4367 (exercise[repeat])

import java.lang.Math;
class a0311b_cross {
	public static void main (String[] args) {
		double l1x1in,l1x2in,l1y1in,l1y2in,l2x1in,l2x2in,l2y1in,l2y2in,l1x1,l1x2,l1y1,l1y2,l2x1,l2x2,l2y1,l2y2,a,b,c,d,xs,ys;
		boolean parallel, deckung, crossed;
		int fall;
		l1x1in = 0;
		l1x2in = 0;
		l1y1in = 0;
		l1y2in = 0;
		l2x1in = 0;
		l2x2in = 0;
		l2y1in = 0;
		l2y2in = 0;
		l1x1 = 0;
		l1x2 = 0;
		l1y1 = 0;
		l1y2 = 0;
		l2x1 = 0;
		l2x2 = 0;
		l2y1 = 0;
		l2y2 = 0;
		a = 0;
		b = 0;
		c = 0;
		d = 0;
		xs = 0;
		ys = 0;
		parallel = false;
		deckung = false;
		crossed = false;
		fall = 0;

		l1x1in = eingabe.readDouble ("Linie 1, x1:");
		l1y1in = eingabe.readDouble ("Linie 1, y1:");
		l1x2in = eingabe.readDouble ("Linie 1, x2:");
		l1y2in = eingabe.readDouble ("Linie 1, y2:");
		l2x1in = eingabe.readDouble ("Linie 2, x1:");
		l2y1in = eingabe.readDouble ("Linie 2, y1:");
		l2x2in = eingabe.readDouble ("Linie 2, x2:");
		l2y2in = eingabe.readDouble ("Linie 2, y2:");
		//l1, bottom to top
		if ((l1x1in == l1x2in) && (l1y1in < l1y2in))
			{
			l1x1 = l1x1in;
			l1x2 = l1x2in;
			l1y1 = l1y1in;
			l1y2 = l1y2in;
			}
		//l1, top to bottom
		if ((l1x1in == l2x1in) && (l1y1in > l1y2in))
			{
			l1x1 = l1x2in;
			l1y1 = l1y2in;
			l1x2 = l1x1in;
			l1y2 = l1y1in;
			}
		//l1, left to right
		if ((l1x1in < l1x2in) && (l1y2in == l1y2in))
			{
			l1x1 = l1x1in;
			l1x2 = l1x2in;
			l1y1 = l1y1in;
			l1y2 = l1y2in;
			}
		//l1, right to left
		if ((l1x1in > l1x2in) && (l1y1in == l1y2in))
			{
			l1x1 = l1x2in;
			l1y1 = l1y2in;
			l1x2 = l1x1in;
			l1y2 = l1y1in;
			}
		//l1, bottom left to top right
		if ((l1x1in < l1x2in) && (l1y1in < l1y2in))
			{
			l1x1 = l1x1in;
			l1x2 = l1x2in;
			l1y1 = l1y1in;
			l1y2 = l1y2in;
			}
		//l1, top right to bottom left
		if ((l1x1in > l1x2in) && (l1y1in > l1y2in))
			{
			l1x1 = l1x2in;
			l1y1 = l1y2in;
			l1x2 = l1x1in;
			l1y2 = l1y2in;
			}
		//l1, top left to bottom right
		if ((l1x1in < l1x2in) && (l1y1in > l1y2in))
			{
			l1x1 = l1x1in;
			l1x2 = l1x2in;
			l1y1 = l1y1in;
			l1y2 = l1y2in;
			}
		//l1, bottom right to top left
		if ((l1x1in > l1x2in) && (l1y1in < l1y2in))
			{
			l1x1 = l1x2in;
			l1y1 = l1y2in;
			l1x2 = l1x1in;
			l1y2 = l1y1in;
			}
		//l2, bottom to top
		if ((l2x1in == l2x2in) && (l2y1in < l2y2in))
			{
