238 lines
8.1 KiB
Go
238 lines
8.1 KiB
Go
package cmd
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import (
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"errors"
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"fmt"
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"github.com/urfave/cli/v2"
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"heckel.io/ntfy/client"
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"heckel.io/ntfy/util"
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"log"
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"os"
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"os/exec"
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"os/user"
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"strings"
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)
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var cmdSubscribe = &cli.Command{
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Name: "subscribe",
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Aliases: []string{"sub"},
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Usage: "Subscribe to one or more topics on a ntfy server",
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UsageText: "ntfy subscribe [OPTIONS..] [TOPIC]",
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Action: execSubscribe,
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Flags: []cli.Flag{
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&cli.StringFlag{Name: "config", Aliases: []string{"c"}, Usage: "client config file"},
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&cli.StringFlag{Name: "since", Aliases: []string{"s"}, Usage: "return events since `SINCE` (Unix timestamp, or all)"},
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&cli.BoolFlag{Name: "from-config", Aliases: []string{"C"}, Usage: "read subscriptions from config file (service mode)"},
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&cli.BoolFlag{Name: "poll", Aliases: []string{"p"}, Usage: "return events and exit, do not listen for new events"},
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&cli.BoolFlag{Name: "scheduled", Aliases: []string{"sched", "S"}, Usage: "also return scheduled/delayed events"},
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&cli.BoolFlag{Name: "verbose", Aliases: []string{"v"}, Usage: "print verbose output"},
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},
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Description: `Subscribe to a topic from a ntfy server, and either print or execute a command for
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every arriving message. There are 3 modes in which the command can be run:
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ntfy subscribe TOPIC
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This prints the JSON representation of every incoming message. It is useful when you
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have a command that wants to stream-read incoming JSON messages. Unless --poll is passed,
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this command stays open forever.
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Examples:
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ntfy subscribe mytopic # Prints JSON for incoming messages for ntfy.sh/mytopic
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ntfy sub home.lan/backups # Subscribe to topic on different server
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ntfy sub --poll home.lan/backups # Just query for latest messages and exit
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ntfy subscribe TOPIC COMMAND
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This executes COMMAND for every incoming messages. The message fields are passed to the
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command as environment variables:
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Variable Aliases Description
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--------------- --------------------- -----------------------------------
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$NTFY_ID $id Unique message ID
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$NTFY_TIME $time Unix timestamp of the message delivery
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$NTFY_TOPIC $topic Topic name
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$NTFY_MESSAGE $message, $m Message body
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$NTFY_TITLE $title, $t Message title
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$NTFY_PRIORITY $priority, $prio, $p Message priority (1=min, 5=max)
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$NTFY_TAGS $tags, $tag, $ta Message tags (comma separated list)
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$NTFY_RAW $raw Raw JSON message
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Examples:
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ntfy sub mytopic 'notify-send "$m"' # Execute command for incoming messages
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ntfy sub topic1 /my/script.sh # Execute script for incoming messages
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ntfy subscribe --from-config
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Service mode (used in ntfy-client.service). This reads the config file (/etc/ntfy/client.yml
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or ~/.config/ntfy/client.yml) and sets up subscriptions for every topic in the "subscribe:"
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block (see config file).
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Examples:
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ntfy sub --from-config # Read topics from config file
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ntfy sub --config=/my/client.yml --from-config # Read topics from alternate config file
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The default config file for all client commands is /etc/ntfy/client.yml (if root user),
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or ~/.config/ntfy/client.yml for all other users.`,
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}
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func execSubscribe(c *cli.Context) error {
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// Read config and options
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conf, err := loadConfig(c)
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if err != nil {
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return err
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}
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cl := client.New(conf)
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since := c.String("since")
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poll := c.Bool("poll")
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scheduled := c.Bool("scheduled")
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fromConfig := c.Bool("from-config")
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topic := c.Args().Get(0)
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command := c.Args().Get(1)
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if !fromConfig {
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conf.Subscribe = nil // wipe if --from-config not passed
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}
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var options []client.SubscribeOption
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if since != "" {
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options = append(options, client.WithSince(since))
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}
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if poll {
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options = append(options, client.WithPoll())
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}
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if scheduled {
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options = append(options, client.WithScheduled())
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}
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if topic == "" && len(conf.Subscribe) == 0 {
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return errors.New("must specify topic, type 'ntfy subscribe --help' for help")
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}
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// Execute poll or subscribe
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if poll {
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return doPoll(c, cl, conf, topic, command, options...)
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}
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return doSubscribe(c, cl, conf, topic, command, options...)
