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by Chris

created 2017-04-19 22:06 UTC

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# -*- coding: utf-8 -*-

"""
flask_jsondash.charts_builder
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

The chart blueprint that houses all functionality.

:copyright: (c) 2016 by Chris Tabor.
:license: MIT, see LICENSE for more details.
"""

import json
import os
import uuid
from collections import namedtuple
from datetime import datetime as dt

import jinja2
from flask import (Blueprint, current_app, flash, redirect, render_template,
                   request, send_from_directory, url_for)

from flask_jsondash import static, templates

from . import db
from .settings import CHARTS_CONFIG

template_dir = os.path.dirname(templates.__file__)
static_dir = os.path.dirname(static.__file__)

# Internally required libs that are also shared in `settings.py` for charts.
# These follow the same format as what is loaded in `get_active_assets`
# so that shared libraries are loaded in the same manner for simplicty
# and prevention of duplicate loading. Note these are just LABELS, not files.
REQUIRED_STATIC_FAMILES = ['D3']

Paginator = namedtuple('Paginator',
                       'count per_page curr_page num_pages limit skip')

charts = Blueprint(
    'jsondash',
    __name__,
    template_folder=template_dir,
    static_url_path=static_dir,
    static_folder=static_dir,
)
default_config = dict(
    JSONDASH_FILTERUSERS=False,
    JSONDASH_GLOBALDASH=False,
    JSONDASH_GLOBAL_USER='global',
    JSONDASH_PERPAGE=25,
)
adapter = db.get_db_handler()


class InvalidSchemaError(ValueError):
    """Wrapper exception for specific raising scenarios."""


def auth(**kwargs):
    """Check if general auth functions have been specified.

    Checks for either a global auth (if authtype is None), or
    an action specific auth (specified by authtype).
    """
    if 'JSONDASH' not in current_app.config:
        return True
    if 'auth' not in current_app.config['JSONDASH']:
        return True
    authtype = kwargs.pop('authtype')
    auth_conf = current_app.config.get('JSONDASH').get('auth')
    # If the user didn't supply an auth function, assume true.
    if authtype not in auth_conf:
        return True
    # Only perform the user-supplied check
    # if the authtype is actually enabled.
    return auth_conf[authtype](**kwargs)


def metadata(key=None, exclude=[]):
    """An abstraction around misc. metadata.

    This allows loose coupling for enabling and setting
    metadata for each chart.
    """
    _metadata = dict()
    conf = current_app.config
    conf_metadata = conf.get('JSONDASH', {}).get('metadata')
    # Also useful for getting arbitrary configuration keys.
    if key is not None:
        if key in conf_metadata:
            return conf_metadata[key]()
        else:
            return None
    # Update all metadata values if the function exists.
    for k, func in conf_metadata.items():
        if k in exclude:
            continue
        _metadata[k] = conf_metadata[k]()
    return _metadata


def setting(name, default=None):
    """A simplified getter for namespaced flask config values."""
    if default is None:
        default = default_config.get(name)
    return current_app.config.get(name, default)


def local_static(chart_config, static_config):
    """Convert remote cdn urls to local urls, based on user provided paths.

    The filename must be identical to the one specified in the
    `settings.py` configuration.

    So, for example:
    '//cdnjs.cloudflare.com/foo/bar/foo.js'
    becomes
    '/static/js/vendor/foo.js'
    """
    js_path = static_config.get('js_path')
    css_path = static_config.get('css_path')
    for family, config in chart_config.items():
        if config['js_url']:
            for i, url in enumerate(config['js_url']):
                url = '{}{}'.format(js_path, url.split('/')[-1])
                config['js_url'][i] = url_for('static', filename=url)
        if config['css_url']:
            for i, url in enumerate(config['css_url']):
                url = '{}{}'.format(css_path, url.split('/')[-1])
                config['css_url'][i] = url_for('static', filename=url)
    return chart_config


@charts.context_processor
def ctx():
    """Inject any context needed for this blueprint."""
    filter_user = setting('JSONDASH_FILTERUSERS')
    static = setting('JSONDASH').get('static')
    # Rewrite the static config paths to be local if the overrides are set.
    config = (CHARTS_CONFIG if not static
              else local_static(CHARTS_CONFIG, static))
    return dict(
        static_config=static,
        charts_config=config,
        page_title='dashboards',
        docs_url=('https://github.com/christabor/flask_jsondash/'
                  'blob/master/docs/'),
        demo_mode=request.args.get('jsondash_demo_mode', False),
        global_dashuser=setting('JSONDASH_GLOBAL_USER'),
        global_dashboards=setting('JSONDASH_GLOBALDASH'),
        username=metadata(key='username') if filter_user else None,
        filter_dashboards=filter_user,
    )