			l2x1 = l2x1in;
			l2x2 = l2x2in;
			l2y1 = l2y1in;
			l2y2 = l2y2in;
			}
		//l2, top to bottom
		if ((l2x1in == l2x2in) && (l2y1in > l2y2in))
			{
			l2x1 = l2x2in;
			l2y1 = l2y2in;
			l2x2 = l2x1in;
			l2y2 = l2y1in;
			}
		//l2, left to right
		if (( l2x1in < l2x2in) && (l2y1in == l2y2in))
			{
			l2x1 = l2x1in;
			l2x2 = l2x2in;
			l2y1 = l2y1in;
			l2y2 = l2y2in;
			}
		//l2, right to left
		if ((l2x1in > l2x2in) && (l2y1in == l2y2in))
			{
			l2x1 = l2x2in;
			l2y1 = l2y2in;
			l2x2 = l2x1in;
			l2y2 = l2y1in;
			}
		//l2, bottom left to top right
		if ((l2x1in < l2x2in) && (l2y1in < l2y2in))
			{
			l2x1 = l2x1in;
			l2x2 = l2x2in;
			l2y1 = l2y1in;
			l2y2 = l2y2in;
			}
		//l2, top right to bottom left
		if ((l2x1in > l2x2in) && (l2y1in > l2y2in))
			{
			l2x1 = l2x2in;
			l2y1 = l2y2in;
			l2x2 = l2x1in;
			l2y2 = l2y1in;
			}
		//l2, top left to bottom right
		if ((l2x1in < l2x2in) && (l2y1in > l2y2in))
			{
			l2x1 = l2x1in;
			l2x2 = l2x2in;
			l2y1 = l2y1in;
			l2y2 = l2y2in;
			}
		//l2, bottom right to top left
		if ((l2x1in > l2x2in) && (l2y1in < l2y2in))
			{
			l2x1 = l2x2in;
			l2y1 = l2y2in;
			l2x2 = l2x1in;
			l2y2 = l2y1in;
			}
		// | * | 1
		if ((l1x1 == l1x2) && (l2x1 == l2x2)) { fall = 1; }
		// | * - 2
		else if ((l1x1 == l1x2) && (l2y1 == l2y2)) { fall = 2; }
		// | * / 3
		else if ((l1x1 == l1x2) && (l2y1 < l2y2)) { fall = 3; }
		// | * \ 4
		else if ((l1x1 == l1x2) && (l2y1 > l2y2)) { fall = 4; }
		// - * | 5
		else if ((l1y1 == l1y2) && (l2x1 == l2x2)) { fall = 5; }
		// - * - 6
		else if ((l1y1 == l1y2) && (l2y1 == l2y2)) { fall = 6; }
		// - * / 7
		else if ((l1y1 == l1y2) && (l2y1 < l2y2)) { fall = 7; }
		// - * \ 8
		else if ((l1y1 == l1y2) && (l2y1 > l2y2)) { fall = 8; }
		// / * | 9
		else if ((l1y1 < l1y2) && (l2x1 == l2x2)) { fall = 9; }
		// / * - 10
		else if ((l1y1 < l1y2) && (l2y1 == l2y2)) { fall = 10; }
		// / * / 11
		else if ((l1y1 < l1y2) && (l2y1 < l2y2)) { fall = 11; }
		// / * \ 12
		else if ((l1y1 < l1y2) && (l2y1 > l2y2)) { fall = 12; }
		// \ * | 13
		else if ((l1y1 > l1y2) && (l2x1 == l2x2)) { fall = 13; }
		// \ * - 14
		else if ((l1y1 > l1y2) && (l2y1 == l2y2)) { fall = 14; }
		// \ * / 15
		else if ((l1y1 > l1y2) && (l2y1 < l2y2)) { fall = 15; }
		// \ * \ 16
		else if ((l1y1 > l1y2) && (l2y1 > l2y2)) { fall = 16; }

