views.py 9.15 KB
Newer Older
1
2
3
4
#!/usr/bin/env python3
"""
    Routes
"""
5
import copy
6
7
8
9
10
import json
import os
from collections import OrderedDict
from pathlib import Path

11
from validata_validate import csv_helpers
12
from validata_ui_next import app
13
from validata_ui_next.util import flash_error, flash_info, flash_success, flash_warning, ValidataSource
14
from validata_ui_next.validate_helper import ValidatorHelper
15

Pierre Dittgen's avatar
Pierre Dittgen committed
16
from flask import Flask, jsonify, redirect, render_template, request, url_for
17
18
import tabulator

19
from io import BytesIO
20

21
22

def extract_source_data(source: ValidataSource, preview_rows_nb=5):
23
    """ Computes table preview """
24
25
26
27
28
29
30

    def stringify(val):
        """ Transform value into string """
        if val is None:
            return ''
        return str(val)

31
32
    header = None
    rows = []
Pierre Dittgen's avatar
Pierre Dittgen committed
33
    nb_rows = 0
34
35
36
37
38
39

    delimiter = None
    if source.format == "csv":
        delimiter = csv_helpers.detect_dialect(source.data, format=source.format,
                                               scheme=source.scheme, custom_loaders=source.custom_loaders).delimiter
    with tabulator.Stream(source.data, format=source.format, scheme=source.scheme, custom_loaders=source.custom_loaders, delimiter=delimiter) as stream:
40
41
42
43
        for row in stream:
            if header is None:
                header = row
            else:
44
                rows.append(list(map(stringify, row)))
Pierre Dittgen's avatar
Pierre Dittgen committed
45
                nb_rows += 1
46
47
48
49
    return {'header': header,
            'data_rows': rows,
            'rows_nb': nb_rows,
            'preview_rows_nb': min(preview_rows_nb, nb_rows)}
50
51


Pierre Dittgen's avatar
Pierre Dittgen committed
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
ERR_CODE_TO_CONTEXT = dict([
    # TODO: gets it from spec.json
    ('duplicate-header', 'head'),
    ('extra-value', 'body'),
    ('missing-value', 'body'),
    ('source-error', 'table'),
    ('schema-error', 'table'),
    ('non-matching-header', 'head'),
    ('blank-row', 'body'),
    ('blank-header', 'head'),
    ('enumerable-constraint', 'body'),
    ('http-error', 'table'),
    ('scheme-error', 'table'),
    ('type-or-format-error', 'body'),
    ('format-error', 'table'),
    ('extra-header', 'head'),
    ('pattern-constraint', 'body'),
    ('required-constraint', 'body'),
    ('missing-header', 'head'),
    ('maximum-length-constraint', 'body'),
    ('maximum-constraint', 'body'),
    ('minimum-length-constraint', 'body'),
    ('encoding-error', 'table'),
    ('io-error', 'table'),
    ('unique-constraint', 'body'),
    ('duplicate-row', 'body'),
    ('minimum-constraint', 'body'),

    # TODO: get it from validata_validate
81
82
    ('invalid-column-delimiter', 'table'),
    ('missing-headers', 'table'),
Pierre Dittgen's avatar
Pierre Dittgen committed
83
84
85
86
87

    # Custom checks fall in default case: body
])


88
89
90
91
92
93
94
95
96
97
98
99
100
101
def improve_messages(errors):
    """ Translates and improve error messages """

    def update_message(error, new_message):
        """ set a new error message """

        # Stores previous message if exists
        if 'message' in error:
            error['_original_message'] = error['message']
        error['message'] = new_message

    for error in errors:

        if error['code'] == 'blank-row':
Pierre Dittgen's avatar
Pierre Dittgen committed
102
103
            update_message(error, 'la ligne est vide')

104
        elif error['code'] == 'duplicate-row':
Pierre Dittgen's avatar
Pierre Dittgen committed
105
106
107
108
109
110
111
112
113
            msg_prefix = 'la ligne est identique '
            row_numbers = error['message-data']['row_numbers']
            if len(row_numbers) == 1:
                msg = msg_prefix + "à la ligne {}".format(row_numbers)
            else:
                idx = row_numbers.rfind(',')
                param_str = row_numbers[:idx] + ' et' + row_numbers[idx+1:]
                msg = msg_prefix + "aux lignes {}".format(param_str)
            update_message(error, msg)
114
115
116
117
118

    # Return updated error list
    return errors


119
def contextualize(errors):
Pierre Dittgen's avatar
Pierre Dittgen committed
120
121
    """ add context to errors """

122
123
124
125
126
127
128
129
130
131
    return [{**err, 'context': ERR_CODE_TO_CONTEXT.get(err['code'], 'body')} for err in errors]


def create_validata_report(goodtables_report):
    """ Creates an error report easier to handle and display in templates:
        - only one table
        - errors are contextualized
        - error-counts is ok
        - errors are grouped by lines
        - errors are separated into "structure" and "body"
132
        - error messages are improved
133
134
135
136
137
138
139
140
141
142
143
    """
    report = copy.deepcopy(goodtables_report)

