feat(service): Add Pushover service

Fixes #456

README.md

@@ -78,7 +78,7 @@ Yes, please! Contributions of all kinds are very welcome! Feel free to check our
 > Click [here](https://github.com/nikoksr/notify/issues/new?assignees=&labels=affects%2Fservices%2C+good+first+issue%2C+hacktoberfest%2C+help+wanted%2C+type%2Fenhancement%2C+up+for+grabs&template=service-request.md&title=feat%28service%29%3A+Add+%5BSERVICE+NAME%5D+service) to request a missing service.
 
 | Service                                                                        | Path                                     | Credits                                                                                         |       Status       |
-|--------------------------------------------------------------------------------|------------------------------------------|-------------------------------------------------------------------------------------------------|:------------------:|
+| ------------------------------------------------------------------------------ | ---------------------------------------- | ----------------------------------------------------------------------------------------------- | :----------------: |
 | [Amazon SES](https://aws.amazon.com/ses)                                       | [service/amazonses](service/amazonses)   | [aws/aws-sdk-go-v2](https://github.com/aws/aws-sdk-go-v2)                                       | :heavy_check_mark: |
 | [Amazon SNS](https://aws.amazon.com/sns)                                       | [service/amazonsns](service/amazonsns)   | [aws/aws-sdk-go-v2](https://github.com/aws/aws-sdk-go-v2)                                       | :heavy_check_mark: |
 | [Bark](https://apps.apple.com/us/app/bark-customed-notifications/id1403753865) | [service/bark](service/bark)             | -                                                                                               | :heavy_check_mark: |
@@ -93,6 +93,7 @@ Yes, please! Contributions of all kinds are very welcome! Feel free to check our
 | [Matrix](https://www.matrix.org)                                               | [service/matrix](service/matrix)         | [mautrix/go](https://github.com/mautrix/go)                                                     | :heavy_check_mark: |
 | [Microsoft Teams](https://www.microsoft.com/microsoft-teams)                   | [service/msteams](service/msteams)       | [atc0005/go-teams-notify](https://github.com/atc0005/go-teams-notify)                           | :heavy_check_mark: |
 | [Plivo](https://www.plivo.com)                                                 | [service/plivo](service/plivo)           | [plivo/plivo-go](https://github.com/plivo/plivo-go)                                             | :heavy_check_mark: |
+| [Pushover](https://pushover.net/)                                              | [service/pushover](service/pushover)     | [gregdel/pushover](https://github.com/gregdel/pushover)                                         | :heavy_check_mark: |
 | [Pushbullet](https://www.pushbullet.com)                                       | [service/pushbullet](service/pushbullet) | [cschomburg/go-pushbullet](https://github.com/cschomburg/go-pushbullet)                         | :heavy_check_mark: |
 | [RocketChat](https://rocket.chat)                                              | [service/rocketchat](service/rocketchat) | [RocketChat/Rocket.Chat.Go.SDK](https://github.com/RocketChat/Rocket.Chat.Go.SDK)               | :heavy_check_mark: |
 | [SendGrid](https://sendgrid.com)                                               | [service/sendgrid](service/sendgrid)     | [sendgrid/sendgrid-go](https://github.com/sendgrid/sendgrid-go)                                 | :heavy_check_mark: |

go.mod

@@ -63,6 +63,7 @@ require (
 	github.com/google/uuid v1.3.0 // indirect
 	github.com/gorilla/mux v1.8.0 // indirect
 	github.com/gorilla/websocket v1.5.0 // indirect
+	github.com/gregdel/pushover v1.1.0
 	github.com/jmespath/go-jmespath v0.4.0 // indirect
 	github.com/json-iterator/go v1.1.12 // indirect
 	github.com/kevinburke/go-types v0.0.0-20210723172823-2deba1f80ba7 // indirect

