Make the framework available for public

.github/workflows/build-image.yaml

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+name: Build and publish a docker image
+on: [ workflow_dispatch ]
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: ${{ github.repository }}
+jobs:
+  build-image:
+    timeout-minutes: 5
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+      - name: Export environment variables
+        run: |
+          echo BUILD_TIME=$(date --utc --iso-8601=seconds) >> $GITHUB_ENV
+          echo VCS_TAG=$(git describe --tags --abbrev 2>/dev/null || echo -n v0.0.0) >> $GITHUB_ENV
+      - name: Log in to the Container registry
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - name: Extract metadata (tags, labels) for Docker
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+      - name: Setup QEMU
+        uses: docker/setup-qemu-action@v3
+      - name: Setup Docker Buildx
+        uses: docker/setup-buildx-action@v3
+      - name: Build and push image
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          platforms: linux/amd64,linux/arm64
+          file: ./build/Dockerfile
+          push: true
+          provenance: mode=max
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
+          build-args: |
+            VCS_COMMIT=${{ github.sha }}
+            VCS_BRANCH=${{ github.ref_name }}
+            VCS_TAG=${{ env.VCS_TAG }}
+            BUILD_TIME=${{ env.BUILD_TIME }}
+            BUILD_ENVIRONMENT=ci
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}

.github/workflows/build-master-branch.yaml

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+name: Build the master branch
+on:
+  push:
+    branches:
+      - master
+concurrency:
+  group: build-master-branch
+jobs:
+  check-branch:
+    uses: ./.github/workflows/check-branch.yaml
+    secrets: inherit

.github/workflows/check-branch.yaml

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+name: Run linter, shellcheck, and unit tests on a branch
+on: [ workflow_call, workflow_dispatch, pull_request ]
+jobs:
+  lint-and-test:
+    timeout-minutes: 5
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        go-version: [ "1.21" ]
+    steps:
+      - name: Checkout branch
+        uses: actions/checkout@v4
+      - name: Setup Go
+        uses: actions/setup-go@v4
+        with:
+          go-version: ${{ matrix.go-version }}
+      - name: Run linter
+        run: "go vet ./..."
+      - name: Run tests
+        run: "go test ./..."
+      - name: Run shellcheck
+        uses: dominikh/staticcheck-action@v1.3.0
+        with:
+          version: "2023.1.6"
+          install-go: false
+          cache-key: ${{ matrix.go-version }}

.github/workflows/release-git-tag.yaml

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+name: Release a git tag
+on:
+  workflow_dispatch:
+    inputs:
+      git_tag:
+        description: 'the git tag to publish'
+        type: string
+        required: true
+jobs:
+  check-branch:
+    uses: ./.github/workflows/check-branch.yaml
+    secrets: inherit
+  publish-tag:
+    needs: [ check-branch ]
+    timeout-minutes: 5
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+    steps:
+      - name: Checkout branch
+        uses: actions/checkout@v4
+      - name: Create the git tag
+        run: |
+          git config --global user.name "Glove CI"
+          git config --global user.email "glove-ci@users.noreply.github.com"
+          git tag --annotate "${{ github.event.inputs.git_tag }}" --message "Version ${{ github.event.inputs.git_tag }}"
+          git push origin "${{ github.event.inputs.git_tag }}"

.github/workflows/upload-code-cover-task.yaml

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+name: Generate and upload a code coverage report
+on: [workflow_dispatch]
+jobs:
+  lint-and-test:
+    timeout-minutes: 5
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Setup Go
+        uses: actions/setup-go@v4
+        with:
+          go-version: "1.21"
+      - run: "go test ./... -coverpkg=glove/internal/...,glove/pkg/... -coverprofile=coverage.out"
+      - name: Upload coverage reports to Codecov
+        uses: codecov/codecov-action@v3
+        with:
+          fail_ci_if_error: true
+          files: ./coverage.out
+        env:
+          CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}

.gitignore

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+bin
+.idea
+glove.iml
+coverage.out