@jinja2.contextfilter
@charts.app_template_filter('get_dims')
def get_dims(_, config):
    """Extract the dimensions from config data. This allows
    for overrides for edge-cases to live in one place.
    """
    if not all([
        'width' in config,
        'height' in config,
        'dataSource' in config,
        config.get('dataSource') != '',
        config.get('dataSource') is not None,
    ]):
        raise ValueError('Invalid config!')
    fixed_layout = str(config.get('width')).startswith('col-')
    if config.get('type') == 'youtube':
        # Override all width settings if fixed grid layout
        if fixed_layout:
            width = config['width'].replace('col-', '')
            return dict(width=width, height=int(config['height']))
        # We get the dimensions for the widget from YouTube instead,
        # which handles aspect ratios, etc... and is likely what the user
        # wanted to specify since they will be entering in embed code from
        # Youtube directly.
        padding_w = 20
        padding_h = 60
        embed = config['dataSource'].split(' ')
        w = int(embed[1].replace('width=', '').replace('"', ''))
        h = int(embed[2].replace('height=', '').replace('"', ''))
        return dict(width=w + padding_w, height=h + padding_h)
    return dict(width=config['width'], height=config['height'])


@jinja2.contextfilter
@charts.app_template_filter('jsonstring')
def jsonstring(ctx, data):
    """Format view json module data for template use.

    It's automatically converted to unicode key/value pairs,
    which is undesirable for the template.
    """
    if 'date' in data:
        data['date'] = str(data['date'])
    return json.dumps(data)


@charts.route('/jsondash/<path:filename>')
def _static(filename):
    """Send static files directly for this blueprint."""
    return send_from_directory(static_dir, filename)


def get_all_assets():
    """Load ALL asset files for css/js from config."""
    cssfiles, jsfiles = [], []
    for c in CHARTS_CONFIG.values():
        if c['css_url'] is not None:
            cssfiles += c['css_url']
        if c['js_url'] is not None:
            jsfiles += c['js_url']
    return dict(
        css=cssfiles,
        js=jsfiles
    )


def get_active_assets(families):
    """Given a list of chart families, determine what needs to be loaded."""
    families += REQUIRED_STATIC_FAMILES  # Always load internal, shared libs.
    assets = dict(css=[], js=[])
    families = set(families)
    for family, data in CHARTS_CONFIG.items():
        if family in families:
            # Also add all dependency assets.
            if data['dependencies']:
                for dep in data['dependencies']:
                    assets['css'] += [
                        css for css in CHARTS_CONFIG[dep]['css_url']
                        if css not in assets['css']]

                    assets['js'] += [
                        js for js in CHARTS_CONFIG[dep]['js_url']
                        if js not in assets['js']
                    ]
            assets['css'] += [
                css for css in data['css_url'] if css not in assets['css']]
            assets['js'] += [
                js for js in data['js_url'] if js not in assets['js']]
    assets['css'] = list(assets['css'])
    assets['js'] = list(assets['js'])
    return assets


def paginator(page=0, per_page=None, count=None):
    """Get pagination calculations in a compact format."""
    if count is None:
        count = adapter.count()
    if page is None:
        page = 0
    default_per_page = setting('JSONDASH_PERPAGE')
    # Allow query parameter overrides.
    per_page = per_page if per_page is not None else default_per_page
    per_page = per_page if per_page > 2 else 2  # Prevent division errors etc
    curr_page = page - 1 if page > 0 else 0
    num_pages = count // per_page
    rem = count % per_page
    extra_pages = 2 if rem else 1
    pages = list(range(1, num_pages + extra_pages))
    return Paginator(
        limit=per_page,
        per_page=per_page,
        curr_page=curr_page,
        skip=curr_page * per_page,
        num_pages=pages,
        count=count,
    )


def get_num_rows(viewconf):
    """Get the number of rows for a layout if it's using fixed grid format."""
    layout = viewconf.get('layout', 'freeform')
    if layout == 'freeform':
        return None
    return len([m['row'] for m in viewconf.get('modules')])


def order_sort(item):
    """Attempt to sort modules by order keys.

    Always returns an integer for compatibility.
    """
    if item.get('order') is not None:
        try:
            return int(item['order'])
        except (ValueError, TypeError):
            return -1
    return -1


def sort_modules(viewjson):
    """Sort module data in various ways.

