flutter_secure_storageとAndroidバックアップの注意点

potatotips #86 iOS / Android開発Tips共有会 の登壇資料です。
https://potatotips.connpass.com/event/307311/

資料の概要です。
- flutter_secure_storage パッケージ の概要
- flutter_secure_storage を利用する際のAndroid バックアップ機能の注意点

Transcript

1. flutter_secure_storageͱ AndroidόοΫΞοϓͷ஫ҙ఺ potatotips #86 iOS / Android։ൃTipsڞ༗ձ 2024/02/07 
 ෢౻׮
2. ࣗݾ঺հ • ෢౻׮ (mthiroshi) • ΤΩαΠτגࣜձࣾ • ϨγϐαΠτʮEɾϨγϐʯΛ୲౰ • X (چTwitter) ΞΧ΢ϯτɿmthiroshi_4o
3. ྉཧͷϓϩ͕࡞Δ؆୯ϨγϐαΠτ
 ʮEɾϨγϐʯ • Web, iOS, AndroidͰఏڙ • 2023೥10݄ʹ iOS / Android ωΠςΟϒ
 ͔Β Flutter ʹϦϓϨʔε ◦ ΤΩαΠτͰ͸ Flutter ϦϓϨʔεΛ
 ਪਐத
4. flutter_secure_storage ύοέʔδ • ΞϓϦ಺ͷσʔλΛ҉߸Խͯ҆͠શʹอଘ͢ΔͨΊͷϓϥάΠϯ • Android ͸ SharedPreference ʹ҉߸Խͯ͠อଘ͞ΕΔ • iOS ͸ KeyChain ʹอଘ͞ΕΔ • EɾϨγϐͰ͸ɺAPIͷΞΫηετʔΫϯͷอଘʹར༻
5. import 'package:flutter_secure_storage/flutter_secure_storage.dart'; // Create storage final storage = new FlutterSecureStorage(); // Read value String value = await storage.read(key: key); // Read all values Map<String, String> allValues = await storage.readAll(); // Delete value await storage.delete(key: key); // Delete all await storage.deleteAll(); // Write value await storage.write(key: key, value: value); Ҿ༻:https://pub.dev/packages/flutter_secure_storage#getting-started
6. ϋϚͬͨ໰୊ • Ϣʔβʔ͔Βෆ۩߹ใࠂ 
 ʮػछมߋΛͨ͠ΒΞϓϦ͕ىಈͰ͖ͳ͘ͳͬͨɻʯ
7. PlatformException(Exception encountered, read, javax.crypto.BadPaddingException: error:1e000065:Cipher functions:OPENSSL_internal:BAD_DECRYPT at com.android.org.conscrypt.NativeCrypto.EVP_CipherFinal_ex(Native Method) at com.android.org.conscrypt.OpenSSLEvpCipher.doFinalInternal(OpenSSLEvpCipher.java:15 2) at com.android.org.conscrypt.OpenSSLCipher.engineDoFinal(OpenSSLCipher.java:374) at javax.crypto.Cipher.doFinal(Cipher.java:2056) at l7.h.b(Unknown Source:35) at k7.a.c(Unknown Source:11) at k7.a.k(Unknown Source:17) at k7.e$b.run(Unknown Source:232) at android.os.Handler.handleCallback(Handler.java:942) at android.os.Handler.dispatchMessage(Handler.java:99) at android.os.Looper.loopOnce(Looper.java:346) at android.os.Looper.loop(Looper.java:475) at android.os.HandlerThread.run(HandlerThread.java:67) , null)
8. https://github.com/mogol/flutter_secure_storage/issues/541
9. Issue ͔ΒΘ͔ͬͨ͜ͱ • Android ͷόοΫΞοϓػೳ͸ɺσʔλΛ҉߸Խͯ͠όοΫΞοϓ • ҉߸Խʹ࢖ΘΕΔʮ҉߸ԽΩʔʯͷ࢓༷ ◦ ୺຤಺ͷΈͰ࢖ΘΕΔʢ࿙ӮରࡦͱࢥΘΕΔʣ ◦ ΞϓϦΛ࠶Πϯετʔϧͨ͠৔߹ʹ৽͘͠ੜ੒ • IssueͷέʔεͰ͸ɺόοΫΞοϓσʔλΛ෮ݩ͢Δࡍʹɺ৽͘͠ੜ੒͞Εͨ ҉߸ԽΩʔΛ࢖ͬͨͨΊྫ֎͕ى͖Δɻ
11. Issue ͔ΒΘ͔ͬͨ͜ͱ • Android ͷόοΫΞοϓػೳ͸ɺσʔλΛ҉߸Խͯ͠όοΫΞοϓ • ҉߸Խʹ࢖ΘΕΔʮ҉߸ԽΩʔʯͷ࢓༷ ◦ ୺຤಺ͷΈͰ࢖ΘΕΔʢ࿙ӮରࡦͱࢥΘΕΔʣ ◦ ΞϓϦΛ࠶Πϯετʔϧͨ͠৔߹ʹ৽͘͠ੜ੒ • IssueͷέʔεͰ͸ɺόοΫΞοϓσʔλΛ෮ݩ͢Δࡍʹɺ৽͘͠ੜ੒͞Εͨ ҉߸ԽΩʔΛ࢖ͬͨͨΊྫ֎͕ى͖Δɻ
12. ࠓճͷෆ۩߹ͷܦҢ • APIͷΞΫηετʔΫϯΛSecureStorageʹอଘ • ػछมߋͷࡍʹɺAndroidͷόοΫΞοϓػೳʹΑͬͯɺ৽୺຤ʹ҉߸Խ 
 ͞ΕͨΞΫηετʔΫϯ͕Ҡߦ • ৽୺຤Ͱ͸ɺ҉߸Խʹ࢖ΘΕͨ΋ͷͰ͸ͳ͍҉߸ԽΩʔʹΑͬͯ෮߸ԽΛ 
 ࢼΈͨͨΊྫ֎͕ൃੜ
13. ෆ۩߹ͷղܾํ๏ • ΞΫηετʔΫϯΛ SecureStorage ͔Βऔಘ͢Δ࣌ʹྫ֎͕ى͖ͨ৔߹͸ɺ ΞΫηετʔΫϯΛ࠶ൃߦ • Android ͷόοΫΞοϓػೳͷઃఆʹ flutter_secure_storage Λআ֎͢Δઃఆ Λ௥Ճ
14. <!-- AndroidManifet.xml -- > <application android:name="${applicationName}" <!-- όοΫΞοϓઃఆ௥Ճ --> android:fullBackupContent="@xml/backup_rules" android:icon="@mipmap/ic_launcher" android:label="@string/app_name"> <!-- backup_rules.xml -- > <?xml version="1.0" encoding="utf-8"?> <full-backup-content> <exclude domain="sharedpref" path="FlutterSecureStorage" /> <exclude domain="sharedpref" path="FlutterSecureKeyStorage" /> </full-backup-content>
15. ·ͱΊ • flutter_secure_storage ◦ σʔλΛ҉߸Խͯ͠อଘ͢ΔϓϥάΠϯ ◦ Android όοΫΞοϓػೳ͔Βআ֎͢Δ • flutter_secure_storage ͷ࢓༷ɺѻ͏σʔλͷಛੑΛߟྀͯ͠ઃܭ΍࣮૷Λ 
 ͢Δ