License.md

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+Copyright (c) 2023 The Glove Authors. All rights reserved.
+
+Redistribution and use in source and binary forms, with or without modification,
+are permitted provided that the following conditions are met:
+
+1. Redistributions of source code must retain the above copyright notice, this
+   list of conditions and the following disclaimer.
+
+2. Redistributions in binary form must reproduce the above copyright notice,
+   this list of conditions and the following disclaimer in the documentation
+   and/or other materials provided with the distribution.
+
+3. Neither the name of the copyright holder nor the names of its contributors
+   may be used to endorse or promote products derived from this software without
+   specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS “AS IS” AND
+ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
+ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (
+INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
+EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

Makefile

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+# Copyright 2023 The Glove Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be found in the LICENSE file.
+
+ifndef VCS_COMMIT
+	VCS_COMMIT := $(shell git rev-parse HEAD)
+endif
+
+ifndef VCS_BRANCH
+	VCS_BRANCH := $(shell git rev-parse --abbrev-ref HEAD)
+endif
+
+ifndef VCS_TAG
+	VCS_TAG := $(shell git describe --tags --abbrev 2>/dev/null || echo -n "v0.0.0")
+endif
+
+ifndef BUILD_TIME
+	BUILD_TIME := $(shell date --utc --iso-8601=seconds)
+endif
+
+ifndef BUILD_ENVIRONMENT
+	BUILD_ENVIRONMENT := local
+endif
+
+LDFLAGS = "-X glove/internal/version.commitHash=${VCS_COMMIT} \
+-X glove/internal/version.branch=${VCS_BRANCH} \
+-X glove/internal/version.version=${VCS_TAG} \
+-X glove/internal/version.buildTime=${BUILD_TIME} \
+-X glove/internal/version.environment=${BUILD_ENVIRONMENT}"
+
+.PHONY: build clean cli deps-install deps-update format image lint test test-cover update
+
+cli: deps-install build
+
+format:
+	gofmt -l -s -w .
+
+lint:
+	go vet ./...
+	staticcheck ./...
+
+test:
+	go test ./...
+
+test-cover:
+	go test ./... -coverpkg=glove/internal/...,glove/pkg/... -coverprofile=coverage.out
+
+deps-install:
+	go get ./...
+
+deps-update:
+	go get -u ./...
+
+build:
+	echo $(LDFLAGS)
+	go generate && go build -ldflags=$(LDFLAGS) -o ./bin/glove ./cmd/glove/main.go
+
+clean:
+	rm ./bin/glove
+
+image:
+	docker build \
+	--build-arg="VCS_COMMIT=${VCS_COMMIT}" \
+	--build-arg="VCS_BRANCH=${VCS_BRANCH}" \
+	--build-arg="VCS_TAG=${VCS_TAG}" \
+	--build-arg="BUILD_TIME=${BUILD_TIME}" \
+	--build-arg="BUILD_ENVIRONMENT=${BUILD_ENVIRONMENT}" \
+	-t glove -f ./build/Dockerfile .

