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CHAPTER 11 MANAGING CUSTOMER DETAILS
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Modify the cart_details componentized template, which will now redirect the user to a checkout page that will be implemented in a new componentized template called checkout_info. Create a componentized template for customer login called customer_login. Create a componentized template for customer registration or for editing basic account details called customer_details. Create a componentized template named customer_credit_card that allows customers to enter credit card details. Create a componentized template named customer_address for customers to enter a shipping address.
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Creating customer and shipping_region Tables
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Now you can build the customer and shipping_region tables by following the steps in the next exercise.
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Exercise: Creating the Database Tables
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1. Load pgAdmin III, and connect to the hatshop database. 2. Click Tools Query tool (or click the SQL button on the toolbar). A new query window should appear. 3. Use the query tool to execute this code, which creates the shipping_region table in your hatshop database: -- Create shipping_region table CREATE TABLE shipping_region ( shipping_region_id SERIAL NOT NULL, shipping_region VARCHAR(100) NOT NULL, CONSTRAINT pk_shipping_region_id PRIMARY KEY (shipping_region_id) ); 4. Now add the values Please select , US / Canada , Europe , and Rest of the World to the shipping_region table. Please Select should always have a shipping_region_id value of 1 this is important! Execute the following SQL code using the query tool to add the mentioned values to the shipping_region table: -- Populate shipping_region table INSERT INTO shipping_region (shipping_region_id, shipping_region) VALUES (1, 'Please Select'); INSERT INTO shipping_region (shipping_region_id, shipping_region) VALUES (2, 'US / Canada'); INSERT INTO shipping_region (shipping_region_id, shipping_region) VALUES (3, 'Europe');
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CHAPTER 11 MANAGING CUSTOMER DETAILS
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INSERT INTO shipping_region (shipping_region_id, shipping_region) VALUES (4, 'Rest of World'); -- Update the sequence ALTER SEQUENCE shipping_region_shipping_region_id_seq RESTART WITH 5; 5. Use the query tool to execute this code, which creates the customer table in your hatshop database: -- Create customer table CREATE TABLE customer ( customer_id SERIAL NOT NULL, name VARCHAR(50) NOT NULL, email VARCHAR(100) NOT NULL, password VARCHAR(50) NOT NULL, credit_card TEXT, address_1 VARCHAR(100), address_2 VARCHAR(100), city VARCHAR(100), region VARCHAR(100), postal_code VARCHAR(100), country VARCHAR(100), shipping_region_id INTEGER NOT NULL DEFAULT 1, day_phone VARCHAR(100), eve_phone VARCHAR(100), mob_phone VARCHAR(100), CONSTRAINT pk_customer_id PRIMARY KEY (customer_id), CONSTRAINT fk_shipping_region_id FOREIGN KEY (shipping_region_id) REFERENCES shipping_region (shipping_region_id) ON UPDATE RESTRICT ON DELETE RESTRICT, CONSTRAINT uk_email UNIQUE (email) ); Customers credit card information will be stored in an encrypted format so that no one will be able to access this information. However, unlike with passwords, you need to be able to retrieve this credit card information when required by the order pipeline, so you can t simply use a hash (the hash algorithm is one-way). You ll implement the credit card data encryption functionality using a number of business tier classes, which you ll see next.
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Implementing the Security Classes
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So far, the following two areas need security functionality: Password hashing Credit card encryption
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CHAPTER 11 MANAGING CUSTOMER DETAILS
Both these tasks are carried out by business tier classes that you ll save in the business directory in the following files: password_hasher.php: Contains the PasswordHasher class, which contains the static method Hash() that returns the hash value for the password supplied. secure_card.php: Contains the SecureCard class, which represents a credit card. This class can be supplied with credit card information, which is then accessible in encrypted format. This class can also take encrypted credit card data and supply access to the decrypted information. symmetric_crypt.php: The class contained in this file, SymmetricCrypt, is used by SecureCard to encrypt and decrypt data. This means that if you ever want to change the encryption method, you only need to modify the code here, leaving the SecureCard class untouched. We ll look at the code for hashing first, followed by encryption.
Implementing Hashing Functionality in the Business Tier
Hashing is a means by which you can obtain a unique value that represents an object. The algorithm used to convert the source byte array into a hashed byte array varies. The most used hashing algorithm is called MD5 (Message Digest, another name for the hash code generated), which generates a 128-bit hash value. Unfortunately, many kinds of attacks are based on word dictionaries constructed against MD5 hashes. Another popular hashing algorithm is called SHA1 (Secure Hash Algorithm), which generates a 160-bit hash value. SHA1 is generally agreed to be more secure (although slower) than MD5. In the HatShop implementation, you ll use SHA1, although it is easy to change this if you require another type of security. Now, you ll implement the PasswordHasher class in the following exercise.
Note PHP doesn t come by default with support for mhash and mcrypt, the libraries we re using in this
chapter for hashing and encryption. See Appendix A to learn how to enable support for mhash and mcrypt.
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