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b:["$","section",null,{"children":[["$","h1",null,{"className":"text-2xl font-bold tracking-tighter","children":["$","$Le",null,{"children":"Integrate AWS S3 with NestJS for private and public files storage"}]}],["$","div",null,{"className":"mb-8 mt-2 flex items-center justify-between text-sm text-neutral-600 dark:text-neutral-400","children":["$","p",null,{"children":["May 5, 2024"," - ","10 min read"]}]}],[["$","article",null,{"className":"prose prose-neutral dark:prose-invert prose-quoteless  max-w-none","children":[["$","$Lf",null,{"src":"/_static/blogs/aws-s3-nestjs/thumbnail.png","width":1280,"height":720,"alt":"thumbnail","className":"rounded-lg"}],"\n",["$","p",null,{"children":"Goal of this article is to create a resuable DMS (Document Management System) service using NestJS and Amazon Simple Storage Service (S3) version3 SDK\r\nthat should be able to:"}],"\n",["$","ul",null,{"children":["\n",["$","li",null,{"children":"Store public and private files in single S3 bucket."}],"\n",["$","li",null,{"children":"Generate pre-signed URLs for private files."}],"\n",["$","li",null,{"children":"Perform CRUD operations on S3 objects using NestJS."}],"\n"]}],"\n",["$","h2",null,{"id":"introduction","children":[["$","a",null,{"className":"anchor","href":"#introduction","children":["$","span",null,{"className":"icon icon-link"}]}],"Introduction"]}],"\n",["$","p",null,{"children":"By default every object(file) uploaded in AWS S3 bucket is private. So only the owner of the object can access the object."}],"\n",["$","p",null,{"children":"There might be case where you want to store both public and private files in single S3 bucket.\r\nFor example, you want to store user's profile picture as private and some static files like images, videos, etc. as public."}],"\n",["$","p",null,{"children":"There are multiple ways to store the public and private files in AWS S3 bucket."}],"\n",["$","ul",null,{"children":["\n",["$","li",null,{"children":"Creating separate buckets for public and private files."}],"\n",["$","li",null,{"children":"Using different folders for public and private files in single bucket using bucket policies."}],"\n"]}],"\n",["$","div",null,{"data-rehype-pretty-code-fragment":"","children":["$","pre",null,{"data-language":"json","data-theme":"default","children":["$","code",null,{"data-language":"json","data-theme":"default","style":{"display":"grid"},"children":[["$","span",null,{"data-line":"","children":["$","span",null,{"style":{"color":"#ABB2BF"},"children":"{"}]}],"\n",["$","span",null,{"data-line":"","children":[["$","span",null,{"style":{"color":"#ABB2BF"},"children":"    "}],["$","span",null,{"style":{"color":"#E06C75"},"children":"\"Version\""}],["$","span",null,{"style":{"color":"#ABB2BF"},"children":": "}],["$","span",null,{"style":{"color":"#98C379"},"children":"\"2012-10-17\""}],["$","span",null,{"style":{"color":"#ABB2BF"},"children":","}]]}],"\n",["$","span",null,{"data-line":"","children":[["$","span",null,{"style":{"color":"#ABB2BF"},"children":"    "}],["$","span",null,{"style":{"color":"#E06C75"},"children":"\"Statement\""}],["$","span",null,{"style":{"color":"#ABB2BF"},"children":": ["}]]}],"\n",["$","span",null,{"data-line":"","children":["$","span",null,{"style":{"color":"#ABB2BF"},"children":"        {"}]}],"\n",["$","span",null,{"data-line":"","children":[["$","span",null,{"style":{"color":"#ABB2BF"},"children":"            "}],["$","span",null,{"style":{"color":"#E06C75"},"children":"\"Effect\""}],["$","span",null,{"style":{"color":"#ABB2BF"},"children":": "}],["$","span",null,{"style":{"color":"#98C379"},"children":"\"Allow\""}],["$","span",null,{"style":{"color":"#ABB2BF"},"children":","}]]}],"\n",["$","span",null,{"data-line":"","children":[["$","span",null,{"style":{"color":"#ABB2BF"},"children":"            "}],["$","span",null,{"style":{"color":"#E06C75"},"children":"\"Principal\""}],["$","span",null,{"style":{"color":"#ABB2BF"},"children":": "}],["$","span",null,{"style":{"color":"#98C379"},"children":"\"*\""}],["$","span",null,{"style":{"color":"#ABB2BF"},"children":","}]]}],"\n",["$","span",null,{"data-line":"","children":[["$","span",null,{"style":{"color":"#ABB2BF"},"children":"            "}],["$","span",null,{"style":{"color":"#E06C75"},"children":"\"Action\""}],["$","span",null,{"style":{"color":"#ABB2BF"},"children":": "}],["$","span",null,{"style":{"color":"#98C379"},"children":"\"s3:GetObject\""}],["$","span",null,{"style":{"color":"#ABB2BF"},"children":","}]]}],"\n",["$","span",null,{"data-line":"","children":[["$","span",null,{"style":{"color":"#ABB2BF"},"children":"            "}],["$","span",null,{"style":{"color":"#E06C75"},"children":"\"Resource\""}],["$","span",null,{"style":{"color":"#ABB2BF"},"children":": "}],["$","span",null,{"style":{"color":"#98C379"},"children":"\"arn:aws:s3:::my-bucket-name/public/*\""}]]}],"\n",["$","span",null,{"data-line":"","children":["$","span",null,{"style":{"color":"#ABB2BF"},"children":"        }"}]}],"\n",["$","span",null,{"data-line":"","children":["$","span",null,{"style":{"color":"#ABB2BF"},"children":"    ]"}]}],"\n",["$","span",null,{"data-line":"","children":["$","span",null,{"style":{"color":"#ABB2BF"},"children":"}"}]}]]}]}]}],"\n",["$","ul",null,{"children":["\n",["$","li",null,{"children":["Set the ACL (Access Control List) of the object to ",["$","code",null,{"children":"public-read"}]," or ",["$","code",null,{"children":"private"}]," while uploading the object."]}],"\n"]}],"\n",["$","p",null,{"children":"In this article we will explore the third option, i.e. storing both public and private files setting the ACL to each objects in single S3 bucket and generating pre-signed URLs for private files using NestJS and AWS SDK v3."}],"\n",["$","ul",null,{"children":["\n",["$","li",null,{"children":["\n",["$","p",null,{"children":["For ",["$","code",null,{"children":"public"}]," files, we will set the ACL to ",["$","code",null,{"children":"public-read"}]," while uploading the object. And once the server returns the URL of the object, the user can access the object using the URL. There won't be any expiration time for the URL so no need to generate extra URL for public files."]}],"\n"]}],"\n",["$","li",null,{"children":["\n",["$","p",null,{"children":["If you are storing the ",["$","code",null,{"children":"private"}]," files in S3 bucket, you can generate a pre-signed URL for the object and provide it to the user. The user can access the object using the pre-signed URL for the limited time. After the expiration time, the URL will no longer be valid."]}],"\n"]}],"\n"]}],"\n",["$","p",null,{"children":"It might be useful when you want to :"}],"\n",["$","ul",null,{"children":["\n",["$","li",null,{"children":"validate the user before providing access to the object."}],"\n",["$","li",null,{"children":"check the user's subscription before providing access to the object."}],"\n",["$","li",null,{"children":"provide access to the object with specific access permissions, expiration times, and cryptographic signatures, ensuring that only authorized users can access the content."}],"\n"]}],"\n",["$","h2",null,{"id":"setup","children":[["$","a",null,{"className":"anchor","href":"#setup","children":["$","span",null,{"className":"icon icon-link"}]}],"Setup"]}],"\n",["$","h4",null,{"id":"aws-s3-bucket-configuration","children":[["$","a",null,{"className":"anchor","href":"#aws-s3-bucket-configuration","children":["$","span",null,{"className":"icon icon-link"}]}],"AWS S3 Bucket Configuration"]}],"\n",["$","ul",null,{"children":["\n",["$","li",null,{"children":["Create a new S3 bucket in ",["$","a",null,{"target":"_blank","rel":"noopener noreferrer","href":"https://console.aws.amazon.com/s3/","children":"AWS console"}]]}],"\n"]}],"\n",["$","p",null,{"children":"Initially the creation page will look like this:"}],"\n",["$","$Lf",null,{"src":"/_static/blogs/aws-s3-nestjs/initial-bucket-page.png","width":1280,"height":720,"alt":"website card","className":"rounded-lg"}],"\n",["$","p",null,{"children":"Three things to note while creating the bucket:"}],"\n",["$","ul",null,{"children":["\n",["$","li",null,{"children":"Fillout the bucket name"}],"\n",["$","li",null,{"children":"change ownership to ACLs enabled"}],"\n",["$","li",null,{"children":"uncheck the block all public access."}],"\n"]}],"\n",["$","$Lf",null,{"src":"/_static/blogs/aws-s3-nestjs/final-bucket-page.png","width":1280,"height":720,"alt":"website 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