diff options
Diffstat (limited to 'vendor/github.com/gorilla/handlers')
| -rw-r--r-- | vendor/github.com/gorilla/handlers/.editorconfig | 20 | ||||
| -rw-r--r-- | vendor/github.com/gorilla/handlers/.gitignore | 2 | ||||
| -rw-r--r-- | vendor/github.com/gorilla/handlers/LICENSE | 27 | ||||
| -rw-r--r-- | vendor/github.com/gorilla/handlers/Makefile | 34 | ||||
| -rw-r--r-- | vendor/github.com/gorilla/handlers/README.md | 56 | ||||
| -rw-r--r-- | vendor/github.com/gorilla/handlers/canonical.go | 73 | ||||
| -rw-r--r-- | vendor/github.com/gorilla/handlers/compress.go | 143 | ||||
| -rw-r--r-- | vendor/github.com/gorilla/handlers/cors.go | 352 | ||||
| -rw-r--r-- | vendor/github.com/gorilla/handlers/doc.go | 9 | ||||
| -rw-r--r-- | vendor/github.com/gorilla/handlers/handlers.go | 150 | ||||
| -rw-r--r-- | vendor/github.com/gorilla/handlers/logging.go | 246 | ||||
| -rw-r--r-- | vendor/github.com/gorilla/handlers/proxy_headers.go | 120 | ||||
| -rw-r--r-- | vendor/github.com/gorilla/handlers/recovery.go | 98 |
13 files changed, 1330 insertions, 0 deletions
diff --git a/vendor/github.com/gorilla/handlers/.editorconfig b/vendor/github.com/gorilla/handlers/.editorconfig new file mode 100644 index 0000000..c6b74c3 --- /dev/null +++ b/vendor/github.com/gorilla/handlers/.editorconfig @@ -0,0 +1,20 @@ +; https://editorconfig.org/ + +root = true + +[*] +insert_final_newline = true +charset = utf-8 +trim_trailing_whitespace = true +indent_style = space +indent_size = 2 + +[{Makefile,go.mod,go.sum,*.go,.gitmodules}] +indent_style = tab +indent_size = 4 + +[*.md] +indent_size = 4 +trim_trailing_whitespace = false + +eclint_indent_style = unset \ No newline at end of file diff --git a/vendor/github.com/gorilla/handlers/.gitignore b/vendor/github.com/gorilla/handlers/.gitignore new file mode 100644 index 0000000..577a89e --- /dev/null +++ b/vendor/github.com/gorilla/handlers/.gitignore @@ -0,0 +1,2 @@ +# Output of the go test coverage tool +coverage.coverprofile diff --git a/vendor/github.com/gorilla/handlers/LICENSE b/vendor/github.com/gorilla/handlers/LICENSE new file mode 100644 index 0000000..bb9d80b --- /dev/null +++ b/vendor/github.com/gorilla/handlers/LICENSE @@ -0,0 +1,27 @@ +Copyright (c) 2023 The Gorilla 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: + + * Redistributions of source code must retain the above copyright +notice, this list of conditions and the following disclaimer. + * 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. + * Neither the name of Google Inc. 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 +OWNER 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. diff --git a/vendor/github.com/gorilla/handlers/Makefile b/vendor/github.com/gorilla/handlers/Makefile new file mode 100644 index 0000000..003b784 --- /dev/null +++ b/vendor/github.com/gorilla/handlers/Makefile @@ -0,0 +1,34 @@ +GO_LINT=$(shell which golangci-lint 2> /dev/null || echo '') +GO_LINT_URI=github.com/golangci/golangci-lint/cmd/golangci-lint@latest + +GO_SEC=$(shell which gosec 2> /dev/null || echo '') +GO_SEC_URI=github.com/securego/gosec/v2/cmd/gosec@latest + +GO_VULNCHECK=$(shell which govulncheck 2> /dev/null || echo '') +GO_VULNCHECK_URI=golang.org/x/vuln/cmd/govulncheck@latest + +.PHONY: verify +verify: sec govulncheck lint test + +.PHONY: lint +lint: + $(if $(GO_LINT), ,go install $(GO_LINT_URI)) + @echo "##### Running golangci-lint #####" + golangci-lint run -v + +.PHONY: sec +sec: + $(if $(GO_SEC), ,go install $(GO_SEC_URI)) + @echo "##### Running gosec #####" + gosec ./... + +.PHONY: govulncheck +govulncheck: + $(if $(GO_VULNCHECK), ,go install $(GO_VULNCHECK_URI)) + @echo "##### Running govulncheck #####" + govulncheck ./... + +.PHONY: test +test: + @echo "##### Running tests #####" + go test -race -cover -coverprofile=coverage.coverprofile -covermode=atomic -v ./... diff --git a/vendor/github.com/gorilla/handlers/README.md b/vendor/github.com/gorilla/handlers/README.md new file mode 100644 index 0000000..02555b2 --- /dev/null +++ b/vendor/github.com/gorilla/handlers/README.md @@ -0,0 +1,56 @@ +# gorilla/handlers + + +[](https://codecov.io/github/gorilla/handlers) +[](https://godoc.org/github.com/gorilla/handlers) +[](https://sourcegraph.com/github.com/gorilla/handlers?badge) + +Package handlers is a collection of handlers (aka "HTTP middleware") for use +with Go's `net/http` package (or any framework supporting `http.Handler`), including: + +* [**LoggingHandler**](https://godoc.org/github.com/gorilla/handlers#LoggingHandler) for logging HTTP requests in the Apache [Common Log + Format](http://httpd.apache.org/docs/2.2/logs.html#common). +* [**CombinedLoggingHandler**](https://godoc.org/github.com/gorilla/handlers#CombinedLoggingHandler) for logging HTTP requests in the Apache [Combined Log + Format](http://httpd.apache.org/docs/2.2/logs.html#combined) commonly used by + both Apache and nginx. +* [**CompressHandler**](https://godoc.org/github.com/gorilla/handlers#CompressHandler) for gzipping responses. +* [**ContentTypeHandler**](https://godoc.org/github.com/gorilla/handlers#ContentTypeHandler) for validating requests against a list of accepted + content types. +* [**MethodHandler**](https://godoc.org/github.com/gorilla/handlers#MethodHandler) for matching HTTP methods against handlers in a + `map[string]http.Handler` +* [**ProxyHeaders**](https://godoc.org/github.com/gorilla/handlers#ProxyHeaders) for