    If the layout is freeform, sort by default order in a shallow list.
    If the layout is fixed grid, sort by default order, nested in a list
        for each row - e.g. [[{}, {}], [{}]]
        for row 1 (2 modules) and row 2 (1 module)
    """
    items = sorted(viewjson['modules'], key=order_sort)
    if viewjson.get('layout', 'freeform') == 'freeform':
        return items
    # Sort them by and group them by rows if layout is fixed grid
    # Create a temporary dict to hold the number of rows
    modules = {int(item['row']) - 1: [] for item in items}.values()
    for module in items:
        modules[int(module['row']) - 1].append(module)
    return modules


@charts.route('/charts', methods=['GET'])
@charts.route('/charts/', methods=['GET'])
def dashboard():
    """Load all views."""
    opts = dict()
    views = []
    if setting('JSONDASH_FILTERUSERS'):
        opts.update(filter=dict(created_by=metadata(key='username')))
        views = list(adapter.read(**opts))
        if setting('JSONDASH_GLOBALDASH'):
            opts.update(
                filter=dict(created_by=setting('JSONDASH_GLOBAL_USER')))
            views += list(adapter.read(**opts))
    else:
        views = list(adapter.read(**opts))
    if views:
        page = request.args.get('page')
        per_page = request.args.get('per_page')
        paginator_args = dict(count=len(views))
        if per_page is not None:
            paginator_args.update(per_page=int(per_page))
        if page is not None:
            paginator_args.update(page=int(page))
        pagination = paginator(**paginator_args)
        opts.update(limit=pagination.limit, skip=pagination.skip)
    else:
        pagination = None
    kwargs = dict(
        views=views,
        view=None,
        paginator=pagination,
        creating=True,
        can_edit_global=auth(authtype='edit_global'),
        total_modules=sum([
            len(view.get('modules', [])) for view in views
            if isinstance(view, dict)
        ]),
    )
    return render_template('pages/charts_index.html', **kwargs)


@charts.route('/charts/<c_id>', methods=['GET'])
def view(c_id):
    """Load a json view config from the DB."""
    if not auth(authtype='view', view_id=c_id):
        flash('You do not have access to view this dashboard.', 'error')
        return redirect(url_for('jsondash.dashboard'))
    viewjson = adapter.read(c_id=c_id)
    if not viewjson:
        flash('Could not find view: {}'.format(c_id), 'error')
        return redirect(url_for('jsondash.dashboard'))
    # Remove _id, it's not JSON serializeable.
    if '_id' in viewjson:
        viewjson.pop('_id')
    if 'modules' not in viewjson:
        flash('Invalid configuration - missing modules.', 'error')
        return redirect(url_for('jsondash.dashboard'))
    # Chart family is encoded in chart type value for lookup.
    active_charts = [v.get('family') for v in viewjson['modules']
                     if v.get('family') is not None]
    # If the logged in user is also the creator of this dashboard,
    # let me edit it. Otherwise, defer to any user-supplied auth function
    # for this specific view.
    if metadata(key='username') == viewjson.get('created_by'):
        can_edit = True
    else:
        can_edit = auth(authtype='edit_others', view_id=c_id)
    # Backwards compatible layout type
    layout_type = viewjson.get('layout', 'freeform')
    kwargs = dict(
        id=c_id,
        view=viewjson,
        num_rows=None if layout_type == 'freeform' else get_num_rows(viewjson),
        modules=sort_modules(viewjson),
        assets=get_active_assets(active_charts),
        can_edit=can_edit,
        can_edit_global=auth(authtype='edit_global'),
        is_global=is_global_dashboard(viewjson),
    )
    return render_template('pages/chart_detail.html', **kwargs)


@charts.route('/charts/<c_id>/delete', methods=['POST'])
def delete(c_id):
    """Delete a json dashboard config."""
    dash_url = url_for('jsondash.dashboard')
    if not auth(authtype='delete'):
        flash('You do not have access to delete dashboards.', 'error')
        return redirect(dash_url)
    adapter.delete(c_id)
    flash('Deleted dashboard "{}"'.format(c_id))
    return redirect(dash_url)


def validate_raw_json(jsonstr):
    """Validate the raw json for a config."""
    data = json.loads(jsonstr)
    layout = data.get('layout', 'freeform')
    main_required_fields = ['name', 'modules']
    for field in main_required_fields:
        if field not in data.keys():
            raise InvalidSchemaError('Missing "{}" key'.format(field))
    for module in data.get('modules'):
        required = ['family', 'name', 'width', 'height', 'dataSource', 'type']
        fixed_only_required = ['row']
        for field in required:
            if field not in module:
                raise InvalidSchemaError(
                    'Invalid JSON. "{}" must be '
                    'included in "{}"'.format(field, module))
        for field in fixed_only_required:
            if field not in module and layout == 'grid':
                raise InvalidSchemaError(
                    'Invalid JSON. "{}" must be '
                    'included in "{}" for '
                    'fixed grid layouts'.format(field, module))
    return data


