Python list-of-lists interface wrapper for Google Sheet API RPC. `spreadsheet['sheet name']['A1':'B2'] = [[1, 2], [3, 2]]`

google_sheets.py

# Copyright 2021 Daniel Dotsenko <dvdotsenko@gmail.com>
#
# 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.
#
# (MIT license)

"""
Google Sheets Python API repackaged as pythonic collections operations that abstract away API calls.

Requires modules:
    google-api-python-client
    google-auth-httplib2
    google-auth-oauthlib


Example:

    from google_sheets import CredentialsManager, Spreadsheet

    # Create "Desktop" type credentials in Google Cloud console and download the credentials document
    app_creds = {
        "installed": {
            "auth_provider_x509_cert_url": "https://www.googleapis.com/oauth2/v1/certs",
            "auth_uri": "https://accounts.google.com/o/oauth2/auth",
            "client_id": "155....com",
            "client_secret": "G...H",
            "project_id": "##...##",
            "redirect_uris": ["urn:ietf:wg:oauth:2.0:oob","http://localhost"],
            "token_uri": "https://oauth2.googleapis.com/token"
        }
    }
    client_creds = None  # none if you are starting
    spreadsheet_id = "18e1ANo...J9h2M"

    cm = CredentialsManager(
        app_creds,
        client_creds,
        scopes = Spreadsheet.SCOPES
    )

    # you can force refresh of the creds and, thus, front-load the hand-shake
    # if no user creds data is available, this will start the OAuth handshake process
    cm.refresh_credentials()

    # observe user_credentials_data now available.
    # You can save it for reuse later to avoid having to do OAuth handshake again
    cm.user_credentials_data

    spreadsheet = Spreadsheet(
        spreadsheet_id,
        cm.user_credentials
    )

    ["Sheet 1", "Sheet 2"] = spreadsheet.keys()

    sheet = spreadsheet['Sheet 1']

    sheet['A1':'B2'] = [
        ['a1', NO_CHANGE],
        ['a2', 'b2']
    ]
    [['a1', None], ['a2', 'b2']] = sheet['A1':'B2']

    del sheet['A2':'B2']
    [['a1']] = sheet['A1':'B2']
    # single cell value request returns only cell value, not an array-of-arrays structure
    'a1' = sheet['A1']
    del sheet['A1']

    # Google collapses sparse arrays when sheet does not have values in cells
    # To make it easier to have "random access" experience with returned arrays of various lengths
    # use Grid list-like wrapper for returned range of cells:

    g = Grid([
        ['a1'],
        ['a2', 'b2'],
        [],    # no values here
        ['a4', 'b4', 'c4'],
    ])
    None = g[2:4]  # note zero-indexed address
    g[2:2] = 'off to side'
    g
    > [
        ['a1'],
        ['a2', 'b2'],
        [ None, None, 'off to side'],
        ['a4', 'b4', 'c4'],
    ]

    # value of None sent to Google Sheet means "don't change this cell's value.
    # if you need to override the value in the sheet, use empty string `''` instead of None.

"""

import json
import os.path

from functools import cached_property, cache
from typing import TypedDict, List, Dict, Optional, Any, Union

import google.oauth2.credentials

from google.auth.transport.requests import Request
from google.oauth2.credentials import Credentials
from google_auth_oauthlib.flow import InstalledAppFlow
from googleapiclient.discovery import build


MAJOR_DIMENSION_ROWS = 'ROWS'
MAJOR_DIMENSION_COLUMNS = 'COLUMNS'

# Providing None as value for a cell during "update" call
# effectively means "don't change this cell"
NO_CHANGE = None


CellValue = Union[str,int,bool,None]


class ApplicationCredentials(TypedDict):
    auth_provider_x509_cert_url: str
    auth_uri: str
    client_id: str
    client_secret: str
    project_id: str
    redirect_uris: List[str]
    token_uri: str


class DesktopApplicationCredentials(TypedDict):
    installed: ApplicationCredentials


class UserCredentials(TypedDict):
    client_id: str
    client_secret: str
    expiry: str
    refresh_token: str
    scopes: List[str]
    token: str
    token_uri: str


class CredentialsManager:

    application_credentials_data: DesktopApplicationCredentials
    user_credentials_data: Optional[UserCredentials]
    scopes: List[str]

