feat(template): enable remote file templating (#680)

* feat(template): sample sensitive config

* feat(template): updated funcs, tests

* fix: go mod tidy

* fix: small refactor on template render

* docs: updated config/template docs

* fix: bump timeout in tui tests

* fix: small refactor for extending tmpl

* fix: bumped timeout

* feat(template): add remote fetch with helper commands

* fix(merge): issue with conflicts

* fix(title): pr title fix

---------

Co-authored-by: Megan Wolf <megan@defenseunicorns.com>

src/cmd/tools/template.go

@@ -8,7 +8,7 @@ import (
 	"github.com/defenseunicorns/go-oscal/src/pkg/files"
 	"github.com/defenseunicorns/lula/src/cmd/common"
 	"github.com/defenseunicorns/lula/src/internal/template"
-	pkgCommon "github.com/defenseunicorns/lula/src/pkg/common"
+	"github.com/defenseunicorns/lula/src/pkg/common/network"
 	"github.com/defenseunicorns/lula/src/pkg/message"
 	"github.com/spf13/cobra"
 )
@@ -46,7 +46,7 @@ func TemplateCommand() *cobra.Command {
 		Example: templateHelp,
 		RunE: func(cmd *cobra.Command, args []string) error {
 			// Read file
-			data, err := pkgCommon.ReadFileToBytes(inputFile)
+			data, err := network.Fetch(inputFile)
 			if err != nil {
 				return fmt.Errorf("error reading file: %v", err)
 			}

src/internal/template/helpers.go

@@ -1,6 +1,11 @@
 package template
 
-import "fmt"
+import (
+	"fmt"
+	"time"
+
+	"github.com/defenseunicorns/go-oscal/src/pkg/uuid"
+)
 
 func concatToRegoList(list []any) string {
 	regoList := ""
@@ -12,3 +17,16 @@ func concatToRegoList(list []any) string {
 	}
 	return regoList
 }
+
+func newUUID(source ...string) string {
+	if len(source) == 0 {
+		return uuid.NewUUID()
+	} else {
+		return uuid.NewUUIDWithSource(source[0])
+	}
+}
+
+func timestamp() string {
+	t := time.Now()
+	return t.Format("2006-01-02T15:04:05.999999999Z")
+}

src/internal/template/template.go

@@ -254,6 +254,8 @@ func createTemplate() *template.Template {
 		"concatToRegoList": func(a []any) string {
 			return concatToRegoList(a)
 		},
+		"uuid":      newUUID,
+		"timestamp": timestamp,
 		// Add more custom functions as needed
 	}