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import { Injectable, InternalServerErrorException, Logger, OnModuleInit } from "@nestjs/common";
import { ConfigService } from "@nestjs/config";
import { createId } from "@paralleldrive/cuid2";
import slugify from "@sindresorhus/slugify";
import { MinioClient, MinioService } from "nestjs-minio-client";
import sharp from "sharp";
import { Config } from "../config/schema";
// Objects are stored under the following path in the bucket:
// "<bucketName>/<userId>/<type>/<fileName>",
// where `userId` is a unique identifier (cuid) for the user,
// where `type` can either be "pictures", "previews" or "resumes",
// and where `fileName` is a unique identifier (cuid) for the file.
type ImageUploadType = "pictures" | "previews";
type DocumentUploadType = "resumes";
export type UploadType = ImageUploadType | DocumentUploadType;
const PUBLIC_ACCESS_POLICY = {
Version: "2012-10-17",
Statement: [
{
Sid: "PublicAccess",
Effect: "Allow",
Action: ["s3:GetObject"],
Principal: { AWS: ["*"] },
Resource: [
"arn:aws:s3:::{{bucketName}}/*/pictures/*",
"arn:aws:s3:::{{bucketName}}/*/previews/*",
"arn:aws:s3:::{{bucketName}}/*/resumes/*",
],
},
],
} as const;
@Injectable()
export class StorageService implements OnModuleInit {
private readonly logger = new Logger(StorageService.name);
private client: MinioClient;
private bucketName: string;
constructor(
private readonly configService: ConfigService<Config>,
private readonly minioService: MinioService,
) {}
async onModuleInit() {
this.client = this.minioService.client;
this.bucketName = this.configService.getOrThrow<string>("STORAGE_BUCKET");
const skipBucketCheck = this.configService.getOrThrow<boolean>("STORAGE_SKIP_BUCKET_CHECK");
if (skipBucketCheck) {
this.logger.warn("Skipping the verification of whether the storage bucket exists.");
this.logger.warn(
"Make sure that the following paths are publicly accessible: `/{pictures,previews,resumes}/*`",
);
return;
}
try {
// Create a storage bucket if it doesn't exist
// if it exists, log that we were able to connect to the storage service
const bucketExists = await this.client.bucketExists(this.bucketName);
if (bucketExists) {
this.logger.log("Successfully connected to the storage service.");
} else {
const bucketPolicy = JSON.stringify(PUBLIC_ACCESS_POLICY).replace(
/{{bucketName}}/g,
this.bucketName,
);
try {
await this.client.makeBucket(this.bucketName);
} catch {
throw new InternalServerErrorException(
"There was an error while creating the storage bucket.",
);
}
try {
await this.client.setBucketPolicy(this.bucketName, bucketPolicy);
} catch {
throw new InternalServerErrorException(
"There was an error while applying the policy to the storage bucket.",
);
}
this.logger.log(
"A new storage bucket has been created and the policy has been applied successfully.",
);
}
} catch (error) {
throw new InternalServerErrorException(error);
}
}
async bucketExists(): Promise<true> {
const exists = await this.client.bucketExists(this.bucketName);
if (!exists) {
throw new InternalServerErrorException(
"There was an error while checking if the storage bucket exists.",
);
}
return exists;
}
async uploadObject(
userId: string,
type: UploadType,
buffer: Buffer,
filename: string = createId(),
): Promise<string> {
const extension = type === "resumes" ? "pdf" : "jpg";
const storageUrl = this.configService.getOrThrow<string>("STORAGE_URL");
let normalizedFilename = slugify(filename);
if (!normalizedFilename) normalizedFilename = createId();
const filepath = `${userId}/${type}/${normalizedFilename}.${extension}`;
const url = `${storageUrl}/${filepath}`;
const metadata =
extension === "jpg"
? { "Content-Type": "image/jpeg" }
: {
"Content-Type": "application/pdf",
"Content-Disposition": `attachment; filename=${normalizedFilename}.${extension}`,
};
try {
if (extension === "jpg") {
// If the uploaded file is an image, use sharp to resize the image to a maximum width/height of 600px
buffer = await sharp(buffer)
.resize({ width: 600, height: 600, fit: sharp.fit.outside })
.jpeg({ quality: 80 })
.toBuffer();
}
await this.client.putObject(this.bucketName, filepath, buffer, metadata);
return url;
} catch {
throw new InternalServerErrorException("There was an error while uploading the file.");
}
}
async deleteObject(userId: string, type: UploadType, filename: string): Promise<void> {
const extension = type === "resumes" ? "pdf" : "jpg";
const path = `${userId}/${type}/${filename}.${extension}`;
try {
await this.client.removeObject(this.bucketName, path);
} catch {
throw new InternalServerErrorException(
`There was an error while deleting the document at the specified path: ${path}.`,
);
}
}
async deleteFolder(prefix: string): Promise<void> {
const objectsList = [];
const objectsStream = this.client.listObjectsV2(this.bucketName, prefix, true);
for await (const object of objectsStream) {
objectsList.push(object.name);
}
try {
await this.client.removeObjects(this.bucketName, objectsList);
} catch {
throw new InternalServerErrorException(
`There was an error while deleting the folder at the specified path: ${this.bucketName}/${prefix}.`,
);
}
}
}
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