apache-tuscany/sca-cpp/trunk/hosting/server/icons.py

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#  to you under the Apache License, Version 2.0 (the
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#  
#    http://www.apache.org/licenses/LICENSE-2.0
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#  under the License.

# App icons collection implementation
from util import *
from atomutil import *
from imgutil import *
from sys import debug

# Convert an id to an icon id
def iconid(id):
    return ("apps", car(id), "app.icon")

# Put an icon
def put(id, icon, user, cache, apps):
    debug('icons.py::put::id', id)
    debug('icons.py::put::icon', icon)

    # Get the requested app
    app = apps.get(id)
    if isNull(app):
        debug('icons.py::put', 'app not found', id)
        return False

    # Check app author
    if author(app) != user.get(()) and user.get(()) != 'admin':
        debug('icons.py::put', 'different author', author(app))
        return False

    # Get image and token from input icon
    def image(c):
        img = assoc("'image", c)
        return None if isNull(img) else urlto50x50jpeg(cadr(img))
    def token(c):
        tok = assoc("'token", c)
        return None if isNull(tok) else cadr(tok)
    img = image(content(icon))
    tok = token(content(icon))

    # Update the icon
    # Put with an upload token
    if not isNull(tok):
        debug('icons.py::put::token', tok)

        # Token alone, store token with existing image, if any
        if isNull(img):
            eicon = cache.get(iconid(id))
            eimg = None if isNull(eicon) else image(content(eicon))
            if isNull(eimg):
                iconentry = mkentry(title(app), car(id), author(app), now(), ("'icon", ("'token", tok)))
                debug('icons.py::put::iconentry', iconentry)
                return cache.put(iconid(id), iconentry)

            debug('icons.py::put::eimg', eimg)
            iconentry = mkentry(title(app), car(id), author(app), now(), ("'icon", ("'image", eimg), ("'token", tok)))
            debug('icons.py::put::iconentry', iconentry)
            return cache.put(iconid(id), iconentry)

        # Token plus image, put image if token is valid, removing the token
        debug('icons.py::put::img', img)
        eicon = cache.get(iconid(id))
        etok = None if isNull(eicon) else token(content(eicon))
        debug('icons.py::put::etok', etok)
        if isNull(etok) or tok != etok:
            debug('icons.py::put', 'invalid token', tok)
            return False

        iconentry = mkentry(title(app), car(id), author(app), now(), ("'icon", ("'image", img)))
        debug('icons.py::put::iconentry', iconentry)
        return cache.put(iconid(id), iconentry)

    # Update icon image
    if not isNull(img):
        debug('icons.py::put::img', img)
        iconentry = mkentry(title(app), car(id), author(app), now(), ("'icon", ("'image", img)))
        debug('icons.py::put::iconentry', iconentry)
        rc = cache.put(iconid(id), iconentry)
        if rc == False:
            return False

        # Update the app's updated date
        return apps.put(id, app)

    # Put default empty icon
    iconentry = mkentry(title(app), car(id), author(app), now(), ())
    debug('icons.py::put::iconentry', iconentry)
    rc = cache.put(iconid(id), iconentry)
    if rc == False:
        return False

    # Update the app's updated date
    return apps.put(id, app)

# Get an icon
def get(id, user, cache, apps):
    debug('icons.py::get::id', id)
    if isNull(id):
        return (("'feed", ("'title", "Icons"), ("'id", "icons")),)

    # Get the requested app
    app = apps.get(id)
    if isNull(app):
        debug('icons.py::get', 'app not found', id)

        # Return a default new icon
        return mkentry(car(id), car(id), user.get(()), now(), ())

    # Get the requested icon
    icon = cache.get(iconid(id))
    if isNull(icon):
        debug('icons.py::get', 'icon not found', id)

        # Return a default new icon
        return mkentry(title(app), car(id), author(app), now(), ())

    # Get image, token, and updated date from icon
    def image(c):
        img = assoc("'image", c)
        return None if isNull(img) else cadr(img)
    def token(c):
        tok = assoc("'token", c)
        return None if isNull(tok) else cadr(tok)
    img = image(content(icon))
    tok = token(content(icon))

    # Return the icon
    iconc = (() if isNull(img) else (("'image", img),)) + (() if isNull(tok) or (user.get(()) != author(app) and user.get(()) != 'admin') else (("'token", tok),))
    if isNull(iconc):
        iconentry = mkentry(title(app), car(id), author(app), updated(icon), ())
        debug('icons.py::get::iconentry', iconentry)
        return iconentry

    iconentry = mkentry(title(app), car(id), author(app), updated(icon), ("'icon",) + iconc)
    debug('icons.py::get::iconentry', iconentry)
    return iconentry

# Delete an icon
def delete(id, user, cache, apps):
    debug('icons.py::delete::id', id)

    # Get the requested app
    app = apps.get(id)
    if isNull(app):
        debug('icons.py::delete', 'app not found', id)
        return False

    # Check app author
    if author(app) != user.get(()):
        debug('icons.py::delete', 'different author', author(app))
        return False

    # Delete the icon
    rc = cache.delete(iconid(id))
    if rc == False:
        return False

    # Update the app's updated date
    return apps.put(id, app)