bridges: massive refactor

- automatic flag validation and warning
- generalized prompt
- cleanups

18 files changed, 223 insertions, 377 deletions

diff --git a/bridge/core/auth/options.go b/bridge/core/auth/options.go
index 74189874..1d8c44d1 100644
--- a/bridge/core/auth/options.go
+++ b/bridge/core/auth/options.go
@@ -2,7 +2,7 @@ package auth
 
 type options struct {
 	target string
-	kind   CredentialKind
+	kind   map[CredentialKind]interface{}
 	meta   map[string]string
 }
 
@@ -21,7 +21,8 @@ func (opts *options) Match(cred Credential) bool {
 		return false
 	}
 
-	if opts.kind != "" && cred.Kind() != opts.kind {
+	_, has := opts.kind[cred.Kind()]
+	if len(opts.kind) > 0 && !has {
 		return false
 	}
 
@@ -40,9 +41,13 @@ func WithTarget(target string) Option {
 	}
 }
 
+// WithKind match credentials with the given kind. Can be specified multiple times.
 func WithKind(kind CredentialKind) Option {
 	return func(opts *options) {
-		opts.kind = kind
+		if opts.kind == nil {
+			opts.kind = make(map[CredentialKind]interface{})
+		}
+		opts.kind[kind] = nil
 	}
 }
 
diff --git a/bridge/core/bridge.go b/bridge/core/bridge.go
index ac0d47d7..62fd70f6 100644
--- a/bridge/core/bridge.go
+++ b/bridge/core/bridge.go
@@ -4,6 +4,7 @@ package core
 import (
 	"context"
 	"fmt"
+	"os"
 	"reflect"
 	"regexp"
 	"sort"
@@ -30,18 +31,6 @@ const (
 var bridgeImpl map[string]reflect.Type
 var bridgeLoginMetaKey map[string]string
 
-// BridgeParams holds parameters to simplify the bridge configuration without
-// having to make terminal prompts.
-type BridgeParams struct {
-	Owner      string // owner of the repo                    (Github)
-	Project    string // name of the repo                     (Github,         Launchpad)
-	URL        string // complete URL of a repo               (Github, Gitlab, Launchpad)
-	BaseURL    string // base URL for self-hosted instance    (        Gitlab)
-	CredPrefix string // ID prefix of the credential to use   (Github, Gitlab)
-	TokenRaw   string // pre-existing token to use            (Github, Gitlab)
-	Login      string // username for the passed credential   (Github, Gitlab)
-}
-
 // Bridge is a wrapper around a BridgeImpl that will bind low-level
 // implementation with utility code to provide high-level functions.
 type Bridge struct {
@@ -220,6 +209,8 @@ func RemoveBridge(repo repository.RepoConfig, name string) error {
 
 // Configure run the target specific configuration process
 func (b *Bridge) Configure(params BridgeParams) error {
+	validateParams(params, b.impl)
+
 	conf, err := b.impl.Configure(b.repo, params)
 	if err != nil {
 		return err
@@ -234,6 +225,22 @@ func (b *Bridge) Configure(params BridgeParams) error {
 	return b.storeConfig(conf)
 }
 
+func validateParams(params BridgeParams, impl BridgeImpl) {
+	validParams := impl.ValidParams()
+
+	paramsValue := reflect.ValueOf(params)
+	paramsType := paramsValue.Type()
+
+	for i := 0; i < paramsValue.NumField(); i++ {
+		name := paramsType.Field(i).Name
+		val := paramsValue.Field(i).Interface().(string)
+		_, valid := validParams[name]
+		if val != "" && !valid {
+			_, _ = fmt.Fprintln(os.Stderr, params.fieldWarning(name, impl.Target()))
+		}
+	}
+}
+
 func (b *Bridge) storeConfig(conf Configuration) error {
 	for key, val := range conf {
 		storeKey := fmt.Sprintf("git-bug.bridge.%s.%s", b.Name, key)
diff --git a/bridge/core/interfaces.go b/bridge/core/interfaces.go
index ab2f3977..63340a95 100644
--- a/bridge/core/interfaces.go
+++ b/bridge/core/interfaces.go
@@ -18,6 +18,9 @@ type BridgeImpl interface {
 	// credentials.
 	LoginMetaKey() string
 
+	// The set of the BridgeParams fields supported
+	ValidParams() map[string]interface{}
+
 	// Configure handle the user interaction and return a key/value configuration
 	// for future use
 	Configure(repo *cache.RepoCache, params BridgeParams) (Configuration, error)
diff --git a/bridge/core/params.go b/bridge/core/params.go
new file mode 100644
index 00000000..e398b81a
--- /dev/null
+++ b/bridge/core/params.go
@@ -0,0 +1,36 @@
+package core
+
+import "fmt"
+
+// BridgeParams holds parameters to simplify the bridge configuration without
+// having to make terminal prompts.
+type BridgeParams struct {
+	URL        string // complete URL of a repo               (Github, Gitlab,     , Launchpad)
+	BaseURL    string // base URL for self-hosted instance    (        Gitlab, Jira,          )
+	Login      string // username for the passed credential   (Github, Gitlab, Jira,          )
+	CredPrefix string // ID prefix of the credential to use   (Github, Gitlab, Jira,          )
+	TokenRaw   string // pre-existing token to use            (Github, Gitlab,     ,          )
+	Owner      string // owner of the repo                    (Github,       ,     ,          )
+	Project    string // name of the repo or project key      (Github,       , Jira, Launchpad)
+}
+
+func (BridgeParams) fieldWarning(field string, target string) string {
+	switch field {
+	case "URL":
+		return fmt.Sprintf("warning: --url is ineffective for a %s bridge", target)
+	case "BaseURL":
+		return fmt.Sprintf("warning: --base-url is ineffective for a %s bridge", target)
+	case "Login":
+		return fmt.Sprintf("warning: --login is ineffective for a %s bridge", target)
+	case "CredPrefix":
+		return fmt.Sprintf("warning: --credential is ineffective for a %s bridge", target)
+	case "TokenRaw":
+		return fmt.Sprintf("warning: tokens are ineffective for a %s bridge", target)
+	case "Owner":
+		return fmt.Sprintf("warning: --owner is ineffective for a %s bridge", target)
+	case "Project":
+		return fmt.Sprintf("warning: --project is ineffective for a %s bridge", target)
+	default:
+		panic("unknown field")
+	}
+}
diff --git a/bridge/github/config.go b/bridge/github/config.go
index afb8086c..9167ac26 100644
--- a/bridge/github/config.go
+++ b/bridge/github/config.go
@@ -1,7 +1,6 @@
 package github
 