		switch (fall)
			{
			// hv * vh 1,2,5,6
			case 1: case 2: case 5: case 6:
				{
				//no content neccessary by purpose
				break;
				}
			// | * x 3,4
			case 3: case 4:
				{
				c = (l2y2 - l2y1) / (l2x2 - l2x1);
				d = l2y1 - (c * l2x1);
				xs = l1x1;
				ys = (c * xs) + d;
				break;
				}
			// x * | 9,13
			case 9: case 13:
				{
				a = (l1y2 - l1y1) / (l1x2 - l1x1);
				b = l1y1 - (a * l1x1);
				xs = l2x1;
				ys = (a * xs) + b;
				break;
				}
			case 7: case 8: case 10: case 11: case 12: case 14: case 15: case 16:
				{
				a = (l1y2 - l1y1) / (l1x2 - l1x1);
				c = (l2y2 - l2y1) / (l2x2 - l2x1);
				b = l1y1 - (a * l1x1);
				d = l2y1 - (c * l2x1);
				if (a == c) 
				{
					if (b == d)
					{ deckung = true; }
					else { deckung = false;
					       parallel = true; }
				}
				else { xs = (d - b) / (a - c); }
				ys = (a * xs) + b;
				break;
				}
			default:
				{
				//cannot be reached
				break;
				}
			}
		switch (fall)
			{
			// | * | 1
			case 1:
				{
				if ((l1x1 == l2x1) && (((l2y1 >= l1y1) && (l2y1 <= l1y2)) || ((l2y2 >= l1y1) && (l2y2 <= l1y2))))
					{ crossed = true; }
				else
					{ crossed = false; }
				break;
				}
			// | * - 2
			case 2:
				{
				if (((l2y1 >= l1y1) && (l2y1 <= l1y2)) && ((l1x1 >= l2x1) && (l1x1 <= l2x2)))
					{ crossed = true; }
				else
					{ crossed = false; }
				break;
				}
			// - * | 5
			case 5:
				{
				if (((l2x1 >= l1x1) && (l2x1 <= l1x2)) && ((l1y1 >= l2y1) && (l1y1 <= l2y2)))
					{ crossed = true; }
				else
					{ crossed = false; }
				break;
				}
			// - * - 6
			case 6:
				{
				if ((l1y1 == l2y1) && (((l2x1 >= l1x1) && (l2x1 <= l1x2)) || ((l2x2 >= l1x1) && (l2x2 <= l1x2))))
					{ crossed = true; }
				else
					{ crossed = false; }
				break;
				}
			// | * / 3, | * \ 4
			case 3: case 4:
				{
				if ((ys >= l1y1) && (ys <= l1y1))
					{ crossed = true; }
				else
					{ crossed = false; }
				break;
				}
			// / * | 9, \ * | 13
			case 9: case 13:
				{
				if ((ys >= l2y1) && (ys <= l2y2))
					{ crossed = true; }
				else
					{ crossed = false; }
				break;
				}
			// up-up
			case 10: case 7: case 11:
				{
				if (parallel) { crossed = false; }
				else if (deckung)
					{
					if (((l2x1 >= l1x1) && (l2x1 <= l1x2)) || ((l2x2 >= l1x1) && (l2x2 <= l1x2)))
						{ crossed = true; }
					else { crossed = false; }
					}
				else
					{
					if ((((xs >= l1x1) && (xs <= l1x2)) && ((ys >= l1y1) && (ys <= l1y2))) &&
						(((xs >= l2x1) && (xs <= l2x2)) && ((ys >= l2y1) && (ys <= l2y2))))
						{ crossed = true; }
					else
						{ crossed = false; }
					}
				break;
				}
			// up-down
			case 12:
				{
				if ((((xs >= l1x1) && (xs <= l1x2)) && ((ys >= l1y1) && (ys <= l1y2))) &&
					(((xs >= l2x1) && (xs <= l2x2)) && ((ys <= l2y1) && (ys >= l2y2))))
					{ crossed = true; }
				else
					{ crossed = false; }
				break;
				}
			// down-up
			case 15:
				{
				if ((((xs >= l1x1) && (xs <= l1x2)) && ((ys <= l1y2) && (ys >= l1y2))) &&
					(((xs >= l2x1) && (xs <= l2x2)) && ((ys >= l2y1) && (ys <= l2y2))))
					{ crossed = true; }
				else
					{ crossed = false; }
				break;
				}
			// down-down
			case 16: case 14: case 8:
				{
				if (parallel) { crossed = false; }
				else if (deckung)
					{
					if (((l2x1 >= l1x1) && (l2x1 <= l1x2)) || ((l2x2 >= l1x1) && (l2x2 <= l1x2)))
						{ crossed = true; }
					else { crossed = false; }
					}
				else
					{
					if ((((xs <= l1x1) && (xs >= l1x2)) && ((ys <= l1y1) && (ys >= l1y2))) &&
						(((xs <= l2x1) && (xs >= l2x2)) && ((ys <= l2y1) && (ys >= l2y2))))
						{ crossed = true; }
					else	{ crossed = false; }
					}
				break;
				}				
			//zero
			default:
				{
				//cannot be reached
				break;
				}
			}
			if (crossed)
				{
				System.out.println ("the lines do cross or at least touch");
				}
			else
				{
				System.out.println ("the lines neither cross nor touch");
				}
	}
}

