feat: add waitlist rejection email (#257)

Author: KMKoushik

apps/web/src/app/(dashboard)/admin/waitlist/page.tsx

@@ -78,6 +78,15 @@ export default function AdminWaitlistPage() {
     },
   });
 
+  const rejectWaitlist = api.admin.rejectWaitlistUser.useMutation({
+    onSuccess: () => {
+      toast.success("Rejection email sent");
+    },
+    onError: (error) => {
+      toast.error(error.message ?? "Unable to send rejection email");
+    },
+  });
+
   const onSubmit = (values: SearchInput) => {
     setHasSearched(false);
     setUserResult(null);
@@ -89,6 +98,11 @@ export default function AdminWaitlistPage() {
     updateWaitlist.mutate({ userId: userResult.id, isWaitlisted: checked });
   };
 
+  const handleReject = () => {
+    if (!userResult) return;
+    rejectWaitlist.mutate({ userId: userResult.id });
+  };
+
   if (!isCloud()) {
     return (
       <div className="rounded-lg border bg-muted/30 p-6 text-sm text-muted-foreground">
@@ -166,22 +180,47 @@ export default function AdminWaitlistPage() {
             </div>
           </div>
 
-          <div className="flex flex-wrap items-center justify-between gap-4 border-t pt-4">
-            <div>
-              <p className="text-sm font-medium">Waitlist access</p>
-              <p className="text-sm text-muted-foreground">
-                Toggle to control whether the user remains on the waitlist.
-              </p>
+          <div className="space-y-4 border-t pt-4">
+            <div className="flex flex-wrap items-center justify-between gap-4">
+              <div>
+                <p className="text-sm font-medium">Waitlist access</p>
+                <p className="text-sm text-muted-foreground">
+                  Toggle to control whether the user remains on the waitlist.
+                </p>
+              </div>
+              <div className="flex items-center gap-2">
+                <Switch
+                  checked={userResult.isWaitlisted}
+                  onCheckedChange={handleToggle}
+                  disabled={updateWaitlist.isPending}
+                />
+                {updateWaitlist.isPending ? (
+                  <Spinner className="h-4 w-4" />
+                ) : null}
+              </div>
             </div>
-            <div className="flex items-center gap-2">
-              <Switch
-                checked={userResult.isWaitlisted}
-                onCheckedChange={handleToggle}
-                disabled={updateWaitlist.isPending}
-              />
-              {updateWaitlist.isPending ? (
-                <Spinner className="h-4 w-4" />
-              ) : null}
+
+            <div className="flex flex-wrap items-center justify-between gap-4">
+              <div>
+                <p className="text-sm font-medium">Reject waitlist request</p>
+                <p className="text-sm text-muted-foreground">
+                  Send the applicant a rejection email without changing their waitlist status.
+                </p>
+              </div>
+              <Button
+                type="button"
+                variant="destructive"
+                onClick={handleReject}
+                disabled={rejectWaitlist.isPending}
+              >
+                {rejectWaitlist.isPending ? (
+                  <>
+                    <Spinner className="mr-2 h-4 w-4" /> Sending...
+                  </>
+                ) : (
+                  "Send rejection email"
+                )}
+              </Button>
             </div>
           </div>
         </div>

apps/web/src/server/api/routers/admin.ts

@@ -214,6 +214,67 @@ export const adminRouter = createTRPCRouter({
       return updatedUser;
     }),
 
+  rejectWaitlistUser: adminProcedure
+    .input(
+      z.object({
+        userId: z.number(),
+      })
+    )
+    .mutation(async ({ input }) => {
+      const user = await db.user.findUnique({
+        where: { id: input.userId },
+        select: waitlistUserSelection,
+      });
+
+      if (!user) {
+        throw new Error("User not found");
+      }
+
+      if (!user.email) {
+        throw new Error("User email is missing");
+      }
+
+      const founderEmail = env.FOUNDER_EMAIL ?? undefined;
+      const fallbackFrom = env.FROM_EMAIL ?? env.ADMIN_EMAIL ?? undefined;
+
+      const replyTo = founderEmail ?? fallbackFrom;
+
+      if (!replyTo) {
+        throw new Error("No sender email configured");
+      }
+
+      const fromOverride = founderEmail ?? undefined;
+
+      const text = [
+        "Hello,",
+        "",
+        "Sorry, We cannot proceed with this request at this time, this might affect useSend\u2019s sending reputation.",
+        "",
+        "",
+        "cheers,",
+        "koushik - useSend.com",
+      ].join("\n");
+
+      try {
+        await sendMail(
+          user.email,
+          "useSend: Waitlist request update",
+          text,
+          toPlainHtml(text),
+          replyTo,
+          fromOverride
+        );
+      } catch (error) {
+        logger.error(
+          { userId: user.id, error },
+          "Failed to send waitlist rejection email"
+        );
+        throw new Error("Failed to send waitlist rejection email");
+      }
+
+      return { sent: true };
+    }),
+
   findTeam: adminProcedure
     .input(
       z.object({