billogram-v2-api-python-lib/billogram_api.py at develop · billogram/billogram-v2-api-python-lib · GitHub

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# encoding=utf-8

# Permission is hereby granted, free of charge, to any person obtaining a copy

# of this software and associated documentation files (the "Software"), to deal

# in the Software without restriction, including without limitation the rights

# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

# copies of the Software, and to permit persons to whom the Software is

# furnished to do so, subject to the following conditions:

# The above copyright notice and this permission notice shall be included in

# all copies or substantial portions of the Software.

# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE

# SOFTWARE.

"""

Library for accessing the Billogram v2 HTTP API.

Full documentation available at

[https://billogram.com/api/documentation](https://billogram.com/api/documentation)

"""

from __future__ import unicode_literals, print_function, division

import requests

import json

API_URL_BASE = "https://billogram.com/api/v2"

USER_AGENT = "Billogram API Python Library/1.00"

# python 2/3 intercompatibility

try:

unicode # not defined in py3k

def _printable_repr(s):

# python 2.7 can't handle unicode objects from __repr__

# so need this wrapper

return s.encode('utf-8')

except NameError:

basestring = str # py3k has no basestring type so fake one

def _printable_repr(s):

return s

class BillogramAPIError(Exception):

"Base class for errors from the Billogram API"

def __init__(self, message, **kwargs):

super(BillogramAPIError, self).__init__(message)

self.field = kwargs.get('field', None)

self.field_path = kwargs.get('field_path', None)

self.extra_data = kwargs

if 'field' in self.extra_data:

del self.extra_data['field']

if 'field_path' in self.extra_data:

del self.extra_data['field_path']

if not self.extra_data:

self.extra_data = None

class ServiceMalfunctioningError(BillogramAPIError):

"The Billogram API service seems to be malfunctioning"

pass

class RequestFormError(BillogramAPIError):

"Errors caused by malformed requests"

pass

class PermissionDeniedError(BillogramAPIError):

"No permission to perform the requested operation"

pass

class InvalidAuthenticationError(PermissionDeniedError):

"The user/key combination could not be authenticated"

pass

class NotAuthorizedError(PermissionDeniedError):

"The user does not have authorization to perform the requested operation"

pass

class RequestDataError(BillogramAPIError):

"Errors caused by bad data passed to request"

pass

class UnknownFieldError(RequestDataError):

"An unknown field was passed in the request data"

pass

class MissingFieldError(RequestDataError):

"A required field was missing from the request data"

pass

class InvalidFieldCombinationError(RequestDataError):

"Mutually exclusive fields were specified together"

pass

class InvalidFieldValueError(RequestDataError):

"A field was given an out-of-range value or a value of incorrect type"

pass

class ReadOnlyFieldError(RequestDataError):

"Attempt to modify a read-only field"

pass

class InvalidObjectStateError(RequestDataError):

"The request can not be performed on an object in this state"

pass

class ObjectNotFoundError(RequestDataError):

"No object by the requested ID exists"

pass

class ObjectNotAvailableYetError(ObjectNotFoundError):

"No object by the requested ID exists, but is expected to be created soon"

pass

class BillogramAPI(object):

"""Pseudo-connection to the Billogram v2 API

Objects of this class provide a call interface to the Billogram

v2 HTTP API.

"""

def __init__(self, auth_user, auth_key, user_agent=None, api_base=None):

"""Create a Billogram API connection object

Pass the API authentication in the auth_user and auth_key parameters.

API accounts can only be created from the Billogram web interface.

"""

self._auth = (auth_user, auth_key)

self._items = None

self._customers = None

self._billogram = None

self._settings = None

self._logotype = None

self._reports = None

self._user_agent = user_agent or USER_AGENT

self._api_base = api_base or API_URL_BASE

@property

def items(self):

"Provide access to the items database"

if self._items is None:

self._items = SimpleClass(self, 'item', 'item_no')

return self._items

@property

def customers(self):

"Provide access to the customer database"

if self._customers is None:

self._customers = SimpleClass(self, 'customer', 'customer_no')

return self._customers

@property

def billogram(self):

"Provide access to billogram objects and attached invoices"

if self._billogram is None:

self._billogram = BillogramClass(self)

return self._billogram

@property

def settings(self):

