Qiu Yuzhou 184bf068b7 update outdated pods | 3 年 前 | |
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GCDWebServer | 3 年 前 | |
LICENSE | 8 年 前 | |
README.md | 3 年 前 |
GCDWebServer is a modern and lightweight GCD based HTTP 1.1 server designed to be embedded in iOS, macOS & tvOS apps. It was written from scratch with the following goals in mind:
Extra built-in features:
Included extensions:
GCDWebServer
that implements an interface for uploading and downloading files using a web browserGCDWebServer
that implements a class 1 WebDAV server (with partial class 2 support for macOS Finder)What's not supported (but not really required from an embedded HTTP server):
Requirements:
Download or check out the latest release of GCDWebServer then add the entire "GCDWebServer" subfolder to your Xcode project. If you intend to use one of the extensions like GCDWebDAVServer or GCDWebUploader, add these subfolders as well. Finally link to libz
(via Target > Build Phases > Link Binary With Libraries) and add $(SDKROOT)/usr/include/libxml2
to your header search paths (via Target > Build Settings > HEADER_SEARCH_PATHS).
Alternatively, you can install GCDWebServer using CocoaPods by simply adding this line to your Podfile:
pod "GCDWebServer", "~> 3.0"
If you want to use GCDWebUploader, use this line instead:
pod "GCDWebServer/WebUploader", "~> 3.0"
Or this line for GCDWebDAVServer:
pod "GCDWebServer/WebDAV", "~> 3.0"
And finally run $ pod install
.
You can also use Carthage by adding this line to your Cartfile (3.2.5 is the first release with Carthage support):
github "swisspol/GCDWebServer" ~> 3.2.5
Then run $ carthage update
and add the generated frameworks to your Xcode projects (see Carthage instructions).
For help with using GCDWebServer, it's best to ask your question on Stack Overflow with the gcdwebserver
tag. For bug reports and enhancement requests you can use issues in this project.
Be sure to read this entire README first though!
These code snippets show how to implement a custom HTTP server that runs on port 8080 and returns a "Hello World" HTML page to any request. Since GCDWebServer uses GCD blocks to handle requests, no subclassing or delegates are needed, which results in very clean code.
IMPORTANT: If not using CocoaPods, be sure to add the libz
shared system library to the Xcode target for your app.
macOS version (command line tool):
#import "GCDWebServer.h"
#import "GCDWebServerDataResponse.h"
int main(int argc, const char* argv[]) {
@autoreleasepool {
// Create server
GCDWebServer* webServer = [[GCDWebServer alloc] init];
// Add a handler to respond to GET requests on any URL
[webServer addDefaultHandlerForMethod:@"GET"
requestClass:[GCDWebServerRequest class]
processBlock:^GCDWebServerResponse *(GCDWebServerRequest* request) {
return [GCDWebServerDataResponse responseWithHTML:@"<html><body><p>Hello World</p></body></html>"];
}];
// Use convenience method that runs server on port 8080
// until SIGINT (Ctrl-C in Terminal) or SIGTERM is received
[webServer runWithPort:8080 bonjourName:nil];
NSLog(@"Visit %@ in your web browser", webServer.serverURL);
}
return 0;
}
iOS version:
#import "GCDWebServer.h"
#import "GCDWebServerDataResponse.h"
@interface AppDelegate : NSObject <UIApplicationDelegate> {
GCDWebServer* _webServer;
}
@end
@implementation AppDelegate
- (BOOL)application:(UIApplication*)application didFinishLaunchingWithOptions:(NSDictionary*)launchOptions {
// Create server
_webServer = [[GCDWebServer alloc] init];
// Add a handler to respond to GET requests on any URL
[_webServer addDefaultHandlerForMethod:@"GET"
requestClass:[GCDWebServerRequest class]
processBlock:^GCDWebServerResponse *(GCDWebServerRequest* request) {
return [GCDWebServerDataResponse responseWithHTML:@"<html><body><p>Hello World</p></body></html>"];
}];
// Start server on port 8080
[_webServer startWithPort:8080 bonjourName:nil];
NSLog(@"Visit %@ in your web browser", _webServer.serverURL);
return YES;
}
@end
macOS Swift version (command line tool):
webServer.swift
import Foundation
import GCDWebServer
func initWebServer() {
let webServer = GCDWebServer()
webServer.addDefaultHandler(forMethod: "GET", request: GCDWebServerRequest.self, processBlock: {request in
return GCDWebServerDataResponse(html:"<html><body><p>Hello World</p></body></html>")
})
webServer.start(withPort: 8080, bonjourName: "GCD Web Server")
print("Visit \(webServer.serverURL) in your web browser")
}
WebServer-Bridging-Header.h
#import <GCDWebServer/GCDWebServer.h>
#import <GCDWebServer/GCDWebServerDataResponse.h>
GCDWebUploader is a subclass of GCDWebServer
that provides a ready-to-use HTML 5 file uploader & downloader. This lets users upload, download, delete files and create directories from a directory inside your iOS app's sandbox using a clean user interface in their web browser.
