Adunatio/restapi/resource.py

from bson import ObjectId
from flask import request
from mongoengine import Document, ObjectIdField, ListField, \
    EmbeddedDocumentField, ReferenceField, ImageField, FileField, DecimalField, QuerySet
from base64 import b64encode

from mongoengine.base import BaseField


class Resource:
    model: Document = None
    qs: dict = {}
    eqs: dict = {}
    build_reference: bool = False
    base64_image: bool = True
    base64_image_as_full: bool = False
    limit: int = 10
    offset: int = 0
    fields: list = []
    ignore_fields: list = []
    mask_fields: dict = {}
    meta: dict = {}
    as_pk: str = 'id'
    query_document: Document = None

    def __init__(self, model: Document):
        self.model = model
        self.limit = 10
        if 'no_image' in request.args:
            self.base64_image = False
        if 'with_sub_docs' in request.args:
            self.build_reference = request.args.get('with_sub_docs')
        if 'thumb' in request.args:
            self.base64_image = True
            self.base64_image_as_full = False
        if 'full_image' in request.args:
            self.base64_image = True
            self.base64_image_as_full = True
        if 'limit' in request.args:
            self.limit = int(request.args.get('limit'))
        if 'fields' in request.args:
            self.fields = request.args.get('fields')
        if 'offset' in request.args:
            self.offset = int(request.args.get('offset'))
        self.meta = getattr(self.model, '_meta')

        if 'ignore_fields' in self.meta:
            self.ignore_fields = self.meta.get('ignore_fields')
        if 'with_sub_docs' in self.meta:
            self.build_reference = self.meta.get('with_sub_docs')
        if 'mask_fields' in self.meta:
            self.mask_fields = self.meta.get('mask_fields')
        if 'document' in self.meta:
            self.model = self.meta.get('document')
        if 'query' in self.meta:
            self.qs = self.meta.get('query')
        if 'as_pk' in self.meta:
            self.as_pk = self.meta.get('as_pk')
        if 'query_document' in self.meta:
            self.query_document = self.meta.get('query_document')

    def external_query(self, qs: dict):
        self.eqs = qs

    def query(self, qs: dict) -> None:

        self.qs = qs

    def to_json(self, pk: str = None) -> tuple:
        query = {}
        if self.qs:
            for key, val in self.qs.items():
                if callable(val):
                    query.update({key: val()})
                else:
                    query.update({key: val})
        if self.query_document:
            query = {}
            if self.eqs:
                for key, val in self.eqs.items():
                    if callable(val):
                        query.update({key: val()})
                    else:
                        query.update({key: val})
            data = self.query_document.objects.filter(**query)
            field_name = ""
            for i in self.model._fields_ordered:
                try:
                    if isinstance(getattr(self.model, i).document_type, self.query_document.__class__):
                        field_name = i + "__in"
                except:
                    pass
            query.clear()
            query = {field_name: [i.id for i in data]}
            for key, val in self.qs.items():
                if callable(val):
                    query.update({key: val()})
                else:
                    query.update({key: val})
            print(query)
        data = self.model.objects.filter(**query)

        count = data.count()
        if pk:
            json_data = self.parse_fields(data.get(**{self.as_pk: pk}), self.model)
        else:
            data = data[self.offset:self.limit + self.offset]
            json_data = []
            for item in data:
                item_data = self.parse_fields(item, self.model)
                json_data.append(item_data)
        return count, json_data

    def parse_field(self, field: BaseField, value: any) -> any:

        if isinstance(field, ObjectIdField):
            return str(value)
        elif isinstance(field, ReferenceField):

            if self.build_reference:
                return self.parse_fields(value, field.document_type)
            if value:
                return str(value.id)
            else:
                return value

        elif isinstance(field, ImageField):
            if self.base64_image and value:
                if self.base64_image_as_full:
                    file = b64encode(value.read()).decode("utf-8")
                    return {
                        "size": value.size,
                        "upload_date": value.gridout.upload_date,
                        "format": value.format,
                        "base64": file
                    }
                else:
                    file = b64encode(value.thumbnail.read()).decode("utf-8")

                    return {
                        "upload_date": value.gridout.upload_date,
                        "format": value.format,
                        "base64": file
                    }
            else:
                if value:
                    return {
                        "size": value.size
                    }
                else:
                    return None
        elif isinstance(field, DecimalField):
            return float(value)
        elif isinstance(field, FileField):
            return "file"
        elif isinstance(field, ListField):
            if isinstance(field.field, EmbeddedDocumentField):
                return [self.parse_fields(item, field.field.document_type) for item in value]
            elif isinstance(field.field, ReferenceField) and self.build_reference:
                return [self.parse_fields(item, field.field.document_type) for item in value]
            else:
                return [self.parse_field(field.field, item) for item in value]
        elif isinstance(value, QuerySet):
            if value.count() > 0:
                return [self.parse_fields(i, value._document) for i in value]

        else:
            return value

    def parse_fields(self, item: Document, model: Document) -> dict:
        parsed_item = {}

        fields = list(getattr(model, "_fields_ordered"))
        if self.model != model:
            in_meta = getattr(model,'_meta')
            if in_meta.get('ignore_fields'):
                self.ignore_fields += in_meta.get('ignore_fields')
        for key, val in model.__dict__.items():
            if isinstance(getattr(model, key), property):
                fields.append(key)
        for i in fields:
            if i not in self.ignore_fields:
                field = getattr(model, i)
                if i not in self.mask_fields:
                    if not item is None:
                        value = getattr(item, i)
                    else:
                        value = None
                else:
                    value = getattr(item, i)
                    if self.mask_fields.get(i) == 'all':
                        value = '*************'
                    elif self.mask_fields.get(i) == 'email':
                        value = '{}****@{}***.{}'.format(value[0], value.split("@")[1][0],
                                                         '.'.join(value.split("@")[1].split(".")[1:]))
                    else:
                        value = '*************'
                if not value is None:
                    parsed_item.update({i: self.parse_field(field, value)})
                else:
                    parsed_item.update({i: None})
        return parsed_item