Merge pull request #183 from writeas/T690-invite-instructions

add user invite instructions

Resolves T690

database.go

@@ -2257,6 +2257,19 @@ func (db *datastore) GetUserInvite(id string) (*Invite, error) {
 	return &i, nil
 }
 
+// IsUsersInvite returns true if the user with ID created the invite with code
+// and an error other than sql no rows, if any. Will return false in the event
+// of an error.
+func (db *datastore) IsUsersInvite(code string, userID int64) (bool, error) {
+	var id string
+	err := db.QueryRow("SELECT id FROM userinvites WHERE id = ? AND owner_id = ?", code, userID).Scan(&id)
+	if err != nil && err != sql.ErrNoRows {
+		log.Error("Failed selecting invite: %v", err)
+		return false, err
+	}
+	return id != "", nil
+}
+
 func (db *datastore) GetUsersInvitedCount(id string) int64 {
 	var count int64
 	err := db.QueryRow("SELECT COUNT(*) FROM usersinvited WHERE invite_id = ?", id).Scan(&count)

invites.go

@@ -12,15 +12,16 @@ package writefreely
 
 import (
 	"database/sql"
+	"html/template"
+	"net/http"
+	"strconv"
+	"time"
+
 	"github.com/gorilla/mux"
 	"github.com/writeas/impart"
 	"github.com/writeas/nerds/store"
 	"github.com/writeas/web-core/log"
 	"github.com/writeas/writefreely/page"
-	"html/template"
-	"net/http"
-	"strconv"
-	"time"
 )
 
 type Invite struct {
@@ -114,6 +115,36 @@ func handleViewInvite(app *App, w http.ResponseWriter, r *http.Request) error {
 		return err
 	}
 
+	expired := i.Expired()
+	if !expired && i.MaxUses.Valid && i.MaxUses.Int64 > 0 {
+		// Invite has a max-use number, so check if we're past that limit
+		i.uses = app.db.GetUsersInvitedCount(inviteCode)
+		expired = i.uses >= i.MaxUses.Int64
+	}
+
+	if u := getUserSession(app, r); u != nil {
+		// check if invite belongs to another user
+		// error can be ignored as not important in this case
+		if ownInvite, _ := app.db.IsUsersInvite(inviteCode, u.ID); !ownInvite {
+			addSessionFlash(app, w, r, "You're already registered and logged in.", nil)
+			// show homepage
+			return impart.HTTPError{http.StatusFound, "/me/settings"}
+		}
+
+		// show invite instructions
+		p := struct {
+			*UserPage
+			Invite  *Invite
+			Expired bool
+		}{
+			UserPage: NewUserPage(app, r, u, "Invite to "+app.cfg.App.SiteName, nil),
+			Invite:   i,
+			Expired:  expired,
+		}
+		showUserPage(w, "invite-help", p)
+		return nil
+	}
+
 	p := struct {
 		page.StaticPage
 		Error   string
@@ -124,16 +155,10 @@ func handleViewInvite(app *App, w http.ResponseWriter, r *http.Request) error {
 		Invite:     inviteCode,
 	}
 
-	if i.Expired() {
+	if expired {
 		p.Error = "This invite link has expired."
 	}
 
-	if i.MaxUses.Valid && i.MaxUses.Int64 > 0 {
-		if c := app.db.GetUsersInvitedCount(inviteCode); c >= i.MaxUses.Int64 {
-			p.Error = "This invite link has expired."
-		}
-	}
-
 	// Get error messages
 	session, err := app.sessionStore.Get(r, cookieName)
 	if err != nil {

routes.go

@@ -11,13 +11,14 @@
 package writefreely
 
 import (
+	"net/http"
+	"path/filepath"
+	"strings"
+
 	"github.com/gorilla/mux"
 	"github.com/writeas/go-webfinger"
 	"github.com/writeas/web-core/log"
 	"github.com/writefreely/go-nodeinfo"
-	"net/http"
-	"path/filepath"
-	"strings"
 )
 
 // InitStaticRoutes adds routes for serving static files.
@@ -151,7 +152,7 @@ func InitRoutes(apper Apper, r *mux.Router) *mux.Router {
 	// Handle special pages first
 	write.HandleFunc("/login", handler.Web(viewLogin, UserLevelNoneRequired))
 	write.HandleFunc("/signup", handler.Web(handleViewLanding, UserLevelNoneRequired))
-	write.HandleFunc("/invite/{code}", handler.Web(handleViewInvite, UserLevelNoneRequired)).Methods("GET")
+	write.HandleFunc("/invite/{code}", handler.Web(handleViewInvite, UserLevelOptional)).Methods("GET")
 	// TODO: show a reader-specific 404 page if the function is disabled
 	write.HandleFunc("/read", handler.Web(viewLocalTimeline, UserLevelReader))
 	RouteRead(handler, UserLevelReader, write.PathPrefix("/read").Subrouter())

templates/user/invite-help.tmpl

@@ -0,0 +1,32 @@
+{{define "invite-help"}}
+{{template "header" .}}
+<style>
+  .copy-link {
+    width: 100%;
+    margin: 1rem 0;
+    text-align: center;
+    font-size: 1.2em;
+    color: #555;
+  }
+</style>
+<div class="snug content-container">
+	<h1>Invite to {{.SiteName}}</h1>
+	{{ if .Expired }}
+		<p style="font-style: italic">This invite link is expired.</p>
+	{{ else }}
+		<p>Copy the link below and send it to anyone that you want to join <em>{{ .SiteName }}</em>. You could paste it into an email, instant message, text message, or write it down on paper. Anyone who navigates to this special page will be able to create an account.</p>
+		<input class="copy-link" type="text" name="invite-url" value="{{$.Host}}/invite/{{.Invite.ID}}" onfocus="if (this.select) this.select(); else this.setSelectionRange(0, this.value.length);" readonly />
+		<p>
+			{{ if gt .Invite.MaxUses.Int64 0 }}
+				{{if eq .Invite.MaxUses.Int64 1}}Only <strong>one</strong> user{{else}}Up to <strong>{{.Invite.MaxUses.Int64}}</strong> users{{end}} can sign up with this link.
+				{{if gt .Invite.Uses 0}}So far, <strong>{{.Invite.Uses}}</strong> {{pluralize "person has" "people have" .Invite.Uses}} used it.{{end}}
+				{{if .Invite.Expires}}It expires on <strong>{{.Invite.ExpiresFriendly}}</strong>.{{end}}
+			{{ else }}
+				It can be used as many times as you like{{if .Invite.Expires}} before <strong>{{.Invite.ExpiresFriendly}}</strong>, when it expires{{end}}.
+			{{ end }}
+		</p>
+	{{ end }}
+</div>
+
+{{template "footer" .}}
+{{end}}