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Decode content bytes only with supplied charset or static list of charsets to try

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benoit74 2024-06-14 13:21:18 +00:00
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18 changed files with 1343 additions and 271 deletions
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4
docs/software_architecture.md
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@ -35,10 +35,6 @@ It provide two main features:
Except that, scraper directly uses WarcRecord (returned by cdxj_indexer, implemented in warcio) to access metadata and such. Except that, scraper directly uses WarcRecord (returned by cdxj_indexer, implemented in warcio) to access metadata and such.
## chardet
[chardet Python library](https://pypi.org/project/chardet/) is used to detect character encoding of files when it is absent (only HTML file typically specify its encoding) or incoherent.
## zimscraperlib ## zimscraperlib
[zimscraperlib Python library](https://pypi.org/project/zimscraperlib) is used for ZIM operations. [zimscraperlib Python library](https://pypi.org/project/zimscraperlib) is used for ZIM operations.

1
pyproject.toml
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@ -13,7 +13,6 @@ dependencies = [
"requests==2.32.3", "requests==2.32.3",
"zimscraperlib==3.3.2", "zimscraperlib==3.3.2",
"jinja2==3.1.4", "jinja2==3.1.4",
"chardet==5.2.0",
# to support possible brotli content in warcs, must be added separately # to support possible brotli content in warcs, must be added separately
"brotlipy==0.7.0", "brotlipy==0.7.0",
"cdxj_indexer==1.4.5", "cdxj_indexer==1.4.5",

18
src/warc2zim/content_rewriting/generic.py
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@ -63,6 +63,7 @@ class Rewriter:
existing_zim_paths: set[ZimPath], existing_zim_paths: set[ZimPath],
missing_zim_paths: set[ZimPath] | None, missing_zim_paths: set[ZimPath] | None,
js_modules: set[ZimPath], js_modules: set[ZimPath],
charsets_to_try: list[str],
): ):
self.content = get_record_content(record) self.content = get_record_content(record)
@ -78,24 +79,11 @@ class Rewriter:
self.rewrite_mode = self.get_rewrite_mode(record, mimetype) self.rewrite_mode = self.get_rewrite_mode(record, mimetype)
self.js_modules = js_modules self.js_modules = js_modules
self.charsets_to_try = charsets_to_try
@property @property
def content_str(self) -> str: def content_str(self) -> str:
try: return to_string(self.content, self.encoding, self.charsets_to_try)
result = to_string(self.content, self.encoding)
if self.encoding and result.encoding and result.encoding != self.encoding:
logger.warning(
f"Encoding issue, '{result.encoding}' has been used instead of "
f"'{self.encoding}' to decode content of '{self.orig_url_str}'"
)
if result.chars_ignored:
logger.warning(
"Encoding issue, some chars had to be ignored to properly decode "
f"content of '{self.orig_url_str}' with '{result.encoding}'"
)
return result.value
except ValueError as e:
raise RuntimeError(f"Impossible to decode item {self.path.value}") from e
def rewrite( def rewrite(
self, pre_head_template: Template, post_head_template: Template self, pre_head_template: Template, post_head_template: Template

4
src/warc2zim/converter.py
View file

@ -192,6 +192,9 @@ class Converter:
self.redirections: dict[ZimPath, ZimPath] = {} self.redirections: dict[ZimPath, ZimPath] = {}
self.missing_zim_paths: set[ZimPath] | None = set() if args.verbose else None self.missing_zim_paths: set[ZimPath] | None = set() if args.verbose else None
self.js_modules: set[ZimPath] = set() self.js_modules: set[ZimPath] = set()
self.charsets_to_try: list[str] = [
charset_to_try.strip() for charset_to_try in args.charsets_to_try.split(",")
]
# progress file handling # progress file handling
self.stats_filename = ( self.stats_filename = (
@ -747,6 +750,7 @@ class Converter:
self.expected_zim_items, self.expected_zim_items,
self.missing_zim_paths, self.missing_zim_paths,
self.js_modules, self.js_modules,
self.charsets_to_try,
) )
if len(payload_item.content) != 0: if len(payload_item.content) != 0:

8
src/warc2zim/items.py
View file

@ -33,13 +33,19 @@ class WARCPayloadItem(StaticItem):
existing_zim_paths: set[ZimPath], existing_zim_paths: set[ZimPath],
missing_zim_paths: set[ZimPath] | None, missing_zim_paths: set[ZimPath] | None,
js_modules: set[ZimPath], js_modules: set[ZimPath],
charsets_to_try: list[str],
): ):
super().__init__() super().__init__()
self.path = path.value self.path = path.value
self.mimetype = get_record_mime_type(record) self.mimetype = get_record_mime_type(record)
(self.title, self.content) = Rewriter( (self.title, self.content) = Rewriter(
path, record, existing_zim_paths, missing_zim_paths, js_modules path,
record,
existing_zim_paths,
missing_zim_paths,
js_modules,
charsets_to_try,
).rewrite(pre_head_template, post_head_template) ).rewrite(pre_head_template, post_head_template)
def get_hints(self): def get_hints(self):

