feat(oauth): use oauth device flow to authenticate with predefined src-cli OAuth client

cmd/src/login.go

@@ -6,18 +6,22 @@ import (
 	"fmt"
 	"io"
 	"os"
+	"os/exec"
+	"runtime"
 	"strings"
+	"time"
 
 	"github.com/sourcegraph/src-cli/internal/api"
 	"github.com/sourcegraph/src-cli/internal/cmderrors"
+	"github.com/sourcegraph/src-cli/internal/oauth"
 )
 
 func init() {
 	usage := `'src login' helps you authenticate 'src' to access a Sourcegraph instance with your user credentials.
 
 Usage:
 
-    src login SOURCEGRAPH_URL
+    src login [flags] SOURCEGRAPH_URL
 
 Examples:
 
@@ -28,6 +32,15 @@ Examples:
   Authenticate to Sourcegraph.com:
 
     $ src login https://sourcegraph.com
+
+  Use OAuth device flow to authenticate:
+
+    $ src login --oauth https://sourcegraph.com
+
+
+  Override the default client id used during device flow when authenticating:
+
+    $ src login --oauth https://sourcegraph.com
 `
 
 	flagSet := flag.NewFlagSet("login", flag.ExitOnError)
@@ -38,6 +51,7 @@ Examples:
 
 	var (
 		apiFlags = api.NewFlags(flagSet)
+		useOAuth = flagSet.Bool("oauth", false, "Use OAuth device flow to obtain an access token interactively")
 	)
 
 	handler := func(args []string) error {
@@ -54,7 +68,15 @@ Examples:
 
 		client := cfg.apiClient(apiFlags, io.Discard)
 
-		return loginCmd(context.Background(), cfg, client, endpoint, os.Stdout)
+		return loginCmd(context.Background(), loginParams{
+			cfg:              cfg,
+			client:           client,
+			endpoint:         endpoint,
+			out:              os.Stdout,
+			useOAuth:         *useOAuth,
+			apiFlags:         apiFlags,
+			deviceFlowClient: oauth.NewClient(oauth.DefaultClientID),
+		})
 	}
 
 	commands = append(commands, &command{
@@ -64,8 +86,21 @@ Examples:
 	})
 }
 
-func loginCmd(ctx context.Context, cfg *config, client api.Client, endpointArg string, out io.Writer) error {
-	endpointArg = cleanEndpoint(endpointArg)
+type loginParams struct {
+	cfg              *config
+	client           api.Client
+	endpoint         string
+	out              io.Writer
+	useOAuth         bool
+	apiFlags         *api.Flags
+	deviceFlowClient oauth.Client
+}
+
+func loginCmd(ctx context.Context, p loginParams) error {
+	endpointArg := cleanEndpoint(p.endpoint)
+	cfg := p.cfg
+	client := p.client
+	out := p.out
 
 	printProblem := func(problem string) {
 		fmt.Fprintf(out, "❌ Problem: %s\n", problem)
@@ -77,7 +112,9 @@ func loginCmd(ctx context.Context, cfg *config, client api.Client, endpointArg s
    export SRC_ACCESS_TOKEN=(your access token)
 
    To verify that it's working, run the login command again.
-`, endpointArg, endpointArg)
+
+   Alternatively, you can try logging in using OAuth by running: src login --oauth %s
+`, endpointArg, endpointArg, endpointArg)
 
 	if cfg.ConfigFilePath != "" {
 		fmt.Fprintln(out)
@@ -86,7 +123,7 @@ func loginCmd(ctx context.Context, cfg *config, client api.Client, endpointArg s
 
 	noToken := cfg.AccessToken == ""
 	endpointConflict := endpointArg != cfg.Endpoint
-	if noToken || endpointConflict {
+	if !p.useOAuth && (noToken || endpointConflict) {
 		fmt.Fprintln(out)
 		switch {
 		case noToken:
@@ -98,6 +135,30 @@ func loginCmd(ctx context.Context, cfg *config, client api.Client, endpointArg s
 		return cmderrors.ExitCode1
 	}
 