Simply instantiate and run a GCDWebUploader
instance then visit http://{YOUR-IOS-DEVICE-IP-ADDRESS}/
from your web browser:
#import "GCDWebUploader.h"
@interface AppDelegate : NSObject <UIApplicationDelegate> {
GCDWebUploader* _webUploader;
}
@end
@implementation AppDelegate
- (BOOL)application:(UIApplication*)application didFinishLaunchingWithOptions:(NSDictionary*)launchOptions {
NSString* documentsPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) firstObject];
_webUploader = [[GCDWebUploader alloc] initWithUploadDirectory:documentsPath];
[_webUploader start];
NSLog(@"Visit %@ in your web browser", _webUploader.serverURL);
return YES;
}
@end
GCDWebDAVServer is a subclass of GCDWebServer
that provides a class 1 compliant WebDAV server. This lets users upload, download, delete files and create directories from a directory inside your iOS app's sandbox using any WebDAV client like Transmit (Mac), ForkLift (Mac) or CyberDuck (Mac / Windows).
GCDWebDAVServer should also work with the macOS Finder as it is partially class 2 compliant (but only when the client is the macOS WebDAV implementation).
Simply instantiate and run a GCDWebDAVServer
instance then connect to http://{YOUR-IOS-DEVICE-IP-ADDRESS}/
using a WebDAV client:
#import "GCDWebDAVServer.h"
@interface AppDelegate : NSObject <UIApplicationDelegate> {
GCDWebDAVServer* _davServer;
}
@end
@implementation AppDelegate
- (BOOL)application:(UIApplication*)application didFinishLaunchingWithOptions:(NSDictionary*)launchOptions {
NSString* documentsPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) firstObject];
_davServer = [[GCDWebDAVServer alloc] initWithUploadDirectory:documentsPath];
[_davServer start];
NSLog(@"Visit %@ in your WebDAV client", _davServer.serverURL);
return YES;
}
@end
GCDWebServer includes a built-in handler that can recursively serve a directory (it also lets you control how the "Cache-Control" header should be set):
macOS version (command line tool):
#import "GCDWebServer.h"
int main(int argc, const char* argv[]) {
@autoreleasepool {
GCDWebServer* webServer = [[GCDWebServer alloc] init];
[webServer addGETHandlerForBasePath:@"/" directoryPath:NSHomeDirectory() indexFilename:nil cacheAge:3600 allowRangeRequests:YES];
[webServer runWithPort:8080];
}
return 0;
}
You start by creating an instance of the GCDWebServer
class. Note that you can have multiple web servers running in the same app as long as they listen on different ports.
Then you add one or more "handlers" to the server: each handler gets a chance to handle an incoming web request and provide a response. Handlers are called in a LIFO queue, so the latest added handler overrides any previously added ones.
Finally you start the server on a given port.
GCDWebServer's architecture consists of only 4 core classes:
GCDWebServer
to handle each new HTTP connection. Each instance stays alive until the connection is closed. You cannot use this class directly, but it is exposed so you can subclass it to override some hooks.GCDWebServerConnection
instance after HTTP headers have been received. It wraps the request and handles the HTTP body if any. GCDWebServer comes with several subclasses of GCDWebServerRequest
to handle common cases like storing the body in memory or stream it to a file on disk.GCDWebServerResponse
to handle common cases like HTML text in memory or streaming a file from disk.GCDWebServer relies on "handlers" to process incoming web requests and generating responses. Handlers are implemented with GCD blocks which makes it very easy to provide your own. However, they are executed on arbitrary threads within GCD so special attention must be paid to thread-safety and re-entrancy.
Handlers require 2 GCD blocks:
GCDWebServerMatchBlock
is called on every handler added to the GCDWebServer
instance whenever a web request has started (i.e. HTTP headers have been received). It is passed the basic info for the web request (HTTP method, URL, headers...) and must decide if it wants to handle it or not. If yes, it must return a new GCDWebServerRequest
instance (see above) created with this info. Otherwise, it simply returns nil.GCDWebServerProcessBlock
or GCDWebServerAsyncProcessBlock
is called after the web request has been fully received and is passed the GCDWebServerRequest
instance created at the previous step. It must return synchronously (if using GCDWebServerProcessBlock
) or asynchronously (if using GCDWebServerAsyncProcessBlock
) a GCDWebServerResponse
instance (see above) or nil on error, which will result in a 500 HTTP status code returned to the client. It's however recommended to return an instance of GCDWebServerErrorResponse on error so more useful information can be returned to the client.Note that most methods on GCDWebServer
to add handlers only require the GCDWebServerProcessBlock
or GCDWebServerAsyncProcessBlock
as they already provide a built-in GCDWebServerMatchBlock
e.g. to match a URL path with a Regex.
