector configuration field to add a global element.
Accept the defaults.
In the Listener properties window, set the Path field value to /create-channel.

Add the First Transform Message Component

The initial Transform Message component takes the channel name as input and then converts the name to JSON format:

In the Mule Palette view, select Core and drag the Transform Message component to the right of Listener.
Change the name of the Transform Message component to Channel Details.
Click the Transform Message component, add the channel name to the output, and set the output format to application/json:

Transform Message component that specifies the channel name in JSON format

Figure 2. First Transform Message component for the Create a Channel example

Add the Create Channel Operation

The Create Channel operation connects with Slack and posts a request to the https://slack.com/api/conversations.create endpoint:

From the Mule Palette view, select Slack and drag the Create Channel operation to the right of Listener.
In the Search properties window, click + next to the Connector configuration field to add a global element.

Enter the following values:

Field Value

Field	Value
Consumer Key	`${consumer.key}`
Consumer Secret	`${consumer.secret}`
Authorization url	`https://slack.com/oauth/authorize`
Access token url	`https://slack.com/api/oauth.access`
Scopes	`channels:write groups:write im:write mpim:write users:read.email`
Listener config	`HTTP_Listener-config`

Consumer Key

${consumer.key}

Consumer Secret

${consumer.secret}

Authorization url

https://slack.com/oauth/authorize

Access token url

https://slack.com/api/oauth.access

Scopes

channels:write groups:write im:write mpim:write users:read.email

Listener config

HTTP_Listener-config

In the Slack properties window, enter payload in the Conversationcreate content field.

Add the Second Transform Message Component

The second Transform Message component converts the result of the Create Channel operation to JSON format:

In the Mule Palette view, select Core and drag the Transform Message component to the right of Listener.
Change the name of the Transform Message component to Payload as JSON.
Click the Transform Message component and set the output to application/json:

Figure 3. Second Transform Message Component for the Create Channel example

Add the Logger Component

The Logger component logs the query result to the console:

In the Mule Palette view, select Core and then select the Logger component.
Configure the Logger component.
Save the project.

Run the App

To run the app:

Start the Mule app.
To send a request, you must perform the OAuth dance. Open your browser and go to http://localhost:8082/authorize to enable access to the app.
Send a POST request to http://localhost:8081/account?name="your channel name".

XML Code for This Example

Paste this code into the Studio XML editor to quickly load the flow for this example into your Mule app:

<?xml version="1.0" encoding="UTF-8"?>

<mule xmlns:http="http://www.mulesoft.org/schema/mule/http" xmlns:ee="http://www.mulesoft.org/schema/mule/ee/core"
	xmlns:slack="http://www.mulesoft.org/schema/mule/slack"
	xmlns="http://www.mulesoft.org/schema/mule/core" xmlns:doc="http://www.mulesoft.org/schema/mule/documentation" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.mulesoft.org/schema/mule/core http://www.mulesoft.org/schema/mule/core/current/mule.xsd
http://www.mulesoft.org/schema/mule/slack http://www.mulesoft.org/schema/mule/slack/current/mule-slack.xsd
http://www.mulesoft.org/schema/mule/ee/core http://www.mulesoft.org/schema/mule/ee/core/current/mule-ee.xsd
http://www.mulesoft.org/schema/mule/http http://www.mulesoft.org/schema/mule/http/current/mule-http.xsd">
	<slack:config name="Slack_Connector_Config" doc:name="Slack Connector Config"  >
		<slack:slack-auth-connection >
			<slack:oauth-authorization-code consumerKey="${consumer.key}" consumerSecret="${consumer.secret}" scopes="channels:write groups:write im:write mpim:write users:read.email "/>
			<slack:oauth-callback-config listenerConfig="HTTP_Listener_config" callbackPath="/callback" authorizePath="/authorize" externalCallbackUrl="http://localhost:8081/callback"/>
		</slack:slack-auth-connection>
	</slack:config>
	<http:listener-config name="HTTP_Listener_config" doc:name="HTTP Listener config" >
		<http:listener-connection host="0.0.0.0" port="8081" />
	</http:listener-config>
	<configuration-properties doc:name="Configuration properties" file="application.properties" />
	<flow name="create-channel-flow" >
		<http:listener doc:name="Listener" config-ref="HTTP_Listener_config" path="/create-channel"/>
		<ee:transform doc:name="Channel Details" >
			<ee:message >
				<ee:set-payload ><![CDATA[%dw 2.0
output application/json
---
{
	name: "your-channel-name"
}]]></ee:set-payload>
			</ee:message>
		</ee:transform>
		<slack:create-conversationscreate doc:name="Create Channel" config-ref="Slack_Connector_Config"/>
		<ee:transform doc:name="Payload as Json" >
			<ee:message >
				<ee:set-payload ><![CDATA[%dw 2.0
output application/json
---
payload]]></ee:set-payload>
			</ee:message>
		</ee:transform>
		<logger level="INFO" doc:name="Result" message="#[payload]"/>
	</flow>
  <flow name="send-message-to-channel-flow" >
		<http:listener doc:name="Listener" config-ref="HTTP_Listener_config" path="/send-message"/>
		<ee:transform doc:name="Message Details" >
			<ee:message >
				<ee:set-payload ><![CDATA[%dw 2.0
output application/json
---
{
	channel: "your-existing-channel",
	text: "Your text goes here"
}]]></ee:set-payload>
			</ee:message>
		</ee:transform>
		<slack:create-chatpost-message doc:name="Send Message" config-ref="Slack_Connector_Config"/>
		<ee:transform doc:name="Payload as Json" >
			<ee:message>
				<ee:set-payload><![CDATA[%dw 2.0
output application/json
---
payload]]></ee:set-payload>
			</ee:message>
		</ee:transform>
		<logger level="INFO" doc:name="Result" message="#[payload]"/>
	</flow>
</mule>xml
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Post a Message to a Channel

