{"id":104458,"date":"2022-06-21T03:36:39","date_gmt":"2022-06-21T01:36:39","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/opublikovan-instrumentarij-dlya-opredeleniya-dopolnenij-ustanovlennyh-v-chrome"},"modified":"2022-06-21T03:36:39","modified_gmt":"2022-06-21T01:36:39","slug":"opublikovan-instrumentarij-dlya-opredeleniya-dopolnenij-ustanovlennyh-v-chrome","status":"publish","type":"post","link":"https:\/\/prohoster.info\/et\/blog\/news\/opublikovan-instrumentarij-dlya-opredeleniya-dopolnenij-ustanovlennyh-v-chrome","title":{"rendered":"Avaldatud on t\u00f6\u00f6riistad Chrome'i installitud lisaosade m\u00e4\u00e4ramiseks.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Avalikustatud on t\u00f6\u00f6riistakomplekt, mis rakendab meetodit Chrome'i brauserisse installitud laiendite m\u00e4\u00e4ramiseks. Saadud laiendite loendit saab kasutada konkreetse brauseri eksemplari passiivse tuvastamise t\u00e4psuse suurendamiseks, koos teiste kaudsete tunnustega, nagu ekraani resolutsioon, WebGL-i omadused, installitud pluginade ja fondide loendid. Ettepanekuline rakendus kontrollib enam kui 1000 laiendi installimist. Oma s\u00fcsteemi kontrollimiseks on saadaval online-demo. <\/p>\n

Laiendite m\u00e4\u00e4ramine toimub l\u00e4bi anal\u00fc\u00fcsides laiendite pakutavaid ressursse, mis on v\u00e4liste p\u00e4ringute jaoks saadaval. \u00dcldjuhul sisaldavad laiendid erinevaid kaasaegseid faile, nagu n\u00e4iteks pildid, mis m\u00e4\u00e4ratakse laiendi manifestis omadusega web_accessible_resources. Manifesti esimeses versioonis ei olnud ressursside juurde p\u00e4\u00e4s piiratud ja iga sait sai pakkuda pakutavaid ressursse. Teises versioonis oli juurdep\u00e4\u00e4s sarnastele ressurssidele vaikimisi lubatud ainult laiendile endale. Manifesti kolmandas versioonis anti v\u00f5imalus m\u00e4\u00e4rata, milliseid ressursse v\u00f5ivad jagada millised laiendid, domeenid ja lehed. <\/p>\n

Veebilehed saavad laiendis pakutavaid ressursse p\u00e4rida fetch meetodi abil (n\u00e4iteks \u2018fetch(\u2018chrome-extension:\/\/okb\u2026nd5\/test.png\u2019)\u2019), mille tagasiandmine v\u00e4\u00e4rtus \u2018false\u2019 viitab tavaliselt sellele, et laiend ei ole installitud. Ressursside olemasolu m\u00e4\u00e4ramise blokeerimiseks genereerivad m\u00f5ned laiendid kontrolltokeni, mis on vajalik ressursi juurde p\u00e4\u00e4semiseks. Fetchi kutse ilma tokenita l\u00f5peb alati eba\u00f5nnestumisega. <\/p>\n

Selgus, et laiendite ressursside juurdep\u00e4\u00e4su kaitset on v\u00f5imalik k\u00f5rvale hiilida tegevuse t\u00e4itmise aja hindamise kaudu. Kuigi fetch toob p\u00e4ringu puhul ilma tokenita alati vea, erineb operatsiooni t\u00e4itmise aeg laiendi olemasolul ja puudumisel - kui laiend on kohal, vajab p\u00e4ring rohkem aega kui juhul, kui laiend ei ole installitud. Reaktsiooniaja hindamisel on v\u00f5imalik \u00fcsna t\u00e4pselt m\u00e4\u00e4rata, kas laiend on olemas. <\/p>\n

M\u00f5ningaid laiendusi, mis ei h\u00f5lma v\u00e4ljastpoolt ligip\u00e4\u00e4setavaid ressursse, saab tuvastada t\u00e4iendavate omaduste kaudu. N\u00e4iteks laiendust MetaMask saab tuvastada, kontrollides omaduse window.ethereum olemasolu (kui laiendust ei ole installitud, tagastab «typeof window.ethereum» v\u00e4\u00e4rtuse «undefined»).
\n
Allikas: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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[…]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-104458","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47Avaldatud on t\u00f6\u00f6riistade komplekt Chrome'is installitud lisade m\u00e4\u00e4ramiseks | ProHoster","description":"Avaldatud on t\u00f6\u00f6riistakomplekt Chrome'i brauserisse installitud laiendite m\u00e4\u00e4ratlemise meetodi 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