Support for multiple channels (#75)

* Support for multiple channels

* MR feedback

* fix query param in readme instructions

Co-authored-by: kshitij katiyar <90389917+Kshitij-Katiyar@users.noreply.github.com>

---------

Co-authored-by: limod <dominic.lehner@proxora.com>
Co-authored-by: Michael Kochell <6913320+mickmister@users.noreply.github.com>
Co-authored-by: kshitij katiyar <90389917+Kshitij-Katiyar@users.noreply.github.com>

Makefile

@@ -55,11 +55,11 @@ golangci-lint:
 server:
 ifneq ($(HAS_SERVER),)
 	mkdir -p server/dist;
-	cd server && env GOOS=linux GOARCH=amd64 $(GO) build $(GO_BUILD_FLAGS) -trimpath -o dist/plugin-linux-amd64;
-	cd server && env GOOS=linux GOARCH=arm64 $(GO) build $(GO_BUILD_FLAGS) -trimpath -o dist/plugin-linux-arm64;
-	cd server && env GOOS=darwin GOARCH=amd64 $(GO) build $(GO_BUILD_FLAGS) -trimpath -o dist/plugin-darwin-amd64;
-	cd server && env GOOS=darwin GOARCH=arm64 $(GO) build $(GO_BUILD_FLAGS) -trimpath -o dist/plugin-darwin-arm64;
-	cd server && env GOOS=windows GOARCH=amd64 $(GO) build $(GO_BUILD_FLAGS) -trimpath -o dist/plugin-windows-amd64.exe;
+	cd server && env GOOS=linux GOARCH=amd64 CGO_ENABLED=0  $(GO) build $(GO_BUILD_FLAGS) -trimpath -o dist/plugin-linux-amd64;
+	cd server && env GOOS=linux GOARCH=arm64 CGO_ENABLED=0 $(GO) build $(GO_BUILD_FLAGS) -trimpath -o dist/plugin-linux-arm64;
+	cd server && env GOOS=darwin GOARCH=amd64 CGO_ENABLED=0 $(GO) build $(GO_BUILD_FLAGS) -trimpath -o dist/plugin-darwin-amd64;
+	cd server && env GOOS=darwin GOARCH=arm64 CGO_ENABLED=0 $(GO) build $(GO_BUILD_FLAGS) -trimpath -o dist/plugin-darwin-arm64;
+	cd server && env GOOS=windows GOARCH=amd64 CGO_ENABLED=0 $(GO) build $(GO_BUILD_FLAGS) -trimpath -o dist/plugin-windows-amd64.exe;
 endif
 
 ## Ensures NPM dependencies are installed without having to run this all the time.

README.md

@@ -20,7 +20,7 @@ Originally developed by [Carlos Tadeu Panato Junior](https://github.com/cpanato/
 
 1. Go to **System Console > Plugins > AWS SNS**.
 
-  1. Set the channel to send notifications to, specified in the format `teamname,channelname`. If the specified channel does not exist, the plugin will create the channel for you.
+  1. Set the channel to send notifications to, specified in the format `teamname,channelname`. If the specified channel does not exist, the plugin will create the channel for you. If you want to specify more than one channel, you can append them separated by `;` e.g. `teamname,channelname;teamname-2,channelname-2`
       - Note: Must be the team and channel handle used in the URL. For example, in the following URL, set the value to `myteam,mychannel`: https://example.com/myteam/channels/mychannel.
 
   2. Set authorized users who can accept AWS SNS subscriptions. Must be a comma-separated list of user IDs.
@@ -34,7 +34,7 @@ Originally developed by [Carlos Tadeu Panato Junior](https://github.com/cpanato/
 ### Step 2: Configure plugin in Amazon AWS
 
 1. Create an [AWS CloudWatch alarm for your instance](https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/using-cloudwatch-createalarm.html).
-2. Create an AWS SNS Topic with an HTTPS subscription to [https://your-mattermost-url/plugins/com.mattermost.aws-sns?token=your-mattermost-token](), where `your-mattermost-url` refers to your Mattermost URL, and `your-mattermost-token` was generated on a previous step. [Follow this documentation](https://docs.safe.com/fme/html/FME_Server_Documentation/ReferenceManual/Amazon_SNS_Publisher_Configure_AWS_Subscription.htm) for additional configuration options.
+2. Create an AWS SNS Topic with an HTTPS subscription to [https://your-mattermost-url/plugins/com.mattermost.aws-sns?token=your-mattermost-token&channel=teamname,channelname](), where `your-mattermost-url` refers to your Mattermost URL, and `your-mattermost-token` was generated on a previous step. The `channel` query parameter specifies the channel that should receive the subscription/messages. If no `channel` parameter is passed, the first channel will be used as default. [Follow this documentation](https://docs.safe.com/fme/html/FME_Server_Documentation/ReferenceManual/Amazon_SNS_Publisher_Configure_AWS_Subscription.htm) for additional configuration options.
 3. Switch to the Mattermost channel you configured to receive notifications. 
 4. Select **Confirm** to accept the subscription posted to the channel.
 5. Configure your AWS CloudWatch Alarms to use the topic you created previously.

go.mod

@@ -7,4 +7,5 @@ require (
 	github.com/mattermost/mattermost-server/v6 v6.0.3
 	github.com/mholt/archiver/v3 v3.5.0
 	github.com/pkg/errors v0.9.1
+	github.com/stretchr/testify v1.7.0
 )

plugin.json

@@ -24,9 +24,9 @@
         "settings": [
             {
                 "key": "TeamChannel",
-                "display_name": "Channel to send notifications to:",
+                "display_name": "Channels to send notifications to:",
                 "type": "text",
-                "help_text": "The channel to send notifications to, specified in the format `teamname,channelname`. If the specified channel does not exist, the plugin will create the channel for you.\n \n Note: Must be the team and channel handle used in the URL. For example, in the following URL, set the value to `myteam,mychannel`: https://example.com/myteam/channels/mychannel.",
+                "help_text": "The channels to send notifications to. Multiple channels can be specified. Format `teamname,channelname;teamname-2,channelname-2`. If the specified channels do not exist, the plugin will create the channels for you.\n \n Note: Must be the team and channel handle used in the URL. For example, in the following URL, set the value to `myteam,mychannel`: https://example.com/myteam/channels/mychannel.",
                 "placeholder": "",
                 "default": null
             },

server/command.go

@@ -56,7 +56,7 @@ func (p *Plugin) ExecuteCommand(c *plugin.Context, args *model.CommandArgs) (*mo
 
 	switch action {
 	case "list-topics":
-		return p.listTopicsToChannel(), nil
+		return p.listTopicsToChannel(args.ChannelId), nil
 	default:
 		return &model.CommandResponse{
 			ResponseType: model.CommandResponseTypeEphemeral,
@@ -66,9 +66,9 @@ func (p *Plugin) ExecuteCommand(c *plugin.Context, args *model.CommandArgs) (*mo
 }
 
 // listTopicsToChannel Lists topics subscribed to the channel
-func (p *Plugin) listTopicsToChannel() *model.CommandResponse {
+func (p *Plugin) listTopicsToChannel(channelID string) *model.CommandResponse {
 	var topics SNSTopics
-	val, err := p.API.KVGet(topicsListPrefix + p.ChannelID)
+	val, err := p.API.KVGet(topicsListPrefix + channelID)
 	if err != nil {
 		p.API.LogError("Failed to Get from KV Store")
 		return &model.CommandResponse{