8
src/warc2zim/main.py
View file

@ -110,6 +110,14 @@ def main(raw_args=None):
dest="disable_metadata_checks", dest="disable_metadata_checks",
) )
parser.add_argument(
"--charsets-to-try",
help="List of charsets to try decode content when charset is not defined at "
"document or HTTP level. Single string, values separated by a comma. Default: "
"UTF-8,ISO-8859-1",
default="UTF-8,ISO-8859-1",
)
args = parser.parse_args(args=raw_args) args = parser.parse_args(args=raw_args)
converter = Converter(args) converter = Converter(args)
return converter.run() return converter.run()

100
src/warc2zim/utils.py
View file

@ -5,9 +5,7 @@ from __future__ import annotations
import re import re
from http import HTTPStatus from http import HTTPStatus
from typing import NamedTuple
import chardet
from bs4 import BeautifulSoup from bs4 import BeautifulSoup
from warcio.recordloader import ArcWarcRecord from warcio.recordloader import ArcWarcRecord
@ -19,12 +17,6 @@ ENCODING_RE = re.compile(
) )
class StringConversionResult(NamedTuple):
value: str
encoding: str | None
chars_ignored: bool
def get_version(): def get_version():
return __version__ return __version__
@ -132,84 +124,58 @@ def get_record_encoding(record: ArcWarcRecord) -> str | None:
return m.group("encoding") return m.group("encoding")
def to_string(input_: str | bytes, encoding: str | None) -> StringConversionResult: def to_string(
input_: str | bytes, http_encoding: str | None, charsets_to_try: list[str]
) -> str:
""" """
Decode content to string, trying to be the more tolerant possible to invalid Decode content to string based on charset declared in content or fallback.
declared encoding.
This try to decode the content using 3 methods: This method tries to not be smarter than necessary.
- From http headers in the warc record (given as `encoding` argument)
- From encoding declaration inside the content (hopping that content can be
losely decode using ascii to something usable)
- From statistical analysis of the content (made by chardet)
If all these methods fails, try again with the encoding passed via http headers but First, it tries to find an charset declaration inside the first bytes of the content
ignore all unrecognized characters. (hopping that content first bytes can be losely decoded using few known encoding to
something usable). If found, it is used to decode and any bad character is
automatically replaced, assuming document editor is right.
Returns the decoded content, the encoding used (or None if the input was already Second, if no charset declaration has been found in content, it uses the charset
decoded) and a boolean indicating wether unrecognized characters had to been ignored declared in HTTP `Content-Type` header. This is passed to this method as
or not. `http_encoding` argument. If present, it is used to decode and any bad character is
automatically replaced, assuming web server is right.
Finally, we fallback to use `charsets_to_try` argument, which is a list of charsets
to try. Each charset is tried in order, but any bad character found is raising an
error. If none of these charsets achieves to decode the content, an exception is
raised.
Returns the decoded content.
""" """
http_encoding = encoding
tried_encodings: set[str] = set()
if isinstance(input_, str): if isinstance(input_, str):
return StringConversionResult(input_, None, False) return input_
if not input_: if not input_:
# Empty bytes are easy to decode # Empty bytes are easy to decode
return StringConversionResult("", None, False) return ""
if encoding:
try:
return StringConversionResult(input_.decode(encoding), encoding, False)
except (ValueError, LookupError):
tried_encodings.add(encoding)
pass
# Search for encoding from content first bytes based on regexp # Search for encoding from content first bytes based on regexp
content_start = input_[:1024].decode("ascii", errors="replace") for encoding in ["ascii", "utf-16", "utf-32"]:
if m := ENCODING_RE.search(content_start): content_start = input_[:1024].decode(encoding, errors="replace")
encoding = m.group("encoding") if m := ENCODING_RE.search(content_start):
if encoding and encoding not in tried_encodings: head_encoding = m.group("encoding")
try: return input_.decode(head_encoding, errors="replace")
return StringConversionResult(input_.decode(encoding), encoding, False)
except (ValueError, LookupError):
tried_encodings.add(encoding)
pass
# Try to detect the most probable encoding with chardet (and only most probable
# one, since otherwise we will likely find an encoding which pass but produces only
# garbage with most characters badly decoded just due to a wrongly encoded character
# see https://github.com/openzim/warc2zim/issues/221)
# Nota: we use the detect_all method of chardet even if we are interesting only in
# the most probable encoding, because (as-of chardet 5.2.0 at least) the detect
# chardet method seems to be more naive, and detect_all gives better results in our
# tests
chardet_encodings = chardet.detect_all(input_)
if len(chardet_encodings):
chardet_encoding = chardet_encodings[0]["encoding"]
if chardet_encoding and chardet_encoding not in tried_encodings:
try:
return StringConversionResult(
input_.decode(chardet_encoding), chardet_encoding, False
)
except (ValueError, LookupError):
tried_encodings.add(chardet_encoding)
pass
# Try again encoding detected by chardet (most probable one), but this time ignore
# all bad chars
if http_encoding: if http_encoding:
return input_.decode(http_encoding, errors="replace")
# Try all charsets_to_try passed
for charset_to_try in charsets_to_try:
try: try:
return StringConversionResult( return input_.decode(charset_to_try)
input_.decode(http_encoding, errors="ignore"), http_encoding, True
)
except (ValueError, LookupError): except (ValueError, LookupError):
pass pass
raise ValueError(f"Impossible to decode content {input_[:200]}") raise ValueError(f"No suitable charset found to decode content {input_[:200]}")
def get_record_content(record: ArcWarcRecord): def get_record_content(record: ArcWarcRecord):

