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Story voting #5

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Story voting #5

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298 changes: 298 additions & 0 deletions app/(stories)/actions.ts
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Original file line number Diff line number Diff line change
@@ -1,7 +1,305 @@
"use server";

import { signOut } from "@/app/auth";
import z from "zod";
import { db, usersTable, storiesTable, votesTable, genVoteId } from "@/app/db";
import { auth } from "@/app/auth";
import { sql } from "drizzle-orm";
import { revalidatePath } from "next/cache";
import { unvoteRateLimit, voteRateLimit } from "@/lib/rate-limit";
import { redirect } from "next/navigation";

export async function signOutAction() {
await signOut();
return {};
}

const VoteActionSchema = z.object({
storyId: z.string(),
});

export type VoteActionData = {
error?:
| {
code: "INTERNAL_ERROR";
message: string;
}
| {
code: "VALIDATION_ERROR";
fieldErrors: {
[field: string]: string[];
};
}
| {
code: "RATE_LIMIT_ERROR";
message: string;
}
| {
code: "ALREADY_VOTED_ERROR";
message: string;
};
};

export async function voteAction(
formData: FormData
): Promise<VoteActionData | void> {
const session = await auth();

if (!session?.user?.id) {
redirect("/login");
}

const data = VoteActionSchema.safeParse({
storyId: formData.get("storyId"),
});

if (!data.success) {
return {
error: {
code: "VALIDATION_ERROR",
fieldErrors: data.error.flatten().fieldErrors,
},
};
}

const user = (
await db
.select()
.from(usersTable)
.where(sql`${usersTable.id} = ${session.user.id}`)
.limit(1)
)[0];

if (!user) {
return {
error: {
code: "INTERNAL_ERROR",
message: "User not found",
},
};
}

const rl = await voteRateLimit.limit(user.id);

if (!rl.success) {
return {
error: {
code: "RATE_LIMIT_ERROR",
message: "Too many votes. Try again later",
},
};
}

// TODO: transaction
// await db.transaction(async (tx) => {
const tx = db;
try {
const story = (
await tx
.select({
id: storiesTable.id,
username: storiesTable.username,
submitted_by: storiesTable.submitted_by,
vote_id: votesTable.id,
})
.from(storiesTable)
.where(sql`${storiesTable.id} = ${data.data.storyId}`)
.leftJoin(
votesTable,
sql`${storiesTable.id} = ${votesTable.story_id} AND ${votesTable.user_id} = ${user.id}`
)
.limit(1)
)[0];

if (!story) {
throw new Error("Story not found");
}

if (story.vote_id) {
return {
error: {
code: "ALREADY_VOTED_ERROR",
message: "You already voted for this story",
},
};
}

await Promise.all([
tx.insert(votesTable).values({
id: genVoteId(),
user_id: user.id,
story_id: story.id,
}),
tx
.update(storiesTable)
.set({
points: sql`${storiesTable.points} + 1`,
})
.where(sql`${storiesTable.id} = ${story.id}`),
story.submitted_by
? tx
.update(usersTable)
.set({
karma: sql`${usersTable.karma} + 1`,
})
.where(sql`${usersTable.id} = ${story.submitted_by}`)
: Promise.resolve(),
]);

// revalidate all data, including points for all stories
revalidatePath("/", "layout");

return {};
} catch (err) {
console.error(err);
return {
error: {
code: "INTERNAL_ERROR",
message: "Something went wrong",
},
};
}
}

const UnvoteActionSchema = z.object({
storyId: z.string(),
});

export type UnvoteActionData = {
error?:
| {
code: "INTERNAL_ERROR";
message: string;
}
| {
code: "VALIDATION_ERROR";
fieldErrors: {
[field: string]: string[];
};
}
| {
code: "RATE_LIMIT_ERROR";
message: string;
}
| {
code: "SELF_UNVOTE_ERROR";
message: string;
};
};

export async function unvoteAction(
formData: FormData
): Promise<UnvoteActionData | void> {
const session = await auth();

if (!session?.user?.id) {
redirect("/login");
}

const data = UnvoteActionSchema.safeParse({
storyId: formData.get("storyId"),
});

if (!data.success) {
return {
error: {
code: "VALIDATION_ERROR",
fieldErrors: data.error.flatten().fieldErrors,
},
};
}

const user = (
await db
.select()
.from(usersTable)
.where(sql`${usersTable.id} = ${session.user.id}`)
.limit(1)
)[0];

if (!user) {
return {
error: {
code: "INTERNAL_ERROR",
message: "User not found",
},
};
}

const rl = await unvoteRateLimit.limit(user.id);

if (!rl.success) {
return {
error: {
code: "RATE_LIMIT_ERROR",
message: "Too many unvotes. Try again later",
},
};
}

// TODO: transaction
// await db.transaction(async (tx) => {
const tx = db;
try {
const story = (
await tx
.select({
id: storiesTable.id,
username: storiesTable.username,
submitted_by: storiesTable.submitted_by,
vote_id: votesTable.id,
})
.from(storiesTable)
.where(sql`${storiesTable.id} = ${data.data.storyId}`)
.leftJoin(
votesTable,
sql`${storiesTable.id} = ${votesTable.story_id} AND ${votesTable.user_id} = ${user.id}`
)
.limit(1)
)[0];

if (!story) {
throw new Error("Story not found");
}

if (story.submitted_by === user.id) {
return {
error: {
code: "SELF_UNVOTE_ERROR",
message: "You can't unvote your own story",
},
};
}

await Promise.all([
tx.delete(votesTable).where(sql`${votesTable.id} = ${story.vote_id}`),
tx
.update(storiesTable)
.set({
points: sql`${storiesTable.points} - 1`,
})
.where(sql`${storiesTable.id} = ${story.id}`),
story.submitted_by
? tx
.update(usersTable)
.set({
karma: sql`${usersTable.karma} - 1`,
})
.where(sql`${usersTable.id} = ${story.submitted_by}`)
: Promise.resolve(),
]);

// revalidate all data, including points for all stories
revalidatePath("/", "layout");

return {};
} catch (err) {
console.error(err);
return {
error: {
code: "INTERNAL_ERROR",
message: "Something went wrong",
},
};
}
}
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