From 685455783185247ed52bf9cdecf5c18eff146fe7 Mon Sep 17 00:00:00 2001 From: William Petit Date: Mon, 24 Apr 2023 19:53:37 +0200 Subject: [PATCH] feat: initial commit --- README.md | 7 + examples/README.md | 3 + examples/basic_rewrite/README.md | 12 ++ examples/basic_rewrite/main.go | 40 +++++ go.mod | 25 +++ go.sum | 294 +++++++++++++++++++++++++++++++ middleware.go | 33 ++++ middleware/allowed_hosts.go | 30 ++++ middleware/rewrite_hosts.go | 56 ++++++ options.go | 29 +++ proxy.go | 121 +++++++++++++ util/reverse.go | 7 + wildcard/match.go | 44 +++++ 13 files changed, 701 insertions(+) create mode 100644 README.md create mode 100644 examples/README.md create mode 100644 examples/basic_rewrite/README.md create mode 100644 examples/basic_rewrite/main.go create mode 100644 go.mod create mode 100644 go.sum create mode 100644 middleware.go create mode 100644 middleware/allowed_hosts.go create mode 100644 middleware/rewrite_hosts.go create mode 100644 options.go create mode 100644 proxy.go create mode 100644 util/reverse.go create mode 100644 wildcard/match.go diff --git a/README.md b/README.md new file mode 100644 index 0000000..4f227c9 --- /dev/null +++ b/README.md @@ -0,0 +1,7 @@ +# go-proxy + +HTTP proxy library for Go with middleware capabilities. + +## Examples + +See [`examples/`](./examples/) directory. \ No newline at end of file diff --git a/examples/README.md b/examples/README.md new file mode 100644 index 0000000..2aaf0b6 --- /dev/null +++ b/examples/README.md @@ -0,0 +1,3 @@ +# Examples + +- [`basic_rewrite/`](./basic_rewrite/) - Use static host matching rules to proxy requests to remote servers \ No newline at end of file diff --git a/examples/basic_rewrite/README.md b/examples/basic_rewrite/README.md new file mode 100644 index 0000000..f61fae1 --- /dev/null +++ b/examples/basic_rewrite/README.md @@ -0,0 +1,12 @@ +# Example: Basic rewriting + +This example use the [`WithRewriteHosts()`](../middleware/rewrite_hosts.go) middleware to rewrite incoming requests based on static host matching rules. + +# How to run + +Run with `go run ./examples/basic_rewrite` then open your browser on theses 2 URLs: + +- http://127.0.0.1:3000 +- http://localhost:3000 + +You'll see that the two URLs are targeting two differents remote servers. \ No newline at end of file diff --git a/examples/basic_rewrite/main.go b/examples/basic_rewrite/main.go new file mode 100644 index 0000000..5cdb9aa --- /dev/null +++ b/examples/basic_rewrite/main.go @@ -0,0 +1,40 @@ +package main + +import ( + "log" + "net/http" + "net/url" + + "forge.cadoles.com/Cadoles/go-proxy" + "forge.cadoles.com/Cadoles/go-proxy/middleware" +) + +func main() { + // We declare our url rewritting mappings + mappings := map[string]*url.URL{ + "127.0.0.1:*": mustParse("https://gitea.com"), + "localhost:*": mustParse("https://www.cadoles.com"), + } + + // We create a new proxy with our mappings + proxy := proxy.New( + middleware.WithRewriteHosts(mappings), + ) + + // We start a HTTP server, listening on all interfaces with our proxy + // as an handler + if err := http.ListenAndServe("127.0.0.1:3000", proxy); err != nil { + log.Fatalf("%v", err) + } +} + +// Simple utility function to transform raw urls +// to *url.URL +func mustParse(rawURL string) *url.URL { + url, err := url.Parse(rawURL) + if err != nil { + panic(err) + } + + return