README.md

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+# Glove: Build forward proxies in Golang
+
+<p align="center">
+  <img src="./assets/gopher.png" width="128" height="128" align="center">
+</p>
+
+<p align="center">
+  <img src="https://codecov.io/gh/pmateusz/glove/graph/badge.svg?token=VKTGCERVTC" alt="Codecov" /> 
+  <img src="https://img.shields.io/github/license/pmateusz/glove" alt="License: BSD-3-Clause" />
+</p>
+
+Glove is a framework for developing HTTP/HTTPS forward proxies in Golang that makes it easy to implement a custom logic
+for processing HTTP/HTTPS traffic that is passing through the proxy.
+
+## Why you may actually want to build a forward proxy?
+
+The ability to introspect and alter HTTP/HTTPS traffic passing by a forward proxy could be used to address many
+technical problems that arise during integration with external APIs:
+
+- Logging and auditing of requests and responses,
+- Enforcing access control measures to restrict communication with the origin server, i.e., blocking access to certain
+  hosts or a subset of endpoints,
+- Signing requests on behalf of the client, secret rotation, and secret access policy management are simplified because
+  API keys don't need to be disclosed to the client,
+- Queuing requests from multiple clients to mitigate the risk of throttling, and to prevent escalation of throttling
+  events,
+- Providing consistent retry policy in response to timeouts and throttling events.
+
+There are no universal solutions for the scenarios mentioned above. For that reason, instead of attempting to provide
+opinionated solutions, Glove focuses on helping to plug in arbitrary code for processing HTTP/HTTPS requests and
+responses implemented in Golang.
+
+## Features
+
+Glove supports processing HTTP and HTTPS traffic. The introspection of HTTPS traffic is conditional on the successful
+TLS handshake between the clients and the proxy. Subsequently, the proxy acts as the man-in-the-middle (**MITM**)
+passing a request received from the client to the origin server. The server might not be aware the request received from
+the proxy was sent on behalf of some other client. Once the origin server replies, the proxy is responsible for passing
+the response back to the client.
+
+Besides MITM, Glove supports **TCP tunneling** (a.k.a. transparent proxy). In contrast to MITM, which requires the
+client to accept a TLS handshake with the proxy, in TCP tunneling the handshake is established between the client and
+the origin server. The proxy responsibility is restricted to accepting the TCP connection requested by the client,
+establishing a TCP
+connection with the origin server, and copying a stream of bytes between both connections. Traffic passing through the
+proxy is encrypted. Consequently, introspection of HTTPS communication is not available, and custom handlers are not
+executed. TCP tunneling doesn't require any additional configuration of the client and the proxy. The primary motivation
+for setting up a proxy for TCP tunneling is to prevent the client's IP address/location from being discovered. As the
+origin server
+receives traffic for the IP address of the proxy, it is not aware of the client's whereabouts.
+
+Glove supports **websockets** in the MITM mode. Specifically, Glove responds to an HTTP/HTTPS request to upgrade the
+protocol to a websocket by switching the mode of handling the connection from MITM to TCP tunneling.
+
+Finally, besides core forward proxy abilities, Glove provides some auxiliary features:
+
+- Ability to **customize TLS configuration** used by the proxy based on the client host or the origin server,
+- **IP and CIDR whitelisting** of hosts allowed to connect to the proxy.
+
+## Mission Statement
+
+As authors, our mission was to develop a useful framework that will help build high-quality solutions for technical
+problems arising in a broad range of applications in a time-efficient manner. The project is open source and licensed
+using a permissive BSD-type license, which makes it effectively free for commercial applications.
+
+## Sponsorship
+
+Future project maintenance relies on financial support. Please consider sponsorship or a donation if the framework
+benefits your project or the company. We thank private and corporate sponsors for their generous financial support.
+
+## License
+
+This project is licensed under the terms of the [3-Clause BSD](./License.md) License.
+
+## References
+
+- [**Developer Guide**](./docs/developer-guide.md)

build/Dockerfile

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+# Copyright 2023 The Glove Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be found in the LICENSE file.
+
+# syntax=docker/dockerfile:1
+ARG GO_VERSION=1.21
+
+FROM golang:${GO_VERSION} as build-stage
+ARG VCS_COMMIT
+ARG VCS_BRANCH
+ARG VCS_TAG
+ARG BUILD_TIME
+ARG BUILD_ENVIRONMENT
+WORKDIR /build
+COPY cmd /build/cmd
+COPY internal /build/internal
+COPY pkg /build/pkg
+COPY go.mod /build
+RUN go mod tidy
+RUN go generate && CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build \
+ -ldflags="-X glove/internal/version.commitHash=${VCS_COMMIT} \
+ -X glove/internal/version.branch=${VCS_BRANCH} \
+ -X glove/internal/version.version=${VCS_TAG} \
+ -X glove/internal/version.buildTime=${BUILD_TIME} \
+ -X glove/internal/version.environment=${BUILD_ENVIRONMENT}" \
+ -o glove ./cmd/glove/main.go
+
+FROM gcr.io/distroless/base-debian11 AS release-stage
+WORKDIR /
+COPY --from=build-stage /build/glove /glove
+EXPOSE 8080
+USER nonroot:nonroot
+ENTRYPOINT ["/glove"]

cmd/glove/main.go

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+/*
+ * Copyright 2023 The Glove Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be found in the LICENSE file.
+ */
+
+package main
+
+import (
+	"glove/pkg/cmd"
+)
+
+func main() {
+	cmd.Execute()
+}