JLRoutes

What is it?

JLRoutes is a URL routing library with a simple block-based API. It is designed to make it very easy to handle complex URL schemes in your application with minimal code.

More information on how to register custom URL schemes in your application's Info.plist.

Installation

JLRoutes is available for installation using CocoaPods or Carthage (add github "joeldev/JLRoutes" to your Cartfile).

Requirements

iOS 7.0+ or OS X 10.9+

Simple Example

// in your app delegate:

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
  // ...
  [[JLRoutes globalRoutes] addRoute:@"/user/view/:userID" handler:^BOOL(NSDictionary *parameters) {
    NSString *userID = parameters[@"userID"]; // defined in the route by specifying ":userID"
    // present UI for viewing user with ID 'userID'
    return YES; // return YES to say we have handled the route
  }];
  // ...
  return YES;
}

- (BOOL)application:(UIApplication *)app openURL:(NSURL *)url options:(NSDictionary<NSString *, id> *)options
{
  return [JLRoutes routeURL:url];
}

After having set that route up, at any point something (including a different application) could call this to fire the handler block:

NSURL *viewUserURL = [NSURL URLWithString:@"myapp://user/view/joeldev"];
[[UIApplication sharedApplication] openURL:viewUserURL];

In this example, the userID object in the parameters dictionary passed to the block would have the key/value pair "userID": "joeldev", which could then be used to present a UI or do whatever else is needed.

The Parameters Dictionary

The parameters dictionary always contains at least the following three keys:

{
  "JLRouteURL":  "(the NSURL that caused this block to be fired)",
  "JLRoutePattern": "(the actual route pattern string)",
  "JLRouteScheme": "(the route scheme, defaults to JLRoutesGlobalRoutesScheme)"
}

The JLRouteScheme key refers to the scheme that the matched route lives in. Read more about schemes.

See JLRoutes.h for the list of constants.

Handler Block

As you may have noticed, the handler block is expected to return a boolean for if it has handled the route or not. If the block returns NO, JLRoutes will behave as if that route is not a match and it will continue looking for a match. A route is considered to be a match if the pattern string matches and the block returns YES.

It is also important to note that if you pass nil for the handler block, an internal handler block will be created that simply returns YES.

More Complex Example

[[JLRoutes globalRoutes] addRoute:@"/:object/:action/:primaryKey" handler:^BOOL(NSDictionary *parameters) {
  NSString *object = parameters[@"object"];
  NSString *action = parameters[@"action"];
  NSString *primaryKey = parameters[@"primaryKey"];
  // stuff
  return YES;
}];

This route would match things like /user/view/joeldev or /post/edit/123. Let's say you called /post/edit/123 with some URL params as well:

NSURL *editPost = [NSURL URLWithString:@"myapp://post/edit/123?debug=true&foo=bar"];
[[UIApplication sharedApplication] openURL:editPost];

The parameters dictionary that the handler block receives would contain the following key/value pairs:

{
  "object": "post",
  "action": "edit",
  "primaryKey": "123",
  "debug": "true",
  "foo": "bar",
  "JLRouteURL": "myapp://post/edit/123?debug=true&foo=bar",
  "JLRoutePattern": "/:object/:action/:primaryKey",
  "JLRouteScheme": "JLRoutesGlobalRoutesScheme"
}

Schemes

JLRoutes supports setting up routes within a specific URL scheme. Routes that are set up within a scheme can only be matched by URLs that use a matching URL scheme. By default, all routes go into the global scheme.

[[JLRoutes globalRoutes] addRoute:@"/foo" handler:^BOOL(NSDictionary *parameters) {
  // This block is called if the scheme is not 'thing' or 'stuff' (see below)
  return YES;
}];

[[JLRoutes routesForScheme:@"thing"] addRoute:@"/foo" handler:^BOOL(NSDictionary *parameters) {
  // This block is called for thing://foo
  return YES;
}];

[[JLRoutes routesForScheme:@"stuff"] addRoute:@"/foo" handler:^BOOL(NSDictionary *parameters) {
  // This block is called for stuff://foo
  return YES;
}];

This example shows that you can declare the same routes in different schemes and handle them with different callbacks on a per-scheme basis.

Continuing with this example, if you were to add the following route:

[[JLRoutes globalRoutes] addRoute:@"/global" handler:^BOOL(NSDictionary *parameters) {
  return YES;
}];

and then try to route the URL thing://global, it would not match because that route has not been declared within the thing scheme but has instead been declared within the global scheme (which we'll assume is how the developer wants it). However, you can easily change this behavior by setting the following property to YES:

[JLRoutes routesForScheme:@"thing"].shouldFallbackToGlobalRoutes = YES;

This tells JLRoutes that if a URL cannot be routed within the thing scheme (aka, it starts with thing: but no appropriate route can be found), try to recover by looking for a matching route in the global routes scheme as well. After setting that property to YES, the URL thing://global would be routed to the /global block.

Wildcard routes

JLRoutes supports setting up routes that will match an arbitrary number of path components at the end of the routed URL. An array containing the additional path components will be added to the parameters dictionary with the key JLRouteWildcardComponentsKey.

For example, the following route would be triggered for any URL that started with /wildcard/, but would be rejected by the handler if the next component wasn't joker.

[[JLRoutes globalRoutes] addRoute:@"/wildcard/*" handler:^BOOL(NSDictionary *parameters) {
  NSArray *pathComponents = parameters[JLRouteWildcardComponentsKey];
  if ([pathComponents count] > 0 && [pathComponents[0] isEqualToString:@"joker"]) {
    // the route matched; do stuff
    return YES;
  }

  // not interested unless the joker's in it
  return NO;
}];

Optional routes

JLRoutes supports setting up routes with optional parameters. At the route registration moment, JLRoute will register multiple routes with all combinations of the route with the optional parameters and without the optional parameters. For example, for the route /the(/foo/:a)(/bar/:b), it will register the following routes:

/the/foo/:a/bar/:b
/the/foo/:a
/the/bar/:b
/the

License

BSD 3-Clause License:

Copyright (c) 2016, Joel Levin. All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.

Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
Neither the name of JLRoutes nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

MarkStray/JLRoutes