"Provide access to settings for the Billogram account"

if self._settings is None:

self._settings = SingletonObject(self, 'settings')

return self._settings

@property

def logotype(self):

"Provide access to the logotype for the Billogram account"

if self._logotype is None:

self._logotype = SingletonObject(self, 'logotype')

return self._logotype

@property

def reports(self):

"Provide access to the reports database"

if self._reports is None:

self._reports = SimpleClass(self, 'report', 'filename')

return self._reports

@classmethod

def _check_api_response(cls, resp, expect_content_type=None):

if not resp.ok or expect_content_type is None:

# if the request failed the response should always be json

expect_content_type = 'application/json'

if resp.status_code in range(500, 600):

# internal error

if resp.headers['content-type'] == expect_content_type and \

expect_content_type == 'application/json':

data = resp.json()

raise ServiceMalfunctioningError(

'Billogram API reported a server error: {} - {}'.format(

data.get('status'),

data.get('data').get('message')

)

raise ServiceMalfunctioningError(

'Billogram API reported a server error'

)

if resp.headers['content-type'] != expect_content_type:

# the service returned a different content-type from the expected,

# probably some malfunction on the remote end

if resp.headers['content-type'] == 'application/json':

data = resp.json()

if data.get('status') == 'NOT_AVAILABLE_YET':

raise ObjectNotAvailableYetError(

'Object not available yet'

)

raise ServiceMalfunctioningError(

'Billogram API returned unexpected content type'

)

if expect_content_type == 'application/json':

data = resp.json()

status = data.get('status')

if not status:

raise ServiceMalfunctioningError(

'Response data missing status field'

)

if not 'data' in data:

raise ServiceMalfunctioningError(

'Response data missing data field'

)

else:

# per above, non-json responses are always ok, so just return them

return resp.content

if resp.status_code == 403:

# bad auth

if status == 'PERMISSION_DENIED':

raise NotAuthorizedError(

'Not allowed to perform the requested operation'

)

elif status == 'INVALID_AUTH':

raise InvalidAuthenticationError(

'The user/key combination is wrong, check the credentials \

used and possibly generate a new set'

)

elif status == 'MISSING_AUTH':

raise RequestFormError('No authentication data was given')

else:

raise PermissionDeniedError(

'Permission denied, status={}'.format(

status

)

if resp.status_code == 404:

# not found

if data.get('status') == 'NOT_AVAILABLE_YET':

raise ObjectNotFoundError('Object not available yet')

raise ObjectNotFoundError('Object not found')

if resp.status_code == 405:

# bad http method

raise RequestFormError('Invalid HTTP method')

if status == 'OK':

return data

errordata = data.get('data', {})

raise {

'MISSING_QUERY_PARAMETER': RequestFormError,

'INVALID_QUERY_PARAMETER': RequestFormError,

'INVALID_PARAMETER': InvalidFieldValueError,

'INVALID_PARAMETER_COMBINATION': InvalidFieldCombinationError,

'READ_ONLY_PARAMETER': ReadOnlyFieldError,

'UNKNOWN_PARAMETER': UnknownFieldError,

'INVALID_OBJECT_STATE': InvalidObjectStateError,

}.get(status, RequestDataError)(**errordata)

def get(self, obj, params=None, expect_content_type=None):

"Perform a HTTP GET request to the Billogram API"

url = '{}/{}'.format(self._api_base, obj)

return self._check_api_response(

requests.get(

url,

auth=self._auth,

params=params,

headers={'user-agent': self._user_agent}

expect_content_type=expect_content_type

)

def post(self, obj, data):

"Perform a HTTP POST request to the Billogram API"

url = '{}/{}'.format(self._api_base, obj)

return self._check_api_response(

requests.post(

url,

auth=self._auth,

data=json.dumps(data),

headers={

'content-type': 'application/json',

'user-agent': self._user_agent

}

)

def put(self, obj, data):

"Perform a HTTP PUT request to the Billogram API"

url = '{}/{}'.format(self._api_base, obj)

return self._check_api_response(

requests.put(

url,

auth=self._auth,

data=json.dumps(data),

headers={

'content-type': 'application/json',

'user-agent': self._user_agent

}

)

def delete(self, obj):

"Perform a HTTP DELETE request to the Billogram API"

url = '{}/{}'.format(self._api_base, obj)

return self._check_api_response(

requests.delete(

url,

auth=self._auth,

headers={'user-agent': self._user_agent}

)

class SingletonObject(object):

"""Represents a remote singleton object on Billogram

Implements __getattr__ for dict-like access to the data of the remote

object, or use the 'data' property to access the backing dict object.