This example shows how to post a message to a public, private, or direct message (IM) channel.

The following screenshot shows the app flow for this example:

App flow that shows the components used in the Post a Message to a Channel example

Figure 4. App flow for the Post a Message to a Channel example

Before You Begin

This example requires the following scopes in both the connection configuration and Slack application:

chat:write
chat:write:user
chat:write:bot

Components

This example uses the following components:

HTTP Listener

Initiates a Mule flow when a call is made to the /send/message path on localhost port 8081
First Transform Message component

Specifies the target channel and provides the message content for the Send Message operation
Send Message operation

Connects with Slack and posts the message to the specified channel
Second Transform Message component

Outputs the results of the Send Message operation in JSON format
Logger

Logs the result of the Send Message operation to the console

XML Code for This Example

Paste this code into the Studio XML editor to quickly load the flow for this example into your Mule app:

<?xml version="1.0" encoding="UTF-8"?>

<mule xmlns:http="http://www.mulesoft.org/schema/mule/http" xmlns:ee="http://www.mulesoft.org/schema/mule/ee/core"
	xmlns:slack="http://www.mulesoft.org/schema/mule/slack"
	xmlns="http://www.mulesoft.org/schema/mule/core" xmlns:doc="http://www.mulesoft.org/schema/mule/documentation" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.mulesoft.org/schema/mule/core http://www.mulesoft.org/schema/mule/core/current/mule.xsd
http://www.mulesoft.org/schema/mule/slack http://www.mulesoft.org/schema/mule/slack/current/mule-slack.xsd
http://www.mulesoft.org/schema/mule/ee/core http://www.mulesoft.org/schema/mule/ee/core/current/mule-ee.xsd
http://www.mulesoft.org/schema/mule/http http://www.mulesoft.org/schema/mule/http/current/mule-http.xsd">
	<slack:config name="Slack_Connector_Config" doc:name="Slack Connector Config" >
		<slack:slack-auth-connection >
			<slack:oauth-authorization-code consumerKey="${consumer.key}" consumerSecret="${consumer.secret}" scopes="channels:write groups:write im:write mpim:write users:read.email "/>
			<slack:oauth-callback-config listenerConfig="HTTP_Listener_config" callbackPath="/callback" authorizePath="/authorize" externalCallbackUrl="http://localhost:8081/callback"/>
		</slack:slack-auth-connection>
	</slack:config>
	<http:listener-config name="HTTP_Listener_config" doc:name="HTTP Listener config" >
		<http:listener-connection host="0.0.0.0" port="8081" />
	</http:listener-config>
	<configuration-properties doc:name="Configuration properties" file="application.properties" />
	<flow name="find-user-by-email-flow"  >
		<http:listener doc:name="Listener" config-ref="HTTP_Listener_config" path="find-by-email"/>
		<slack:get-userslookup-by-email doc:name="Find User by Email" config-ref="Slack_Connector_Config" email="example@emailaddress.com"/>
		<ee:transform doc:name="Payload as Json" >
			<ee:message >
				<ee:set-payload ><![CDATA[%dw 2.0
output application/json
---
payload]]></ee:set-payload>
			</ee:message>
		</ee:transform>
		<logger level="INFO" doc:name="Lookup Result" message="#[payload]"/>
	</flow>
  <flow name="send-message-to-channel-flow" >
		<http:listener doc:name="Listener" config-ref="HTTP_Listener_config" path="/send-message"/>
		<ee:transform doc:name="Message Details"  >
			<ee:message >
				<ee:set-payload ><![CDATA[%dw 2.0
output application/json
---
{
	channel: "your-existing-channel",
	text: "Your text goes here"
}]]></ee:set-payload>
			</ee:message>
		</ee:transform>
		<slack:create-chatpost-message doc:name="Send Message" config-ref="Slack_Connector_Config"/>
		<ee:transform doc:name="Payload as Json" >
			<ee:message>
				<ee:set-payload><![CDATA[%dw 2.0
output application/json
---
payload]]></ee:set-payload>
			</ee:message>
		</ee:transform>
		<logger level="INFO" doc:name="Result" message="#[payload]"/>
	</flow>
</mule>xml
Expand content

