fcm

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README

go-fcm for FCM HTTP v1 API

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Golang client library for Firebase Cloud Messaging v1 API.

The Legacy FCM HTTP Protocol has no construct to make a distinction between Android, iOS and Web notifications. The new HTTP v1 API does.

With this library, you:

Getting Started

CLI App

Usage
go install github.com/tevjef/go-fcm/cmd/fcm-send


NAME:
   go-fcm - Send messages to devices through Firebase Cloud Messaging.

USAGE:
   go-fcm [global options]

VERSION:
   1.0.0

COMMANDS:
     help, h  Shows a list of commands or help for one command

GLOBAL OPTIONS:
   --topic value, -t value       The name of the topic to send a message to.
   --token value, -k value       The device topic or registration id to send a message to.
   --condition value, -c value   The condition to send a message to, e.g. 'foo' in topics && 'bar' in topics
   --title value                 The notification title.
   --body value                  The notification body.
   --validate-only               Validate the message, but don't send it.
   --credentials-location value  Location of the Firebase Admin SDK JSON credentials. [$CREDENTIALS_LOCATION]
   --project-id value            The id of your Firebase project. [$PROJECT_ID]
   --help, -h                    show help
   --version, -v                 print the version

As package

Usage
go get github.com/tevjef/go-fcm
Example
import (
	"encoding/json"
	"log"

	"github.com/tevjef/go-fcm"
)

func main() {
	// Create the message to be sent.
	msg := &fcm.SendRequest{
		ValidateOnly: true,
		Message: &fcm.Message{
			Token: "bk3RNwTe3H0:CI2k_HHwgIpoDKCIZvvDMExUdFQ3P1...",
			Notification: &fcm.Notification{
				Title: "FCM Message",
				Body:  "This is a Firebase Cloud Messaging Topic Message!",
			},
			Apns: &fcm.ApnsConfig{
				Payload: &fcm.ApnsPayload{
					Aps: &fcm.ApsDictionary{
						Alert: &fcm.ApnsAlert{
							LaunchImage: "UILaunchImageFileKey",
						},
						Badge:            1,
						Category:         "NEW_MESSAGE_CATEGORY",
						ContentAvailable: int(fcm.ApnsContentAvailable),
					},
				},
			},
			Android: &fcm.AndroidConfig{
				Priority: string(fcm.AndroidHighPriority),
				TTL:      "84000s",
				Notification: &fcm.AndroidNotification{
					Icon:        "ic_notification",
					Color:       "#rrggbb",
					ClickAction: "MainActivity",
				},
			},
		},
	}

	// Create a FCM client to send the message.
	client, err := fcm.NewClient("projectID", "sa.json")
	if err != nil {
		log.Fatalln(err)
	}

	// Send the message and receive the response without retries.
	response, err := client.Send(msg)
	if err != nil {
		log.Fatalln(err)
	}

	log.Printf("%#v\n", response)
}
Example JSON sent to FCM HTTP v1 API
{
   "validate_only": true,
   "message": {
     "token": "bk3RNwTe3H0:CI2k_HHwgIpoDKCIZvvDMExUdFQ3P1...",
     or
     "topic": "cats", 
     or
     "condition": "'dogs' in topics || 'cats' in topics", 
     "apns": {
       "headers": {
         "apns-expiration": "14567890",
         "apns-priority": "10",
         "apns-topic": "my-topic",
         "apns-collapse-id": "my-collapse-id"
       },
       "payload": {
         "acme1": "bar",
         "acme2": [
           "bang",
           "whiz"
         ],
         "aps": {
           "alert": {
             "action-loc-key": "PLAY",
             "body": "Acme message received from Johnny Appleseed",
             "launch-image": "UILaunchImageFileKey",
             "loc-args": [
               "Jenna",
               "Frank"
             ],
             "loc-key": "GAME_PLAY_REQUEST_FORMAT",
             "title": "Acme title",
             "title-loc-args": [
               "Jenna",
               "Frank"
             ],
             "title-loc-key": "GAME_PLAY_REQUEST_FORMAT"
           },
           "badge": 1,
           "category": "NEW_MESSAGE_CATEGORY",
           "content-available": 1,
           "sound": "chime.aiff",
           "thread-id": "my-thread-id"
         }
       }
     },
     "android": {
       "collapse_key": "my-collapse-key",
       "priority": "HIGH",
       "ttl": "84000s",
       "restricted_package_name": "com.github.go-fcm",
       "data": {
         "acme1": "bar",
         "acme2": [
           "bang",
           "whiz"
         ]
       },
       "notification": {
         "title": "FCM Message",
         "body": "This is a Firebase Cloud Messaging Topic Message!",
         "icon": "ic_notification",
         "sound": "res_raw_notification_sound.mp3",
         "tag": "my-notification-tag",
         "color": "#rrggbb",
         "click_action": "MainActivity",
         "body_loc_key": "notification_body",
         "body_loc_args": [
           "Jenna",
           "Frank"
         ],
         "title_loc_key": "notification_title",
         "title_loc_args": [
           "Jenna",
           "Frank"
         ]
       }
     },
     "notification": {
       "title": "FCM Message",
       "body": "This is a Firebase Cloud Messaging Topic Message!"
     }
   }
 }

