feat(cli): add multi-source resolve lookup helper

README.md

@@ -439,32 +439,20 @@ Les validations sont appliquées de manière cohérente en TTY et en stdin non i
 Pour standardiser la résolution `flag > env > config > secret` avec provenance :
 
 ```go
-lookup := func(source cli.ValueSource, key string) (string, bool, error) {
-	switch source {
-	case cli.SourceFlag:
-		value, ok := flagValues[key]
-		return value, ok, nil
-	case cli.SourceEnv:
-		value, ok := os.LookupEnv(key)
-		return value, ok, nil
-	case cli.SourceConfig:
-		value, ok := configValues[key]
-		return value, ok, nil
-	case cli.SourceSecret:
-		value, err := store.GetSecret(key)
-		switch {
-		case err == nil:
-			return value, true, nil
-		case errors.Is(err, secretstore.ErrNotFound):
-			return "", false, nil
-		default:
-			return "", false, err
-		}
-	default:
-		return "", false, nil
-	}
+store, err := secretstore.OpenFromManifest(secretstore.OpenFromManifestOptions{
+	ServiceName: "my-mcp",
+})
+if err != nil {
+	return err
 }
 
+lookup := cli.ResolveLookup(cli.ResolveLookupOptions{
+	Flag:   cli.MapLookup(flagValues),
+	Env:    cli.EnvLookup(os.LookupEnv),
+	Config: cli.ConfigMap(configValues),
+	Secret: cli.SecretStore(store), // ErrNotFound => valeur absente, pas une erreur
+})
+
 resolution, err := cli.ResolveFields(cli.ResolveOptions{
 	Fields: []cli.FieldSpec{
 		{Name: "base_url", Required: true, FlagKey: "base-url", EnvKey: "MY_MCP_BASE_URL"},

cli/resolve_lookup.go

@@ -0,0 +1,87 @@
+package cli
+
+import (
+	"errors"
+	"os"
+
+	"gitea.lclr.dev/AI/mcp-framework/secretstore"
+)
+
+type KeyLookupFunc func(key string) (string, bool, error)
+
+type ResolveLookupOptions struct {
+	Flag   KeyLookupFunc
+	Env    KeyLookupFunc
+	Config KeyLookupFunc
+	Secret KeyLookupFunc
+}
+
+func ResolveLookup(options ResolveLookupOptions) LookupFunc {
+	return func(source ValueSource, key string) (string, bool, error) {
+		switch source {
+		case SourceFlag:
+			return runKeyLookup(options.Flag, key)
+		case SourceEnv:
+			return runKeyLookup(options.Env, key)
+		case SourceConfig:
+			return runKeyLookup(options.Config, key)
+		case SourceSecret:
+			return runKeyLookup(options.Secret, key)
+		case SourceDefault:
+			return "", false, nil
+		default:
+			return "", false, nil
+		}
+	}
+}
+
+func runKeyLookup(lookup KeyLookupFunc, key string) (string, bool, error) {
+	if lookup == nil {
+		return "", false, nil
+	}
+	if key == "" {
+		return "", false, nil
+	}
+	return lookup(key)
+}
+
+func MapLookup(values map[string]string) KeyLookupFunc {
+	return func(key string) (string, bool, error) {
+		value, ok := values[key]
+		return value, ok, nil
+	}
+}
+
+func EnvLookup(lookup func(string) (string, bool)) KeyLookupFunc {
+	reader := lookup
+	if reader == nil {
+		reader = os.LookupEnv
+	}
+
+	return func(key string) (string, bool, error) {
+		value, ok := reader(key)
+		return value, ok, nil
+	}
+}
+
+func ConfigMap(values map[string]string) KeyLookupFunc {
+	return MapLookup(values)
+}
+
+func SecretStore(store secretstore.Store) KeyLookupFunc {
+	if store == nil {
+		return nil
+	}
+
+	return func(key string) (string, bool, error) {
+		value, err := store.GetSecret(key)
+		switch {
+		case err == nil:
+			return value, true, nil
+		case errors.Is(err, secretstore.ErrNotFound):
+			return "", false, nil
+		default:
+			return "", false, err
+		}
+	}
+}

cli/resolve_lookup_test.go

@@ -0,0 +1,145 @@
+package cli
+
+import (
+	"errors"
+	"testing"
+
+	"gitea.lclr.dev/AI/mcp-framework/secretstore"