Upload a File to a Slack Channel (Using File Path)

This example shows how to upload a file to a public or private channel.

The following screenshot shows the app flow for this example:

App flow that shows the components used uploading a file to slack

Figure 5. App flow to upload a file using file path to a channel example

Before You Begin

This example requires the following scopes in both the connection configuration and Slack application:

files:write
files:write:user

Components

This example uses the following components:

HTTP Listener

Initiates a Mule flow when a call is made to the /file-upload path on localhost port 8081
Read operation - File Connector

Reads a file from the specified file path
First Set Variable component

Stores the file content retrieved in the previous step into a variable named fileContent
Get upload url operation

Makes a GET request to Slack. It requires filename and length as mandatory fields, which are provided as attributes.fileName and attributes.size, obtained from the Read operation.
Second Set Variable component

Stores file_id retrieved from the Get upload url operation in a variable named fileId
Request operation - HTTP Connector

Makes a POST request to Slack using the file content retrieved from the Get upload url operation response. The URL is set to [payload.upload_url], and the content is set to [vars.fileContent].
Transform Message

Forms files array using the fileId obtained from previous step
Complete Upload External operation

Makes a POST request to Slack to complete the file upload process. It requires a files array as a mandatory parameter.

If Channel id is not provided, the file is uploaded to the Slack server and remains private.
Logger

Logs the result of the Complete Upload External operation to the console

XML Code for This Example

Paste this code into the Studio XML editor to quickly load the flow for this example into your Mule app:

<?xml version="1.0" encoding="UTF-8"?>

<mule xmlns:file="http://www.mulesoft.org/schema/mule/file" xmlns:http="http://www.mulesoft.org/schema/mule/http"
	xmlns:ee="http://www.mulesoft.org/schema/mule/ee/core"
	xmlns:slack="http://www.mulesoft.org/schema/mule/slack" xmlns="http://www.mulesoft.org/schema/mule/core" xmlns:doc="http://www.mulesoft.org/schema/mule/documentation" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.mulesoft.org/schema/mule/core http://www.mulesoft.org/schema/mule/core/current/mule.xsd
http://www.mulesoft.org/schema/mule/slack http://www.mulesoft.org/schema/mule/slack/current/mule-slack.xsd
http://www.mulesoft.org/schema/mule/ee/core http://www.mulesoft.org/schema/mule/ee/core/current/mule-ee.xsd
http://www.mulesoft.org/schema/mule/http http://www.mulesoft.org/schema/mule/http/current/mule-http.xsd
http://www.mulesoft.org/schema/mule/file http://www.mulesoft.org/schema/mule/file/current/mule-file.xsd">
	<slack:config name="Slack_Connector_Config" doc:name="Slack Connector Config" >
		<slack:slack-auth-connection >
			<slack:oauth-authorization-code consumerKey="${consumer.key}" consumerSecret="${consumer.secret}" scopes="channels:write groups:write im:write mpim:write users:read.email "/>
			<slack:oauth-callback-config listenerConfig="HTTP_Listener_config" callbackPath="/callback" authorizePath="/authorize" externalCallbackUrl="http://localhost:8081/callback"/>
		</slack:slack-auth-connection>
	</slack:config>
	<http:listener-config name="HTTP_Listener_config" doc:name="HTTP Listener config" doc:id="4e474318-0d25-4a26-b1d9-53f8b452c98f" >
		<http:listener-connection host="0.0.0.0" port="8081" />
	</http:listener-config>
	<configuration-properties doc:name="Configuration properties" doc:id="8fd46949-d3c3-49e6-9314-1c7edaa76e96" file="application.properties" />
	<file:config name="File_Config" doc:name="File Config" doc:id="56c48fe4-fd75-47d7-832e-e075cd7ef25f" >
		<file:connection workingDir="/Users/Test/Downloads/" />
	</file:config>
	<flow name="upload-file-to-slack" doc:id="781e1b2a-120a-406b-a9d4-77d239eca9fe" >
	<http:listener doc:name="Listener" doc:id="9f5150f9-d991-40d6-a69b-81ee6baf934f" config-ref="HTTP_Listener_config" path="/file-upload"/>
		<file:read doc:name="Read" doc:id="3b7e29dc-e86b-4da8-8974-7d0e3cd426ca" config-ref="File_Config" path="/Users/Test/Downloads/file.json"/>
            <set-variable doc:name="Set Variable" doc:id="46b7c90f-23a1-4950-8b22-6247225258a5" variableName="fileContent" value="#[payload]"/>
            <slack:get-filesget-upload-urlexternal doc:name="Get upload url" doc:id="1479ee6f-46bc-4583-b4af-561a750cc7da" config-ref="Slack_Connector_Config" length="#[attributes.size]" filename="#[attributes.fileName]"/>
            <set-variable value="#[payload.file_id]" doc:name="Set Variable" doc:id="530368e3-5691-4cca-82e1-af2214aac0f9" variableName="fileId"/>
            <http:request method="POST" doc:name="Request" doc:id="0ac21f20-9351-4b17-83ec-0efc8448c124" url="#[payload.upload_url]" responseTimeout="#[900000]">
                <http:body ><![CDATA[#[vars.fileContent]]]></http:body>
            </http:request>
            <ee:transform doc:name="Transform Message" doc:id="04f725ee-846e-49f9-90a7-94c33362b0c0" >
                <ee:message >
                    <ee:set-payload ><![CDATA[%dw 2.0
output application/json
---
write(
    [
        { id : vars.fileId }
    ],
    "application/json"
)
]]></ee:set-payload>
                </ee:message>
            </ee:transform>
            <slack:create-filescomplete-upload-external doc:name="Complete Upload External" doc:id="56fec9a8-d023-4bbb-a9ca-d5193fd4a1e0" config-ref="Slack_Connector_Config" channelId="${channel.id}" initialComment="Initial Comment" target="completeUploadExt">
                <slack:files >
                    <slack:file value="#[payload]" />
                </slack:files>
            </slack:create-filescomplete-upload-external>
		<logger level="INFO" doc:name="Logger" doc:id="38d1cd87-21f0-4f95-81c1-03806cd61d93" />
            </flow>
</mule>xml
Expand content

Upload File Text Content to a Slack Channel

This example shows how to upload file text content to a public or private channel.

The following screenshot shows the app flow for this example:

App flow that shows the components used for uploading a file to Slack

Figure 6. App flow for uploading file content to a channel example

Before You Begin

This example requires the following scopes in both the connection configuration and Slack application:

files:write
files:write:user

Components

This example uses the following components:

HTTP Listener

Initiates a Mule flow when a call is made to the /file-upload path on localhost port 8081
Set Payload

Sets file text content to the payload
First Set Variable component

Stores the file text content payload to a variable named UploadContent
Get upload url operation

Makes a GET request to Slack. It requires filename and length as mandatory fields, which are provided as attributes.fileName and attributes.size
Second Set Variable component

Stores file_id retrieved from the Get upload url operation in a variable named fileId
Request operation - HTTP Connector

Makes a POST request to Slack using the file content retrieved from the Get upload url operation response. The URL is set to [payload.upload_url], and the content is set to [vars.fileContent].
Transform Message

Forms files array using the fileId obtained from previous step
Complete Upload External operation

Makes a POST request to Slack to complete the file upload process. It requires a files array as a mandatory parameter.

If Channel id is not provided, the file is uploaded to the Slack server and remains private.
Logger

Logs the result of the Complete Upload External operation to the console

XML Code for This Example

Paste this code into the Studio XML editor to quickly load the flow for this example into your Mule app:

