Selenium gotcha – selenium.GetHtmlSource() returns processed HTML
Whilst writing some Selenium based acceptance tests today; I bumped into a hair pulling gotcha. Hopefully this post will prevent you from the same pain.
The test was to check whether some tracking tag javascript was being inserted into the page correctly or not.
I assumed that I could get the page source as it was being delivered to the browser by calling selenium.GetHtmlSource(); and then check that for the javascript string I was expected.
Unfortunately, GetHtmlSource is just a proxy for the browsers DOM.InnerHTML method; and that returns the Html after it has been preprocessed by the browser.
Turns out that preprocessing does a couple of funky things, including
- Changing line-endings (Firefox)
- Changing capitalization (IE6)
- Seemingly random removal / insertion of ” & ‘ (IE6)
So, when I was expecting a string like this:
1 2 3 4 5 6 | <script language="javascript" type="text/javascript"> <!-- var amPid = '206''; var amPPid = '4803'; if (document.location.protocol=='https:') ...[snip]... |
IE6 was presenting me with:
1 2 3 4 5 6 | <SCRIPT language=javascript type=text/javascript> <!-- var amPid = '206''; var amPPid = '4803'; if (document.location.protocol=='https:') ...[snip]... |
A possible solution is to ignore case, whitespace and quotes when doing the comparison, with a helper method like this:
1 2 3 4 5 6 7 8 9 10 11 12 13 | /// <summary> /// Use this to compare strings to those returned from selenium.GetHtmlSource for an Internet Explore instance /// (IE6 seems to change case and inclusion of quotes, especially for Javascript.?) /// </summary> /// <param name="expected"></param> /// <param name="actual"></param> private static void AssertStringContainsIgnoreCaseWhiteSpaceAndQuotes(string expected, string actual) { string expectedClean = Regex.Replace(expected, @"\s", "").ToLower().Replace("\"","").Replace("'",""); string actualClean = Regex.Replace(actual, @"\s", "").ToLower().Replace("\"", "").Replace("'", ""); StringAssert.Contains(expectedClean,actualClean, string.Format("Expected string \n\n{0} \n\nis not contained within \n\n{1}", expected, actual)); } |
It was the line endings that really floored me; because they were automatically normalized/corrected by my test runner when displaying the error. Aaargh!
Apache2 on Ubuntu 8.04LTS; restrict access to PAM authenticated users
I have a couple of static pages that I want to restrict access to.
I don’t want to manage another set of usernames & passwds, so I’d like apache2 to authenticate off the standard users on my system, via PAM.
To get this to work, you need to install and configure mod_auth_pam and mod_auth_shadow
aptitude install libapache2-mod-auth-pam libapache2-mod-auth-shadow
Ensure the www-data user is part of the shadow group, so apache2 can read the passwords
usermod -G shadow www-data
And set up the relevent virtual host:
AuthPAM_Enabled On AuthShadow on AuthPAM_FallThrough Off AuthBasicAuthoritative Off AuthType Basic AuthName "Restricted to group: sysadmins" AuthUserFile /dev/null Require group sysadmins
Restart apache, and you’re done!
Self Cert SSL certificate for Apache2 on Ubuntu 8.04LTS
Generate a self cert certificate:
https://help.ubuntu.com/8.04/serverguide/C/certificates-and-security.html
Create a new virtual host (you can only have one SSL virtual host / IP)
sudo cp /etc/apache2/sites-available/default /etc/apache2/sites-available/ssl
Edit ssl sothat it looks like this:
NameVirtualHost *:443
ServerName webangle-www1.everyangle.co.uk
ServerAdmin webmaster@localhost
DocumentRoot /var/www/
SSLEngine on
SSLOptions +StrictRequire
SSLCertificateFile /etc/ssl/certs/server.crt
SSLCertificateKeyFile /etc/ssl/private/server.key
Finally, if you want to force redirect of all traffic to a certain folder via SSL (e.g, /phpmyadmin), add the following to /etc/apache2/sites-available/default
#Redirect traffic to /phpmyadmin through https
RewriteEngine on
RewriteCond %{SERVER_PORT} ^80$
RewriteRule ^/phpmyadmin(.*)$ https://%{SERVER_NAME}/phpmyadmin$1 [L,R]
Enable it:
sudo a2ensite ssl sudo /etc/init.d/apache2 reload
Automount remote filesystem over SSH
Previously I posted on how I backup my server’s data to rsync.net’s remote storage.
A convienient way to access that remote storage is to configure rsync over sshfs:
sudo aptitude install sshfs mkdir /mnt/sshfs mkdir /mnt/sshfs/rsync.net sshfs **username**@ch-s011.rsync.net: /mnt/rsync.net
First, unmount
fusermount -u /mnt/rsync.net
Then, install autofs, and edit the config file
sudo aptitude install autofs sudo vi /etc/auto.master
Add the following line
/mnt/sshfs /etc/auto.sshfs --timeout=30,--ghost
Then,
sudo vi /etc/auto.sshfs
Add
rsync.net -fstype=fuse,rw,nodev,nonempty,noatime,allow_other,max_read=65536 :sshfs\#**username**@ch-s011.rsync.net\:
And finally restart autofs
sudo /etc/init.d/autofs restart
Now, when you cd /mnt/sshfs/rsync.net, after a short delay you will automatically be connected to the remote filesystem over SSH. After 30 seconds of inactivity, the connection will be closed.
Backup Ubuntu 8.04LTS to rsync.net using backup-manager (at linode.com)
I’m setting up a new linode360 VPS, based of the Ubuntu 8.04LTS image.
For backups, I want to do weekly backups and daily incrementals of the data files, and sync these off to an external backup location.
Broadly, there are two parts to the backup, creating the backed up files, and then copying them offsite.
Creating the backups
I’m using backup-manager 0.7.6-debian1, which handles backing up sets of files and MySQL databases to tar.gz files.
sudo aptitude install backup-manager sudo /usr/sbin/backup-manager --version
The comments in the config file make editing it quite straight forward.
sudo vi /etc/backup-manager.conf
One minor points:
- Separate multiple backup methods with a space, eg:
export BM_ARCHIVE_METHOD="tarball-incremental mysql"
To test:
sudo /usr/sbin/backup-manager --verbose
The output folder you specified (/var/archives) should now contain some .tar.gz versions of your data. Hurrah!
Getting the files offsite
Originally I intended to use Amazon’s S3 as a backup store, following Michael Zehrer’s instructions on how to rsync with S3. However, I couldn’t get this to work reliably; so I opted instead for rsync.net which offers standard scp, ftp, WebDav and sshfs access to their geographic backup locations.
Backup-manager can rsync over ssh, which is a quick and efficient way to sync changes over to the remote host..
The first step is get your rsync.net account setup; and set up your ssh so you can access without typing in a password
Then, set the BM_UPLOAD_METHOD to rsync, and configure both the scp and the rsync settings in /etc/backup-manager.conf (pay attention not to prefix remote folders with / ).
Test with:
sudo /usr/sbin/backup-manager --verbose
Once its all working, set up a cron job to call backup-manager daily.
crontab -e
I run backup-manager once per day in the wee hours, and log output to /root/crontab/daily_backup-manager.logs
0 3 * * * /usr/sbin/backup-manager -v > /root/cronlogs/daily_backup-manager.log
Viola!
Farside re-enactment group
The evolution of the giraffe.
In case you were wondering. More sidesplitting stuff at http://www.flickr.com/groups/farside/pool/