4164 (letsencrypt.org_&_apache2_config_safety_{([complex])})

$ wget https://dl.eff.org/certbot-auto
$ mv certbot-auto /usr/local/bin/certbot-auto
$ chown root /usr/local/bin/certbot-auto
$ chmod 0755 /usr/local/bin/certbot-auto
$ cd /usr/local/bin/
$ ./certbot-auto certonly \
--manual \
--preferred-challenges=dns \
--email mail@host.com \
--server https://acme-v02.api.letsencrypt.org/directory \
--agree-tos \
-d example.org -d *.example.org
//now DNS-challenge
$ chmod -R 755 /etc/letsencrypt/live/

—-

$ less /etc/apache2/sites-available/000-default.conf

<VirtualHost *:80>
ServerName example.org
Redirect / https://example.org

DocumentRoot /var/www/example.org
</VirtualHost>

<VirtualHost *:80>
ServerAlias *.example.org
RewriteEngine On
RewriteCond %{HTTPS} off
RewriteRule (.*) https://%{HTTP_HOST}%{REQUEST_URI} [R=301,L]
</VirtualHost>

<VirtualHost *.443>
ServerName example.org
DocumentRoot /var/www/example.org

SSLEngine On
SSLProxyEngine On
SSLProxyVerify None
SSLProxyCheckPeerCN Off
SSLProxyPeerName Off
SSLProxyCheckPeerExpire Off
ProxyPreserveHost On

SSLCertificateFile /etc/letsencrypt/live/example.org/cert.pem
SSLCertificateKeyFile /etc/letsencrypt/live/example.org/privkey.pem
SSLCertificateChainFile /etc/letsencrypt/live/example.org/fullchain.pem

ProxyPass / https://localhost:8443/
ProxyPassReverse / https://localhost:8443/
</VirtualHost>

<VirtualHost *:443>
ServerAlias *.example.org

SSLEngine On
SSLProxyEngine On
SSLProxyVerify None
SSLProxyCheckPeerCN Off
SSLProxyPeerName Off
SSLProxyCheckPeerExpire Off
ProxyPreserveHost On

SSLCertificateFile /etc/letsencrypt/live/example.org/cert.pem
SSLCertificateKeyFile /etc/letsencrypt/live/example.org/privkey.pem
SSLCertificateChainFile /etc/letsencrypt/live/example.org/fullchain.pem

ProxyPass / https://localhost:8443/
ProxyPassReverse / https://localhost:8443/
</VirtualHost>

—-

$ less /etc/apache2/sites-available/default-ssl.conf

<VirtualHost _default_:443>
ServerName example.org:443
DocumentRoot /var/www/example.org

SSLEngine on

SSLCertificateFile /etc/letsencrypt/live/example.org/cert.pem
SSLCertificateKeyFile /etc/letsencrypt/live/example.org/privkey.pem
SSLCertificateChainFile /etc/letsencrypt/live/example.org/fullchain.pem
</VirtualHost>

4123 (time-array)

class time
{
	//main method, arguments may be passed on commandline execution
	public static void main(String args[])
	{
		// declare and initialize 4D array
		int arr[][][][] = {
								{
									{ {0,0,0},{2,6,1},{5,4,2} },
									{ {0,0,0},{9,6,2},{0,1,3} },
									{ {0,0,0},{4,5,6},{2,5,2} }
								},
								{
									{ {0,4,2},{1,6,1},{5,4,2} },
									{ {3,7,9},{9,6,2},{0,1,3} },
									{ {5,8,4},{4,5,6},{2,5,2} }
								},
								{
									{ {7,5,2},{2,6,2},{6,5,5} },
									{ {6,8,9},{7,5,2},{8,5,9} },
									{ {2,8,5},{3,7,7},{4,5,8} }
								}
							};
		// print 4D (time) array in four nested for-loops
		for (int l = 0; l<3; l++)		
		{	
			//print 3D-element number
			System.out.println(l);
			for (int i=0; i< 3 ; i++)
			{
				for (int j=0; j < 3 ; j++)
				{
					for (int k=0; k < 3; k++)
					{
						//print element
						System.out.print(arr[l][i][j][k] + " ");
					}
					//print whitespaces
					System.out.print("     ");
				}
				//newline
				System.out.println();
			}
		}
	}
}

4003 (switch case exp)

python 3

"""
experiment with a main menu and switch / case construction
"""
class _Getch(object):
    """read character from stdin without return and split workflow into three tasks"""
    def __init__(self):
        try:
            self.impl = _GetchWindows()
        except ImportError:
            self.impl = _GetchUnix()

    def __call__(self): 
        return self.impl()

class _GetchUnix(object):
    def __init__(self):
        import tty, sys

    def __call__(self):
        import sys, tty, termios
        fd = sys.stdin.fileno()
        old_settings = termios.tcgetattr(fd)
        try:
            tty.setraw(sys.stdin.fileno())
            ch = sys.stdin.read(1)
        finally:
            termios.tcsetattr(fd, termios.TCSADRAIN, old_settings)
        return ch

class _GetchWindows(object):
    def __init__(self):
        import msvcrt

    def __call__(self):
        import msvcrt
        return msvcrt.getch()

class Switcher(object):
    def main_menu(self, argument):
        """dispatch method / main menu with switch case"""
        method_name = 'fall_' + str(argument)
        # Get the method from 'self'. Default to a lambda.
        method = getattr(self, method_name, lambda: "nothing to compute")
        # Call the method as we return it
        return method()
  
    def fall_1(self):
        #emulate slow progress
        from time import sleep
        import sys
        i=0
        for i in range (12):
            sleep (0.5)
            sys.stdout.write (".")
            sys.stdout.flush()
        print("")   
        return "January"
  
    def fall_2(self):
        #output Switcher dictionary
        print (Switcher.__dict__)
        return "February"
  
    def fall_3(self):
        #return given string
        query = input ("gimme a string: ")
        return query

def main():
    foo = _Getch()
    char = "#"
    while (ord(char) != 52):
        print ("----------------------------")
        print ("| 1 : menu point one       |")
        print ("| 2 : menu point two       |")
        print ("| 3 : menu point three     |")
        print ("| 4 : ende                 |")
        print ("----------------------------")
        char = foo.impl()
        wert = ord(char)
        choice = wert - 48
        #print (char + " _ " + str(wert))
        bar = Switcher()
        output = bar.main_menu(choice)
        print (output)
    print ("programmende")
		
if __name__ == "__main__":
    main()