 import (
-	"bufio"
 	"bytes"
 	"context"
 	"encoding/json"
@@ -10,14 +9,11 @@ import (
 	"io/ioutil"
 	"math/rand"
 	"net/http"
-	"os"
 	"regexp"
 	"sort"
-	"strconv"
 	"strings"
 	"time"
 
-	text "github.com/MichaelMure/go-term-text"
 	"github.com/pkg/errors"
 
 	"github.com/MichaelMure/git-bug/bridge/core"
@@ -25,19 +21,24 @@ import (
 	"github.com/MichaelMure/git-bug/cache"
 	"github.com/MichaelMure/git-bug/input"
 	"github.com/MichaelMure/git-bug/repository"
-	"github.com/MichaelMure/git-bug/util/colors"
 )
 
 var (
 	ErrBadProjectURL = errors.New("bad project url")
 )
 
-func (g *Github) Configure(repo *cache.RepoCache, params core.BridgeParams) (core.Configuration, error) {
-	if params.BaseURL != "" {
-		fmt.Println("warning: --base-url is ineffective for a Github bridge")
+func (g *Github) ValidParams() map[string]interface{} {
+	return map[string]interface{}{
+		"URL":        nil,
+		"Login":      nil,
+		"CredPrefix": nil,
+		"TokenRaw":   nil,
+		"Owner":      nil,
+		"Project":    nil,
 	}
+}
 
-	conf := make(core.Configuration)
+func (g *Github) Configure(repo *cache.RepoCache, params core.BridgeParams) (core.Configuration, error) {
 	var err error
 	var owner string
 	var project string
@@ -121,9 +122,10 @@ func (g *Github) Configure(repo *cache.RepoCache, params core.BridgeParams) (cor
 		return nil, fmt.Errorf("project doesn't exist or authentication token has an incorrect scope")
 	}
 
+	conf := make(core.Configuration)
 	conf[core.ConfigKeyTarget] = target
-	conf[keyOwner] = owner
-	conf[keyProject] = project
+	conf[confKeyOwner] = owner
+	conf[confKeyProject] = project
 
 	err = g.ValidateConfig(conf)
 	if err != nil {
@@ -141,25 +143,25 @@ func (g *Github) Configure(repo *cache.RepoCache, params core.BridgeParams) (cor
 	return conf, core.FinishConfig(repo, metaKeyGithubLogin, login)
 }
 
-func (*Github) ValidateConfig(conf core.Configuration) error {
+func (Github) ValidateConfig(conf core.Configuration) error {
 	if v, ok := conf[core.ConfigKeyTarget]; !ok {
 		return fmt.Errorf("missing %s key", core.ConfigKeyTarget)
 	} else if v != target {
 		return fmt.Errorf("unexpected target name: %v", v)
 	}
 
-	if _, ok := conf[keyOwner]; !ok {
-		return fmt.Errorf("missing %s key", keyOwner)
+	if _, ok := conf[confKeyOwner]; !ok {
+		return fmt.Errorf("missing %s key", confKeyOwner)
 	}
 
-	if _, ok := conf[keyProject]; !ok {
-		return fmt.Errorf("missing %s key", keyProject)
+	if _, ok := conf[confKeyProject]; !ok {
+		return fmt.Errorf("missing %s key", confKeyProject)
 	}
 
 	return nil
 }
 
-func usernameValidator(name string, value string) (string, error) {
+func usernameValidator(_ string, value string) (string, error) {
 	ok, err := validateUsername(value)
 	if err != nil {
 		return "", err
@@ -241,67 +243,31 @@ func randomFingerprint() string {
 }
 
 func promptTokenOptions(repo repository.RepoConfig, login, owner, project string) (auth.Credential, error) {
-	for {
-		creds, err := auth.List(repo,
-			auth.WithTarget(target),
-			auth.WithKind(auth.KindToken),
-			auth.WithMeta(auth.MetaKeyLogin, login),
-		)
-		if err != nil {
-			return nil, err
-		}
-
-		fmt.Println()
-		fmt.Println("[1]: enter my token")
-		fmt.Println("[2]: interactive token creation")
-
-		if len(creds) > 0 {
-			sort.Sort(auth.ById(creds))
-
-			fmt.Println()
-			fmt.Println("Existing tokens for Github:")
-			for i, cred := range creds {
-				token := cred.(*auth.Token)
-				fmt.Printf("[%d]: %s => %s (login: %s, %s)\n",
-					i+3,
-					colors.Cyan(token.ID().Human()),
-					colors.Red(text.TruncateMax(token.Value, 10)),
-					token.Metadata()[auth.MetaKeyLogin],
-					token.CreateTime().Format(time.RFC822),
-				)
-			}
-		}
-
-		fmt.Println()
-		fmt.Print("Select option: ")
+	creds, err := auth.List(repo,
+		auth.WithTarget(target),
+		auth.WithKind(auth.KindToken),
+		auth.WithMeta(auth.MetaKeyLogin, login),
+	)
+	if err != nil {
+		return nil, err
+	}
 
