from ExamplePage import ExamplePage
from MiscUtils.Funcs import uniqueId


class LoginPage(ExamplePage):
	"""A log-in screen for the example pages."""

	def title(self):
		return 'Log In'

	def htBodyArgs(self):
		return ExamplePage.htBodyArgs(self) + \
			' onload="document.loginform.username.focus();"' % locals()

	def writeContent(self):
		self.writeln('<div style="margin-left:auto;margin-right:auto;width:20em">'
			'<p>&nbsp;</p>')
		request = self.request()
		extra = request.field('extra', None)
		if not extra and request.isSessionExpired() and not request.hasField('logout'):
			extra = 'You have been automatically logged out due to inactivity.'
		if extra:
			self.writeln('<p style="color:#333399">%s</p>' % self.htmlEncode(extra))
		if self.session().hasValue('loginid'):
			loginid = self.session().value('loginid')
		else:
			# Create a "unique" login id and put it in the form as well as in the session.
			# Login will only be allowed if they match.
			loginid = uniqueId(self)
			self.session().setValue('loginid', loginid)
		action = request.field('action', '')
		if action:
			action = ' action="%s"' % action
		self.writeln('''<p>Please log in to view the example.
The username and password is <tt>alice</tt> or <tt>bob</tt>.</p>
<form method="post" name="loginform"%s>
<table cellpadding="4" cellspacing="4"
style="background-color:#CCCCEE;border:1px solid #3333CC;width:20em">
<tr><td align="right"><label for="username">Username:</label></td>
<td><input type="text" id="username" name="username" value="admin"></td></tr>
<tr><td align="right"><label for="password">Password:</label></td>
<td><input type="password" id="password" name="password" value=""></td></tr>
<tr><td colspan="2" align="right"><input type="submit" name="login" value="Login"></td></tr>
</table>
<input type="hidden" name="loginid" value="%s">''' % (action, loginid))
		# Forward any passed in values to the user's intended page after successful login,
		# except for the special values used by the login mechanism itself
		for name, value in request.fields().items():
			if name not in ('login', 'loginid', 'username', 'password', 'extra', 'logout'):
				if type(value) != type([]):
					value = [value]
				for v in value:
					self.writeln('''<input type="hidden" name="%s" value="%s">'''
						% (self.htmlEncode(name), self.htmlEncode(v)))
		self.writeln('</form>\n<p>&nbsp;</p></div>')