@charts.route('/charts/<c_id>/update', methods=['POST'])
def update(c_id):
    """Normalize the form POST and setup the json view config object."""
    if not auth(authtype='update'):
        flash('You do not have access to update dashboards.', 'error')
        return redirect(url_for('jsondash.dashboard'))
    viewjson = adapter.read(c_id=c_id)
    if not viewjson:
        flash('Could not find view: {}'.format(c_id), 'error')
        return redirect(url_for('jsondash.dashboard'))
    form_data = request.form
    view_url = url_for('jsondash.view', c_id=c_id)
    edit_raw = 'edit-raw' in request.form
    if edit_raw:
        try:
            data = validate_raw_json(form_data.get('config'))
            data = db.reformat_data(data, c_id)
        except InvalidSchemaError as e:
            flash(str(e), 'error')
            return redirect(view_url)
        except (TypeError, ValueError):
            flash('Invalid JSON config.', 'error')
            return redirect(view_url)
    else:
        data = dict(
            name=form_data['name'],
            modules=db.format_charts(form_data),
            date=str(dt.now()),
            id=c_id,
        )
    # Update metadata, but exclude some fields that should never
    # be overwritten by user, once the view has been created.
    data.update(**metadata(exclude=['created_by']))
    # Possibly override global user, if configured and valid.
    data.update(**check_global())
    # Update db
    if edit_raw:
        adapter.update(c_id, data=data, fmt_charts=False)
    else:
        adapter.update(c_id, data=data)
    flash('Updated view "{}"'.format(c_id))
    return redirect(view_url)


def is_global_dashboard(view):
    """Check if a dashboard is considered global."""
    return all([
        setting('JSONDASH_GLOBALDASH'),
        view.get('created_by') == setting('JSONDASH_GLOBAL_USER'),
    ])


def check_global():
    """Allow overriding of the user by making it global.
    This also checks if the setting is enabled for the app,
    otherwise it will not allow it.
    """
    global_enabled = setting('JSONDASH_GLOBALDASH')
    global_flag = request.form.get('is_global', '') == 'on'
    can_make_global = auth(authtype='edit_global')
    if all([global_flag, global_enabled, can_make_global]):
        return dict(created_by=setting('JSONDASH_GLOBAL_USER'))
    return dict()


@charts.route('/charts/create', methods=['POST'])
def create():
    """Normalize the form POST and setup the json view config object."""
    if not auth(authtype='create'):
        flash('You do not have access to create dashboards.', 'error')
        return redirect(url_for('jsondash.dashboard'))
    data = request.form
    new_id = str(uuid.uuid1())
    d = dict(
        name=data['name'],
        modules=db.format_charts(data),
        date=dt.now(),
        id=new_id,
        layout=data.get('mode', 'grid'),
    )
    d.update(**metadata())
    # Possibly override global user, if configured and valid.
    d.update(**check_global())
    # Add to DB
    adapter.create(data=d)
    flash('Created new dashboard "{}"'.format(data['name']))
    return redirect(url_for('jsondash.view', c_id=new_id))


@charts.route('/charts/<c_id>/clone', methods=['POST'])
def clone(c_id):
    """Clone a json view config from the DB."""
    if not auth(authtype='clone'):
        flash('You do not have access to clone dashboards.', 'error')
        return redirect(url_for('jsondash.dashboard'))
    viewjson = adapter.read(c_id=c_id)
    if not viewjson:
        flash('Could not find view: {}'.format(c_id), 'error')
        return redirect(url_for('jsondash.dashboard'))
    # Update some fields.
    newname = 'Clone of {}'.format(viewjson['name'])
    data = dict(
        name=newname,
        modules=viewjson['modules'],
        date=str(dt.now()),
        id=str(uuid.uuid1()),
        layout=viewjson['layout'],
    )
    data.update(**metadata())
    # Add to DB
    adapter.create(data=data)
    flash('Created new dashboard clone "{}"'.format(newname))
    return redirect(url_for('jsondash.view', c_id=data['id']))


