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#include <mbgl/storage/http_context_base.hpp>
#include <mbgl/storage/http_request_base.hpp>
#include <mbgl/storage/resource.hpp>
#include <mbgl/storage/response.hpp>
#include <mbgl/util/async_task.hpp>
#include <mbgl/util/run_loop.hpp>
#import <Foundation/Foundation.h>
#include <map>
#include <cassert>
namespace mbgl {
class HTTPNSURLContext;
class HTTPNSURLRequest : public HTTPRequestBase {
public:
HTTPNSURLRequest(HTTPNSURLContext*, const Resource&, Callback);
~HTTPNSURLRequest();
void cancel() final;
private:
void handleResult(NSData *data, NSURLResponse *res, NSError *error);
void handleResponse();
HTTPNSURLContext *context = nullptr;
bool cancelled = false;
NSURLSessionDataTask *task = nullptr;
std::unique_ptr<Response> response;
util::AsyncTask async;
};
// -------------------------------------------------------------------------------------------------
class HTTPNSURLContext : public HTTPContextBase {
public:
HTTPNSURLContext();
~HTTPNSURLContext();
HTTPRequestBase* createRequest(const Resource&, HTTPRequestBase::Callback) final;
NSURLSession *session = nil;
NSString *userAgent = nil;
NSInteger accountType = 0;
};
HTTPNSURLContext::HTTPNSURLContext() {
@autoreleasepool {
NSURLSessionConfiguration* sessionConfig =
[NSURLSessionConfiguration defaultSessionConfiguration];
sessionConfig.timeoutIntervalForResource = 30;
sessionConfig.HTTPMaximumConnectionsPerHost = 8;
sessionConfig.requestCachePolicy = NSURLRequestReloadIgnoringLocalCacheData;
sessionConfig.URLCache = nil;
session = [NSURLSession sessionWithConfiguration:sessionConfig];
[session retain];
// Write user agent string
userAgent = @"MapboxGL";
accountType = [[NSUserDefaults standardUserDefaults] integerForKey:@"MGLMapboxAccountType"];
}
}
HTTPNSURLContext::~HTTPNSURLContext() {
[session release];
session = nullptr;
[userAgent release];
userAgent = nullptr;
}
HTTPRequestBase* HTTPNSURLContext::createRequest(const Resource& resource, HTTPRequestBase::Callback callback) {
return new HTTPNSURLRequest(this, resource, callback);
}
// -------------------------------------------------------------------------------------------------
HTTPNSURLRequest::HTTPNSURLRequest(HTTPNSURLContext* context_,
const Resource& resource_,
Callback callback_)
: HTTPRequestBase(resource_, callback_),
context(context_),
async([this] { handleResponse(); }) {
// Hold the main loop alive until the request returns. This
// is needed because completion handler runs in another
// thread and will notify this thread using AsyncTask.
util::RunLoop::Get()->ref();
@autoreleasepool {
NSURL* url = [NSURL URLWithString:@(resource.url.c_str())];
if (context->accountType == 0 &&
([url.host isEqualToString:@"mapbox.com"] || [url.host hasSuffix:@".mapbox.com"])) {
NSString* absoluteString = [url.absoluteString
stringByAppendingFormat:(url.query ? @"&%@" : @"?%@"), @"events=true"];
url = [NSURL URLWithString:absoluteString];
}
NSMutableURLRequest* req = [NSMutableURLRequest requestWithURL:url];
if (resource.priorEtag) {
[req addValue:@(resource.priorEtag->c_str())
forHTTPHeaderField:@"If-None-Match"];
} else if (resource.priorModified) {
[req addValue:@(util::rfc1123(*resource.priorModified).c_str())
forHTTPHeaderField:@"If-Modified-Since"];
}
[req addValue:context->userAgent forHTTPHeaderField:@"User-Agent"];
task = [context->session
dataTaskWithRequest:req
completionHandler:^(NSData* data, NSURLResponse* res, NSError* error) {
handleResult(data, res, error);
}];
[task retain];
[task resume];
}
}
HTTPNSURLRequest::~HTTPNSURLRequest() {
util::RunLoop::Get()->unref();
assert(!task);
}
void HTTPNSURLRequest::handleResponse() {
if (task) {
[task release];
task = nullptr;
}
if (!cancelled) {
assert(response);
notify(*response);
}
delete this;
}
void HTTPNSURLRequest::cancel() {
cancelled = true;
if (task) {
[task cancel];
[task release];
task = nullptr;
} else {
delete this;
}
}
void HTTPNSURLRequest::handleResult(NSData *data, NSURLResponse *res, NSError *error) {
response = std::make_unique<Response>();
using Error = Response::Error;
if (error) {
if ([error code] == NSURLErrorCancelled) {
response.reset();
} else {
if (data) {
response->data =
std::make_shared<std::string>((const char*)[data bytes], [data length]);
}
switch ([error code]) {
case NSURLErrorBadServerResponse: // 5xx errors
response->error = std::make_unique<Error>(
Error::Reason::Server, [[error localizedDescription] UTF8String]);
break;
case NSURLErrorNetworkConnectionLost:
case NSURLErrorCannotFindHost:
case NSURLErrorCannotConnectToHost:
case NSURLErrorDNSLookupFailed:
case NSURLErrorNotConnectedToInternet:
case NSURLErrorInternationalRoamingOff:
case NSURLErrorCallIsActive:
case NSURLErrorDataNotAllowed:
case NSURLErrorTimedOut:
response->error = std::make_unique<Error>(
Error::Reason::Connection, [[error localizedDescription] UTF8String]);
break;
default:
response->error = std::make_unique<Error>(
Error::Reason::Other, [[error localizedDescription] UTF8String]);
break;
}
}
} else if ([res isKindOfClass:[NSHTTPURLResponse class]]) {
const long responseCode = [(NSHTTPURLResponse *)res statusCode];
response->data = std::make_shared<std::string>((const char *)[data bytes], [data length]);
NSDictionary *headers = [(NSHTTPURLResponse *)res allHeaderFields];
NSString *cache_control = [headers objectForKey:@"Cache-Control"];
if (cache_control) {
response->expires = parseCacheControl([cache_control UTF8String]);
}
NSString *expires = [headers objectForKey:@"Expires"];
if (expires) {
response->expires = util::parseTimePoint([expires UTF8String]);
}
NSString *last_modified = [headers objectForKey:@"Last-Modified"];
if (last_modified) {
response->modified = util::parseTimePoint([last_modified UTF8String]);
}
NSString *etag = [headers objectForKey:@"ETag"];
if (etag) {
response->etag = std::string([etag UTF8String]);
}
if (responseCode == 200) {
// Nothing to do; this is what we want.
} else if (responseCode == 304) {
response->notModified = true;
response->data.reset();
} else if (responseCode == 404) {
response->error =
std::make_unique<Error>(Error::Reason::NotFound, "HTTP status code 404");
} else if (responseCode >= 500 && responseCode < 600) {
response->error =
std::make_unique<Error>(Error::Reason::Server, std::string{ "HTTP status code " } +
std::to_string(responseCode));
} else {
response->error =
std::make_unique<Error>(Error::Reason::Other, std::string{ "HTTP status code " } +
std::to_string(responseCode));
}
} else {
// This should never happen.
response->error = std::make_unique<Error>(Error::Reason::Other,
"Response class is not NSHTTPURLResponse");
}
async.send();
}
std::unique_ptr<HTTPContextBase> HTTPContextBase::createContext() {
return std::make_unique<HTTPNSURLContext>();
}
}
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