nopaque/app/services/forms.py

from flask_wtf import FlaskForm
from wtforms import MultipleFileField, SelectField, StringField, SubmitField, ValidationError
from wtforms.validators import DataRequired, Length


class CreateOCRJobForm(FlaskForm):
    description = StringField(
        'Description',
        validators=[DataRequired(), Length(1, 64)]
    )
    files = MultipleFileField('Files', validators=[DataRequired()])
    language = SelectField(
        'Language',
        choices=[('', 'Choose your option'),
                 ('eng', 'English'),
                 ('enm', 'English, Middle (1100-1500)'),
                 ('fra', 'French'),
                 ('frm', 'French, Middle (ca. 1400-1600)'),
                 ('deu', 'German'),
                 ('frk', 'German Fraktur'),
                 ('ita', 'Italian'),
                 ('por', 'Portuguese'),
                 ('spa', 'Spanish; Castilian')
                 ],
        validators=[DataRequired()]
    )
    submit = SubmitField('Create OCR job')
    title = StringField(
        'Title',
        validators=[DataRequired(), Length(1, 32)]
    )

    def validate_files(form, field):
        for file in field.data:
            if not file.filename.lower().endswith(('.pdf', '.tif', '.tiff')):
                raise ValidationError(
                    'File does not have an approved extension: '
                    '.pdf | .tif | .tiff'
                )