fix(ios): load host page, keyboards through a consistent WKURLSchemeHandler #16136
+136
−27
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,95 @@ | ||
| /* | ||
| * Keyman is copyright (C) SIL Global. MIT License. | ||
| * | ||
| * Created by Joshua Horton on 6/24/26. | ||
| * | ||
| * WebViewKeyboardLoader implements a URLSchemeHandler that allows | ||
| * the hosted Keyman Engine for Web to access all files, consistently, | ||
| * via a http-like protocol, preventing CORS access issues for files | ||
| * loaded dynamically. | ||
| */ | ||
|
|
||
| import WebKit | ||
| import UniformTypeIdentifiers | ||
| import os.log | ||
|
|
||
| func getMimeType(forExtension ext: String) -> String { | ||
| // Find the UTType associated with the file extension | ||
| if let utType = UTType(filenameExtension: ext) { | ||
| // Return the preferred MIME type if it exists | ||
| return utType.preferredMIMEType ?? "application/octet-stream" | ||
| } | ||
| return "application/octet-stream" | ||
| } | ||
|
|
||
| class WebViewSchemeHandler: NSObject, WKURLSchemeHandler { | ||
| let storage: Storage | ||
| let scheme = "keyman-engine" | ||
|
|
||
| init(storage: Storage) { | ||
| self.storage = storage | ||
| } | ||
|
|
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| func webView(_ webView: WKWebView, start urlSchemeTask: any WKURLSchemeTask) { | ||
| guard let url = urlSchemeTask.request.url else { | ||
| return | ||
| } | ||
|
|
||
| var components = URLComponents(url: url, resolvingAgainstBaseURL: false)! | ||
| components.scheme = "file" | ||
|
|
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| let fileUrl = components.url | ||
|
|
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| let doError = { () -> Void in | ||
| let message = "Could not load url via WKURLSchemeHandler: \(url)" | ||
| let errorInfo = [ | ||
| NSLocalizedDescriptionKey: message | ||
| ] | ||
| let error = NSError(domain: "WebViewKeyboardLoader", code: 500, userInfo: errorInfo) | ||
|
|
||
| os_log("%{public}s", log:KeymanEngineLogger.settings, type: .error, message) | ||
| SentryManager.capture(error, message: message) | ||
|
|
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| urlSchemeTask.didFailWithError(error) | ||
| } | ||
|
|
||
| guard fileUrl != nil else { | ||
| doError() | ||
| return | ||
| } | ||
|
|
||
| do { | ||
| let fileContents = try Data(contentsOf: fileUrl!) | ||
| let fileExtension = fileUrl!.pathExtension | ||
|
|
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| let mimeType: String = getMimeType(forExtension: fileExtension) | ||
| let charset: String = mimeType.hasPrefix("text/") ? "; charset=utf-8" : "" | ||
|
|
||
| let response = HTTPURLResponse( | ||
| url: url, | ||
| statusCode: 200, | ||
| httpVersion: "HTTP/1.1", | ||
| headerFields: [ | ||
| "Content-Type": "\(mimeType)\(charset)", | ||
| ] | ||
| )! | ||
|
|
||
| urlSchemeTask.didReceive(response) | ||
| urlSchemeTask.didReceive(fileContents) | ||
| urlSchemeTask.didFinish() | ||
| } catch { | ||
| doError() | ||
| return | ||
| } | ||
| } | ||
|
|
||
| func webView(_ webView: WKWebView, stop urlSchemeTask: any WKURLSchemeTask) { | ||
| } | ||
|
|
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| func buildUrlForFile(fileURL: URL) -> URL { | ||
| var loadingURLBuilder = URLComponents() | ||
| loadingURLBuilder.scheme = scheme | ||
| loadingURLBuilder.path = fileURL.path | ||
| return loadingURLBuilder.url! | ||
| } | ||
| } | ||
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