populating `r.RemoteAddr` and `r.URL.Scheme` based on the + `X-Forwarded-For`, `X-Real-IP`, `X-Forwarded-Proto` and RFC7239 `Forwarded` + headers when running a Go server behind a HTTP reverse proxy. +* [**CanonicalHost**](https://godoc.org/github.com/gorilla/handlers#CanonicalHost) for re-directing to the preferred host when handling multiple + domains (i.e. multiple CNAME aliases). +* [**RecoveryHandler**](https://godoc.org/github.com/gorilla/handlers#RecoveryHandler) for recovering from unexpected panics. + +Other handlers are documented [on the Gorilla +website](https://www.gorillatoolkit.org/pkg/handlers). + +## Example + +A simple example using `handlers.LoggingHandler` and `handlers.CompressHandler`: + +```go +import ( + "net/http" + "github.com/gorilla/handlers" +) + +func main() { + r := http.NewServeMux() + + // Only log requests to our admin dashboard to stdout + r.Handle("/admin", handlers.LoggingHandler(os.Stdout, http.HandlerFunc(ShowAdminDashboard))) + r.HandleFunc("/", ShowIndex) + + // Wrap our server with our gzip handler to gzip compress all responses. + http.ListenAndServe(":8000", handlers.CompressHandler(r)) +} +``` + +## License + +BSD licensed. See the included LICENSE file for details. + diff --git a/vendor/github.com/gorilla/handlers/canonical.go b/vendor/github.com/gorilla/handlers/canonical.go new file mode 100644 index 0000000..7121f53 --- /dev/null +++ b/vendor/github.com/gorilla/handlers/canonical.go @@ -0,0 +1,73 @@ +package handlers + +import ( + "net/http" + "net/url" + "strings" +) + +type canonical struct { + h http.Handler + domain string + code int +} + +// CanonicalHost is HTTP middleware that re-directs requests to the canonical +// domain. It accepts a domain and a status code (e.g. 301 or 302) and +// re-directs clients to this domain. The existing request path is maintained. +// +// Note: If the provided domain is considered invalid by url.Parse or otherwise +// returns an empty scheme or host, clients are not re-directed. +// +// Example: +// +// r := mux.NewRouter() +// canonical := handlers.CanonicalHost("http://www.gorillatoolkit.org", 302) +// r.HandleFunc("/route", YourHandler) +// +// log.Fatal(http.ListenAndServe(":7000", canonical(r))) +func CanonicalHost(domain string, code int) func(h http.Handler) http.Handler { + fn := func(h http.Handler) http.Handler { + return canonical{h, domain, code} + } + + return fn +} + +func (c canonical) ServeHTTP(w http.ResponseWriter, r *http.Request) { + dest, err := url.Parse(c.domain) + if err != nil { + // Call the next handler if the provided domain fails to parse. + c.h.ServeHTTP(w, r) + return + } + + if dest.Scheme == "" || dest.Host == "" { + // Call the next handler if the scheme or host are empty. + // Note that url.Parse won't fail on in this case. + c.h.ServeHTTP(w, r) + return + } + + if !strings.EqualFold(cleanHost(r.Host), dest.Host) { + // Re-build the destination URL + dest := dest.Scheme + "://" + dest.Host + r.URL.Path + if r.URL.RawQuery != "" { + dest += "?" + r.URL.RawQuery + } + http.Redirect(w, r, dest, c.code) + return + } + + c.h.ServeHTTP(w, r) +} + +// cleanHost cleans invalid Host headers by stripping anything after '/' or ' '. +// This is backported from Go 1.5 (in response to issue #11206) and attempts to +// mitigate malformed Host headers that do not match the format in RFC7230. +func cleanHost(in string) string { + if i := strings.IndexAny(in, " /"); i != -1 { + return in[:i] + } + return in +} diff --git a/vendor/github.com/gorilla/handlers/compress.go b/vendor/github.com/gorilla/handlers/compress.go new file mode 100644 index 0000000..d6f5895 --- /dev/null +++ b/vendor/github.com/gorilla/handlers/compress.go @@ -0,0 +1,143 @@ +// Copyright 2013 The Gorilla 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 handlers + +import ( + "compress/flate" + "compress/gzip" + "io" + "net/http" + "strings" + + "github.com/felixge/httpsnoop" +) + +const acceptEncoding string = "Accept-Encoding" + +type compressResponseWriter struct { + compressor io.Writer + w http.ResponseWriter +} + +func (cw *compressResponseWriter) WriteHeader(c int) { + cw.w.Header().Del("Content-Length") + cw.w.WriteHeader(c) +} + +func (cw *compressResponseWriter) Write(b []byte) (int, error) { + h := cw.w.Header() + if h.Get("Content-Type") == "" { + h.Set("Content-Type", http.DetectContentType(b)) + } + h.Del("Content-Length") + + return cw.compressor.Write(b) +} + +func (cw *compressResponseWriter) ReadFrom(r io.Reader) (int64, error) { + return io.Copy(cw.compressor, r) +} + +type flusher interface { + Flush() error +} + +func (cw *compressResponseWriter) Flush() { + // Flush compressed data if compressor supports it. + if f, ok := cw.compressor.(flusher); ok { + _ = f.Flush() + } + // Flush HTTP response. + if f, ok := cw.w.