3912 (schnipsel)

   <!-- captain' s message -->
    <!-- script determination -->
    <script language="javascript">
      //popup message and default value
      var person = prompt("whoami", "captain");
      //filled ?
      if (person != null)
      {
        //fit ?
        if (person != "superuser")
        { 
          //this might not work in modern browsers (close window)
          this.focus();
          self.opener=this;
          self.close();
        }//end fit
      else 
        {
          //checked (!) and output
          alert ("Hi " + person + ", works?");
        }//end else
      }//end construct
    </script>
    <!-- /captain' s message -->

3727 (q)

Does everything in my dataset need a URI?
How do I create URIs for things in my dataset?
Should I reuse existing URIs or create my own and set sameAs links?
Should I make my URIs human readable?
How do I discover URIs for a thing?
Which URI should I choose if several are available?
Which vocabularies should I use for describing my dataset?
Where do I find vocabularies?
How should I choose between two or more existing vocabularies for describing my dataset?
Where do I find vocabularies?
How do I make a vocabulary?
Should I use RDFS or OWL?
How do I create links between datasets?
Do links need to be bidirectional?
What is the role of rdfs:seeAlso?
—-
http://www.linkeddatatools.com/

3696 (progress)

a bit of a catch 22 after upgrading to 5.1.1

last time I fixed it with removing a trailing slash in config.json, now there must be another reason

apache2 conf unchanged

.acl seems right, must look further into the acl checking mechanisms

time to think

but it’ s stated everywhere as *experimental* and that’ s what I do

switch situation case serious { appropriate behaviour }

3595 (some complex debug info)

—-

/var/www/html$less config.json
{
  "root": "/var/www/html/data",
  "port": "8443",
  "serverUri": "https://solidweb.org",
  "webid": true,
  "mount": "/",
  "configPath": "/var/www/html/config",
  "configFile": "/var/www/html/config.json",
  "dbPath": "/var/www/html/.db",
  "sslKey": "/etc/letsencrypt/live/solidweb.org/privkey.pem",
  "sslCert": "/etc/letsencrypt/live/solidweb.org/fullchain.pem",
  "multiuser": true,
  "enforceToc": false,
  "disablePasswordChecks": false,
  "supportEmail": "meisdata@gmail.com",
  "server": {
    "name": "solidweb.org",
    "description": "free the web",
    "logo": "logo.png"
  }
}

—-

/var/www/html$ls -la
insgesamt 96
drwxr-xr-x 6 root  root      4096 Jan  6 14:43 .
drwxr-xr-x 4 root  root      4096 Dez  8 18:31 ..
drwxr-xr-x 4 solid www-data  4096 Jan  5 16:16 config
-rw-r--r-- 1 solid www-data   593 Jan  5 16:15 config.json
drwxr-xr-x 4 solid www-data  4096 Jan  5 16:17 data
drwxr-xr-x 3 solid www-data  4096 Jan  5 16:16 .db
-rw-r--r-- 1 root  root         0 Jan  6 14:43 docroot
-rw-r--r-- 1 root  root       145 Dez  8 19:04 index.html
-rw-r--r-- 1 root  root     63848 Dez 10 22:42 logo.png

—-

/var/www/html$du
8	./config/templates/new-account/inbox
32	./config/templates/new-account/settings
8	./config/templates/new-account/private
8	./config/templates/new-account/.well-known
12	./config/templates/new-account/profile
8	./config/templates/new-account/public
120	./config/templates/new-account
20	./config/templates/emails
8	./config/templates/server/.well-known
44	./config/templates/server
188	./config/templates
12	./config/views/shared
40	./config/views/account
52	./config/views/auth
108	./config/views
300	./config
8	./data/ewingson.solidweb.org/inbox
32	./data/ewingson.solidweb.org/settings
8	./data/ewingson.solidweb.org/private
8	./data/ewingson.solidweb.org/.well-known
12	./data/ewingson.solidweb.org/profile
8	./data/ewingson.solidweb.org/public
120	./data/ewingson.solidweb.org
8	./data/solidweb.org/.well-known
44	./data/solidweb.org
168	./data
4	./.db/oidc/op/refresh
4	./.db/oidc/op/tokens
8	./.db/oidc/op/clients
4	./.db/oidc/op/codes
52	./.db/oidc/op
12	./.db/oidc/rp/clients
16	./.db/oidc/rp
8	./.db/oidc/users/users
8	./.db/oidc/users/users-by-email
20	./.db/oidc/users
92	./.db/oidc
96	./.db
664	.

