Provide error page for age gated profiles

src/lib/utils/body.js

@@ -3,17 +3,40 @@ const {Parser} = require("./parser/parser")
 
 /**
  * @param {string} text
+ * @returns {{status: symbol, value: any}}
  */
 function extractSharedData(text) {
 	const parser = new Parser(text)
 	const index = parser.seek("window._sharedData = ", {moveToMatch: true, useEnd: true})
-	if (index === -1) throw constants.symbols.NO_SHARED_DATA
+	if (index === -1) {
+		// Maybe the profile is age restricted?
+		const age = getRestrictedAge(text)
+		if (age !== null) { // Correct.
+			return {status: constants.symbols.extractor_results.AGE_RESTRICTED, value: age}
+		}
+		return {status: constants.symbols.extractor_results.NO_SHARED_DATA, value: null}
+	}
 	parser.store()
 	const end = parser.seek(";</script>")
 	parser.restore()
 	const sharedDataString = parser.slice(end - parser.cursor)
 	const sharedData = JSON.parse(sharedDataString)
-	return sharedData
+	return {status: constants.symbols.extractor_results.SUCCESS, value: sharedData}
+}
+
+/**
+ * @param {string} text
+ */
+function getRestrictedAge(text) {
+	const parser = new Parser(text)
+	let index = parser.seek("<h2>Restricted profile</h2>", {moveToMatch: true, useEnd: true})
+	if (index === -1) return null
+	index = parser.seek("<p>", {moveToMatch: true, useEnd: true})
+	if (index === -1) return null
+	const explanation = parser.get({split: "</p>"}).trim()
+	const match = explanation.match(/You must be (\d+?) years? old or over to see this profile/)
+	if (!match) return null
+	return +match[1] // the age
 }
 
 module.exports.extractSharedData = extractSharedData

src/lib/utils/parser/parser.js

@@ -37,6 +37,7 @@ class Parser {
 	}
 
 	/**
+	 * Get the next element from the buffer, either up to a token or between two tokens, and update the cursor.
 	 * @param {GetOptions} [options]
 	 * @returns {String}
 	 */
@@ -123,7 +124,7 @@ class Parser {
 	}
 
 	/**
-	 * Seek past the next occurance of the string.
+	 * Seek to or past the next occurance of the string.
 	 * @param {string} toFind
 	 * @param {{moveToMatch?: boolean, useEnd?: boolean}} options both default to false
 	 */