Date parsing fails

[mehulkar]

I have frontmatter like this:

---
title: 'cool title'
date: 2012-01-11
categories: foo
---

This fails with:

FrontMatterParser::Parser.parse_file(str)
#=> Psych::DisallowedClass: Tried to load unspecified class: Date

I'm pretty sure the root cause is ruby/psych#262 and that the parser is attempting to run Date.new('2012-01-11'), but I haven't nailed it down yet.

I might be able to write a customer parser to overwrite how the frontmatter is being parsed, I guess?

Was wondering if there was a different solution or if anyone had any insight?

[icco]

👋 You could append your date with a time as a quick fix.

require "front_matter_parser"
prsr = FrontMatterParser::Parser.new(:md)
body = "---\ntitle: 'cool title'\ncategories: foo\ndatetime: 2017-03-16 18:05:42 +0000 UTC\n---\n"
prsr.call(body)

[waiting-for-dev]

Hey @mehulkar , thanks for reporting.

Indeed, it seems a psych issue.

This library uses YAML ruby standard library, which uses psych under the hood, to load the front matter. I don't think we should move away from the standard solution.

Also, this library calls YAML.safe_load instead of YAML.load. The bug only affects to the former, but I don't want to change and use load because it is dangerous for user provided content.

As long as the bug is not solved, you could do as @icco says or implement your own loader. For example, if you are parsing from a well known source and you don't need to protect against user content, you could safely use load instead of safe_load:

unsafe_loader = ->(string) { YAML.load(string) }

# And then...

# For a file
FrontMatterParser::Parser.parse_file('example.md', loader: unsafe_loader)

# For a string
FrontMatterParser::Parser.new(:md, loader: unsafe_loader).call(string)

[mehulkar]

Thanks @waiting-for-dev! and hi @icco! :) let me know when you're on the west coast again!