-		line, err := bufio.NewReader(os.Stdin).ReadString('\n')
-		fmt.Println()
+	cred, err := input.PromptCredentialWithInteractive(target, "token", creds)
+	switch err {
+	case nil:
+		return cred, nil
+	case input.ErrDirectPrompt:
+		return promptToken()
+	case input.ErrInteractiveCreation:
+		value, err := loginAndRequestToken(login, owner, project)
 		if err != nil {
 			return nil, err
 		}
-
-		line = strings.TrimSpace(line)
-		index, err := strconv.Atoi(line)
-		if err != nil || index < 1 || index > len(creds)+2 {
-			fmt.Println("invalid input")
-			continue
-		}
-
-		switch index {
-		case 1:
-			return promptToken()
-		case 2:
-			value, err := loginAndRequestToken(login, owner, project)
-			if err != nil {
-				return nil, err
-			}
-			token := auth.NewToken(target, value)
-			token.SetMetadata(auth.MetaKeyLogin, login)
-			return token, nil
-		default:
-			return creds[index-3], nil
-		}
+		token := auth.NewToken(target, value)
+		token.SetMetadata(auth.MetaKeyLogin, login)
+		return token, nil
+	default:
+		return nil, err
 	}
 }
 
@@ -413,73 +379,25 @@ func loginAndRequestToken(login, owner, project string) (string, error) {
 }
 
 func promptURL(repo repository.RepoCommon) (string, string, error) {
-	// remote suggestions
-	remotes, err := repo.GetRemotes()
+	validRemotes, err := getValidGithubRemoteURLs(repo)
 	if err != nil {
 		return "", "", err
 	}
 
-	validRemotes := getValidGithubRemoteURLs(remotes)
-	if len(validRemotes) > 0 {
-		for {
-			fmt.Println("\nDetected projects:")
-
-			// print valid remote github urls
-			for i, remote := range validRemotes {
-				fmt.Printf("[%d]: %v\n", i+1, remote)
-			}
-
-			fmt.Printf("\n[0]: Another project\n\n")
-			fmt.Printf("Select option: ")
-
-			line, err := bufio.NewReader(os.Stdin).ReadString('\n')
-			if err != nil {
-				return "", "", err
-			}
-
-			line = strings.TrimSpace(line)
-
-			index, err := strconv.Atoi(line)
-			if err != nil || index < 0 || index > len(validRemotes) {
-				fmt.Println("invalid input")
-				continue
-			}
-
-			// if user want to enter another project url break this loop
-			if index == 0 {
-				break
-			}
-
-			// get owner and project with index
-			owner, project, _ := splitURL(validRemotes[index-1])
-			return owner, project, nil
-		}
-	}
-
-	// manually enter github url
-	for {
-		fmt.Print("Github project URL: ")
-
-		line, err := bufio.NewReader(os.Stdin).ReadString('\n')
-		if err != nil {
-			return "", "", err
-		}
-
-		line = strings.TrimSpace(line)
-		if line == "" {
-			fmt.Println("URL is empty")
-			continue
-		}
-
-		// get owner and project from url
-		owner, project, err := splitURL(line)
+	validator := func(name, value string) (string, error) {
+		_, _, err := splitURL(value)
 		if err != nil {
-			fmt.Println(err)
-			continue
+			return err.Error(), nil
 		}
+		return "", nil
+	}
 
-		return owner, project, nil
+	url, err := input.PromptURLWithRemote("Github project URL", "URL", validRemotes, input.Required, validator)
+	if err != nil {
+		return "", "", err
 	}
+
+	return splitURL(url)
 }
 
 // splitURL extract the owner and project from a github repository URL. It will remove the
@@ -488,10 +406,7 @@ func promptURL(repo repository.RepoCommon) (string, string, error) {
 func splitURL(url string) (owner string, project string, err error) {
 	cleanURL := strings.TrimSuffix(url, ".git")
 
-	re, err := regexp.Compile(`github\.com[/:]([a-zA-Z0-9\-_]+)/([a-zA-Z0-9\-_.]+)`)
-	if err != nil {
-		panic("regexp compile:" + err.Error())
-	}
+	re := regexp.MustCompile(`github\.com[/:]([a-zA-Z0-9\-_]+)/([a-zA-Z0-9\-_.]+)`)
 
 	res := re.FindStringSubmatch(cleanURL)
 	if res == nil {
@@ -503,7 +418,12 @@ func splitURL(url string) (owner string, project string, err error) {
 	return
 }
 
-func getValidGithubRemoteURLs(remotes map[string]string) []string {
+func getValidGithubRemoteURLs(repo repository.RepoCommon) ([]string, error) {
+	remotes, err := repo.GetRemotes()
+	if err != nil {
+		return nil, err
+	}
+
 	urls := make([]string, 0, len(remotes))
 	for _, url := range remotes {
 		// split url can work again with shortURL
@@ -516,7 +436,7 @@ func getValidGithubRemoteURLs(remotes map[string]string) []string {
 
 	sort.Strings(urls)
 
-	return urls
+	return urls, nil
 }
 
 func validateUsername(username string) (bool, error) {
diff --git a/bridge/github/export.go b/bridge/github/export.go
index c363e188..6cee4188 100644
--- a/bridge/github/export.go
+++ b/bridge/github/export.go
@@ -139,8 +139,8 @@ func (ge *githubExporter) ExportAll(ctx context.Context, repo *cache.RepoCache,
 	ge.repositoryID, err = getRepositoryNodeID(
 		ctx,
 		ge.defaultToken,
-		ge.conf[keyOwner],
-		ge.conf[keyProject],
+		ge.conf[confKeyOwner],
+		ge.conf[confKeyProject],
 	)
 	if err != nil {
 		return nil, err
@@ -187,7 +187,7 @@ func (ge *githubExporter) ExportAll(ctx context.Context, repo *cache.RepoCache,
 
 				if snapshot.HasAnyActor(allIdentitiesIds...) {
 					// try to export the bug and it associated events
-					ge.exportBug(ctx, b, since, out)
+					ge.exportBug(ctx, b, out)
 				}
 			}
 		}
@@ -197,7 +197,7 @@ func (ge *githubExporter) ExportAll(ctx context.Context, repo *cache.RepoCache,
 }
 
