install go2rtc on bob

installs_on_host/go2rtc/internal/echo/README.md

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+# Echo
+
+Some sources may have a dynamic link. And you will need to get it using a Bash or Python script. Your script should echo a link to the source. RTSP, FFmpeg or any of the supported sources.
+
+**Docker** and **Home Assistant add-on** users have preinstalled `python3`, `curl`, `jq`.
+
+## Configuration
+
+```yaml
+streams:
+  apple_hls: echo:python3 hls.py https://developer.apple.com/streaming/examples/basic-stream-osx-ios5.html
+```
+
+## Install python libraries
+
+**Docker** and **Hass Add-on** users have preinstalled `python3` without any additional libraries, like [requests](https://requests.readthedocs.io/) or others. If you need some additional libraries - you need to install them to folder with your script:
+
+1. Install [SSH & Web Terminal](https://github.com/hassio-addons/addon-ssh)
+2. Goto Add-on Web UI
+3. Install library: `pip install requests -t /config/echo`
+4. Add your script to `/config/echo/myscript.py`
+5. Use your script as source `echo:python3 /config/echo/myscript.py`
+
+## Example: Apple HLS
+
+```yaml
+streams:
+  apple_hls: echo:python3 hls.py https://developer.apple.com/streaming/examples/basic-stream-osx-ios5.html
+```
+
+**hls.py**
+
+```python
+import re
+import sys
+from urllib.parse import urljoin
+from urllib.request import urlopen
+
+html = urlopen(sys.argv[1]).read().decode("utf-8")
+url = re.search(r"https.+?m3u8", html)[0]
+
+html = urlopen(url).read().decode("utf-8")
+m = re.search(r"^[a-z0-1/_]+\.m3u8$", html, flags=re.MULTILINE)
+url = urljoin(url, m[0])
+
+# ffmpeg:https://devstreaming-cdn.apple.com/videos/streaming/examples/bipbop_16x9/gear1/prog_index.m3u8#video=copy
+print("ffmpeg:" + url + "#video=copy")
+```

installs_on_host/go2rtc/internal/echo/echo.go

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+package echo
+
+import (
+	"bytes"
+	"errors"
+	"os/exec"
+	"slices"
+
+	"github.com/AlexxIT/go2rtc/internal/app"
+	"github.com/AlexxIT/go2rtc/internal/streams"
+	"github.com/AlexxIT/go2rtc/pkg/shell"
+)
+
+func Init() {
+	var cfg struct {
+		Mod struct {
+			AllowPaths []string `yaml:"allow_paths"`
+		} `yaml:"echo"`
+	}
+
+	app.LoadConfig(&cfg)
+
+	allowPaths := cfg.Mod.AllowPaths
+
+	log := app.GetLogger("echo")
+
+	streams.RedirectFunc("echo", func(url string) (string, error) {
+		args := shell.QuoteSplit(url[5:])
+
+		if allowPaths != nil && !slices.Contains(allowPaths, args[0]) {
+			return "", errors.New("echo: bin not in allow_paths: " + args[0])
+		}
+
+		b, err := exec.Command(args[0], args[1:]...).Output()
+		if err != nil {
+			return "", err
+		}
+
+		b = bytes.TrimSpace(b)
+
+		log.Debug().Str("url", url).Msgf("[echo] %s", b)
+
+		return string(b), nil
+	})
+	streams.MarkInsecure("echo")
+}