Documentation

Index

Constants

This section is empty.

Variables

View Source 
var (
	// ErrInvalidMessage occurs if push notitication message is nil.
	ErrInvalidMessage = errors.New("message is invalid")

	// ErrInvalidTarget occurs if message topic is empty.
	ErrInvalidTarget = errors.New("target is invalid. topic, token or condition maybe used")

	// ErrInvalidTimeToLive occurs if TimeToLive more then 2419200.
	ErrInvalidTimeToLive = errors.New("messages time-to-live is invalid")

	// ErrInvalidApnsPriority occurs if the priority is not 5 or 10.
	ErrInvalidApnsPriority = errors.New("apns message priority is invalid")
)

Functions

This section is empty.

Types

type AndroidConfig 

type AndroidConfig struct {
	// An identifier of a group of messages that can be collapsed, so that
	// only the last message gets sent when delivery can be resumed.
	// A maximum of 4 different collapse keys is allowed at any given time.
	CollapseKey string `json:"collapse_key,omitempty"`

	// Message priority. Can take "normal" and "high" values.
	Priority string `json:"priority,omitempty"`

	// A duration in seconds with up to nine fractional digits, terminated by 's'. Example: "3.5s".
	TTL string `json:"ttl,omitempty"`

	// Package name of the application where the registration tokens must match in order to receive the message.
	RestrictedPackageName string `json:"restricted_package_name,omitempty"`

	// Arbitrary key/value payload. If present, it will override google.firebase.fcm.v1.Message.data.
	// An object containing a list of "key": value pairs.
	// Example: { "name": "wrench", "mass": "1.3kg", "count": "3" }.
	Data map[string]string `json:"data,omitempty"`
	// Notification to send to android devices.
	Notification *AndroidNotification `json:"notification,omitempty"`
}

AndroidConfig represents android specific options for messages sent through FCM connection server.

type AndroidMessagePriority 

type AndroidMessagePriority string

AndroidMessagePriority represents the priority of a message to send to Android devices. 

var (
	// AndroidNormalPriority is the default priority for data messages. Normal priority messages won't open network connections on
	// a sleeping device, and their delivery may be delayed to conserve the battery. For less
	// time-sensitive messages, such as notifications of new email or other data to sync, choose normal
	// delivery priority.
	AndroidNormalPriority AndroidMessagePriority = "normal"

	// AndroidHighPriority is the default priority for notification messages. FCM attempts to deliver high priority
	// messages immediately, allowing the FCM service to wake a sleeping device when possible and open a
	// network connection to your app server. Apps with instant messaging, chat, or voice call alerts,
	// for example, generally need to open a network connection and make sure FCM delivers the message
	// to the device without delay. Set high priority if the message is time-critical and requires the
	// user's immediate interaction, but beware that setting your messages to high priority contributes
	// more to battery drain compared with normal priority messages.
	AndroidHighPriority AndroidMessagePriority = "high"
)

type AndroidNotification 

type AndroidNotification struct {
	// The notification's title. If present, it will override
	// google.firebase.fcm.v1.Notification.title
	Title string `json:"title,omitempty"`

	// The notification's body text. If present, it will override
	// google.firebase.fcm.v1.Notification.body.
	Body string `json:"body,omitempty"`

