author | Tero Marttila <terom@qmsk.net> |
Fri, 03 Oct 2014 21:07:59 +0300 | |
changeset 152 | 7bd8d6062c9e |
parent 146 | 0f2a918eb90a |
child 164 | e1e0c8099c8b |
permissions | -rw-r--r-- |
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from werkzeug import Request, Response, exceptions |
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from werkzeug.utils import html |
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import werkzeug.urls |
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import pypngtile |
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import os.path |
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def url (server, *path, **args): |
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""" |
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>>> url('http://foo/', 'bar, 'quux.png', x=5, y=2) |
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'http://foo/bar/quux.png?x=5&y=2' |
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""" |
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|
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return werkzeug.urls.Href(server)(*path, **args) |
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class BaseApplication (object): |
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IMAGE_TYPES = ( |
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'png', |
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) |
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def __init__ (self, image_root): |
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if not os.path.isdir(image_root) : |
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raise Exception("Given image_root does not exist: {image_root}".format(image_root=image_root)) |
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self.image_root = os.path.abspath(image_root) |
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self.image_cache = { } |
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def lookup_path (self, url): |
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""" |
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Lookup image by request path. |
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Returns name, path. |
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""" |
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|
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if not os.path.isdir(self.image_root): |
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raise exceptions.InternalServerError("Server image_root has gone missing") |
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# path to image |
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name = url.lstrip('/') |
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# build absolute path |
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path = os.path.abspath(os.path.join(self.image_root, name)) |
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# ensure the path points inside the data root |
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if not path.startswith(self.image_root): |
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raise exceptions.NotFound(name) |
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|
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if not os.path.exists(path): |
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raise exceptions.NotFound(name) |
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|
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return name, path |
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def get_image (self, url): |
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""" |
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Return Image object. |
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""" |
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name, path = self.lookup_path(url) |
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|
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if os.path.isdir(path): |
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raise exceptions.BadRequest("Is a directory: {name}".format(name=name)) |
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|
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basename, file_type = path.rsplit('.', 1) |
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|
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if file_type not in self.IMAGE_TYPES: |
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raise exceptions.BadRequest("Not a supported image: {name}: {type}".format(name=name, type=file_type)) |
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# get Image object |
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image = self.image_cache.get(path) |
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|
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if not image: |
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# open |
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image = pypngtile.Image(path) |
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# check |
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if image.status() not in (pypngtile.CACHE_FRESH, pypngtile.CACHE_STALE): |
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raise exceptions.InternalServerError("Image cache not available: {name}".format(name=name)) |
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# load |
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image.open() |
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# cache |
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self.image_cache[path] = image |
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return image, name |
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|
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def handle (self, request): |
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""" |
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Handle request for an image |
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""" |
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|
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raise NotImplementedError() |
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|
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@Request.application |
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def __call__ (self, request): |
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""" |
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WSGI entry point. |
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""" |
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|
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try: |
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return self.handle(request) |
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|
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except exceptions.HTTPException as error: |
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return error |
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|
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STYLESHEETS = ( ) |
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SCRIPTS = ( ) |
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def render_html (self, title, body, stylesheets=None, scripts=None, end=()): |
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if stylesheets is None: |
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113 |
stylesheets = self.STYLESHEETS |
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parents:
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114 |
|
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115 |
if scripts is None: |
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parents:
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116 |
scripts = self.SCRIPTS |
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parents:
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117 |
|
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parents:
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118 |
return html.html(lang='en', *[ |
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parents:
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119 |
html.head( |
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parents:
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120 |
html.title(title), |
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parents:
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121 |
*[ |
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parents:
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122 |
html.link(rel='stylesheet', href=href) for href in stylesheets |
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parents:
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123 |
] |
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Tero Marttila <terom@paivola.fi>
parents:
diff
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124 |
), |
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Tero Marttila <terom@paivola.fi>
parents:
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|
125 |
html.body( |
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parents:
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126 |
*(body + tuple( |
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Tero Marttila <terom@paivola.fi>
parents:
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127 |
html.script(src=src) for src in scripts |
139
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pngtile.application: BaseApplication.render_html(end=...) to place scripts at end of body, after script-src's
Tero Marttila <terom@paivola.fi>
parents:
138
diff
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128 |
) + end) |
138
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parents:
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129 |
), |
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Tero Marttila <terom@paivola.fi>
parents:
diff
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|
130 |
]) |
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Tero Marttila <terom@paivola.fi>
parents:
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changeset
|
131 |
|
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parents:
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132 |