[client,signal,management] Add browser client support (#4415)

client/wasm/internal/http/http.go

@@ -0,0 +1,100 @@
+//go:build js
+
+package http
+
+import (
+	"fmt"
+	"io"
+	log "github.com/sirupsen/logrus"
+	"net/http"
+	"strings"
+	"syscall/js"
+	"time"
+
+	netbird "github.com/netbirdio/netbird/client/embed"
+)
+
+const (
+	httpTimeout     = 30 * time.Second
+	maxResponseSize = 1024 * 1024 // 1MB
+)
+
+// performRequest executes an HTTP request through NetBird and returns the response and body
+func performRequest(nbClient *netbird.Client, method, url string, headers map[string]string, body []byte) (*http.Response, []byte, error) {
+	httpClient := nbClient.NewHTTPClient()
+	httpClient.Timeout = httpTimeout
+
+	req, err := http.NewRequest(method, url, strings.NewReader(string(body)))
+	if err != nil {
+		return nil, nil, fmt.Errorf("create request: %w", err)
+	}
+
+	for key, value := range headers {
+		req.Header.Set(key, value)
+	}
+
+	resp, err := httpClient.Do(req)
+	if err != nil {
+		return nil, nil, fmt.Errorf("request failed: %w", err)
+	}
+	defer func() {
+		if err := resp.Body.Close(); err != nil {
+			log.Errorf("failed to close response body: %v", err)
+		}
+	}()
+
+	respBody, err := io.ReadAll(io.LimitReader(resp.Body, maxResponseSize))
+	if err != nil {
+		return nil, nil, fmt.Errorf("read response: %w", err)
+	}
+
+	return resp, respBody, nil
+}
+
+// ProxyRequest performs a proxied HTTP request through NetBird and returns a JavaScript object
+func ProxyRequest(nbClient *netbird.Client, request js.Value) (js.Value, error) {
+	url := request.Get("url").String()
+	if url == "" {
+		return js.Undefined(), fmt.Errorf("URL is required")
+	}
+
+	method := "GET"
+	if methodVal := request.Get("method"); !methodVal.IsNull() && !methodVal.IsUndefined() {
+		method = strings.ToUpper(methodVal.String())
+	}
+
+	var requestBody []byte
+	if bodyVal := request.Get("body"); !bodyVal.IsNull() && !bodyVal.IsUndefined() {
+		requestBody = []byte(bodyVal.String())
+	}
+
+	requestHeaders := make(map[string]string)
+	if headersVal := request.Get("headers"); !headersVal.IsNull() && !headersVal.IsUndefined() && headersVal.Type() == js.TypeObject {
+		headerKeys := js.Global().Get("Object").Call("keys", headersVal)
+		for i := 0; i < headerKeys.Length(); i++ {
+			key := headerKeys.Index(i).String()
+			value := headersVal.Get(key).String()
+			requestHeaders[key] = value
+		}
+	}
+
+	resp, body, err := performRequest(nbClient, method, url, requestHeaders, requestBody)
+	if err != nil {
+		return js.Undefined(), err
+	}
+
+	result := js.Global().Get("Object").New()
+	result.Set("status", resp.StatusCode)
+	result.Set("statusText", resp.Status)
+	result.Set("body", string(body))
+
+	headers := js.Global().Get("Object").New()
+	for key, values := range resp.Header {
+		if len(values) > 0 {
+			headers.Set(strings.ToLower(key), values[0])
+		}
+	}
+	result.Set("headers", headers)
+
+	return result, nil
+}