 // exportBug publish bugs and related events
-func (ge *githubExporter) exportBug(ctx context.Context, b *cache.BugCache, since time.Time, out chan<- core.ExportResult) {
+func (ge *githubExporter) exportBug(ctx context.Context, b *cache.BugCache, out chan<- core.ExportResult) {
 	snapshot := b.Snapshot()
 	var bugUpdated bool
 
@@ -238,7 +238,7 @@ func (ge *githubExporter) exportBug(ctx context.Context, b *cache.BugCache, sinc
 		}
 
 		// ignore issue coming from other repositories
-		if owner != ge.conf[keyOwner] && project != ge.conf[keyProject] {
+		if owner != ge.conf[confKeyOwner] && project != ge.conf[confKeyProject] {
 			out <- core.NewExportNothing(b.Id(), fmt.Sprintf("skipping issue from url:%s", githubURL))
 			return
 		}
@@ -481,8 +481,8 @@ func markOperationAsExported(b *cache.BugCache, target entity.Id, githubID, gith
 
 func (ge *githubExporter) cacheGithubLabels(ctx context.Context, gc *githubv4.Client) error {
 	variables := map[string]interface{}{
-		"owner": githubv4.String(ge.conf[keyOwner]),
-		"name":  githubv4.String(ge.conf[keyProject]),
+		"owner": githubv4.String(ge.conf[confKeyOwner]),
+		"name":  githubv4.String(ge.conf[confKeyProject]),
 		"first": githubv4.Int(10),
 		"after": (*githubv4.String)(nil),
 	}
@@ -526,7 +526,7 @@ func (ge *githubExporter) getLabelID(gc *githubv4.Client, label string) (string,
 // NOTE: since createLabel mutation is still in preview mode we use github api v3 to create labels
 // see https://developer.github.com/v4/mutation/createlabel/ and https://developer.github.com/v4/previews/#labels-preview
 func (ge *githubExporter) createGithubLabel(ctx context.Context, label, color string) (string, error) {
-	url := fmt.Sprintf("%s/repos/%s/%s/labels", githubV3Url, ge.conf[keyOwner], ge.conf[keyProject])
+	url := fmt.Sprintf("%s/repos/%s/%s/labels", githubV3Url, ge.conf[confKeyOwner], ge.conf[confKeyProject])
 	client := &http.Client{}
 
 	params := struct {
diff --git a/bridge/github/export_test.go b/bridge/github/export_test.go
index 56e29835..a25d56d7 100644
--- a/bridge/github/export_test.go
+++ b/bridge/github/export_test.go
@@ -188,8 +188,8 @@ func TestPushPull(t *testing.T) {
 	// initialize exporter
 	exporter := &githubExporter{}
 	err = exporter.Init(backend, core.Configuration{
-		keyOwner:   envUser,
-		keyProject: projectName,
+		confKeyOwner:   envUser,
+		confKeyProject: projectName,
 	})
 	require.NoError(t, err)
 
@@ -216,8 +216,8 @@ func TestPushPull(t *testing.T) {
 
 	importer := &githubImporter{}
 	err = importer.Init(backend, core.Configuration{
-		keyOwner:   envUser,
-		keyProject: projectName,
+		confKeyOwner:   envUser,
+		confKeyProject: projectName,
 	})
 	require.NoError(t, err)
 
diff --git a/bridge/github/github.go b/bridge/github/github.go
index 19dc8a08..a02d9460 100644
--- a/bridge/github/github.go
+++ b/bridge/github/github.go
@@ -19,8 +19,8 @@ const (
 	metaKeyGithubUrl   = "github-url"
 	metaKeyGithubLogin = "github-login"
 
-	keyOwner   = "owner"
-	keyProject = "project"
+	confKeyOwner   = "owner"
+	confKeyProject = "project"
 
 	githubV3Url    = "https://api.github.com"
 	defaultTimeout = 60 * time.Second
@@ -30,7 +30,7 @@ var _ core.BridgeImpl = &Github{}
 
 type Github struct{}
 
-func (*Github) Target() string {
+func (Github) Target() string {
 	return target
 }
 
@@ -38,11 +38,11 @@ func (g *Github) LoginMetaKey() string {
 	return metaKeyGithubLogin
 }
 
-func (*Github) NewImporter() core.Importer {
+func (Github) NewImporter() core.Importer {
 	return &githubImporter{}
 }
 
-func (*Github) NewExporter() core.Exporter {
+func (Github) NewExporter() core.Exporter {
 	return &githubExporter{}
 }
 
diff --git a/bridge/github/import.go b/bridge/github/import.go
index ea0ccba3..3267c013 100644
--- a/bridge/github/import.go
+++ b/bridge/github/import.go
@@ -49,7 +49,7 @@ func (gi *githubImporter) Init(repo *cache.RepoCache, conf core.Configuration) e
 // ImportAll iterate over all the configured repository issues and ensure the creation of the
 // missing issues / timeline items / edits / label events ...
 func (gi *githubImporter) ImportAll(ctx context.Context, repo *cache.RepoCache, since time.Time) (<-chan core.ImportResult, error) {
-	gi.iterator = NewIterator(ctx, gi.client, 10, gi.conf[keyOwner], gi.conf[keyProject], since)
+	gi.iterator = NewIterator(ctx, gi.client, 10, gi.conf[confKeyOwner], gi.conf[confKeyProject], since)
 	out := make(chan core.ImportResult)
 	gi.out = out
 
