Add reverse proxy configuration support for remote IP address (#14959)

* Add reverse proxy configuration support for remote IP address validation

* Trust all IP addresses in containerized environments by default

* Use single option to specify networks and proxy IP addresses. By default trust all loopback IPs

Co-authored-by: techknowlogick <techknowlogick@gitea.io>

vendor/github.com/chi-middleware/proxy/README.md

@@ -0,0 +1,46 @@
+# [Chi](https://github.com/go-chi/chi) proxy middleware
+
+Forwarded headers middleware to use if application is run behind reverse proxy.
+
+[![Documentation](https://godoc.org/github.com/chi-middleware/proxy?status.svg)](https://pkg.go.dev/github.com/chi-middleware/proxy)
+[![codecov](https://codecov.io/gh/chi-middleware/proxy/branch/master/graph/badge.svg)](https://codecov.io/gh/chi-middleware/proxy)
+[![Go Report Card](https://goreportcard.com/badge/github.com/chi-middleware/proxy)](https://goreportcard.com/report/github.com/chi-middleware/proxy)
+[![Build Status](https://cloud.drone.io/api/badges/chi-middleware/proxy/status.svg?ref=refs/heads/master)](https://cloud.drone.io/chi-middleware/proxy)
+
+## Usage
+
+Import using:
+
+```go
+import "github.com/chi-middleware/proxy"
+```
+
+Use middleware with default options (trusted from proxy `127.0.0.1` and trusts only last IP address provided in header):
+
+```go
+    r := chi.NewRouter()
+    r.Use(proxy.ForwardedHeaders())
+```
+
+Extend default options:
+
+```go
+    r := chi.NewRouter()
+    r.Use(proxy.ForwardedHeaders(
+        proxy.NewForwardedHeadersOptions().
+            WithForwardLimit(2).
+            ClearTrustedProxies().AddTrustedProxy("10.0.0.1"),
+    ))
+```
+
+Provide custom options:
+
+```go
+    r := chi.NewRouter()
+    r.Use(proxy.ForwardedHeaders(&ForwardedHeadersOptions{
+        ForwardLimit: 1,
+        TrustedProxies: []net.IP{
+            net.IPv4(10, 0, 0, 1),
+        },
+    }))
+```