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Cacheable Presigned URL with Cloudflare Workers
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oliver
October 06, 2023
Technology
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7.5k
Cacheable Presigned URL with Cloudflare Workers
2023年10月06日「Cloudflare Meetup Nagoya 第3回」にて発表した資料。
https://cfm-cts.connpass.com/event/294096/
oliver
October 06, 2023
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Transcript
Cloud fl are Meetup Nagoya ୈ3ճ Cacheable Presigned URL with
Cloudflare Workers 2023/10/06 oliver
ࣗݾհ • גࣜձࣾϢʔπʔςοΫʢද / ιϑτΣΞΤϯδχΞʣ • લલ৬ࠂ৴ɺલ৬Ϋϥυήʔϛϯά • Cloud fl
areલ͔Βͣͬͱ͔͚͍ͬͯΔ • ͱ͋ΔࣄͰେྔͷը૾৴ΛηΩϡΞͳঢ়ଶͰ৴͢Δٕज़͕ඞཁͱͳͬ ͍ͯΔʢͷͰɺࠓճͷLTͰݕূ݁ՌΛൃද͠Α͏ͱࢥͬͨʣ minakawadaiki.com
ը૾৴ʹCloudflareΛ બ͢Δ1൪ͷཧ༝
σʔλΤάϨεྉ͕ۚ 0ԁ͔ͩΒ https://www.cloud fl are.com/ja-jp/learning/cloud/what-are-data-egress-fees/
֎෦ʹஔ͔ΕͯΔը૾Λ CloudflareͰϓϩΩγ͢Δ
֎෦ʹஔ͔ΕͯΔը૾ΛCloudflareͰϓϩΩγ͢Δ • ύλʔϯ1ʢDNSΛCloud fl areͰཧͰ͖Δ߹ʣ • DNS ProxyΛઃఆͯ͋͛͠ΕOK • Ωϟογϡͤͨ͘͞ͳ͍ͷ·ͰΩϟογϡͤ͞ͳ͍Α͏ʹҙ
https://developers.cloud fl are.com/support/third-party-software/others/con fi guring-an-amazon-web-services-static-site-to-use-cloud fl are/
֎෦ʹஔ͔ΕͯΔը૾ΛCloudflareͰϓϩΩγ͢Δ • ύλʔϯ2ʢDNSΛCloud fl areͰཧͰ͖ͳ͍߹ʣ • Cloud fl are WorkersͰΩϟογϡͯ͋͛͠Δ
• Workersͷݺͼग़͠ྉ͕͔͔ۚΔͷͰҙ • 1͋ͨΓ10ສ݅ͷϦΫΤετ·Ͱແྉʢ202310݄6࣌ʣ • ϦΫΤετ100ສ݅͋ͨΓֹ݄0.15υϧʢ202310݄6࣌ʣ https://developers.cloud fl are.com/workers/examples/cache-api/
DNSΛCloudflareͰཧͰ͖ͳ͍߹ https://<workers-path>/image?src=https://<image-path>
Cloudflare্͚ͩͰը૾৴͢Δ
Cloudflare্͚ͩͰը૾৴͢Δ • ύλʔϯ̍ʢCloud fl are ImagesΛ͏ʣ • ը૾֨ೲ10ສ͋ͨΓ$5ʢ202310݄6࣌ʣ • ը૾৴10ສ͋ͨΓ$1ʢ202310݄6࣌ʣ
• ༷ʑͳը૾ૢ࡞ʢϦαΠζͳͲͷฤूʣ͕URLͰՄೳ • Workers + R2ͱൺͯগׂ͠ߴͳҹ https://www.cloud fl are.com/ja-jp/developer-platform/cloud fl are-images/
Cloudflare্͚ͩͰը૾৴͢Δ • ύλʔϯ̎ʢCloud fl are Workers + R2Λ͏ʣ • R2ͷྉۚʢಡΈऔΓʹ͔͔Δ෦͚ͩهࡌʣ
• ετϨʔδ: $0.015 / GB ετϨʔδ • ΫϥεBૢ࡞ɿطଘͷঢ়ଶΛಡΈऔΔ: $0.36 / 100ສ • ը૾ૢ࡞WorkersͰผ్՝ۚ͢ΕՄೳ https://developers.cloud fl are.com/r2/api/workers/workers-api-usage/
Cloudflare Workers + R2Λ͏ https://<workers-path>/< fi le-name>/with-cache ͜͜ͰΩϟογϡ͍ͤͯ͞Δ
ॺ໊͖URLͰը૾ΛकΔ
ॺ໊͖URLͰը૾ΛकΔ • Ϣʔεέʔε • ಛఆͷ৫ʹॴଐ͍ͯ͠Δਓ͚͔ͩ͠ݟΕͳ͍ը૾ • Notionͷը૾ͱ͔GitHubͷը૾ͱ͔ • ອըͳͲΛߪೖͯ͠ઐ༻ͷReaderͳͲͰಡΉ߹ •
kindleͱ͔ͦͷଞອըΞϓϦͱ͔ https://docs.aws.amazon.com/ja_jp/AmazonS3/latest/userguide/ShareObjectPreSignedURL.html
ॺ໊͖URLͰը૾ΛकΔ ᶃ ݖݶʹج͍ͮͯॺ໊͖URLΛൃߦ͢Δ ᶄ ॺ໊Λݕূ͠ը૾ΛϨεϙϯε ॺ໊͖URLൃߦαʔόʔ ը૾ετϨʔδ https://<domain>/<image-path>/verify?mac=<MAC>&expiry=<number>