87
tests/encodings/definition.json Normal file
View file

@ -0,0 +1,87 @@
{
"files": [
{
"filename": "file01.js",
"source": "https://www.marxists.org/espanol/menu.js",
"date": "2024-06",
"probable_charset": "ISO-8859-1",
"expected_strings": [
"Afanásiev, Víktor",
"Andrópov, Yuri",
"Amaguaña, Tránsito",
"Cunhal, Álvaro",
"De la Cruz, Juana Inés",
"Faure, Sèbastien"
]
},
{
"filename": "file02.js",
"source": "https://www.cloudflare.com/vendor/onetrust/scripttemplates/202308.2.0/otBannerSdk.js",
"date": "2024-06",
"probable_charset": "UTF-8",
"expected_strings": [
"_Container:\"#ot-ven-lst\",P_Ven_Bx:\"ot-ven-box\",P_Ven_Name:\".ot-ven-name\"",
"ist,IabType:e.IabType,InactiveText:e.InactiveText,IsConsentLoggingEnabled:e.IsConsentLoggingEnabl",
"0;\\n transition: visibility 0s \"+e+\"ms, opacity \"+e+\"ms linear;\\n \",!0);var",
"r.prototype.escapeRegExp=function(e){return e.replace(/[-/\\\\^$*+?.()|[\\]{}]/g,\"\\\\$&\")}"
]
},
{
"filename": "file03.html",
"source": "https://www.solidarite-numerique.fr/tutoriels/comprendre-les-cookies/?thematique=internet",
"date": "2024-06",
"probable_charset": "UTF-8",
"contains_bad_chars": true,
"expected_strings": [
"Vous souhaitez changer de navigateur et utiliser Firefox ? Ce tutoriel vous détaille la procédure d'installation et la configuration pour une premi<6D>..."
]
},
{
"filename": "file04.js",
"source": "https://static.mailerlite.com/js/w/ml_jQuery.inputmask.bundle.min.js?v3.3.1",
"date": "2024-06",
"probable_charset": "ascii",
"expected_strings": [
"1,this.isOptional=b||!1,this.isQuantifier=c||!1,this.isAlterna",
"is;if(na=!1,g.clearMaskOnLostFocus&&document.activeElement!==b){var c=x().slice(),d=b.inputmask._v"
]
},
{
"filename": "file05.js",
"source": "https://static.sketchfab.com/static/builds/web/dist/ac0f732c4fc1a30c77920d75c1a9be83-v2.js",
"date": "2024-06",
"probable_charset": "ascii",
"expected_strings": [
"isTickUsed||(this._isTickUsed=!0,this._schedule(this.drainQueues))},s.prototype._reset=function(){this._is"
]
},
{
"filename": "file06.html",
"source": "https://website.test.openzim.org/chinese-encoding.html",
"date": "2024-06",
"known_charset": "gb2312",
"expected_strings": [
"simplified chinese characters: 汉字"
]
},
{
"filename": "file07.html",
"source": "https://website.test.openzim.org/chinese-encoding.html without <meta> header",
"date": "2024-06",
"known_charset": "gb2312",
"http_charset": "gb2312",
"expected_strings": [
"simplified chinese characters: 汉字"
]
},
{
"filename": "file08.js",
"source": "https://community.mozilla.org/wp-content/plugins/events-manager/includes/js/events-manager.min.js?ver=6.4.1",
"date": "2024-06",
"probable_charset": "UTF-8",
"expected_strings": [
"t Array]\"===Object.prototype.toString.call(e)},s={a:\"[aḀḁĂăÂâǍǎȺⱥȦȧẠạÄäÀàÁáĀāÃãÅåąĄÃąĄ]\",b:\"[b␢β"
]
}
]
}

