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安全なJavaScriptを書く
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Kohei Asai
December 15, 2015
Programming
22
8.2k
安全なJavaScriptを書く
SCRIPTY #4 on 2015-12-15
Kohei Asai
December 15, 2015
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Transcript
҆શͳJavaScriptΛॻ͘ @axross SCRIPTY #4 on 2015-12-15
whoami » @axross / Kohei Asai » Gunosy Inc. »
ωτήഇਓ -> հޢۀք -> Webۀք » SPAॻ͍͓ͯۚΒͬͯ·͢
ͨΓલͳ͜ͱΛ͠· ͢
ʮྫ֎ʯ
ྫ֎ʹର͢Δೝࣝ » Errorͷ͜ͱ » ྫ֎͕εϩʔ͞Εɺcatch͞Εͯͳ͍߹ɺ࣮ߦ͕ࢭ·Δ » ϓϩμΫγϣϯͰ࣮ߦ͕ࢭ·Δͱக໋త » ʮۃྗΤϥʔϋϯυϦϯά͠Α͏ʂʯͬͯؾ࣋ͪʹͳΔ͕...ʁ
None
27. ʮࢮ͵ͣͷϓϩάϥϜΛແཧʹ ੜ͔͓͍͍͚ͯͯ͠ͳ͍ʯ try-catch ϒϩοΫΛίʔυϕʔεʹେྔʹೖΕΕɺʮྫ֎͕ൃੜͯ͠ ઈରʹࢭ·Βͳ͍ʯͱ͍͏ΞϓϦέʔγϣϯΛ࡞Δ͜ͱ͕Մೳͳͣ Ͱ͢ɻ ͨͩɺ͜Εɺ͏ࢮΜͰ͍ΔਓͷମΛఝ͔Կ͔Ͱݻఆ͠ɺແཧཧ ཱͬͨঢ়ଶʹ͍ͯ͠ΔΑ͏ͳͷͰ͕͢......ɻ --
ΦϥΠϦʔɾδϟύϯʮϓϩάϥϚ͕Δ͖97ͷ͜ͱʯ
ແཧΓੜ͔͞ΕͨϓϩάϥϜ » ϓϩμΫγϣϯͰྫ֎͕throw͞ΕͯͳΒͳ͍ » ͳͥͳΒɺϓϩάϥϜͷ࣮ߦ͕ࢭ·ͬͯ͠·͏͔Β » Ͱɺͦͷྫ֎ԿʹΑΔͷͳͷ͔ʁ » ڥɾঢ়گʹΑͬͯൃੜͨ͠ͷʁ(HTTPݻ༗όάͳͲ) »
୯७ͳ։ൃऀͷϛεʹΑΔͷʁ » ͜ͷྫ֎ΛcatchͰ௵͢ͷϚζ͍Μ͡Όͳ͍ͩΖ͏͔ʁ
ߟ͑Δ͖͜ͱ » ਖ਼ৗͳಈ࡞Ͳ͏͍͏ܗͳͷ͔ʁ » ͕ؔҙਤ͠ͳ͍ҾΛͬͯݺΕͨΒʁ » ͜͜Λ༨ܭͳ͓ੈͰʹʮແࢹ͢Δʯͱ͔ͯ͠͠·͏ͱɺ։ൃ ऀͷਓతͳϛεڐ͢Մೳੑ͕͋Δ » ʮ͜͏͍͏έʔε͋Δ͔͠Εͳ͍ʯͱ͍͏ରԠΑ͘ͳ͍
» ʮ͍͚͋ͬͯͳ͍ɺ͔ͩΒྫ֎ͩʯ » ͜Ε͕ྫ֎ͷਖ਼͍͠ΘΕํͩͱࢥ͏
ʮؾ͔ͳ͍ʯํ͕ා͍ » ༏͗͢͠ΔAPI࡞Βͳ͍ » ʮArray͡Όͳͯ͘ड͚͚Δ෮ॲཧͷؔʯΛͲ͏ࢥ͏͔ʁ » νʔϜͰೝ͕ࣝ߹ͬͯΕ͍͍ » ͔͠͠ɺόάʹʮؾ͚ͳ͘ͳΔʯͷશʹବ »
