From 859b5d7ea3b8f660ac68d9aea5a53d25a9a7422c Mon Sep 17 00:00:00 2001
From: Matthew Holt <mholt@users.noreply.github.com>
Date: Tue, 26 Mar 2019 12:00:54 -0600
Subject: Initial commit

---
 admin.go | 130 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 130 insertions(+)
 create mode 100644 admin.go

(limited to 'admin.go')

diff --git a/admin.go b/admin.go
new file mode 100644
index 0000000..0672745
--- /dev/null
+++ b/admin.go
@@ -0,0 +1,130 @@
+package caddy2
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"io"
+	"log"
+	"net"
+	"net/http"
+	"strings"
+	"sync"
+)
+
+var (
+	cfgEndptSrv   *http.Server
+	cfgEndptSrvMu sync.Mutex
+)
+
+// Start starts Caddy's administration endpoint.
+func Start(addr string) error {
+	cfgEndptSrvMu.Lock()
+	defer cfgEndptSrvMu.Unlock()
+
+	ln, err := net.Listen("tcp", addr)
+	if err != nil {
+		return err
+	}
+
+	mux := http.NewServeMux()
+	mux.HandleFunc("/load", handleLoadConfig)
+
+	for _, m := range GetModules("admin") {
+		moduleValue, err := m.New()
+		if err != nil {
+			return fmt.Errorf("initializing module '%s': %v", m.Name, err)
+		}
+		route := moduleValue.(AdminRoute)
+		mux.Handle(route.Pattern, route)
+	}
+
+	cfgEndptSrv = &http.Server{
+		Handler: mux,
+	}
+
+	go cfgEndptSrv.Serve(ln)
+
+	return nil
+}
+
+// AdminRoute represents a route for the admin endpoint.
+type AdminRoute struct {
+	http.Handler
+	Pattern string
+}
+
+// Stop stops the API endpoint.
+func Stop() error {
+	cfgEndptSrvMu.Lock()
+	defer cfgEndptSrvMu.Unlock()
+
+	if cfgEndptSrv == nil {
+		return fmt.Errorf("no server")
+	}
+
+	err := cfgEndptSrv.Shutdown(context.Background()) // TODO
+	if err != nil {
+		return fmt.Errorf("shutting down server: %v", err)
+	}
+
+	cfgEndptSrv = nil
+
+	return nil
+}
+
+func handleLoadConfig(w http.ResponseWriter, r *http.Request) {
+	if r.Method != "POST" {
+		http.Error(w, http.StatusText(http.StatusMethodNotAllowed), http.StatusMethodNotAllowed)
+		return
+	}
+
+	if !strings.Contains(r.Header.Get("Content-Type"), "/json") {
+		http.Error(w, "unacceptable Content-Type", http.StatusBadRequest)
+		return
+	}
+
+	err := Load(r.Body)
+	if err != nil {
+		log.Printf("[ADMIN][ERROR] loading config: %v", err)
+		http.Error(w, err.Error(), http.StatusBadRequest)
+		return
+	}
+}
+
+// Load loads a configuration.
+func Load(r io.Reader) error {
+	gc := globalConfig{modules: make(map[string]interface{})}
+	err := json.NewDecoder(r).Decode(&gc)
+	if err != nil {
+		return fmt.Errorf("decoding config: %v", err)
+	}
+
+	for modName, rawMsg := range gc.Modules {
+		mod, ok := modules[modName]
+		if !ok {
+			return fmt.Errorf("unrecognized module: %s", modName)
+		}
+
+		if mod.New != nil {
+			val, err := mod.New()
+			if err != nil {
+				return fmt.Errorf("initializing module '%s': %v", modName, err)
+			}
+			err = json.Unmarshal(rawMsg, &val)
+			if err != nil {
+				return fmt.Errorf("decoding module config: %s: %v", modName, err)
+			}
+			gc.modules[modName] = val
+		}
+	}
+
+	return nil
+}
+
+type globalConfig struct {
+	TestVal string                     `json:"testval"`
+	Modules map[string]json.RawMessage `json:"modules"`
+	TestArr []string                   `json:"test_arr"`
+	modules map[string]interface{}
+}
-- 
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