A GoPDF ErrWrongPassword result means the password supplied to that opening attempt matched neither the PDF’s user password nor its owner password. It does not prove that the supplier sent the wrong password, that the PDF is undamaged, or that other GoPDF operations will accept the file. Treat attachment access, invoice validation, and delivery as separate stages.
What GoPDF’s wrong-password error means
The GoPDF pdf package documentation says: “ErrWrongPassword reports that the supplied password matched neither the user nor the owner password.” GoPDF pdf package documentation distinguishes this from other outcomes:
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ErrEncrypted: the PDF needs a password because opening it with an empty user password did not work.ErrWrongPassword: a password was supplied, but it matched neither the user nor owner password.ErrUnsupportedEncryption: GoPDF cannot read the PDF’s security handler or encryption scheme.
These are the library’s interpretations of the attempted operation, not a diagnosis of who supplied an incorrect credential or whether the file is structurally sound. A password failure is not the same as a malformed-file error, and repeatedly trying credentials is not an appropriate response to unsupported encryption.
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Check which GoPDF operation is opening the attachment
GoPDF’s ordinary opening entry points can open files encrypted with an empty user password without additional work. When a password is required, the project documentation shows supplying one with pdf.WithPassword(...); it accepts either the user or owner password. Its example checks errors with errors.Is(err, pdf.ErrEncrypted) and then checks for pdf.ErrWrongPassword. GoPDF project documentation
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That example describes password-aware opening, not a complete supplier-invoice intake policy. Also check what happens next: the documented Merger and Editor entry points do not yet accept a password and handle encrypted input only when its user password is empty. A successful password-capable open therefore does not establish that a later merge or edit can consume the same encrypted file.
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Use a controlled intake path before retrying or transforming the PDF. The following are operational recommendations from the title-matched handling article, not requirements stated by GoPDF or a regulator. Supplier invoice handling guidance
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- Retain the exact received bytes. Keep the original attachment unchanged; perform inspection on a working copy so later checks can be tied to what was actually received.
- Record limited intake metadata. Capture a digest, byte count, intake time, and restricted correlation identifier. Avoid putting raw PDFs, passwords, or extracted invoice contents in ordinary logs.
- Verify the credential mapping. Check that the password lookup belongs to the specific supplier and document version. Ask the supplier for a corrected credential through an approved channel rather than repeating the same secret across invoice jobs.
- Classify the parser result. Distinguish password required, wrong password, unsupported encryption, and structural failure. If access succeeds, track subsequent extraction or rendering separately: authentication can succeed while a later stage still fails.
- Record the attachment state. Keep states such as pending, accessible, unsupported, or structurally invalid distinct from invoice validation and delivery status.
Decide explicitly whether delivery waits
Attachment access and invoice generation answer different questions. Order validation should remain based on trusted order data rather than text extracted from a supplier attachment. Whether delivery can proceed while that attachment is pending is a business-policy decision, not a rule established by GoPDF or the handling guidance.
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- If policy permits delivery without the attachment, mark it explicitly as pending or omitted; do not report it as successfully included.
Make the selected branch visible and auditable so a password error cannot silently turn into a false “attachment included” status.
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Test recovery and rollback paths
The handling article recommends testing the workflow with fixtures covering an open PDF, an encrypted PDF with a wrong credential, the same PDF with the correct credential, a truncated input, and an unsupported file. These are suggested test cases, not reported test results.
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- Verify that each fixture produces a distinct, recorded attachment state rather than collapsing every failure into “wrong password.”
- Exercise both delivery-policy branches: hold when the attachment is required, and proceed with an explicit pending state when policy allows.
- Confirm that invoice amounts remain tied to trusted order data, not values extracted from the attachment.
- Ensure recovery preserves the original received bytes and that a corrected credential does not overwrite or erase the earlier failure record.
What this error does not establish
- It does not establish that the supplier intentionally sent an incorrect password; the credential may be mismapped to the supplier or document version.
- It does not establish that the PDF is intact. A separate structural or later extraction failure may still occur.
- It does not mean every encryption failure is a password mismatch; GoPDF documents unsupported encryption as a separate condition.
- It does not establish that merging or editing will work after password-aware opening; those entry points have documented limits for encrypted inputs.
- It does not decide whether an invoice may be delivered without its attachment; that depends on the organization’s explicit policy.
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