// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#import "ios/net/protocol_handler_util.h"
#include <string>
#include "base/base64.h"
#include "base/logging.h"
#include "base/strings/sys_string_conversions.h"
#include "base/time/time.h"
#include "ios/net/crn_http_url_response.h"
#import "net/base/apple/url_conversions.h"
#include "net/base/net_errors.h"
#include "net/http/http_request_headers.h"
#include "net/http/http_response_headers.h"
#include "net/http/http_version.h"
#include "net/url_request/referrer_policy.h"
#include "net/url_request/url_request.h"
#include "url/buildflags.h"
#include "url/gurl.h"
#if !BUILDFLAG(USE_PLATFORM_ICU_ALTERNATIVES)
#include "base/i18n/encoding_detection.h" // nogncheck
#include "base/i18n/icu_string_conversions.h" // nogncheck
#endif // !BUILDFLAG(USE_PLATFORM_ICU_ALTERNATIVES)
namespace {
// "Content-Type" HTTP header.
NSString* const kContentType = @"Content-Type";
} // namespace
namespace net {
NSString* const kNSErrorDomain = @"org.chromium.net.ErrorDomain";
NSError* GetIOSError(NSInteger ns_error_code,
int net_error_code,
NSString* url,
const base::Time& creation_time) {
// The error we pass through has the domain NSURLErrorDomain, an IOS error
// code, and a userInfo dictionary in which we smuggle more detailed info
// about the error from our network stack. This dictionary contains the
// failing URL, and a nested error in which we deposit the original error code
// passed in from the Chrome network stack.
// The nested error has domain:kNSErrorDomain, code:|original_error_code|,
// and userInfo:nil; this NSError is keyed in the dictionary with
// NSUnderlyingErrorKey.
NSDate* creation_date = creation_time.ToNSDate();
DCHECK(creation_date);
NSError* underlying_error =
[NSError errorWithDomain:kNSErrorDomain code:net_error_code userInfo:nil];
DCHECK(url);
NSDictionary* dictionary = @{
NSURLErrorFailingURLStringErrorKey : url,
@"CreationDate" : creation_date,
NSUnderlyingErrorKey : underlying_error,
};
return [NSError errorWithDomain:NSURLErrorDomain
code:ns_error_code
userInfo:dictionary];
}
NSURLResponse* GetNSURLResponseForRequest(URLRequest* request) {
NSURL* url = NSURLWithGURL(request->url());
DCHECK(url);
// Iterate over all the headers and copy them.
bool has_content_type_header = false;
NSMutableDictionary* header_fields = [NSMutableDictionary dictionary];
HttpResponseHeaders* headers = request->response_headers();
if (headers != nullptr) {
size_t iter = 0;
std::string name, value;
while (headers->EnumerateHeaderLines(&iter, &name, &value)) {
NSString* key = base::SysUTF8ToNSString(name);
if (!key) {
DLOG(ERROR) << "Header name is not in UTF8: " << name;
// Skip the invalid header.
continue;
}
// Do not copy "Cache-Control" headers as we provide our own controls.
if ([key caseInsensitiveCompare:@"cache-control"] == NSOrderedSame)
continue;
if ([key caseInsensitiveCompare:kContentType] == NSOrderedSame) {
key = kContentType;
has_content_type_header = true;
}
// Handle bad encoding.
NSString* v = base::SysUTF8ToNSString(value);
if (!v) {
DLOG(ERROR) << "Header \"" << name << "\" is not in UTF8: " << value;
#if BUILDFLAG(USE_PLATFORM_ICU_ALTERNATIVES)
DCHECK(FALSE) << "ICU support is required, but not included.";
continue;
#else
// Infer the encoding, or skip the header if it's not possible.
std::string encoding;
if (!base::DetectEncoding(value, &encoding))
continue;
std::string value_utf8;
if (!base::ConvertToUtf8AndNormalize(value, encoding, &value_utf8))
continue;
v = base::SysUTF8ToNSString(value_utf8);
DCHECK(v);
#endif // !BUILDFLAG(USE_PLATFORM_ICU_ALTERNATIVES)
}
// Duplicate keys are appended using a comma separator (RFC 2616).
NSMutableString* existing = [header_fields objectForKey:key];
if (existing) {
[existing appendFormat:@",%@", v];
} else {
[header_fields setObject:[NSMutableString stringWithString:v]
forKey:key];
}
}
}
// WebUI does not define a "Content-Type" header. Use the MIME type instead.
if (!has_content_type_header) {
std::string mime_type = "";
request->GetMimeType(&mime_type);
NSString* type = base::SysUTF8ToNSString(mime_type);
if ([type length])
[header_fields setObject:type forKey:kContentType];
}
NSString* content_type = [header_fields objectForKey:kContentType];
if (content_type) {
NSRange range = [content_type rangeOfString:@","];
// If there are several "Content-Type" headers, keep only the first one.
if (range.location != NSNotFound) {
[header_fields setObject:[content_type substringToIndex:range.location]
forKey:kContentType];
}
}
// Use a "no-store" cache control to ensure that the response is not cached
// by the system. See b/7045043.
[header_fields setObject:@"no-store" forKey:@"Cache-Control"];
// Parse the HTTP version.
NSString* version_string = @"HTTP/1.1";
if (headers) {
const HttpVersion& http_version = headers->GetHttpVersion();
version_string = [NSString stringWithFormat:@"HTTP/%hu.%hu",
http_version.major_value(),
http_version.minor_value()];
}
return [[CRNHTTPURLResponse alloc] initWithURL:url
statusCode:request->GetResponseCode()
HTTPVersion:version_string
headerFields:header_fields];
}
void CopyHttpHeaders(NSURLRequest* in_request, URLRequest* out_request) {
DCHECK(out_request->extra_request_headers().IsEmpty());
NSDictionary* headers = [in_request allHTTPHeaderFields];
HttpRequestHeaders net_headers;
NSString* key;
for (key in headers) {
if ([key isEqualToString:@"Referer"]) {
// The referrer must be set through the set_referrer method rather than as
// a header.
out_request->SetReferrer(
base::SysNSStringToUTF8([headers objectForKey:key]));
// If the referrer is explicitly set, we don't want the network stack to
// strip it.
out_request->set_referrer_policy(net::ReferrerPolicy::NEVER_CLEAR);
continue;
}
// Copy over all headers that were set on NSURLRequest
NSString* value = [headers objectForKey:key];
net_headers.SetHeader(base::SysNSStringToUTF8(key),
base::SysNSStringToUTF8(value));
}
// Set default values for some missing headers.
// The "Accept" header is defined by Webkit on the desktop version.
net_headers.SetHeaderIfMissing("Accept", "*/*");
// The custom NSURLProtocol example from Apple adds a default "Content-Type"
// header for non-empty POST requests. This suggests that this header can be
// missing, and Chrome network stack does not add it by itself.
if (out_request->has_upload() && out_request->method() == "POST") {
DLOG_IF(WARNING, !net_headers.HasHeader(HttpRequestHeaders::kContentType))
<< "Missing \"Content-Type\" header in POST request.";
net_headers.SetHeaderIfMissing(HttpRequestHeaders::kContentType,
"application/x-www-form-urlencoded");
}
out_request->SetExtraRequestHeaders(net_headers);
}
} // namespace net
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