+	if p.useOAuth {
+		token, err := runOAuthDeviceFlow(ctx, endpointArg, out, p.deviceFlowClient)
+		if err != nil {
+			printProblem(fmt.Sprintf("OAuth Device flow authentication failed: %s", err))
+			fmt.Fprintln(out, createAccessTokenMessage)
+			return cmderrors.ExitCode1
+		}
+
+		if err := oauth.StoreToken(ctx, token); err != nil {
+			fmt.Fprintln(out)
+			fmt.Fprintf(out, "⚠️  Warning: Failed to store token in keyring store: %q. Continuing with this session only.\n", err)
+		}
+
+		client = api.NewClient(api.ClientOpts{
+			Endpoint:          cfg.Endpoint,
+			AdditionalHeaders: cfg.AdditionalHeaders,
+			Flags:             p.apiFlags,
+			Out:               out,
+			ProxyURL:          cfg.ProxyURL,
+			ProxyPath:         cfg.ProxyPath,
+			OAuthToken:        token,
+		})
+	}
+
 	// See if the user is already authenticated.
 	query := `query CurrentUser { currentUser { username } }`
 	var result struct {
@@ -122,6 +183,65 @@ func loginCmd(ctx context.Context, cfg *config, client api.Client, endpointArg s
 	}
 	fmt.Fprintln(out)
 	fmt.Fprintf(out, "✔️  Authenticated as %s on %s\n", result.CurrentUser.Username, endpointArg)
+
+	if p.useOAuth {
+		fmt.Fprintln(out)
+		fmt.Fprintf(out, "Authenticated with OAuth credentials")
+	}
+
 	fmt.Fprintln(out)
 	return nil
 }
+
+func runOAuthDeviceFlow(ctx context.Context, endpoint string, out io.Writer, client oauth.Client) (*oauth.Token, error) {
+	authResp, err := client.Start(ctx, endpoint, nil)
+	if err != nil {
+		return nil, err
+	}
+
+	authURL := authResp.VerificationURIComplete
+	msg := fmt.Sprintf("If your browser did not open automatically, visit %s.", authURL)
+	if authURL == "" {
+		authURL = authResp.VerificationURI
+		msg = fmt.Sprintf("If your browser did not open automatically, visit %s and enter the user code %s", authURL, authResp.DeviceCode)
+	}
+	_ = openInBrowser(authURL)
+	fmt.Fprintln(out)
+	fmt.Fprint(out, msg)
+
+	fmt.Fprintln(out)
+	fmt.Fprint(out, "Waiting for authorization...")
+	defer fmt.Fprintf(out, "DONE\n\n")
+
+	interval := time.Duration(authResp.Interval) * time.Second
+	if interval <= 0 {
+		interval = 5 * time.Second
+	}
+
+	resp, err := client.Poll(ctx, endpoint, authResp.DeviceCode, interval, authResp.ExpiresIn)
+	if err != nil {
+		return nil, err
+	}
+
+	token := resp.Token(endpoint)
+	token.ClientID = client.ClientID()
+	return token, nil
+}
+
+func openInBrowser(url string) error {
+	if url == "" {
+		return nil
+	}
+
+	var cmd *exec.Cmd
+	switch runtime.GOOS {
+	case "darwin":
+		cmd = exec.Command("open", url)
+	case "windows":
+		// "start" is a cmd.exe built-in; the empty string is the window title.
+		cmd = exec.Command("cmd", "/c", "start", "", url)
+	default:
+		cmd = exec.Command("xdg-open", url)
+	}
+	return cmd.Run()
+}

cmd/src/login_test.go

@@ -11,14 +11,21 @@ import (
 	"testing"
 