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}
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func doPoll(c *cli.Context, cl *client.Client, conf *client.Config, topic, command string, options ...client.SubscribeOption) error {
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for _, s := range conf.Subscribe { // may be nil
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if err := doPollSingle(c, cl, s.Topic, s.Command, options...); err != nil {
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return err
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}
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}
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if topic != "" {
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if err := doPollSingle(c, cl, topic, command, options...); err != nil {
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return err
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}
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}
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return nil
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}
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func doPollSingle(c *cli.Context, cl *client.Client, topic, command string, options ...client.SubscribeOption) error {
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messages, err := cl.Poll(topic, options...)
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if err != nil {
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return err
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}
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for _, m := range messages {
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printMessageOrRunCommand(c, m, command)
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}
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return nil
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}
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func doSubscribe(c *cli.Context, cl *client.Client, conf *client.Config, topic, command string, options ...client.SubscribeOption) error {
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commands := make(map[string]string) // Subscription ID -> command
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for _, s := range conf.Subscribe { // May be nil
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topicOptions := append(make([]client.SubscribeOption, 0), options...)
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for filter, value := range s.If {
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topicOptions = append(topicOptions, client.WithFilter(filter, value))
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}
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subscriptionID := cl.Subscribe(s.Topic, topicOptions...)
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commands[subscriptionID] = s.Command
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}
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if topic != "" {
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subscriptionID := cl.Subscribe(topic, options...)
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commands[subscriptionID] = command
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}
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for m := range cl.Messages {
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command, ok := commands[m.SubscriptionID]
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if !ok {
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continue
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}
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printMessageOrRunCommand(c, m, command)
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}
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return nil
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}
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func printMessageOrRunCommand(c *cli.Context, m *client.Message, command string) {
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if command != "" {
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runCommand(c, command, m)
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} else {
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fmt.Fprintln(c.App.Writer, m.Raw)
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}
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}
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func runCommand(c *cli.Context, command string, m *client.Message) {
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if err := runCommandInternal(c, command, m); err != nil {
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fmt.Fprintf(c.App.ErrWriter, "Command failed: %s\n", err.Error())
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}
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}
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func runCommandInternal(c *cli.Context, command string, m *client.Message) error {
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scriptFile, err := createTmpScript(command)
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if err != nil {
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return err
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}
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defer os.Remove(scriptFile)
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verbose := c.Bool("verbose")
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if verbose {
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log.Printf("[%s] Executing: %s (for message: %s)", util.ShortTopicURL(m.TopicURL), command, m.Raw)
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}
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cmd := exec.Command("sh", "-c", scriptFile)
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cmd.Stdin = c.App.Reader
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cmd.Stdout = c.App.Writer
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cmd.Stderr = c.App.ErrWriter
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cmd.Env = envVars(m)
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return cmd.Run()
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}
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func createTmpScript(command string) (string, error) {
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scriptFile := fmt.Sprintf("%s/ntfy-subscribe-%s.sh.tmp", os.TempDir(), util.RandomString(10))
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script := fmt.Sprintf("#!/bin/sh\n%s", command)
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if err := os.WriteFile(scriptFile, []byte(script), 0700); err != nil {
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return "", err
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}
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return scriptFile, nil
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}
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func envVars(m *client.Message) []string {
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env := os.Environ()
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env = append(env, envVar(m.ID, "NTFY_ID", "id")...)
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env = append(env, envVar(m.Topic, "NTFY_TOPIC", "topic")...)
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env = append(env, envVar(fmt.Sprintf("%d", m.Time), "NTFY_TIME", "time")...)
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env = append(env, envVar(m.Message, "NTFY_MESSAGE", "message", "m")...)
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env = append(env, envVar(m.Title, "NTFY_TITLE", "title", "t")...)
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env = append(env, envVar(fmt.Sprintf("%d", m.Priority), "NTFY_PRIORITY", "priority", "prio", "p")...)
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env = append(env, envVar(strings.Join(m.Tags, ","), "NTFY_TAGS", "tags", "tag", "ta")...)
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env = append(env, envVar(m.Raw, "NTFY_RAW", "raw")...)
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return env
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}
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func envVar(value string, vars ...string) []string {
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env := make([]string, 0)
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for _, v := range vars {
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env = append(env, fmt.Sprintf("%s=%s", v, value))
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}
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return env
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}
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func loadConfig(c *cli.Context) (*client.Config, error) {
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filename := c.String("config")
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if filename != "" {
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return client.LoadConfig(filename)
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}
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u, _ := user.Current()
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configFile := defaultClientRootConfigFile
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if u.Uid != "0" {
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configFile = util.ExpandHome(defaultClientUserConfigFile)
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}
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if s, _ := os.Stat(configFile); s != nil {
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return client.LoadConfig(configFile)
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}
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return client.NewConfig(), nil
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}
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