iOS Chromoting Client

remoting/ios/host_refresh.mm

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
+#import "remoting/ios/host_refresh.h"
+
+#import "remoting/ios/authorize.h"
+#import "remoting/ios/host.h"
+#import "remoting/ios/utility.h"
+
+namespace {
+NSString* kDefaultErrorMessage = @"The Host list refresh is not available at "
+    @"this time.  Please try again later.";
+}  // namespace
+
+@interface HostRefresh (Private)
+- (void)authentication:(GTMOAuth2Authentication*)auth
+               request:(NSMutableURLRequest*)request
+                 error:(NSError*)error;
+- (void)formatErrorMessage:(NSString*)error;
+- (void)notifyDelegate;
+@end
+
+// Logic flow begins with refreshHostList, and continues until an error occurs,
+// or the host list is returned to the delegate
+@implementation HostRefresh
+
+@synthesize jsonData = _jsonData;
+@synthesize errorMessage = _errorMessage;
+@synthesize delegate = _delegate;
+
+// Override default constructor and initialize internals
+- (id)init {
+  self = [super init];
+  if (self) {
+    _jsonData = [[NSMutableData alloc] init];
+  }
+  return self;
+}
+
+// Begin the authentication and authorization process.  Begin the process by
+// creating an oAuth2 request to google api's including the needed scopes to
+// fetch the users host list.
+- (void)refreshHostList:(GTMOAuth2Authentication*)authReq
+               delegate:(id<HostRefreshDelegate>)delegate {
+
+  CHECK(_delegate == nil);  // Do not reuse an instance of this class
+
+  _delegate = delegate;
+
+  [Authorize beginRequest:authReq
+                 delegate:self
+        didFinishSelector:@selector(authentication:request:error:)];
+}
+
+// Handle completion of the authorization process. Append service credentials
+// for jabber.  If an error occurred, notify user.
+- (void)authentication:(NSObject*)auth
+               request:(NSMutableURLRequest*)request
+                 error:(NSError*)error {
+  if (error != nil) {
+    [self formatErrorMessage:error.localizedDescription];
+  } else {
+    // Add credentials for service
+    [Authorize appendCredentials:request];
+
+    // Begin connection, the returned reference is not useful right now and
+    // marked as __unused
+    __unused NSURLConnection* connection =
+        [[NSURLConnection alloc] initWithRequest:request delegate:self];
+  }
+}
+
+// @protocol NSURLConnectionDelegate, handle any error during connection
+- (void)connection:(NSURLConnection*)connection
+    didFailWithError:(NSError*)error {
+  [self formatErrorMessage:[error localizedDescription]];
+
+  [self notifyDelegate];
+}
+
+// @protocol NSURLConnectionDataDelegate, may be called async multiple times.
+// Each call appends the new data to the known data until completed.
+- (void)connection:(NSURLConnection*)connection didReceiveData:(NSData*)data {
+  [_jsonData appendData:data];
+}
+
+// @protocol NSURLConnectionDataDelegate
+// Ensure connection succeeded: HTTP 200 OK
+- (void)connection:(NSURLConnection*)connection
+    didReceiveResponse:(NSURLResponse*)response {
+  NSHTTPURLResponse* httpResponse = (NSHTTPURLResponse*)response;
+  if ([response respondsToSelector:@selector(allHeaderFields)]) {
+    NSNumber* responseCode =
+        [[NSNumber alloc] initWithInteger:[httpResponse statusCode]];
+    if (responseCode.intValue != 200) {
+      [self formatErrorMessage:[NSString
+                                   stringWithFormat:@"HTTP STATUS CODE: %d",
+                                                    [httpResponse statusCode]]];
+    }
+  }
+}
+
+// @protocol NSURLConnectionDataDelegate handle a completed connection, parse
+// received data, and return host list to delegate
+- (void)connectionDidFinishLoading:(NSURLConnection*)connection {
+  [self notifyDelegate];
+}
+
+// Store a formatted error message to return later
+- (void)formatErrorMessage:(NSString*)error {
+  _errorMessage = kDefaultErrorMessage;
+  if (error != nil && error.length > 0) {
+    _errorMessage = [_errorMessage
+        stringByAppendingString:[@" " stringByAppendingString:error]];
+  }
+}
+
+// The connection has finished, call to delegate
+- (void)notifyDelegate {
+  if (_jsonData.length == 0 && _errorMessage == nil) {
+    [self formatErrorMessage:nil];
+  }
+
+  [_delegate hostListRefresh:[Host parseListFromJSON:_jsonData]
+                errorMessage:_errorMessage];
+}
+@end