<?xml version="1.0" encoding="UTF-8"?>

<mule xmlns:file="http://www.mulesoft.org/schema/mule/file" xmlns:http="http://www.mulesoft.org/schema/mule/http"
	xmlns:ee="http://www.mulesoft.org/schema/mule/ee/core"
	xmlns:slack="http://www.mulesoft.org/schema/mule/slack" xmlns="http://www.mulesoft.org/schema/mule/core" xmlns:doc="http://www.mulesoft.org/schema/mule/documentation" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.mulesoft.org/schema/mule/core http://www.mulesoft.org/schema/mule/core/current/mule.xsd
http://www.mulesoft.org/schema/mule/slack http://www.mulesoft.org/schema/mule/slack/current/mule-slack.xsd
http://www.mulesoft.org/schema/mule/ee/core http://www.mulesoft.org/schema/mule/ee/core/current/mule-ee.xsd
http://www.mulesoft.org/schema/mule/http http://www.mulesoft.org/schema/mule/http/current/mule-http.xsd
http://www.mulesoft.org/schema/mule/file http://www.mulesoft.org/schema/mule/file/current/mule-file.xsd">
	<slack:config name="Slack_Connector_Config" doc:name="Slack Connector Config" >
		<slack:slack-auth-connection >
			<slack:oauth-authorization-code consumerKey="${consumer.key}" consumerSecret="${consumer.secret}" scopes="channels:write groups:write im:write mpim:write users:read.email "/>
			<slack:oauth-callback-config listenerConfig="HTTP_Listener_config" callbackPath="/callback" authorizePath="/authorize" externalCallbackUrl="http://localhost:8081/callback"/>
		</slack:slack-auth-connection>
	</slack:config>
	<http:listener-config name="HTTP_Listener_config1" doc:name="HTTP Listener config" doc:id="84e1326d-0ae0-4f90-b38e-ff630cb9f825" >
		<http:listener-connection host="0.0.0.0" port="8081" />
	</http:listener-config>
	<configuration-properties doc:name="Configuration properties" doc:id="0fcec471-c686-49c7-9cf6-a94b7561cd20" file="application.properties" />
	<file:config name="File_Config" doc:name="File Config" doc:id="d1713841-299b-4778-9f04-567c174701aa" >
		<file:connection workingDir="/Users/Test/Downloads" />
	</file:config>
	<flow name="upload-file-content-to-slack" doc:id="a3f1489d-581d-4773-afda-4796c31715da" >
	<http:listener doc:name="Listener" doc:id="ec5e3594-6e87-4a14-ba89-101b91f151ef" config-ref="HTTP_Listener_config1" path="/file-upload-content"/>
            <set-payload value='#["Content"]' doc:name="Set Payload" doc:id="b65bde4b-664b-4804-9917-bc93a53295d4" />
            <set-variable value="#[payload]" doc:name="Set Variable" doc:id="1d99cd3f-93bf-4d0c-82d7-2eb65715e9db" variableName="UploadContent"/>
		<slack:get-filesget-upload-urlexternal doc:name="Get upload url" doc:id="7d71fc2e-06f8-4b72-ac61-4094c115c1fe" config-ref="Slack_Connector_Config" length="#[sizeOf(vars.UploadContent)]" filename="testfile.txt"/>
            <set-variable value="#[payload.file_id]" doc:name="Set Variable" doc:id="216a7359-ce22-436f-bdbf-067511bded6f" variableName="fileId"/>
            <http:request method="POST" doc:name="Request" doc:id="3b68d9e7-90d5-4dcb-b7db-8708a396dd27" url="#[payload.upload_url]" responseTimeout="#[900000]">
			<http:body ><![CDATA[#[vars.UploadContent]]]></http:body>
            </http:request>
            <ee:transform doc:name="Transform Message" doc:id="cff36871-94ed-484e-929a-ae29b9964adc" >
                <ee:message >
                    <ee:set-payload ><![CDATA[%dw 2.0
output application/json
---
write(
    [
        { id : vars.fileId }
    ],
    "application/json"
)
]]></ee:set-payload>
                </ee:message>
            </ee:transform>
            <slack:create-filescomplete-upload-external doc:name="Complete Upload External" doc:id="1b08e782-4ce8-4c53-b266-9407d6dcca9c" config-ref="Slack_Connector_Config" channelId="${channel.id}" initialComment="Initial Comment" target="completeUploadExt">
			<slack:files />
            </slack:create-filescomplete-upload-external>
		<logger level="INFO" doc:name="Logger" doc:id="2b467bc3-97ac-4f8d-b941-b529ee30bea3" />
            </flow>
</mule>xml
Expand content

Slack Connector 2.0 Examples - Mule 4

Create a Channel

Before You Begin

Configure HTTP Listener

Add the First Transform Message Component

Add the Create Channel Operation

Add the Second Transform Message Component

Add the Logger Component

Run the App

XML Code for This Example

Post a Message to a Channel

Before You Begin

Components

XML Code for This Example

Upload a File to a Slack Channel (Using File Path)

Before You Begin

Components

XML Code for This Example

Upload File Text Content to a Slack Channel

Before You Begin

Components

XML Code for This Example

See Also