438
tests/encodings/file01.js Normal file
View file

@ -0,0 +1,438 @@
function selectaplace(form) {
var appname= navigator.appName;
var appversion=parseInt(navigator.appVersion);
if (appname == "Netscape" && appversion >= 3) {
var formindex=form.select1.selectedIndex;
var storage=form.select1.options[formindex].text;
if (form.select1.options[formindex].value != "none") {
var msg=storage+"You are now being transferred to the -> "+storage;
for (var spot=0;spot<msg.length-storage.length;spot++) {
var x=msg.substring(spot,msg.length);
form.select1.options[formindex].text=x;
for(var d=0;d<150;d++) { };
}
window.location=form.select1.options[formindex].value;
form.select1[formindex].text=storage;
} else {
form.select1[formindex].text="Not a real option!";
for(var d=0;d<1250;d++) { };
form.select1[formindex].text=storage;
}
}
else {
var formindex=form.select1.selectedIndex;
window.location=form.select1.options[formindex].value;
}
}
function makeMyMenu() {
document.write ('<table align=center border=0><tr>');
document.write ('<td>');
document.write ('<form><select name="select1" onChange="selectaplace(this.form)" size=1>');
document.write ('<option value="">Escoja el autor que desea leer:');
document.write ('<option value="tematica/palestina/index.htm">Abu Nimah, Hasan');
document.write ('<option value="tematica/palestina/index.htm">Abunimah, Ali');
document.write ('<option value="adler-max/index.htm">Adler, Max');
document.write ('<option value="adorno/index.htm">Adorno, Theodor');
document.write ('<option value="tematica/mujer/autores/arianzen/index.htm">Arianzen, Catalina');
document.write ('<option value="afanasiev/index.htm">Afanásiev, Víktor');
document.write ('<option value="aldred/index.htm">Aldred, Guy');
document.write ('<option value="alia/index.htm">Alia, Ramiz');
document.write ('<option value="althusser/index.htm">Althusser, Louis');
document.write ('<option value="alvarado/index.htm">Alvarado, Huberto');
document.write ('<option value="andropov/index.htm">Andrópov, Yuri');
document.write ('<option value="arismendi/index.htm">Arismendi, Rodney');
document.write ('<option value="armand/index.htm">Armand, Inessa');
document.write ('<option value="allende/index.htm">Allende, Salvador');
document.write ('<option value="amaguana/index.htm">Amaguaña, Tránsito');
document.write ('<option value="tematica/mujer/amar/index.htm">Amar y Borbón, Josepha');
document.write ('<option value="andrade/index.htm">Andrade, Juan');
document.write ('<option value="andropov/index.htm">Andrópov, Yuri');
document.write ('<option value="arafat/index.htm">Arafat, Yasser');
document.write ('<option value="tematica/elsalvador/tamba/index.htm">Aragón Cabrera, Carlos Francisco');
document.write ('<option value="tematica/mujer/autores/arenal/index.htm">Arenal, Concepción');
document.write ('<option value="tematica/cienpol/index.htm">Aristoteles');
document.write ('<option value="ave-lallemant/index.htm">Avé-Lallemant, Germán');
document.write ('<option value="tematica/mujer/autores/baader/index.htm">Baader, Ottilie');
document.write ('<option value="babeuf/index.htm">Babeuf, Gracchus');
document.write ('<option value="bajtin/index.htm">Bajtin, Mijail');
document.write ('<option value="bakunin/index.htm">Bakunin, Mikhail');
document.write ('<option value="barbusse/index.htm">Barbusse, Henri');
document.write ('<option value="batkis/index.htm">Batkis, Grigorii');
document.write ('<option value="begino/index.htm">Begino, Juana María');
document.write ('<option value="berdyaev/index.htm">Berdyaev, Nikolai');
document.write ('<option value="beslay/index.htm">Beslay, Charles');
document.write ('<option value="bebel/index.htm">Bebel, Auguste');
document.write ('<option value="argala/index.htm">Beñaran Ordeñana, José');
document.write ('<option value="tematica/mujer/autores/berkins/index.htm">Berkins, Lohana');
document.write ('<option value="berkman/index.htm">Berkman, Alexander');
document.write ('<option value="besteiro/index.htm">Besteiro, Julián');
document.write ('<option value="bilbao/index.htm">Bilbao, Esteban');
document.write ('<option value="bland/index.htm">Bland, Bill');
document.write ('<option value="blanqui/index.htm">Blanqui, Auguste');
document.write ('<option value="bloch/index.htm">Bloch, Ernst');
document.write ('<option value="bogdanov/index.htm">Bogdánov, Aleksandr');
document.write ('<option value="bordiga/index.htm">Bordiga, Amadeo');
document.write ('<option value="borojov/index.htm">Borojov, Dov Ber');
document.write ('<option value="bortenstein/index.htm">Bortenstein, Mieczyslaw');
document.write ('<option value="tematica/india/index.htm#bose">Bose, Subhas Chandra');
document.write ('<option value="brendel/index.htm">Brendel, Cajo');
document.write ('<option value="breton/index.htm">Breton, André');
document.write ('<option value="brezhnev/index.htm">Brezhnev, Leonid');
document.write ('<option value="broue/index.htm">Broué, Pierre');
document.write ('<option value="brust/index.htm">Brust, Joachim');
document.write ('<option value="bujarin/index.htm">Bujarin, Nicolas');
document.write ('<option value="burnham/index.htm">Burnham, James');
document.write ('<option value="cacuango/index.htm">Cacuango, Dolores');
document.write ('<option value="cannon/index.htm">Cannon, James P.');
document.write ('<option value="tematica/mujer/autores/campoamor/index.htm">Campoamor, Clara');
document.write ('<option value="tematica/elsalvador/cardenal/index.htm">Cardenal Caldera, Antonio');
document.write ('<option value="tematica/elsalvador/carpio/index.htm">Carpio, Salvador Cayetano');
document.write ('<option value="castoriadis/index.htm">Castoriadis, Cornelius');
document.write ('<option value="castro/index.htm">Castro, Fidel');
document.write ('<option value="caudwell/index.htm">Caudwell, Christopher');
document.write ('<option value="ceausescu/index.htm">Ceau&#351;escu, Nicolae');
document.write ('<option value="cerpa/index.htm">Cerpa Cartolini, Néstor');
document.write ('<option value="cliff/index.htm">Cliff, Tony');
document.write ('<option value="codovilla/index.htm">Codovilla, Victorio');
document.write ('<option value="cooke/index.htm">Cooke, John William');
document.write ('<option value="cornu/index.htm">Cornu, Auguste');
document.write ('<option value="corvalan/index.htm">Corvalán, Luis');
document.write ('<option value="tematica/mujer/autores/cristobal/opresion_y_lucha_de_la_mujer_trabajadora.pdf">Cristóbal, Olga');
document.write ('<option value="tematica/guerrilla/uruguay/mln/cultelli/index.htm">Cultelli, Andrés');