go.sum

@@ -122,6 +122,8 @@ github.com/gorilla/mux v1.8.0/go.mod h1:DVbg23sWSpFRCP0SfiEN6jmj59UnW/n46BH5rLB7
 github.com/gorilla/websocket v1.4.2/go.mod h1:YR8l580nyteQvAITg2hZ9XVh4b55+EU/adAjf1fMHhE=
 github.com/gorilla/websocket v1.5.0 h1:PPwGk2jz7EePpoHN/+ClbZu8SPxiqlu12wZP/3sWmnc=
 github.com/gorilla/websocket v1.5.0/go.mod h1:YR8l580nyteQvAITg2hZ9XVh4b55+EU/adAjf1fMHhE=
+github.com/gregdel/pushover v1.1.0 h1:dwHyvrcpZCOS9V1fAnKPaGRRI5OC55cVaKhMybqNsKQ=
+github.com/gregdel/pushover v1.1.0/go.mod h1:EcaO66Nn1StkpEm1iKtBTV3d2A16SoMsVER1PthX7to=
 github.com/h2non/parth v0.0.0-20190131123155-b4df798d6542 h1:2VTzZjLZBgl62/EtslCrtky5vbi9dd7HrQPQIx6wqiw=
 github.com/h2non/parth v0.0.0-20190131123155-b4df798d6542/go.mod h1:Ow0tF8D4Kplbc8s8sSb3V2oUCygFHVp8gC3Dn6U4MNI=
 github.com/hpcloud/tail v1.0.0/go.mod h1:ab1qPbhIpdTxEkNHXyeSf5vhxWSCs/tWer42PpOxQnU=

service/pushover/doc.go

@@ -0,0 +1,38 @@
+/*
+Package pushover implements a Pushover notifier, allowing messages to be sent to multiple recipients and supports
+both users and groups.
+
+Usage:
+
+	package main
+
+	import (
+		"context"
+
+		"github.com/nikoksr/notify"
+		"github.com/nikoksr/notify/service/pushover"
+	)
+
+	func main() {
+
+		notifier := notify.New()
+
+		// Provide your Pushover App token
+		pushoverService := pushover.New("APP_TOKEN")
+
+		// Pass user and/or group IDs for where to send the messages
+		pushoverService.AddReceivers("USER_ID", "GROUP_ID")
+
+		// Tell our notifier to use the Pushover service. You can repeat the above process
+		// for as many services as you like and just tell the notifier to use them.
+		notifier.UseServices(pushoverService)
+
+		// Send a message
+		_ = notifier.Send(
+			context.Background(),
+			"Hello!",
+			"I am a bot written in Go!",
+		)
+	}
+*/
+package pushover

service/pushover/pushover.go

@@ -0,0 +1,66 @@
+// Package pushover implements a Pushover notifier, allowing messages to be sent to multiple recipients and supports
+// both users and groups.
+package pushover
+
+import (
+	"context"
+
+	"github.com/gregdel/pushover"
+	"github.com/pkg/errors"
+)
+
+//go:generate mockery --name=pushoverClient --output=. --case=underscore --inpackage
+type pushoverClient interface {
+	SendMessage(*pushover.Message, *pushover.Recipient) (*pushover.Response, error)
+}
+
+// Compile-time check to ensure that pushover.Pushover implements the pushoverClient interface.
+var _ pushoverClient = new(pushover.Pushover)
+
+// Pushover struct holds necessary data to communicate with the Pushover API.
+type Pushover struct {
+	client     pushoverClient
+	recipients []pushover.Recipient
+}
+
+// New returns a new instance of a Pushover notification service.
+// For more information about Pushover app token:
+//
+//	-> https://support.pushover.net/i175-how-do-i-get-an-api-or-application-token
+func New(appToken string) *Pushover {
+	client := pushover.New(appToken)
+
+	s := &Pushover{
+		client:     client,
+		recipients: []pushover.Recipient{},
+	}
+
+	return s
+}
+
+// AddReceivers takes Pushover user/group IDs and adds them to the internal recipient list. The Send method will send
+// a given message to all of those recipients.
+func (p *Pushover) AddReceivers(recipientIDs ...string) {
+	for _, recipient := range recipientIDs {
+		p.recipients = append(p.recipients, *pushover.NewRecipient(recipient))
+	}
+}
+
+// Send takes a message subject and a message body and sends them to all previously set recipients.
+func (p Pushover) Send(ctx context.Context, subject, message string) error {
+	for i := range p.recipients {
+		select {
+		case <-ctx.Done():
+			return ctx.Err()
+		default:
+			_, err := p.client.SendMessage(
+				pushover.NewMessageWithTitle(message, subject),
+				&p.recipients[i],
+			)
+			if err != nil {
+				return errors.Wrapf(err, "failed to send message to Pushover recipient '%s'", p.recipients[i])
+			}
+		}
+	}
+	return nil
+}

