A Year With Symfony
A Year With Symfony
Writing healthy, reusable Symfony2 code
About the Book
I've written A Year With Symfony for you, a developer who will work with Symfony2 for more than a month (and probably more than a year). You may have started reading your way through the official documentation ("The Book"), the cookbook, some blogs, or an online tutorial. You know now how to create a Symfony2 application, with routing, controllers, entities or documents, Twig templates and maybe some unit tests. But after these basic steps, some concerns will raise about...
- The reusability of your code - How should you structure your code to make it reusable in a future project? Or even in the same project, but with a different view or in a console command?
- The quality of the internal API you have knowingly or unknowingly created - What can you do to ensure that your team members will understand your code, and will use it in the way it was meant to be used? How can you make your code flexible enough to be used in situations resembling the one you wrote it for?
- The level of security of your application - Symfony2 and Doctrine seem to automatically make you invulnerable for well-known attacks on your web application, like XSS, CSRF and SQL injection attacks. But can you completely rely on the framework? And what steps should you take to fix some of the remaining issues?
- The inner workings of Symfony2 - When you take one step further from creating just controllers and views, you will soon need to know more about the HttpKernel which is the heart of a Symfony2 application. How does it know what controller should be used, and which template? And how can you override any decision that's made while handling a request?
To get a better idea about the book, take a look at the table of contents below), or download a sample of the book above.
A printed edition of this book is available via Amazon.
- Thank you
- Who should read this book
- Overview of the contents
I The journey from request to response
1.1 Booting the kernel
- Bundles as container extensions
- Creating the service container
1.2 From the
- 1.1 Booting the kernel
2 Events leading to a response
2.1 Early response
- Some notable
- 2.2 Resolving the controller
2.3 Allow replacement of the controller
- Some notable
- 2.4 Collect arguments for executing the controller
- 2.5 Execute the controller
2.6 Enter the view layer
- A notable
2.7 Filter the response
- 2.1 Early response
3 Exception handling
- 3.1 Notable
- 4.1 When are sub-requests used?
- 1 The
II Patterns of dependency injection
- 5 What is a bundle?
6 Service patterns
6.1 Required dependencies
Required constructor arguments
- Abstract definitions for extra arguments
Required setter calls
- Method calls in abstract definitions
- Required constructor arguments
6.2 Optional dependencies
- Optional constructor arguments
- Optional setter calls
6.3 A collection of services
- Multiple method calls
- The best of both worlds
- Service tags
- Single method call
- Replacing a single argument
- Service ids instead of references
6.4 Delegated creation
- Not so useful
- Sometimes useful
6.5 Manually creating services
- 6.7 Dynamically add tags
- 6.8 Strategy pattern for loading exclusive services
6.9 Loading and configuring additional services
- A cleaner configuration class
- 6.10 Configure which services to use
- 6.11 Completely dynamic service definitions
- 6.1 Required dependencies
7 Parameter patterns
7.2 Parameter resolving
- Parameters for class names
- Manually resolving parameters
- 7.3 Define parameters in a container extension
- 7.4 Override parameters with a compiler pass
III Project structure
8 Organizing application layers
- 8.1 Slim controllers
- 8.2 Form handlers
- 8.3 Domain managers
- Persistence events
9 State and context
- 9.1 The security context
9.2 The request
Avoiding a dependency on the current request
- Use an event listener
- Providing the request object at runtime
- Using specific values only
- Avoiding a dependency on the current request
- 8 Organizing application layers
IV Configuration conventions
10 Application configuration setup
10.1 Use local configuration files
- 10.1 Use local configuration files
11 Configuration conventions
- Choosing Route Names
- 11.2 Services
- 11.3 Mapping metadata
- 11.1 Routing
- 10 Application configuration setup
- 12.1 Symfony and security
12.2 Goals: prevention and confinement
- Minimize impact
- Before diving in…
13 Authentication and sessions
13.1 Invalidating sessions
- Session hijacking
- Long-running sessions
- 13.1 Invalidating sessions
14 Controller design
- 14.1 Secure actions
- 14.2 Putting controllers behind the firewall
15 Input validation
15.1 Safe forms
- HTML5 validation
- Validation constraints
- Forms without an entity
15.2 Validate values from
- Route parameters
Query or request parameters
- Use the ParamFetcher
- Request attributes
15.3 Sanitizing HTML
- Automatic sanitizing
- 15.1 Safe forms
16 Output escaping
- Know your escaping context
- Escaping function output
- Escaping function arguments
Be wary of the
- 16.1 Twig
17 Being secretive
- 17.1 Mask authentication errors
- 17.2 Prevent exceptions from showing up
- 17.3 Customize error pages
- 17.4 Be vague about user data
- 12 Introduction
VI Using annotations
- Annotations: Domain-specific languages
19 An annotation is a simple value object
19.1 Adding attributes to your annotation
- Passing the attributes via the constructor
Populating public properties with the provided attributes
- Validation using
- 19.2 Limiting the use of an annotation
- 19.1 Adding attributes to your annotation
20 Valid use cases for annotations
20.1 Loading configuration
- Annotations and coupling
- 20.2 Controlling application flow
- 20.1 Loading configuration
21 Using annotations in your Symfony application
21.1 Responding to
21.2 Prevent controller execution: the
21.3 Modify the response: the
- 21.1 Responding to
- 22 Designing for reusability
- 23 Conclusion
- 18 Introduction
VII Being a Symfony developer
24 Reusable code has low coupling
- 24.1 Separate company and product code
- 24.2 Separate library and bundle code
24.3 Reduce coupling to the framework
- Event listeners over event subscribers
- Constructor arguments over fetching container parameters
Constructor arguments over fetching container services
- The performance issue
- Framework-agnostic controllers
- Thin commands
- The environment
25 Reusable code should be mobile
25.1 Dependency management and version control
- Package repositories
25.2 Hard-coded storage layer
- Auto-mapped entities
- Storage-agnostic models
- Object managers
25.3 Hard-coded filesystem references
- Using the filesystem
- 25.1 Dependency management and version control
26 Reusable code should be open for extension
- 26.1 Configurable behavior
26.2 Everything should be replaceable
Use lots of interfaces
- Use the bundle configuration to replace services
- Use lots of interfaces
26.3 Add extension points
- Service tags
27 Reusable code should be easy to use
- 27.1 Add documentation
27.2 Throw helpful exceptions
- Use specific exception classes
- Set detailed and friendly messages
28 Reusable code should be reliable
28.1 Add enough tests
- Test your bundle extension and configuration
- 28.1 Add enough tests
- 24 Reusable code has low coupling
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