1 XML Processing and Web Services Chapter 17 Textbook to be published by Pearson Ed 2015 in early Pearson 2014 Fundamentals of Web Development
2 Objectives 1 XML Overview 2 XML Processing 3 JSON 4 Overview of Web Services 5 Consuming Web Services in PHP 6 Creating Web Services 7 Asynchronous Web Services
3 Section 1 of 7 XML OVERVIEW
4 XML Overview XML is a markup language, but unlike HTML, XML can be used to mark up any type of data. One of the key benefits of XML data is that as plain text, it can be read and transferred between applications and different operating systems as well as being human-readable and understandable as well. XML is not only used on the web server and to communicate asynchronously with the browser, but is also used as a data interchange format for moving information between systems
5 XML Overview Used in many systems
6 Well Formed XML For a document to be well-formed XML, it must follow the syntax rules for XML: Element names are composed of any of the valid characters (most punctuation symbols and spaces are not allowed) in XML. Element names can t start with a number. There must be a single-root element. A root element is one that contains all the other elements; for instance, in an HTML document, the root element is <html>. All elements must have a closing element (or be self-closing). Elements must be properly nested. Elements can contain attributes. Attribute values must always be within quotes. Element and attribute names are case sensitive.
7 Well Formed XML Sample Document
8 Valid XML Requires a DTD A valid XML document is one that is well formed and whose element and content conform to the rules of either its document type definition (DTD) or its schema. A DTD tells the XML parser which elements and attributes to expect in the document as well as the order and nesting of those elements. A DTD can be defined within an XML document or within an external file.
9 Data Type Definition Example
10 Data Type Definition Example The main drawback with DTDs is that they can only validate the existence and ordering of elements. They provide no way to validate the values of attributes or the textual content of elements. For this type of validation, one must instead use XML schemas, which have the added advantage of using XML syntax. Unfortunately, schemas have the corresponding disadvantage of being long-winded and harder for humans to read and comprehend; for this reason, they are typically created with tools.
11 XML Schema Just one example
12 XSLT XML Stylesheet Transformations XSLT is an XML-based programming language that is used for transforming XML into other document formats
14 XSLT Example XSLT document that converts the XML from Listing 17.1 into an HTML list
15 XSLT An XML parser is still needed to perform the actual transformation
16 XPath Another XML Technology XPath is a standardized syntax for searching an XML document and for navigating to elements within the XML document XPath is typically used as part of the programmatic manipulation of an XML document in PHP and other languages XPath uses a syntax that is similar to the one used in most operating systems to access directories.
17 XPath Learn through example
18 Section 2 of 7 XML PROCESSING
21 XML Processing
22 XML Processing With JQuery
23 XML Processing With PHP PHP provides several extensions or APIs for working with XML including: The SimpleXML extension which loads the data into an object that allows the developer to access the data via array properties and modifying the data via methods. The XMLReader is a read-only pull-type extension that uses a cursor-like approach similar to that used with database processing
24 XML Processing With PHP using Simple XML Variable and attribute names taken from xml
25 XML Processing With PHP using Simple XML and XPath
26 XML Processing With PHP using XMLReader Less automatic More Verbose
27 XML Processing Why choose when you can use both
28 Section 3 of 7 JSON
30 JSON An example XML object in JSON
31 JSON An example XML object in JSON
34 Using JSON in PHP JSON on the server Converting a JSON string into a PHP object is quite straightforward: Notice that the json_decode() function can return either a PHP object or anassociative array.
35 Using JSON in PHP Go the other way To go the other direction (i.e., to convert a PHP object into a JSON string), youan use the json_encode() function.
36 Using JSON in PHP JSON on the server Since JSON data is often coming from an external source, always check for parse errors before using it, via the json_last_error() function:
37 Section 4 of 7 OVERVIEW OF WEB SERVICES
38 Web Services An overview Web services are the most common example of a computing paradigm commonly referred to as serviceoriented computing (SOC). A service is a piece of software with a platformindependent interface that can be dynamically located and invoked. Web services are a relatively standardized mechanism by which one software application can connect to and communicate with another software application using web protocols.
39 Web Services Benefits they potentially provide interoperability between different software applications running on different platforms they can be used to implement something called a service-oriented architecture (SOA) they can be offered by different systems within an organization as well as by different organizations
40 Web Services Visual Overview
41 Web Services SOAP Services SOAP is the message protocol used to encode the service invocations and their return values via XML within the HTTP header. SOAP and WSDL are complex XML schemas akin to using a compiler: its output may be complicated to understand the enthusiasm for SOAP-based web services had cooled.
42 Web Services SOAP Services
43 Web Services REST Services REST stands for Representational State Transfer. RESTful web service does away with the service description layer, and needs no separate protocol for encoding message requests and responses. It simply uses HTTP URLs for requesting a resource/object (and for encoding input parameters). The serialized representation of this object, usually an XML or JSON stream, is then returned to the requestor as a normal HTTP response. REST appears to have almost completely displaced SOAP services.
44 Web Services REST Services
45 An Example Web Service We will only use REST from here on in Consider the Google Geocoding API. The Google Geocoding API provides a way to perform geocoding operations via an HTTP GET request, and thus is an especially useful example of a RESTful web service. Geocoding typically refers to the process of turning a real-world address into geographic coordinates, which are usually latitude and longitude values Reverse geocoding is the process of converting geographic coordinates into a human-readable address.