    def __init__(
            self,
            application_credentials_data: DesktopApplicationCredentials,
            user_credentials_data: UserCredentials = None,
            scopes: List[str] = None,
    ):
        self.application_credentials_data: DesktopApplicationCredentials = application_credentials_data
        self.user_credentials_data: UserCredentials = user_credentials_data
        self.scopes = scopes
        self._creds = None

    def refresh_credentials(self) -> google.oauth2.credentials.Credentials:
        if not self._creds and self.user_credentials_data:
            self._creds = Credentials.from_authorized_user_info(self.user_credentials_data, self.scopes)

        if not self._creds or not self._creds.valid:
            if self._creds and self._creds.expired and self._creds.refresh_token:
                self._creds.refresh(Request())
            else:
                self._creds = InstalledAppFlow.from_client_config(
                    self.application_credentials_data, self.scopes
                ).run_console()
            self.user_credentials_data = json.loads(self._creds.to_json())

        return self._creds

    @property
    def user_credentials(self):
        return self.refresh_credentials()

    @staticmethod
    def credentials_to_file(creds: google.oauth2.credentials.Credentials, filename):
        assert isinstance(creds, google.oauth2.credentials.Credentials)
        with open(filename, 'w') as fp:
            json.dump(json.laods(creds.to_json()), fp, sort_keys=True, indent=2)

    @staticmethod
    def credentials_from_file(filename, required=False) -> Optional[Dict]:
        if os.path.isfile(filename):
            with open(filename, 'r') as fp:
                return json.load(fp)
        if required:
            raise FileNotFoundError(filename)


def _extract_coordinates(item):
    """
    processes the value passed to o[value] notation.
    Typically it's either a `slice` type of 3 elements, or a single item

    Meaning of values is similar to Pandas / NumPy multidimensional array get/set notation .

    'A1', 'B2' = x['A1':'B2']
    'A1', None = x['A1':]
    'A1', 'B2' = x['A1:B2']
    'A1', None = x['A1']
    """
    if isinstance(item, slice):
        a, b, c = item.start, item.stop, item.step
        if not(c is None):
            raise KeyError(item)
    else:
        a, b, c = item, None, None

    if isinstance(a, str):
        if ':' in a:
            if b or c:
                raise KeyError(item)
            parts = a.split(':')
            if len(parts) > 2:
                raise KeyError(item)
            a, b = parts

    return a, b


def _list_get(l, i, default=None):
    # safe .get like dict.get(key)
    try:
        return l[i]
    except IndexError:
        return default


NoneConstructor = lambda: None


def _list_grow_to_index(l, i, empty_value_contructor=NoneConstructor):
    indexable_max = len(l) - 1
    if i > indexable_max:
        padding_needed = i - indexable_max
        while padding_needed:
            # don't use [O]*padding_needed.
            # It reuses the O instance, causing referential side effects.
            # Looping makes constructor to be called separately each time
            l.append(empty_value_contructor())
            padding_needed -= 1


def _list_set(l, i, value, empty_value_contructor=NoneConstructor):
    indexable_max = len(l) - 1
    if i <= indexable_max:
        l[i] = value
    elif i == indexable_max + 1:
        l.append(value)
    else:  # need to grow the underlying array manually
        _list_grow_to_index(l, i-1, empty_value_contructor)
        l.append(value)


class Grid(list):
    """
    Wraps *sparse* array of arrays representing data for a spreadsheet into
    a safe "random access" grid.

    It feels like a mix of array of arrays and a 2-dimensional Pandas / NumPy array
    Unlike NumPy/Pandas, Row are top-level iterable, not columns.

    g = Grid([['a1','b1'],['a2','b2']])

    'a1' = g[0:0]

    del g[0:0]
    g
    > [[None, 'b1'], ['a2', 'b2']]

    # auto-create row 3 (zero-indexed), column 4 (zero-indexed) on value set
    g[3:4] = "row 4 col 5 value"
    g
    > [
        [None, 'b1'],
        ['a2', 'b2'],
        [],
        [None, None, None, None, 'row 4 col 5 value']
    ]
    """

    def __getitem__(self, item):
        a, b = _extract_coordinates(item)
        try:
            v = super().__getitem__(a)
        except IndexError:
            v = []

        if b is None:
            return v
        else:
            return _list_get(v, b)

    def _grow_to_index(self, i) -> Any:
        indexable_max = len(self) - 1
        if i > indexable_max:
            padding_needed = i - indexable_max
            while padding_needed:
                self.append([])
                padding_needed -= 1

    def __setitem__(self, key, value):
        a, b = _extract_coordinates(key)
        _list_grow_to_index(self, a, list)

        if b is None:
            super().__setitem__(a, value)
        else:
            row = super().__getitem__(a)
            _list_set(
                row,
                b,
                value,
            )

    def __delitem__(self, key):
        if self.__getitem__(key) is None:
            return
        self.__setitem__(key, None)