document.write ('<option value="cunhal/index.htm">Cunhal, Álvaro');
document.write ('<option value="cunow/index.htm">Cunow, Heinrich');
document.write ('<option value="chavez/index.htm">Chávez, Hugo');
document.write ('<option value="checa/index.htm">Checa, Pedro');
document.write ('<option value="chen/index.htm">Chen Boda');
document.write ('<option value="chen_duxiu/index.htm">Chen Duxiu');
document.write ('<option value="chen_yun/index.htm">Chen Yun');
document.write ('<option value="chernenko/index.htm">Chernenko, Konstantín');
document.write ('<option value="chernyshevski/index.htm">Chernyshevski, Nikolai');
document.write ('<option value="chernin/index.htm">Chernin, Rose');
document.write ('<option value="tematica/elsalvador/chicas/index.htm">Chicas, Eugenio');
document.write ('<option value="chicherin/index.htm">Chicherin, Georgi V.');
document.write ('<option value="tematica/elsalvador/dalton/index.htm">Dalton, Roque');
document.write ('<option value="damen/index.htm">Damen, Onorato');
document.write ('<option value="darwin/index.htm">Darwin, Charles');
document.write ('<option value="tematica/mujer/autores/datri/index.htm">DAtri, Andrea');
document.write ('<option value="tematica/mujer/autores/davis/index.htm">Davis, Angela Y.');
document.write ('<option value="debs/index.htm">Debs, Eugene');
document.write ('<option value="deng/index.htm">Deng Xiaoping');
document.write ('<option value="tematica/mujer/autores/index.htm">De la Cruz, Juana Inés');
document.write ('<option value="delapuente/index.htm">De la Puente Uceda, Luís');
document.write ('<option value="delprado/index.htm">del Prado, Jorge');
document.write ('<option value="deutsch/index.htm">Deutsch, Leo');
document.write ('<option value="deutscher/index.htm">Deutscher, Isaac');
document.write ('<option value="deville/index.htm">Deville, Gabriel');
document.write ('<option value="di_bartolomeo/index.htm">di Bartolomeo, Nicola');
document.write ('<option value="diaz_martinez/index.htm">Díaz Martínez, Antonio');
document.write ('<option value="diaz/index.htm">Díaz Ramos, José');
document.write ('<option value="dickmann/index.htm">Dickmann, Enrique');
document.write ('<option value="dimitrov/index.htm">Dimitrov, Jorge');
document.write ('<option value="tematica/mujer/autores/dixon/index.htm">Dixon, Marlene');
document.write ('<option value="dobbs/index.htm">Dobbs, Farrell');
document.write ('<option value="drabkina/index.htm">Drabkina, Elisaveta');
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<h2 id="a-quoi-sert-un-cookie">À quoi sert un cookie ?</h2>
<p><strong>4 types de cookies les plus courants</strong> :</p>
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<li><strong>Nécessaires </strong>: pour le bon fonctionnement du site Internet. Ils <strong>conservent des données pour simplifier votre navigation</strong>. Par exemple, les sites les utilisent pour mémoriser le panier sur un site de commerce en ligne ou pour authentifier directement l'internaute. <strong>Ils sont nécessaires au bon fonctionnement d'un site Internet. </strong>Ils personnalisent également l'expérience de l'utilisateur sur un site Internet, en mémorisant ses préférences (sans consentement).</li>
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<h3>Depuis le navigateur Internet</h3>
<p>Les navigateurs Internet permettent de paramétrer le pistage des sites Internet :</p>
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<li><strong>Microsoft Edge :</strong> cliquez sur <strong>Paramètres</strong> &gt;<strong> Cookies et autorisations de site </strong>&gt;<strong> Gérer et supprimer les cookies et les données du site</strong></li>
<li><strong>Google Chrome : </strong>cliquez sur <strong>Paramètres </strong>&gt;<strong> Confidentialité et sécurité </strong>&gt;<strong> Cookies et autres données des sites</strong></li>
<li><strong>Mozilla Firefox : </strong>dans les <strong>Paramètres </strong>&gt;<strong> Vie privée et sécurité </strong>&gt;<strong> Protection renforcée contre le pistage</strong>, ainsi que <strong>Cookies et données de site</strong></li>
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<li><em>Le paramétrage au niveau du navigateur bloque les cookies techniques nécessaires au bon fonctionnement des sites Internet : cette configuration doit être effectué avec prudence.<br />
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<div class="tags"><p><a href="https://www.cnil.fr/fr/definition/cookie" target="_blank" rel="noopener">Définition des cookies par la CNIL</a></p>
<p><a href="https://www.cnil.fr/fr/cookies-et-traceurs-que-dit-la-loi" target="_blank" rel="noopener">Cookies et traceurs : que dit la loi ?</a></p>
<p><a href="https://www.numerama.com/tech/701279-payer-pour-eviter-les-cookies-publicitaires-est-ce-legal.html" target="_blank" rel="noopener">Payer pour éviter les cookies publicitaires, est-ce légal ?</a></p>
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<h5>Licence</h5>
<p class="licence"> <em>Ce tutoriel est mis à disposition sous les termes de la Licence Ouverte 2.0 (ou cc by SA) Ce tutoriel a été produit dans le cadre du projet Solidarité Numérique. L’objectif est d’accompagner les citoyens dans leurs besoins numériques. Tous les éléments reproduits dans les captures d’écran sont la propriété des sites desquels ils sont tirés.</em></p>
<p class="date-pub"><em>Dernière modification : 17 septembre 2021</em></p>
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10
tests/encodings/file04.js Normal file
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2
tests/encodings/file05.js Normal file
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27
tests/encodings/file06.html Normal file
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@ -0,0 +1,27 @@
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="gb2312">
<title>Test website</title>
<link rel="apple-touch-icon" sizes="180x180" href="./icons/apple-touch-icon.png">
<link rel="icon" type="image/png" sizes="32x32" href="./icons/favicon-32x32.png">
<link rel="icon" type="image/png" sizes="16x16" href="./icons/favicon-16x16.png">
<link rel="manifest" href="./icons/site.webmanifest">
<link rel="shortcut icon" href="./icons/favicon.ico">
<link rel="stylesheet" href="./css-broken-file.css">
</head>
<body>
<h2>Chinese encoding</h2>
<p>
<img src="http://www.mediaelementjs.com/images/big_buck_bunny.jpg">
</p>
<p>This file has been encoded with Simplified Chinese gb2312 encoding and simplified chinese characters: ºº×Ö.</p>
</body>
</html>

