Plugins: Handle app plugin proxy routes per request (#51835)

Fixes #47530

pkg/api/plugin_proxy.go

@@ -0,0 +1,68 @@
+package api
+
+import (
+	"crypto/tls"
+	"net"
+	"net/http"
+	"regexp"
+	"sync"
+	"time"
+
+	"github.com/grafana/grafana/pkg/api/pluginproxy"
+	"github.com/grafana/grafana/pkg/models"
+	"github.com/grafana/grafana/pkg/services/pluginsettings"
+	"github.com/grafana/grafana/pkg/web"
+)
+
+func (hs *HTTPServer) ProxyPluginRequest(c *models.ReqContext) {
+	var once sync.Once
+	var pluginProxyTransport *http.Transport
+	once.Do(func() {
+		pluginProxyTransport = &http.Transport{
+			TLSClientConfig: &tls.Config{
+				InsecureSkipVerify: hs.Cfg.PluginsAppsSkipVerifyTLS,
+				Renegotiation:      tls.RenegotiateFreelyAsClient,
+			},
+			Proxy: http.ProxyFromEnvironment,
+			DialContext: (&net.Dialer{
+				Timeout:   30 * time.Second,
+				KeepAlive: 30 * time.Second,
+			}).DialContext,
+			TLSHandshakeTimeout: 10 * time.Second,
+		}
+	})
+
+	pluginID := web.Params(c.Req)[":pluginId"]
+
+	plugin, exists := hs.pluginStore.Plugin(c.Req.Context(), pluginID)
+	if !exists {
+		c.JsonApiErr(http.StatusNotFound, "Plugin not found, no installed plugin with that id", nil)
+		return
+	}
+
+	query := pluginsettings.GetByPluginIDArgs{OrgID: c.OrgID, PluginID: plugin.ID}
+	ps, err := hs.PluginSettings.GetPluginSettingByPluginID(c.Req.Context(), &query)
+	if err != nil {
+		c.JsonApiErr(http.StatusInternalServerError, "Failed to fetch plugin settings", err)
+		return
+	}
+
+	proxyPath := getProxyPath(c)
+	p, err := pluginproxy.NewPluginProxy(ps, plugin.Routes, c, proxyPath, hs.Cfg, hs.SecretsService, hs.tracer, pluginProxyTransport)
+	if err != nil {
+		c.JsonApiErr(http.StatusInternalServerError, "Failed to create plugin proxy", err)
+		return
+	}
+
+	p.HandleRequest()
+}
+
+var pluginProxyPathRegexp = regexp.MustCompile(`^\/api\/plugin-proxy\/([\w\-]+)\/?`)
+
+func extractProxyPath(originalRawPath string) string {
+	return pluginProxyPathRegexp.ReplaceAllString(originalRawPath, "")
+}
+
+func getProxyPath(c *models.ReqContext) string {
+	return extractProxyPath(c.Req.URL.EscapedPath())
+}