1 files changed, 240 insertions, 0 deletions
diff --git a/plugins/http/handler.go b/plugins/http/handler.go
new file mode 100644
index 00000000..1889ed6d
--- /dev/null
+++ b/plugins/http/handler.go
@@ -0,0 +1,240 @@
+package http
+
+import (
+	"net"
+	"net/http"
+	"strconv"
+	"strings"
+	"sync"
+	"time"
+
+	"github.com/hashicorp/go-multierror"
+	"github.com/spiral/errors"
+	"github.com/spiral/roadrunner/v2/interfaces/events"
+	"github.com/spiral/roadrunner/v2/interfaces/pool"
+	"github.com/spiral/roadrunner/v2/plugins/logger"
+)
+
+const (
+	// EventResponse thrown after the request been processed. See ErrorEvent as payload.
+	EventResponse = iota + 500
+
+	// EventError thrown on any non job error provided by road runner server.
+	EventError
+)
+
+const MB = 1024 * 1024
+
+type Handle interface {
+	AddListener(l events.EventListener)
+	ServeHTTP(w http.ResponseWriter, r *http.Request)
+}
+
+// ErrorEvent represents singular http error event.
+type ErrorEvent struct {
+	// Request contains client request, must not be stored.
+	Request *http.Request
+
+	// Error - associated error, if any.
+	Error error
+
+	// event timings
+	start   time.Time
+	elapsed time.Duration
+}
+
+// Elapsed returns duration of the invocation.
+func (e *ErrorEvent) Elapsed() time.Duration {
+	return e.elapsed
+}
+
+// ResponseEvent represents singular http response event.
+type ResponseEvent struct {
+	// Request contains client request, must not be stored.
+	Request *Request
+
+	// Response contains service response.
+	Response *Response
+
+	// event timings
+	start   time.Time
+	elapsed time.Duration
+}
+
+// Elapsed returns duration of the invocation.
+func (e *ResponseEvent) Elapsed() time.Duration {
+	return e.elapsed
+}
+
+// Handler serves http connections to underlying PHP application using PSR-7 protocol. Context will include request headers,
+// parsed files and query, payload will include parsed form dataTree (if any).
+type handler struct {
+	maxRequestSize uint64
+	uploads        UploadsConfig
+	trusted        Cidrs
+	log            logger.Logger
+	pool           pool.Pool
+	mul            sync.Mutex
+	lsn            events.EventListener
+}
+
+func NewHandler(maxReqSize uint64, uploads UploadsConfig, trusted Cidrs, pool pool.Pool) (Handle, error) {
+	if pool == nil {
+		return nil, errors.E(errors.Str("pool should be initialized"))
+	}
+	return &handler{
+		maxRequestSize: maxReqSize * MB,
+		uploads:        uploads,
+		pool:           pool,
+		trusted:        trusted,
+	}, nil
+}
+
+// Listen attaches handler event controller.
+func (h *handler) AddListener(l events.EventListener) {
+	h.mul.Lock()
+	defer h.mul.Unlock()
+
+	h.lsn = l
+}
+
+// mdwr serve using PSR-7 requests passed to underlying application. Attempts to serve static files first if enabled.