—-

/var/www/html/data$ls -la
insgesamt 16
drwxr-xr-x 4 solid www-data 4096 Jan  6 14:44 .
drwxr-xr-x 6 root  root     4096 Jan  6 14:44 ..
drwxr-xr-x 8 root  root     4096 Jan  5 16:17 ewingson.solidweb.org
drwxr-xr-x 3 root  root     4096 Jan  5 16:16 solidweb.org

—-

/var/www/html/data$du
8	./ewingson.solidweb.org/inbox
32	./ewingson.solidweb.org/settings
8	./ewingson.solidweb.org/private
8	./ewingson.solidweb.org/.well-known
12	./ewingson.solidweb.org/profile
8	./ewingson.solidweb.org/public
120	./ewingson.solidweb.org
8	./solidweb.org/.well-known
44	./solidweb.org
176	.

—-

$less /etc/apache2/sites-available/000-default.conf
<VirtualHost *:80>
	# The ServerName directive sets the request scheme, hostname and port that
	# the server uses to identify itself. This is used when creating
	# redirection URLs. In the context of virtual hosts, the ServerName
	# specifies what hostname must appear in the request's Host: header to
	# match this virtual host. For the default virtual host (this file) this
	# value is not decisive as it is used as a last resort host regardless.
	# However, you must set it for any further virtual host explicitly.
	ServerName solidweb.org
	Redirect "/" "https://solidweb.org"
	
	ServerAdmin webmaster@localhost
	DocumentRoot /var/www/html

	# Available loglevels: trace8, ..., trace1, debug, info, notice, warn,
	# error, crit, alert, emerg.
	# It is also possible to configure the loglevel for particular
	# modules, e.g.
	#LogLevel info ssl:warn

	ErrorLog ${APACHE_LOG_DIR}/error.log
	CustomLog ${APACHE_LOG_DIR}/access.log combined

	# For most configuration files from conf-available/, which are
	# enabled or disabled at a global level, it is possible to
	# include a line for only one particular virtual host. For example the
	# following line enables the CGI configuration for this host only
	# after it has been globally disabled with "a2disconf".
	#Include conf-available/serve-cgi-bin.conf
</VirtualHost>

<VirtualHost *:443>
ServerName solidweb.org
ServerAdmin webmaster@localhost
DocumentRoot /var/www/html
ErrorLog /var/log/apache2/virtual.host.error.log
CustomLog /var/log/apache2/virtual.host.access.log combined

SSLEngine On
SSLProxyEngine On
SSLProxyVerify None
SSLProxyCheckPeerCN Off
SSLProxyCheckPeerName Off
SSLProxyCheckPeerExpire Off
ProxyPreserveHost On

SSLCertificateFile /etc/letsencrypt/live/solidweb.org/cert.pem
SSLCertificateKeyFile /etc/letsencrypt/live/solidweb.org/privkey.pem
SSLCertificateChainFile /etc/letsencrypt/live/solidweb.org/fullchain.pem

ProxyPass / https://localhost:8443/
ProxyPassReverse / https://localhost:8443/
</VirtualHost>
<VirtualHost *:443>
#DocumentRoot /var/www/html
#ServerName solidweb.org
ServerAlias *.solidweb.org
SSLEngine On
SSLProxyEngine On
SSLProxyVerify None
SSLProxyCheckPeerCN Off
SSLProxyCheckPeerName Off
SSLProxyCheckPeerExpire Off
ProxyPreserveHost On

SSLCertificateFile /etc/letsencrypt/live/solidweb.org/cert.pem
SSLCertificateKeyFile /etc/letsencrypt/live/solidweb.org/privkey.pem
SSLCertificateChainFile /etc/letsencrypt/live/solidweb.org/fullchain.pem

ProxyPass / https://localhost:8443/
ProxyPassReverse / https://localhost:8443/

</VirtualHost>
# vim: syntax=apache ts=4 sw=4 sts=4 sr noet

—-

$less /etc/apache2/sites-available/default-ssl.conf
<IfModule mod_ssl.c>
	<VirtualHost _default_:443>
		ServerAdmin webmaster@localhost
		ServerName solidweb.org:443

		DocumentRoot /var/www/html

		# Available loglevels: trace8, ..., trace1, debug, info, notice, warn,
		# error, crit, alert, emerg.
		# It is also possible to configure the loglevel for particular
		# modules, e.g.
		#LogLevel info ssl:warn