	// The notification's icon. Sets the notification icon to myicon
	// for drawable resource myicon. If you don't send this key in
	// the request, FCM displays the launcher icon specified in your
	// app manifest.
	Icon string `json:"icon,omitempty"`

	// The sound to play when the device receives the notification.
	// Supports "default" or the filename of a sound resource bundled
	// in the app. Sound files must reside in /res/raw/.
	Sound string `json:"sound,omitempty"`

	// Identifier used to replace existing notifications in the
	// notification drawer. If not specified, each request creates
	// a new notification. If specified and a notification with the
	// same tag is already being shown, the new notification
	// replaces the existing one in the notification drawer.
	Tag string `json:"tag,omitempty"`

	// The notification's icon color, expressed in #rrggbb format.
	Color string `json:"color,omitempty"`

	// The action associated with a user click on the notification.
	// If specified, an activity with a matching intent filter is
	// launched when a user clicks on the notification.
	ClickAction string `json:"click_action,omitempty"`

	// The key to the body string in the app's string resources to
	// use to localize the body text to the user's current localization.
	BodyLocKey string `json:"body_loc_key,omitempty"`

	// Variable string values to be used in place of the format specifiers
	// in body_loc_key to use to localize the body text to the user's
	// current localization.
	BodyLocArgs []string `json:"body_loc_args,omitempty"`

	// The key to the title string in the app's string resources to use to
	// localize the title text to the user's current localization.
	TitleLocKey string `json:"title_loc_key,omitempty"`

	// Variable string values to be used in place of the format specifiers
	// in title_loc_key to use to localize the title text to the user's
	// current localization.
	TitleLocArgs []string `json:"title_loc_args,omitempty"`
}

AndroidNotification represents a notification to send to android devices.

type ApnsAlert 

type ApnsAlert struct {
	// A short string describing the purpose of the notification.
	// Apple Watch displays this string as part of the notification interface.
	// This string is displayed only briefly and should be crafted so that
	// it can be understood quickly. This key was added in iOS 8.2.
	Title string `json:"title,omitempty"`

	// The text of the alert message.
	Body string `json:"body,omitempty"`

	// The key to a title string in the Localizable.strings file for the current
	// localization. The key string can be formatted with %@ and %n$@ specifiers
	// to take the variables specified in the title-loc-args array.
	TitleLocKey string `json:"title-loc-key,omitempty"`

	// Variable string values to appear in place of the format specifiers in title-loc-key.
	TitleLocArgs []string `json:"title-loc-args,omitempty"`
	// If a string is specified, the system displays an alert that includes
	// the Close and View buttons. The string is used as a key to get a
	// localized string in the current localization to use for the right button’s
	// title instead of “View”.
	ActionLocKey string `json:"action-loc-key,omitempty"`

	// A key to an alert-message string in a Localizable.strings file for the current
	// localization (which is set by the user’s language preference). The key string
	// can be formatted with %@ and %n$@ specifiers to take the variables specified in
	// the loc-args array.
	LocKey string `json:"loc-key,omitempty"`

	// Variable string values to appear in place of the format specifiers in loc-key.
	LocArgs []string `json:"loc-args,omitempty"`

	// The filename of an image file in the app bundle, with or without the filename
	// extension. The image is used as the launch image when users tap the action button
	// or move the action slider. If this property is not specified, the system either uses
	// the previous snapshot, uses the image identified by the UILaunchImageFile key in the
	//  app’s Info.plist file, or falls back to Default.png.
	LaunchImage string `json:"launch-image,omitempty"`
}

ApnsAlert represents a APNS alert

type ApnsConfig 

type ApnsConfig struct {
	Headers *ApnsHeaders           `json:"headers,omitempty"`
	Payload map[string]interface{} `json:"payload,omitempty"`
}

ApnsConfig represents Apple Push Notification Service specific options.

type ApnsContentAvailability 

type ApnsContentAvailability int

ApnsContentAvailability represents the content-available key in a APNS notification which may wither be 1 or 0. 

const (
	// ApnsContentUnavailable flags the notification to be delievered directly to the user
	// without first waking your app up.
	ApnsContentUnavailable ApnsContentAvailability = 0

