new: new caplets module to manage system caplets

modules/caplets.go

@@ -0,0 +1,148 @@
+package modules
+
+import (
+	"fmt"
+	"io"
+	"net/http"
+	"os"
+
+	"github.com/bettercap/bettercap/caplets"
+	"github.com/bettercap/bettercap/core"
+	"github.com/bettercap/bettercap/log"
+	"github.com/bettercap/bettercap/session"
+
+	"github.com/dustin/go-humanize"
+)
+
+type CapletsModule struct {
+	session.SessionModule
+}
+
+func NewCapletsModule(s *session.Session) *CapletsModule {
+	c := &CapletsModule{
+		SessionModule: session.NewSessionModule("caplets", s),
+	}
+
+	c.AddHandler(session.NewModuleHandler("caplets.show", "",
+		"Show a list of installed caplets.",
+		func(args []string) error {
+			return c.Show()
+		}))
+
+	c.AddHandler(session.NewModuleHandler("caplets.paths", "",
+		"Show a list caplet search paths.",
+		func(args []string) error {
+			return c.Paths()
+		}))
+
+	c.AddHandler(session.NewModuleHandler("caplets.update", "",
+		"Install/updates the caplets.",
+		func(args []string) error {
+			return c.Update()
+		}))
+
+	return c
+}
+
+func (c *CapletsModule) Name() string {
+	return "caplets"
+}
+
+func (c *CapletsModule) Description() string {
+	return "A module to list and update caplets."
+}
+
+func (c *CapletsModule) Author() string {
+	return "Simone Margaritelli <evilsocket@protonmail.com>"
+}
+
+func (c *CapletsModule) Configure() error {
+	return nil
+}
+
+func (c *CapletsModule) Stop() error {
+	return nil
+}
+
+func (c *CapletsModule) Start() error {
+	return nil
+}
+
+func (c *CapletsModule) Show() error {
+	caplets := caplets.List()
+	if len(caplets) == 0 {
+		return fmt.Errorf("no installed caplets on this system, use the caplets.update command to download them")
+	}
+
+	colNames := []string{
+		"Name",
+		"Path",
+		"Size",
+	}
+	rows := [][]string{}
+
+	for _, caplet := range caplets {
+		rows = append(rows, []string{
+			core.Bold(caplet.Name),
+			caplet.Path,
+			core.Dim(humanize.Bytes(uint64(caplet.Size))),
+		})
+	}
+
+	core.AsTable(os.Stdout, colNames, rows)
+
+	return nil
+}
+
+func (c *CapletsModule) Paths() error {
+	colNames := []string{
+		"Path",
+	}
+	rows := [][]string{[]string{"."}}
+
+	for _, path := range caplets.LoadPaths {
+		rows = append(rows, []string{path})
+	}
+
+	core.AsTable(os.Stdout, colNames, rows)
+	fmt.Printf("(paths can be customized by defining the %s environment variable)\n", core.Bold(caplets.EnvVarName))
+
+	return nil
+}
+
+func (c *CapletsModule) Update() error {
+	if !core.Exists(caplets.InstallBase) {
+		log.Info("creating caplets install path %s ...", caplets.InstallBase)
+		if err := os.MkdirAll(caplets.InstallBase, os.ModePerm); err != nil {
+			return err
+		}
+	}
+
+	out, err := os.Create("/tmp/caplets.zip")
+	if err != nil {
+		return err
+	}
+	defer out.Close()
+
+	log.Info("downloading caplets from %s ...", caplets.InstallArchive)
+
+	resp, err := http.Get(caplets.InstallArchive)
+	if err != nil {
+		return err
+	}
+	defer resp.Body.Close()
+
+	if _, err := io.Copy(out, resp.Body); err != nil {
+		return err
+	}
+
+	log.Info("installing caplets to %s ...", caplets.InstallPath)
+
+	if _, err = core.Unzip("/tmp/caplets.zip", caplets.InstallBase); err != nil {
+		return err
+	}
+
+	os.RemoveAll(caplets.InstallPath)
+
+	return os.Rename(caplets.InstallPathArchive, caplets.InstallPath)
+}