StubAttribution.hasValidData = function()

in media/js/base/stub-attribution/stub-attribution.js [550:585]

• 30 lines of code
• 9 McCabe index (conditional complexity)

    StubAttribution.hasValidData = function (data) {
        if (
            typeof data.utm_content === 'string' &&
            typeof data.referrer === 'string'
        ) {
            var content = data.utm_content;
            var charLimit = 150;

            // If utm_content is unusually long, return false early.
            if (content.length > charLimit) {
                return false;
            }

            // Attribution data can be double encoded
            while (content.indexOf('%') !== -1) {
                try {
                    var result = decodeURIComponent(content);
                    if (result === content) {
                        break;
                    }
                    content = result;
                } catch (e) {
                    break;
                }
            }

            // If RTAMO data does not originate from AMO, drop attribution (Issues 10337, 10524).
            if (
                /^rta:/.test(content) &&
                data.referrer.indexOf('https://addons.mozilla.org') === -1
            ) {
                return false;
            }
        }
        return true;
    };