 	"github.com/sourcegraph/src-cli/internal/cmderrors"
+	"github.com/sourcegraph/src-cli/internal/oauth"
 )
 
 func TestLogin(t *testing.T) {
 	check := func(t *testing.T, cfg *config, endpointArg string) (output string, err error) {
 		t.Helper()
 
 		var out bytes.Buffer
-		err = loginCmd(context.Background(), cfg, cfg.apiClient(nil, io.Discard), endpointArg, &out)
+		err = loginCmd(context.Background(), loginParams{
+			cfg:              cfg,
+			client:           cfg.apiClient(nil, io.Discard),
+			endpoint:         endpointArg,
+			out:              &out,
+			deviceFlowClient: oauth.NewClient(oauth.DefaultClientID),
+		})
 		return strings.TrimSpace(out.String()), err
 	}
 
@@ -27,7 +34,7 @@ func TestLogin(t *testing.T) {
 		if err != cmderrors.ExitCode1 {
 			t.Fatal(err)
 		}
-		wantOut := "❌ Problem: No access token is configured.\n\n🛠  To fix: Create an access token by going to https://sourcegraph.example.com/user/settings/tokens, then set the following environment variables in your terminal:\n\n   export SRC_ENDPOINT=https://sourcegraph.example.com\n   export SRC_ACCESS_TOKEN=(your access token)\n\n   To verify that it's working, run the login command again."
+		wantOut := "❌ Problem: No access token is configured.\n\n🛠  To fix: Create an access token by going to https://sourcegraph.example.com/user/settings/tokens, then set the following environment variables in your terminal:\n\n   export SRC_ENDPOINT=https://sourcegraph.example.com\n   export SRC_ACCESS_TOKEN=(your access token)\n\n   To verify that it's working, run the login command again.\n\n   Alternatively, you can try logging in using OAuth by running: src login --oauth https://sourcegraph.example.com"
 		if out != wantOut {
 			t.Errorf("got output %q, want %q", out, wantOut)
 		}
@@ -38,7 +45,7 @@ func TestLogin(t *testing.T) {
 		if err != cmderrors.ExitCode1 {
 			t.Fatal(err)
 		}
-		wantOut := "❌ Problem: No access token is configured.\n\n🛠  To fix: Create an access token by going to https://sourcegraph.example.com/user/settings/tokens, then set the following environment variables in your terminal:\n\n   export SRC_ENDPOINT=https://sourcegraph.example.com\n   export SRC_ACCESS_TOKEN=(your access token)\n\n   To verify that it's working, run the login command again."
+		wantOut := "❌ Problem: No access token is configured.\n\n🛠  To fix: Create an access token by going to https://sourcegraph.example.com/user/settings/tokens, then set the following environment variables in your terminal:\n\n   export SRC_ENDPOINT=https://sourcegraph.example.com\n   export SRC_ACCESS_TOKEN=(your access token)\n\n   To verify that it's working, run the login command again.\n\n   Alternatively, you can try logging in using OAuth by running: src login --oauth https://sourcegraph.example.com"
 		if out != wantOut {
 			t.Errorf("got output %q, want %q", out, wantOut)
 		}
@@ -49,7 +56,7 @@ func TestLogin(t *testing.T) {
 		if err != cmderrors.ExitCode1 {
 			t.Fatal(err)
 		}
-		wantOut := "⚠️  Warning: Configuring src with a JSON file is deprecated. Please migrate to using the env vars SRC_ENDPOINT, SRC_ACCESS_TOKEN, and SRC_PROXY instead, and then remove f. See https://github.com/sourcegraph/src-cli#readme for more information.\n\n❌ Problem: No access token is configured.\n\n🛠  To fix: Create an access token by going to https://example.com/user/settings/tokens, then set the following environment variables in your terminal:\n\n   export SRC_ENDPOINT=https://example.com\n   export SRC_ACCESS_TOKEN=(your access token)\n\n   To verify that it's working, run the login command again."
+		wantOut := "⚠️  Warning: Configuring src with a JSON file is deprecated. Please migrate to using the env vars SRC_ENDPOINT, SRC_ACCESS_TOKEN, and SRC_PROXY instead, and then remove f. See https://github.com/sourcegraph/src-cli#readme for more information.\n\n❌ Problem: No access token is configured.\n\n🛠  To fix: Create an access token by going to https://example.com/user/settings/tokens, then set the following environment variables in your terminal:\n\n   export SRC_ENDPOINT=https://example.com\n   export SRC_ACCESS_TOKEN=(your access token)\n\n   To verify that it's working, run the login command again.\n\n   Alternatively, you can try logging in using OAuth by running: src login --oauth https://example.com"
 		if out != wantOut {
 			t.Errorf("got output %q, want %q", out, wantOut)
 		}
@@ -67,7 +74,7 @@ func TestLogin(t *testing.T) {
 		if err != cmderrors.ExitCode1 {
 			t.Fatal(err)
 		}
-		wantOut := "❌ Problem: Invalid access token.\n\n🛠  To fix: Create an access token by going to $ENDPOINT/user/settings/tokens, then set the following environment variables in your terminal:\n\n   export SRC_ENDPOINT=$ENDPOINT\n   export SRC_ACCESS_TOKEN=(your access token)\n\n   To verify that it's working, run the login command again.\n\n   (If you need to supply custom HTTP request headers, see information about SRC_HEADER_* and SRC_HEADERS env vars at https://github.com/sourcegraph/src-cli/blob/main/AUTH_PROXY.md)"
+		wantOut := "❌ Problem: Invalid access token.\n\n🛠  To fix: Create an access token by going to $ENDPOINT/user/settings/tokens, then set the following environment variables in your terminal:\n\n   export SRC_ENDPOINT=$ENDPOINT\n   export SRC_ACCESS_TOKEN=(your access token)\n\n   To verify that it's working, run the login command again.\n\n   Alternatively, you can try logging in using OAuth by running: src login --oauth $ENDPOINT\n\n   (If you need to supply custom HTTP request headers, see information about SRC_HEADER_* and SRC_HEADERS env vars at https://github.com/sourcegraph/src-cli/blob/main/AUTH_PROXY.md)"
 		wantOut = strings.ReplaceAll(wantOut, "$ENDPOINT", endpoint)
 		if out != wantOut {
 			t.Errorf("got output %q, want %q", out, wantOut)

