Feature: Interactive Role Finder (#87)

cmd/export.go

@@ -37,12 +37,17 @@ var exportCmd = &cobra.Command{
 	Use:   "export [role_name]",
 	Short: exportShortHelp,
 	Long:  exportLongHelp,
-	Args:  cobra.ExactArgs(1),
+	Args:  cobra.MaximumNArgs(1),
 	RunE:  runExport,
 }
 
 func runExport(cmd *cobra.Command, args []string) error {
-	role := args[0]
+	// If a role was provided, use it, otherwise prompt
+	role, err := InteractiveRolePrompt(args, region, nil)
+	if err != nil {
+		return err
+	}
+
 	creds, err := creds.GetCredentials(role, noIpRestrict, assumeRole, "")
 	if err != nil {
 		return err

cmd/file.go

@@ -45,13 +45,18 @@ var fileCmd = &cobra.Command{
 	Use:   "file [role_name]",
 	Short: fileShortHelp,
 	Long:  fileLongHelp,
-	Args:  cobra.ExactArgs(1),
+	Args:  cobra.MaximumNArgs(1),
 	RunE:  runFile,
 }
 
 func runFile(cmd *cobra.Command, args []string) error {
-	role := args[0]
-	err := updateCredentialsFile(role, profileName, destination, noIpRestrict, assumeRole)
+	// If a role was provided, use it, otherwise prompt
+	role, err := InteractiveRolePrompt(args, region, nil)
+	if err != nil {
+		return err
+	}
+
+	err = updateCredentialsFile(role, profileName, destination, noIpRestrict, assumeRole)
 	if err != nil {
 		return err
 	}

cmd/helpers.go

@@ -0,0 +1,83 @@
+/*
+ * Copyright 2020 Netflix, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package cmd
+
+import (
+	"fmt"
+	"os"
+	"strings"
+
+	"github.com/lithammer/fuzzysearch/fuzzy"
+	"github.com/manifoldco/promptui"
+	"github.com/netflix/weep/pkg/creds"
+)
+
+// InteractiveRolePrompt will present the user with a fuzzy-searchable list of roles if
+// - We are currently attached to an interactive tty
+// - The user has not disabled them through the WEEP_DISABLE_INTERACTIVE_PROMPTS option
+func InteractiveRolePrompt(args []string, region string, client *creds.Client) (string, error) {
+	// If a role was provided, just use that
+	if len(args) > 0 {
+		return args[0], nil
+	}
+
+	if !isRunningInTerminal() {
+		return "", fmt.Errorf("no role provided, and cannot prompt for input")
+	}
+
+	if os.Getenv("WEEP_DISABLE_INTERACTIVE_PROMPTS") == "1" {
+		return "", fmt.Errorf("no role provided, and interactive prompts are disabled")
+	}
+
+	// If a client was not provided, create one using the provided region
+	if client == nil {
+		var err error
+		client, err = creds.GetClient(region)
+		if err != nil {
+			return "", err
+		}
+	}
+
+	// Retrieve the list of roles
+	roles, err := client.Roles()
+	if err != nil {
+		return "", err
+	}
+
+	// Prompt the user
+	prompt := promptui.Select{
+		Label: "Select Role",
+		Items: roles,
+		Size:  16,
+		Searcher: func(input string, index int) bool {
+			return fuzzy.MatchNormalized(strings.ToLower(input), strings.ToLower(roles[index]))
+		},
+		StartInSearchMode: true,
+	}
+
+	_, role, err := prompt.Run()
+	if err != nil {
+		return "", err
+	}
+
+	return role, nil
+}
+
+func isRunningInTerminal() bool {
+	fileInfo, _ := os.Stdout.Stat()
+	return (fileInfo.Mode() & os.ModeCharDevice) != 0
+}

go.mod

@@ -9,27 +9,17 @@ require (
 	github.com/golang/glog v0.0.0-20210429001901-424d2337a529
 	github.com/gorilla/mux v1.8.0
 	github.com/kardianos/service v1.2.0
-	github.com/kr/pretty v0.2.0 // indirect
+	github.com/lithammer/fuzzysearch v1.1.2
 	github.com/lunixbochs/vtclean v1.0.0 // indirect
-	github.com/magiconair/properties v1.8.5 // indirect
 	github.com/manifoldco/promptui v0.8.0
-	github.com/mattn/go-colorable v0.1.8 // indirect
 	github.com/mattn/go-isatty v0.0.13 // indirect
 	github.com/mitchellh/go-homedir v1.1.0
-	github.com/mitchellh/mapstructure v1.4.1 // indirect
-	github.com/pelletier/go-toml v1.9.2 // indirect
 	github.com/pkg/errors v0.9.1
 	github.com/russross/blackfriday/v2 v2.1.0 // indirect
 	github.com/sirupsen/logrus v1.8.1
-	github.com/spf13/afero v1.6.0 // indirect
-	github.com/spf13/cast v1.3.1 // indirect
-	github.com/spf13/cobra v1.1.3
-	github.com/spf13/jwalterweatherman v1.1.0 // indirect
-	github.com/spf13/viper v1.7.1
-	github.com/stretchr/testify v1.5.1 // indirect
+	github.com/spf13/cobra v1.2.1
+	github.com/spf13/viper v1.8.1
 	golang.org/x/sys v0.0.0-20210608053332-aa57babbf139 // indirect
-	golang.org/x/text v0.3.6 // indirect
-	gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 // indirect
 	gopkg.in/ini.v1 v1.62.0
 	gopkg.in/yaml.v2 v2.4.0
 )