install go2rtc on bob

2026-04-04 19:36:14 +02:00
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+# Expr
+
+[`new in v1.8.2`](https://github.com/AlexxIT/go2rtc/releases/tag/v1.8.2)
+
+[Expr](https://github.com/antonmedv/expr) - expression language and expression evaluation for Go.
+
+- [language definition](https://expr.medv.io/docs/Language-Definition) - takes best from JS, Python, Jinja2 syntax
+- your expression should return a link of any supported source
+- expression supports multiple operation, but:
+  - all operations must be separated by a semicolon
+  - all operations, except the last one, must declare a new variable (`let s = "abc";`)
+  - the last operation should return a string
+- go2rtc supports additional functions:
+  - `fetch` - JS-like HTTP requests
+  - `match` - JS-like RegExp queries
+
+## Fetch examples
+
+Multiple fetch requests are executed within a single session. They share the same cookie.
+
+**HTTP GET**
+
+```js
+var r = fetch('https://example.org/products.json');
+```
+
+**HTTP POST JSON**
+
+```js
+var r = fetch('https://example.org/post', {
+    method: 'POST',
+    // Content-Type: application/json will be set automatically
+    json: {username: 'example'}
+});
+```
+
+**HTTP POST Form**
+
+```js
+var r = fetch('https://example.org/post', {
+    method: 'POST',
+    // Content-Type: application/x-www-form-urlencoded will be set automatically
+    data: {username: 'example', password: 'password'}
+});
+```
+
+## Script examples
+
+**Two way audio for Dahua VTO**
+
+```yaml
+streams:
+  dahua_vto: |
+    expr:
+    let host = 'admin:password@192.168.1.123';
+
+    var r = fetch('http://' + host + '/cgi-bin/configManager.cgi?action=setConfig&Encode[0].MainFormat[0].Audio.Compression=G.711A&Encode[0].MainFormat[0].Audio.Frequency=8000');
+
+    'rtsp://' + host + '/cam/realmonitor?channel=1&subtype=0&unicast=true&proto=Onvif'
+```
+
+**dom.ru**
+
+You can get credentials from https://github.com/ad/domru
+
+```yaml
+streams:
+  dom_ru: |
+    expr:
+    let camera   = '***';
+    let token    = '***';
+    let operator = '***';
+
+    fetch('https://myhome.proptech.ru/rest/v1/forpost/cameras/' + camera + '/video', {
+      headers: {
+        'Authorization': 'Bearer ' + token,
+        'User-Agent': 'Google sdkgphone64x8664 | Android 14 | erth | 8.26.0 (82600010) | 0 | 0 | 0',
+        'Operator': operator
+      }
+    }).json().data.URL
+```
+
+**dom.ufanet.ru**
+
+```yaml
+streams:
+  ufanet_ru: |
+    expr:
+    let username = '***';
+    let password = '***';
+    let cameraid = '***';
+
+    let r1 = fetch('https://ucams.ufanet.ru/api/internal/login/', {
+      method: 'POST',
+      data: {username: username, password: password}
+    });
+    let r2 = fetch('https://ucams.ufanet.ru/api/v0/cameras/this/?lang=ru', {
+      method: 'POST',
+      json: {'fields': ['token_l', 'server'], 'token_l_ttl': 3600, 'numbers': [cameraid]},
+    }).json().results[0];
+
+    'rtsp://' + r2.server.domain + '/' + r2.number + '?token=' + r2.token_l
+```
+
+**Parse HLS files from Apple**
+
+Same example in two languages - python and expr.
+
+```yaml
+streams:
+  example_python: |
+    echo:python -c 'from urllib.request import urlopen; import re
+
+    # url1 = "https://devstreaming-cdn.apple.com/videos/streaming/examples/bipbop_16x9/bipbop_16x9_variant.m3u8"
+    html1 = urlopen("https://developer.apple.com/streaming/examples/basic-stream-osx-ios5.html").read().decode("utf-8")
+    url1 = re.search(r"https.+?m3u8", html1)[0]
+
+    # url2 = "gear1/prog_index.m3u8"
+    html2 = urlopen(url1).read().decode("utf-8")
+    url2 = re.search(r"^[a-z0-1/_]+\.m3u8$", html2, flags=re.MULTILINE)[0]
+
+    # url3 = "https://devstreaming-cdn.apple.com/videos/streaming/examples/bipbop_16x9/gear1/prog_index.m3u8"
+    url3 = url1[:url1.rindex("/")+1] + url2
+
+    print("ffmpeg:" + url3 + "#video=copy")'
+
+  example_expr: |
+    expr:
+
+    let html1 = fetch("https://developer.apple.com/streaming/examples/basic-stream-osx-ios5.html").text;
+    let url1 = match(html1, "https.+?m3u8")[0];
+
+    let html2 = fetch(url1).text;
+    let url2 = match(html2, "^[a-z0-1/_]+\\.m3u8$", "m")[0];
+
+    let url3 = url1[:lastIndexOf(url1, "/")+1] + url2;
+
+    "ffmpeg:" + url3 + "#video=copy"
+```
+
+## Comparison
+
+| expr                         | python                     | js                             |
+|------------------------------|----------------------------|--------------------------------|
+| let x = 1;                   | x = 1                      | let x = 1                      |
+| {a: 1, b: 2}                 | {"a": 1, "b": 2}           | {a: 1, b: 2}                   |
+| let 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                      |
+| let m = match(text, "abc")   | m = re.search("abc", text) | let m = text.match(/abc/)      |
@@ -0,0 +1,29 @@
+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.Eval(url[5:], nil)
+		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
+	})
+	streams.MarkInsecure("expr")
+}