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var spdx = require('spdx');
var correct = require('spdx-correct');
var validResult = {
validForNewPackages: true,
validForOldPackages: true
};
var genericWarning = (
'license should be ' +
'a valid SPDX license expression without "LicenseRef", ' +
'"UNLICENSED", or ' +
'"SEE LICENSE IN <filename>"'
);
var fileReferenceRE = /^SEE LICEN[CS]E IN (.+)$/;
function startsWith(prefix, string) {
return string.slice(0, prefix.length) === prefix;
}
function usesLicenseRef(ast) {
if (ast.hasOwnProperty('license')) {
var license = ast.license;
return (
startsWith('LicenseRef', license) ||
startsWith('DocumentRef', license)
);
} else {
return (
usesLicenseRef(ast.left) ||
usesLicenseRef(ast.right)
);
}
}
module.exports = function(argument) {
var ast;
try {
ast = spdx.parse(argument);
} catch (e) {
if (
argument === 'UNLICENSED' ||
argument === 'UNLICENCED' ||
fileReferenceRE.test(argument)
) {
return validResult;
} else {
var result = {
validForOldPackages: false,
validForNewPackages: false,
warnings: [genericWarning]
};
var corrected = correct(argument);
if (corrected) {
result.warnings.push(
'license is similar to the valid expression "' + corrected + '"'
);
}
return result;
}
}
if (usesLicenseRef(ast)) {
return {
validForNewPackages: false,
validForOldPackages: false,
warnings: [genericWarning]
};
} else {
return validResult;
}
};
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