如何模拟AJAX调用NSURLProtocol？ [英] How to mock AJAX call with NSURLProtocol?
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问题描述
我的UIWebView这使得AJAX调用外部服务。当离线我需要赶论文请求并返回本地JSON。
我实现了一个NSURLProtocol，我设法抓住了AJAX请求，问题是jQuery的总是返回一个0错误code：
$。阿贾克斯（{
网址：网址，
数据类型：JSON，
的contentType：应用/ JSON
成功：函数（jsonData）{
警报（成功）;
}，
错误：函数（请求，状态，错误）{
警报（失败：+ request.status）;
}
}）;
我总是得到request.status = 0
要测试我的协议，我试图模拟图像我的HTML里面，它的伟大工程。
- HTML请求从google.fr => 正常工作 图像
- 在AJAX亚马逊=调用一个JSON> 失败
下面是我的全面实施：
＃进口EpubProtocol.h
@implementation EpubProtocol
的#pragma马克 - NSURLProtocol
+（BOOL）canInitWithRequest：（的NSURLRequest *）请求{
BOOL awsRequest = [自我请求：请求包含：@s3.amazonaws.com];
BOOL imgRequest = [自我请求：请求包含：@Google.fr的]。
BOOL匹配= awsRequest || imgRequest;
返回匹配;
}
+（的NSURLRequest *）canonicalRequestForRequest：（的NSURLRequest *）theRequest
{
返回theRequest;
}
- （无效）startLoading {
的NSURLRequest *请求= [自我要求]
//模拟亚马逊通话
如果（[EpubProtocol请求：请求包含：@s3.amazonaws.com]）{
的NSString *路径= [[一个NSBundle bundleForClass：self.class] pathForResource：@epub1ofType：@JSON];
的NSData *数据= [NSData的dataWithContentsOfFile：路径]。
[自mockRequest：请求MIMETYPE：@应用程序/ JSON数据：数据]
}
//模拟图像调用
否则，如果（[EpubProtocol请求：请求包含：@Google.fr的]）{
NSOperationQueue *队列= [[NSOperationQueue页头]初始化];
[NSURLConnection的sendAsynchronousRequest：[的NSURLRequest requestWithURL：[NSURL URLWithString：@HTTP：//www.ites$p$psso.fr/wp-content/gallery/yahoo/1-yahoo-logo.jpg]]队列：队列completionHandler ：^（NSURLResponse *响应的NSData *数据，NSError *错误）{
[自mockRequest：请求MIMETYPE：@为image / jpeg的数据：数据]
}];
}
}
- （无效）stopLoading
{
的NSLog（@难道停止加载）;
}
的#pragma马克 - 请求utils的
+（BOOL）要求：（的NSURLRequest *）请求包含：（的NSString *）域{
的NSString *海峡= [[请求URL] absoluteString]。
NS predicate * preD = NS predicate predicateWithFormat：@自包含[CD]％@，域]。
返回[preD evaluateWithObject：STR]。
}
的#pragma马克 - 模拟响应
- （无效）mockRequest：（的NSURLRequest *）要求MIMETYPE：（的NSString *）MIMETYPE数据：（NSData的*）数据{
ID客户端= [自客户端]
NSHTTPURLResponse *响应= [[NSHTTPURLResponse页头] initWithURL：请求URL] MIMETYPE：MIMETYPE expectedContentLength：-1 textEncodingName：无]
[客户端URLProtocol：自didReceiveResponse：响应
cacheStoragePolicy：NSURLCacheStorageNotAllowed]。
[客户端URLProtocol：自didLoadData：数据]
[客户端URLProtocolDidFinishLoading：个体经营];
}
@结束
解决方案
该问题来自WebKit的该块，因为跨域起源请求的响应。由于我们嘲笑的回应，我们必须强制访问控制 - 允许 - 产地。
然后，我们还需要强制内容类型的响应。
这里就是奇迹发生：
