4 files changed, 94 insertions, 0 deletions
diff --git a/Dockerfile b/Dockerfile
new file mode 100644
index 0000000..fdd725a
--- /dev/null
+++ b/Dockerfile
@@ -0,0 +1,20 @@
+FROM alpine:3.17 as builder
+ENV GOPROXY=https://goproxy.io
+RUN apk update && apk upgrade
+RUN apk add go git
+ENV GOPROXY=https://goproxy.io
+COPY go.* /icanhazallips/
+RUN cd /icanhazallips && go mod download
+COPY *.go /icanhazallips/
+RUN cd /icanhazallips && go build
+
+FROM alpine:3.17 as certbuilder
+RUN apk add openssl
+WORKDIR /certs
+RUN openssl req -nodes -new -x509 -subj="/C=US/ST=Denial/L=springfield/O=Dis/CN=localhost" -keyout server.key -out server.cert
+
+FROM gcr.io/distroless/static-debian11
+# FROM alpine:3.17
+COPY --from=certbuilder /certs /certs
+COPY --from=builder /icanhazallips/icanhazallips /icanhazallips/icanhazallips
+ENTRYPOINT ["/icanhazallips/icanhazallips"]
diff --git a/docker-compose.yaml b/docker-compose.yaml
new file mode 100644
index 0000000..769885b
--- /dev/null
+++ b/docker-compose.yaml
@@ -0,0 +1,17 @@
+version: "3"
+services:
+  icanhazallips:
+    image: icanhazallips
+    build:
+      context: .
+    networks:
+      - mainnet
+    restart: unless-stopped
+    ports:
+      - "9380:8080"
+    entrypoint: ["/icanhazallips/icanhazallips"]
+    cap_drop:
+      - ALL
+networks:
+  mainnet:
+    driver: bridge
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..6f0768c
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,3 @@
+module icanhazallips
+
+go 1.19
diff --git a/icanhazallips.go b/icanhazallips.go
new file mode 100644
index 0000000..bcca91e
--- /dev/null
+++ b/icanhazallips.go
@@ -0,0 +1,54 @@
+// https://gist.github.com/miguelmota/7b765edff00dc676215d6174f3f30216
+package main
+
+import (
+	"errors"
+	"log"
+	"net"
+	"net/http"
+	"strings"
+)
+
+func getIP(r *http.Request) (string, error) {
+	ips := r.Header.Get("X-Forwarded-For")
+	splitIps := strings.Split(ips, ",")
+
+	if len(splitIps) > 0 {
+		netIP := net.ParseIP(splitIps[len(splitIps)-1])
+		if netIP != nil {
+			return netIP.String(), nil
+		}
+	}
+
+	ip, _, err := net.SplitHostPort(r.RemoteAddr)
+	if err != nil {
+		return "", err
+	}
+
+	netIP := net.ParseIP(ip)
+	if netIP != nil {
+		ip := netIP.String()
+		if ip == "::1" {
+			return "127.0.0.1", nil
+		}
+		return ip, nil
+	}
+
+	return "", errors.New("IP not found")
+}
+
+func handler(w http.ResponseWriter, r *http.Request) {
+	ip, err := getIP(r)
+	if err != nil {
+		w.WriteHeader(http.StatusInternalServerError)
+		return
+	}
+
+	w.WriteHeader(http.StatusOK)
+	w.Write([]byte(ip))
+}
+
+func main() {
+	http.HandleFunc("/", handler)
+	log.Fatal(http.ListenAndServe(":8080", nil))
+}