		ErrorLog ${APACHE_LOG_DIR}/error.log
		CustomLog ${APACHE_LOG_DIR}/access.log combined

		# For most configuration files from conf-available/, which are
		# enabled or disabled at a global level, it is possible to
		# include a line for only one particular virtual host. For example the
		# following line enables the CGI configuration for this host only
		# after it has been globally disabled with "a2disconf".
		#Include conf-available/serve-cgi-bin.conf

		#   SSL Engine Switch:
		#   Enable/Disable SSL for this virtual host.
		#SSLEngine on
		#SSLProxyEngine On
		#SSLProxyVerify none
		#SSLProxyCheckPeerCN off
		#SSLProxyCheckPeerName off
		#SSLProxyCheckPeerExpire off
		#ProxyPreserveHost on

		#ProxyPass / https://solidweb.org:8443/
		#ProxyPassReverse / https://solidweb.org:8443/

		#   A self-signed (snakeoil) certificate can be created by installing
		#   the ssl-cert package. See
		#   /usr/share/doc/apache2/README.Debian.gz for more info.
		#   If both key and certificate are stored in the same file, only the
		#   SSLCertificateFile directive is needed.
		#SSLCertificateFile /etc/letsencrypt/live/solidweb.org/fullchain.pem
		#/etc/ssl/certs/ssl-cert-snakeoil.pem
		#SSLCertificateKeyFile /etc/letsencrypt/live/solidweb.org/privkey.pem
		#/etc/ssl/private/ssl-cert-snakeoil.key

		#   Server Certificate Chain:
		#   Point SSLCertificateChainFile at a file containing the
		#   concatenation of PEM encoded CA certificates which form the
		#   certificate chain for the server certificate. Alternatively
		#   the referenced file can be the same as SSLCertificateFile
		#   when the CA certificates are directly appended to the server
		#   certificate for convinience.
		#SSLCertificateChainFile /etc/letsencrypt/live/solidweb.org/fullchain.pem
		# /etc/apache2/ssl.crt/server-ca.crt
		
		#modified 20181207
		SSLCertificateFile /etc/letsencrypt/live/solidweb.org/cert.pem
		SSLCertificateKeyFile /etc/letsencrypt/live/solidweb.org/privkey.pem
		SSLCertificateChainFile /etc/letsencrypt/live/solidweb.org/fullchain.pem
		#end modified

		#   Certificate Authority (CA):
		#   Set the CA certificate verification path where to find CA
		#   certificates for client authentication or alternatively one
		#   huge file containing all of them (file must be PEM encoded)
		#   Note: Inside SSLCACertificatePath you need hash symlinks
		#		 to point to the certificate files. Use the provided
		#		 Makefile to update the hash symlinks after changes.
		#SSLCACertificatePath /etc/ssl/certs/
		#SSLCACertificateFile /etc/apache2/ssl.crt/ca-bundle.crt

		#   Certificate Revocation Lists (CRL):
		#   Set the CA revocation path where to find CA CRLs for client
		#   authentication or alternatively one huge file containing all
		#   of them (file must be PEM encoded)
		#   Note: Inside SSLCARevocationPath you need hash symlinks
		#		 to point to the certificate files. Use the provided
		#		 Makefile to update the hash symlinks after changes.
		#SSLCARevocationPath /etc/apache2/ssl.crl/
		#SSLCARevocationFile /etc/apache2/ssl.crl/ca-bundle.crl

		#   Client Authentication (Type):
		#   Client certificate verification type and depth.  Types are
		#   none, optional, require and optional_no_ca.  Depth is a
		#   number which specifies how deeply to verify the certificate
		#   issuer chain before deciding the certificate is not valid.
		#SSLVerifyClient require
		#SSLVerifyDepth  10

		#   SSL Engine Options:
		#   Set various options for the SSL engine.
		#   o FakeBasicAuth:
		#	 Translate the client X.509 into a Basic Authorisation.  This means that
		#	 the standard Auth/DBMAuth methods can be used for access control.  The
		#	 user name is the `one line' version of the client's X.509 certificate.
		#	 Note that no password is obtained from the user. Every entry in the user
		#	 file needs this password: `xxj31ZMTZzkVA'.
		#   o ExportCertData:
		#	 This exports two additional environment variables: SSL_CLIENT_CERT and
		#	 SSL_SERVER_CERT. These contain the PEM-encoded certificates of the
		#	 server (always existing) and the client (only existing when client
		#	 authentication is used). This can be used to import the certificates
		#	 into CGI scripts.
		#   o StdEnvVars:
		#	 This exports the standard SSL/TLS related `SSL_*' environment variables.
		#	 Per default this exportation is switched off for performance reasons,
		#	 because the extraction step is an expensive operation and is usually
		#	 useless for serving static content. So one usually enables the
		#	 exportation for CGI and SSI requests only.
		#   o OptRenegotiate:
		#	 This enables optimized SSL connection renegotiation handling when SSL
		#	 directives are used in per-directory context.
		#SSLOptions +FakeBasicAuth +ExportCertData +StrictRequire
		<FilesMatch "\.(cgi|shtml|phtml|php)$">
				SSLOptions +StdEnvVars
		</FilesMatch>
		<Directory /usr/lib/cgi-bin>
				SSLOptions +StdEnvVars
		</Directory>