的NSDictionary *头= @ {@访问控制 - 允许 - 起源：@*，@访问控制 - 允许 - 头：@内容类型};
NSHTTPURLResponse *响应= [[NSHTTPURLResponse页头] initWithURL：request.URL状态code：200 HTTPVersion：@1.1headerFields：头]
该协议的最终实施：
＃进口EpubProtocol.h
@implementation EpubProtocol
的#pragma马克 - NSURLProtocol
+（BOOL）canInitWithRequest：（的NSURLRequest *）请求{
BOOL isAwsRequest = [自我请求：请求包含：@s3.amazonaws.com];
返回isAwsRequest;
}
+（的NSURLRequest *）canonicalRequestForRequest：（的NSURLRequest *）theRequest
{
返回theRequest;
}
- （无效）startLoading {
的NSURLRequest *请求= [自我要求]
//模拟亚马逊通话
如果（[EpubProtocol请求：请求包含：@s3.amazonaws.com]）{
的NSString *路径= [[一个NSBundle bundleForClass：self.class] pathForResource：@epub1ofType：@JSON];
的NSData *数据= [NSData的dataWithContentsOfFile：路径]。
[自mockRequest：请求数据：数据]
}
}
- （无效）stopLoading
{
的NSLog（@难道停止加载）;
}
的#pragma马克 - 请求utils的
+（BOOL）要求：（的NSURLRequest *）请求包含：（的NSString *）域{
的NSString *海峡= [[请求URL] absoluteString]。
NS predicate * preD = NS predicate predicateWithFormat：@自包含[CD]％@，域]。
返回[preD evaluateWithObject：STR]。
}
的#pragma马克 - 模拟响应
- （无效）mockRequest：（的NSURLRequest *）请求数据：（NSData的*）数据{
ID客户端= [自客户端]
的NSDictionary *头= @ {@访问控制 - 允许 - 起源：@*，@访问控制 - 允许 - 头：@内容类型};
NSHTTPURLResponse *响应= [[NSHTTPURLResponse页头] initWithURL：request.URL状态code：200 HTTPVersion：@1.1headerFields：头]
[客户端URLProtocol：自didReceiveResponse：响应
cacheStoragePolicy：NSURLCacheStorageNotAllowed]。
[客户端URLProtocol：自didLoadData：数据]
[客户端URLProtocolDidFinishLoading：个体经营];
}
@结束
没有什么特别的JS：
函数loadJSONDoc（）
{
VAR URL =https://s3.amazonaws.com/youboox_recette/epub.json;
$阿贾克斯（{
网址：网址，
数据类型：JSON，
的contentType：应用/ JSON
成功：函数（jsonData）{
警报（成功）;
的document.getElementById（myDiv）的innerHTML ='＆其中p为H.;'+ $参数（jsonData）+'＆所述; / P＆GT;';
}，
错误：函数（请求，状态，错误）{
警报（失败：+ request.status）;
}
}）;
}
I have UIWebview that makes AJAX calls to external services. When offline i need to catch theses requests and return local json.
I implemented a NSURLProtocol and i manage to catch the AJAX request, the problem is jquery always return a 0 error code :
$.ajax({
url: url,
dataType: 'json',
contentType: "application/json",
success: function(jsonData){
alert("success :");
},
error: function (request, status, error) {
alert("failure :" + request.status );
}
});
I always get a request.status = 0
To test my protocol I tried to mock an image inside my html and it works great.
