thirdparty/google_appengine/lib/webob/docs/wiki-example-code/example.py
author Lennard de Rijk <ljvderijk@gmail.com>
Tue, 25 Aug 2009 11:43:14 +0200
changeset 2795 776aae4d0499
parent 109 620f9b141567
permissions -rwxr-xr-x
Set new Melange version number to 0-5-20090825 in app.yaml.template.
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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import os
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import re
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from webob import Request, Response
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from webob import exc
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from tempita import HTMLTemplate
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VIEW_TEMPLATE = HTMLTemplate("""\
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<html>
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 <head>
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  <title>{{page.title}}</title>
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 </head>
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 <body>
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<h1>{{page.title}}</h1>
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{{if message}}
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<div style="background-color: #99f">{{message}}</div>
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{{endif}}
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<div>{{page.content|html}}</div>
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<hr>
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<a href="{{req.url}}?action=edit">Edit</a>
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 </body>
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</html>
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""")
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EDIT_TEMPLATE = HTMLTemplate("""\
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<html>
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 <head>
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  <title>Edit: {{page.title}}</title>
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 </head>
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 <body>
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{{if page.exists}}
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<h1>Edit: {{page.title}}</h1>
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{{else}}
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<h1>Create: {{page.title}}</h1>
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{{endif}}
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<form action="{{req.path_url}}" method="POST">
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 <input type="hidden" name="mtime" value="{{page.mtime}}">
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 Title: <input type="text" name="title" style="width: 70%" value="{{page.title}}"><br>
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 Content: <input type="submit" value="Save"> 
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 <a href="{{req.path_url}}">Cancel</a>
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   <br>
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 <textarea name="content" style="width: 100%; height: 75%" rows="40">{{page.content}}</textarea>
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   <br>
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 <input type="submit" value="Save">
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 <a href="{{req.path_url}}">Cancel</a>
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</form>
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</body></html>
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""")
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class WikiApp(object):
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    view_template = VIEW_TEMPLATE
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    edit_template = EDIT_TEMPLATE
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    def __init__(self, storage_dir):
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        self.storage_dir = os.path.abspath(os.path.normpath(storage_dir))
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    def __call__(self, environ, start_response):
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        req = Request(environ)
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        action = req.params.get('action', 'view')
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        page = self.get_page(req.path_info)
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        try:
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            try:
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                meth = getattr(self, 'action_%s_%s' % (action, req.method))
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            except AttributeError:
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                raise exc.HTTPBadRequest('No such action %r' % action).exception
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            resp = meth(req, page)
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        except exc.HTTPException, e:
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            resp = e
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        return resp(environ, start_response)
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    def get_page(self, path):
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        path = path.lstrip('/')
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        if not path:
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            path = 'index'
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        path = os.path.join(self.storage_dir)
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        path = os.path.normpath(path)
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        if path.endswith('/'):
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            path += 'index'
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        if not path.startswith(self.storage_dir):
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            raise exc.HTTPBadRequest("Bad path").exception
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        path += '.html'
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        return Page(path)
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    def action_view_GET(self, req, page):
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        if not page.exists:
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            return exc.HTTPTemporaryRedirect(
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                location=req.url + '?action=edit')
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        if req.cookies.get('message'):
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            message = req.cookies['message']
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        else:
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            message = None
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        text = self.view_template.substitute(
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            page=page, req=req, message=message)
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        resp = Response(text)
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        if message:
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            resp.delete_cookie('message')
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        else:
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            resp.last_modified = page.mtime
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            resp.conditional_response = True
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        return resp
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    def action_view_POST(self, req, page):
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        submit_mtime = int(req.params.get('mtime') or '0') or None
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        if page.mtime != submit_mtime:
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            return exc.HTTPPreconditionFailed(
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                "The page has been updated since you started editing it")
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        page.set(
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            title=req.params['title'],
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            content=req.params['content'])
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        resp = exc.HTTPSeeOther(
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            location=req.path_url)
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        resp.set_cookie('message', 'Page updated')
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        return resp
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    def action_edit_GET(self, req, page):
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        text = self.edit_template.substitute(
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            page=page, req=req)
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        return Response(text)
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class Page(object):
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    def __init__(self, filename):
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        self.filename = filename
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    @property
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    def exists(self):
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        return os.path.exists(self.filename)
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    @property
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    def title(self):
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        if not self.exists:
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            # we need to guess the title
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            basename = os.path.splitext(os.path.basename(self.filename))[0]
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            basename = re.sub(r'[_-]', ' ', basename)
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            return basename.capitalize()
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        content = self.full_content
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        match = re.search(r'<title>(.*?)</title>', content, re.I|re.S)
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        return match.group(1)
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    @property
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    def full_content(self):
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        f = open(self.filename, 'rb')
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        try:
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            return f.read()
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        finally:
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            f.close()
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    @property
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    def content(self):
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        if not self.exists:
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            return ''
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        content = self.full_content
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        match = re.search(r'<body[^>]*>(.*?)</body>', content, re.I|re.S)
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        return match.group(1)
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    @property
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    def mtime(self):
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        if not self.exists:
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            return None
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        else:
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            return os.stat(self.filename).st_mtime
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    def set(self, title, content):
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        dir = os.path.dirname(self.filename)
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        if not os.path.exists(dir):
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            os.makedirs(dir)
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        new_content = """<html><head><title>%s</title></head><body>%s</body></html>""" % (
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            title, content)
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        f = open(self.filename, 'wb')
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        f.write(new_content)
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        f.close()
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if __name__ == '__main__':
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    import optparse
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    parser = optparse.OptionParser(
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        usage='%prog --port=PORT'
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        )
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    parser.add_option(
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        '-p', '--port',
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        default='8080',
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        dest='port',
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        type='int',
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        help='Port to serve on (default 8080)')
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   186
    parser.add_option(
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        '--wiki-data',
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        default='./wiki',
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        dest='wiki_data',
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        help='Place to put wiki data into (default ./wiki/)')
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   191
    options, args = parser.parse_args()
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   192
    print 'Writing wiki pages to %s' % options.wiki_data
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   193
    app = WikiApp(options.wiki_data)
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   194
    from wsgiref.simple_server import make_server
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   195
    httpd = make_server('localhost', options.port, app)
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   196
    print 'Serving on http://localhost:%s' % options.port
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   197
    try:
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   198
        httpd.serve_forever()
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   199
    except KeyboardInterrupt:
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   200
        print '^C'