On-chain ENS Domain Normalization

raffy · June 26, 2022, 8:26am

Here is an initial version of an efficient emoji parser library that should be a drop-in for your contract.

I deployed a contract using it here and populated it.

It requires less than 1 eth in gas to deploy and supports all Unicode 14 emoji. (If the upload mechanism is exposed, it’s also upgradeable, but since it’s so cheap, its probably better to seal it and redeploy for future Unicode updates.)

function read(Emoji storage self, uint24[] memory cps, uint256 pos, bool skipFE0F) returns (uint256) — will return the length of the next emoji token, if it exists. If skipFE0F is true, it will effectively ignore FE0F (but it will also return a non-zero result for a run of FE0F's without any emoji.)
function filter(Emoji storage self, uint24[] memory cps, bool skipFE0F) returns (uint24[]) — will replace emoji tokens with a single 0xFFFFFF.

If you use as a library, you’ll need to call upload() with the following 10KB payload, broken into (2) chunks:

Chunk 1

0x000026F901010001F3C301010001F3C401010001F3CA01010001F3CB01010001F3CC01010001F46E01010001F47001010001F47101010001F47301010001F47701010001F48101010001F48201010001F48601010001F48701010001F57501010001F64501010001F64601010001F64701010001F64B01010001F64D01010001F64E01010001F6A301010001F6B401010001F6B501010001F6B601010001F92601010001F93501010001F93701010001F93801010001F93901010001F93C01010001F93D01010001F93E01010001F9B801010001F9B901010001F9CD01010001F9CE01010001F9CF01010001F9D401010001F9D601010001F9D701010001F9D801010001F9D901010001F9DA01010001F9DB01010001F9DC01010001F9DD01010100200D00020200264002030200264202030101F3FB01040101F3FC01040101F3FD01040101F3FE01040101F3FF01040400200D00020000276401050500200D00060601F52502030601FA7902030001F3F301070700200D0008080026A702030801F30802030001F3F401090900200D000A0A0026200203090E0067000B0B0E0062000C0C0E0065000D0D0E006E000E0E0E0067000F0F0E007F06100C0E00730011110E00630012120E0074000F0C0E00770013130E006C0014140E0073000F0001F40801151500200D001616002B1B02030001F41501171700200D00181801F9BA02030001F43B01191900200D001A1A00274402030001F441011B1B00200D001C1C01F5E802030001F468011D1D00200D001E1E00269502031E00269602031E00270802031E01F33E02031E01F37302031E01F37C02031E01F39302031E01F3A402031E01F3A802031E01F3EB02031E01F3ED02031E01F4BB02031E01F4BC02031E01F52702031E01F52C02031E01F68002031E01F69202031E01F9AF02031E01F9B002031E01F9B102031E01F9B202031E01F9B302031E01F9BC02031E01F9BD02031E01F466021F1F00200D00202001F46602031E01F46702212100200D00222201F46602032201F46702031E00276400232300200D00242401F46804252401F48B00262600200D00272701F46806101E01F46800281E01F46900282800200D00292901F466042A2A00200D00202901F467042B2B00200D00221D01F3FB412C1D01F3FC412C1D01F3FD412C1D01F3FE412C1D01F3FF412C2C00200D002D2D00269502032D00269602032D00270802032D01F33E02032D01F37302032D01F37C02032D01F39302032D01F3A402032D01F3A802032D01F3EB02032D01F3ED02032D01F4BB02032D01F4BC02032D01F52702032D01F52C02032D01F68002032D01F69202032D01F9AF02032D01F9B002032D01F9B102032D01F9B202032D01F9B302032D01F9BC02032D01F9BD02032D01F91D002E2E00200D002F2F01F46800303001F3FB85313001F3FC85313001F3FD85313001F3FE85313001F3FF85312D00276400323200200D00333301F46800343401F3FB05313401F3FC05313401F3FD05313401F3FE05313401F3FF05313301F48B00353500200D00363601F46800373701F3FB07383701F3FC07383701F3FD07383701F3FE07383701F3FF07380001F