Send single email button.

TODO

@@ -1,6 +1,6 @@
 TODO
 - Break up indexHandler
-- Single email sending button
+- Flash message when sending a single email
 - Loop over registered accounts and send them email
 - Flash message and sign out when OAuth token has expired/is invalid
 - Handle pagination for user repository list

app/githop.go

@@ -1,6 +1,7 @@
 package githop
 
 import (
+	"bytes"
 	"encoding/json"
 	"html/template"
 	"io/ioutil"
@@ -8,6 +9,7 @@ import (
 	"net/http"
 
 	"appengine"
+	"appengine/mail"
 	"appengine/urlfetch"
 
 	"code.google.com/p/goauth2/oauth"
@@ -35,7 +37,7 @@ func initGithubOAuthConfig() {
 	if err != nil {
 		log.Panicf("Could not parse GitHub OAuth config %s: %s", configBytes, err.Error())
 	}
-	githubOauthConfig.Scope = "repo"
+	githubOauthConfig.Scope = "repo, user:email"
 	githubOauthConfig.AuthURL = "https://github.com/login/oauth/authorize"
 	githubOauthConfig.TokenURL = "https://github.com/login/oauth/access_token"
 }
@@ -46,6 +48,7 @@ func init() {
 
 	router = mux.NewRouter()
 	router.HandleFunc("/", indexHandler).Name("index")
+	router.HandleFunc("/digest/send", sendDigestHandler).Name("send-digest").Methods("POST")
 	router.HandleFunc("/session/sign-in", signInHandler).Name("sign-in")
 	router.HandleFunc("/session/sign-out", signOutHandler).Name("sign-out")
 	router.HandleFunc("/github/callback", githubOAuthCallbackHandler)
@@ -100,15 +103,76 @@ func indexHandler(w http.ResponseWriter, r *http.Request) {
 		http.Error(w, err.Error(), http.StatusInternalServerError)
 	}
 	signOutUrl, _ := router.Get("sign-out").URL()
+	sendDigestUrl, _ := router.Get("send-digest").URL()
 	var data = map[string]interface{}{
-		"SignOutUrl": signOutUrl.String(),
+		"SignOutUrl":    signOutUrl.String(),
-		"Digest":     digest,
+		"SendDigestUrl": sendDigestUrl.String(),
+		"Digest":        digest,
 	}
 	if err := templates.ExecuteTemplate(w, "index", data); err != nil {
 		http.Error(w, err.Error(), http.StatusInternalServerError)
 	}
 }
 
+func sendDigestHandler(w http.ResponseWriter, r *http.Request) {
+	session, _ := sessionStore.Get(r, sessionConfig.CookieName)
+	userId := session.Values[sessionConfig.UserIdKey].(int)
+	c := appengine.NewContext(r)
+	account, err := getAccount(c, userId)
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+
+	oauthTransport := githubOAuthTransport(r)
+	oauthTransport.Token = &account.OAuthToken
+	githubClient := github.NewClient(oauthTransport.Client())
+
+	digest, err := newDigest(githubClient)
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+
+	var digestHtml bytes.Buffer
+	if err := templates.ExecuteTemplate(&digestHtml, "digest", digest); err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+
+	emails, _, err := githubClient.Users.ListEmails(nil)
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+	var primaryVerified *string
+	for _, email := range emails {
+		if email.Primary != nil && *email.Primary &&
+			email.Verified != nil && *email.Verified {
+			primaryVerified = email.Email
+			break
+		}
+	}
+	if primaryVerified == nil {
+		http.Error(w, "No verified email addresses found in GitHub account", http.StatusBadRequest)
+		return
+	}
+
+	digestMessage := &mail.Message{
+		Sender:   "GitHop <mihai.parparita@gmail.com>",
+		To:       []string{*primaryVerified},
+		Subject:  "GitHop Digest",
+		HTMLBody: digestHtml.String(),
+	}
+	if err := mail.Send(c, digestMessage); err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+
+	indexUrl, _ := router.Get("index").URL()
+	http.Redirect(w, r, indexUrl.String(), http.StatusFound)
+}
+
 func githubOAuthCallbackHandler(w http.ResponseWriter, r *http.Request) {
 	code := r.FormValue("code")
 	oauthTransport := githubOAuthTransport(r)

app/templates/index.html

@@ -16,6 +16,10 @@
     </a>
   </p>
 
+  <form method="POST" action="{{.SendDigestUrl}}">
+    <input type="submit" value="Email Digest">
+  </form>
+
   {{template "digest" .Digest}}
 </body>
 </html>