WorkersͰ࣮͢Δ
WorkersͰ࣮͢ΔʢURLੜʣ https://developers.cloud fl are.com/workers/examples/signing-requests/ • `/:image/generate` ͰΞΫηεΛͪड͚Δ • generateSignedUrlؔͰ࡞ͨ͠ॺ໊͖URLΛΫϥΠΞϯτʹϨεϙϯε
WorkersͰ࣮͢ΔʢURLੜʣ https://developers.cloud fl are.com/workers/examples/signing-requests/ • Web Crypto API ͰΩʔΛੜ •
ΞϧΰϦζϜॺ໊͖URLͰΑ͘༻͍ΒΕΔ HMAC-SHA256Λ࠾༻ • HMACڞ௨伴҉߸ํࣜͳͷͰ ॺ໊ଆͱݕূଆͰಉ͡ΩʔΛ༻͍Δ • ॺ໊URLʹ࠷ݶඞཁͳใɺͦͷURLͷ༗ޮظݶͱΞΫ ηεൣғʢ ࠓճͰ͍͏ͱ `url.pathname` ʣͰ͋ΓɺͦΕΒ ΛؚΊͯॺ໊͍ͯ͠Δ • ॺ໊ͯ͠ੜ͞ΕͨMACΛURLʹؚΊΔͨΊBase64ʹม • `+`จࣈURLʹؚΊΔͱόάΛੜΉͨΊɺ `-` ʹม • URLͷQuery ParamsʹMACͱ༗ޮظݶʢexpiryʣΛ༩
WorkersͰ࣮͢Δʢը૾ΞΫηεʣ • ॺ໊͖URLʹ༩͞Ε͍ͯΔMAC ͱexpiryΛ༻͍ͯɺ`verifySignedUrl` ؔΛ࣮ߦʢৄࡉ࣍ϖʔδʣ • ʮॺ໊͕ਖ਼͍͠ʯ͔ͭʮͦͷॺ໊͕ ༗ޮظݶʯͰ͋Δ͔ΛνΣοΫ • R2͔Βը૾Λऔಘ͠ɺϨεϙϯε
https://developers.cloud fl are.com/workers/examples/signing-requests/
WorkersͰ࣮͢Δʢը૾ΞΫηεʣ • ݕূ༻ͷڞ௨伴Λ࡞͢Δ • URLͰड͚औͬͨMACΛBase64͔Βม • ॺ໊ʹར༻ͨ͠ ʮ`${url.pathname}@${expiry}`ʯΛੜ • ॺ໊Λݕূ
https://developers.cloud fl are.com/workers/examples/signing-requests/
Ωϟογϡ༗ແͰͷΛൺֱ͢Δ
R2 from Workers with no cache ntimes 10 -- curl
‘https://<worker-domain>/<image-path>/no-cache’ --compressed -o /dev/null -w "%{time_total}\n" -s | percentile
Presigned URL With R2 ntimes 10 -- curl ‘https://<r2-domain>.r2.cloud fl
arestorage.com/images/<image-name>?X-Amz-Expires=3600&X-Amz-Date=20231005T200233Z &X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=<credential> &X-Amz-SignedHeaders=host&X-Amz-Signature=<sig>’ --compressed -o /dev/null -w "%{time_total}\n" -s | percentile
R2 from Workers with cache ntimes 10 -- curl ‘https://<workers-domain>/<image-path>/with-cache’
--compressed -o /dev/null -w "%{time_total}\n" -s | percentile
Public bucket on R2 ntimes 10 -- curl ‘https://<public-r2-domain>/images/<image-name>’ --compressed
-o /dev/null -w "%{time_total}\n" -s | percentile
Λൺֱ͢Δʢ20MBͷը૾ʣ Workers with no cache Presigned URL Workers with cache
Public bucket 0 0.3 0.6 0.9 1.2 S S S S S
ຊ
Cacheable Presigned URL with Cloudflare Workers
ΩϟογϡՄೳͳॺ໊͖URL • ͳͥඞཁ͔ • R2ͱ͍͑ɺΩϟογϡ͞Εͯͳ͍ը૾Ϩεϙϯε͕͍ • R2ͷಡΈऔΓΑΓWorkersͷݺͼग़͠ͷํ͕ίετ • Βͳ͚Ε͍͚ͳ͍͜ͱ •
ॺ໊͖URLͷϩδοΫʹΩϟογϡॲཧΛՃ • ॺ໊͖URLΛ࡞͢ΔࡍͷexpireΛௐ͢Δ
ॺ໊͖URLͷϩδοΫʹΩϟογϡॲཧΛՃ • ॺ໊ͷݕূʹޭͨ࣌͠ʹΩϟογϡ͔ Βऔಘ͢ΔίʔυΛՃ • Ωϟογϡ͕ͳ͍߹R2͔Βը૾Λऔ ಘ͠Ϩεϙϯε͢Δ
ॺ໊͖URLΛ࡞͢ΔࡍͷexpireΛௐ͢Δ https://advancedweb.hu/cacheable-s3-signed-urls/
ॺ໊͖URLΛ࡞͢ΔࡍͷexpireΛௐ͢Δ • ࠓճ؆қతʹʮ࣍ͷX࣌0 + 10sʯ Λ༗ޮظݶͱͨ͠ॺ໊͖URLΛ ࡞͍ͯ͠Δ • ཁ͢Δʹ13࣌15ʹੜ͞ΕΔॺ໊URL ͱ13࣌59ʹੜ͞ΕΔॺ໊͖URL͕
ಉҰʹͳΔ͜ͱͰΩϟογϡ͞ΕΔΑ͏ ʹͳΔ
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