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further specify the format of iri-references throughout #1085

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further specify the format of iri-references throughout #1085

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13 changes: 8 additions & 5 deletions meta/core.json
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Original file line number Diff line number Diff line change
Expand Up @@ -10,14 +10,15 @@
"type": ["object", "boolean"],
"properties": {
"$id": {
"$ref": "#/$defs/iriReferenceString",
"type": "string",
"format": "iri-reference",
"$comment": "Non-empty fragments not allowed.",
"pattern": "^[^#]*#?$"
},
"$schema": { "$ref": "#/$defs/iriString" },
"$ref": { "$ref": "#/$defs/iriReferenceString" },
"$ref": { "$ref": "#/$defs/iriReferenceToSchemaString" },
"$anchor": { "$ref": "#/$defs/anchorString" },
"$dynamicRef": { "$ref": "#/$defs/iriReferenceString" },
"$dynamicRef": { "$ref": "#/$defs/iriReferenceToSchemaString" },
"$dynamicAnchor": { "$ref": "#/$defs/anchorString" },
"$vocabulary": {
"type": "object",
Expand All @@ -43,9 +44,11 @@
"type": "string",
"format": "iri"
},
"iriReferenceString": {
"iriReferenceToSchemaString": {
"type": "string",
"format": "iri-reference"
"format": "iri-reference",
"$comment": "any fragment must be empty, or match anchor or json-pointer syntax",
"pattern": "^[^#]*(#([A-Za-z_][-A-Za-z0-9.:_]*|/([^~]|~[01])*))?$"
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Suggested change
"pattern": "^[^#]*(#([A-Za-z_][-A-Za-z0-9.:_]*|/([^~]|~[01])*))?$"
"pattern": "^[^#]*(#([A-Za-z_][-A-Za-z0-9.:_]*|(/([^~/]|~[01])*)*))?$"

The second half of the fragment match, for JSON Pointer, won't match the empty pointer ($ref: "#", $ref: "foo#"). The suggested change follows the JSON Pointer ABNF.

This is still incomplete though. Fragments may contain %xx encoded characters. In a pointer their use may be necessary, but in either a pointer or anchor they are expected to be treated like the characters they represent, even when those characters don't actually need to be %-encoded.

Suggested change
"pattern": "^[^#]*(#([A-Za-z_][-A-Za-z0-9.:_]*|/([^~]|~[01])*))?$"
"pattern": "^[^#]*(#(([A-Za-z_]|%[A-Fa-f0-9]{2})([-A-Za-z0-9.:_]|%[A-Fa-f0-9]{2})*|((/|%2[fF])([^~/%]|~[01]|%[A-Fa-f0-9]{2})*)*))?$"

Not too pretty, but I think it allows anything that's valid. It won't reject some invalid anchors or pointers if they're %-encoded - it would be possible to express the same character ranges as allowed combinations of %-encoded digits, but I'm not masochistic enough to do it.

I'm a little uncertain describing a uri fragment with a regex isn't more trouble than it's worth.

}
}
}
4 changes: 3 additions & 1 deletion output/schema.json
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Expand Up @@ -19,7 +19,9 @@
},
"absoluteKeywordLocation": {
"type": "string",
"format": "uri"
"format": "iri",
"$comment": "any fragment must be non-empty, and use json-pointer syntax",
"pattern": "^[^#]*(#(/([^~]|~[01])*)*)?$"
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The comment says must be non-empty, but this does allow an empty fragment.

Suggested change
"pattern": "^[^#]*(#(/([^~]|~[01])*)*)?$"
"pattern": "^[^#]*(#(/([^~/]|~[01])*)+)?$"

The change to + requires a non-empty pointer; disallowing the / from the reference-token character range is better consistent with its spec's ABNF (and iriReferenceToSchemaString above), though it doesn't ultimately change what the regex matches.

And of course %-encoding needs fixing here too.

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actually I think we need to allow empty fragments, so it's the comment that is wrong here.

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@karenetheridge Agreed, you need to be able to represent the root with a JSON Pointer fragment, which would be an empty fragment.

},
"instanceLocation": {
"type": "string",
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3 changes: 1 addition & 2 deletions schema.json
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Expand Up @@ -51,8 +51,7 @@
},
"$recursiveRef": {
"$comment": "\"$recursiveRef\" has been replaced by \"$dynamicRef\".",
"type": "string",
"format": "uri-reference",
"$ref": "meta/core#/$defs/iriReferenceToSchemaString",
"deprecated": true
}
}
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