σόοάςετόάΛݕग़͢ΔͨΊʹ͋Δ » ݕग़Ͱ͖ͳ͘ͳͬͯ͠·ͬͨΒɺͦΕʮ༏͍͠ʯͩΖ͏͔ʁ
Ͳ͏ͨ͠Β͍͍͔
throwΛා͕Γ͗͢ͳ͍ » throw͖͢ͷͪΌΜͱ͠Α͏ » ։ൃதʹྫ֎Λ౿ΊΕɺݕग़ͮ͠Β͍όάΛ༧ͨ͜͠ͱʹͳ Δ » ʮਖ਼ৗಈ࡞ͳΒى͜Δͣͷͳ͍throwʯා͕Γա͗ͳ͍͍ͯ͘ Α͏ͳʁ »
ແɺͪΌΜͱσόοάஈ֊Ͱݕग़͓ͯ͘͠ » Ϗδωεతͳສ͕Ұʹඋ͑ͯɺϦΧόϦʔͰ͖ΔΑ͏ʹ࡞Δ
assert / unassert » twada/unassert » ίʔυதͷassert()console.assert()Λআ͢Δͷ » throwͷΘΓʹassert()ΛͬͯɺAssertionErrorΛ͛Δ »
assert()ͳͲͷ෦͚͕ͩunassertʹΑͬͯআ͞ΕɺϓϩμΫ γϣϯ࣌ʹAssertionError͕ൃੜ͠ͳ͘ͳΔ » http://www.slideshare.net/t_wada/unassert
ΤϥʔΛऩू͢Δ » window.onerrorͰ΄΅શͯͷྫ֎ΛcatchͰ͖Δ » catchͨ͠ͷΛΤϥʔऩूαʔϏεʹ͛Δ » Sentry » Airbrake »
sourcemaps͕͋ΕಡԽޙͷίʔυղऍͯ͘͠ΕΔ » ͋Δ͍ɺGoogle AnalyticsʹஷΊΔ » ྫ֎Λऩूͯ͠ɺঢ়گݻ༗ݻ༗ͷόάΛݕग़͠Α͏
Lint͢Δ » eslintɺjshintɺjslint » ίʔυͷόουϓϥΫςΟεγϯλοΫεΤϥʔΛݕͯ͠ڭ͑ ͯ͘ΕΔ » ελϯεΛܾΊͯɺݫ͠Ίʹઃఆ͢Δɺ͖ͦͯͪ͠ΜͱकΔ » ਓతͳϛεΛ͍͘Β͔ݮͰ͖Δ
» ؇ΊΔͷةݥɺ؇ΊΔ߹͖ͪΜͱ͠߹͏ » ઃఆϑΝΠϧΛॻ͘͜ͱͰɺֶͼ͋Δ͔ʁ
ςετΛॻ͘ » ྫ֎ɺςετΛॻ͍ͯ։ൃதʹ͖ͪΜͱग़ձ͓ͬͯ͘ » ςετ͕େมͩͱײͨ͡ΒɺͦΕਓతϛε͕ى͖͍͢ͱ͍͏αΠ ϯ » ޙʑʹόάͷݪҼΛḷΔ͍͍ಓඪʹͳΔ » αϘͬͪΌବ!
ίʔυϨϏϡʔ͢Δ » Lintͯ͠ɺςετΛॻ͍ͯɺϛεΛ͢Δ͜ͱ͋Δ » ਓతͳϛεΛݟ͚ͭΒΕΔۀϑϩʔΛ͖ͪΜͱ࡞Ζ͏ » ϛεΛؾܰʹࢦఠͰ͖Δۭؾ࡞ΓΛ͠Α͏ » ϨϏϡʔͯ͠ίʔυΛڞ༗͓͚ͯ͠ɺଞͷਓ͕༨ܭͳϛεΛ͠ͳ͘ ͯࡁΉ
·ͱΊ » ʮͦͷྫ֎ຊʹѲΓ௵͍͍ͯ͠ͷͩΖ͏͔ʁʯ » ͦΕ͕ʮͲ͏͍͏ྫ֎ͳͷ͔ʯΛ͖ͪΜͱߟ͑Α͏ » JavaScriptΛॻ͘ྔ͕૿͖͑ͯͨ » ੲʮແཧΓੜ͖ͯΔJavaScriptʯ͕·Εͨ »
ࠓͦ͏Ͱͳ͍ɺJSͰΞϓϦέʔγϣϯΛߏங͢Δ » ৭ʑͳࡦΛଧͪɺ҆શͳJavaScriptΛॻ͜͏ʂ
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