cmd/src/main.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"context"
 	"encoding/json"
 	"flag"
 	"io"
@@ -15,6 +16,7 @@ import (
 	"github.com/sourcegraph/sourcegraph/lib/errors"
 
 	"github.com/sourcegraph/src-cli/internal/api"
+	"github.com/sourcegraph/src-cli/internal/oauth"
 )
 
 const usageText = `src is a tool that provides access to Sourcegraph instances.
@@ -122,15 +124,24 @@ type config struct {
 
 // apiClient returns an api.Client built from the configuration.
 func (c *config) apiClient(flags *api.Flags, out io.Writer) api.Client {
-	return api.NewClient(api.ClientOpts{
+	opts := api.ClientOpts{
 		Endpoint:          c.Endpoint,
 		AccessToken:       c.AccessToken,
 		AdditionalHeaders: c.AdditionalHeaders,
 		Flags:             flags,
 		Out:               out,
 		ProxyURL:          c.ProxyURL,
 		ProxyPath:         c.ProxyPath,
-	})
+	}
+
+	// Only use OAuth if we do not have SRC_ACCESS_TOKEN set
+	if c.AccessToken == "" {
+		if t, err := oauth.LoadToken(context.Background(), c.Endpoint); err == nil {
+			opts.OAuthToken = t
+		}
+	}
+
+	return api.NewClient(opts)
 }
 
 // readConfig reads the config file from the given path.