26
tests/encodings/file07.html Normal file
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@ -0,0 +1,26 @@
<!DOCTYPE html>
<html lang="en">
<head>
<title>Test website</title>
<link rel="apple-touch-icon" sizes="180x180" href="./icons/apple-touch-icon.png">
<link rel="icon" type="image/png" sizes="32x32" href="./icons/favicon-32x32.png">
<link rel="icon" type="image/png" sizes="16x16" href="./icons/favicon-16x16.png">
<link rel="manifest" href="./icons/site.webmanifest">
<link rel="shortcut icon" href="./icons/favicon.ico">
<link rel="stylesheet" href="./css-broken-file.css">
</head>
<body>
<h2>Chinese encoding</h2>
<p>
<img src="http://www.mediaelementjs.com/images/big_buck_bunny.jpg">
</p>
<p>This file has been encoded with Simplified Chinese gb2312 encoding and simplified chinese characters: ºº×Ö.</p>
</body>
</html>

11
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1
tests/test_rewriting.py
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@ -38,6 +38,7 @@ def rewrite_generator():
set(), set(),
set(), set(),
set(), set(),
["UTF-8", "ISO-8859-1"],
).rewrite(Template(""), Template("")) ).rewrite(Template(""), Template(""))
yield generate_and_call yield generate_and_call

