从Javascript在iPhone上加载自定义URL方案？

Question

I have an application that uses stringByEvaluatingJavaScriptFromString to modify HTML that I have no access to (like Greasemonkey). Specifically, I want to store the username and password from a login form in NSUserDefaults when the onSubmit event is fired from JS.

I already have a custom URL scheme and an onSubmit handler. I can pass the URL a username and password, and it will store it. I am only having issues with the onSubmit handler: how can I save data with my custom URL before submitting the form?

I am not using any Javascript frameworks, and my code only targets Mobile Safari.

Answer 1

Apologies for not directly answering your question, but I think you may want to consider an easier option. You should be able to sniff a form submission without injecting any javascript into the UIWebView . Just implement something like this in your UIWebViewDelegate :

- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType {
    if ([[[request URL] absoluteString] hasPrefix:@"https://www.thirdpartysite.com/theirLoginScript"]) {
        NSString *username = [self parseUsernameFromRequest:request];
        NSString *password = [self parsePasswordFromRequest:request];
        [self saveUsername:username andPassword:password];
    }
    return YES;
}

I've left the implementations of parseUsernameFromRequest: , parsePasswordFromRequest: , and saveUsername:andPassword: to your imagination.

(Hint: If the form uses the GET method, then you can get its parameters using [[request URL] parameterString] . If the form uses the POST method, then you can use [[NSString alloc] initWithData:[request HTTPBody] encoding:NSUTF8StringEncoding] .)

By the way, you should never store sensitive information like passwords in NSUserDefaults. Apple provides Keychain Services for storing this type of information securely. Unfortunately working with the Keychain Services is surprisingly complex, so you may want to check out Buzz Andersen's Simple iPhone Keychain Code .