Add expr source

internal/expr/README.md

@@ -0,0 +1,12 @@
+## Comparsion
+
+| expr                     | python                   | js                             |
+|--------------------------|--------------------------|--------------------------------|
+| let x = 1;               | x = 1                    | let x = 1                      |
+| {a: 1, b: 2}             | {"a": 1, "b": 2}         | {a: 1, b: 2}                   |
+| r = fetch(url, {method}) | r = request(method, url) | r = await fetch(url, {method}) |
+| r.ok                     | r.ok                     | r.ok                           |
+| r.status                 | r.status_code            | r.status                       |
+| r.text                   | r.text                   | await r.text()                 |
+| r.json()                 | r.json()                 | await r.json()                 |
+| r.headers                | r.headers                | r.headers                      |

internal/expr/expr.go

@@ -0,0 +1,28 @@
+package expr
+
+import (
+	"errors"
+
+	"github.com/AlexxIT/go2rtc/internal/app"
+	"github.com/AlexxIT/go2rtc/internal/streams"
+	"github.com/AlexxIT/go2rtc/pkg/expr"
+)
+
+func Init() {
+	log := app.GetLogger("expr")
+
+	streams.RedirectFunc("expr", func(url string) (string, error) {
+		v, err := expr.Run(url[5:])
+		if err != nil {
+			return "", err
+		}
+
+		log.Debug().Msgf("[expr] url=%s", url)
+
+		if url = v.(string); url == "" {
+			return "", errors.New("expr: result is empty")
+		}
+
+		return url, nil
+	})
+}