1 files changed, 120 insertions, 0 deletions
diff --git a/iPhone/CordovaLib/Classes/CDVUserAgentUtil.m b/iPhone/CordovaLib/Classes/CDVUserAgentUtil.m
new file mode 100755
index 0000000..5c43c51
--- /dev/null
+++ b/iPhone/CordovaLib/Classes/CDVUserAgentUtil.m
@@ -0,0 +1,120 @@
+/*
+ Licensed to the Apache Software Foundation (ASF) under one
+ or more contributor license agreements.  See the NOTICE file
+ distributed with this work for additional information
+ regarding copyright ownership.  The ASF licenses this file
+ to you under the Apache License, Version 2.0 (the
+ "License"); you may not use this file except in compliance
+ with the License.  You may obtain a copy of the License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing,
+ software distributed under the License is distributed on an
+ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ KIND, either express or implied.  See the License for the
+ specific language governing permissions and limitations
+ under the License.
+ */
+
+#import "CDVUserAgentUtil.h"
+
+#import <UIKit/UIKit.h>
+
+// #define VerboseLog NSLog
+#define VerboseLog(...) do {} while (0)
+
+static NSString* const kCdvUserAgentKey = @"Cordova-User-Agent";
+static NSString* const kCdvUserAgentVersionKey = @"Cordova-User-Agent-Version";
+
+static NSString* gOriginalUserAgent = nil;
+static NSInteger gNextLockToken = 0;
+static NSInteger gCurrentLockToken = 0;
+static NSMutableArray* gPendingSetUserAgentBlocks = nil;
+
+@implementation CDVUserAgentUtil
+
++ (NSString*)originalUserAgent
+{
+    if (gOriginalUserAgent == nil) {
+        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(onAppLocaleDidChange:)
+                                                     name:NSCurrentLocaleDidChangeNotification object:nil];
+
+        NSUserDefaults* userDefaults = [NSUserDefaults standardUserDefaults];
+        NSString* systemVersion = [[UIDevice currentDevice] systemVersion];
+        NSString* localeStr = [[NSLocale currentLocale] localeIdentifier];
+        NSString* systemAndLocale = [NSString stringWithFormat:@"%@ %@", systemVersion, localeStr];
+
+        NSString* cordovaUserAgentVersion = [userDefaults stringForKey:kCdvUserAgentVersionKey];
+        gOriginalUserAgent = [userDefaults stringForKey:kCdvUserAgentKey];
+        BOOL cachedValueIsOld = ![systemAndLocale isEqualToString:cordovaUserAgentVersion];
+
+        if ((gOriginalUserAgent == nil) || cachedValueIsOld) {
+            UIWebView* sampleWebView = [[UIWebView alloc] initWithFrame:CGRectZero];
+            gOriginalUserAgent = [sampleWebView stringByEvaluatingJavaScriptFromString:@"navigator.userAgent"];
+
+            [userDefaults setObject:gOriginalUserAgent forKey:kCdvUserAgentKey];
+            [userDefaults setObject:systemAndLocale forKey:kCdvUserAgentVersionKey];
+
+            [userDefaults synchronize];
+        }
+    }
+    return gOriginalUserAgent;
+}
+
++ (void)onAppLocaleDidChange:(NSNotification*)notification
+{
+    // TODO: We should figure out how to update the user-agent of existing UIWebViews when this happens.
+    // Maybe use the PDF bug (noted in setUserAgent:).
+    gOriginalUserAgent = nil;
+}
+
++ (void)acquireLock:(void (^)(NSInteger lockToken))block
+{
+    if (gCurrentLockToken == 0) {
+        gCurrentLockToken = ++gNextLockToken;
+        VerboseLog(@"Gave lock %d", gCurrentLockToken);
+        block(gCurrentLockToken);
+    } else {
+        if (gPendingSetUserAgentBlocks == nil) {
+            gPendingSetUserAgentBlocks = [[NSMutableArray alloc] initWithCapacity:4];
+        }
+        VerboseLog(@"Waiting for lock");
+        [gPendingSetUserAgentBlocks addObject:block];
+    }
+}
+
++ (void)releaseLock:(NSInteger*)lockToken
+{
+    if (*lockToken == 0) {
+        return;
+    }
+    NSAssert(gCurrentLockToken == *lockToken, @"Got token %d, expected %d", *lockToken, gCurrentLockToken);
+
+    VerboseLog(@"Released lock %d", *lockToken);
+    if ([gPendingSetUserAgentBlocks count] > 0) {
+        void (^block)() = [gPendingSetUserAgentBlocks objectAtIndex:0];
+        [gPendingSetUserAgentBlocks removeObjectAtIndex:0];
+        gCurrentLockToken = ++gNextLockToken;
+        NSLog (@"Gave lock %d", gCurrentLockToken);
+        block(gCurrentLockToken);
+    } else {
+        gCurrentLockToken = 0;
+    }
+    *lockToken = 0;
+}
+
++ (void)setUserAgent:(NSString*)value lockToken:(NSInteger)lockToken
+{
+    NSAssert(gCurrentLockToken == lockToken, @"Got token %d, expected %d", lockToken, gCurrentLockToken);
+    VerboseLog(@"User-Agent set to: %@", value);
+
+    // Setting the UserAgent must occur before a UIWebView is instantiated.
+    // It is read per instantiation, so it does not affect previously created views.
+    // Except! When a PDF is loaded, all currently active UIWebViews reload their
+    // User-Agent from the NSUserDefaults some time after the DidFinishLoad of the PDF bah!
+    NSDictionary* dict = [[NSDictionary alloc] initWithObjectsAndKeys:value, @"UserAgent", nil];
+    [[NSUserDefaults standardUserDefaults] registerDefaults:dict];
+}
+
+@end