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/Makefile

@@ -0,0 +1,59 @@
+GO ?= go
+HAS_GO = $(shell hash $(GO) > /dev/null 2>&1 && echo "GO" || echo "NOGO" )
+ifeq ($(HAS_GO), GO)
+	GOPATH ?= $(shell $(GO) env GOPATH)
+	export PATH := $(GOPATH)/bin:$(PATH)
+endif
+
+GOFMT ?= gofmt -s
+
+ifneq ($(RACE_ENABLED),)
+	GOTESTFLAGS ?= -race
+endif
+
+GO_SOURCES := $(wildcard *.go)
+GO_SOURCES_OWN := $(filter-out vendor/%, $(GO_SOURCES))
+GO_PACKAGES ?= $(shell $(GO) list ./... | grep -v /vendor/)
+
+.PHONY: revive
+revive:
+	@hash revive > /dev/null 2>&1; if [ $$? -ne 0 ]; then \
+		$(GO) get -u github.com/mgechev/revive; \
+	fi
+	revive -config .revive.toml -exclude=./vendor/... ./... || exit 1
+
+.PHONY: golangci-lint
+golangci-lint:
+	@hash golangci-lint > /dev/null 2>&1; if [ $$? -ne 0 ]; then \
+		export BINARY="golangci-lint"; \
+		curl -sfL https://install.goreleaser.com/github.com/golangci/golangci-lint.sh | sh -s -- -b $(GOPATH)/bin v1.26.0; \
+	fi
+	golangci-lint run --timeout 5m
+
+.PHONY: lint
+lint: golangci-lint revive
+
+.PHONY: fmt
+fmt:
+	$(GOFMT) -w $(GO_SOURCES_OWN)
+
+.PHONY: fmt-check
+fmt-check:
+	# get all go files and run go fmt on them
+	@diff=$$($(GOFMT) -d $(GO_SOURCES_OWN)); \
+	if [ -n "$$diff" ]; then \
+		echo "Please run 'make fmt' and commit the result:"; \
+		echo "$${diff}"; \
+		exit 1; \
+	fi;
+
+.PHONY: misspell-check
+misspell-check:
+	@hash misspell > /dev/null 2>&1; if [ $$? -ne 0 ]; then \
+		$(GO) get -u github.com/client9/misspell/cmd/misspell; \
+	fi
+	misspell -error $(GO_SOURCES_OWN)
+
+.PHONY: test
+test:
+	$(GO) test -cover -coverprofile coverage.out $(GOTESTFLAGS) $(GO_PACKAGES)