(http.Flusher); ok { + f.Flush() + } +} + +// CompressHandler gzip compresses HTTP responses for clients that support it +// via the 'Accept-Encoding' header. +// +// Compressing TLS traffic may leak the page contents to an attacker if the +// page contains user input: http://security.stackexchange.com/a/102015/12208 +func CompressHandler(h http.Handler) http.Handler { + return CompressHandlerLevel(h, gzip.DefaultCompression) +} + +// CompressHandlerLevel gzip compresses HTTP responses with specified compression level +// for clients that support it via the 'Accept-Encoding' header. +// +// The compression level should be gzip.DefaultCompression, gzip.NoCompression, +// or any integer value between gzip.BestSpeed and gzip.BestCompression inclusive. +// gzip.DefaultCompression is used in case of invalid compression level. +func CompressHandlerLevel(h http.Handler, level int) http.Handler { + if level < gzip.DefaultCompression || level > gzip.BestCompression { + level = gzip.DefaultCompression + } + + const ( + gzipEncoding = "gzip" + flateEncoding = "deflate" + ) + + return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { + // detect what encoding to use + var encoding string + for _, curEnc := range strings.Split(r.Header.Get(acceptEncoding), ",") { + curEnc = strings.TrimSpace(curEnc) + if curEnc == gzipEncoding || curEnc == flateEncoding { + encoding = curEnc + break + } + } + + // always add Accept-Encoding to Vary to prevent intermediate caches corruption + w.Header().Add("Vary", acceptEncoding) + + // if we weren't able to identify an encoding we're familiar with, pass on the + // request to the handler and return + if encoding == "" { + h.ServeHTTP(w, r) + return + } + + if r.Header.Get("Upgrade") != "" { + h.ServeHTTP(w, r) + return + } + + // wrap the ResponseWriter with the writer for the chosen encoding + var encWriter io.WriteCloser + if encoding == gzipEncoding { + encWriter, _ = gzip.NewWriterLevel(w, level) + } else if encoding == flateEncoding { + encWriter, _ = flate.NewWriter(w, level) + } + defer encWriter.Close() + + w.Header().Set("Content-Encoding", encoding) + r.Header.Del(acceptEncoding) + + cw := &compressResponseWriter{ + w: w, + compressor: encWriter, + } + + w = httpsnoop.Wrap(w, httpsnoop.Hooks{ + Write: func(httpsnoop.WriteFunc) httpsnoop.WriteFunc { + return cw.Write + }, + WriteHeader: func(httpsnoop.WriteHeaderFunc) httpsnoop.WriteHeaderFunc { + return cw.WriteHeader + }, + Flush: func(httpsnoop.FlushFunc) httpsnoop.FlushFunc { + return cw.Flush + }, + ReadFrom: func(rff httpsnoop.ReadFromFunc) httpsnoop.ReadFromFunc { + return cw.ReadFrom + }, + }) + + h.ServeHTTP(w, r) + }) +} diff --git a/vendor/github.com/gorilla/handlers/cors.go b/vendor/github.com/gorilla/handlers/cors.go new file mode 100644 index 0000000..8af9c09 --- /dev/null +++ b/vendor/github.com/gorilla/handlers/cors.go @@ -0,0 +1,352 @@ +package handlers + +import ( + "net/http" + "strconv" + "strings" +) + +// CORSOption represents a functional option for configuring the CORS middleware. +type CORSOption func(*cors) error + +type cors struct { + h http.Handler + allowedHeaders []string + allowedMethods []string + allowedOrigins []string + allowedOriginValidator OriginValidator + exposedHeaders []string + maxAge int + ignoreOptions bool + allowCredentials bool + optionStatusCode int +} + +// OriginValidator takes an origin string and returns whether or not that origin is allowed. +type OriginValidator func(string) bool + +var ( + defaultCorsOptionStatusCode = http.StatusOK + defaultCorsMethods = []string{http.MethodGet, http.MethodHead, http.MethodPost} + defaultCorsHeaders = []string{"Accept", "Accept-Language", "Content-Language", "Origin"} + // (WebKit/Safari v9 sends the Origin header by default in AJAX requests). +) + +const ( + corsOptionMethod string = http.MethodOptions + corsAllowOriginHeader string = "Access-Control-Allow-Origin" + corsExposeHeadersHeader string = "Access-Control-Expose-Headers" + corsMaxAgeHeader string = "Access-Control-Max-Age" + corsAllowMethodsHeader string = "Access-Control-Allow-Methods" + corsAllowHeadersHeader string = "Access-Control-Allow-Headers" + corsAllowCredentialsHeader string = "Access-Control-Allow-Credentials" + corsRequestMethodHeader string = "Access-Control-Request-Method" + corsRequestHeadersHeader string = "Access-Control-Request-Headers" + corsOriginHeader string = "Origin" + corsVaryHeader string = "Vary" + corsOriginMatchAll string = "*" +) + +func (ch *cors) ServeHTTP(w http.ResponseWriter, r *http.Request) { + origin := r.Header.Get(corsOriginHeader) + if !ch.isOriginAllowed(origin) { + if r.Method != corsOptionMethod || ch.ignoreOptions { + ch.h.ServeHTTP(w, r) + } + + return + } + + if r.Method == corsOptionMethod { + if ch.ignoreOptions { + ch.h.ServeHTTP(w, r) + return + } + + if _, ok := r.Header[corsRequestMethodHeader]; !ok { + w.WriteHeader(http.StatusBadRequest) + return + } + + method := r.Header.Get(corsRequestMethodHeader) + if !ch.isMatch(method, ch.allowedMethods) { + w.WriteHeader(http.StatusMethodNotAllowed) + return + } + + requestHeaders := strings.Split(r.Header.Get(corsRequestHeadersHeader), ",") + allowedHeaders := []string{} + for _, v := range requestHeaders { + canonicalHeader := http.CanonicalHeaderKey(strings.TrimSpace(v)) + if canonicalHeader == "" || ch.isMatch(canonicalHeader, defaultCorsHeaders) { + continue + } + + if !ch.isMatch(canonicalHeader, ch.allowedHeaders) { + w.WriteHeader(http.StatusForbidden) + return + } + + allowedHeaders = append(allowedHeaders, canonicalHeader) + } + + if len(allowedHeaders) > 0 { + w.Header().Set(corsAllowHeadersHeader, strings.Join(allowedHeaders, ",")) + } + + if ch.maxAge > 0 { + w.Header().Set(corsMaxAgeHeader, strconv.Itoa(ch.maxAge)) + } + + if !ch.isMatch(method, defaultCorsMethods) { + w.Header().Set(corsAllowMethodsHeader, method) + } + } else if len(ch.exposedHeaders) > 0 { + w.Header().Set(corsExposeHeadersHeader, strings.Join(ch.exposedHeaders, ",")) + } + + if ch.allowCredentials { + w.Header().Set(corsAllowCredentialsHeader, "true") + } + + if len(ch.allowedOrigins) > 1 { + w.Header().Set(corsVaryHeader, corsOriginHeader) + } + + returnOrigin := origin + if ch.allowedOriginValidator == nil && len(ch.allowedOrigins) == 0 { + returnOrigin = "*" + } else { + for _, o := range ch.allowedOrigins { + // A configuration of * is different than explicitly setting an allowed + // origin. Returning arbitrary origin headers in an access control allow + // origin header is unsafe and is not required by any use case. + if o == corsOriginMatchAll { + returnOrigin = "*" + break + } + } + } + w.Header().Set(corsAllowOriginHeader, returnOrigin) + + if r.Method == corsOptionMethod { + w.WriteHeader(ch.optionStatusCode) + return + } + ch.h.ServeHTTP(w, r) +} + +// CORS provides Cross-Origin Resource Sharing middleware. +// Example: +// +// import ( +// "net/http" +// +// "github.com/gorilla/handlers" +// "github.com/gorilla/mux" +// ) +// +// func main() { +// r := mux.NewRouter() +// r.HandleFunc("/users", UserEndpoint) +// r.HandleFunc("/projects", ProjectEndpoint) +// +// // Apply the CORS middleware to our top-level router, with the defaults. +// http.ListenAndServe(":8000", handlers.CORS()(r)) +// } +func CORS(opts ...CORSOption) func(http.Handler) http.Handler { + return func(h http.Handler) http.Handler { + ch := parseCORSOptions(opts...) + ch.h = h + return ch + } +} + +func parseCORSOptions(opts ...CORSOption) *cors { + ch := &cors{ + allowedMethods: defaultCorsMethods, + allowedHeaders: defaultCorsHeaders, + allowedOrigins: []string{}, + optionStatusCode: defaultCorsOptionStatusCode, + } + + for _, option := range opts { + _ = option(ch) //TODO: @bharat-rajani, return error to caller if not nil? + } + + return ch +} + +// +// Functional options for configuring CORS. +// + +// AllowedHeaders adds the provided headers to the list of allowed headers in a +// CORS request. +// This is an append operation so the headers Accept, Accept-Language, +// and Content-Language are always allowed. +// Content-Type must be explicitly declared if accepting Content-Types other than +// application/x-www-form-urlencoded, multipart/form-data, or text/plain. +func AllowedHeaders(headers []string) CORSOption { + return func(ch *cors) error { + for _, v := range headers { + normalizedHeader := http.CanonicalHeaderKey(strings.TrimSpace(v)) + if normalizedHeader == "" { + continue + } + + if !ch.isMatch(normalizedHeader, ch.allowedHeaders) { + ch.allowedHeaders = append(ch.allowedHeaders, normalizedHeader) + } + } + + return nil + } +} + +// AllowedMethods can be used to explicitly allow methods in the +// Access-Control-Allow-Methods header. +// This is a replacement operation so you must also +// pass GET, HEAD, and POST if you wish to support those methods. +func AllowedMethods(methods []string) CORSOption { + return func(ch *cors) error { + ch.allowedMethods = []string{} + for _, v := range methods { + normalizedMethod := strings.ToUpper(strings.TrimSpace(v)) + if normalizedMethod == "" { + continue + } + + if !ch.isMatch(normalizedMethod, ch.allowedMethods) { + ch.allowedMethods = append(ch.allowedMethods, normalizedMethod) + } + } + + return nil + } +} + +// AllowedOrigins sets the allowed origins for CORS requests, as used in the +// 'Allow-Access-Control-Origin' HTTP header. +// Note: Passing in a []string{"*"} will allow any domain. +func AllowedOrigins(origins []string) CORSOption { + return func(ch *cors) error { + for _, v := range origins { + if v == corsOriginMatchAll { + ch.allowedOrigins = []string{corsOriginMatchAll} + return nil + } + } + + ch.allowedOrigins = origins + return nil + } +} + +// AllowedOriginValidator sets a function for evaluating allowed origins in CORS requests, represented by the +// 'Allow-Access-Control-Origin' HTTP header. +func AllowedOriginValidator(fn OriginValidator) CORSOption { + return func(ch *cors) error { + ch.allowedOriginValidator = fn + return nil + } +} + +// OptionStatusCode sets a custom status code on the OPTIONS requests. +// Default behaviour sets it to 200 to reflect best practices. This is option is not mandatory +// and can be used if you need a custom status code (i.e 204). +// +// More informations on the spec: +// https://fetch.spec.whatwg.org/#cors-preflight-fetch +func OptionStatusCode(code int) CORSOption { + return func(ch *cors) error { + ch.optionStatusCode = code + return nil + } +} + +// ExposedHeaders can be used to specify headers that are available +// and will not be stripped out by the user-agent. +func ExposedHeaders(headers []string) CORSOption { + return func(ch *cors) error { + ch.exposedHeaders = []string{} + for _, v := range headers { + normalizedHeader := http.CanonicalHeaderKey(strings.TrimSpace(v)) + if normalizedHeader == "" { + continue + } + + if !ch.isMatch(normalizedHeader, ch.exposedHeaders) { + ch.exposedHeaders = append(ch.exposedHeaders, normalizedHeader) + } + } + + return nil + } +} + +// MaxAge determines the maximum age (in seconds) between preflight requests. A +// maximum of 10 minutes is allowed. An age above this value will default to 10 +// minutes. +func MaxAge(age int) CORSOption { + return func(ch *cors) error { + // Maximum of 10 minutes. + if age > 600 { + age = 600 + } + + ch.maxAge = age + return nil + } +} + +// IgnoreOptions causes the CORS middleware to ignore OPTIONS requests, instead +// passing them through to the next handler. This is useful when your application +// or framework has a pre-existing mechanism for responding to OPTIONS requests. +func IgnoreOptions() CORSOption { + return func(ch *cors) error { + ch.ignoreOptions = true + return nil + } +} + +// AllowCredentials can be used to specify that the user agent may pass +// authentication details along with the request. +func AllowCredentials() CORSOption { + return func(ch *cors) error { + ch.allowCredentials = true + return nil + } +} + +func (ch *cors) isOriginAllowed(origin string) bool { + if origin == "" { + return false + } + + if ch.allowedOriginValidator != nil { + return ch.allowedOriginValidator(origin) + } + + if len(ch.allowedOrigins) == 0 { + return true + } + + for _, allowedOrigin := range ch.allowedOrigins { + if allowedOrigin == origin || allowedOrigin == corsOriginMatchAll { + return true + } + } + + return false +} + +func (ch *cors) isMatch(needle string, haystack []string) bool { + for _, v := range haystack { + if v == needle { + return true + } + } + + return false +} diff --git a/vendor/github.com/gorilla/handlers/doc.go b/vendor/github.com/gorilla/handlers/doc.go new file mode 100644 index 0000000..944e5a8 --- /dev/null +++ b/vendor/github.com/gorilla/handlers/doc.go @@ -0,0 +1,9 @@ +/* +Package handlers is a collection of handlers (aka "HTTP middleware") for use +with Go's net/http package (or any framework supporting http.Handler). + +The package includes handlers for logging in standardised formats, compressing +HTTP responses, validating content types and other useful tools for manipulating +requests and responses. +*/ +package handlers diff --git a/vendor/github.com/gorilla/handlers/handlers.go b/vendor/github.com/gorilla/handlers/handlers.go new file mode 100644 index 0000000..9b92fce --- /dev/null +++ b/vendor/github.com/gorilla/handlers/handlers.go @@ -0,0 +1,150 @@ +// Copyright 2013 The Gorilla 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 handlers + +import ( + "bufio" + "fmt" + "net" + "net/http" + "sort" + "strings" +) + +// MethodHandler is an http.Handler that dispatches to a handler whose key in the +// MethodHandler's map matches the name of the HTTP request's method, eg: GET +// +// If the request's method is OPTIONS and OPTIONS is not a key in the map then +// the handler responds with a status of 200 and sets the Allow header to a +// comma-separated list of available methods. +// +// If the request's method doesn't match any of its keys the handler responds +// with a status of HTTP 405 "Method Not Allowed" and sets the Allow header to a +// comma-separated list of available methods. +type MethodHandler map[string]http.Handler + +func (h MethodHandler) ServeHTTP(w http.ResponseWriter, req *http.Request) { + if handler, ok := h[req.Method]; ok { + handler.ServeHTTP(w, req) + } else { + allow := []string{} + for k := range h { + allow = append(allow, k) + } + sort.Strings(allow) + w.Header().Set("Allow", strings.Join(allow, ", ")) + if req.Method == http.MethodOptions { + w.WriteHeader(http.StatusOK) + } else { + http.Error(w, "Method not allowed", http.StatusMethodNotAllowed) + } + } +} + +// responseLogger is wrapper of http.ResponseWriter that keeps track of its HTTP +// status code and body size. +type responseLogger struct { + w http.ResponseWriter + status int + size int +} + +func (l *responseLogger) Write(b []byte) (int, error) { + size, err := l.w.Write(b) + l.size += size + return size, err +} + +func (l *responseLogger) WriteHeader(s int) { + l.w.WriteHeader(s) + l.status = s +} + +func (l *responseLogger) Status() int { + return l.status +} + +func (l *responseLogger) Size() int { + return l.size +} + +func (l *responseLogger) Hijack() (net.Conn, *bufio.ReadWriter, error) { + conn, rw, err := l.w.(http.Hijacker).Hijack() + if err == nil && l.status == 0 { + // The status will be StatusSwitchingProtocols if there was no error and + // WriteHeader has not been called yet + l.status = http.StatusSwitchingProtocols + } + return conn, rw, err +} + +// isContentType validates the Content-Type header matches the supplied +// contentType. That is, its type and subtype match. +func isContentType(h http.Header, contentType string) bool { + ct := h.Get("Content-Type") + if i := strings.IndexRune(ct, ';'); i != -1 { + ct = ct[0:i] + } + return ct == contentType +} + +// ContentTypeHandler wraps and returns a http.Handler, validating the request +// content type is compatible with the contentTypes list. It writes a HTTP 415 +// error if that fails. +// +// Only PUT, POST, and PATCH requests are considered. +func ContentTypeHandler(h http.Handler, contentTypes ...string) http.Handler { + return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { + if !