/
handlers.go
203 lines (173 loc) · 5.1 KB
/
handlers.go
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package main
import (
"encoding/json"
"fmt"
oauth2 "github.com/goincremental/negroni-oauth2"
"golang.org/x/net/context"
goauth2 "golang.org/x/oauth2"
"golang.org/x/oauth2/google"
gmail "google.golang.org/api/gmail/v1"
"io/ioutil"
"log"
"net/http"
"strings"
"time"
)
/**
* Presents the index page for users, which links to /login.
*/
func main_handler(w http.ResponseWriter, r *http.Request) {
// If logged in, forward along to the main app directly.
if UserLoggedIn(r) {
http.Redirect(w, r, "/app", 307)
// If not logged in, display the index page.
} else {
body, err := ioutil.ReadFile("web/index.html")
if err != nil {
log.Println("Couldn't find web/index.html")
fmt.Fprintf(w, "Couldn't find index.html")
} else {
fmt.Fprintf(w, string(body))
}
}
}
/**
* Receives the OAuth callback from Google, retrieves the one-time use authentication
* code that can be used to fetch tokens.
*
* TODO: Also needs to call Google data API to retrieve the user's email address, which
* we'll use to identify them (both internally and in the UI).
*/
func auth_handler(w http.ResponseWriter, r *http.Request) {
// requests for favicon.ico should be excluded
if r.URL.Path == "/favicon.ico" {
log.Println("favicon request doesn't count")
http.Error(w, "", 404)
return
}
// We want to get the authorization code. Check to see if its there.
user, err := FetchUser(r, w)
if err != nil {
log.Println("Couldn't retrieve user: " + err.Error())
// On success, redirect to the main app
} else {
StoreUserInSession(r, user)
http.Redirect(w, r, "/app", 307)
}
}
func fetch(w http.ResponseWriter, r *http.Request) {
query := r.FormValue("q")
tasks := make([]Item, 0)
if len(query) > 0 {
log.Println("Fetch request received. Query=" + query)
} else {
log.Println("Fetch request received. Query=<none>")
}
tokens := oauth2.GetToken(r)
// Retrieve the access token if it's available. If not then
// its an error.
if !UserLoggedIn(r) {
log.Println("ERR: no retrievable token for this user")
http.Error(w, "", 500)
} else {
service, err := getGmailService(tokens)
if err != nil {
http.Error(w, "", 500)
}
// Get labels and create a mapping between ID's and names. Note that a label
// on a message will be dropped unless it's mapping is available in this table.
labelTable := make(map[string]string)
labelReq := service.Users.Labels.List("me")
labelResponse, err := labelReq.Do()
if err != nil {
log.Println(err.Error())
}
for _, label := range labelResponse.Labels {
// Only keep user-defined labels. Gmail also creates some as well
// but users don't see them so it's going to look whacky / broken here.
if label.Type == "user" {
labelTable[label.Id] = label.Name
}
}
// Get messages
messageReq := new(gmail.UsersMessagesListCall)
if len(query) > 0 {
messageReq = service.Users.Messages.List("me").Q(query)
} else {
messageReq = service.Users.Messages.List("me")
}
messageResponse, err := messageReq.Do()
if err != nil {
log.Println(err.Error())
} else {
// TODO: if the query succeeded, save this as the user's filter.
}
log.Println(fmt.Sprintf("Retrieving %d messages...", len(messageResponse.Messages)))
for _, m := range messageResponse.Messages {
msg, err := service.Users.Messages.Get("me", m.Id).Do()
if err != nil {
log.Println(err.Error())
}
tasks = append(tasks, parseMessage(msg, labelTable))
}
}
data, err := json.Marshal(tasks)
if err != nil {
log.Println("Couldn't serialize item list: " + err.Error())
}
w.Header().Set("Content-Type", "application/json")
fmt.Fprintf(w, string(data))
}
func app_handler(w http.ResponseWriter, r *http.Request) {
body, err := ioutil.ReadFile("web/app.html")
if err != nil {
log.Println("Couldn't find web/app.html")
fmt.Fprintf(w, "Couldn't find web/app.html")
} else {
fmt.Fprintf(w, string(body))
}
}
func getGmailService(tokens oauth2.Tokens) (*gmail.Service, error) {
config := goauth2.Config{
ClientID: *CLIENT_ID,
ClientSecret: *SECRET,
Endpoint: google.Endpoint,
Scopes: []string{gmail.MailGoogleComScope},
RedirectURL: "http://localhost:8080/auth",
}
ctx := context.Background()
tok := (goauth2.Token)(tokens.Get())
client := config.Client(ctx, &tok)
return gmail.New(client)
}
func parseMessage(msg *gmail.Message, labelTable map[string]string) Item {
item := Item{
Snippet: msg.Snippet,
}
// Extract important headers that we want to send to the frontend.
for _, header := range msg.Payload.Headers {
if header.Name == "Subject" {
item.Title = header.Value
}
if header.Name == "From" {
item.RequestedFrom = header.Value
}
if header.Name == "Received" {
segments := strings.Split(header.Value, ";")
date, err := time.Parse("Mon, 2 Jan 2006 15:04:05 -0700 (MST)", strings.TrimSpace(segments[1]))
if err != nil {
log.Println("Unknown date string: " + segments[1])
} else {
item.CreationDate = date
}
}
}
labels := make([]string, 0)
for _, label := range msg.LabelIds {
if named, ok := labelTable[label]; ok {
labels = append(labels, named)
}
}
item.Labels = labels
return item
}