- HTML request to an image from google.fr => works fine
- AJAX call to a json on amazon => fails
Here is my full implementation :
#import "EpubProtocol.h"
@implementation EpubProtocol
#pragma mark - NSURLProtocol
+ (BOOL)canInitWithRequest:(NSURLRequest *)request {
BOOL awsRequest = [self request:request contains:@"s3.amazonaws.com"];
BOOL imgRequest = [self request:request contains:@"google.fr"];
BOOL match = awsRequest || imgRequest;
return match;
}
+ (NSURLRequest*)canonicalRequestForRequest:(NSURLRequest*)theRequest
{
return theRequest;
}
- (void)startLoading {
NSURLRequest *request = [self request];
//Mock Amazon call
if([EpubProtocol request:request contains:@"s3.amazonaws.com"]) {
NSString *path = [[NSBundle bundleForClass:self.class] pathForResource:@"epub1" ofType:@"json"];
NSData *data = [NSData dataWithContentsOfFile:path];
[self mockRequest:request mimeType:@"application/json" data:data];
}
//Mock image call
else if([EpubProtocol request:request contains:@"google.fr"]) {
NSOperationQueue *queue = [[NSOperationQueue alloc] init];
[NSURLConnection sendAsynchronousRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:@"http://www.itespresso.fr/wp-content/gallery/yahoo/1-yahoo-logo.jpg"]] queue:queue completionHandler:^(NSURLResponse *response, NSData *data, NSError *error) {
[self mockRequest:request mimeType:@"image/jpeg" data:data];
}];
}
}
- (void)stopLoading
{
NSLog(@"Did stop loading");
}
#pragma mark - Request utils
+ (BOOL) request:(NSURLRequest*)request contains:(NSString*)domain {
NSString *str = [[request URL] absoluteString];
NSPredicate *pred = [NSPredicate predicateWithFormat:@"SELF contains[cd] %@", domain];
return [pred evaluateWithObject:str];
}
#pragma mark - Mock responses
-(void) mockRequest:(NSURLRequest*)request mimeType:(NSString*)mimeType data:(NSData*)data {
id client = [self client];
NSHTTPURLResponse *response = [[NSHTTPURLResponse alloc] initWithURL:[request URL] MIMEType:mimeType expectedContentLength:-1 textEncodingName:nil];
[client URLProtocol:self didReceiveResponse:response
cacheStoragePolicy:NSURLCacheStorageNotAllowed];
[client URLProtocol:self didLoadData:data];
[client URLProtocolDidFinishLoading:self];
}
@end
解决方案
The problem comes from webkit which blocks the response because of cross domain origin request. Since we mock the response we have to force the Access-Control-Allow-Origin.
Then we also need to force the content-type of the response.
Here is where the magic happens :
NSDictionary *headers = @{@"Access-Control-Allow-Origin" : @"*", @"Access-Control-Allow-Headers" : @"Content-Type"};
NSHTTPURLResponse *response = [[NSHTTPURLResponse alloc] initWithURL:request.URL statusCode:200 HTTPVersion:@"1.1" headerFields:headers];
The final implementation of the protocol :
#import "EpubProtocol.h"
@implementation EpubProtocol
#pragma mark - NSURLProtocol
+ (BOOL)canInitWithRequest:(NSURLRequest *)request {
BOOL isAwsRequest = [self request:request contains:@"s3.amazonaws.com"];
return isAwsRequest;
}
+ (NSURLRequest*)canonicalRequestForRequest:(NSURLRequest*)theRequest
{
return theRequest;
}
- (void)startLoading {
NSURLRequest *request = [self request];
//Mock Amazon call
if([EpubProtocol request:request contains:@"s3.amazonaws.com"]) {
NSString *path = [[NSBundle bundleForClass:self.class] pathForResource:@"epub1" ofType:@"json"];
NSData *data = [NSData dataWithContentsOfFile:path];
[self mockRequest:request data:data];
}
}
- (void)stopLoading
{
NSLog(@"Did stop loading");
}
#pragma mark - Request utils
+ (BOOL) request:(NSURLRequest*)request contains:(NSString*)domain {
NSString *str = [[request URL] absoluteString];
NSPredicate *pred = [NSPredicate predicateWithFormat:@"SELF contains[cd] %@", domain];
return [pred evaluateWithObject:str];
}
#pragma mark - Mock responses
-(void) mockRequest:(NSURLRequest*)request data:(NSData*)data {
id client = [self client];
NSDictionary *headers = @{@"Access-Control-Allow-Origin" : @"*", @"Access-Control-Allow-Headers" : @"Content-Type"};
NSHTTPURLResponse *response = [[NSHTTPURLResponse alloc] initWithURL:request.URL statusCode:200 HTTPVersion:@"1.1" headerFields:headers];
[client URLProtocol:self didReceiveResponse:response
cacheStoragePolicy:NSURLCacheStorageNotAllowed];
[client URLProtocol:self didLoadData:data];
[client URLProtocolDidFinishLoading:self];
}
@end
Nothing special in the JS :
function loadJSONDoc()
{
var url = "https://s3.amazonaws.com/youboox_recette/epub.json";
$.ajax({
url: url,
dataType: 'json',
contentType: "application/json",
success: function(jsonData){
alert('success');
document.getElementById("myDiv").innerHTML='<p>'+$.param(jsonData)+'</p>';
},
error: function (request, status, error) {
alert("failure :" + request.status );
}
});
}
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