(r.Method == http.MethodPut || r.Method == http.MethodPost || r.Method == http.MethodPatch) { + h.ServeHTTP(w, r) + return + } + + for _, ct := range contentTypes { + if isContentType(r.Header, ct) { + h.ServeHTTP(w, r) + return + } + } + http.Error(w, fmt.Sprintf("Unsupported content type %q; expected one of %q", + r.Header.Get("Content-Type"), + contentTypes), + http.StatusUnsupportedMediaType) + }) +} + +const ( + // HTTPMethodOverrideHeader is a commonly used + // http header to override a request method. + HTTPMethodOverrideHeader = "X-HTTP-Method-Override" + // HTTPMethodOverrideFormKey is a commonly used + // HTML form key to override a request method. + HTTPMethodOverrideFormKey = "_method" +) + +// HTTPMethodOverrideHandler wraps and returns a http.Handler which checks for +// the X-HTTP-Method-Override header or the _method form key, and overrides (if +// valid) request.Method with its value. +// +// This is especially useful for HTTP clients that don't support many http verbs. +// It isn't secure to override e.g a GET to a POST, so only POST requests are +// considered. Likewise, the override method can only be a "write" method: PUT, +// PATCH or DELETE. +// +// Form method takes precedence over header method. +func HTTPMethodOverrideHandler(h http.Handler) http.Handler { + return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { + if r.Method == http.MethodPost { + om := r.FormValue(HTTPMethodOverrideFormKey) + if om == "" { + om = r.Header.Get(HTTPMethodOverrideHeader) + } + if om == http.MethodPut || om == http.MethodPatch || om == http.MethodDelete { + r.Method = om + } + } + h.ServeHTTP(w, r) + }) +} diff --git a/vendor/github.com/gorilla/handlers/logging.go b/vendor/github.com/gorilla/handlers/logging.go new file mode 100644 index 0000000..2badb6f --- /dev/null +++ b/vendor/github.com/gorilla/handlers/logging.go @@ -0,0 +1,246 @@ +// Copyright 2013 The Gorilla 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 handlers + +import ( + "io" + "net" + "net/http" + "net/url" + "strconv" + "time" + "unicode/utf8" + + "github.com/felixge/httpsnoop" +) + +// Logging + +// LogFormatterParams is the structure any formatter will be handed when time to log comes. +type LogFormatterParams struct { + Request *http.Request + URL url.URL + TimeStamp time.Time + StatusCode int + Size int +} + +// LogFormatter gives the signature of the formatter function passed to CustomLoggingHandler. +type LogFormatter func(writer io.Writer, params LogFormatterParams) + +// loggingHandler is the http.Handler implementation for LoggingHandlerTo and its +// friends + +type loggingHandler struct { + writer io.Writer + handler http.Handler + formatter LogFormatter +} + +func (h loggingHandler) ServeHTTP(w http.ResponseWriter, req *http.Request) { + t := time.Now() + logger, w := makeLogger(w) + url := *req.URL + + h.handler.ServeHTTP(w, req) + if req.MultipartForm != nil { + err := req.MultipartForm.RemoveAll() + if err != nil { + return + } + } + + params := LogFormatterParams{ + Request: req, + URL: url, + TimeStamp: t, + StatusCode: logger.Status(), + Size: logger.Size(), + } + + h.formatter(h.writer, params) +} + +func makeLogger(w http.ResponseWriter) (*responseLogger, http.ResponseWriter) { + logger := &responseLogger{w: w, status: http.StatusOK} + return logger, httpsnoop.Wrap(w, httpsnoop.Hooks{ + Write: func(httpsnoop.WriteFunc) httpsnoop.WriteFunc { + return logger.Write + }, + WriteHeader: func(httpsnoop.WriteHeaderFunc) httpsnoop.WriteHeaderFunc { + return logger.WriteHeader + }, + }) +} + +const lowerhex = "0123456789abcdef" + +func appendQuoted(buf []byte, s string) []byte { + var runeTmp [utf8.UTFMax]byte + for width := 0; len(s) > 0; s = s[width:] { //nolint: wastedassign //TODO: why width starts from 0and reassigned as 1 + r := rune(s[0]) + width = 1 + if r >= utf8.RuneSelf { + r, width = utf8.DecodeRuneInString(s) + } + if width == 1 && r == utf8.RuneError { + buf = append(buf, `\x`...) + buf = append(buf, lowerhex[s[0]>>4]) + buf = append(buf, lowerhex[s[0]&0xF]) + continue + } + if r == rune('"') || r == '\\' { // always backslashed + buf = append(buf, '\\') + buf = append(buf, byte(r)) + continue + } + if strconv.IsPrint(r) { + n := utf8.EncodeRune(runeTmp[:], r) + buf = append(buf, runeTmp[:n]...) + continue + } + switch r { + case '\a': + buf = append(buf, `\a`...) + case '\b': + buf = append(buf, `\b`...) + case '\f': + buf = append(buf, `\f`...) + case '\n': + buf = append(buf, `\n`...) + case '\r': + buf = append(buf, `\r`...) + case '\t': + buf = append(buf, `\t`...) + case '\v': + buf = append(buf, `\v`...) + default: + switch { + case r < ' ': + buf = append(buf, `\x`...) + buf = append(buf, lowerhex[s[0]>>4]) + buf = append(buf, lowerhex[s[0]&0xF]) + case r > utf8.MaxRune: + r = 0xFFFD + fallthrough + case r < 0x10000: + buf = append(buf, `\u`...) + for s := 12; s >= 0; s -= 4 { + buf = append(buf, lowerhex[r>>uint(s)&0xF]) + } + default: + buf = append(buf, `\U`...) + for s := 28; s >= 0; s -= 4 { + buf = append(buf, lowerhex[r>>uint(s)&0xF]) + } + } + } + } + return buf +} + +// buildCommonLogLine builds a log entry for req in Apache Common Log Format. +// ts is the timestamp with which the entry should be logged. +// status and size are used to provide the response HTTP status and size. +func buildCommonLogLine(req *http.Request, url url.URL, ts time.Time, status int, size int) []byte { + username := "-" + if url.User != nil { + if name := url.User.Username(); name != "" { + username = name + } + } + + host, _, err := net.SplitHostPort(req.RemoteAddr) + if err != nil { + host = req.RemoteAddr + } + + uri := req.RequestURI + + // Requests using the CONNECT method over HTTP/2.0 must use + // the authority field (aka r.Host) to identify the target. + // Refer: https://httpwg.github.io/specs/rfc7540.html#CONNECT + if req.ProtoMajor == 2 && req.Method == "CONNECT" { + uri = req.Host + } + if uri == "" { + uri = url.RequestURI() + } + + buf := make([]byte, 0, 3*(len(host)+len(username)+len(req.Method)+len(uri)+len(req.Proto)+50)/2) + buf = append(buf, host...) + buf = append(buf, " - "...) + buf = append(buf, username...) + buf = append(buf, " ["...) + buf = append(buf, ts.Format("02/Jan/2006:15:04:05 -0700")...) + buf = append(buf, `] "`...) + buf = append(buf, req.Method...) + buf = append(buf, " "...) + buf = appendQuoted(buf, uri) + buf = append(buf, " "...) + buf = append(buf, req.Proto...) + buf = append(buf, `" `...) + buf = append(buf, strconv.Itoa(status)...) + buf = append(buf, " "...) + buf = append(buf, strconv.Itoa(size)...) + return buf +} + +// writeLog writes a log entry for req to w in Apache Common Log Format. +// ts is the timestamp with which the entry should be logged. +// status and size are used to provide the response HTTP status and size. +func writeLog(writer io.Writer, params LogFormatterParams) { + buf := buildCommonLogLine(params.Request, params.URL, params.TimeStamp, params.StatusCode, params.Size) + buf = append(buf, '\n') + _, _ = writer.Write(buf) +} + +// writeCombinedLog writes a log entry for req to w in Apache Combined Log Format. +// ts is the timestamp with which the entry should be logged. +// status and size are used to provide the response HTTP status and size. +func writeCombinedLog(writer io.Writer, params LogFormatterParams) { + buf := buildCommonLogLine(params.Request, params.URL, params.TimeStamp, params.StatusCode, params.Size) + buf = append(buf, ` "`...) + buf = appendQuoted(buf, params.Request.Referer()) + buf = append(buf, `" "`...) + buf = appendQuoted(buf, params.Request.UserAgent()) + buf = append(buf, '"', '\n') + _, _ = writer.Write(buf) +} + +// CombinedLoggingHandler return a http.Handler that wraps h and logs requests to out in +// Apache Combined Log Format. +// +// See http://httpd.apache.org/docs/2.2/logs.html#combined for a description of this format. +// +// LoggingHandler always sets the ident field of the log to -. +func CombinedLoggingHandler(out io.Writer, h http.Handler) http.Handler { + return loggingHandler{out, h, writeCombinedLog} +} + +// LoggingHandler return a http.Handler that wraps h and logs requests to out in +// Apache Common Log Format (CLF). +// +// See http://httpd.apache.org/docs/2.2/logs.html#common for a description of this format. +// +// LoggingHandler always sets the ident field of the log to - +// +// Example: +// +// r := mux.NewRouter() +// r.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) { +// w.Write([]byte("This is a catch-all route")) +// }) +// loggedRouter := handlers.LoggingHandler(os.Stdout, r) +// http.ListenAndServe(":1123", loggedRouter) +func LoggingHandler(out io.Writer, h http.Handler) http.Handler { + return loggingHandler{out, h, writeLog} +} + +// CustomLoggingHandler provides a way to supply a custom log formatter +// while taking advantage of the mechanisms in this package. +func CustomLoggingHandler(out io.Writer, h http.Handler, f LogFormatter) http.Handler { + return loggingHandler{out, h, f} +} diff --git a/vendor/github.com/gorilla/handlers/proxy_headers.go b/vendor/github.com/gorilla/handlers/proxy_headers.go new file mode 100644 index 0000000..281d753 --- /dev/null +++ b/vendor/github.com/gorilla/handlers/proxy_headers.go @@ -0,0 +1,120 @@ +package handlers + +import ( + "net/http" + "regexp" + "strings" +) + +var ( + // De-facto standard header keys. + xForwardedFor = http.CanonicalHeaderKey("X-Forwarded-For") + xForwardedHost = http.CanonicalHeaderKey("X-Forwarded-Host") + xForwardedProto = http.CanonicalHeaderKey("X-Forwarded-Proto") + xForwardedScheme = http.CanonicalHeaderKey("X-Forwarded-Scheme") + xRealIP = http.CanonicalHeaderKey("X-Real-IP") +) + +var ( + // RFC7239 defines a new "Forwarded: " header designed to replace the + // existing use of X-Forwarded-* headers. + // e.g. Forwarded: for=192.0.2.60;proto=https;by=203.0.113.43. + forwarded = http.CanonicalHeaderKey("Forwarded") + // Allows for a sub-match of the first value after 'for=' to the next + // comma, semi-colon or space. The match is case-insensitive. + forRegex = regexp.MustCompile(`(?i)(?:for=)([^(;|,| )]+)`) + // Allows for a sub-match for the first instance of scheme (http|https) + // prefixed by 'proto='. The match is case-insensitive. + protoRegex = regexp.MustCompile(`(?i)(?:proto=)(https|http)`) +) + +// ProxyHeaders inspects common reverse proxy headers and sets the corresponding +// fields in the HTTP request struct. These are X-Forwarded-For and X-Real-IP +// for the remote (client) IP address, X-Forwarded-Proto or X-Forwarded-Scheme +// for the scheme (http|https), X-Forwarded-Host for the host and the RFC7239 +// Forwarded header, which may include both client IPs and schemes. +// +// NOTE: This middleware should only be used when behind a reverse +// proxy like nginx, HAProxy or Apache. Reverse proxies that don't (or are +// configured not to) strip these headers from client requests, or where these +// headers are accepted "as is" from a remote client (e.g. when Go is not behind +// a proxy), can manifest as a vulnerability if your application uses these +// headers for validating the 'trustworthiness' of a request. +func ProxyHeaders(h http.Handler) http.Handler { + fn := func(w http.ResponseWriter, r *http.Request) { + // Set