diff --git a/bridge/github/import_test.go b/bridge/github/import_test.go
index 7eb901d3..4f75f368 100644
--- a/bridge/github/import_test.go
+++ b/bridge/github/import_test.go
@@ -151,8 +151,8 @@ func Test_Importer(t *testing.T) {
 
 	importer := &githubImporter{}
 	err = importer.Init(backend, core.Configuration{
-		keyOwner:   "MichaelMure",
-		keyProject: "git-bug-test-github-bridge",
+		confKeyOwner:   "MichaelMure",
+		confKeyProject: "git-bug-test-github-bridge",
 	})
 	require.NoError(t, err)
 
diff --git a/bridge/gitlab/config.go b/bridge/gitlab/config.go
index 9bd9c3c7..94026635 100644
--- a/bridge/gitlab/config.go
+++ b/bridge/gitlab/config.go
@@ -1,18 +1,13 @@
 package gitlab
 
 import (
-	"bufio"
 	"fmt"
 	"net/url"
-	"os"
 	"path"
 	"regexp"
-	"sort"
 	"strconv"
 	"strings"
-	"time"
 
-	text "github.com/MichaelMure/go-term-text"
 	"github.com/pkg/errors"
 	"github.com/xanzy/go-gitlab"
 
@@ -21,22 +16,23 @@ import (
 	"github.com/MichaelMure/git-bug/cache"
 	"github.com/MichaelMure/git-bug/input"
 	"github.com/MichaelMure/git-bug/repository"
-	"github.com/MichaelMure/git-bug/util/colors"
 )
 
 var (
 	ErrBadProjectURL = errors.New("bad project url")
 )
 
-func (g *Gitlab) Configure(repo *cache.RepoCache, params core.BridgeParams) (core.Configuration, error) {
-	if params.Project != "" {
-		fmt.Println("warning: --project is ineffective for a gitlab bridge")
-	}
-	if params.Owner != "" {
-		fmt.Println("warning: --owner is ineffective for a gitlab bridge")
+func (g *Gitlab) ValidParams() map[string]interface{} {
+	return map[string]interface{}{
+		"URL":        nil,
+		"BaseURL":    nil,
+		"Login":      nil,
+		"CredPrefix": nil,
+		"TokenRaw":   nil,
 	}
+}
 
-	conf := make(core.Configuration)
+func (g *Gitlab) Configure(repo *cache.RepoCache, params core.BridgeParams) (core.Configuration, error) {
 	var err error
 	var baseUrl string
 
@@ -44,7 +40,7 @@ func (g *Gitlab) Configure(repo *cache.RepoCache, params core.BridgeParams) (cor
 	case params.BaseURL != "":
 		baseUrl = params.BaseURL
 	default:
-		baseUrl, err = promptBaseUrlOptions()
+		baseUrl, err = input.PromptDefault("Gitlab server URL", "URL", defaultBaseURL, input.Required, input.IsURL)
 		if err != nil {
 			return nil, errors.Wrap(err, "base url prompt")
 		}
@@ -117,9 +113,10 @@ func (g *Gitlab) Configure(repo *cache.RepoCache, params core.BridgeParams) (cor
 		return nil, errors.Wrap(err, "project validation")
 	}
 
+	conf := make(core.Configuration)
 	conf[core.ConfigKeyTarget] = target
-	conf[keyProjectID] = strconv.Itoa(id)
-	conf[keyGitlabBaseUrl] = baseUrl
+	conf[confKeyProjectID] = strconv.Itoa(id)
+	conf[confKeyGitlabBaseUrl] = baseUrl
 
 	err = g.ValidateConfig(conf)
 	if err != nil {
@@ -143,107 +140,35 @@ func (g *Gitlab) ValidateConfig(conf core.Configuration) error {
 	} else if v != target {
 		return fmt.Errorf("unexpected target name: %v", v)
 	}
-	if _, ok := conf[keyGitlabBaseUrl]; !ok {
-		return fmt.Errorf("missing %s key", keyGitlabBaseUrl)
+	if _, ok := conf[confKeyGitlabBaseUrl]; !ok {
+		return fmt.Errorf("missing %s key", confKeyGitlabBaseUrl)
 	}
-	if _, ok := conf[keyProjectID]; !ok {
-		return fmt.Errorf("missing %s key", keyProjectID)
+	if _, ok := conf[confKeyProjectID]; !ok {
+		return fmt.Errorf("missing %s key", confKeyProjectID)
 	}
 
 	return nil
 }
 
-func promptBaseUrlOptions() (string, error) {
-	index, err := input.PromptChoice("Gitlab base url", []string{
-		"https://gitlab.com",
-		"enter your own base url",
-	})
-
+func promptTokenOptions(repo repository.RepoConfig, login, baseUrl string) (auth.Credential, error) {
+	creds, err := auth.List(repo,
+		auth.WithTarget(target),
+		auth.WithKind(auth.KindToken),
+		auth.WithMeta(auth.MetaKeyLogin, login),
+		auth.WithMeta(auth.MetaKeyBaseURL, baseUrl),
+	)
 	if err != nil {
-		return "", err
-	}
-
-	if index == 0 {
-		return defaultBaseURL, nil
-	} else {
-		return promptBaseUrl()
-	}
-}
-
-func promptBaseUrl() (string, error) {
-	validator := func(name string, value string) (string, error) {
-		u, err := url.Parse(value)
-		if err != nil {
-			return err.Error(), nil
-		}
-		if u.Scheme == "" {
-			return "missing scheme", nil
-		}
-		if u.Host == "" {
-			return "missing host", nil
-		}
-		return "", nil
+		return nil, err
 	}
 
