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3.1.3 Users, privileges, and group blogs
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A typical blog server controls user access to blog data by assigning each user a different set of privileges. Here are the common types of user privileges:
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Reader A reader is allowed to read one or more blogs. Most blogs are configured so that anybody, including anonymous visitors, can read, but some blogs allow only registered users with reader privilege to do so. For example, if you are setting up a family blog, you might wish to restrict access to family members only. Commenter A commenter is allowed to add comments to blog entries on one or more blogs. Most blogs are configured so that anybody can leave comments, but some blogs allow only registered users with commenter privilege to do so. Now that unscrupulous advertisers are spamming blog comments, you will see more and more blogs that allow only registered users to post comments. Editor An editor is allowed to create, edit, and publish blog entries on one or more blogs. Some blog servers support a concept called workflow, whereby any blog author can create new blog entries, but only editors can approve blog entries for publication on the Web. This is an important
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feature for corporate news blogs, some of which require management approval of all new blog posts.
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Author In a blog server that supports workflow, an author is a user who is allowed to create blog entries on one or more blogs but not to publish them. An author may or may not be able to create and modify categories, page templates, bookmarks, and resources. Administrator An administrator is allowed to edit blog settings categories, page templates, bookmarks, and resources.
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Different blog servers have different levels of support for users and privileges, with the most limited allowing only one user per blog, and most capable of allowing each user to have multiple blogs and group blogs, blogs with more than one user. If your blog server does not support group blogs, you can approximate one by using an aggregator, as described in chapter 12. Now that we understand how data is stored in a blog server, let s move on to architecture.
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3.1.4 Blog server architecture
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To develop a simple blog or wiki server, all you need is a place to store data and a transformer to turn that data into HTML for web browsers and into XML for newsfeed readers. This basic architecture, shown in figure 3.3, is so simple that it s possible to develop a useful blog or wiki sever with only a single page of code. Some developers have done just that. For example, Rael Dornfest s popular Bloxsom blog software was originally implemented in only 61 lines of Perl code. But those core components are not enough for a full-featured multiuser blog server. Users want a friendly user interface for blogging, uploading files, and managing the server. Developers want a plug-in architecture so they can customize the system and a web services interface so they can write programs that
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Core components of blog server architecture
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Anatomy of a blog server
Architecture of a typical blog server
blog. IT managers want a system that can scale to handle an increasing number of users and visitors. To meet those additional requirements, most blog servers use a multitiered design, as shown in figure 3.4. Let s discuss each of the tiers of blog server architecture shown in figure 3.4. Data tier The data tier is responsible for storing the entities and relationships we covered in the previous section. These entities could be stored as records in a relational database, such as Oracle or MySQL, as files in a filesystem, or a combination of both. For example, some blog servers store blog entries in a relational database, but they store any uploaded files in a filesystem. When shopping for a blog or wiki server, you will probably have to choose between using a relational database or a filesystem for storage. If you are setting up a server for a small group and you just want to avoid the overhead of installing a relational database system, you should consider a filesystem-based blog server. If you are setting up a large multiuser installation and you may eventually need to use clustering, or if you simply prefer storing your data in a database, you should consider a relational database-based blog server. Web tier The web tier is responsible for transforming blog data into HTML and XML representations, providing a user interface for both blog authors and blog readers, and for supporting a web services interface for blog clients. The web tier is made up of a number of components:
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