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server: initial implementation, multitenant auth + label fetch
Signed-off-by: Alexander Bezzubov <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,110 @@ | ||
| package main | ||
|
|
||
| import ( | ||
| "log" | ||
| "net/http" | ||
| "os" | ||
|
|
||
| "github.com/bzz/scholar-alert-digest/gmailutils" | ||
| "github.com/bzz/scholar-alert-digest/gmailutils/token" | ||
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| "golang.org/x/oauth2" | ||
| "golang.org/x/oauth2/google" | ||
| "google.golang.org/api/gmail/v1" | ||
| ) | ||
|
|
||
| var ( | ||
| addr = "localhost:8080" | ||
| oauthCfg = &oauth2.Config{ | ||
| // from https://console.developers.google.com/project/<your-project-id>/apiui/credential | ||
| ClientID: os.Getenv("SAL_GOOGLE_ID"), | ||
| ClientSecret: os.Getenv("SAL_GOOGLE_SECRET"), | ||
| RedirectURL: "http://localhost:8080/login/authorized", | ||
| Endpoint: google.Endpoint, | ||
| Scopes: []string{gmail.GmailReadonlyScope}, | ||
| } | ||
| ) | ||
|
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| func main() { | ||
| // TODO(bzz): | ||
| // - configure the log level, to include requests in debug | ||
| // - add default req timeouts + throttling, to prevent abuse | ||
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| log.Printf("starting the web server at http://%s", addr) | ||
| defer log.Printf("stoping the web server") | ||
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| mux := http.NewServeMux() | ||
| mux.HandleFunc("/", handleRoot) | ||
| mux.HandleFunc("/login", handleLogin) | ||
| mux.HandleFunc("/login/authorized", handleAuth) | ||
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| http.ListenAndServe(addr, sessionMiddleware(mux)) | ||
| } | ||
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| func handleRoot(w http.ResponseWriter, r *http.Request) { | ||
| // get token, stored in context by middleware (from cookies) | ||
| tok, authorized := token.FromContext(r.Context()) | ||
| if !authorized { // TODO(bzz): move this to middleware | ||
| w.WriteHeader(http.StatusNotFound) | ||
| w.Write([]byte("Not logged in: go to /login\n")) | ||
| } | ||
|
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| // TOOD(bzz): if the label is known, fetch messages instead | ||
| // gmailutils.Fetch(srv, "me", fmt.Sprintf("label:%s is:unread", gmailLabel)) | ||
| labels, err := gmailutils.FetchLabels(r.Context(), oauthCfg, tok) | ||
| if err != nil { | ||
| log.Printf("Unable to retrieve all labels: %v", err) | ||
| w.WriteHeader(http.StatusBadRequest) | ||
| return | ||
| } | ||
|
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| // TODO: render a template \w POST form to label selection | ||
| data, err := labels.MarshalJSON() | ||
| if err != nil { | ||
| log.Printf("Failed to encode labels in JSON: %v", err) | ||
| w.WriteHeader(http.StatusBadRequest) | ||
| return | ||
| } | ||
|
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| w.Write(data) | ||
| } | ||
|
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| func handleLogin(w http.ResponseWriter, r *http.Request) { | ||
| // the URL which shows the Google Auth page to the user | ||
| url := oauthCfg.AuthCodeURL("") | ||
| http.Redirect(w, r, url, http.StatusFound) | ||
| } | ||
|
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| func handleAuth(w http.ResponseWriter, r *http.Request) { | ||
| // get the code from URL | ||
| err := r.ParseForm() | ||
| if err != nil { // url query part is not valid | ||
| log.Printf("Unable to parse query string: %v", err) | ||
| w.WriteHeader(http.StatusBadRequest) | ||
| return | ||
| } | ||
|
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| // exchange the received code for a bearer token | ||
| code := r.FormValue("code") | ||
| tok, err := oauthCfg.Exchange(r.Context(), code) | ||
| if err != nil { | ||
| log.Printf("Unable to exchange the code %q for token: %v", code, err) | ||
| w.WriteHeader(http.StatusBadRequest) | ||
| return | ||
| } | ||
|
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||
| // save token in the session cookie | ||
| cookie := token.NewSessionCookie(tok) | ||
| log.Printf("Saving new cookie: %s", cookie.String()) | ||
| http.SetCookie(w, cookie) | ||
| http.Redirect(w, r, "/", http.StatusFound) | ||
| } | ||
|
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||
| // sessionMiddleware reads token from session cookie, saves it into the Context. | ||
| func sessionMiddleware(next http.Handler) http.Handler { | ||
| return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { | ||
| log.Println(r.Method, "-", r.RequestURI /*, r.Cookies()*/) | ||
| ctx := token.NewSessionContext(r.Context(), r.Cookies()) | ||
| next.ServeHTTP(w, r.WithContext(ctx)) | ||
| }) | ||
| } |
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