service/pushover/pushover_test.go

@@ -0,0 +1,76 @@
+package pushover
+
+import (
+	"context"
+	"testing"
+
+	"github.com/gregdel/pushover"
+	"github.com/pkg/errors"
+	"github.com/stretchr/testify/require"
+)
+
+func TestPushover_New(t *testing.T) {
+	t.Parallel()
+
+	assert := require.New(t)
+
+	service := New("")
+	assert.NotNil(service)
+}
+
+func TestPushover_AddReceivers(t *testing.T) {
+	t.Parallel()
+
+	assert := require.New(t)
+
+	service := New("")
+	assert.NotNil(service)
+
+	service.AddReceivers("")
+	assert.Len(service.recipients, 1)
+
+	service.AddReceivers("", "")
+	assert.Len(service.recipients, 3)
+}
+
+func TestPushover_Send(t *testing.T) {
+	t.Parallel()
+
+	assert := require.New(t)
+
+	service := New("")
+	assert.NotNil(service)
+
+	// No receivers added
+	ctx := context.Background()
+	err := service.Send(ctx, "subject", "message")
+	assert.Nil(err)
+
+	// Test error response
+	mockClient := newMockPushoverClient(t)
+	mockClient.
+		On("SendMessage", &pushover.Message{Title: "subject", Message: "message"}, pushover.NewRecipient("1234")).
+		Return(&pushover.Response{}, errors.New("some error"))
+
+	service.client = mockClient
+	service.AddReceivers("1234")
+	err = service.Send(ctx, "subject", "message")
+	assert.NotNil(err)
+	mockClient.AssertExpectations(t)
+
+	// Test success response
+	mockClient = newMockPushoverClient(t)
+	mockClient.
+		On("SendMessage", &pushover.Message{Title: "subject", Message: "message"}, pushover.NewRecipient("1234")).
+		Return(&pushover.Response{}, nil)
+
+	mockClient.
+		On("SendMessage", &pushover.Message{Title: "subject", Message: "message"}, pushover.NewRecipient("5678")).
+		Return(&pushover.Response{}, nil)
+
+	service.client = mockClient
+	service.AddReceivers("5678")
+	err = service.Send(ctx, "subject", "message")
+	assert.Nil(err)
+	mockClient.AssertExpectations(t)
+}

service/pushover/usage.md

@@ -0,0 +1,47 @@
+# Pushover Usage
+
+Ensure that you have already navigated to your GOPATH and installed the following packages:
+
+* `go get -u github.com/nikoksr/notify`
+
+## Steps for Pushover App
+
+These are general and very high level instructions
+
+1. Create a new Pushover App by visiting [here](https://pushover.net/apps/build)
+2. Copy your *App token* for usage below
+3. Copy the *User ID* or *Group ID* for where you'd like to send messages
+4. Now you should be good to use the code below
+
+## Sample Code
+
+```go
+package main
+
+import (
+    "github.com/nikoksr/notify"
+    "github.com/nikoksr/notify/service/pushover"
+)
+
+func main() {
+
+    notifier := notify.New()
+
+    // Provide your Pushover App token
+    pushoverService := pushover.New("APP_TOKEN")
+
+    // Pass user and/or group IDs for where to send the messages
+    pushoverService.AddReceivers("USER_ID", "GROUP_ID")
+
+    // Tell our notifier to use the Pushover service. You can repeat the above process
+    // for as many services as you like and just tell the notifier to use them.
+    notifier.UseServices(pushoverService)
+
+    // Send a message
+    _ = notifier.Send(
+        context.Background(),
+        "Hello!",
+        "I am a bot written in Go!",
+    )
+}
+```