+func (h *handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	const op = errors.Op("ServeHTTP")
+	start := time.Now()
+
+	// validating request size
+	if h.maxRequestSize != 0 {
+		err := h.maxSize(w, r, start, op)
+		if err != nil {
+			return
+		}
+	}
+
+	req, err := NewRequest(r, h.uploads)
+	if err != nil {
+		h.handleError(w, r, err, start)
+		return
+	}
+
+	// proxy IP resolution
+	h.resolveIP(req)
+
+	req.Open(h.log)
+	defer req.Close(h.log)
+
+	p, err := req.Payload()
+	if err != nil {
+		h.handleError(w, r, err, start)
+		return
+	}
+
+	rsp, err := h.pool.Exec(p)
+	if err != nil {
+		h.handleError(w, r, err, start)
+		return
+	}
+
+	resp, err := NewResponse(rsp)
+	if err != nil {
+		h.handleError(w, r, err, start)
+		return
+	}
+
+	h.handleResponse(req, resp, start)
+	err = resp.Write(w)
+	if err != nil {
+		h.handleError(w, r, err, start)
+	}
+}
+
+func (h *handler) maxSize(w http.ResponseWriter, r *http.Request, start time.Time, op errors.Op) error {
+	if length := r.Header.Get("content-length"); length != "" {
+		if size, err := strconv.ParseInt(length, 10, 64); err != nil {
+			h.handleError(w, r, err, start)
+			return err
+		} else if size > int64(h.maxRequestSize) {
+			h.handleError(w, r, errors.E(op, errors.Str("request body max size is exceeded")), start)
+			return err
+		}
+	}
+	return nil
+}
+
+// handleError sends error.
+func (h *handler) handleError(w http.ResponseWriter, r *http.Request, err error, start time.Time) {
+	h.mul.Lock()
+	defer h.mul.Unlock()
+	// if pipe is broken, there is no sense to write the header
+	// in this case we just report about error
+	if err == errEPIPE {
+		h.throw(ErrorEvent{Request: r, Error: err, start: start, elapsed: time.Since(start)})
+		return
+	}
+	err = multierror.Append(err)
+	// ResponseWriter is ok, write the error code
+	w.WriteHeader(500)
+	_, err2 := w.Write([]byte(err.Error()))
+	// error during the writing to the ResponseWriter
+	if err2 != nil {
+		err = multierror.Append(err2, err)
+		// concat original error with ResponseWriter error
+		h.throw(ErrorEvent{Request: r, Error: errors.E(err), start: start, elapsed: time.Since(start)})
+		return
+	}
+	h.throw(ErrorEvent{Request: r, Error: err, start: start, elapsed: time.Since(start)})
+}
+
+// handleResponse triggers response event.
+func (h *handler) handleResponse(req *Request, resp *Response, start time.Time) {
+	h.throw(ResponseEvent{Request: req, Response: resp, start: start, elapsed: time.Since(start)})
+}
+
+// throw invokes event handler if any.
+func (h *handler) throw(event interface{}) {
+	if h.lsn != nil {
+		h.lsn(event)
+	}
+}
+
+// get real ip passing multiple proxy
+func (h *handler) resolveIP(r *Request) {
+	if h.trusted.IsTrusted(r.RemoteAddr) == false {
+		return
+	}
+
+	if r.Header.Get("X-Forwarded-For") != "" {
+		ips := strings.Split(r.Header.Get("X-Forwarded-For"), ",")
+		ipCount := len(ips)
+
+		for i := ipCount - 1; i >= 0; i-- {
+			addr := strings.TrimSpace(ips[i])
+			if net.ParseIP(addr) != nil {
+				r.RemoteAddr = addr
+				return
+			}
+		}
+
+		return
+	}
+
+	// The logic here is the following:
+	// In general case, we only expect X-Real-Ip header. If it exist, we get the IP address from header and set request Remote address
+	// But, if there is no X-Real-Ip header, we also trying to check CloudFlare headers
+	// True-Client-IP is a general CF header in which copied information from X-Real-Ip in CF.
+	// CF-Connecting-IP is an Enterprise feature and we check it last in order.
+	// This operations are near O(1) because Headers struct are the map type -> type MIMEHeader map[string][]string
+	if r.Header.Get("X-Real-Ip") != "" {
+		r.RemoteAddr = fetchIP(r.Header.Get("X-Real-Ip"))
+		return
+	}
+
+	if r.Header.Get("True-Client-IP") != "" {
+		r.RemoteAddr = fetchIP(r.Header.Get("True-Client-IP"))
+		return
+	}
+
+	if r.Header.Get("CF-Connecting-IP") != "" {
+		r.RemoteAddr = fetchIP(r.Header.Get("CF-Connecting-IP"))
+	}
+}