url +} diff --git a/go.mod b/go.mod new file mode 100644 index 0000000..14a66c5 --- /dev/null +++ b/go.mod @@ -0,0 +1,25 @@ +module forge.cadoles.com/Cadoles/go-proxy + +go 1.20 + +require ( + github.com/davecgh/go-spew v1.1.1 + github.com/pkg/errors v0.9.1 + gitlab.com/wpetit/goweb v0.0.0-20230419082146-a94d9ed7202b +) + +require ( + cdr.dev/slog v1.4.2 // indirect + github.com/alecthomas/chroma v0.10.0 // indirect + github.com/danwakefield/fnmatch v0.0.0-20160403171240-cbb64ac3d964 // indirect + github.com/dlclark/regexp2 v1.9.0 // indirect + github.com/fatih/color v1.15.0 // indirect + github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da // indirect + github.com/mattn/go-colorable v0.1.13 // indirect + github.com/mattn/go-isatty v0.0.18 // indirect + go.opencensus.io v0.24.0 // indirect + golang.org/x/crypto v0.8.0 // indirect + golang.org/x/sys v0.7.0 // indirect + golang.org/x/term v0.7.0 // indirect + golang.org/x/xerrors v0.0.0-20220907171357-04be3eba64a2 // indirect +) diff --git a/go.sum b/go.sum new file mode 100644 index 0000000..0d7bade --- /dev/null +++ b/go.sum @@ -0,0 +1,294 @@ +cdr.dev/slog v1.4.0/go.mod h1:C5OL99WyuOK8YHZdYY57dAPN1jK2WJlCdq2VP6xeQns= +cdr.dev/slog v1.4.2 h1:fIfiqASYQFJBZiASwL825atyzeA96NsqSxx2aL61P8I= +cdr.dev/slog v1.4.2/go.mod h1:0EkH+GkFNxizNR+GAXUEdUHanxUH5t9zqPILmPM/Vn8= +cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU= +cloud.google.com/go v0.44.1/go.mod 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h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4= +honnef.co/go/tools v0.0.1-2019.2.3/go.mod h1:a3bituU0lyd329TUQxRnasdCoJDkEUEAqEt0JzvZhAg= +rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8= diff --git a/middleware.go b/middleware.go new file mode 100644 index 0000000..b1efb0f --- /dev/null +++ b/middleware.go @@ -0,0 +1,33 @@ +package proxy + +import "net/http" + +type Middleware func(h http.Handler) http.Handler + +type ProxyResponseTransformer interface { + TransformResponse(*http.Response) error +} + +type defaultProxyResponseTransformer struct{} + +// TransformResponse implements ProxyResponseTransformer +func (*defaultProxyResponseTransformer) TransformResponse(*http.Response) error { + return nil +} + +var _ ProxyResponseTransformer = &defaultProxyResponseTransformer{} + +type ProxyResponseMiddleware func(ProxyResponseTransformer) ProxyResponseTransformer + +type ProxyRequestTransformer interface { + TransformRequest(*http.Request) +} + +type ProxyRequestMiddleware func(ProxyRequestTransformer) ProxyRequestTransformer + +type defaultProxyRequestTransformer struct{} + +// TransformRequest implements ProxyRequestTransformer +func (*defaultProxyRequestTransformer) TransformRequest(*http.Request) {} + +var _ ProxyRequestTransformer = &defaultProxyRequestTransformer{} diff --git a/middleware/allowed_hosts.go b/middleware/allowed_hosts.go new file mode 100644 index 0000000..243a56a --- /dev/null +++ b/middleware/allowed_hosts.go @@ -0,0 +1,30 @@ +package middleware + +import ( + "net/http" + + "forge.cadoles.com/Cadoles/go-proxy" + "forge.cadoles.com/Cadoles/go-proxy/wildcard" +) + +func FilterHosts(allowedHostPatterns ...string) proxy.Middleware { + return func(h http.Handler) http.Handler { + fn := func(w http.ResponseWriter, r *http.Request) { + if matches := wildcard.MatchAny(r.Host, allowedHostPatterns...); !matches { + http.Error(w, http.StatusText(http.StatusForbidden), http.StatusForbidden) + + return + } + + h.ServeHTTP(w, r) + } + + return http.HandlerFunc(fn) + } +} + +func WithAllowedHosts(allowedHostPatterns ...string) proxy.OptionFunc { + return func(o *proxy.Options) { + o.Middlewares = append(o.Middlewares, FilterHosts(allowedHostPatterns...)) + } +} diff --git a/middleware/rewrite_hosts.go b/middleware/rewrite_hosts.go new file mode 100644 index 0000000..9fc2448 --- /dev/null +++ b/middleware/rewrite_hosts.go @@ -0,0 +1,56 @@ +package middleware + +import ( + "net/http" + "net/url" + "sort" + + "forge.cadoles.com/Cadoles/go-proxy" + "forge.cadoles.com/Cadoles/go-proxy/util" + "forge.cadoles.com/Cadoles/go-proxy/wildcard" +) + +func RewriteHosts(mappings map[string]*url.URL) proxy.Middleware { + patterns := make([]string, len(mappings)) + + for p := range mappings { + patterns = append(patterns, p) + } + + sort.Strings(patterns) + util.Reverse(patterns) + + return func(h http.Handler) http.Handler { + fn := func(w http.ResponseWriter, r *http.Request) { + var match *url.URL + + for _, p := range patterns { + if matches := wildcard.Match(r.Host, p); !matches { + continue + } + + match = mappings[p] + break + } + + if match == nil { + h.ServeHTTP(w, r) + + return + } + + r.URL.Host = match.Host + r.URL.Scheme = match.Scheme + + h.ServeHTTP(w, r) + } + + return http.HandlerFunc(fn) + } +} + +func WithRewriteHosts(mappings map[string]*url.URL) proxy.OptionFunc { + return func(o *proxy.Options) { + o.Middlewares = append(o.Middlewares, RewriteHosts(mappings)) + } +} diff --git a/options.go b/options.go new file mode 100644 index 0000000..22a6945 --- /dev/null +++ b/options.go @@ -0,0 +1,29 @@ +package proxy + +type Options struct { + Middlewares []Middleware + ProxyRequestMiddlewares []ProxyRequestMiddleware + ProxyResponseMiddlewares []ProxyResponseMiddleware +} + +func defaultOptions() *Options { + return &Options{ + Middlewares: make([]Middleware, 0), + ProxyRequestMiddlewares: make([]ProxyRequestMiddleware, 0), + ProxyResponseMiddlewares: make([]ProxyResponseMiddleware, 0), + } +} + +type OptionFunc func(*Options) + +func WithProxyRequestMiddlewares(middlewares ...ProxyRequestMiddleware) OptionFunc { + return func(o *Options) { + o.ProxyRequestMiddlewares = middlewares + } +} + +func WithproxyResponseMiddlewares(middlewares ...ProxyResponseMiddleware) OptionFunc { + return func(o *Options) { + o.ProxyResponseMiddlewares = middlewares + } +} diff --git a/proxy.go b/proxy.go new file mode 100644 index 0000000..c4ea2b7 --- /dev/null +++ b/proxy.go @@ -0,0 +1,121 @@ +package proxy + +import ( + "fmt" + "net/http" + "net/http/httputil" + "net/url" + "sync" + + "forge.cadoles.com/Cadoles/go-proxy/util" + "github.com/pkg/errors" +) + +type Proxy struct { + reversers sync.Map + handler http.Handler + proxyResponseTransformer ProxyResponseTransformer + proxyRequestTransformer ProxyRequestTransformer +} + +// ServeHTTP implements http.Handler +func (p *Proxy) ServeHTTP(w http.ResponseWriter, r *http.Request) { + p.handler.ServeHTTP(w, r) +} + +func (p *Proxy) proxyRequest(w http.ResponseWriter, r *http.Request) { + var reverser *httputil.ReverseProxy + + key := fmt.Sprintf("%s://%s", r.URL.Scheme, r.URL.Host) + + createAndStore := func() { + target := &url.URL{ + Scheme: r.URL.Scheme, + Host: r.URL.Host, + } + + reverser = httputil.NewSingleHostReverseProxy(target) + + originalDirector := reverser.Director + + if p.proxyRequestTransformer != nil { + reverser.Director = func(r *http.Request) { + originalDirector(r) + p.proxyRequestTransformer.TransformRequest(r) + } + } + + if p.proxyResponseTransformer != nil { + reverser.ModifyResponse = func(r *http.Response) error { + if err := p.proxyResponseTransformer.TransformResponse(r); err != nil { + return errors.WithStack(err) + } + + return nil + } + } + + p.reversers.Store(key, reverser) + } + + raw, exists := p.reversers.Load(key) + if !exists { + createAndStore() + } + + reverser, ok := raw.(*httputil.ReverseProxy) + if !ok { + createAndStore() + } + + reverser.ServeHTTP(w, r) +} + +func New(funcs ...OptionFunc) *Proxy { + opts := defaultOptions() + for _, fn := range funcs { + fn(opts) + } + + proxy := &Proxy{} + + handler := http.HandlerFunc(proxy.proxyRequest) + proxy.handler = createMiddlewareChain(handler, opts.Middlewares) + + proxy.proxyRequestTransformer = createProxyRequestChain(&defaultProxyRequestTransformer{}, opts.ProxyRequestMiddlewares) + proxy.proxyResponseTransformer = createProxyResponseChain(&defaultProxyResponseTransformer{}, opts.ProxyResponseMiddlewares) + + return proxy +} + +var _ http.Handler = &Proxy{} + +func createMiddlewareChain(handler http.Handler, middlewares []Middleware) http.Handler { + util.Reverse(middlewares) + + for _, m := range middlewares { + handler = m(handler) + } + + return handler +} + +func createProxyResponseChain(transformer ProxyResponseTransformer, middlewares []ProxyResponseMiddleware) ProxyResponseTransformer { + util.Reverse(middlewares) + + for _, m := range middlewares { + transformer = m(transformer) + } + + return transformer +} + +func createProxyRequestChain(transformer ProxyRequestTransformer, middlewares []ProxyRequestMiddleware) ProxyRequestTransformer { + util.Reverse(middlewares) + + for _, m := range middlewares { + transformer = m(transformer) + } + + return transformer +} diff --git a/util/reverse.go b/util/reverse.go new file mode 100644 index 0000000..ea0fa93 --- /dev/null +++ b/util/reverse.go @@ -0,0 +1,7 @@ +package util + +func Reverse[S ~[]E, E any](s S) { + for i, j := 0, len(s)-1; i < j; i, j = i+1, j-1 { + s[i], s[j] = s[j], s[i] + } +} diff --git a/wildcard/match.go b/wildcard/match.go new file mode 100644 index 0000000..3c4ce51 --- /dev/null +++ b/wildcard/match.go @@ -0,0 +1,44 @@ +package wildcard + +const wildcard = '*' + +func Match(str, pattern string) bool { + if pattern == "" { + return str == pattern + } + + if pattern == string(wildcard) { + return true + } + + return deepMatchRune([]rune(str), []rune(pattern)) +} + +func MatchAny(str string, patterns ...string) bool { + for _, p := range patterns { + if matches := Match(str, p); matches { + return matches + } + } + + return false +} + +func deepMatchRune(str, pattern []rune) bool { + for len(pattern) > 0 { + switch pattern[0] { + default: + if len(str) == 0 || str[0] != pattern[0] { + return false + } + case wildcard: + return deepMatchRune(str, pattern[1:]) || + (len(str) > 0 && deepMatchRune(str[1:], pattern)) + } + + str = str[1:] + pattern = pattern[1:] + } + + return len(str) == 0 && len(pattern) == 0 +}