From 795397aa82f44755f2d01ece18ec057e2836b7fd Mon Sep 17 00:00:00 2001
From: wgroeneveld <wouter@brainbaking.com>
Date: Wed, 7 Apr 2021 11:29:21 +0200
Subject: [PATCH] trying to come up with a good go pkg structure

---
 app/index/handler.go      | 13 +++++++------
 app/routes.go             |  6 +++++-
 app/server.go             | 24 +++++++++++++++++++++---
 app/webmention/handler.go | 14 ++++++++++++++
 common/config.go          | 36 ++++++++++++++++++++++++++++++++++++
 5 files changed, 83 insertions(+), 10 deletions(-)
 create mode 100644 app/webmention/handler.go
 create mode 100644 common/config.go

diff --git a/app/index/handler.go b/app/index/handler.go
index 9c55d55..83e13bd 100644
--- a/app/index/handler.go
+++ b/app/index/handler.go
@@ -4,13 +4,14 @@ package index
 import (
 	"net/http"
 	"fmt"
+
+	"github.com/wgroeneveld/go-jamming/common"
 )
 
-func HandleIndex(w http.ResponseWriter, r *http.Request) {
-    w.WriteHeader(http.StatusOK)
-    fmt.Printf("testje")
+func Handle(conf *common.Config) http.HandlerFunc {
+    return func(w http.ResponseWriter, r *http.Request) {
+	    w.WriteHeader(http.StatusOK)
+	    fmt.Printf("testje")
+    }
 }
 
-//func (s *server) handleIndex() http.HandlerFunc {
-
-//}
diff --git a/app/routes.go b/app/routes.go
index 014b6b6..f743122 100644
--- a/app/routes.go
+++ b/app/routes.go
@@ -3,8 +3,12 @@ package app
 
 import (
 	"github.com/wgroeneveld/go-jamming/app/index"
+	"github.com/wgroeneveld/go-jamming/app/webmention"
 )
 
+// stole bits from https://pace.dev/blog/2018/05/09/how-I-write-http-services-after-eight-years.html
+// not that contempt with passing conf, but can't create receivers on non-local types, and won't move specifics into package app
 func (s *server) routes() {
-	s.router.HandleFunc("/", index.HandleIndex)
+	s.router.HandleFunc("/", index.Handle(s.conf))
+	s.router.HandleFunc("/webmention/{domain}/{token}", s.authorizedOnly(webmention.Handle(s.conf)))
 }
diff --git a/app/server.go b/app/server.go
index c899c43..68e3124 100644
--- a/app/server.go
+++ b/app/server.go
@@ -3,22 +3,40 @@ package app
 
 import (
 	"fmt"
+    "strconv"
 	"net/http"
 
 	"github.com/gorilla/mux"
+
+    "github.com/wgroeneveld/go-jamming/common"
 )
 
 type server struct {
 	router *mux.Router
+    conf *common.Config
+}
+
+// mimicing NotFound: https://golang.org/src/net/http/server.go?s=64787:64830#L2076
+func unauthorized(w http.ResponseWriter, r *http.Request) { http.Error(w, "401 unauthorized", http.StatusUnauthorized) }	
+
+func (s *server) authorizedOnly(h http.HandlerFunc) http.HandlerFunc {
+    return func(w http.ResponseWriter, r *http.Request) {
+	    vars := mux.Vars(r)
+	    if vars["token"] != s.conf.Token {
+        	unauthorized(w, r)
+        	return
+	    }
+		h(w, r)
+	}
 }
 
 func Start() {
     r := mux.NewRouter()
-    server := &server{router: r}
+    server := &server{router: r, conf: common.Configure()}
 
     server.routes()
     http.Handle("/", r)
 
-    fmt.Printf("Serving at port 1337...\n")
-    http.ListenAndServe(":1337", nil)
+    fmt.Printf("Serving at port %d...\n", server.conf.Port)
+    http.ListenAndServe(":" + strconv.Itoa(server.conf.Port), nil)
 }
diff --git a/app/webmention/handler.go b/app/webmention/handler.go
new file mode 100644
index 0000000..7afb38b
--- /dev/null
+++ b/app/webmention/handler.go
@@ -0,0 +1,14 @@
+
+package webmention
+
+import (
+	"net/http"
+
+	"github.com/wgroeneveld/go-jamming/common"
+)
+
+func Handle(conf *common.Config) http.HandlerFunc {
+    return func(w http.ResponseWriter, r *http.Request) {
+    }
+}
+
diff --git a/common/config.go b/common/config.go
new file mode 100644
index 0000000..d4e446e
--- /dev/null
+++ b/common/config.go
@@ -0,0 +1,36 @@
+
+package common
+
+import (
+	"os"
+	"strconv"
+)
+
+type Config struct {
+	Port int
+	Token string
+	UtcOffset int
+	AllowedWebmentionSources []string
+	DisallowedWebmentionDomains []string
+}
+
+func Configure() (c *Config) {
+	portstr := os.Getenv("PORT")
+    port, err := strconv.Atoi(portstr)
+    if err != nil {
+		port = 1337
+	}
+	token := os.Getenv("TOKEN")
+	if token == "" {
+		token = "miauwkes"
+	}
+
+	c = &Config{
+		Port: port,
+		Token: token,
+		UtcOffset: 60,
+		AllowedWebmentionSources: []string{ "brainbaking.com", "jefklakscodex.com" },
+		DisallowedWebmentionDomains: []string{ "youtube.com" },
+	}
+	return
+}