-	return input.Prompt("Base url", "url", input.Required, validator)
-}
-
-func promptTokenOptions(repo repository.RepoConfig, login, baseUrl string) (auth.Credential, error) {
-	for {
-		creds, err := auth.List(repo,
-			auth.WithTarget(target),
-			auth.WithKind(auth.KindToken),
-			auth.WithMeta(auth.MetaKeyLogin, login),
-			auth.WithMeta(auth.MetaKeyBaseURL, baseUrl),
-		)
-		if err != nil {
-			return nil, err
-		}
-
-		// if we don't have existing token, fast-track to the token prompt
-		if len(creds) == 0 {
-			return promptToken(baseUrl)
-		}
-
-		fmt.Println()
-		fmt.Println("[1]: enter my token")
-
-		fmt.Println()
-		fmt.Println("Existing tokens for Gitlab:")
-
-		sort.Sort(auth.ById(creds))
-		for i, cred := range creds {
-			token := cred.(*auth.Token)
-			fmt.Printf("[%d]: %s => %s (%s)\n",
-				i+2,
-				colors.Cyan(token.ID().Human()),
-				colors.Red(text.TruncateMax(token.Value, 10)),
-				token.CreateTime().Format(time.RFC822),
-			)
-		}
-
-		fmt.Println()
-		fmt.Print("Select option: ")
-
-		line, err := bufio.NewReader(os.Stdin).ReadString('\n')
-		fmt.Println()
-		if err != nil {
-			return nil, err
-		}
-
-		line = strings.TrimSpace(line)
-		index, err := strconv.Atoi(line)
-		if err != nil || index < 1 || index > len(creds)+1 {
-			fmt.Println("invalid input")
-			continue
-		}
-
-		switch index {
-		case 1:
-			return promptToken(baseUrl)
-		default:
-			return creds[index-2], nil
-		}
+	cred, err := input.PromptCredential(target, "token", creds)
+	switch err {
+	case nil:
+		return cred, nil
+	case input.ErrDirectPrompt:
+		return promptToken(baseUrl)
+	default:
+		return nil, err
 	}
 }
 
@@ -285,64 +210,12 @@ func promptToken(baseUrl string) (*auth.Token, error) {
 }
 
 func promptProjectURL(repo repository.RepoCommon, baseUrl string) (string, error) {
-	// remote suggestions
-	remotes, err := repo.GetRemotes()
+	validRemotes, err := getValidGitlabRemoteURLs(repo, baseUrl)
 	if err != nil {
-		return "", errors.Wrap(err, "getting remotes")
-	}
-
-	validRemotes := getValidGitlabRemoteURLs(baseUrl, remotes)
-	if len(validRemotes) > 0 {
-		for {
-			fmt.Println("\nDetected projects:")
-
-			// print valid remote gitlab urls
-			for i, remote := range validRemotes {
-				fmt.Printf("[%d]: %v\n", i+1, remote)
-			}
-
-			fmt.Printf("\n[0]: Another project\n\n")
-			fmt.Printf("Select option: ")
-
-			line, err := bufio.NewReader(os.Stdin).ReadString('\n')
-			if err != nil {
-				return "", err
-			}
-
-			line = strings.TrimSpace(line)
-
-			index, err := strconv.Atoi(line)
-			if err != nil || index < 0 || index > len(validRemotes) {
-				fmt.Println("invalid input")
-				continue
-			}
-
-			// if user want to enter another project url break this loop
-			if index == 0 {
-				break
-			}
-
-			return validRemotes[index-1], nil
-		}
+		return "", err
 	}
 
-	// manually enter gitlab url
-	for {
-		fmt.Print("Gitlab project URL: ")
-
-		line, err := bufio.NewReader(os.Stdin).ReadString('\n')
-		if err != nil {
-			return "", err
-		}
-
-		projectURL := strings.TrimSpace(line)
-		if projectURL == "" {
-			fmt.Println("URL is empty")
-			continue
-		}
-
-		return projectURL, nil
-	}
+	return input.PromptURLWithRemote("Gitlab project URL", "URL", validRemotes, input.Required)
 }
 
 func getProjectPath(baseUrl, projectUrl string) (string, error) {
@@ -364,7 +237,12 @@ func getProjectPath(baseUrl, projectUrl string) (string, error) {
 	return objectUrl.Path[1:], nil
 }
 
-func getValidGitlabRemoteURLs(baseUrl string, remotes map[string]string) []string {
+func getValidGitlabRemoteURLs(repo repository.RepoCommon, baseUrl string) ([]string, error) {
+	remotes, err := repo.GetRemotes()
+	if err != nil {
+		return nil, err
+	}
+
 	urls := make([]string, 0, len(remotes))
 	for _, u := range remotes {
 		path, err := getProjectPath(baseUrl, u)
@@ -375,7 +253,7 @@ func getValidGitlabRemoteURLs(baseUrl string, remotes map[string]string) []strin
 		urls = append(urls, fmt.Sprintf("%s/%s", baseUrl, path))
 	}
 
-	return urls
+	return urls, nil
 }
 
 func validateProjectURL(baseUrl, url string, token *auth.Token) (int, error) {
diff --git a/bridge/gitlab/export.go b/bridge/gitlab/export.go
index d747c6ac..156aabaa 100644
--- a/bridge/gitlab/export.go
+++ b/bridge/gitlab/export.go
@@ -44,10 +44,10 @@ func (ge *gitlabExporter) Init(repo *cache.RepoCache, conf core.Configuration) e
 	ge.cachedOperationIDs = make(map[string]string)
 
 	// get repository node id
-	ge.repositoryID = ge.conf[keyProjectID]
+	ge.repositoryID = ge.conf[confKeyProjectID]
 