1			# -- coding: utf-8 --
2
3			"""
4			flask_jsondash.charts_builder
5			~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
6
7			The chart blueprint that houses all functionality.
8
9			:copyright: (c) 2016 by Chris Tabor.
10			:license: MIT, see LICENSE for more details.
11			"""
12
13			import json
14			import os
15			import uuid
16			from collections import namedtuple
17			from datetime import datetime as dt
18
19			import jinja2
20			from flask import (Blueprint, current_app, flash, redirect, render_template,
21			request, send_from_directory, url_for)
22
23			from flask_jsondash import static, templates
24
25			from . import db
26			from .settings import CHARTS_CONFIG
27
28			template_dir = os.path.dirname(templates.__file__)
29			static_dir = os.path.dirname(static.__file__)
30
31			# Internally required libs that are also shared in `settings.py` for charts.
32			# These follow the same format as what is loaded in `get_active_assets`
33			# so that shared libraries are loaded in the same manner for simplicty
34			# and prevention of duplicate loading. Note these are just LABELS, not files.
35			REQUIRED_STATIC_FAMILES = ['D3']
36
37			Paginator = namedtuple('Paginator',
38			'count per_page curr_page num_pages limit skip')
39
40			charts = Blueprint(
41			'jsondash',
42			__name__,
43			template_folder=template_dir,
44			static_url_path=static_dir,
45			static_folder=static_dir,
46			)
47			default_config = dict(
48			JSONDASH_FILTERUSERS=False,
49			JSONDASH_GLOBALDASH=False,
50			JSONDASH_GLOBAL_USER='global',
51			JSONDASH_PERPAGE=25,
52			)
53			adapter = db.get_db_handler()
54
55
56			class InvalidSchemaError(ValueError):
57			"""Wrapper exception for specific raising scenarios."""
58
59
60			def auth(**kwargs):
61			"""Check if general auth functions have been specified.
62
63			Checks for either a global auth (if authtype is None), or
64			an action specific auth (specified by authtype).
65			"""
66			if 'JSONDASH' not in current_app.config:
67			return True
68			if 'auth' not in current_app.config['JSONDASH']:
69			return True
70			authtype = kwargs.pop('authtype')
71			auth_conf = current_app.config.get('JSONDASH').get('auth')
72			# If the user didn't supply an auth function, assume true.
73			if authtype not in auth_conf:
74			return True
75			# Only perform the user-supplied check
76			# if the authtype is actually enabled.
77			return auth_conf[authtype](**kwargs)
78
79
80			def metadata(key=None, exclude=[]):
81			"""An abstraction around misc. metadata.
82
83			This allows loose coupling for enabling and setting
84			metadata for each chart.
85			"""
86			_metadata = dict()
87			conf = current_app.config
88			conf_metadata = conf.get('JSONDASH', {}).get('metadata')
89			# Also useful for getting arbitrary configuration keys.
90			if key is not None:
91			if key in conf_metadata:
92			return conf_metadata[key]()
93			else:
94			return None
95			# Update all metadata values if the function exists.
96			for k, func in conf_metadata.items():
97			if k in exclude:
98			continue
99			_metadata[k] = conf_metadata[k]()
100			return _metadata
101
102
103			def setting(name, default=None):
104			"""A simplified getter for namespaced flask config values."""
105			if default is None:
106			default = default_config.get(name)
107			return current_app.config.get(name, default)
108
109
110			def local_static(chart_config, static_config):
111			"""Convert remote cdn urls to local urls, based on user provided paths.
112
113			The filename must be identical to the one specified in the
114			`settings.py` configuration.
115
116			So, for example:
117			'//cdnjs.cloudflare.com/foo/bar/foo.js'
118			becomes
119			'/static/js/vendor/foo.js'
120			"""
121			js_path = static_config.get('js_path')
122			css_path = static_config.get('css_path')
123			for family, config in chart_config.items():
124			if config['js_url']:
125			for i, url in enumerate(config['js_url']):
126			url = '{}{}'.format(js_path, url.split('/')[-1])
127			config['js_url'][i] = url_for('static', filename=url)
128			if config['css_url']:
129			for i, url in enumerate(config['css_url']):
130			url = '{}{}'.format(css_path, url.split('/')[-1])
131			config['css_url'][i] = url_for('static', filename=url)
132			return chart_config
133
134
135			@charts.context_processor
136			def ctx():
137			"""Inject any context needed for this blueprint."""
138			filter_user = setting('JSONDASH_FILTERUSERS')
139			static = setting('JSONDASH').get('static')
140			# Rewrite the static config paths to be local if the overrides are set.
141			config = (CHARTS_CONFIG if not static
142			else local_static(CHARTS_CONFIG, static))
143			return dict(
144			static_config=static,
145			charts_config=config,
146			page_title='dashboards',
147			docs_url=('https://github.com/christabor/flask_jsondash/'