The data in this dict and all sub-objects should be treated as read-only,

the only way to change the remote object is through the 'update' method.

The represented object is initially "lazy" and will only be fetched on the

first access. If the remote data are changed, the local copy can be updated

bythe 'refresh' method.

See the online documentation for the actual structure of remote objects.

"""

def __init__(self, api, url_name):

self._api = api

self._object_class = url_name

self._data = None

__slots__ = ('_api', '_object_class', '_data')

def __getitem__(self, key):

"Dict-like access to object data"

return self.data[key]

def __repr__(self):

return _printable_repr(

"<Billogram object '{}'{}>".format(

self._url,

(self._data is None) and ' (lazy)' or ''

)

@property

def _url(self):

return self._object_class

@property

def data(self):

"Access the data of the actual object"

if self._data is None:

self.refresh()

return self._data

def refresh(self):

"Refresh the local copy of the object data from remote"

resp = self._api.get(self._url)

self._data = resp['data']

return self

def update(self, data):

"Modify the remote object with a partial or complete structure"

resp = self._api.put(self._url, data)

self._data = resp['data']

return self

class SimpleObject(SingletonObject):

"""Represents a remote object on the Billogram service

Implements __getattr__ for dict-like access to the data of the remote

object, or use the 'data' property to access the backing dict object.

The data in this dict and all sub-objects should be treated as read-only,

the only way to change the remote object is through the 'update' method.

If the remote data are changed, the local copy can be updated by

the 'refresh' method.

The 'delete' method can be used to remove the backing object.

See the online documentation for the actual structure of remote objects.

"""

def __init__(self, api, object_class, data):

self._api = api

self._object_class = object_class

self._data = data

__slots__ = ()

@property

def _url(self):

return self._object_class._url_of(self)

def __getattr__(self, key):

return self._data[key]

def delete(self):

"Remove the remote object from the database"

self._api.delete(self._url)

return None

class Query(object):

"""Builds queries and fetches pages of remote objects

Due to internal limitations in Billogram it is currently only possible to

filter on a single field or special query at a time. This may change in the

future. When it does the API will continue supporting the old filtering

mechanism, however this client library will be updated to use the new one,

and at that point we will strongly recommend all applications be updated.

The exact fields and special queries available for each object type varies,

see the online documentation for details.

"""

def __init__(self, type_class):

self._type_class = type_class

self._filter = {}

self._count_cached = None

self._page_size = 100

self._order = {}

def _make_query(self, page_number=1, page_size=None):

query_args = {

'page_size': page_size or self._page_size,

'page': page_number,

}

query_args.update(self._get_queryargs())

resp = self._type_class.api.get(self._type_class._url_name, query_args)

self._count_cached = resp['meta']['total_count']

return resp

def _get_queryargs(self):

args = {}

args.update(self.filter)

args.update(self.order)

return args

@property

def count(self):

"""Total amount of objects matched by the current query, reading this

may cause a remote request"""

if self._count_cached is None:

# make a query for a single result,

# this will update the cached count

self._make_query(1, 1)

return self._count_cached

@property

def total_pages(self):

"""Total number of pages required for all objects based on current

pagesize, reading this may cause a remote request"""

return (self.count + self.page_size - 1) // self.page_size

@property

def page_size(self):

"Number of objects to return per page"

return self._page_size

@page_size.setter

def page_size(self, value):

value = int(value)

assert value >= 1

self._page_size = value

return self

@property

def filter(self):

"Filter to apply to query"

return self._filter

@filter.setter

def filter(self, value):

if value == self._filter:

return

if value:

assert 'filter_type' in value and \

'filter_field' in value and \

'filter_value' in value

assert value['filter_type'] in (

'field',

'field-prefix',

'field-search',

'special'