New in GCDWebServer 3.0 is the ability to process HTTP requests asynchronously i.e. add handlers to the server which generate their GCDWebServerResponse
asynchronously. This is achieved by adding handlers that use a GCDWebServerAsyncProcessBlock
instead of a GCDWebServerProcessBlock
. Here's an example:
(Synchronous version) The handler blocks while generating the HTTP response:
[webServer addDefaultHandlerForMethod:@"GET"
requestClass:[GCDWebServerRequest class]
processBlock:^GCDWebServerResponse *(GCDWebServerRequest* request) {
GCDWebServerDataResponse* response = [GCDWebServerDataResponse responseWithHTML:@"<html><body><p>Hello World</p></body></html>"];
return response;
}];
(Asynchronous version) The handler returns immediately and calls back GCDWebServer later with the generated HTTP response:
[webServer addDefaultHandlerForMethod:@"GET"
requestClass:[GCDWebServerRequest class]
asyncProcessBlock:^(GCDWebServerRequest* request, GCDWebServerCompletionBlock completionBlock) {
// Do some async operation like network access or file I/O (simulated here using dispatch_after())
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(3 * NSEC_PER_SEC)), dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
GCDWebServerDataResponse* response = [GCDWebServerDataResponse responseWithHTML:@"<html><body><p>Hello World</p></body></html>"];
completionBlock(response);
});
}];
(Advanced asynchronous version) The handler returns immediately a streamed HTTP response which itself generates its contents asynchronously:
[webServer addDefaultHandlerForMethod:@"GET"
requestClass:[GCDWebServerRequest class]
processBlock:^GCDWebServerResponse *(GCDWebServerRequest* request) {
NSMutableArray* contents = [NSMutableArray arrayWithObjects:@"<html><body><p>\n", @"Hello World!\n", @"</p></body></html>\n", nil]; // Fake data source we are reading from
GCDWebServerStreamedResponse* response = [GCDWebServerStreamedResponse responseWithContentType:@"text/html" asyncStreamBlock:^(GCDWebServerBodyReaderCompletionBlock completionBlock) {
// Simulate a delay reading from the fake data source
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(1 * NSEC_PER_SEC)), dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
NSString* string = contents.firstObject;
if (string) {
[contents removeObjectAtIndex:0];
completionBlock([string dataUsingEncoding:NSUTF8StringEncoding], nil); // Generate the 2nd part of the stream data
} else {
completionBlock([NSData data], nil); // Must pass an empty NSData to signal the end of the stream
}
});
}];
return response;
}];
Note that you can even combine both the asynchronous and advanced asynchronous versions to return asynchronously an asynchronous HTTP response!
When doing networking operations in iOS apps, you must handle carefully what happens when iOS puts the app in the background. Typically you must stop any network servers while the app is in the background and restart them when the app comes back to the foreground. This can become quite complex considering servers might have ongoing connections when they need to be stopped.
Fortunately, GCDWebServer does all of this automatically for you:
-stop
(this behavior can be disabled with the GCDWebServerOption_AutomaticallySuspendInBackground
option).-stop
(this behavior can be disabled with the GCDWebServerOption_AutomaticallySuspendInBackground
option).-start
.HTTP connections are often initiated in batches (or bursts), for instance when loading a web page with multiple resources. This makes it difficult to accurately detect when the very last HTTP connection has been closed: it's possible 2 consecutive HTTP connections part of the same batch would be separated by a small delay instead of overlapping. It would be bad for the client if GCDWebServer suspended itself right in between. The GCDWebServerOption_ConnectedStateCoalescingInterval
option solves this problem elegantly by forcing GCDWebServer to wait some extra delay before performing any action after the last HTTP connection has been closed, just in case a new HTTP connection is initiated within this delay.
Both for debugging and informational purpose, GCDWebServer logs messages extensively whenever something happens. Furthermore, when building GCDWebServer in "Debug" mode versus "Release" mode, it logs even more information but also performs a number of internal consistency checks. To enable this behavior, define the preprocessor constant DEBUG=1
when compiling GCDWebServer. In Xcode target settings, this can be done by adding DEBUG=1
to the build setting GCC_PREPROCESSOR_DEFINITIONS
when building in "Debug" configuration. Finally, you can also control the logging verbosity at run time by calling +[GCDWebServer setLogLevel:]
.