go.mod

@@ -30,6 +30,7 @@ require (
 	github.com/sourcegraph/sourcegraph/lib v0.0.0-20240709083501-1af563b61442
 	github.com/stretchr/testify v1.11.1
 	github.com/tliron/glsp v0.2.2
+	github.com/zalando/go-keyring v0.2.6
 	golang.org/x/sync v0.18.0
 	google.golang.org/api v0.256.0
 	google.golang.org/protobuf v1.36.10
@@ -41,6 +42,7 @@ require (
 )
 
 require (
+	al.essio.dev/pkg/shellescape v1.5.1 // indirect
 	cel.dev/expr v0.24.0 // indirect
 	cloud.google.com/go/auth v0.17.0 // indirect
 	cloud.google.com/go/auth/oauth2adapt v0.2.8 // indirect
@@ -64,6 +66,7 @@ require (
 	github.com/clipperhouse/uax29/v2 v2.2.0 // indirect
 	github.com/cncf/xds/go v0.0.0-20250501225837-2ac532fd4443 // indirect
 	github.com/containerd/stargz-snapshotter/estargz v0.14.3 // indirect
+	github.com/danieljoos/wincred v1.2.2 // indirect
 	github.com/distribution/reference v0.6.0 // indirect
 	github.com/docker/cli v24.0.4+incompatible // indirect
 	github.com/docker/distribution v2.8.2+incompatible // indirect
@@ -78,6 +81,7 @@ require (
 	github.com/go-chi/chi/v5 v5.2.2 // indirect
 	github.com/go-jose/go-jose/v4 v4.1.2 // indirect
 	github.com/go-logr/stdr v1.2.2 // indirect
+	github.com/godbus/dbus/v5 v5.1.0 // indirect
 	github.com/gofrs/uuid/v5 v5.0.0 // indirect
 	github.com/google/gnostic-models v0.6.9 // indirect
 	github.com/google/go-containerregistry v0.19.1 // indirect

