From fec7fa8bfda713e8042b9bbf9a480c7792b78c41 Mon Sep 17 00:00:00 2001
From: Matthew Holt <mholt@users.noreply.github.com>
Date: Mon, 20 May 2019 10:59:20 -0600
Subject: Implement most of static file server; refactor and improve Replacer

---
 modules/caddyhttp/server.go | 91 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 91 insertions(+)
 create mode 100644 modules/caddyhttp/server.go

(limited to 'modules/caddyhttp/server.go')

diff --git a/modules/caddyhttp/server.go b/modules/caddyhttp/server.go
new file mode 100644
index 0000000..5ab7693
--- /dev/null
+++ b/modules/caddyhttp/server.go
@@ -0,0 +1,91 @@
+package caddyhttp
+
+import (
+	"context"
+	"fmt"
+	"log"
+	"net/http"
+
+	"bitbucket.org/lightcodelabs/caddy2"
+	"bitbucket.org/lightcodelabs/caddy2/modules/caddytls"
+)
+
+// Server is an HTTP server.
+type Server struct {
+	Listen                []string                    `json:"listen"`
+	ReadTimeout           caddy2.Duration             `json:"read_timeout"`
+	ReadHeaderTimeout     caddy2.Duration             `json:"read_header_timeout"`
+	Routes                RouteList                   `json:"routes"`
+	Errors                httpErrorConfig             `json:"errors"`
+	TLSConnPolicies       caddytls.ConnectionPolicies `json:"tls_connection_policies"`
+	DisableAutoHTTPS      bool                        `json:"disable_auto_https"`
+	DisableAutoHTTPSRedir bool                        `json:"disable_auto_https_redir"`
+	MaxRehandles          int                         `json:"max_rehandles"`
+
+	tlsApp *caddytls.TLS
+}
+
+// ServeHTTP is the entry point for all HTTP requests.
+func (s *Server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	if s.tlsApp.HandleHTTPChallenge(w, r) {
+		return
+	}
+
+	// set up the replacer
+	repl := newReplacer(r, w)
+	ctx := context.WithValue(r.Context(), caddy2.ReplacerCtxKey, repl)
+	ctx = context.WithValue(ctx, TableCtxKey, make(map[string]interface{})) // TODO: Implement this
+	r = r.WithContext(ctx)
+
+	// build and execute the main handler chain
+	stack := s.Routes.BuildCompositeRoute(w, r)
+	err := s.executeCompositeRoute(w, r, stack)
+	if err != nil {
+		// add the error value to the request context so
+		// it can be accessed by error handlers
+		c := context.WithValue(r.Context(), ErrorCtxKey, err)
+		r = r.WithContext(c)
+		// TODO: add error values to Replacer
+
+		if len(s.Errors.Routes) == 0 {
+			// TODO: implement a default error handler?
+			log.Printf("[ERROR] %s", err)
+		} else {
+			errStack := s.Errors.Routes.BuildCompositeRoute(w, r)
+			err := s.executeCompositeRoute(w, r, errStack)
+			if err != nil {
+				// TODO: what should we do if the error handler has an error?
+				log.Printf("[ERROR] handling error: %v", err)
+			}
+		}
+	}
+}
+
+// executeCompositeRoute executes stack with w and r. This function handles
+// the special ErrRehandle error value, which reprocesses requests through
+// the stack again. Any error value returned from this function would be an
+// actual error that needs to be handled.
+func (s *Server) executeCompositeRoute(w http.ResponseWriter, r *http.Request, stack Handler) error {
+	var err error
+	for i := -1; i <= s.MaxRehandles; i++ {
+		// we started the counter at -1 because we
+		// always want to run this at least once
+		err = stack.ServeHTTP(w, r)
+		if err != ErrRehandle {
+			break
+		}
+		if i >= s.MaxRehandles-1 {
+			return fmt.Errorf("too many rehandles")
+		}
+	}
+	return err
+}
+
+type httpErrorConfig struct {
+	Routes RouteList `json:"routes"`
+	// TODO: some way to configure the logging of errors, probably? standardize
+	// the logging configuration first.
+}
+
+// TableCtxKey is the context key for the request's variable table.
+const TableCtxKey caddy2.CtxKey = "table"
-- 
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