148			'blob/master/docs/'),
149			demo_mode=request.args.get('jsondash_demo_mode', False),
150			global_dashuser=setting('JSONDASH_GLOBAL_USER'),
151			global_dashboards=setting('JSONDASH_GLOBALDASH'),
152			username=metadata(key='username') if filter_user else None,
153			filter_dashboards=filter_user,
154			)
155
156
157			@jinja2.contextfilter
158			@charts.app_template_filter('get_dims')
159			def get_dims(_, config):
160			"""Extract the dimensions from config data. This allows
161			for overrides for edge-cases to live in one place.
162			"""
163			if not all([
164			'width' in config,
165			'height' in config,
166			'dataSource' in config,
167			config.get('dataSource') != '',
168			config.get('dataSource') is not None,
169			]):
170			raise ValueError('Invalid config!')
171			fixed_layout = str(config.get('width')).startswith('col-')
172			if config.get('type') == 'youtube':
173			# Override all width settings if fixed grid layout
174			if fixed_layout:
175			width = config['width'].replace('col-', '')
176			return dict(width=width, height=int(config['height']))
177			# We get the dimensions for the widget from YouTube instead,
178			# which handles aspect ratios, etc... and is likely what the user
179			# wanted to specify since they will be entering in embed code from
180			# Youtube directly.
181			padding_w = 20
182			padding_h = 60
183			embed = config['dataSource'].split(' ')
184			w = int(embed[1].replace('width=', '').replace('"', ''))
185			h = int(embed[2].replace('height=', '').replace('"', ''))
186			return dict(width=w + padding_w, height=h + padding_h)
187			return dict(width=config['width'], height=config['height'])
188
189
190			@jinja2.contextfilter
191			@charts.app_template_filter('jsonstring')
192			def jsonstring(ctx, data):
193			"""Format view json module data for template use.
194
195			It's automatically converted to unicode key/value pairs,
196			which is undesirable for the template.
197			"""
198			if 'date' in data:
199			data['date'] = str(data['date'])
200			return json.dumps(data)
201
202
203			@charts.route('/jsondash/<path:filename>')
204			def _static(filename):
205			"""Send static files directly for this blueprint."""
206			return send_from_directory(static_dir, filename)
207
208
209			def get_all_assets():
210			"""Load ALL asset files for css/js from config."""
211			cssfiles, jsfiles = [], []
212			for c in CHARTS_CONFIG.values():
213			if c['css_url'] is not None:
214			cssfiles += c['css_url']
215			if c['js_url'] is not None:
216			jsfiles += c['js_url']
217			return dict(
218			css=cssfiles,
219			js=jsfiles
220			)
221
222
223			def get_active_assets(families):
224			"""Given a list of chart families, determine what needs to be loaded."""
225			families += REQUIRED_STATIC_FAMILES # Always load internal, shared libs.
226			assets = dict(css=[], js=[])
227			families = set(families)
228			for family, data in CHARTS_CONFIG.items():
229			if family in families:
230			# Also add all dependency assets.
231			if data['dependencies']:
232			for dep in data['dependencies']:
233			assets['css'] += [
234			css for css in CHARTS_CONFIG[dep]['css_url']
235			if css not in assets['css']]
236
237			assets['js'] += [
238			js for js in CHARTS_CONFIG[dep]['js_url']
239			if js not in assets['js']
240			]
241			assets['css'] += [
242			css for css in data['css_url'] if css not in assets['css']]
243			assets['js'] += [
244			js for js in data['js_url'] if js not in assets['js']]
245			assets['css'] = list(assets['css'])
246			assets['js'] = list(assets['js'])
247			return assets
248
249
250			def paginator(page=0, per_page=None, count=None):
251			"""Get pagination calculations in a compact format."""
252			if count is None:
253			count = adapter.count()
254			if page is None:
255			page = 0
256			default_per_page = setting('JSONDASH_PERPAGE')
257			# Allow query parameter overrides.
258			per_page = per_page if per_page is not None else default_per_page
259			per_page = per_page if per_page > 2 else 2 # Prevent division errors etc
260			curr_page = page - 1 if page > 0 else 0
261			num_pages = count // per_page
262			rem = count % per_page
263			extra_pages = 2 if rem else 1
264			pages = list(range(1, num_pages + extra_pages))
265			return Paginator(
266			limit=per_page,
267			per_page=per_page,
268			curr_page=curr_page,
269			skip=curr_page * per_page,
270			num_pages=pages,
271			count=count,
272			)
273
274
275			def get_num_rows(viewconf):
276			"""Get the number of rows for a layout if it's using fixed grid format."""
277			layout = viewconf.get('layout', 'freeform')
278			if layout == 'freeform':
279			return None
280			return len([m['row'] for m in viewconf.get('modules')])
281
282
283			def order_sort(item):
284			"""Attempt to sort modules by order keys.
285
286			Always returns an integer for compatibility.
287			"""