By default, all messages logged by GCDWebServer are sent to its built-in logging facility, which simply outputs to stderr
(assuming a terminal type device is connected). In order to better integrate with the rest of your app or because of the amount of information logged, you might want to use another logging facility.
GCDWebServer has automatic support for XLFacility (by the same author as GCDWebServer and also open-source): if it is in the same Xcode project, GCDWebServer should use it automatically instead of the built-in logging facility (see GCDWebServerPrivate.h for the implementation details).
It's also possible to use a custom logging facility - see GCDWebServer.h for more information.
Here's an example handler that redirects "/" to "/index.html" using the convenience method on GCDWebServerResponse
(it sets the HTTP status code and "Location" header automatically):
[self addHandlerForMethod:@"GET"
path:@"/"
requestClass:[GCDWebServerRequest class]
processBlock:^GCDWebServerResponse *(GCDWebServerRequest* request) {
return [GCDWebServerResponse responseWithRedirect:[NSURL URLWithString:@"index.html" relativeToURL:request.URL]
permanent:NO];
}];
To implement an HTTP form, you need a pair of handlers:
GCDWebServerRequest
class. The handler generates a response containing a simple HTML form.The POST handler expects the form values to be in the body of the HTTP request and percent-encoded. Fortunately, GCDWebServer provides the request class GCDWebServerURLEncodedFormRequest
which can automatically parse such bodies. The handler simply echoes back the value from the user submitted form.
[webServer addHandlerForMethod:@"GET"
path:@"/"
requestClass:[GCDWebServerRequest class]
processBlock:^GCDWebServerResponse *(GCDWebServerRequest* request) {
NSString* html = @" \
<html><body> \
<form name=\"input\" action=\"/\" method=\"post\" enctype=\"application/x-www-form-urlencoded\"> \
Value: <input type=\"text\" name=\"value\"> \
<input type=\"submit\" value=\"Submit\"> \
</form> \
</body></html> \
";
return [GCDWebServerDataResponse responseWithHTML:html];
}];
[webServer addHandlerForMethod:@"POST"
path:@"/"
requestClass:[GCDWebServerURLEncodedFormRequest class]
processBlock:^GCDWebServerResponse *(GCDWebServerRequest* request) {
NSString* value = [[(GCDWebServerURLEncodedFormRequest*)request arguments] objectForKey:@"value"];
NSString* html = [NSString stringWithFormat:@"<html><body><p>%@</p></body></html>", value];
return [GCDWebServerDataResponse responseWithHTML:html];
}];
GCDWebServer provides an extension to the GCDWebServerDataResponse
class that can return HTML content generated from a template and a set of variables (using the format %variable%
). It is a very basic template system and is really intended as a starting point to building more advanced template systems by subclassing GCDWebServerResponse
.
Assuming you have a website directory in your app containing HTML template files along with the corresponding CSS, scripts and images, it's pretty easy to turn it into a dynamic website:
// Get the path to the website directory
NSString* websitePath = [[NSBundle mainBundle] pathForResource:@"Website" ofType:nil];
// Add a default handler to serve static files (i.e. anything other than HTML files)
[self addGETHandlerForBasePath:@"/" directoryPath:websitePath indexFilename:nil cacheAge:3600 allowRangeRequests:YES];
// Add an override handler for all requests to "*.html" URLs to do the special HTML templatization
[self addHandlerForMethod:@"GET"
pathRegex:@"/.*\.html"
requestClass:[GCDWebServerRequest class]
processBlock:^GCDWebServerResponse *(GCDWebServerRequest* request) {
NSDictionary* variables = [NSDictionary dictionaryWithObjectsAndKeys:@"value", @"variable", nil];
return [GCDWebServerDataResponse responseWithHTMLTemplate:[websitePath stringByAppendingPathComponent:request.path]
variables:variables];
}];
// Add an override handler to redirect "/" URL to "/index.html"
[self addHandlerForMethod:@"GET"
path:@"/"
requestClass:[GCDWebServerRequest class]
processBlock:^GCDWebServerResponse *(GCDWebServerRequest* request) {
return [GCDWebServerResponse responseWithRedirect:[NSURL URLWithString:@"index.html" relativeToURL:request.URL]
permanent:NO];
];
GCDWebServer was originally written for the ComicFlow comic reader app for iPad. It allow users to connect to their iPad with their web browser over WiFi and then upload, download and organize comic files inside the app.
ComicFlow is entirely open-source and you can see how it uses GCDWebServer in the WebServer.h and WebServer.m files.