 	// preload all clients
-	err := ge.cacheAllClient(repo, ge.conf[keyGitlabBaseUrl])
+	err := ge.cacheAllClient(repo, ge.conf[confKeyGitlabBaseUrl])
 	if err != nil {
 		return err
 	}
@@ -81,7 +81,7 @@ func (ge *gitlabExporter) cacheAllClient(repo *cache.RepoCache, baseURL string)
 		}
 
 		if _, ok := ge.identityClient[user.Id()]; !ok {
-			client, err := buildClient(ge.conf[keyGitlabBaseUrl], creds[0].(*auth.Token))
+			client, err := buildClient(ge.conf[confKeyGitlabBaseUrl], creds[0].(*auth.Token))
 			if err != nil {
 				return err
 			}
@@ -138,7 +138,7 @@ func (ge *gitlabExporter) ExportAll(ctx context.Context, repo *cache.RepoCache,
 
 				if snapshot.HasAnyActor(allIdentitiesIds...) {
 					// try to export the bug and it associated events
-					ge.exportBug(ctx, b, since, out)
+					ge.exportBug(ctx, b, out)
 				}
 			}
 		}
@@ -148,7 +148,7 @@ func (ge *gitlabExporter) ExportAll(ctx context.Context, repo *cache.RepoCache,
 }
 
 // exportBug publish bugs and related events
-func (ge *gitlabExporter) exportBug(ctx context.Context, b *cache.BugCache, since time.Time, out chan<- core.ExportResult) {
+func (ge *gitlabExporter) exportBug(ctx context.Context, b *cache.BugCache, out chan<- core.ExportResult) {
 	snapshot := b.Snapshot()
 
 	var bugUpdated bool
@@ -177,7 +177,7 @@ func (ge *gitlabExporter) exportBug(ctx context.Context, b *cache.BugCache, sinc
 	gitlabID, ok := snapshot.GetCreateMetadata(metaKeyGitlabId)
 	if ok {
 		gitlabBaseUrl, ok := snapshot.GetCreateMetadata(metaKeyGitlabBaseUrl)
-		if ok && gitlabBaseUrl != ge.conf[keyGitlabBaseUrl] {
+		if ok && gitlabBaseUrl != ge.conf[confKeyGitlabBaseUrl] {
 			out <- core.NewExportNothing(b.Id(), "skipping issue imported from another Gitlab instance")
 			return
 		}
@@ -189,7 +189,7 @@ func (ge *gitlabExporter) exportBug(ctx context.Context, b *cache.BugCache, sinc
 			return
 		}
 
-		if projectID != ge.conf[keyProjectID] {
+		if projectID != ge.conf[confKeyProjectID] {
 			out <- core.NewExportNothing(b.Id(), "skipping issue imported from another repository")
 			return
 		}
diff --git a/bridge/gitlab/export_test.go b/bridge/gitlab/export_test.go
index 768b899c..5fbb392f 100644
--- a/bridge/gitlab/export_test.go
+++ b/bridge/gitlab/export_test.go
@@ -194,8 +194,8 @@ func TestPushPull(t *testing.T) {
 	// initialize exporter
 	exporter := &gitlabExporter{}
 	err = exporter.Init(backend, core.Configuration{
-		keyProjectID:     strconv.Itoa(projectID),
-		keyGitlabBaseUrl: defaultBaseURL,
+		confKeyProjectID:     strconv.Itoa(projectID),
+		confKeyGitlabBaseUrl: defaultBaseURL,
 	})
 	require.NoError(t, err)
 
@@ -222,8 +222,8 @@ func TestPushPull(t *testing.T) {
 
 	importer := &gitlabImporter{}
 	err = importer.Init(backend, core.Configuration{
-		keyProjectID:     strconv.Itoa(projectID),
-		keyGitlabBaseUrl: defaultBaseURL,
+		confKeyProjectID:     strconv.Itoa(projectID),
+		confKeyGitlabBaseUrl: defaultBaseURL,
 	})
 	require.NoError(t, err)
 
diff --git a/bridge/gitlab/gitlab.go b/bridge/gitlab/gitlab.go
index 8512379c..ec7b7e57 100644
--- a/bridge/gitlab/gitlab.go
+++ b/bridge/gitlab/gitlab.go
@@ -19,8 +19,8 @@ const (
 	metaKeyGitlabProject = "gitlab-project-id"
 	metaKeyGitlabBaseUrl = "gitlab-base-url"
 
-	keyProjectID     = "project-id"
-	keyGitlabBaseUrl = "base-url"
+	confKeyProjectID     = "project-id"
+	confKeyGitlabBaseUrl = "base-url"
 
 	defaultBaseURL = "https://gitlab.com/"
 	defaultTimeout = 60 * time.Second
@@ -30,7 +30,7 @@ var _ core.BridgeImpl = &Gitlab{}
 
 type Gitlab struct{}
 
-func (*Gitlab) Target() string {
+func (Gitlab) Target() string {
 	return target
 }
 
@@ -38,11 +38,11 @@ func (g *Gitlab) LoginMetaKey() string {
 	return metaKeyGitlabLogin
 }
 
-func (*Gitlab) NewImporter() core.Importer {
+func (Gitlab) NewImporter() core.Importer {
 	return &gitlabImporter{}
 }
 
-func (*Gitlab) NewExporter() core.Exporter {
+func (Gitlab) NewExporter() core.Exporter {
 	return &gitlabExporter{}
 }
 
diff --git a/bridge/gitlab/import.go b/bridge/gitlab/import.go
index 4fccb47e..c8d74bef 100644
--- a/bridge/gitlab/import.go
+++ b/bridge/gitlab/import.go
@@ -36,7 +36,7 @@ func (gi *gitlabImporter) Init(repo *cache.RepoCache, conf core.Configuration) e
 	creds, err := auth.List(repo,
 		auth.WithTarget(target),
 		auth.WithKind(auth.KindToken),
-		auth.WithMeta(auth.MetaKeyBaseURL, conf[keyGitlabBaseUrl]),
+		auth.WithMeta(auth.MetaKeyBaseURL, conf[confKeyGitlabBaseUrl]),
 	)
 	if err != nil {
 		return err
@@ -46,7 +46,7 @@ func (gi *gitlabImporter) Init(repo *cache.RepoCache, conf core.Configuration) e
 		return ErrMissingIdentityToken
 	}
 
