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Overview
Comment:Updates and fixes to the url-shortener.tcl demo
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SHA3-256: e74cb059e3a0f0b1e7945a6e639694d3d307ed526cb2e79d921035fdb3c7bb70
User & Date: drh 2024-05-19 20:46:00
Context
2024-05-19
22:08
Fix the wapp-content-security-policy command so that it allows newline characters in the security policy input. These are removed before the security policy is added to the header. (check-in: cdac0cdb04 user: drh tags: trunk)
20:46
Updates and fixes to the url-shortener.tcl demo (check-in: e74cb059e3 user: drh tags: trunk)
20:15
First prototype of a URL shortener script. (check-in: 3e71cc718c user: drh tags: trunk)
Changes
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Changes to examples/url-shortener.tcl.

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#  Setup:
set BASEURL                https://sqlite.org/u
set ADMIN_CAPABILITY       i
set DATABASE               /url-shortener.db
#
########
package require wapp















# Open the shortener database.  Initialize it if necessary.
#
proc open-database {} {
  global DATABASE
  sqlite3 db $DATABASE
  db eval {








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#  Setup:
set BASEURL                https://sqlite.org/u
set ADMIN_CAPABILITY       i
set DATABASE               /url-shortener.db
#
########
package require wapp

# Common header for all pages that do no redirect
#
proc common-header {} {
  wapp-trim {
    <div  class='fossil-doc' data-title='URL Shortener'>
  }
}
proc common-footer {} {
  wapp-trim {
    </div>
  }
}


# Open the shortener database.  Initialize it if necessary.
#
proc open-database {} {
  global DATABASE
  sqlite3 db $DATABASE
  db eval {
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    ) WITHOUT ROWID;
  }
}

# Debugging: show the environment
proc wapp-page-env {} {
  wapp-allow-xorigin-params

  wapp-trim {
    <h1>Wapp Environment</h1>
    <pre>%html([wapp-debug-env])</pre>
  }

}

# Issue the "Not Found" page
proc wapp-page-notfound {} {
  wapp-reply-code "404 Not Found"
  wapp-trim {
    <h1>Not Found</h1>
    <p>No such resource:
    "%html%([wapp-param BASE_URL])%%html%([wapp-param PATH_INFO])%"</p>
  }
}

# Do a redirect
proc wapp-default {} {
  set x [wapp-param PATH_HEAD {}]
  if {$x==""} {
    wapp-page-search
    return
  }
  open-database
  set redir [db one {SELECT redir FROM url WHERE name=$x}]
  if {$redir==""} {
    wapp-page-notfound
    return
  }
  wapp-redirect $redir
}

# Check credentials.  Return true to abort because credentials
# are invalid.
#
proc check-credentials {} {
  global ADMIN_CAPABILITY env
  if {![info exists env(FOSSIL_CAPABILITIES)]} {
    wapp-page-notfound
    return 1
  }
  return 0
}

# Search for an existing entry
#
proc wapp-page-search {} {
  if {[check-credentials]} return

  set base [wapp-param BASE_URL]
  wapp-trim {
    <h1>Admin URL Shortener At %html%($::DATABASE)%</h1>

    <p><a href="%url($base)/editentry">Create-New-URL</a>


    <p>
    <form>
    Search: <input type="text" size="60" name="s">
    <input type="submit" name="s1" value="Go">
    </form>
  }
  if {[wapp-param-exists s]} {
    set s [wapp-param s]
    wapp-trim {
      <h2>Search results for %html($s):</h2><ol>
    }
    open-database
    set pattern %$s%
    set cnt 0
    db eval {
      SELECT name, redir FROM url 
       WHERE name LIKE $pattern OR redir LIKE $pattern
    } {
      wapp-trim {
        <li><a href="%url($base)/editentry/%url($name)">%html($name)</a>

      }
      incr cnt
    }
    wapp-trim {</ol>}
    if {$cnt==0} {
      wapp-trim {
        <p>No matches found</p>
      }
    }
  }





































}

# Create or edit a new URL shortener entry.
#
# Name of the entry to be editted is in PATH_TAIL.  Or if PATH_TAIL is
# blank, create a new entry.
#
proc wapp-page-editentry {} {
  global BASEURL
  if {[check-credentials]} return

  if {[wapp-param-exists cancel]} {
    wapp-redirect [wapp-param BASEURL]/search
    return
  }
  open-database
  set hardname [wapp-param PATH_TAIL {}]
  set name [wapp-param name $hardname]
  set redir [wapp-param redir {}]
  set notes [wapp-param notes {}]
  wapp-trim {
    <head></head>
    <body>
  }
  set errmsg {}
  if {[wapp-param-exists s1]} {
    if {$hardname==""} {
      set e [db one {SELECT count(*) FROM url WHERE name=$name}]
      if {$e==1} {
        set errmsg "Shortened URL name "$name" already exists.\
        Pick a different name."
      } elseif {[string length $name]<4} {
        set errmsg "Shortened URL name "$name" too short.\
                    Must be at least 4 characters."
      } elseif {[regexp {[^a-z0-9]} $name]} {
        set errmsg "Shortened URL name "$name" contains invalid characters. \
          The name must be lower-case ASCII letters and digits only."