)

self._filter = dict(value)

else:

self._filter = {}

self._count_cached = None

return self

@property

def order(self):

return self._order

@order.setter

def order(self, value):

if value:

assert 'order_field' in value and 'order_direction' in value

assert value['order_direction'] in ('asc', 'desc')

self._order = dict(value)

else:

self._order = {}

return self

def make_filter(self, filter_type=None, filter_field=None,

filter_value=None):

if None in (filter_type, filter_field, filter_value):

self.filter = {}

else:

self.filter = {

'filter_type': filter_type,

'filter_field': filter_field,

'filter_value': filter_value

}

return self

def remove_filter(self):

"Remove any filter currently set"

self.filter = {}

return self

def filter_field(self, filter_field, filter_value):

"Filter on a basic field, look for exact matches"

return self.make_filter('field', filter_field, filter_value)

def filter_prefix(self, filter_field, filter_value):

"Filter on a basic field, look for prefix matches"

return self.make_filter('field-prefix', filter_field, filter_value)

def filter_search(self, filter_field, filter_value):

"Filter on a basic field, look for substring matches"

return self.make_filter('field-search', filter_field, filter_value)

def filter_special(self, filter_field, filter_value):

"Filter on a special query"

return self.make_filter('special', filter_field, filter_value)

def search(self, search_terms):

"Filter by a full data search (exact meaning depends on object type)"

return self.make_filter('special', 'search', search_terms)

def get_page(self, page_number):

"Fetch objects for the one-based page number"

resp = self._make_query(int(page_number))

return [

self._type_class._object_class(

self._type_class.api,

self._type_class,

) for o in resp['data']

]

def iter_all(self):

"Iterate over all matched objects"

# make a copy of ourselves so parameters can't be changed behind

# our back

import copy

qry = copy.copy(self)

# iterate over every object on every page

for page_number in range(1, qry.total_pages+1):

page = qry.get_page(page_number)

for obj in page:

yield obj

class SimpleClass(object):

"""Represents a collection of remote objects on the Billogram service

Provides methods to search, fetch and create instances of the object type.

See the online documentation for the actual structure of remote objects.

"""

_object_class = SimpleObject

def __init__(self, api, url_name, object_id_field):

self._api = api

self._url_name = url_name

self._object_id_field = object_id_field

def _url_of(self, obj=None, obj_id=None):

if obj_id is None:

obj_id = obj[self._object_id_field]

return '{}/{}'.format(self.url_name, obj_id)

@property

def url_name(self):

return self._url_name

@property

def api(self):

return self._api

def query(self):

"Create a query for objects of this type"

return Query(self)

def get(self, object_id):

"Fetch a single object by its identification"

resp = self.api.get(self._url_of(obj_id=object_id))

return self._object_class(self.api, self, resp['data'])

def create(self, data):

"Create a new object with the given data"

resp = self.api.post(self.url_name, data)

return self._object_class(self.api, self, resp['data'])

class BillogramObject(SimpleObject):

"""Represents a billogram object on the Billogram service

In addition to the basic methods of the SimpleObject remote object class,

also provides specialized methods to perform events on billogram objects.

See the online documentation for the actual structure of billogram objects.

"""

__slots__ = ()

def perform_event(self, evt_name, evt_data=None):

"""Perform a generic state transition event on billogram object

"""

url = '{}/command/{}'.format(self._url, evt_name)

resp = self._api.post(url, evt_data)

self._data = resp['data']

return self

def create_payment(self, amount):

"""Create a manual payment on billogram

Only possible in "Unpaid" state.

"""

assert amount > 0

return self.perform_event('payment', {'amount': amount})

def credit_amount(self, amount):

"""Credit a specific amount of the billogram

Only possible in states "Unpaid", "Sold" and "Ended".

"""

assert amount > 0

return self.perform_event(

'credit',

{

'mode': 'amount',

'amount': amount

}

)

def credit_full(self):

"""Credit the full, original amount of the billogram

Only possible in states "Unpaid", "Sold" and "Ended".

"""

return self.perform_event('credit', {'mode': 'full'})

def credit_remaining(self):

"""Credit the remaining unpaid amount of the billogram

Only possible in states "Unpaid", "Sold" and "Ended".

"""

return self.perform_event('credit', {'mode': 'remaining'})

def send_message(self, message):

"""Send a message to the recipient of the billogram

Possible from all states, except on deleted billograms.

"""

return self.perform_event('message', {'message': message})

def send_to_collector(self):

"""Send the billogram to the collection agency

Only possible from state "Unpaid".