	// ApnsContentAvailable flags the notification to be delivered to the user’s device in the background.
	// iOS wakes up your app in the background and gives it up to 30 seconds to run.
	ApnsContentAvailable ApnsContentAvailability = 1
)

type ApnsHeaders 

type ApnsHeaders struct {

	// If this value is nonzero, APNs stores the notification and tries to deliver it at least
	// once, repeating the attempt as needed if it is unable to deliver the notification the
	// first time. If the value is 0, APNs treats the notification as if it expires immediately
	// and does not store the notification or attempt to redeliver it.
	Expiration string `json:"apns-expiration,omitempty"`

	// If you omit this header, the APNs server sets the priority to 10.
	Priority string `json:"apns-priority,omitempty"`

	// If you are using a provider token instead of a certificate, you must specify a value for
	// this request header. The topic you provide should be provisioned for the your team named
	// in your developer account.
	Topic string `json:"apns-topic,omitempty"`

	// Multiple notifications with the same collapse identifier are displayed to the user as
	//  a single notification. The value of this key must not exceed 64 bytes.
	CollapseID string `json:"apns-collapse-id,omitempty"`
}

ApnsHeaders represents a collection of APNS headers

type ApnsMessagePriority 

type ApnsMessagePriority string

ApnsMessagePriority represents the priority of the notification. Specify one of the following values: 

var (
	// ApnsNormalPriority sends the push message at a time that takes into account power considerations
	// for the device. Notifications with this priority might be grouped and delivered
	// in bursts. They are throttled, and in some cases are not delivered.
	ApnsNormalPriority ApnsMessagePriority = "5"

	// ApnsHighPriority sends the push message immediately. Notifications with this priority
	// must trigger an alert, sound, or badge on the target device. It is an error
	// to use this priority for a push notification that contains only the
	// content-available key.
	ApnsHighPriority ApnsMessagePriority = "10"
)

type ApnsPayload 

type ApnsPayload struct {
	Aps *ApsDictionary `json:"aps,omitempty"`
}

ApnsPayload defines an APNS notification.

func (*ApnsPayload) MustToMap 

func (payload *ApnsPayload) MustToMap() map[string]interface{}

MustToMap converts a ApnsPayload struct to a map[string]interface{}. It exits the program is this operation fails.

func (*ApnsPayload) ToMap 

func (payload *ApnsPayload) ToMap() (map[string]interface{}, error)

ToMap converts a ApnsPayload struct to a map[string]interface{}. It also returns an error if the operation fails.

type ApsDictionary 

type ApsDictionary struct {
	// Include this key when you want the system to display a standard
	// alert or a banner. The notification settings for your app on
	// the user’s device determine whether an alert or banner is displayed.
	Alert *ApnsAlert `json:"alert,omitempty"`

	// Include this key when you want the system to modify the badge of
	// your app icon. If this key is not included in the dictionary,
	// the badge is not changed. To remove the badge, set the value of this key to 0.
	Badge int `json:"badge,omitempty"`

	// Include this key when you want the system to play a sound. The value of
	// this key is the name of a sound file in your app’s main bundle or in the
	// Library/Sounds folder of your app’s data container. If the sound file
	// cannot be found, or if you specify defaultfor the value, the system plays
	// the default alert sound.
	Sound string `json:"sound,omitempty"`

	// Provide this key with a string value that represents the notification’s type.
	// This value corresponds to the value in the "identifier" property of one of
	// your app’s registered categories.
	Category string `json:"category,omitempty"`

	// Provide this key with a string value that represents the app-specific identifier
	// for grouping notifications. If you provide a Notification Content app extension,
	// you can use this value to group your notifications together.
	ThreadID string `json:"thread-id,omitempty"`

	// Include this key with a value of 1 to configure a background update notification.
	// When this key is present, the system wakes up your app in the background and
	// delivers the notification to its app delegate.
	ContentAvailable int `json:"content-available,omitempty"`

	// The notification service app extension flag. If the value is 1, the system passes
	// the notification to your notification service app extension before delivery.
	// Use your extension to modify the notification’s content.
	MutableContent int `json:"mutable-content,omitempty"`
}

ApsDictionary defines an APNS notification.

type Client 

type Client struct {
	// contains filtered or unexported fields
}

Client abstracts the interaction between the application server and the FCM server via HTTP protocol. The developer must obtain a service account private key in JSON and the Firebase project id from the Firebase console and pass it to the `Client` so that it can perform authorized requests on the application server's behalf.