288			if item.get('order') is not None:
289			try:
290			return int(item['order'])
291			except (ValueError, TypeError):
292			return -1
293			return -1
294
295
296			def sort_modules(viewjson):
297			"""Sort module data in various ways.
298
299			If the layout is freeform, sort by default order in a shallow list.
300			If the layout is fixed grid, sort by default order, nested in a list
301			for each row - e.g. [[{}, {}], [{}]]
302			for row 1 (2 modules) and row 2 (1 module)
303			"""
304			items = sorted(viewjson['modules'], key=order_sort)
305			if viewjson.get('layout', 'freeform') == 'freeform':
306			return items
307			# Sort them by and group them by rows if layout is fixed grid
308			# Create a temporary dict to hold the number of rows
309			modules = {int(item['row']) - 1: [] for item in items}.values()
310			for module in items:
311			modules[int(module['row']) - 1].append(module)
312			return modules
313
314
315			@charts.route('/charts', methods=['GET'])
316			@charts.route('/charts/', methods=['GET'])
317			def dashboard():
318			"""Load all views."""
319			opts = dict()
320			views = []
321			if setting('JSONDASH_FILTERUSERS'):
322			opts.update(filter=dict(created_by=metadata(key='username')))
323			views = list(adapter.read(**opts))
324			if setting('JSONDASH_GLOBALDASH'):
325			opts.update(
326			filter=dict(created_by=setting('JSONDASH_GLOBAL_USER')))
327			views += list(adapter.read(**opts))
328			else:
329			views = list(adapter.read(**opts))
330			if views:
331			page = request.args.get('page')
332			per_page = request.args.get('per_page')
333			paginator_args = dict(count=len(views))
334			if per_page is not None:
335			paginator_args.update(per_page=int(per_page))
336			if page is not None:
337			paginator_args.update(page=int(page))
338			pagination = paginator(**paginator_args)
339			opts.update(limit=pagination.limit, skip=pagination.skip)
340			else:
341			pagination = None
342			kwargs = dict(
343			views=views,
344			view=None,
345			paginator=pagination,
346			creating=True,
347			can_edit_global=auth(authtype='edit_global'),
348			total_modules=sum([
349			len(view.get('modules', [])) for view in views
350			if isinstance(view, dict)
351			]),
352			)
353			return render_template('pages/charts_index.html', **kwargs)
354
355
356			@charts.route('/charts/<c_id>', methods=['GET'])
357			def view(c_id):
358			"""Load a json view config from the DB."""
359			if not auth(authtype='view', view_id=c_id):
360			flash('You do not have access to view this dashboard.', 'error')
361			return redirect(url_for('jsondash.dashboard'))
362			viewjson = adapter.read(c_id=c_id)
363			if not viewjson:
364			flash('Could not find view: {}'.format(c_id), 'error')
365			return redirect(url_for('jsondash.dashboard'))
366			# Remove _id, it's not JSON serializeable.
367			if '_id' in viewjson:
368			viewjson.pop('_id')
369			if 'modules' not in viewjson:
370			flash('Invalid configuration - missing modules.', 'error')
371			return redirect(url_for('jsondash.dashboard'))
372			# Chart family is encoded in chart type value for lookup.
373			active_charts = [v.get('family') for v in viewjson['modules']
374			if v.get('family') is not None]
375			# If the logged in user is also the creator of this dashboard,
376			# let me edit it. Otherwise, defer to any user-supplied auth function
377			# for this specific view.
378			if metadata(key='username') == viewjson.get('created_by'):
379			can_edit = True
380			else:
381			can_edit = auth(authtype='edit_others', view_id=c_id)
382			# Backwards compatible layout type
383			layout_type = viewjson.get('layout', 'freeform')
384			kwargs = dict(
385			id=c_id,
386			view=viewjson,
387			num_rows=None if layout_type == 'freeform' else get_num_rows(viewjson),
388			modules=sort_modules(viewjson),
389			assets=get_active_assets(active_charts),
390			can_edit=can_edit,
391			can_edit_global=auth(authtype='edit_global'),
392			is_global=is_global_dashboard(viewjson),
393			)
394			return render_template('pages/chart_detail.html', **kwargs)
395
396
397			@charts.route('/charts/<c_id>/delete', methods=['POST'])
398			def delete(c_id):
399			"""Delete a json dashboard config."""
400			dash_url = url_for('jsondash.dashboard')
401			if not auth(authtype='delete'):
402			flash('You do not have access to delete dashboards.', 'error')
403			return redirect(dash_url)
404			adapter.delete(c_id)
405			flash('Deleted dashboard "{}"'.format(c_id))
406			return redirect(dash_url)
407
408
409			def validate_raw_json(jsonstr):
410			"""Validate the raw json for a config."""
411			data = json.loads(jsonstr)
412			layout = data.get('layout', 'freeform')
413			main_required_fields = ['name', 'modules']
414			for field in main_required_fields:
415			if field not in data.keys():
416			raise InvalidSchemaError('Missing "{}" key'.format(field))
