[#3273] added readerToString() JSVM helper

plugins/jsvm/binds.go

@@ -33,6 +33,7 @@ import (
 	"github.com/pocketbase/pocketbase/tools/inflector"
 	"github.com/pocketbase/pocketbase/tools/list"
 	"github.com/pocketbase/pocketbase/tools/mailer"
+	"github.com/pocketbase/pocketbase/tools/rest"
 	"github.com/pocketbase/pocketbase/tools/security"
 	"github.com/pocketbase/pocketbase/tools/types"
 	"github.com/spf13/cobra"
@@ -278,6 +279,21 @@ func wrapMiddlewares(executors *vmsPool, rawMiddlewares ...goja.Value) ([]echo.M
 func baseBinds(vm *goja.Runtime) {
 	vm.SetFieldNameMapper(FieldMapper{})
 
+	vm.Set("readerToString", func(r io.Reader, maxBytes int) (string, error) {
+		if maxBytes == 0 {
+			maxBytes = rest.DefaultMaxMemory
+		}
+
+		limitReader := io.LimitReader(r, int64(maxBytes))
+
+		bodyBytes, readErr := io.ReadAll(limitReader)
+		if readErr != nil {
+			return "", readErr
+		}
+
+		return string(bodyBytes), nil
+	})
+
 	vm.Set("arrayOf", func(model any) any {
 		mt := reflect.TypeOf(model)
 		st := reflect.SliceOf(mt)

plugins/jsvm/binds_test.go

@@ -46,7 +46,27 @@ func TestBaseBindsCount(t *testing.T) {
 	vm := goja.New()
 	baseBinds(vm)
 
-	testBindsCount(vm, "this", 13, t)
+	testBindsCount(vm, "this", 14, t)
+}
+
+func TestBaseBindsReaderToString(t *testing.T) {
+	app, _ := tests.NewTestApp()
+	defer app.Cleanup()
+
+	vm := goja.New()
+	baseBinds(vm)
+	vm.Set("reader", strings.NewReader("test"))
+
+	_, err := vm.RunString(`
+		let result = readerToString(reader)
+
+		if (result != "test") {
+			throw new Error('Expected "test", got ' + result);
+		}
+	`)
+	if err != nil {
+		t.Fatal(err)
+	}
 }
 
 func TestBaseBindsRecord(t *testing.T) {

plugins/jsvm/internal/types/types.go

@@ -180,6 +180,24 @@ declare var $app: appWithoutHooks
  */
 declare var $template: template.Registry
 
+/**
+ * readerToString reads the content of the specified io.Reader until
+ * EOF or maxBytes are reached.
+ *
+ * If maxBytes is not specified it will read up to 32MB.
+ *
+ * Note that after this call the reader can't be used anymore.
+ *
+ * Example:
+ *
+ * ` + "```" + `js
+ * const rawBody = readerToString(c.request().body)
+ * ` + "```" + `
+ *
+ * @group PocketBase
+ */
+declare function readerToString(reader: any, maxBytes?: number): string;
+
 /**
  * arrayOf creates a placeholder array of the specified models.
  * Usually used to populate DB result into an array of models.