feat(k6):Add remote test scripts (#2350)

* Add remote test scripts

* Add basic auth

* Simplify error handling

* Use container reader API

* Use Typed URI + linting/formatting

* Add failing remote test + update docs/comments

* Rename struct + Docs

* Fix doc typo

---------

Co-authored-by: bstrausser <bstrausser@locusrobotics.com>

docs/modules/k6.md

@@ -83,12 +83,26 @@ k6.RunContainer(ctx, WithCmdOptions("--vus=10", "--duration=30s"), k6.WithTestSc
 
 #### WithTestScript
 
-Use the `WithTestScript` option to specify the test script to run. The path to the script must be an absolute path. This option copies the script file to the container and pass it to k6's `run` command. At least one `WithTestScript` option must be specified.
+Use the `WithTestScript` option to specify the test script to run. The path to the script must be an absolute path. This option copies the script file to the container and pass it to k6's `run` command. At least one `WithTestScript` or `WithRemoteTestScript`  option must be specified.
 
 ```golang
 k6.RunContainer(ctx, k6.WithTestScript("/tests/test.js"))
 ```
 
+#### WithRemoteTestScript
+
+Use the `WithRemoteTestScript` option to specify the remote test script to run. The path to the remote script must be a http or https url. Basic authentication is supported. This option performs a HTTP `GET` to copy the remote file locally then copies the script file to the container and pass it to k6's `run` command. The default timeout for the `GET` is 60 seconds. Only javascript, or more specifically `Content-Type:text/javascript` is supported.  At least one `WithTestScript` or `WithRemoteTestScript`  option must be specified.
+
+```golang
+scriptUrl:="https://raw.githubusercontent.com/testcontainers/testcontainers-go/main/modules/k6/scripts/pass.js"
+
+uri, _ := url.Parse(scriptUrl)
+desc := k6.DownloadableFile{Uri: *uri , DownloadDir: t.TempDir()}
+options := k6.WithRemoteTestScript(desc)
+
+k6.RunContainer(ctx, k6.WithCache(), options)
+```
+
 ### Container Methods
 
 The K6 container does not expose any method.

modules/k6/k6.go

@@ -3,8 +3,13 @@ package k6
 import (
 	"context"
 	"fmt"
+	"io"
+	"net/http"
+	"net/url"
 	"os"
+	"path"
 	"path/filepath"
+	"time"
 
 	"github.com/docker/docker/api/types/mount"
 
@@ -17,17 +22,73 @@ type K6Container struct {
 	testcontainers.Container
 }
 
+type DownloadableFile struct {
+	Uri         url.URL
+	DownloadDir string
+	User        string
+	Password    string
+}
+
+func (d *DownloadableFile) getDownloadPath() string {
+	baseName := path.Base(d.Uri.Path)
+	return path.Join(d.DownloadDir, baseName)
+
+}
+
+func downloadFileFromDescription(d DownloadableFile) error {
+
+	client := http.Client{Timeout: time.Second * 60}
+	req, err := http.NewRequest(http.MethodGet, d.Uri.String(), nil)
+	if err != nil {
+		return err
+	}
+
+	req.Header.Set("Content-Type", "text/javascript")
+	// Set up HTTPS request with basic authorization.
+	if d.User != "" && d.Password != "" {
+		req.SetBasicAuth(d.User, d.Password)
+	}
+
+	resp, err := client.Do(req)
+	if err != nil {
+		return err
+	}
+
+	downloadedFile, err := os.Create(d.getDownloadPath())
+	if err != nil {
+		return err
+	}
+	defer downloadedFile.Close()
+
+	_, err = io.Copy(downloadedFile, resp.Body)
+	return err
+
+}
+
 // WithTestScript mounts the given script into the ./test directory in the container
 // and passes it to k6 as the test to run.
 // The path to the script must be an absolute path
 func WithTestScript(scriptPath string) testcontainers.CustomizeRequestOption {
-	return func(req *testcontainers.GenericContainerRequest) {
-		script := filepath.Base(scriptPath)
-		target := "/home/k6x/" + script
+
+	scriptBaseName := filepath.Base(scriptPath)
+	f, err := os.Open(scriptPath)
+	if err != nil {
+		panic("Cannot create reader for test file ")
+	}
+	return WithTestScriptReader(f, scriptBaseName)
+
+}
+
+// WithTestScriptReader copies files into the Container using the Reader API
+// The script base name is not a path, neither absolute or relative and should
+// be just the file name of the script
+func WithTestScriptReader(reader io.Reader, scriptBaseName string) testcontainers.CustomizeRequestOption {
+	opt := func(req *testcontainers.GenericContainerRequest) {
+		target := "/home/k6x/" + scriptBaseName
 		req.Files = append(
 			req.Files,
 			testcontainers.ContainerFile{
-				HostFilePath:      scriptPath,
+				Reader:            reader,
 				ContainerFilePath: target,
 				FileMode:          0o644,
 			},
@@ -36,6 +97,18 @@ func WithTestScript(scriptPath string) testcontainers.CustomizeRequestOption {
 		// add script to the k6 run command
 		req.Cmd = append(req.Cmd, target)
 	}
+	return opt
+}
+
+// WithRemoteTestScript takes a RemoteTestFileDescription and copies to container
+func WithRemoteTestScript(d DownloadableFile) testcontainers.CustomizeRequestOption {
+
+	err := downloadFileFromDescription(d)
+	if err != nil {
+		panic("Not able to download required test script")
+	}
+
+	return WithTestScript(d.getDownloadPath())
 }
 
 // WithCmdOptions pass the given options to the k6 run command

modules/k6/k6_test.go

@@ -2,9 +2,12 @@ package k6_test
 
 import (
 	"context"
+	"net/url"
 	"path/filepath"
+	"strings"
 	"testing"
 
+	"github.com/testcontainers/testcontainers-go"
 	"github.com/testcontainers/testcontainers-go/modules/k6"
 )
 
@@ -24,19 +27,42 @@ func TestK6(t *testing.T) {
 			script: "fail.js",
 			expect: 108,
 		},
+		{
+			title:  "Passing remote test",
+			script: "https://raw.githubusercontent.com/testcontainers/testcontainers-go/main/modules/k6/scripts/pass.js",
+			expect: 0,
+		},
+		{
+			title:  "Failing remote test",
+			script: "https://raw.githubusercontent.com/testcontainers/testcontainers-go/main/modules/k6/scripts/fail.js",
+			expect: 108,
+		},
 	}
 
 	for _, tc := range testCases {
 		tc := tc
 		t.Run(tc.title, func(t *testing.T) {
 			ctx := context.Background()
 
-			absPath, err := filepath.Abs(filepath.Join("scripts", tc.script))
-			if err != nil {
-				t.Fatal(err)
+			var options testcontainers.CustomizeRequestOption
+			if !strings.HasPrefix(tc.script, "http") {
+				absPath, err := filepath.Abs(filepath.Join("scripts", tc.script))
+				if err != nil {
+					t.Fatal(err)
+				}
+				options = k6.WithTestScript(absPath)
+			} else {
+
+				uri, err := url.Parse(tc.script)
+				if err != nil {
+					t.Fatal(err)
+				}
+
+				desc := k6.DownloadableFile{Uri: *uri, DownloadDir: t.TempDir()}
+				options = k6.WithRemoteTestScript(desc)
 			}
 
-			container, err := k6.RunContainer(ctx, k6.WithCache(), k6.WithTestScript(absPath))
+			container, err := k6.RunContainer(ctx, k6.WithCache(), options)
 			if err != nil {
 				t.Fatal(err)
 			}