Using multiple JSON lists in iOS Content Blocker - ios

Question

I am trying to create my own content blocker on iOS. I was wanting to create separate json lists for different types of content (tracking, ads, adult sites, etc). I came across this https://github.com/calebhicks/ios-safari-content-blocking which stated you could create an array of "attachments" instead of relying on the singular "blockerList" json file.
func beginRequest(with context: NSExtensionContext) {
var jsonFiles:Array<NSItemProvider> = Array()
let attachment = NSItemProvider(contentsOf: Bundle.main.url(forResource: "blockerList", withExtension: "json"))!
jsonFiles.append(attachment)
let attachment2 = NSItemProvider(contentsOf: Bundle.main.url(forResource: "testList", withExtension: "json"))!
jsonFiles.append(attachment2)
let item = NSExtensionItem()
item.attachments = jsonFiles
context.completeRequest(returningItems: [item], completionHandler: nil)
}
Most of this code is the default from the Content Blocker Extension setup, but what I have added is the jsonFiles array which attachment and attachment2 are placed in. When this is run, only one of the two rule sets is loaded, never a combination of the two. Any ideas on why only one ruleset is loaded?

Answer 1

You can combine two JSON rule files in to one file and use that file.
import UIKit
import MobileCoreServices
class ContentBlockerRequestHandler: NSObject, NSExtensionRequestHandling {
func beginRequest(with context: NSExtensionContext) {
let sharedContainerURL = FileManager.default.containerURL(forSecurityApplicationGroupIdentifier: "you app group identifier")
let sourceURLRules = sharedContainerURL?.appendingPathComponent("Rules1.json")
let sourceURLRules2 = sharedContainerURL?.appendingPathComponent("Rules2.json")
do {
let jsonDecoder = JSONDecoder()
let dataFormRules1 = try Data(contentsOf: sourceURLRules1!, options: .mappedIfSafe)// Rule is Decode able Swift class
let rulesArray1 = try? jsonDecoder.decode(Array<Rule>.self,from: dataFormRules1)
let dataFormRules2 = try Data(contentsOf: sourceURLRules2!, options: .mappedIfSafe)
let rulesArray2 = try? jsonDecoder.decode(Array<Rule>.self,from: dataFormRules2)
saveCombinedRuleFile(ruleList: rulesArray1! + rulesArray2!)
} catch {
//handle error condition
}
let sourceURLCombinedRule = sharedContainerURL?.appendingPathComponent("CombinedRule.json")
let combinedRuleAttachment = NSItemProvider(contentsOf: sourceURLCombinedRule)
let item = NSExtensionItem()
item.attachments = [combinedRuleAttachment]
context.completeRequest(returningItems: [item], completionHandler: nil)
}
func saveCombinedRuleFile(ruleList:[Rule]) {
let encoder = JSONEncoder()
if let encoded = try? encoder.encode(ruleList) {
let sharedContainerURL = FileManager.default.containerURL(forSecurityApplicationGroupIdentifier: "you app group identifier")
if let json = String(data: encoded, encoding: .utf8) {
print(json)
}
if let destinationURL = sharedContainerURL?.appendingPathComponent("CombinedRule.json") {
do {
try encoded.write(to: destinationURL)
} catch {
print ("catchtry")
}
}
}
}
}