      } else {
        set user $::env(FOSSIL_USER)
        db eval {
          INSERT INTO url(name,redir,user,notes,ctime,mtime)
          VALUES($name,$redir,$user,$notes,datetime(),datetime())
        }
        set hardname $name








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    ) WITHOUT ROWID;
  }
}

# Debugging: show the environment
proc wapp-page-env {} {
  wapp-allow-xorigin-params
  common-header
  wapp-trim {
    <h1>Wapp Environment</h1>
    <pre>%html([wapp-debug-env])</pre>
  }
  common-footer
}

# Issue the "Not Found" page
proc wapp-page-nf {} {
  wapp-reply-code "404 Not Found"
  wapp-trim {
    <h1>Not Found</h1>
    <p>No such resource:
    "%html%([wapp-param BASE_URL])%%html%([wapp-param PATH_INFO])%"</p>
  }
}

# Do a redirect
proc wapp-default {} {
  set x [wapp-param PATH_HEAD {}]
  if {$x==""} {
    wapp-page-sx
    return
  }
  open-database
  set redir [db one {SELECT redir FROM url WHERE name=$x}]
  if {$redir==""} {
    wapp-page-nf
    return
  }
  wapp-redirect $redir
}

# Check credentials.  Return true to abort because credentials
# are invalid.
#
proc check-credentials {} {
  global ADMIN_CAPABILITY env
  if {![info exists env(FOSSIL_CAPABILITIES)]} {
    wapp-page-nf
    return 1
  }
  return 0
}

# Search for an existing entry
#
proc wapp-page-sx {} {
  if {[check-credentials]} return
  common-header
  set base [wapp-param BASE_URL]
  wapp-trim {

    <p>
    <a href="%url($base)/ee">Create-New-URL</a>
    <a href="%url($base)/lr">List-Recents</a>
    <a href="%url($base)/env">CGI-Environment</a>
    <p>
    <form>
    Search: <input type="text" size="60" name="s">
    <input type="submit" name="s1" value="Go">
    </form>
  }
  if {[wapp-param-exists s]} {
    set s [wapp-param s]
    wapp-trim {
      <h2>Search results for %html($s):</h2><ol>
    }
    open-database
    set pattern %$s%
    set cnt 0
    db eval {
      SELECT name, redir, user, mtime FROM url 
       WHERE name LIKE $pattern OR redir LIKE $pattern
    } {
      wapp-trim {
        <li><a href="%url($base)/ee/%url($name)">%html($name)</a>
        &rarr; %html($redir) (by %html($user) on %html($mtime))
      }
      incr cnt
    }
    wapp-trim {</ol>}
    if {$cnt==0} {
      wapp-trim {
        <p>No matches found</p>
      }
    }
  }
  common-footer
}

# Show recent modified URL shorteners pages
#
proc wapp-page-lr {} {
  if {[check-credentials]} return
  common-header
  set base [wapp-param BASE_URL]
  wapp-trim {
    <p>
    <a href="%url($base)/ee">Create-New-URL</a>
    <a href="%url($base)/sx">Search</a>
    <a href="%url($base)/env">CGI-Environment</a>
  }
  wapp-trim {
    <ol>
  }
  open-database
  set cnt 0
  db eval {
    SELECT name, redir, user, mtime FROM url
     ORDER BY mtime DESC LIMIT 50
  } {
    wapp-trim {
      <li><a href="%url($base)/ee/%url($name)">%html($name)</a>
      &rarr; %html($redir) (by %html($user) on %html($mtime))
    }
    incr cnt
  }
  wapp-trim {</ol>}
  if {$cnt==0} {
    wapp-trim {
      <p>No entries</p>
    }
  }
  common-footer
}

# Create or edit a new URL shortener entry.
#
# Name of the entry to be editted is in PATH_TAIL.  Or if PATH_TAIL is
# blank, create a new entry.
#
proc wapp-page-ee {} {
  global BASEURL
  if {[check-credentials]} return
  common-header
  if {[wapp-param-exists cancel]} {
    wapp-redirect [wapp-param BASE_URL]/sx
    return
  }
  open-database
  set hardname [wapp-param PATH_TAIL {}]
  set name [wapp-param name $hardname]
  set redir [wapp-param redir {}]
  set notes [wapp-param notes {}]
  wapp-trim {
    <head></head>
    <body>
  }
  set errmsg {}
  if {[wapp-param-exists s1]} {
    if {$hardname==""} {
      set e [db one {SELECT count(*) FROM url WHERE name=$name}]
      if {$e==1} {
        set errmsg "Shortened URL name \"$name\" already exists.\
        Pick a different name."
      } elseif {[string length $name]<4} {
        set errmsg "Shortened URL name \"$name\" too short.\
                    Must be at least 4 characters."
      } elseif {[regexp {[^a-z0-9]} $name]} {
        set errmsg "Shortened URL name \"$name\" contains invalid characters. \
          The name must be lower-case ASCII letters and digits only."
      } elseif {[lsearch [info procs] wapp-page-$name]>=0} {
        set errmsg "Shortened URL name \"$name\" already exists.\
        Pick a different name."
      } else {
        set user $::env(FOSSIL_USER)
        db eval {
          INSERT INTO url(name,redir,user,notes,ctime,mtime)
          VALUES($name,$redir,$user,$notes,datetime(),datetime())
        }
        set hardname $name
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    <td>&nbsp</td>
    <td><input type="submit" name="s1" value="Submit">
    <input type="submit" name="cancel" value="Cancel">
    </tr>
    </table>
    </form>
  }

}

wapp-start $argv








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    <td>&nbsp</td>
    <td><input type="submit" name="s1" value="Submit">
    <input type="submit" name="cancel" value="Cancel">
    </tr>
    </table>
    </form>
  }
  common-footer
}

wapp-start $argv