func NewClient 

func NewClient(projectID string, jsonKey []byte, opts ...Option) (*Client, error)

NewClient creates new Firebase Cloud Messaging Client based on a service account JSON key file.

func (*Client) Send 

func (c *Client) Send(req *SendRequest) (*Message, error)

Send sends a message to the FCM server.

type HttpError 

type HttpError struct {
	RequestDump  string
	ResponseDump string
	Err          error
}

HttpError contains the dump of the request and response for debugging purposes.

func (HttpError) Error 

func (fcmError HttpError) Error() string

type Message 

type Message struct {
	// The identifier of the message sent, in the format of projects/*/messages/{message_id}.
	Name string `json:"name,omitempty"`

	// Registration token to send a message to.
	Token string `json:"token,omitempty"`

	// Topic name to send a message to, e.g. "weather". Note: "/topics/" prefix should not be provided.
	Topic string `json:"topic,omitempty"`

	// Condition to send a message to, e.g. "'foo' in topics && 'bar' in topics".
	Condition string `json:"condition,omitempty"`

	// Apple Push Notification Service specific options.
	Apns *ApnsConfig `json:"apns,omitempty"`

	// Webpush protocol options.
	Webpush *WebpushConfig `json:"webpush,omitempty"`

	// Android specific options for messages sent through FCM connection server.
	Android *AndroidConfig `json:"android,omitempty"`

	// Basic notification template to use across all platforms.
	Notification *Notification `json:"notification,omitempty"`

	// Arbitrary key/value payload.
	// An object containing a list of "key": value pairs.
	// Example: { "name": "wrench", "mass": "1.3kg", "count": "3" }.
	Data map[string]string `json:"data,omitempty"`
}

Message represents list of targets, options, and payload for HTTP JSON messages.

func (Message) MessageID 

func (msg Message) MessageID() string

MessageID returns the message id the successful send request.

func (*Message) Validate 

func (msg *Message) Validate() error

Validate returns an error if the message is not well-formed.

type Notification 

type Notification struct {
	// The notification's title.
	Title string `json:"title,omitempty"`

	// The notification's body text.
	Body string `json:"body,omitempty"`
}

Notification specifies the basic notification template to use across all platforms.

type Option 

type Option func(*Client) error

Option configurates Client with defined option.

func WithEndpoint 

func WithEndpoint(endpoint string) Option

WithEndpoint returns Option to configure FCM Endpoint.

func WithHTTPClient 

func WithHTTPClient(httpClient *http.Client) Option

WithHTTPClient returns Option to configure HTTP Client.

type SendRequest 

type SendRequest struct {
	// Flag for testing the request without actually delivering the message.
	ValidateOnly bool `json:"validate_only,omitempty"`
	// Message to send.
	Message *Message `json:"message,omitempty"`
}

SendRequest has a flag for testing and the actual message to send.

type WebpushConfig 

type WebpushConfig struct {

	// An object containing a list of "key": value pairs.
	// Example: { "name": "wrench", "mass": "1.3kg", "count": "3" }.
	Headers map[string]string `json:"headers,omitempty"`

	// An object containing a list of "key": value pairs.
	// Example: { "name": "wrench", "mass": "1.3kg", "count": "3" }.
	Data map[string]string `json:"data,omitempty"`

	// A web notification to send.
	Notification *WebpushNotification `json:"notification,omitempty"`
}

WebpushConfig represents the Webpush protocol outlined in https://tools.ietf.org/html/rfc8030 https://firebase.google.com/docs/reference/fcm/rest/v1/projects.messages#WebpushConfig

type WebpushNotification 

type WebpushNotification struct {
	// The notification's title. If present, it will override
	// google.firebase.fcm.v1.Notification.title.
	Title string `json:"title,omitempty"`

	// The notification's body text. If present, it will override
	// google.firebase.fcm.v1.Notification.body.
	Body string `json:"body,omitempty"`

	// The URL to use for the notification's icon.
	Icon string `json:"icon,omitempty"`
}

WebpushNotification represents a web notification to send via webpush protocol. https://firebase.google.com/docs/reference/fcm/rest/v1/projects.messages#AndroidNotification

Source Files

View all Source files

Directories

Path Synopsis
cmd
fcm-send

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