274
tests/test_utils.py
View file

@ -1,4 +1,7 @@
import json
from collections.abc import Generator
from dataclasses import dataclass from dataclasses import dataclass
from pathlib import Path
import pytest import pytest
@ -25,7 +28,9 @@ class EncodedForTest:
@pytest.fixture( @pytest.fixture(
params=[ params=[
"Simple ascii content", "Simple ascii content",
"A content with non ascii char éœo€ð", "A content with non ascii chars éœo€ð",
"Latin1 contént",
"Latin2 conteňt",
"这是中文文本", # "This is a chinese text" (in chinese) "这是中文文本", # "This is a chinese text" (in chinese)
] ]
) )
@ -40,6 +45,7 @@ def content(request):
"utf-16", "utf-16",
"utf-32", "utf-32",
"latin1", "latin1",
"latin2",
"gb2312", "gb2312",
"gbk", "gbk",
] ]
@ -53,192 +59,38 @@ def simple_encoded_content(content, encoding):
return EncodedForTest(content, encoding) return EncodedForTest(content, encoding)
def test_decode(simple_encoded_content): def test_decode_http_header(simple_encoded_content):
if not simple_encoded_content.valid: if not simple_encoded_content.valid:
# Nothing to test # Nothing to test
return return
result = to_string(simple_encoded_content.encoded, None) assert (
assert result.value == simple_encoded_content.content to_string(simple_encoded_content.encoded, simple_encoded_content.encoding, [])
assert result.encoding == simple_encoded_content.content
assert not result.chars_ignored )
@pytest.fixture(
params=[
"ascii",
"utf-8",
"utf-16",
"utf-32",
"latin1",
"gb2312",
"gbk",
"wrong-encoding",
]
)
def declared_encoding(request):
return request.param
# This is a set of content/encoding/decoding that we know to fail.
# For exemple, the content "Simple ascii content" encoded using ascii, can be decoded
# by utf-16. However, it doesn't mean that it decoded it correctly.
# In this case, "utf-16" decoded it as "...."
# And this combination is not only based on the tuple encoding/decoding.
# The content itself may inpact if we can decode the bytes, and so if we try heuristics
# or not. No real choice to maintain a dict of untestable configuration.
FAILING_DECODE_COMBINATION = {
# Encodings/decodings failing for simple ascii content
"Simple ascii content": {
# Decoding failing for simple ascii content encoded in ascii
"ascii": ["utf-16"],
# Decoding failing for simple ascii content encoded in utf-8
"utf-8": [
"utf-16",
"utf-32",
"gb2312",
"gbk",
],
"utf-16": ["latin1"],
"utf-32": ["utf-16", "latin1"],
"latin1": ["utf-16"],
"gb2312": ["utf-16"],
"gbk": ["utf-16"],
},
"A content with non ascii char éœo€ð": {
"ascii": [],
"utf-8": ["utf-16", "latin1"],
"utf-16": ["latin1"],
"utf-32": ["utf-16", "latin1"],
"latin1": [],
"gb2312": [],
"gbk": [],
},
"这是中文文本": {
"ascii": [],
"utf-8": ["utf-16", "latin1"],
"utf-16": ["latin1"],
"utf-32": ["utf-16", "latin1"],
"latin1": [],
"gb2312": ["utf-16", "latin1"],
"gbk": ["utf-16", "latin1"],
},
}
@dataclass @dataclass
class DeclaredEncodedForTest(EncodedForTest): class DeclaredHtmlEncodedForTest(EncodedForTest):
declared_encoding: str def __init__(self, content: str, encoding: str):
correct: bool html_content = f'<html><meta charset="{encoding}"><body>{content}</body></html>'
super().__init__(html_content, encoding)
def __init__(self, content: str, encoding: str, declared_encoding: str):
super().__init__(content, encoding)
self.declared_encoding = declared_encoding
self.correct = self.valid
if (
self.valid
and content in FAILING_DECODE_COMBINATION
and declared_encoding in FAILING_DECODE_COMBINATION[content][encoding]
):
self.correct = False
@pytest.fixture @pytest.fixture
def declared_encoded_content(content, encoding, declared_encoding): def declared_html_encoded_content(content, encoding):
return DeclaredEncodedForTest(content, encoding, declared_encoding) return DeclaredHtmlEncodedForTest(content, encoding)
def test_declared_decode(declared_encoded_content): def test_decode_html_header(declared_html_encoded_content):
test_case = declared_encoded_content
if not test_case.valid:
return
result = to_string(test_case.encoded, test_case.declared_encoding)
if test_case.correct:
assert result.value == test_case.content
assert result.encoding
assert not result.chars_ignored
# This is a set of content/encoding/decoding that we know to fail.
# For exemple, the content "Simple ascii content" encoded using ascii, can be decoded
# by utf-16. However, it doesn't mean that it decoded it correctly.
# In this case, "utf-16" decoded it as "...."
# And this combination is not only based on the tuple encoding/decoding.
# The content itself may inpact if we can decode the bytes, and so if we try heuristics
# or not. No real choice to maintain a dict of untestable configuration.
FAILING_DECODE_HTML_COMBINATION = {
# All encoding/declared_encodingcoding failing for simple ascii content
"Simple ascii content": {
"ascii": [],
"utf-8": [],
"utf-16": [],
"utf-32": [],
"latin1": [],
"gb2312": [],
"gbk": [],
},
"A content with non ascii char éœo€ð": {