go.sum

@@ -1,3 +1,5 @@
+al.essio.dev/pkg/shellescape v1.5.1 h1:86HrALUujYS/h+GtqoB26SBEdkWfmMI6FubjXlsXyho=
+al.essio.dev/pkg/shellescape v1.5.1/go.mod h1:6sIqp7X2P6mThCQ7twERpZTuigpr6KbZWtls1U8I890=
 cel.dev/expr v0.24.0 h1:56OvJKSH3hDGL0ml5uSxZmz3/3Pq4tJ+fb1unVLAFcY=
 cel.dev/expr v0.24.0/go.mod h1:hLPLo1W4QUmuYdA72RBX06QTs6MXw941piREPl3Yfiw=
 cloud.google.com/go v0.120.0 h1:wc6bgG9DHyKqF5/vQvX1CiZrtHnxJjBlKUyF9nP6meA=
@@ -139,6 +141,8 @@ github.com/creack/goselect v0.1.2/go.mod h1:a/NhLweNvqIYMuxcMOuWY516Cimucms3DglD
 github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E=
 github.com/creack/pty v1.1.24 h1:bJrF4RRfyJnbTJqzRLHzcGaZK1NeM5kTC9jGgovnR1s=
 github.com/creack/pty v1.1.24/go.mod h1:08sCNb52WyoAwi2QDyzUCTgcvVFhUzewun7wtTfvcwE=
+github.com/danieljoos/wincred v1.2.2 h1:774zMFJrqaeYCK2W57BgAem/MLi6mtSE47MB6BOJ0i0=
+github.com/danieljoos/wincred v1.2.2/go.mod h1:w7w4Utbrz8lqeMbDAK0lkNJUv5sAOkFi7nd/ogr0Uh8=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc h1:U9qPSI2PIWSS1VwoXQT9A3Wy9MM3WgvqSxFWenqJduM=
@@ -212,6 +216,8 @@ github.com/go-task/slim-sprig/v3 v3.0.0 h1:sUs3vkvUymDpBKi3qH1YSqBQk9+9D/8M2mN1v
 github.com/go-task/slim-sprig/v3 v3.0.0/go.mod h1:W848ghGpv3Qj3dhTPRyJypKRiqCdHZiAzKg9hl15HA8=
 github.com/gobwas/glob v0.2.3 h1:A4xDbljILXROh+kObIiy5kIaPYD8e96x1tgBhUI5J+Y=
 github.com/gobwas/glob v0.2.3/go.mod h1:d3Ez4x06l9bZtSvzIay5+Yzi0fmZzPgnTbPcKjJAkT8=
+github.com/godbus/dbus/v5 v5.1.0 h1:4KLkAxT3aOY8Li4FRJe/KvhoNFFxo0m6fNuFUO8QJUk=
+github.com/godbus/dbus/v5 v5.1.0/go.mod h1:xhWf0FNVPg57R7Z0UbKHbJfkEywrmjJnf7w5xrFpKfA=
 github.com/gofrs/flock v0.8.1 h1:+gYjHKf32LDeiEEFhQaotPbLuUXjY5ZqxKgXy7n59aw=
 github.com/gofrs/flock v0.8.1/go.mod h1:F1TvTiK9OcQqauNUHlbJvyl9Qa1QvF/gOUDKA14jxHU=
 github.com/gofrs/uuid/v5 v5.0.0 h1:p544++a97kEL+svbcFbCQVM9KFu0Yo25UoISXGNNH9M=
@@ -243,6 +249,8 @@ github.com/google/pprof v0.0.0-20241029153458-d1b30febd7db h1:097atOisP2aRj7vFgY
 github.com/google/pprof v0.0.0-20241029153458-d1b30febd7db/go.mod h1:vavhavw2zAxS5dIdcRluK6cSGGPlZynqzFM8NdvU144=
 github.com/google/s2a-go v0.1.9 h1:LGD7gtMgezd8a/Xak7mEWL0PjoTQFvpRudN895yqKW0=
 github.com/google/s2a-go v0.1.9/go.mod h1:YA0Ei2ZQL3acow2O62kdp9UlnvMmU7kA6Eutn0dXayM=
+github.com/google/shlex v0.0.0-20191202100458-e7afc7fbc510 h1:El6M4kTTCOh6aBiKaUGG7oYTSPP8MxqL4YI3kZKwcP4=
+github.com/google/shlex v0.0.0-20191202100458-e7afc7fbc510/go.mod h1:pupxD2MaaD3pAXIBCelhxNneeOaAeabZDe5s4K6zSpQ=
 github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
 github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
 github.com/googleapis/enterprise-certificate-proxy v0.3.7 h1:zrn2Ee/nWmHulBx5sAVrGgAa0f2/R35S4DJwfFaUPFQ=
@@ -495,6 +503,8 @@ github.com/yuin/goldmark v1.7.8 h1:iERMLn0/QJeHFhxSt3p6PeN9mGnvIKSpG9YYorDMnic=
 github.com/yuin/goldmark v1.7.8/go.mod h1:uzxRWxtg69N339t3louHJ7+O03ezfj6PlliRlaOzY1E=
 github.com/yuin/goldmark-emoji v1.0.5 h1:EMVWyCGPlXJfUXBXpuMu+ii3TIaxbVBnEX9uaDC4cIk=
 github.com/yuin/goldmark-emoji v1.0.5/go.mod h1:tTkZEbwu5wkPmgTcitqddVxY9osFZiavD+r4AzQrh1U=
+github.com/zalando/go-keyring v0.2.6 h1:r7Yc3+H+Ux0+M72zacZoItR3UDxeWfKTcabvkI8ua9s=
+github.com/zalando/go-keyring v0.2.6/go.mod h1:2TCrxYrbUNYfNS/Kgy/LSrkSQzZ5UPVH85RwfczwvcI=
 github.com/zeebo/errs v1.4.0 h1:XNdoD/RRMKP7HD0UhJnIzUy74ISdGGxURlYG8HSWSfM=
 github.com/zeebo/errs v1.4.0/go.mod h1:sgbWHsvVuTPHcqJJGQ1WhI5KbWlHYz+2+2C/LSEtCw4=
 go.opentelemetry.io/auto/sdk v1.1.0 h1:cH53jehLUN6UFLY71z+NDOiNJqDdPRaXzTel0sJySYA=