Don't assume @id values are of type string.

[BurntSushi]

Instead, we should check if they're a string, and if not, report an error.
Otherwise, this will panic.

[BurntSushi]

N.B. I tried to write a test for this: https://github.com/BurntSushi/json-gold/blob/master/ld/testdata/error-0044-in.jsonld --- But I couldn't get it to work. Currently, the test fails because no error seems to be detected.

[kazarena]

@BurntSushi : your test doesn't fail because it's a valid JSON-LD. Absence of @id property is ok.

I appreciate what you are doing in your PR but I struggle as well to come up with any examples which would cause this piece of code to run. You see, invalid @id is taken care of much earlier in the chain, see https://github.com/kazarena/json-gold/blob/master/ld/api_expand.go#L98. As a result, even if I try to feed it with the following JSON:

{
    "@type": "SocialMediaPosting",
    "@id": {
        "key": "value"
    },
    "url": "http://cctvnews.tumblr.com/post/89361760824/sansha-city-chinas-tropical-outpost-its-been",
    "mainEntityOfPage": true,
    "datePublished": "2014-06-20T14:30:53-04:00",
    "author": "cctvnews",
    "articleBody": "..."
}

the code will return a correct error ('invalid @id value')

How did you come across this issue in the first place?

[BurntSushi]

I came across it because the interface conversion failed and caused a
panic. My intent was to reproduce the issue in your existing test
framework, but that didn't work and I'm not sure why. It looks like my next
step is to reproduce the issue I was hitting in a standalone test. I'll get
back to you soon. :-)

On Oct 5, 2016 4:56 PM, "kazarena" notifications@github.com wrote:

@BurntSushi https://github.com/BurntSushi : your test doesn't fail
because it's a valid JSON-LD. Absence of @id https://github.com/id
property is ok.

I appreciate what you are doing in your PR but I struggle as well to come
up with any examples which would cause this piece of code to run. You see,
invalid @id https://github.com/id is taken care of much earlier in the
chain, see https://github.com/kazarena/json-gold/blob/master/ld/api_
expand.go#L98. As a result, even if I try to feed it with the following
JSON:

{
"@type": "SocialMediaPosting",
"@id": {
"key": "value"
},
"url": "http://cctvnews.tumblr.com/post/89361760824/sansha-city-chinas-tropical-outpost-its-been",
"mainEntityOfPage": true,
"datePublished": "2014-06-20T14:30:53-04:00",
"author": "cctvnews",
"articleBody": "..."
}```

the code will return a correct error ('invalid @id value')

How did you come across this issue in the first place?

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[kazarena]

@BurntSushi : ok, thank you for your efforts! There are two reasons I'm asking about this test case:

1. the fact that it went so deep into the code before failing may indicate some other problems upstream
2. as we are looking into it, we may as well remove the TODO comment above your change