-	gi.client, err = buildClient(conf[keyGitlabBaseUrl], creds[0].(*auth.Token))
+	gi.client, err = buildClient(conf[confKeyGitlabBaseUrl], creds[0].(*auth.Token))
 	if err != nil {
 		return err
 	}
@@ -57,7 +57,7 @@ func (gi *gitlabImporter) Init(repo *cache.RepoCache, conf core.Configuration) e
 // ImportAll iterate over all the configured repository issues (notes) and ensure the creation
 // of the missing issues / comments / label events / title changes ...
 func (gi *gitlabImporter) ImportAll(ctx context.Context, repo *cache.RepoCache, since time.Time) (<-chan core.ImportResult, error) {
-	gi.iterator = NewIterator(ctx, gi.client, 10, gi.conf[keyProjectID], since)
+	gi.iterator = NewIterator(ctx, gi.client, 10, gi.conf[confKeyProjectID], since)
 	out := make(chan core.ImportResult)
 	gi.out = out
 
@@ -147,8 +147,8 @@ func (gi *gitlabImporter) ensureIssue(repo *cache.RepoCache, issue *gitlab.Issue
 			core.MetaKeyOrigin:   target,
 			metaKeyGitlabId:      parseID(issue.IID),
 			metaKeyGitlabUrl:     issue.WebURL,
-			metaKeyGitlabProject: gi.conf[keyProjectID],
-			metaKeyGitlabBaseUrl: gi.conf[keyGitlabBaseUrl],
+			metaKeyGitlabProject: gi.conf[confKeyProjectID],
+			metaKeyGitlabBaseUrl: gi.conf[confKeyGitlabBaseUrl],
 		},
 	)
 
diff --git a/bridge/gitlab/import_test.go b/bridge/gitlab/import_test.go
index 99d0d69e..b70b291e 100644
--- a/bridge/gitlab/import_test.go
+++ b/bridge/gitlab/import_test.go
@@ -106,8 +106,8 @@ func TestImport(t *testing.T) {
 
 	importer := &gitlabImporter{}
 	err = importer.Init(backend, core.Configuration{
-		keyProjectID:     projectID,
-		keyGitlabBaseUrl: defaultBaseURL,
+		confKeyProjectID:     projectID,
+		confKeyGitlabBaseUrl: defaultBaseURL,
 	})
 	require.NoError(t, err)
 
diff --git a/bridge/launchpad/config.go b/bridge/launchpad/config.go
index e029fad3..8567675f 100644
--- a/bridge/launchpad/config.go
+++ b/bridge/launchpad/config.go
@@ -13,18 +13,14 @@ import (
 
 var ErrBadProjectURL = errors.New("bad Launchpad project URL")
 
-func (l *Launchpad) Configure(repo *cache.RepoCache, params core.BridgeParams) (core.Configuration, error) {
-	if params.TokenRaw != "" {
-		fmt.Println("warning: token params are ineffective for a Launchpad bridge")
-	}
-	if params.Owner != "" {
-		fmt.Println("warning: --owner is ineffective for a Launchpad bridge")
-	}
-	if params.BaseURL != "" {
-		fmt.Println("warning: --base-url is ineffective for a Launchpad bridge")
+func (Launchpad) ValidParams() map[string]interface{} {
+	return map[string]interface{}{
+		"URL":     nil,
+		"Project": nil,
 	}
+}
 
-	conf := make(core.Configuration)
+func (l *Launchpad) Configure(repo *cache.RepoCache, params core.BridgeParams) (core.Configuration, error) {
 	var err error
 	var project string
 
@@ -52,8 +48,9 @@ func (l *Launchpad) Configure(repo *cache.RepoCache, params core.BridgeParams) (
 		return nil, fmt.Errorf("project doesn't exist")
 	}
 
+	conf := make(core.Configuration)
 	conf[core.ConfigKeyTarget] = target
-	conf[keyProject] = project
+	conf[confKeyProject] = project
 
 	err = l.ValidateConfig(conf)
 	if err != nil {
@@ -70,8 +67,8 @@ func (*Launchpad) ValidateConfig(conf core.Configuration) error {
 		return fmt.Errorf("unexpected target name: %v", v)
 	}
 
-	if _, ok := conf[keyProject]; !ok {
-		return fmt.Errorf("missing %s key", keyProject)
+	if _, ok := conf[confKeyProject]; !ok {
+		return fmt.Errorf("missing %s key", confKeyProject)
 	}
 
 	return nil
diff --git a/bridge/launchpad/launchpad.go b/bridge/launchpad/launchpad.go
index b4fcdd00..51ee79d2 100644
--- a/bridge/launchpad/launchpad.go
+++ b/bridge/launchpad/launchpad.go
@@ -13,7 +13,7 @@ const (
 	metaKeyLaunchpadID    = "launchpad-id"
 	metaKeyLaunchpadLogin = "launchpad-login"
 
-	keyProject = "project"
+	confKeyProject = "project"
 
 	defaultTimeout = 60 * time.Second
 )
@@ -26,7 +26,7 @@ func (*Launchpad) Target() string {
 	return "launchpad-preview"
 }
 
-func (l *Launchpad) LoginMetaKey() string {
+func (Launchpad) LoginMetaKey() string {
 	return metaKeyLaunchpadLogin
 }