portal-oddajanje-solar/portal/solar.py

import logging
import re
import traceback
import hashlib
from datetime import datetime
from sqlalchemy import desc

from portal.base import UploadHandler
from portal.model import db, UploadSolar, ContractsSolar, RegisteredUser, Institution


VALID_PROGRAMS = {'OS', 'SSG', 'MGP', 'ZG', 'NPI', 'SPI', 'SSI', 'PTI'}
VALID_SUBJECTS = {'slo', 'drug-jez', 'drug-druz', 'drug-narav', 'drug-strok', 'drug-izb'}
VALID_TEXT_TYPES = {'esej-spis', 'prakticno', 'solski-test', 'delo-v-razredu'}
VALID_GRAMMAR_CORRECTIONS = {'popr-ne', 'brez-popr', 'popr-da'}

MAXLEN_FORM = 150


class UploadHandlerSolar(UploadHandler):

    @staticmethod
    def store_metadata(upload_metadata, user_id):
        timestamp = datetime.fromtimestamp(upload_metadata['timestamp'])
        form_data = upload_metadata['form_data']
        file_hashes = upload_metadata['file_hashes_dict']
        sorted_f_hashes = list(file_hashes.values())
        sorted_f_hashes.sort()

        institution_id = UploadHandler.get_user_institution(user_id)

        model_obj = UploadSolar(
                    upload_user = user_id,
                    institution = institution_id,
                    upload_hash=upload_metadata['upload_id'],
                    timestamp=timestamp,
                    program=form_data['program'],
                    subject=form_data['predmet'],
                    subject_custom=form_data['predmet-custom'],
                    grade=form_data['letnik'],
                    text_type=form_data['vrsta'],
                    text_type_custom=form_data['vrsta-custom'],
                    school_year=form_data['solsko-leto'],
                    grammar_corrections=form_data['jezikovni-popravki'],
                    upload_file_hashes=sorted_f_hashes
               )
        self.store_model(model_obj)

    def handle_upload(self, request, user_id):
        err = self.check_upload_request(request)
        if err:
            return err, 400

        err = self.check_form(request.form)
        if err:
            return err, 400

        # Parse request.
        upload_metadata = self.extract_upload_metadata('solar', request)

        logging.info('Upload from user "{}" with upload id "{}" supplied form data: {}'.format(
            user_id,
            upload_metadata['upload_id'],
            str(upload_metadata['form_data']
        )))

        # Store uploaded files to disk.
        self.store_datafiles(request.files, upload_metadata)

        # Store to database.
        self.store_metadata(upload_metadata, user_id)

        return 'Uspešno ste oddali datotek(e). Št. datotek: {}'.format(len(request.files))

    def handle_contract_upload(self, request, user_id):
        contracts_type = request.form['tip-pogodbe']
        
        if contracts_type not in ['sola', 'ucenci-starsi']:
            return 'Neveljaven tip pogodbe.'

        f_obj = None
        for key, f in request.files.items():
            if key.startswith('file'):
                mimetype = f.content_type
                if mimetype != 'application/pdf':
                    return 'Datoteka "{}" ni formata PDF.'.format(f.filename)
                else:
                    f_obj = f
                    break
        
        if not f_obj:
            return 'Niste naložili nobene datoteke.'

        base = self.get_uploads_subdir('contracts')
        f_hash = hashlib.md5(f_obj.read())

        # First byte used for indexing, similarly like git does for example.
        sub_dir = base / f_hash[:2]
        if not sub_dir.exists():
            sub_dir.mkdir()

        path = sub_dir / f_hash[2:] + '.pdf'
        f_obj.save(path)

        user_obj = RegisteredUser.query.filter_by(id=user_id).one()
        institution_id = user_obj.institution
        is_institution_moderator = user_obj.institution_moderator

        if institution_id is None:
            return 'Vaš uporabnik ni dodeljen nobeni inštituciji.'

        if contracts_type == 'sola':
            if not is_institution_moderator:
                return 'Vaš uporabnik nima pravic za nalaganje pogodbe s šolo.'
            Institution.update().values(file_contract=f_hash).where(id=institution_id)

        model_obj = ContractsSolar(
                    institution=institution_id,
                    upload_user=user_id,
                    file_contract=f_hash,
                    contracts_type=contracts_type,
               )
        self.store_model(model_obj)
        return 'Nalaganje pogodbe je bilo uspešno.'

    @staticmethod
    def check_form(form):
        program = form['program']
        predmet = form['predmet']
        letnik = int(form['letnik'])
        vrsta = form['vrsta']
        solsko_leto = form['solsko-leto']
        jezikovni_popravki = form['jezikovni-popravki']

        if program not in VALID_PROGRAMS:
            return 'Invalid program "{}"'.format(program)
        if predmet not in VALID_SUBJECTS:
            return 'Invalid subject "{}"'.format(premdet)
        if letnik < 1 or letnik > 9:
            return 'Invalid grade: {}'.format(letnik)
        if vrsta not in VALID_TEXT_TYPES:
            return 'Invalid text type "{}"'.format(vrsta)
        if not re.match('^\d{0,2}-\d{0,2}$', solsko_leto):
            return 'Invalid school year "{}"'.format(solsko_leto)
        if jezikovni_popravki not in VALID_GRAMMAR_CORRECTIONS:
            return 'Invalid text type "{}"'.format(jezikovni_popravki)

        for key, val in form.items():
            if len(val) > MAXLEN_FORM:
                return 'Value in form field "{}" exceeds max len of {}'.format(key, MAXLEN_FORM)


def get_upload_history(user_id, n=20):
    return UploadSolar.query.filter_by(upload_user=user_id).order_by(desc(UploadSolar.timestamp)).limit(n).all()


def get_institution_student_contracts(institution_id):
    return ContractsSolar.query.filter_by(id=institution_id, contract_type='ucenci-starsi').all()


def get_institution_contract(institution_id):
    return ContractsSolar.query.filter_by(id=institution_id, contract_type='sola').first()