417			for module in data.get('modules'):
418			required = ['family', 'name', 'width', 'height', 'dataSource', 'type']
419			fixed_only_required = ['row']
420			for field in required:
421			if field not in module:
422			raise InvalidSchemaError(
423			'Invalid JSON. "{}" must be '
424			'included in "{}"'.format(field, module))
425			for field in fixed_only_required:
426			if field not in module and layout == 'grid':
427			raise InvalidSchemaError(
428			'Invalid JSON. "{}" must be '
429			'included in "{}" for '
430			'fixed grid layouts'.format(field, module))
431			return data
432
433
434			@charts.route('/charts/<c_id>/update', methods=['POST'])
435			def update(c_id):
436			"""Normalize the form POST and setup the json view config object."""
437			if not auth(authtype='update'):
438			flash('You do not have access to update dashboards.', 'error')
439			return redirect(url_for('jsondash.dashboard'))
440			viewjson = adapter.read(c_id=c_id)
441			if not viewjson:
442			flash('Could not find view: {}'.format(c_id), 'error')
443			return redirect(url_for('jsondash.dashboard'))
444			form_data = request.form
445			view_url = url_for('jsondash.view', c_id=c_id)
446			edit_raw = 'edit-raw' in request.form
447			if edit_raw:
448			try:
449			data = validate_raw_json(form_data.get('config'))
450			data = db.reformat_data(data, c_id)
451			except InvalidSchemaError as e:
452			flash(str(e), 'error')
453			return redirect(view_url)
454			except (TypeError, ValueError):
455			flash('Invalid JSON config.', 'error')
456			return redirect(view_url)
457			else:
458			data = dict(
459			name=form_data['name'],
460			modules=db.format_charts(form_data),
461			date=str(dt.now()),
462			id=c_id,
463			)
464			# Update metadata, but exclude some fields that should never
465			# be overwritten by user, once the view has been created.
466			data.update(**metadata(exclude=['created_by']))
467			# Possibly override global user, if configured and valid.
468			data.update(**check_global())
469			# Update db
470			if edit_raw:
471			adapter.update(c_id, data=data, fmt_charts=False)
472			else:
473			adapter.update(c_id, data=data)
474			flash('Updated view "{}"'.format(c_id))
475			return redirect(view_url)
476
477
478			def is_global_dashboard(view):
479			"""Check if a dashboard is considered global."""
480			return all([
481			setting('JSONDASH_GLOBALDASH'),
482			view.get('created_by') == setting('JSONDASH_GLOBAL_USER'),
483			])
484
485
486			def check_global():
487			"""Allow overriding of the user by making it global.
488			This also checks if the setting is enabled for the app,
489			otherwise it will not allow it.
490			"""
491			global_enabled = setting('JSONDASH_GLOBALDASH')
492			global_flag = request.form.get('is_global', '') == 'on'
493			can_make_global = auth(authtype='edit_global')
494			if all([global_flag, global_enabled, can_make_global]):
495			return dict(created_by=setting('JSONDASH_GLOBAL_USER'))
496			return dict()
497
498
499			@charts.route('/charts/create', methods=['POST'])
500			def create():
501			"""Normalize the form POST and setup the json view config object."""
502			if not auth(authtype='create'):
503			flash('You do not have access to create dashboards.', 'error')
504			return redirect(url_for('jsondash.dashboard'))
505			data = request.form
506			new_id = str(uuid.uuid1())
507			d = dict(
508			name=data['name'],
509			modules=db.format_charts(data),
510			date=dt.now(),
511			id=new_id,
512			layout=data.get('mode', 'grid'),
513			)
514			d.update(**metadata())
515			# Possibly override global user, if configured and valid.
516			d.update(**check_global())
517			# Add to DB
518			adapter.create(data=d)
519			flash('Created new dashboard "{}"'.format(data['name']))
520			return redirect(url_for('jsondash.view', c_id=new_id))
521
522
523			@charts.route('/charts/<c_id>/clone', methods=['POST'])
524			def clone(c_id):
525			"""Clone a json view config from the DB."""
526			if not auth(authtype='clone'):
527			flash('You do not have access to clone dashboards.', 'error')
528			return redirect(url_for('jsondash.dashboard'))
529			viewjson = adapter.read(c_id=c_id)
530			if not viewjson:
531			flash('Could not find view: {}'.format(c_id), 'error')
532			return redirect(url_for('jsondash.dashboard'))
533			# Update some fields.
534			newname = 'Clone of {}'.format(viewjson['name'])
535			data = dict(
536			name=newname,
537			modules=viewjson['modules'],
538			date=str(dt.now()),
539			id=str(uuid.uuid1()),
540			layout=viewjson['layout'],
541			)
542			data.update(**metadata())
543			# Add to DB
544			adapter.create(data=data)
545			flash('Created new dashboard clone "{}"'.format(newname))
546			return redirect(url_for('jsondash.view', c_id=data['id']))
547

christabor / flask_jsondash

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