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Graph/signed-upload-metadata-mismatch

AntiPattern

Signed Upload Misconfig

signed-upload-metadata-mismatch

Pre-signed URL uploads fail or behave inconsistently when request metadata/headers, client runtime constraints, or build/content readiness are mismatched, causing wrong object keys, browser blocks, or truncated/overflowed payloads.

Node Details

Public graph metadata

Updated6/27/2026

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,`.

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

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Create a POST request to generate a signedUrl on the server — Send that URL to the client and POST the upload form with image to the S3 bucket. Tension: bypassing the server. Outcome: With that url you can POST directly to S3.

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

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Configure the webhook route to use raw body handling (e.g., Express `express.raw({ type: 'application/json' })` in the Strapi webhook controller/route) and ensure the Stripe-Signature header is forwarded to the verifier so signature verification can use the unmodified raw payload.

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Use a `preParsing` hook to adjust parsing behavior (e.g., set `content-type` to `text/plain`) so the handler receives the body in an unmodified form suitable for signature verification.

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Use a clean percent-encoded presigned URL and allow access via pre-signed URLs in the S3 bucket policy

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It is also only possible to create presigned URLs with expiration times greater than 36 hours — by using IAM users with an access and secret key.

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Those values require encoding per RFC 2047 — Using `x-amz-meta-filename` suggests that the user-provided meta-data is transferred via HTTP request headers. Tension: This does not work with AWS. Outcome: One Idea was to use the Base64 encoding and do the wrapping/quoting/envelope with string concatenation.

MATCHESSolution

$safeName = (new Slugify())->slugify($pathinfo['filename']) . '.' . $pathinfo['extension']; — Backend code that generates the presigned URL. Tension: AWS does not allow Unicode characters in `key`. Outcome: the original filenames will not be preserved anywhere.

MATCHESSolution

Adding `x-amz-meta-author` to the headers for the PUT request allowed the data to be available in the `HeadObjectCommand` — fetch(signedURL, { method: 'PUT', headers: {. Tension: `x-amz-meta-author` is nowhere to be found. Outcome: Metadata: { author: 'John Doe' }.

MATCHESSolution

when calling fetch — you created a pre-signed URL that includes a Content-Type header. Tension: you didn't indicate that header later when you used the URL.

MATCHESSolution

Have you tried using the v4 token signing process on Cloud CDN? — No need to expose your S3 bucket publicly. Tension: Cloud CDN will be sending the "published hostname" towards the origin destination. Outcome: This will generate an emphemal access token to access a private AWS S3 bucket using your AWS IAM credentials.

MATCHESSolution

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.

MATCHESSolution

Include the Tagging value when creating the PutObjectCommand and ensure the presigner signs the x-amz-tagging header by passing `unhoistableHeaders: new Set(['x-amz-tagging'])`. Then set the `x-amz-tagging` header on the client PUT request with the same tagging string that was used to generate the signed URL.

MATCHESSolution

I needed to do the following instead: — s3.createPresignedPost(params, (err, data) => {. Tension: which DID return the key back in the fields. Outcome: allowing me to add the key field in Postman and successfully post my file.

MATCHESSolution

Use the `.presignURL` extension on the `GetObjectInput` and `PutObjectInput` structs — for downloading & uploading S3 objects. Tension: generate pre-signed URLs for downloading & uploading S3 objects. Outcome: Here is a fully working example I wrote:.

MATCHESSolution

For multipart + pre-signed uploads from expo react-native with express backend is as follows: — upload a large video file the fastest on RN Expo.

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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Only allow specific file types (JPG, PNG) and impose size limits (OWASP) — Input Validation and Sanitization. Tension: prevent injection attacks. Outcome: Validate and sanitize all uploaded images.

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Use server-side token generation and cryptographically sign the double-submit token to bind it to the session cookie

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Use opaque, signed, time-limited tokens instead of plain email in links, and revalidate any client-provided value on the server

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JWT implementations hash the header.payload bytes with SHA-256 to produce a fixed-length digest, then sign that digest; this keeps signatures smaller and makes signing/verifying efficient while preserving integrity.

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Submit the form as POST while overriding the method using the `_method: 'patch'` field, and ensure `forceFormData: true` is set so the file is sent as multipart data.

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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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Build a GetObjectRequest with responseContentType and responseContentDisposition, then pass it to GetObjectPresignRequest

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Failed to encode MIC. Tension: I want to sign the MDN based on the AS2 request. Outcome: Data must be specified.

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Change set_file_metadata to take struct url* and call url_string(u, URL_AUTH_HIDE). Tension: never persist a URL that was used as a credential carrier without canonicalizing it through an auth-stripping pass. Outcome: This is what upstream did in wget 1.20.1.

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