the remote IP with the value passed from the proxy. + if fwd := getIP(r); fwd != "" { + r.RemoteAddr = fwd + } + + // Set the scheme (proto) with the value passed from the proxy. + if scheme := getScheme(r); scheme != "" { + r.URL.Scheme = scheme + } + // Set the host with the value passed by the proxy + if r.Header.Get(xForwardedHost) != "" { + r.Host = r.Header.Get(xForwardedHost) + } + // Call the next handler in the chain. + h.ServeHTTP(w, r) + } + + return http.HandlerFunc(fn) +} + +// getIP retrieves the IP from the X-Forwarded-For, X-Real-IP and RFC7239 +// Forwarded headers (in that order). +func getIP(r *http.Request) string { + var addr string + + switch { + case r.Header.Get(xForwardedFor) != "": + fwd := r.Header.Get(xForwardedFor) + // Only grab the first (client) address. Note that '192.168.0.1, + // 10.1.1.1' is a valid key for X-Forwarded-For where addresses after + // the first may represent forwarding proxies earlier in the chain. + s := strings.Index(fwd, ", ") + if s == -1 { + s = len(fwd) + } + addr = fwd[:s] + case r.Header.Get(xRealIP) != "": + addr = r.Header.Get(xRealIP) + case r.Header.Get(forwarded) != "": + // match should contain at least two elements if the protocol was + // specified in the Forwarded header. The first element will always be + // the 'for=' capture, which we ignore. In the case of multiple IP + // addresses (for=8.8.8.8, 8.8.4.4,172.16.1.20 is valid) we only + // extract the first, which should be the client IP. + if match := forRegex.FindStringSubmatch(r.Header.Get(forwarded)); len(match) > 1 { + // IPv6 addresses in Forwarded headers are quoted-strings. We strip + // these quotes. + addr = strings.Trim(match[1], `"`) + } + } + + return addr +} + +// getScheme retrieves the scheme from the X-Forwarded-Proto and RFC7239 +// Forwarded headers (in that order). +func getScheme(r *http.Request) string { + var scheme string + + // Retrieve the scheme from X-Forwarded-Proto. + if proto := r.Header.Get(xForwardedProto); proto != "" { + scheme = strings.ToLower(proto) + } else if proto = r.Header.Get(xForwardedScheme); proto != "" { + scheme = strings.ToLower(proto) + } else if proto = r.Header.Get(forwarded); proto != "" { + // match should contain at least two elements if the protocol was + // specified in the Forwarded header. The first element will always be + // the 'proto=' capture, which we ignore. In the case of multiple proto + // parameters (invalid) we only extract the first. + if match := protoRegex.FindStringSubmatch(proto); len(match) > 1 { + scheme = strings.ToLower(match[1]) + } + } + + return scheme +} diff --git a/vendor/github.com/gorilla/handlers/recovery.go b/vendor/github.com/gorilla/handlers/recovery.go new file mode 100644 index 0000000..0d4f955 --- /dev/null +++ b/vendor/github.com/gorilla/handlers/recovery.go @@ -0,0 +1,98 @@ +package handlers + +import ( + "log" + "net/http" + "runtime/debug" +) + +// RecoveryHandlerLogger is an interface used by the recovering handler to print logs. +type RecoveryHandlerLogger interface { + Println(...interface{}) +} + +type recoveryHandler struct { + handler http.Handler + logger RecoveryHandlerLogger + printStack bool +} + +// RecoveryOption provides a functional approach to define +// configuration for a handler; such as setting the logging +// whether or not to print stack traces on panic. +type RecoveryOption func(http.Handler) + +func parseRecoveryOptions(h http.Handler, opts ...RecoveryOption) http.Handler { + for _, option := range opts { + option(h) + } + + return h +} + +// RecoveryHandler is HTTP middleware that recovers from a panic, +// logs the panic, writes http.StatusInternalServerError, and +// continues to the next handler. +// +// Example: +// +// r := mux.NewRouter() +// r.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) { +// panic("Unexpected error!") +// }) +// +// http.ListenAndServe(":1123", handlers.RecoveryHandler()(r)) +func RecoveryHandler(opts ...RecoveryOption) func(h http.Handler) http.Handler { + return func(h http.Handler) http.Handler { + r := &recoveryHandler{handler: h} + return parseRecoveryOptions(r, opts...) + } +} + +// RecoveryLogger is a functional option to override +// the default logger. +func RecoveryLogger(logger RecoveryHandlerLogger) RecoveryOption { + return func(h http.Handler) { + r := h.(*recoveryHandler) //nolint:errcheck //TODO: + // @bharat-rajani should return type-assertion error but would break the API? + r.logger = logger + } +} + +// PrintRecoveryStack is a functional option to enable +// or disable printing stack traces on panic. +func PrintRecoveryStack(shouldPrint bool) RecoveryOption { + return func(h http.Handler) { + r := h.(*recoveryHandler) //nolint:errcheck //TODO: + // @bharat-rajani should return type-assertion error but would break the API? + r.printStack = shouldPrint + } +} + +func (h recoveryHandler) ServeHTTP(w http.ResponseWriter, req *http.Request) { + defer func() { + if err := recover(); err != nil { + w.WriteHeader(http.StatusInternalServerError) + h.log(err) + } + }() + + h.handler.ServeHTTP(w, req) +} + +func (h recoveryHandler) log(v ...interface{}) { + if h.logger != nil { + h.logger.Println(v...) + } else { + log.Println(v...) + } + + if h.printStack { + stack := string(debug.Stack()) + if h.logger != nil { + h.logger.Println(stack) + } else { + log.Println(stack) + } + } +} |
