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248 lines
7.2 KiB
Go
248 lines
7.2 KiB
Go
// Package fastcgi has middleware that acts as a FastCGI client. Requests
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// that get forwarded to FastCGI stop the middleware execution chain.
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// The most common use for this package is to serve PHP websites via php-fpm.
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package fastcgi
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import (
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"io"
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"net/http"
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"os"
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"path/filepath"
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"strconv"
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"strings"
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"github.com/mholt/caddy/middleware"
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)
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// Handler is a middleware type that can handle requests as a FastCGI client.
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type Handler struct {
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Next middleware.Handler
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Rules []Rule
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Root string
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AbsRoot string // same as root, but absolute path
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FileSys http.FileSystem
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// These are sent to CGI scripts in env variables
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SoftwareName string
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SoftwareVersion string
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ServerName string
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ServerPort string
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}
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// ServeHTTP satisfies the middleware.Handler interface.
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func (h Handler) ServeHTTP(w http.ResponseWriter, r *http.Request) (int, error) {
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for _, rule := range h.Rules {
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// First requirement: Base path must match
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if !middleware.Path(r.URL.Path).Matches(rule.Path) {
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continue
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}
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// In addition to matching the path, a request must meet some
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// other criteria before being proxied as FastCGI. For example,
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// we probably want to exclude static assets (CSS, JS, images...)
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// but we also want to be flexible for the script we proxy to.
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fpath := r.URL.Path
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if idx, ok := middleware.IndexFile(h.FileSys, fpath, rule.IndexFiles); ok {
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fpath = idx
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}
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// These criteria work well in this order for PHP sites
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if fpath[len(fpath)-1] == '/' || strings.HasSuffix(fpath, rule.Ext) || !h.exists(fpath) {
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// Create environment for CGI script
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env, err := h.buildEnv(r, rule, fpath)
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if err != nil {
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return http.StatusInternalServerError, err
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}
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// Connect to FastCGI gateway
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var fcgi *FCGIClient
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// check if unix socket or tcp
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if strings.HasPrefix(rule.Address, "/") || strings.HasPrefix(rule.Address, "unix:") {
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if strings.HasPrefix(rule.Address, "unix:") {
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rule.Address = rule.Address[len("unix:"):]
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}
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fcgi, err = Dial("unix", rule.Address)
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} else {
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fcgi, err = Dial("tcp", rule.Address)
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}
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if err != nil {
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return http.StatusBadGateway, err
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}
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var resp *http.Response
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contentLength, _ := strconv.Atoi(r.Header.Get("Content-Length"))
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switch r.Method {
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case "HEAD":
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resp, err = fcgi.Head(env)
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case "GET":
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resp, err = fcgi.Get(env)
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case "OPTIONS":
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resp, err = fcgi.Options(env)
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case "POST":
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resp, err = fcgi.Post(env, r.Header.Get("Content-Type"), r.Body, contentLength)
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case "PUT":
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resp, err = fcgi.Put(env, r.Header.Get("Content-Type"), r.Body, contentLength)
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case "PATCH":
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resp, err = fcgi.Patch(env, r.Header.Get("Content-Type"), r.Body, contentLength)
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case "DELETE":
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resp, err = fcgi.Delete(env, r.Header.Get("Content-Type"), r.Body, contentLength)
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default:
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return http.StatusMethodNotAllowed, nil
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}
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if resp.Body != nil {
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defer resp.Body.Close()
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}
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if err != nil && err != io.EOF {
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return http.StatusBadGateway, err
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}
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// Write the response header
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for key, vals := range resp.Header {
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for _, val := range vals {
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w.Header().Add(key, val)
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}
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}
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w.WriteHeader(resp.StatusCode)
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// Write the response body
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// TODO: If this has an error, the response will already be
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// partly written. We should copy out of resp.Body into a buffer
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// first, then write it to the response...
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_, err = io.Copy(w, resp.Body)
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if err != nil {
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return http.StatusBadGateway, err
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}
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return 0, nil
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}
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}
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return h.Next.ServeHTTP(w, r)
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}
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func (h Handler) exists(path string) bool {
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if _, err := os.Stat(h.Root + path); err == nil {
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return true
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}
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return false
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}
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// buildEnv returns a set of CGI environment variables for the request.