46901393900200D003A3A00269502033A00269602033A00270802033A01F33E02033A01F37302033A01F37C02033A01F39302033A01F3A402033A01F3A802033A01F3EB02033A01F3ED02033A01F4BB02033A01F4BC02033A01F52702033A01F52C02033A01F68002033A01F69202033A01F9AF02033A01F9B002033A01F9B102033A01F9B202033A01F9B302033A01F9BC02033A01F9BD02033A01F466021F3A01F46702213A002764003B3B00200D003C3C01F46804253C01F46904253C01F48B003D3D00200D003E3E01F46806103E01F46906103A01F46900283901F3FB413F3901F3FC413F3901F3FD413F3901F3FE413F3901F3FF413F3F00200D00404000269502034000269602034000270802034001F33E02034001F37302034001F37C02034001F39302034001F3A402034001F3A802034001F3EB02034001F3ED02034001F4BB02034001F4BC02034001F52702034001F52C02034001F68002034001F69202034001F9AF02034001F9B002034001F9B102034001F9B202034001F9B302034001F9BC02034001F9BD02034001F91D00414100200D00424201F46800304201F46900304000276400434300200D00444401F46800344401F46900344401F48B00454500200D00464601F46800374601F46900370001F46F01474700200D00024701F3FB01484701F3FC01484701F3FD01484701F3FE01484701F3FF01480001F62E01494900200D004A4A01F4A802030001F635014B4B00200D004C4C01F4AB02030001F636014D4D00200D004E4E01F32B02030001F9D1014F4F00200D00505000269502035000269602035000270802035001F33E02035001F37302035001F37C02035001F38402035001F39302035001F3A402035001F3A802035001F3EB02035001F3ED02035001F4BB02035001F4BC02035001F52702035001F52C02035001F68002035001F69202035001F9AF02035001F9B002035001F9B102035001F9B202035001F9B302035001F9BC02035001F9BD02035001F91D00515100200D00525201F9D104254F01F3FB41534F01F3FC41534F01F3FD41534F01F3FE41534F01F3FF41535300200D00545400269502035400269602035400270802035401F33E02035401F37302035401F37C02035401F38402035401F39302035401F3A402035401F3A802035401F3EB02035401F3ED02035401F4BB02035401F4BC02035401F52702035401F52C02035401F68002035401F69202035401F9AF02035401F9B002035401F9B102035401F9B202035401F9B302035401F9BC02035401F9BD02035400276400555500200D00565601F9D100305601F48B00575700200D00585801F9D100595901F3FB87385901F3FC87385901F3FD87385901F3FE87385901F3FF87385401F91D005A5A00200D005B5B01F9D100340001F9DE01040001F9DF01040001FAF1015C5C01F3FB415D5C01F3FC415D5C01F3FD415D5C01F3FE415D5C01F3FF415D5D00200D005E5E01FAF2005F5F01F3FB83605F01F3FC83605F01F3FD83605F01F3FE83605F01F3FF8360000000A90148000000AE01480000203C0148000020490148000021940148000021950148000021960148000021970148000021980148000021990148000021A90148000021AA01480000231A01480000231B0148000023280148000023CF0148000023E90148000023EA0148000023EB0148000023EC0148000023ED0148000023EE0148000023EF0148000023F00148000023F10148000023F20148000023F30148000023F80148000023F90148000023FA0148000025AA0148000025AB0148000025B60148000025C00148000025FB0148000025FC0148000025FD0148000025FE0148000026000148000026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Chunk 2

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The chunks are 6 byte rules for state transitions which follow this tree:

Here is a test contract that I’ve set the above contract as the emoji parser and a BasicValidator contract that implements /^[a-z09-_.]+/$ as the validator.

filter(string name, bool ignoreFEOF) should parse any UTF8 string with emojis.
validate(string name) should validate any normalized name which uses valid emoji or obeys the regex above. Note: This will fail if emoji have FE0F (which isn’t normalized). This should validate 94% of registered names as-of today.