		#   SSL Protocol Adjustments:
		#   The safe and default but still SSL/TLS standard compliant shutdown
		#   approach is that mod_ssl sends the close notify alert but doesn't wait for
		#   the close notify alert from client. When you need a different shutdown
		#   approach you can use one of the following variables:
		#   o ssl-unclean-shutdown:
		#	 This forces an unclean shutdown when the connection is closed, i.e. no
		#	 SSL close notify alert is send or allowed to received.  This violates
		#	 the SSL/TLS standard but is needed for some brain-dead browsers. Use
		#	 this when you receive I/O errors because of the standard approach where
		#	 mod_ssl sends the close notify alert.
		#   o ssl-accurate-shutdown:
		#	 This forces an accurate shutdown when the connection is closed, i.e. a
		#	 SSL close notify alert is send and mod_ssl waits for the close notify
		#	 alert of the client. This is 100% SSL/TLS standard compliant, but in
		#	 practice often causes hanging connections with brain-dead browsers. Use
		#	 this only for browsers where you know that their SSL implementation
		#	 works correctly.
		#   Notice: Most problems of broken clients are also related to the HTTP
		#   keep-alive facility, so you usually additionally want to disable
		#   keep-alive for those clients, too. Use variable "nokeepalive" for this.
		#   Similarly, one has to force some clients to use HTTP/1.0 to workaround
		#   their broken HTTP/1.1 implementation. Use variables "downgrade-1.0" and
		#   "force-response-1.0" for this.
		BrowserMatch "MSIE [2-6]" \
				nokeepalive ssl-unclean-shutdown \
				downgrade-1.0 force-response-1.0
		# MSIE 7 and newer should be able to use keepalive
		BrowserMatch "MSIE [17-9]" ssl-unclean-shutdown

	</VirtualHost>
</IfModule>

# vim: syntax=apache ts=4 sw=4 sts=4 sr noet

—-

#systemctl -l status solid.service
● solid.service
   Loaded: loaded (/lib/systemd/system/solid.service; enabled)
   Active: inactive (dead) since Do 2019-01-03 22:51:22 CET; 2 days ago
     Docs: https://solid.inrupt.com/docs/
  Process: 21525 ExecStart=/usr/bin/solid start (code=exited, status=0/SUCCESS)
 Main PID: 21525 (code=exited, status=0/SUCCESS)

Jan 03 22:51:22 lvps83-169-46-66.dedicated.hosteurope.de solid[21525]: ERROR Can't find SSL key in /etc/letsencrypt/live/solidweb.org/privkey.pem

—-

/etc/letsencrypt/live/solidweb.org$ls -la
insgesamt 36
drwxr-xr-x 3 root root 4096 Jan  6 14:52 .
drwx------ 3 root root 4096 Dez  7 00:00 ..
-rw-r--r-- 1 root root  276 Dez  9 16:08 .acl
-rw-r--r-- 1 root root    0 Jan  6 14:52 ca
-rw-r--r-- 1 root root 1923 Dez  7 17:01 cert1.pem
lrwxrwxrwx 1 root root    9 Dez 14 16:50 cert.pem -> cert1.pem
-rw-r--r-- 1 root root 1647 Dez  7 17:01 chain1.pem
lrwxrwxrwx 1 root root   10 Dez 14 16:54 chain.pem -> chain1.pem
-rw-r--r-- 1 root root 3570 Dez  7 00:24 fullchain1.pem
lrwxrwxrwx 1 root root   14 Dez 14 16:55 fullchain.pem -> fullchain1.pem
-rw-r--r-- 1 root root 1708 Dez  7 00:25 privkey1.pem
lrwxrwxrwx 1 root root   12 Dez 14 16:55 privkey.pem -> privkey1.pem
-rw-r--r-- 1 root root  692 Dez  7 00:00 README
drwxr-xr-x 2 root root 4096 Dez  9 16:08 .well-known

—-

$less /lib/systemd/system/solid.service
[Unit]
Description=solid - social linked data
Documentation=https://solid.inrupt.com/docs/
After=network.target

[Service]
Type=simple
User=solid
WorkingDirectory=/var/www/your.host.example.org
ExecStart=/usr/bin/solid start
Restart=on-failure

[Install]
WantedBy=multi-user.target

—-
as of today