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func (h Handler) buildEnv(r *http.Request, rule Rule, fpath string) (map[string]string, error) {
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var env map[string]string
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// Get absolute path of requested resource
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absPath := filepath.Join(h.AbsRoot, fpath)
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// Separate remote IP and port; more lenient than net.SplitHostPort
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var ip, port string
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if idx := strings.Index(r.RemoteAddr, ":"); idx > -1 {
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ip = r.RemoteAddr[:idx]
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port = r.RemoteAddr[idx+1:]
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} else {
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ip = r.RemoteAddr
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}
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// Split path in preparation for env variables
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splitPos := strings.Index(fpath, rule.SplitPath)
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var docURI, scriptName, scriptFilename, pathInfo string
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if splitPos == -1 {
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// Request doesn't have the extension, so assume index file in root
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docURI = "/" + rule.IndexFiles[0]
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scriptName = "/" + rule.IndexFiles[0]
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scriptFilename = filepath.Join(h.AbsRoot, rule.IndexFiles[0])
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pathInfo = fpath
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} else {
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// Request has the extension; path was split successfully
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docURI = fpath[:splitPos+len(rule.SplitPath)]
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pathInfo = fpath[splitPos+len(rule.SplitPath):]
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scriptName = fpath
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scriptFilename = absPath
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}
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// Some variables are unused but cleared explicitly to prevent
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// the parent environment from interfering.
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env = map[string]string{
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// Variables defined in CGI 1.1 spec
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"AUTH_TYPE": "", // Not used
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"CONTENT_LENGTH": r.Header.Get("Content-Length"),
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"CONTENT_TYPE": r.Header.Get("Content-Type"),
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"GATEWAY_INTERFACE": "CGI/1.1",
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"PATH_INFO": pathInfo,
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"QUERY_STRING": r.URL.RawQuery,
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"REMOTE_ADDR": ip,
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"REMOTE_HOST": ip, // For speed, remote host lookups disabled
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"REMOTE_PORT": port,
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"REMOTE_IDENT": "", // Not used
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"REMOTE_USER": "", // Not used
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"REQUEST_METHOD": r.Method,
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"SERVER_NAME": h.ServerName,
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"SERVER_PORT": h.ServerPort,
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"SERVER_PROTOCOL": r.Proto,
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"SERVER_SOFTWARE": h.SoftwareName + "/" + h.SoftwareVersion,
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// Other variables
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"DOCUMENT_ROOT": h.AbsRoot,
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"DOCUMENT_URI": docURI,
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"HTTP_HOST": r.Host, // added here, since not always part of headers
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"REQUEST_URI": r.URL.RequestURI(),
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"SCRIPT_FILENAME": scriptFilename,
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"SCRIPT_NAME": scriptName,
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}
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// compliance with the CGI specification that PATH_TRANSLATED
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// should only exist if PATH_INFO is defined.
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// Info: https://www.ietf.org/rfc/rfc3875 Page 14
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if env["PATH_INFO"] != "" {
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env["PATH_TRANSLATED"] = filepath.Join(h.AbsRoot, pathInfo) // Info: http://www.oreilly.com/openbook/cgi/ch02_04.html
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}
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// Add env variables from config
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for _, envVar := range rule.EnvVars {
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env[envVar[0]] = envVar[1]
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}
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// Add all HTTP headers to env variables
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for field, val := range r.Header {
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header := strings.ToUpper(field)
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header = headerNameReplacer.Replace(header)
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env["HTTP_"+header] = strings.Join(val, ", ")
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}
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return env, nil
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}
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// Rule represents a FastCGI handling rule.
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type Rule struct {
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// The base path to match. Required.
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Path string
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// The address of the FastCGI server. Required.
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Address string
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// Always process files with this extension with fastcgi.
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Ext string
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// The path in the URL will be split into two, with the first piece ending
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// with the value of SplitPath. The first piece will be assumed as the
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// actual resource (CGI script) name, and the second piece will be set to
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// PATH_INFO for the CGI script to use.
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SplitPath string
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// If the URL ends with '/' (which indicates a directory), these index
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// files will be tried instead.
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IndexFiles []string
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// Environment Variables
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EnvVars [][2]string
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}
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var headerNameReplacer = strings.NewReplacer(" ", "_", "-", "_")
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