    @property
    def height(self):
        return len(self)

    @property
    def width(self):
        width = 0
        for e in self:
            width = max(width, len(e))
        return width


class Sheet:
    def __init__(self, name, spreadsheet_id, api):
        self.name = name
        self.spreadsheet_id = spreadsheet_id
        self.api = api

    def __repr__(self):
        return super().__repr__()[:-1] + f" '{self.name}'>"

    def _form_range(self, a, b):
        if b:
            return f"{self.name}!{a}:{b}"
        else:
            return f"{self.name}!{a}"

    def __delitem__(self, key):
        a, b = _extract_coordinates(key)

        self.api.values().clear(
            spreadsheetId=self.spreadsheet_id,
            range=self._form_range(a, b)
        ).execute()

    def __setitem__(self, key, value):
        """

        x['A1':'B2'] = [['a1', 'b1'], ['a2', 'b2']]
        x['A1'] = 'a1'  # note no brackets for single set.

        :param key:  slice('A1', 'B2') or 'A1'
        :param value: [[1,2],[3,4]]
        """
        a, b = _extract_coordinates(key)
        rr = self._form_range(a, b)
        self.api.values().update(
            spreadsheetId=self.spreadsheet_id,
            range=rr,
            includeValuesInResponse=False,
            valueInputOption='RAW',
            body=dict(
                majorDimension=MAJOR_DIMENSION_ROWS,
                range=rr,
                values=value if b else [[value]],
            )
        ).execute()

    def __getitem__(self, item):
        a, b = _extract_coordinates(item)
        v = self.api.values().get(
            spreadsheetId=self.spreadsheet_id,
            range=self._form_range(a, b),
            majorDimension=MAJOR_DIMENSION_ROWS,
        ).execute().get('values', [])
        if b is None:
            # return a single cell value, not an array of arrays
            # if value was there, it returns as [[value]] from Google
            # If it's empty, we have our default empty array, which should result in None returned
            # let's use a loop and fall through it if return array is empty.
            for row in v:
                for cell_value in row:
                    return cell_value
            return None
        return v


class Spreadsheet:
    """
    Works like a Dict, where keys are sheet names and values are Sheet object
    where Sheet object also works as Dict supporting

    setting:
                            # array of rows
        sheet['A1':'B2'] = [
            ["A1", "B1"],
            [NO_CHANGE, "B2"]
        ]
        sheet['A1'] = 'a1'  # note, no brackets for single set

    getting:
        [["A1", "B1"], [None, "B2"]] = sheet['A1':'B2']

    clearing cells:
        del sheet['A1':'B2']
    """

    API_VERSION = 'v4'
    API_NODE = 'sheets'

    SCOPES = [
        'https://www.googleapis.com/auth/drive',
        'https://www.googleapis.com/auth/drive.readonly',
    ]

    def __init__(self, spreadsheet_id, credentials: google.oauth2.credentials.Credentials):
        self.spreadsheet_id = spreadsheet_id
        self.credentials = credentials

    def __repr__(self):
        return super().__repr__()[:-1] + f" '{self.spreadsheet_id}'>"

    @cached_property
    def api(self):
        return build(self.API_NODE, self.API_VERSION, credentials=self.credentials).spreadsheets()

    @cache
    def keys(self):
        vv = self.api.get(
            spreadsheetId=self.spreadsheet_id,
            includeGridData=False,
        ).execute()
        return [
            v['properties']['title']
            for v in vv.get('sheets', [])
        ]

    def values(self):
        return [
            Sheet(
                name,
                self.spreadsheet_id,
                self.api,
            )
            for name in self.keys()
        ]

    def items(self):
        return [
            (sheet.name, sheet)
            for sheet in self.values()
        ]

    def __getitem__(self, item) -> Sheet:
        if item in self.keys():
            return Sheet(
                item,
                self.spreadsheet_id,
                self.api,
            )
        raise KeyError(item)