+)
+
+type testSecretStore struct {
+	values map[string]string
+	errs   map[string]error
+}
+
+func (s testSecretStore) SetSecret(name, label, secret string) error {
+	return nil
+}
+
+func (s testSecretStore) GetSecret(name string) (string, error) {
+	if err, ok := s.errs[name]; ok {
+		return "", err
+	}
+	value, ok := s.values[name]
+	if !ok {
+		return "", secretstore.ErrNotFound
+	}
+	return value, nil
+}
+
+func (s testSecretStore) DeleteSecret(name string) error {
+	return nil
+}
+
+func TestResolveLookupWithStandardProviders(t *testing.T) {
+	t.Setenv("MCP_PASSWORD", "")
+
+	lookup := ResolveLookup(ResolveLookupOptions{
+		Flag:   MapLookup(map[string]string{"host": "https://flag.example.com"}),
+		Env:    EnvLookup(nil),
+		Config: ConfigMap(map[string]string{"username": "config-user"}),
+		Secret: SecretStore(testSecretStore{
+			values: map[string]string{"smtp-password": "secret-password"},
+		}),
+	})
+
+	resolution, err := ResolveFields(ResolveOptions{
+		Fields: []FieldSpec{
+			{
+				Name:     "host",
+				Required: true,
+				FlagKey:  "host",
+			},
+			{
+				Name:      "username",
+				Required:  true,
+				EnvKey:    "MCP_USERNAME",
+				ConfigKey: "username",
+			},
+			{
+				Name:      "password",
+				Required:  true,
+				EnvKey:    "MCP_PASSWORD",
+				SecretKey: "smtp-password",
+			},
+		},
+		Lookup: lookup,
+	})
+	if err != nil {
+		t.Fatalf("ResolveFields returned error: %v", err)
+	}
+
+	host, _ := resolution.Get("host")
+	if host.Source != SourceFlag || host.Value != "https://flag.example.com" {
+		t.Fatalf("host = %+v", host)
+	}
+
+	username, _ := resolution.Get("username")
+	if username.Source != SourceConfig || username.Value != "config-user" {
+		t.Fatalf("username = %+v", username)
+	}
+
+	password, _ := resolution.Get("password")
+	if password.Source != SourceSecret || password.Value != "secret-password" {
+		t.Fatalf("password = %+v", password)
+	}
+}
+
+func TestSecretStoreProviderTreatsErrNotFoundAsMissing(t *testing.T) {
+	lookup := ResolveLookup(ResolveLookupOptions{
+		Secret: SecretStore(testSecretStore{
+			errs: map[string]error{"smtp-password": secretstore.ErrNotFound},
+		}),
+	})
+
+	resolution, err := ResolveFields(ResolveOptions{
+		Fields: []FieldSpec{
+			{
+				Name:         "password",
+				Required:     true,
+				SecretKey:    "smtp-password",
+				DefaultValue: "fallback-password",
+			},
+		},
+		Lookup: lookup,
+	})
+	if err != nil {
+		t.Fatalf("ResolveFields returned error: %v", err)
+	}
+
+	password, _ := resolution.Get("password")
+	if password.Source != SourceDefault || password.Value != "fallback-password" {
+		t.Fatalf("password = %+v", password)
+	}
+}
+
+func TestSecretStoreProviderPropagatesBackendErrors(t *testing.T) {
+	backendErr := errors.New("backend unavailable")
+	lookup := ResolveLookup(ResolveLookupOptions{
+		Secret: SecretStore(testSecretStore{
+			errs: map[string]error{"smtp-password": backendErr},
+		}),
+	})
+
+	_, err := ResolveFields(ResolveOptions{
+		Fields: []FieldSpec{
+			{
+				Name:      "password",
+				Required:  true,
+				SecretKey: "smtp-password",
+			},
+		},
+		Lookup: lookup,
+	})
+
+	var sourceErr *SourceLookupError
+	if !errors.As(err, &sourceErr) {
+		t.Fatalf("ResolveFields error = %v, want SourceLookupError", err)
+	}
+	if sourceErr.Source != SourceSecret {
+		t.Fatalf("sourceErr.Source = %q, want %q", sourceErr.Source, SourceSecret)
+	}
+	if !errors.Is(err, backendErr) {
+		t.Fatalf("ResolveFields error should wrap backend error")
+	}
+}