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Blazor Authentication Continued

Previously I posted a note on Blazor authentication and how my approach worked great. As it turns out, I think that approach was wrong and it left me at a deadend. So I thought it would be worth going deeper into what I am trying to do, and how I think my new approach will work better.

When I first design the layout and pattern for my Blazor application, I thought it was pretty straightforward. I wanted a login status bar at the top of the page showing the current logged in user, or if no usr is logged in a login button. I put my loginbar control directly in the main layout page to keep all my other pages from having to deal with it.

The problem occurred when I built a user dashboard page that I wanted to function where when that page is requested, and no one is logged in, it pops open a modal form (using Blazored Modal) and prompts the user to login. After messing with it a bit, I could get the user dashboard page to refresh after login, but could not get the login bar to update when the user logs in via this method.

After much googling and tinkering, I finally decided to deal with creating custom events to notify the controls of a login. I had been avoiding this – after working with javascript events I swore off dealing with that level of complexity on the front end. But after reading the docs, it appeared that this will be a useful tool for any Blazor project. I was really getting stymied until I stumbled upon Jason Watmore’s example on Github. That is a nice simple example of communicating between components.

I was able to adapt the example to my scenario, and it turns out to be a nice simple solution. Here is how it works. I created a ‘OnLoginComplete’ event which my login form fires when there is a successful login. I added a listener for this event to the loginbar and my userdashboard page, so when the event is fired these components wake up and refresh themselves, and reflect the username and other data important to the logged in user. Once I got the hang of it, it was quite simple.

I thought about creating an ‘OnLogout’ event, but it turns out I don’t need it. For now the only place I have a logout button is in the loginbar at the top of the page, and when that is clicked I destroy the credentials and redirect back to the home page.

After many attempts I feel like I have the right solution, and I think firing and listening for events will be handy for future projects. I took a lot of wrong turns in arriving at this solution.. but then isn’t that part of the fun of learning new languages?

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December 9, 2020 Dan Leave a comment

Is Amazon over-over valued?

Amazon is a tough stock for a value investor like me to own – it has always been overvalued.  Yet it has been a great stock for years – up over 10 times over 10 years.  It currently is a $270 stock, with a negative 12 months earnings.  Compare that to Google – $800 stock with $32 in annual earnings, or even a Costco – a $100 stock with $4 in trailing 12 month earnings.

I decided to run some comparisons of Amazon with Costco – somewhat similar retail presence, leaders in their field, and likely to thrive in the new internet-centric economy. First, take a look at this earnings yield comparison:

amznearningsyield

It doesnt alarm me that their earnings yield has gone negative – Amazon has always been running on tight margins, investing in growth.  They are pumping lots of money into new distribution centers in many states to allow for quicker and cheaper shipping to more destinations.   However the 18 month trend of shrinking yield – caused largely by the stock price runup, has me a little worried – and when compared to a solid company like Costco, they have a lot of ground to make up.

The other chart that bothers me a little more is the revenue growth chart:

amzncostrev

Revenue growth has been shrinking – perhaps the new distribution centers will help, but you have to wonder if the glory days of Amazon’s growth is behind it.  The market certainly doesn’t think so – during this time Amazon has quadrupled:

amznprice
Amazon Stock Price Feb 2008 – Feb 2013

As much as I like Amazon the company and its future prospects, at this point I think I can find better long term value in the stock market.  Its tough to bet against this stock – its always proven doubters wrong, but maybe this time its time to get out.

February 22, 2013 Dan 1 Comment

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