    # One table is enough
    del report['table-count']
    report['table'] = report['tables'][0]
    del report['tables']
    del report['table']['error-count']
    del report['table']['time']
    del report['table']['valid']
    del report['valid']
144
145
146
147
    # use _ instead of - to ease information picking in jinja2 template
    report['table']['row_count'] = report['table']['row-count']

    # Shortcut
148
    report['table']['col_count'] = len(report['table'].get('headers', []))
149
150
151
152
153

    # Add context to errors
    errors = contextualize(report['table']['errors'])
    del report['table']['errors']

154
155
156
    # Provide better (french) messages
    errors = improve_messages(errors)

157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
    # Count errors
    report['error_count'] = len(errors)
    del report['error-count']

    # Then group them in 2 groups : structure and body
    report['table']['errors'] = {'structure': [], 'body': []}
    for err in errors:
        if err['context'] != 'body':
            report['table']['errors']['structure'].append(err)
        else:
            report['table']['errors']['body'].append(err)

    # and group body errors by row id
    rows = []
    current_row_id = 0
    for err in report['table']['errors']['body']:
        row_id = err['row-number']
        del err['row-number']
        del err['context']
        if row_id != current_row_id:
            current_row_id = row_id
            rows.append({'row_id': current_row_id, 'errors': {}})
179
180
181
182
183
184
185

        column_id = err.get('column-number')
        if column_id is not None:
            del err['column-number']
            rows[-1]['errors'][column_id] = err
        else:
            rows[-1]['errors']['row'] = err
186
    report['table']['errors']['by_rows'] = rows
Pierre Dittgen's avatar
Pierre Dittgen committed
187
188
189
190

    return report


191
def validate(schema_code, source: ValidataSource):
192
193
    """ Validate source and display report """

194
195
196
    goodtables_report = ValidatorHelper.validate(schema_code, **source.get_goodtables_source())

    source_data = extract_source_data(source)
197
198
199

    validata_report = create_validata_report(goodtables_report)

200
    # return jsonify(validata_report)
Pierre Dittgen's avatar
Pierre Dittgen committed
201

Pierre Dittgen's avatar
Pierre Dittgen committed
202
203
    # Complete report
    val_info = ValidatorHelper.schema_info(schema_code)
204
    return render_template('validation_report.html', title='Rapport de validation',
205
                           val_info=ValidatorHelper.schema_info(schema_code), report=validata_report,
206
                           source=source, source_type=source.type, source_data=source_data,
207
                           report_str=json.dumps(validata_report, sort_keys=True, indent=2),
Pierre Dittgen's avatar
Pierre Dittgen committed
208
209
                           breadcrumbs=[{'url': url_for('home'), 'title': 'Accueil'},
                                        {'url': url_for('scdl_validator', val_code=schema_code), 'title': val_info['title']}])
210
211


212
213
214
215
216
217
218
219
def bytes_data(f):
    """ Gets bytes data from Werkzeug FileStorage instance """
    iob = BytesIO()
    f.save(iob)
    iob.seek(0)
    return iob.getvalue()


220
221
222
223
224
225
# Routes


@app.route('/')
def home():
    """ Home page """
Pierre Dittgen's avatar
Pierre Dittgen committed
226
    validators = ValidatorHelper.schema_info_list()
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
    return render_template('home.html', title='Accueil', validators=validators)


@app.route('/about')
def about():
    """ Help -> About page """
    return render_template('about.html', title='À propos',
                           breadcrumbs=[{'url': url_for('home'), 'title': 'Accueil'}, ])


@app.route('/validators')
def validators():
    """ No validators page """
    return redirect(url_for('home'))


@app.route('/validators/<val_code>', methods=['GET', 'POST'])
def scdl_validator(val_code):
    """ Validator page """

    if not ValidatorHelper.schema_exist(val_code):
        flash_error('Validateur [{}] inconnu'.format(val_code))
        return redirect(url_for('home'))

    if request.method == 'GET':

Pierre Dittgen's avatar
Pierre Dittgen committed
253
        val_info = ValidatorHelper.schema_info(val_code)
254
255
256
257
258
259
260
261
262
263
264
265
266
267
        input_param = request.args.get('input')

        # First form display
        if input_param is None or input_param not in ('url', 'example'):
            return render_template('validator.html', title=val_info['title'],
                                   val_info=val_info,
                                   breadcrumbs=[{'url': url_for('home'), 'title': 'Accueil'}, ])

        # Process URL
        else:
            url = request.args.get('url')
            if url is None or url == '':
                flash_error("Vous n'avez pas indiqué d'url à valider")
                return redirect(url_for('scdl_validator', val_code=val_code))
268
            return validate(val_code, ValidataSource(url, url, 'url'))
269
270
271
272
273
274
275
276
277
278
279
280
281

    else:  # POST
        input_param = request.form.get('input')
        if input_param is None:
            flash_error('Source non définie')
            return redirect(url_for('scdl_validator', val_code=val_code))

        # File validation
        if input_param == 'file':
            f = request.files.get('file')
            if f is None:
                flash_warning("Vous n'avez pas indiqué de fichier à valider")
                return redirect(url_for('scdl_validator', val_code=val_code))
282
283

            return validate(val_code, ValidataSource(bytes_data(f), f.filename, 'file'))
284
285

        return 'Bizarre, vous avez dit bizarre ?'