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72 lines
2.1 KiB
Markdown
72 lines
2.1 KiB
Markdown
# BUD-06
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## Upload requirements
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`draft` `optional`
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Defines how clients can verify if the upload can be completed before sending the blob to the server. This mechanism helps prevent unnecessary traffic to other endpoints by rejecting files based on their hash, size, MIME type or other server-specific requirements.
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## HEAD /upload - Upload requirements
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The `HEAD /upload` endpoint MUST use the `X-SHA-256`, `X-Content-Type` and `X-Content-Length` headers sent by client to get the sha256 hash, MIME type and size of the blob that will be uploaded, returning a HTTP status code and a custom header `X-Reason` to indicate some human readable message about the upload requirements.
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### Headers
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- `X-SHA-256`: A lowercase hex-encoded sha256 string that represents the blob's hash.
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- `X-Content-Length`: An integer that represents the blob size in bytes.
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- `X-Content-Type`: A string that specifies the blob's MIME type, like `application/pdf` or `image/png`.
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### Upload Authorization
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Servers MAY require authorization for this endpoint as defined by [BUD-11](./11.md#endpoint-authorization-requirements).
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### Examples
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Example request from the client:
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```http
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X-Content-Type: application/pdf
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X-Content-Length: 184292
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X-SHA-256: 88a74d0b866c8ba79251a11fe5ac807839226870e77355f02eaf68b156522576
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```
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Example response from the server if the upload can be done:
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```http
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HTTP/1.1 200 OK
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```
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If the upload cannot proceed, the server MUST return an appropriate `4xx` HTTP status code and a custom header `X-Reason` with a human readable error message.
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Some examples of error messages:
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```http
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HTTP/1.1 400 Bad Request
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X-Reason: Invalid X-SHA-256 header format. Expected a string.
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```
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```http
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HTTP/1.1 401 Unauthorized
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X-Reason: Authorization required for uploading video files.
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```
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```http
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HTTP/1.1 403 Forbidden
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X-Reason: SHA-256 hash banned.
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```
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```http
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HTTP/1.1 411 Length Required
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X-Reason: Missing X-Content-Length header.
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```
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```http
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HTTP/1.1 413 Content Too Large
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X-Reason: File too large. Max allowed size is 100MB.
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```
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```http
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HTTP/1.1 415 Unsupported Media Type
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X-Reason: Unsupported file type.
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```
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