From 03de6a9b1c376fe67a28a61392c81b428d4e8271 Mon Sep 17 00:00:00 2001
From: phriscage <phriscage@gmail.com>
Date: Sun, 2 Dec 2018 16:04:02 -0500
Subject: [PATCH] adding apigee clientID support

---
 src/frontend/handlers.go           | 62 ++++++++++++++++++++++++++++++
 src/frontend/main.go               | 16 +++++---
 src/frontend/templates/config.html | 36 +++++++++++++++++
 3 files changed, 108 insertions(+), 6 deletions(-)
 create mode 100644 src/frontend/templates/config.html

diff --git a/src/frontend/handlers.go b/src/frontend/handlers.go
index d7e8765..6a305c9 100644
--- a/src/frontend/handlers.go
+++ b/src/frontend/handlers.go
@@ -344,6 +344,60 @@ func (fe *frontendServer) setCurrencyHandler(w http.ResponseWriter, r *http.Requ
 	w.WriteHeader(http.StatusFound)
 }
 
+// viewConfigHandler adds an endpoint for administrators to add custom configuration items.
+// I.E. apigeeClientID
+// TODO(phriscage) update for multiple config values
+func (fe *frontendServer) viewConfigHandler(w http.ResponseWriter, r *http.Request) {
+	log := r.Context().Value(ctxKeyLog{}).(logrus.FieldLogger)
+	currencies, err := fe.getCurrencies(r.Context())
+	if err != nil {
+		renderHTTPError(log, r, w, errors.Wrap(err, "could not retrieve currencies"), http.StatusInternalServerError)
+		return
+	}
+
+	cart, err := fe.getCart(r.Context(), sessionID(r))
+	if err != nil {
+		renderHTTPError(log, r, w, errors.Wrap(err, "could not retrieve cart"), http.StatusInternalServerError)
+		return
+	}
+
+	apigeeClientID := currentApigeeClientID(r)
+
+	if err := templates.ExecuteTemplate(w, "config", map[string]interface{}{
+		"session_id":       sessionID(r),
+		"request_id":       r.Context().Value(ctxKeyRequestID{}),
+		"user_currency":    currentCurrency(r),
+		"currencies":       currencies,
+		"apigee_client_id": apigeeClientID,
+		"cart_size":        len(cart),
+	}); err != nil {
+		log.Println(err)
+	}
+}
+
+// setConfigHandler we set the config variables from the FORM POST.
+// Currently utilizing Cookies until appropriate storage library is determined
+func (fe *frontendServer) setConfigHandler(w http.ResponseWriter, r *http.Request) {
+	log := r.Context().Value(ctxKeyLog{}).(logrus.FieldLogger)
+	apigeeClientID := r.FormValue("apigee_client_id")
+	log.WithField("apigee_client_id.new", apigeeClientID).WithField("apigeeClientID.old", currentApigeeClientID(r)).
+		Debug("setting apigee_client_id")
+
+	if apigeeClientID != "" {
+		http.SetCookie(w, &http.Cookie{
+			Name:   apigeeClientIDHeaderName,
+			Value:  apigeeClientID,
+			MaxAge: cookieMaxAge,
+		})
+	}
+	referer := r.Header.Get("referer")
+	if referer == "" {
+		referer = "/"
+	}
+	w.Header().Set("Location", referer)
+	w.WriteHeader(http.StatusFound)
+}
+
 // chooseAd queries for advertisements available and randomly chooses one, if
 // available. It ignores the error retrieving the ad since it is not critical.
 func (fe *frontendServer) chooseAd(ctx context.Context, ctxKeys []string, log logrus.FieldLogger) *pb.Ad {
@@ -376,6 +430,14 @@ func currentCurrency(r *http.Request) string {
 	return defaultCurrency
 }
 
+func currentApigeeClientID(r *http.Request) string {
+	c, _ := r.Cookie(apigeeClientIDHeaderName)
+	if c != nil {
+		return c.Value
+	}
+	return defaultApigeeClientID
+}
+
 func sessionID(r *http.Request) string {
 	v := r.Context().Value(ctxKeySessionID{})
 	if v != nil {
diff --git a/src/frontend/main.go b/src/frontend/main.go
index 5046432..d72788e 100644
--- a/src/frontend/main.go
+++ b/src/frontend/main.go
@@ -35,13 +35,15 @@ import (
 )
 
 const (
-	port            = "8080"
-	defaultCurrency = "USD"
-	cookieMaxAge    = 60 * 60 * 48
+	port                  = "8080"
+	defaultCurrency       = "USD"
+	cookieMaxAge          = 60 * 60 * 48
+	defaultApigeeClientID = "Add your Apigee Application Client ID here"
 
-	cookiePrefix    = "shop_"
-	cookieSessionID = cookiePrefix + "session-id"
-	cookieCurrency  = cookiePrefix + "currency"
+	cookiePrefix             = "shop_"
+	cookieSessionID          = cookiePrefix + "session-id"
+	cookieCurrency           = cookiePrefix + "currency"
+	apigeeClientIDHeaderName = "x-api-key"
 )
 
 var (
@@ -124,6 +126,8 @@ func main() {
 	r.HandleFunc("/cart", svc.viewCartHandler).Methods(http.MethodGet, http.MethodHead)
 	r.HandleFunc("/cart", svc.addToCartHandler).Methods(http.MethodPost)
 	r.HandleFunc("/cart/empty", svc.emptyCartHandler).Methods(http.MethodPost)
+	r.HandleFunc("/config", svc.viewConfigHandler).Methods(http.MethodGet, http.MethodHead)
+	r.HandleFunc("/config", svc.setConfigHandler).Methods(http.MethodPost)
 	r.HandleFunc("/setCurrency", svc.setCurrencyHandler).Methods(http.MethodPost)
 	r.HandleFunc("/logout", svc.logoutHandler).Methods(http.MethodGet)
 	r.HandleFunc("/cart/checkout", svc.placeOrderHandler).Methods(http.MethodPost)
diff --git a/src/frontend/templates/config.html b/src/frontend/templates/config.html
new file mode 100644
index 0000000..b9bff9c
--- /dev/null
+++ b/src/frontend/templates/config.html
@@ -0,0 +1,36 @@
+{{ define "config" }}
+    {{ template "header" . }}
+
+    <main role="main">
+        <div class="py-5">
+            <div class="container bg-light py-3 px-lg-5 py-lg-5">
+                <div class="row py-3 my-2">
+                    <div class="col-12 col-lg-8 offset-lg-2">
+                        <h2>Hipster App Configuration</h2>
+                        <hr/>
+                        <form action="/config" method="POST">
+                            <div class="form-row">
+                              <div class="col-lg-3 mb-3 text-center">Apigee Client ID:</div>
+                                <div class="col-lg-8 mb-3">
+                                    <input type="text" class="form-control" id="apigee_client_id" name="apigee_client_id" value="{{ .apigee_client_id }}" required>
+                                </div>
+                            </div>
+                          <hr/>
+                            <div class="form-row">
+                              	<div class="col">
+                                </div>
+                                <div class="col-lg-5 mb-3">
+                                	<button class="btn btn-primary btn-block" type="submit">Save</button>
+                              	</div>
+                                <div class="col">
+                                </div>
+                            </div>
+                         </form>
+                     </div>
+                 </div>
+            </div>
+        </div>
+    </main>
+
+    {{ template "footer" . }}
+{{ end }}