"""

return self.perform_event('collect')

def send_to_factoring(self):

"""Send the billogram to the factoring agency to be sold

Only possible from state "Unattested".

"""

return self.perform_event('sell')

def send_reminder(self, method=None):

"""Send a reminder to the recipient

'method' is the type of reminder to be sent:

- "Email"

- "Letter".

Only possible from state "Unpaid".

"""

if method:

assert method in ('Email', 'Letter')

return self.perform_event('remind', {'method': method})

return self.perform_event('remind')

def send(self, method):

"""Send the billogram to the recipient

'method' is the medium to send the billogram by:

- "Email"

- "Letter"

- "Email+Letter".

Only possible from state "Unattested".

"""

assert method in ('Email', 'Letter', 'Email+Letter')

return self.perform_event('send', {'method': method})

def resend(self, method=None):

"""Send the billogram to the recipient again

'method' is the medium to send the billogram by:

- "Email"

- "Letter".

Only possible from state "Unpaid".

"""

if method:

assert method in ('Email', 'Letter')

return self.perform_event('resend', {'method': method})

return self.perform_event('resend')

def get_invoice_pdf(self, letter_id=None, invoice_no=None):

"""Fetch the PDF content for a specific invoice on this billogram

"""

import base64

url = '{}.pdf'.format(self._url)

params = {}

if letter_id:

params['letter_id'] = letter_id

if invoice_no:

params['invoice_no'] = invoice_no

resp = self._api.get(

url,

params,

expect_content_type='application/json'

)

return base64.b64decode(resp['data']['content'])

def get_attachment_pdf(self, letter_id=None, invoice_no=None):

"""Fetch the PDF attachment for the billogram

"""

import base64

url = '{}/attachment.pdf'.format(self._url)

resp = self._api.get(url, expect_content_type='application/json')

return base64.b64decode(resp['data']['content'])

def attach_pdf(self, filepath):

"""Attach a PDF to the billogram

"""

import base64

import os

with file(filepath) as f:

content = f.read()

filename = os.path.basename(filepath)

return self.perform_event(

'attach',

{

'content': base64.b64encode(content),

'filename': filename

}

)

def writeoff(self):

"""Write-off remaining fees from a billogram.

"""

return self.perform_event('writeoff')

class BillogramQuery(Query):

"""Represents a query for billogram objects

"""

def filter_state_any(self, *states):

"Find billogram objects with any state of the listed ones"

if len(states) == 1 and (

isinstance(states[0], list) or

isinstance(states[0], tuple) or

isinstance(states[0], set) or

isinstance(states[0], frozenset)

states = states[0]

assert all(isinstance(s, basestring) for s in states)

return self.filter_field('state', ','.join(states))

class BillogramClass(SimpleClass):

"""Represents the collection of billogram objects on the Billogram service

In addition to the methods of the SimpleClass collection wrapper, also

provides specialized creation methods to create billogram objects and state

transition them immediately.

"""

_object_class = BillogramObject

def __init__(self, api):

super(BillogramClass, self).__init__(api, 'billogram', 'id')

def query(self):

"Create a query for billogram objects"

return BillogramQuery(self)

def create_and_send(self, data, method):

"""Create the billogram and send it to the recipient in one operation

'method' is the medium to send the billogram by:

- "Email"

- "Letter"

- "Email+Letter".

New billogram will be in state "Unpaid" or "Ended" (if the total sum

would be zero).

"""

assert method in ('Email', 'Letter', 'Email+Letter')

billogram = self.create(data)

try:

billogram.send(method)

except Exception as e:

billogram.delete()

raise e

return billogram

def create_and_sell(self, data):

"""Create the billogram and send it to factoring in one operation

New billogram will be in state "Factoring".

"""

data['_event'] = 'sell'

billogram = self.create(data)

return billogram

# make an exportable namespace-class with all the exceptions

BillogramExceptions = type(

str('BillogramExceptions'),

(),

{

nm: cl for

nm, cl in

globals().items() if

isinstance(cl, type) and issubclass(cl, BillogramAPIError)

}

)

# just the BillogramAPI class and the exceptions are really part

# of the call API of this module

__all__ = ['BillogramAPI', 'BillogramExceptions']

billogram-v2-api-python-lib/billogram_api.py at develop · billogram/billogram-v2-api-python-lib · GitHub

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