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encoding/pem: Decode documentation misleading #53524

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eikenb opened this issue Jun 24, 2022 · 2 comments
Open

encoding/pem: Decode documentation misleading #53524

eikenb opened this issue Jun 24, 2022 · 2 comments
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Documentation NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one.
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@eikenb
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eikenb commented Jun 24, 2022

What is the URL of the page with the issue?

https://pkg.go.dev/encoding/pem

What is your user agent?

Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Firefox/91.0

Screenshot

Screenshot_from_2022-06-23_18-32-30

What did you do?

Used pem.Decode() as described.

What did you expect to see?

To have it "Decode will find the next PEM formatted block (certificate, private key etc) in the input. It returns that block and the remainder of the input."

What did you see instead?

It only found PEM formatted blocks when preceded by a newline, with no characters on the line before the "-----BEGIN" nor on the line after the end's "-----". It wasn't clear until I read the code that it was line by line with these restrictions. The docs made it sound like it looked for the PEM blocks using bytes.Index(bytestream, "-----BEGIN") and like (what I ended up using locally).

IMO the documentation is misleading here and should be fixed.

Thanks!

@eikenb eikenb added the pkgsite label Jun 24, 2022
@gopherbot gopherbot added this to the Unreleased milestone Jun 24, 2022
@eikenb eikenb changed the title x/pkgsite: x/pkgsite: pem.Decode() documentation misleading Jun 24, 2022
@ianlancetaylor ianlancetaylor changed the title x/pkgsite: pem.Decode() documentation misleading encoding/pem: Decode documentation misleading Jun 24, 2022
@ianlancetaylor ianlancetaylor added NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one. and removed Documentation pkgsite labels Jun 24, 2022
@ianlancetaylor
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CC @FiloSottile

@gopherbot
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Change https://go.dev/cl/421636 mentions this issue: encoding/pem: clarify Decode only works on lines

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