46 An Example Web Service Mashups abound with web services From trendsmap.com
47 An Example Web Service More details In this case the request will take the following form: An example geocode request would look like the following: ritish%20museum,+great+russell+street,+london,+wc1b+3dg &sensor=false From trendsmap.com
48 An Example Web Service The Response The response is a standard HTTP response with headers This response is XML The lat/lng is in there somewhere
49 Identifying and Authenticating Service Requests Most web services are not open. Instead they typically employ one of the following techniques: Identity. Each web service request must identify who is making the request. Authentication. Each web service request must provide additional evidence that they are who they say they are.
50 Identity examples Real World ways of limiting service Web services that make use of an API key typically require the user (i.e., the developer) to register online with the service for an API key. This API key is then added to the GET request as a query string parameter. For instance, to request to the Microsoft Bing Maps web service will look like the following : =British%20Museum,+Great+Russell+Street,+London,+WC1 B+3DG,+UK&key=[BING API KEY HERE]
51 Identity examples Real World ways of limiting service Web services that make use of an API key typically require the user (i.e., the developer) to register online with the service for an API key. This API key is then added to the GET request as a query string parameter. For instance, to request to the Microsoft Bing Maps web service will look like the following : =British%20Museum,+Great+Russell+Street,+London,+WC1 B+3DG,+UK&key=[BING API KEY HERE]
52 Authentication Real World ways of limiting service Some web services are providing private/proprietary information or are involving financial transactions. In this case, these services not only may require an API key, but they also require some type of user name and password in order to perform an authorization. Many of the most well-known web services instead make use of the OAuth standard.
53 Section 5 of 7 CONSUMING WEB SERVICES IN PHP
54 Consuming Web Services in PHP There are three usual approaches in PHP for making a REST request: Using the file_get_contents() function. Using functions contained within the curl library. Using a custom library for the specific web service. Many of the most popular web services have free and proprietary PHP libraries available.
55 Consuming Web Services in PHP The file_get_contents() function is simple but doesn t allow POST requests Services that require authentication will have to use the curl extension library, which allows significantly more control over requests. You may need to configure your server to include curl support.
56 A Flickr Example The Flickr web service provides a photo search service. The basic format for this service method is: &api_key=[enter your flickr api key here]&tags=[search values here]&format=rest The service will return its standard XML photo list
57 A Flickr Example Some Code using file_get_contents() $request = constructflickrsearchrequest('athens'); $response = file_get_contents($request);
58 A Flickr Example Use file get contents
59 A Flickr Example Use curl (and actually do something) Make the request Parse the XML
60 A Flickr Example What that last code actually built
61 Consuming JSON Services Consuming a JSON web service requires almost the same type of PHP coding as consuming an XML web service. But rather than using SimpleXML to extract the information one needs, one instead uses the json_decode() function.
62 Consuming JSON Services Combine 2 services (using JSON) To extract the latitude and longitude from the JSON string returned from the mapping web service, you would need code similar to the following: Once our program has retrieved the latitude and longitude, the program then will use the GeoNames web service s. This request will take the following form: ng= &username=your-username-here
63 Consuming JSON Services A complicated example with 2 services
64 Consuming JSON Services More examples
65 Consuming JSON Services More examples
66 Section 6 of 7 CREATING WEB SERVICES
68 Creating an XML Service Web Service, that is The first service we will create will be one that returns data from our Book Customer Relations Management database. To begin, we should determine the methods our service will support and the format of the requests. crmservicesearchbooks.php?criteria=yyy&look=zzz The criteria parameter will be used to specify what type of criteria we will use for the book search. This exercise will only support four values: imprint, category, look, and subcategory. The look parameter will be used to specify the actual value to search.
69 Creating an XML Service Web Service, that is For instance, if we had the following request: crmservicesearchbooks.php?criteria=subcategory&look=financ e It would be equivalent to the SQL search: SELECT * FROM Books WHERE SubCategoryID=5
70 Creating an XML Service Sample XML output
71 Creating an XML Service Sample XML output
72 Creating an XML Service Code details left as an exercise There are different ways to output XML in PHP. One approach would be to simply echo XML within string literals to the response stream: echo '<?xml version="1.0" encoding="utf-8"?> ; echo '<books>';... While this approach has the merit of familiarity, it will be up to the programmer to ensure that our page outputs well-formed and valid XML. The alternate approach would be to use one of PHP s XML extensions such as the XMLWriter object.
73 Creating an JSON Service Web Service Creating a JSON web service rather than an XML service is simply a matter of creating a JSON representation of an object setting the Content-type header to indicate the content will be JSON, and then outputting the JSON object Since the built-in PHP json_encode() function does most of the work for us, our JSON service is simpler than the XML web service from the last section
74 Creating an JSON Service Web Service Output headers Function to create JSON From the Database, based on query
75 Creating an JSON Service Web Service For this function to work, the class of the custom object being converted must provide its own implementation of the JsonSerializable interface. T his interface contains only the single method jsonserialize(). In this web service, we are outputting JSON for objects of the Book class, so this class will need to implement this method
76 Creating an JSON Service Web Service
77 Creating an JSON Service Testing our service in the browser
78 Section 7 of 7 INTERACTING ASYNCHRONOUSLY WITH WEB SERVICES
80 Consuming your own service Autocomplete example
81 Consuming your own service Autocomplete example The code listens for changes to an input box with id search. With each change the code makes an asynchronous get request to the source URL, which in this case is the script in Listing that returns JSON results. Those results are then used by autocomplete to display nicely underneath the input box.
83 Using Google Maps A popular mashup platform
84 Using Google Maps Under the hood there are lots of asynchronous requests
85 Using Google Maps A sample mashup
86 What You ve Learned 1 XML Overview 2 XML Processing 3 JSON 4 Overview of Web Services 5 Consuming Web Services in PHP 6 Creating Web Services 7 Asynchronous Web Services
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