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Graph/blob-upload-prefix-mismatch

AntiPattern

Blob Upload Prefix Mismatch

blob-upload-prefix-mismatch

A recurring upload-path construction mismatch where server-side storage settings (e.g., prefix/subdirectory) are ignored because the pathname is rebuilt manually, leading files to land in the storage root instead of the intended folder hierarchy.

Node Details

Public graph metadata

Updated4/30/2026

Connections

30 linked nodes

MATCHESSolution

the issue was that I was passing in the Data URI as well with the encoding of the file. Outcome: make sure that the string of the file that you're sending doesn't contain this value: `data:@file/png;base64,`.

MATCHESSolution

const __dirname = path.dirname(fileURLToPath(import.meta.url)); — handleComponents(body, user). Tension: The file literally exists but i keep getting this error. Outcome: this fixed it for me.

MATCHESSolution

You can use the `prefix` field to set a sub-directory. — vercelBlobStorage({ enabled: true, collections: { media: { prefix: 'cms_images', }, }, token: process.env.BLOB_READ_WRITE_TOKEN, }). Tension: As of now, there's no fix for this. Outcome: You can manually handle uploads as shown here.

MATCHESSolution

Use upload(`content/temp/${file.name}`, file, { handleUploadUrl, clientPayload }) and return the pathname settings from onBeforeGenerateToken()

MATCHESSolution

Store uploads in the serverless writable temp directory (os.tmpdir()) during the request and then persist the files externally (e.g., upload to object storage like S3) or stream them directly; update the Multer storage destination to use os.tmpdir() and avoid serving from a project-local uploads folder.

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The way I optimized the images was by using an absolute path. Tension: In this case, the solution depends on the API implementation.

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you CANNOT use public folder for serving dynamic images — then create a endpoint that read it. Tension: public folder for serving dynamic images. Outcome: you can try to create another folder in project root then create a endpoint that read it with `fs.readFileSync`.

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For simply use, we upload source file to release base on commit for only once. — I uploaded source file to same release for multiple times. Tension: I upload source files with different urlPrefix to reuse the same release. Outcome: do not use same name.

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I also usually add a prefix to the artifact name — Upload Build Artifact. Outcome: env: ARTIFACTS_PREFIX: wf-${{ github.workflow_sha }}-${{ github.run_number }}.

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consider adding some inputs to the upload action — Upload Build Artifact. Tension: artifact not found for name: build.

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After allowing the prefix, everything was working fine — PreReceived hook on Github. Tension: branch names are created with a specific prefix. Outcome: you will need to add the prefix in this feature too.

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we can use a normal `/` instead of escaping the slash — This file was auto-generated by the Firebase CLI. Tension: Directory 'dist\arkdia-app' for Hosting does not exist. Outcome: "public": "dist/arkdia-app".

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As of 5/8/2025, the only known workaround is to download the file and upload it using LocalBlob. Tension: the only known workaround. Outcome: download the file and upload it using LocalBlob.

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Adding http-auth-2.30.4.jar to the classpath — Exception while uploading a file to AWS S3. Outcome: resolves this issue and the Exception no longer occurs.

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adding a class that extends `OutputStream` and creates a multi-part upload when the buffer reaches the set limit — AWS minimum is 5MB. Tension: end size of the zip can be tens of GB. Outcome: I set it to 10MB.

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Configure the S3 client to use path-style addressing by adding `.forcePathStyle(true)` on the `S3AsyncClientBuilder` to restore the previous behavior (e.g., matching SDK 2.17).

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with url from rails_blob_url, which would be converted to a temporary URL each time the text is loaded from the database — with ActiveStorage urls_expire_in 30 min option. Tension: or is this not the right way at all.

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I needed to use the MultipartCopy class found in the S3 SDK. Tension: Over 4.5 GB - Use MultipartCopy. Outcome: This is now working...

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make sure that the `write.object-storage.enabled` property is set to true — This will make sure the objects are distributed across the prefixes.

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var md5Based64 = Convert.ToBase64Str — Upload using RestSharp: (failed - Bad Digest). Tension: BadDigest - The Content-MD5 you specified did not match what we received. Outcome: both have the same inputs.

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Looking for a local upload to my Minio remote place — I tried the sample code given in MinIo SDK documentation. Tension: i can't reach a solution.

MATCHESSolution

upload an empty folder and specify the following settings in the upload configuration. — If your bucket policy prevents uploading objects to this bucket without tags, metadata, or access control list (ACL) grantees. Tension: you can't create a folder by using the following procedure. Outcome: Instead, upload an empty folder and specify the following settings in the upload configuration.

MATCHESSolution

Just changing the order of the form data in the frontend code worked for me. — uploading the file from Browser. Tension: Aws error message was misleading. Outcome: I just interchanged the position of `x-amz-signature` and `x-amz-security-token`.

MATCHESSolution

Use a collection with upload: true, submit a FormData POST to /api/media with file, then update the document with the returned file id

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Images are stored in a secure, isolated directory. — Temporary storage introduces risks if not managed correctly. Tension: even in case of errors. Outcome: Images are deleted promptly after processing.

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In Dedicated App Service Plan. Outcome: Use `AzureWebJobsStorage__blobServiceUri` if you are using the URL of the storage account.

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large file uploads in Spring Boot. Tension: you never hit this limit. Outcome: Once I stopped sending the file in JSON, the problem disappeared.

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And multipart file locationCreateFile = fileUpload. Tension: the API consistently picks up the old file instead of the modified version. Outcome: Then status 200.

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Create separate FileFields/Storage instances with the correct backend option by using `bucket_name` (e.g., `S3BotoStorage(bucket_name='other-bucket')`) so uploads go to the intended public bucket.

MATCHESSolution

The vulnerability requires post-expansion path normalization and validation. — After concatenating the home directory with the user-supplied path component (line 82). Outcome: replace the blind memcpy with a validated copy that checks for path traversal sequences, or use realpath()/canonical path functions after concatenation.

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