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July 18, 2023 11:59
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Convert from Instagram Shortcode to Id and Back using big-integer
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var bigint = require( 'big-integer' ) | |
var lower = 'abcdefghijklmnopqrstuvwxyz'; | |
var upper = lower.toUpperCase(); | |
var numbers = '0123456789' | |
var ig_alphabet = upper + lower + numbers + '-_' | |
var bigint_alphabet = numbers + lower | |
function toShortcode( longid ) | |
{ | |
var o = bigint( longid ).toString( 64 ) | |
return o.replace(/<(\d+)>|(\w)/g, (m,m1,m2) => | |
{ | |
return ig_alphabet.charAt( ( m1 ) | |
? parseInt( m1 ) | |
: bigint_alphabet.indexOf( m2 ) ) | |
}); | |
} | |
function fromShortcode( shortcode ) | |
{ | |
var o = shortcode.replace( /\S/g, m => | |
{ | |
var c = ig_alphabet.indexOf( m ) | |
var b = bigint_alphabet.charAt( c ) | |
return ( b != "" ) ? b : `<${c}>` | |
} ) | |
return bigint( o, 64 ).toString( 10 ) | |
} | |
toShortcode( '908540701891980503' ) // s.b. 'ybyPRoQWzX' | |
fromShortcode( 'ybyPRoQWzX' ) // s.b. '908540701891980503' |
Same here. Spent 2 days trying to fix this basic conversion which FB could do it for us. It makes total sense.
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Same problem as pierrocknroll ^