Initial working version

* supports HTTP
* support TLS interception e.g. for HTTPS
* support CA generation via cli
* first draft of plugin API
* support commands from plugins
* includes Dockerfile
* includes basic configuration

.dockerignore

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+###############
+# Directories #
+###############
+
+.git/
+plugins/
+
+#########
+# Files #
+#########
+
+*.out
+main
+inetmock
+README.md
+.dockerignore
+.gitignore
+Dockerfile

.gitattributes

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+assets/fakeFiles/* filter=lfs diff=lfs merge=lfs -text

.gitignore

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+#########
+# files #
+#########
+
+**/cov.out
+**/cov-raw.out
+**/*.so
+*.key
+*.pem
+inetmock
+main
+
+###############
+# directories #
+###############
+
+.idea/

Dockerfile

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+FROM golang:1.14-buster as build
+
+# Create appuser.
+ARG USER=inetmock
+ARG USER_ID=10001
+
+ENV CGO_ENABLED=0
+
+# Prepare build stage - can be cached
+WORKDIR /work
+RUN apt-get update && \
+    apt-get install -y --no-install-recommends make gcc && \
+    adduser \
+        --disabled-password \
+        --gecos "" \
+        --home "/nonexistent" \
+        --shell "/sbin/nologin" \
+        --no-create-home \
+        --uid "${USER_ID}" \
+        "${USER}"
+
+# Fetch dependencies
+COPY Makefile go.mod go.sum ./
+RUN go mod download
+
+COPY ./ ./
+
+# Build binary and plugins
+RUN make CONTAINER=yes
+
+# Runtime layer
+
+FROM scratch
+
+WORKDIR /app
+
+COPY --from=build /etc/passwd /etc/group /etc/
+COPY --from=build --chown=$USER /work/inetmock ./
+COPY --from=build --chown=$USER /work/plugins/ ./plugins/
+
+USER $USER:$USER
+
+ENTRYPOINT ["/app/inetmock"]

Makefile

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+VERSION = $(shell git describe --dirty --tags --always)
+DIR = $(dir $(realpath $(firstword $(MAKEFILE_LIST))))
+BUILD_PATH = $(DIR)/main.go
+PKGS = $(shell go list ./...)
+TEST_PKGS = $(shell find . -type f -name "*_test.go" -printf '%h\n' | sort -u)
+GOARGS = GOOS=linux GOARCH=amd64
+GO_BUILD_ARGS = -ldflags="-w -s"
+GO_CONTAINER_BUILD_ARGS = -ldflags="-w -s" -a -installsuffix cgo
+GO_DEBUG_BUILD_ARGS = -gcflags "all=-N -l"
+BINARY_NAME = inetmock
+PLUGINS = $(wildcard $(DIR)pkg/plugins/*/.)
+DEBUG_PORT = 2345
+DEBUG_ARGS?= --development-logs=true
+INETMOCK_PLUGINS_DIRECTORY = $(DIR)plugins
+
+.PHONY: clean all format deps compile debug test cli-cover-report html-cover-report plugins $(PLUGINS)
+
+all: clean format compile test plugins
+
+clean:
+	@find $(DIR) -type f \( -name "*.out" -or -name "*.so" \) -exec rm -f {} \;
+	@rm -rf $(DIR)plugins
+	@rm -f $(DIR)$(BINARY_NAME) $(DIR)main
+
+format:
+	@go fmt $(PKGS)
+
+deps:
+	@go mod tidy
+	@go build -v $(BUILD_PATH)
+
+compile: deps
+ifdef DEBUG
+	@echo 'Compiling for debugging...'
+	@$(GOARGS) go build $(GO_DEBUG_BUILD_ARGS) -o $(DIR)$(BINARY_NAME) $(BUILD_PATH)
+else ifdef CONTAINER
+	@echo 'Compiling for container usage...'
+	@$(GOARGS) go build $(GO_CONTAINER_BUILD_ARGS) -o $(DIR)$(BINARY_NAME) $(BUILD_PATH)
+else
+	@echo 'Compiling for normal Linux env...'
+	@$(GOARGS) go build $(GO_BUILD_ARGS) -o $(DIR)$(BINARY_NAME) $(BUILD_PATH)
+endif
+
+debug:
+	@export INETMOCK_PLUGINS_DIRECTORY
+	@dlv exec $(DIR)$(BINARY_NAME) \
+		--headless \
+		--listen=:2345 \
+		--api-version=2 \
+		--accept-multiclient \
+		-- $(DEBUG_ARGS)
+test:
+	@go test -coverprofile=./cov-raw.out -v $(TEST_PKGS)
+	@cat ./cov-raw.out | grep -v "generated" > ./cov.out
+
+cli-cover-report:
+	@go tool cover -func=cov.out
+
+html-cover-report:
+	@go tool cover -html=cov.out -o .coverage.html
+
+plugins: $(PLUGINS)
+$(PLUGINS):
+	$(MAKE) -C $@

config.yaml

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+endpoints:
+  plainHttp:
+    handler: http_mock
+    listenAddress: 0.0.0.0
+    port: 80
+    options:
+      rules:
+        - pattern: ".*\\.(?i)exe"
+          target: ./assets/fakeFiles/sample.exe
+        - pattern: ".*\\.(?i)(jpg|jpeg)"
+          target: ./assets/fakeFiles/default.jpg
+        - pattern: ".*\\.(?i)png"
+          target: ./assets/fakeFiles/default.png
+        - pattern: ".*\\.(?i)gif"
+          target: ./assets/fakeFiles/default.gif
+        - pattern: ".*\\.(?i)ico"
+          target: ./assets/fakeFiles/default.ico
+        - pattern: ".*\\.(?i)txt"
+          target: ./assets/fakeFiles/default.txt
+        - pattern: ".*"
+          target: ./assets/fakeFiles/default.html
+  httpsDowngrade:
+    handler: tls_interceptor
+    listenAddress: 0.0.0.0
+    port: 443
+    options:
+      ecdsaCurve: P256
+      validity:
+        ca:
+          notBeforeRelative: 17520h
+          notAfterRelative: 17520h
+        domain:
+          notBeforeRelative: 168h
+          notAfterRelative: 168h
+      rootCaCert:
+        publicKey: ./ca.pem
+        privateKey: ./ca.key
+      certCachePath: /tmp/inetmock/
+      target:
+        ipAddress: 127.0.0.1
+        port: 80

go.mod

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+module github.com/baez90/inetmock
+
+go 1.13
+
+require (
+	github.com/spf13/cobra v0.0.6
+	github.com/spf13/pflag v1.0.5
+	github.com/spf13/viper v1.4.0
+	go.uber.org/zap v1.14.1
+	golang.org/x/tools v0.0.0-20191127201027-ecd32218bd7f // indirect
+	gopkg.in/yaml.v2 v2.2.8 // indirect
+)