"ascii": [],
"utf-8": ["latin1"],
"utf-16": [],
"utf-32": [],
"latin1": [],
"gb2312": [],
"gbk": [],
},
"这是中文文本": {
"ascii": [],
"utf-8": ["latin1"],
"utf-16": [],
"utf-32": [],
"latin1": [],
"gb2312": ["latin1"],
"gbk": ["latin1"],
},
}
@dataclass
class DeclaredHtmlEncodedForTest(DeclaredEncodedForTest):
declared_encoding: str
correct: bool
def __init__(self, content: str, encoding: str, declared_encoding: str):
html_content = (
f'<html><meta charset="{declared_encoding}"><body>{content}</body></html>'
)
super().__init__(html_content, encoding, declared_encoding)
self.correct = self.valid
if (
self.valid
and declared_encoding in FAILING_DECODE_HTML_COMBINATION[content][encoding]
):
self.correct = False
@pytest.fixture
def declared_html_encoded_content(content, encoding, declared_encoding):
return DeclaredHtmlEncodedForTest(content, encoding, declared_encoding)
def test_declared_decode_html(declared_html_encoded_content):
test_case = declared_html_encoded_content test_case = declared_html_encoded_content
if not test_case.valid: if not test_case.valid:
return return
assert to_string(test_case.encoded, None, []) == test_case.content
result = to_string(test_case.encoded, None)
if test_case.correct:
assert result.value == test_case.content
assert result.encoding
assert not result.chars_ignored
def test_decode_str(content, declared_encoding): def test_decode_str(content, encoding):
result = to_string(content, declared_encoding) result = to_string(content, encoding, [])
assert result.value == content assert result == content
assert result.encoding is None
assert not result.chars_ignored
def test_binary_content(): def test_binary_content():
@ -246,21 +98,77 @@ def test_binary_content():
content = bytes([0xEF, 0xBB, 0xBF]) + content content = bytes([0xEF, 0xBB, 0xBF]) + content
# [0xEF, 0xBB, 0xBF] is a BOM marker for utf-8 # [0xEF, 0xBB, 0xBF] is a BOM marker for utf-8
# It will trick chardet to be really confident it is utf-8. # It will trick chardet to be really confident it is utf-8.
# However, this cannot be decoded using utf-8 # However, this cannot be properly decoded using utf-8 ; but a value is still
with pytest.raises(ValueError): # returned, since upstream server promised this is utf-8
assert to_string(content, None) assert to_string(content, "UTF-8", [])
# Make coverage pass on code avoiding us to try the same encoding twice
result = to_string(content, "UTF-8-SIG")
assert result.encoding == "UTF-8-SIG"
assert result.chars_ignored
def test_single_bad_character(): def test_single_bad_character():
content = bytes([0xEF, 0xBB, 0xBF]) + b"prem" + bytes([0xC3]) + "ière".encode() content = bytes([0xEF, 0xBB, 0xBF]) + b"prem" + bytes([0xC3]) + "ière".encode()
# [0xEF, 0xBB, 0xBF] is a BOM marker for utf-8-sig # [0xEF, 0xBB, 0xBF] is a BOM marker for utf-8-sig
# 0xC3 is a bad character (nothing in utf-8-sig at this position) # 0xC3 is a bad character (nothing in utf-8-sig at this position)
result = to_string(content, "utf-8-sig") result = to_string(content, "utf-8-sig", [])
assert result.value == "première" assert result == "prem<EFBFBD>ière"
assert result.encoding == "utf-8-sig"
assert result.chars_ignored
def test_decode_charset_to_try(simple_encoded_content):
if not simple_encoded_content.valid:
# Nothing to test
return
assert (
to_string(
simple_encoded_content.encoded, None, [simple_encoded_content.encoding]
)
== simple_encoded_content.content
)
def test_decode_weird_encoding_not_declared_not_in_try_list():
with pytest.raises(ValueError):
to_string("Latin1 contént".encode("latin1"), None, ["UTF-8"])
def test_decode_weird_encoding_not_declared_in_try_list():
content = "Latin1 contént"
assert to_string(content.encode("latin1"), None, ["UTF-8", "latin1"]) == content
@dataclass
class CharsetsTestData:
filename: str
probable_charset: str | None # probable charset to use
known_charset: str | None # charset we know is being used (fake file typically)
http_charset: (
str | None
) # encoding to pass as http header because file is missing details and encoding is
# not standard
expected_strings: list[str]
def get_testdata() -> Generator[CharsetsTestData, None, None]:
data = json.loads(
(Path(__file__).parent / "encodings" / "definition.json").read_bytes()
)
for file in data["files"]:
yield CharsetsTestData(
filename=file["filename"],
probable_charset=file.get("probable_charset", None),
known_charset=file.get("known_charset", None),
http_charset=file.get("http_charset", None),
expected_strings=file.get("expected_strings", []),
)
def get_testdata_id(test_data: CharsetsTestData) -> str:
return test_data.filename
@pytest.mark.parametrize("testdata", get_testdata(), ids=get_testdata_id)
def test_decode_files(testdata: CharsetsTestData):
result = to_string(
(Path(__file__).parent / "encodings" / testdata.filename).read_bytes(),
testdata.http_charset,
["UTF-8", "latin1"],
)
for expected_string in testdata.expected_strings:
assert expected_string in result